JP6481942B2 - Power management system, power management method, and program - Google Patents

Description

  The present invention generally relates to a power management system, a power management method, and a program, and more specifically, a power management system and a power management method used in a power distribution system configured to allow a reverse power flow operation to reversely flow generated power to a power system. And related to the program.

  2. Description of the Related Art Conventionally, there is a power distribution system that combines power generated by a distributed power source such as a solar power generation device with a commercial power source, further stores the power in a storage battery, and supplies power from the commercial power source, the distributed power source, or the storage battery to the device (for example, Patent Document 1 ).

JP 2011-15501 A

  The power distribution system as described above is installed in a customer facility such as a detached dwelling unit, a housing complex, or a business office, and can sell power by causing the power generated by the distributed power source to flow backward in the power system.

  However, if the generated power is reversely flowed from each of a large number of customer facilities, the system voltage of the power system rises and the power system may become unstable. Therefore, in the power distribution system, when a voltage deviation state in which the system voltage exceeds the upper limit voltage occurs, reverse power flow (power sale) is stopped.

  This reverse power flow stop (power supply stop) is an economic loss because the user cannot obtain the profit that can be originally obtained by the power sale.

  The present invention has been made in view of the above reasons, and its purpose is to suppress the occurrence of reverse power flow stop by suppressing the system voltage from going into a voltage deviation state, and the power management method, and To provide a program.

  The power management system of the present invention is configured to be able to perform a reverse power flow operation that supplies commercial power supplied from a power system and power generated by a distributed power source to a load, and reversely flows the generated power to the power system. A power management system used in a power distribution system in which the reverse power flow operation stops when a voltage deviation state in which the system voltage of the power system exceeds the upper limit voltage, and a data acquisition unit that acquires data of the system voltage; Based on at least the system voltage acquired by the data acquisition unit, a level setting unit for setting any one of the risk levels from a plurality of risk levels corresponding to the risk of occurrence of the voltage deviation state, and depending on the set risk level And a risk management unit that transmits a control signal for controlling the device.

  The power management method of the present invention is configured to allow a reverse power flow operation in which commercial power supplied from a power system and power generated by a distributed power source are supplied to a load, and the generated power is reversely flowed to the power system, A power management method used in a power distribution system in which the reverse power flow operation stops when a voltage deviation state in which the system voltage of the power system exceeds an upper limit voltage, the data acquisition step of acquiring data of the system voltage; Based on at least the acquired grid voltage, a level setting step for setting one of the risk levels from a plurality of risk levels corresponding to the risk of occurrence of the voltage deviation state, and controlling the device according to the set risk level A risk management step of transmitting a control signal.

  The program of the present invention is configured to supply a commercial power supplied from an electric power system and a generated power of a distributed power source to a load, and to allow a reverse power flow operation to reversely flow the generated power to the power system. Is a program used in a power distribution system in which the reverse power flow operation stops when a voltage deviation state in which the system voltage exceeds the upper limit voltage occurs, and the computer includes a data acquisition unit that acquires data of the system voltage, and at least Based on the system voltage acquired by the data acquisition unit, from a plurality of risk levels according to the risk of occurrence of the voltage deviation state, a level setting unit that sets any risk level, and according to the set risk level It is made to function as a risk management part which transmits the control signal which controls an apparatus.

  As described above, according to the present invention, there is an effect that it is possible to suppress the occurrence of reverse power flow stop by suppressing the system voltage from being in a voltage deviation state.

It is a block diagram which shows the structure of the power distribution system with which the power management system of Embodiment 1 is used. FIG. 3 is a waveform diagram illustrating an example of system voltage control according to the first embodiment. It is a block diagram which shows the power management apparatus of the modification of Embodiment 1. It is a block diagram which shows the structure of the power distribution system with which the power management system of Embodiment 2 is used. 10 is a flowchart illustrating the operation of the second embodiment. 10 is a flowchart showing another operation of the second embodiment. It is a block diagram which shows the power management apparatus of the 1st modification of Embodiment 2. It is a block diagram which shows the power management apparatus of the 2nd modification of Embodiment 2.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 shows the overall configuration of the power distribution system. The power distribution system includes a power management device 1, a distribution board 2, a power conversion device 3, a solar cell 4, a power storage device 5, and an information terminal 6 as main components, and supplies power to a load 7. In FIG. 1, a solid line between components indicates a power path, and a broken line between components indicates a communication path. Moreover, although this embodiment demonstrates the form which applied the power distribution system to the detached dwelling unit, it cannot be overemphasized that a power distribution system may be applied to consumer facilities, such as an apartment house and a business establishment.

  The distribution board 2 is supplied with AC power (commercial power) from the commercial power supply 8 via the power system L <b> 1 and supplied with AC power from the power converter 3. The distribution board 2 is provided with a branch portion 21 including a main breaker, a plurality of branch breakers, a switch and the like in the panel. The distribution board 2 supplies AC power to the load 7 through a plurality of branch circuits L2 branched on the respective load sides of the plurality of branch breakers. Note that the load 7 in FIG. 1 is an electrical device such as a lighting device, an air conditioner, or an information device connected to the branch circuit.

  In addition, the distribution board 2 includes a voltage measurement unit 22 in the board. The voltage measuring unit 22 measures the system voltage of the power system L1 and generates system voltage measurement data. The voltage measurement unit 22 periodically generates measurement data, and generates measurement data at intervals of 1 minute, for example. The voltage measuring unit 22 is preferably attached to the main breaker in the distribution board 2, but may be provided outside the distribution board 2.

  In addition, the distribution board 2 includes a home communication unit 23. The in-home communication unit 23 functions as a communication interface that performs communication with the power management apparatus 1 and the power conversion apparatus 3.

  Further, the distribution board 2 includes a power measurement unit 24. The power measuring unit 24 can generate measurement data of each power such as a total demand power and a reverse power flow, which will be described later, by measuring the current of each part in the distribution board 2. The power measurement unit 24 regularly generates measurement data, and generates measurement data at intervals of 1 minute, for example. Then, the power measurement unit 24 periodically transmits power measurement data to the power management apparatus 1 via the home communication unit 23.

  The power conversion device 3 includes a home communication unit 31, a first power conversion unit 32, and a control unit 33. The in-home communication unit 31 functions as a communication interface that performs communication among the power management device 1, the distribution board 2, and the power storage device 5.

  The first power conversion unit 32 converts the DC power output from the solar cell 4 into AC power (generated power) and supplies it to the power system L1 through the distribution board 2. The first power conversion unit 32 has a function of adjusting the frequency and output voltage of the generated power to be output so that the grid connection with the power system L1 is possible. The generated power supplied to the power system L1 is supplied from the distribution board 2 to the load 7 through the branch circuit L2. Surplus power that is not consumed by the load 7 is sold by being reversely flowed through the power system L1 or used for charging a storage battery 53 described later in the power storage device 5.

  The control unit 33 controls each operation of the in-home communication unit 31 and the first power conversion unit 32. For example, the control unit 33 can control the operation of the first power conversion unit 32 to increase or decrease the generated power output by the first power conversion unit 32. Furthermore, the control unit 33 can acquire measurement data of the storage battery 53 at a state of charge (SOC), charging power, and discharging power from the power storage device 5. And the control part 33 can also transmit each measurement data of generated electric power, charging electric power, discharging electric power, and a charging rate from the in-home communication part 31 to the power management apparatus 1 via the distribution board 2. FIG.

  In the present embodiment, the first power conversion unit 32 and the solar battery 4 constitute a solar power generation device 40.

  The power storage device 5 includes a home communication unit 51, a second power conversion unit 52, and a storage battery 53. The in-home communication unit 51 functions as a communication interface that performs communication with the power conversion device 3.

  The second power conversion unit 52 has a function of charging and discharging the storage battery 53. Specifically, the second power conversion unit 52 converts the commercial power supplied from the distribution board 2 and the generated power of the solar power generation device 40 into DC power, and charges the storage battery 53. Further, the second power conversion unit 52 converts the DC power supplied from the storage battery 53 into AC power (discharge power) and supplies the AC power to the distribution board 2 via the power conversion device 3 to discharge the storage battery 53. . The discharged power is supplied to the power system L1 through the distribution board 2, and is supplied from the distribution board 2 to the load 7 through the branch circuit L2. Furthermore, the second power converter 52 has a function of adjusting the frequency and output voltage of the discharge power to be output so that the grid connection with the power system L1 is possible.

  The second power conversion unit 52 may be built in the power conversion device 3 so that the power conversion device 3 charges and discharges the storage battery 53.

  That is, the generated power of the solar power generation device 40 is used as any of the demand power consumed by the load 7, the charging power for charging the storage battery 53, and the reverse power flow flowing backward to the power system L1. Furthermore, the discharged power of the power storage device 5 is used as demand power.

  The power management apparatus 1 constitutes a power management system of the present embodiment. In addition, the power management system is a form constituted by a plurality of apparatuses in a customer facility, a form constituted by servers on a network, a cloud computer system, in addition to a form constituted by one power management apparatus 1. There are forms to be configured.

  Here, the power management apparatus 1 is preferably a HEMS (Home Energy Management System) controller. The power management apparatus 1 can monitor the operation state of the device and control the operation state of the device by communicating with the device. The devices here include not only the load 7 but also the power conversion device 3, the power storage device 5, and the information terminal 6. That is, by communicating with the power management apparatus 1, the device transmits an operation state to the power management apparatus 1 and receives an instruction from the power management apparatus 1.

  Any one of a personal computer, a tablet terminal, a smart phone, a mobile phone, a dedicated terminal, and the like is used as the information terminal 6, and a terminal capable of displaying various kinds of information and outputting sound by communicating with the power management apparatus 1 It is.

  When the power distribution system as described above is used in each of a large number of customer facilities and the generated power is caused to flow backward from each of the large number of customer facilities, the system voltage of the power system L1 rises and the power system L1 May become unstable. Therefore, in the power distribution system, when a voltage deviation state in which the system voltage exceeds the upper limit voltage occurs, reverse power flow (power sale) is stopped. This upper limit voltage is a value determined by laws and regulations, and is 107 V in this embodiment. The specific value of the upper limit voltage is not limited to 107V.

  Specifically, the control unit 33 of the power conversion device 3 acquires system voltage measurement data from the distribution board 2. And the control part 33 adjusts generated electric power so that reverse power flow electric power may not generate | occur | produce, if the voltage deviation state where a system voltage exceeds an upper limit voltage generate | occur | produces. That is, the generated power is adjusted so that the generated power is equal to or less than the total demand power (the total demand power consumed by each of the loads 7). The measurement data of the reverse power flow power is generated by, for example, the power measurement unit 24 of the distribution board 2. The control unit 33 acquires and uses the measurement data of the reverse flow power from the power measurement unit 24.

  However, this reverse power flow stop (power supply stop) is an economic loss because the user cannot obtain the profit that can be originally obtained by power sale.

  Therefore, in the present embodiment, the power management apparatus 1 performs the following power management control.

  The power management apparatus 1 includes a home communication unit 11, a data acquisition unit 12, a reference information storage unit 13, a level setting unit 14, a risk management unit 15, and a data storage unit 16.

  The in-home communication unit 11 functions as a communication interface that performs communication with the power conversion device 3.

  The communication methods among the power management device 1, the distribution board 2, the power conversion device 3, and the power storage device 5 are based on wireless communication using radio waves as transmission media, wired communication using power lines or dedicated lines as transmission media, and the like. Selected. The wireless communication specification is appropriately selected from a wireless local area network (LAN), a specific low power wireless station, Bluetooth (registered trademark), and the like, and the wired communication specification is appropriately selected from power line carrier communication, wired LAN, and the like. The For example, the ECHONET Lite (registered trademark) standard is used as an upper layer communication protocol in this communication, but the specific communication protocol is not limited.

  The data acquisition unit 12 periodically acquires system voltage measurement data from the distribution board 2, and acquires measurement data at intervals of 1 minute, for example. The system voltage measurement data acquired by the data acquisition unit 12 is stored in the data storage unit 16. That is, the data storage unit 16 stores a system voltage history.

  Further, the data acquisition unit 12 periodically acquires measurement data of each power such as total demand power and reverse power flow from the distribution board 2, and further generates generated power, charging power, discharging power, Each measurement data of charge rate is acquired regularly. The measurement data of each power is stored in the data storage unit 16. That is, each history such as total demand power, reverse power flow power, generated power, charging power, discharging power, and charging rate is also stored in the data storage unit 16.

  The level setting unit 14 collates the system voltage acquired by the data acquisition unit 12 with the reference information stored in the reference information storage unit 13 and sets the risk level. Here, the risk level is a level of risk (possibility) that a voltage deviation state occurs. In the present embodiment, the risk level is set to four levels of “0”, “1”, “2”, and “3”. . In the reference information, the system voltage is associated with each of the four risk levels. Table 1 shows an example of the table structure of the reference information.

  In this reference information, the risk level when the system voltage is less than 102 V is “0”, and there is no risk that a voltage deviation state occurs. When the system voltage is 102 V or more and less than 104 V, the risk level is “1” (first level). When the system voltage is 104 V or more and less than 106 V, the risk level is “2” (second level). When the system voltage is 106 V or more and less than 107 V, the risk level is “3” (third level). At risk level “1”, the risk of occurrence of a voltage deviation state is low, at risk level “2”, the risk of occurrence of a voltage deviation state is medium, and at risk level “3”, the voltage deviation state is The risk of occurrence is high. Further, when the system voltage becomes 107 V or higher, the power distribution system is stopped selling power.

  That is, the level setting unit 14 periodically sets the risk level of the voltage deviation state based on the system voltage acquired by the data acquisition unit 12 (for example, every minute). The range of the system voltage corresponding to each of the plurality of risk levels can be changed by a user operation or the like.

  The risk management unit 15 generates a control signal for controlling the device according to the risk level set by the level setting unit 14 and transmits the control signal via the in-home communication unit 11.

  Specifically, when the risk level is “0”, the risk management unit 15 determines that there is no risk that the voltage deviation state occurs, and does not execute the control signal generation process.

  Further, when the risk level is “1”, the risk management unit 15 determines that the risk of occurrence of the voltage deviation state is a low level and notifies the notice signal of the voltage deviation state (first control). Signal) to the information terminal 6. This notification signal is, for example, image data for displaying a message of caution information that “system voltage may deviate”, voice data of a message, or the like.

  The information terminal 6 that has received this notification signal displays the caution information and also outputs a sound if necessary. The user can take measures to suppress the voltage deviation state based on the caution information. For example, charging of the storage battery 53 can be started by instructing the control unit 33 of the power conversion device 3 by a user's manual operation. In this case, since the generated power of the solar power generation device 40 is used for the charging power, the risk of voltage deviation can be reduced by reducing the reverse power flow and suppressing the increase of the system voltage. Further, when the commercial power supplied from the distribution board 2 is used for charging, the demand viewed from the power system L1 increases, so that the increase of the system voltage is suppressed and the risk of the voltage deviation state is reduced. be able to.

  In addition, when the risk level is “2”, the risk management unit 15 determines that the risk of occurrence of the voltage deviation state is a medium level, and requests the user to charge the storage battery 53 (second signal). Control signal) is transmitted to the information terminal 6. This request signal is, for example, image data for displaying a message of advice information such as “system voltage deviates. Please perform storage battery charging control”, voice data of the message, and the like.

  The information terminal 6 that has received this request signal displays advice information, and also outputs a sound if necessary. The user can know a specific measure for suppressing the voltage deviation state from the advice information. Therefore, even a user who has no specialized knowledge can execute specific measures for reducing the risk of a voltage deviation state.

  Further, when the risk level is “3”, the risk management unit 15 determines that the risk that the voltage deviation state occurs is a high level. Then, the risk management unit 15 transmits a charge control signal (third control signal) for instructing the power storage device 5 to perform the charging operation for charging the storage battery 53 to the power conversion device 3. In the power conversion device 3, the control unit 33 instructs the power storage device 5 to execute charging control.

  In the power storage device 5 instructed to execute the charge control, the second power conversion unit 52 starts charging the storage battery 53. Therefore, even if a user does not perform manual operation, the charging operation of the storage battery 53 is automatically performed, so that the voltage deviation state can be automatically suppressed.

  Further, when the risk level is “3”, the risk management unit 15 transmits to the information terminal 6 a notification signal for notifying the user that the storage battery 53 is automatically charged. The notification signal is, for example, image data for displaying a message “charging control of the storage battery because the system voltage deviates”, voice data of the message, and the like.

  The information terminal 6 that has received this notification signal displays a message and also outputs a sound if necessary. The user can know that the charging control of the storage battery 53 is automatically executed.

  In addition, when the risk level is “3”, the risk management unit 15 can also add information on the charge rate of the storage battery 53 based on the magnitude of the system voltage to the charge control signal. Specifically, the risk management unit 15 uses a voltage difference that is a value obtained by subtracting a predetermined center voltage (for example, 101 V) from the system voltage acquired by the data acquisition unit 12. When the voltage difference is positive (that is, when the system voltage is higher than the center voltage), the risk management unit 15 increases the charging rate as the voltage difference increases, and decreases the charging rate as the voltage difference decreases.

  And the risk management part 15 transmits the charge control signal which added the information of this charge rate to the power converter device 3. FIG. The control unit 33 of the power conversion device 3 instructs the power storage device 5 to execute the charge control at the charge rate instructed from the risk management unit 15. In the power storage device 5 instructed to execute the charge control, the second power conversion unit 52 starts charging the storage battery 53 at the instructed charge rate. Therefore, since charge control is performed at an appropriate charge rate according to the voltage difference, the power management apparatus 1 can suppress oscillation of the system voltage due to charge control.

  In addition, when the voltage difference is negative (that is, when the system voltage is lower than the center voltage), the risk management unit 15 outputs a discharge control signal for instructing the power storage device 5 to execute the discharge operation for discharging the storage battery 53. , It may be transmitted to the power conversion device 3. In the power conversion device 3, the control unit 33 instructs the power storage device 5 to execute discharge control. In the power storage device 5 instructed to perform the discharge control, the second power conversion unit 52 starts discharging the storage battery 53.

  Therefore, when the demand for electric power increases and the supply and demand conditions become tight, and the grid voltage decreases, the storage battery 53 can be discharged and the discharged power can be supplied to the load 7. A decrease in voltage can be suppressed.

  Furthermore, when the voltage difference is negative, the risk management unit 15 may increase the discharge rate as the voltage difference increases, and decrease the discharge rate as the voltage difference decreases. In this case, the risk management unit 15 transmits a discharge control signal to which the information on the discharge rate is added to the power conversion device 3. The control unit 33 of the power conversion device 3 instructs the power storage device 5 to execute discharge control at the discharge rate instructed from the risk management unit 15. In the power storage device 5 instructed to execute the discharge control, the second power conversion unit 52 starts discharging the storage battery 53 at the instructed discharge rate. Therefore, since the discharge control is performed at an appropriate discharge rate corresponding to the voltage difference, the power management apparatus 1 can suppress the oscillation of the system voltage due to the discharge control.

  FIG. 2 is an example of system voltage control when the above-described charge control and discharge control are performed. The system voltage gradually approaches the center voltage 101V, and stabilization is achieved by suppressing oscillation of the system voltage. ing.

  Further, when the risk level is “3”, the risk management unit 15 of the power management apparatus 1 can control the operation of the load 7 in the direction in which the demand power increases in addition to the charging control of the storage battery 53. The risk management unit 15 transmits a control signal to the load 7. In this case, since the generated power of the solar power generation device 40 is used for the demand power of the load 7, the risk of a voltage deviation state can be reduced by reducing the reverse power flow and suppressing the increase of the system voltage. Further, when the commercial power supplied from the distribution board 2 is used for the demand power of the load 7, since the demand viewed from the power system L1 increases, the rise of the system voltage is suppressed, and the voltage deviation state Can reduce the risk.

  Next, a modification of this embodiment will be described. In the first modified example, the power management apparatus 1 further includes a stop period detection unit 17, a suppression power estimation unit 18, and a loss derivation unit 19, as shown in FIG.

  The power management apparatus 1 monitors the system voltage and performs device control according to the risk level of the voltage deviation state. However, even if the device control is executed, the system voltage may deviate and the power sale may be stopped. Therefore, in this embodiment, when the power sale is stopped, the loss due to the power sale stop is notified to the user.

  Specifically, it is assumed that a voltage deviation state occurs and the power sale is stopped. In this case, the control unit 33 of the power conversion device 3 notifies the power management device 1 via the distribution board 2 that the power sale is stopped. The stop period detection unit 17 of the power management apparatus 1 stores the start time of the power sale stop state (power sale stop time). After that, it is assumed that the voltage deviation state is canceled and the power sale is resumed. In this case, the control unit 33 of the power conversion device 3 notifies the power management device 1 via the distribution board 2 that power selling has been resumed. The stop period detection unit 17 stores the end time of the power sale stop state (power sale restart time).

  Then, the suppressed power estimation unit 18 reads the generated power and the total demand power immediately before the power sale stop time from the data storage unit 16, and subtracts the total demand power from the read generated power at the power sale stop time. Suppressed power. This suppressed power can be regarded as the generated power suppressed by the power conversion device 3 at the power sale stop time (or immediately after).

  Further, the suppressed power estimation unit 18 reads the generated power and the total demand power immediately after the power sale restart time from the data storage unit 16, and subtracts the total demand power from the read generated power at the power sale restart time. Suppressed power. This suppressed power can be regarded as generated power suppressed by the power conversion device 3 at the power sale restart time (or immediately before).

  The suppression power estimation unit 18 obtains an average value (suppression power average value) of the suppression power at the power sale stop time and the suppression power at the power sale restart time. Furthermore, the suppression power estimation unit 18 obtains the difference between the power sale stop time and the power sale start time as the time length of the power sale stop period. And the suppression power estimation part 18 calculates | requires the suppression electric energy during a power sale stop period by integrating the suppression power average value by the time length of a power sale stop period.

  The loss deriving unit 19 holds information on the power rate unit price in advance, and obtains the amount of loss due to the power sale suspension state from the suppressed power amount during the power sale suspension period and the information on the power rate unit price. Then, the loss deriving unit 19 transmits to the information terminal 6 a notification signal that notifies each information of the loss amount, the suppressed power amount, and the power sale suspension period.

  The information terminal 6 that has received this notification signal displays information on the amount of loss, the amount of restrained power, and the power sale suspension period, and also outputs a sound if necessary. The user can know the loss due to the suspension of power sale.

  That is, the above-described power management system (power management apparatus 1) is used in a power distribution system. The power distribution system can supply commercial power supplied from the power system L1 and generated power of the distributed power source (solar power generation device 40) to the load 7, and can perform a reverse power flow operation that reversely flows the generated power to the power system L1. It is configured. Further, in the power distribution system, the reverse power flow operation stops when a voltage deviation state occurs in which the system voltage of the power system L1 exceeds the upper limit voltage.

  The power management system includes a data acquisition unit 12, a level setting unit 14, and a risk management unit 15. The data acquisition unit 12 acquires system voltage data. The level setting unit 14 sets one of the risk levels from a plurality of risk levels according to the risk of occurrence of a voltage deviation state based on at least the system voltage acquired by the data acquisition unit 12. The risk management unit 15 transmits a control signal for controlling the devices (for example, the information terminal 6, the power conversion device 3, the power storage device 5, etc.) according to the set risk level.

  Therefore, the power management system can notify the user of attention, advice, etc. according to the risk of occurrence of the voltage deviation state, and can take measures to suppress the voltage deviation state by the user's manual operation. In addition, the power management system can automatically take measures to suppress the voltage deviation state by automatically controlling the device. That is, the power management system can suppress the occurrence of the reverse power flow stop by suppressing the system voltage from becoming a voltage deviation state. As a result, the user's economic loss due to the reverse power flow stop can be reduced.

  Moreover, it is preferable that the level setting part 14 sets any risk level from several risk levels according to the magnitude | size of the system voltage which the data acquisition part 12 acquired.

  In this case, the power management system can set the occurrence risk of the voltage deviation state according to the magnitude of the system voltage, and can simplify the generation risk setting process.

  Further, when the set risk level reaches a predetermined level (risk level “1”), the risk management unit 15 transmits a control signal that causes the device (information terminal 6) to notify the warning information of the voltage deviation state. Is preferred.

  In this case, the user can take a measure for suppressing the voltage deviation state based on the caution information, and thus can suppress the voltage deviation state.

  In addition, the power distribution system is configured to further enable a charging operation of supplying power from the power storage device 5 to the load 7 and charging the storage battery 53 included in the power storage device 5 with commercial power and generated power from the distributed power source. Then, when the set risk level reaches a predetermined level (risk level “2”), the risk management unit 15 causes the device (the information terminal 6) to perform an operation for requesting the user to charge the storage battery 53. It is preferable to transmit a signal.

  In this case, the user can know a specific measure for suppressing the voltage deviation state from the advice information. Therefore, even a user who does not have specialized knowledge can execute a specific measure for reducing the risk of the voltage deviation state, so that the voltage deviation state can be suppressed.

  In addition, the power distribution system is configured to further enable a charging operation of supplying power from the power storage device 5 to the load 7 and charging the storage battery 53 included in the power storage device 5 with commercial power and generated power from the distributed power source. And it is preferable that the risk management part 15 transmits the control signal for instruct | indicating execution of charge operation to the electrical storage apparatus 5, when the set risk level becomes a predetermined level (risk level "3").

  In this case, the voltage deviation state can be automatically suppressed.

  In addition, when the set risk level reaches a predetermined level (risk level “3”), the risk management unit 15 displays information on the charge rate of the storage battery 53 based on the magnitude of the system voltage acquired by the data acquisition unit 12. It is preferable to add it to the control signal.

  In this case, the power management system can suppress the oscillation of the system voltage due to the charge control.

  In addition, the power distribution system is configured to further enable a charging operation of supplying power from the power storage device 5 to the load 7 and charging the storage battery 53 provided in the power storage device 5 with commercial power and generated power from the distributed power source. The system (power management apparatus 1) preferably performs the following operations. When the set risk level becomes the first level (risk level “1”), the risk management unit 15 transmits a first control signal that causes the device (information terminal 6) to notify the warning information of the voltage deviation state. . In addition, when the set risk level is a second level (risk level “1”) higher than the first level, the risk management unit 15 performs an operation for requesting the user to perform a charging operation of the storage battery 53 (information terminal). The second control signal to be executed in 6) is transmitted. Further, when the set risk level becomes the third level (risk level “3”) higher than the second level, the risk management unit 15 performs the third control for instructing the power storage device 53 to execute the charging operation. Send a signal.

  In this case, since the risk level is divided into three stages and different control signals are transmitted for each risk level, device control suitable for each risk level can be performed.

  Also, in the power distribution system, the power that has flowed back to the power system L1 due to the reverse power flow operation is sold, and when the reverse power flow operation is stopped due to the occurrence of a voltage deviation state, the generated power during the period when the reverse power flow operation is stopped is The load 7 is adjusted to be equal to or less than the total demand power consumed. And a power monitoring system creates the loss data regarding the loss by the suppression power estimation part 18 which estimates the suppression power which is the generation power suppressed when reverse power flow operation stopped, and the loss by suppression power, and transmits loss data It is preferable to further include a loss deriving unit 19.

  In this case, the user can know the loss due to the suspension of power sale.

  Further, the distributed power source is preferably the solar power generation device 40.

  In this case, when selling the generated power of the solar power generation device 40, it is possible to suppress the occurrence of a reverse power flow stop by suppressing the system voltage from going into a voltage deviation state.

(Embodiment 2)
FIG. 4 shows the configuration of a power distribution system using the power management apparatus 1A of the present embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 1, and description is abbreviate | omitted.

  The power management apparatus 1A further includes an additional information acquisition unit 101, a history storage unit 102, a deviation detection unit 103, and a learning unit 104.

  The additional information acquisition unit 101 connects to a wide area network such as an external Internet via a router or the like, and acquires weather information and temperature information of a region to which a customer facility belongs from a server on the wide area network. Further, the power management apparatus 1A is provided with a calendar function, and the additional information acquisition unit 101 can also acquire month information, day information, and day information. The date information and day information correspond to attribute information of the day when the data acquisition unit 12 acquires the system voltage, and the attribute information may include information such as holidays and consecutive holidays.

  The history storage unit 102 stores a history of additional information (weather information, temperature information, month information, day information) acquired by the additional information acquisition unit 101.

  In the present embodiment, the reference information shown in Table 2 is stored in the reference information storage unit 13. In the reference information of this embodiment, system voltage and additional information are associated with each of the three risk levels, and Table 2 shows a table structure of the reference information. In the reference information shown as an example in Table 2, the additional information includes the month, weather, temperature, time, and day of the week.

  Hereinafter, a description will be given using the flowchart of FIG.

  First, the data acquisition unit 12 acquires system voltage measurement data from the distribution board 2 (S1). The additional information acquisition unit 101 acquires additional information (S2).

  The level setting unit 14 stores the system voltage acquired by the data acquisition unit 12 and the additional information acquired by the additional information acquisition unit 101 (that is, the current system voltage and additional information) in the reference information storage unit 13. (S3). The level setting unit 14 does not need to use all the additional information of the month, weather, temperature, time, and day of the week shown in Table 2 for collation. In this embodiment, the level setting unit 14 collates the additional information of weather, temperature, and day of the week. Used for.

  If there is a record of reference information that matches the current grid voltage and additional information (each line of the reference information table in Table 2 is one record), the level setting unit 14 sets the risk level in this record ( S4).

  The risk management unit 15 determines whether or not the risk level set by the level setting unit 14 is “1” (S5). Then, if the set risk level is “1”, the risk management unit 15 determines that the risk of occurrence of the voltage deviation state is a low level and notifies the notice signal of the voltage deviation state ( 1st control signal) is transmitted to the information terminal 6 (S6). This notification signal is, for example, image data for displaying a message of caution information such as “the system voltage will deviate after 3 hours”, voice data of the message, or the like.

  If the set risk level is not “1”, the risk management unit 15 determines whether or not the risk level set by the level setting unit 14 is “2” (S7). Then, if the set risk level is “2”, the risk management unit 15 determines that the risk that the voltage deviation state occurs is a medium level, and requests the user to perform the charging operation of the storage battery 53. (Second control signal) is transmitted to the information terminal 6 (S8). This request signal is, for example, image data for displaying an advice information message such as “the system voltage deviates after 2 hours. Please perform charge control of the storage battery”, voice data of the message, and the like.

  If the set risk level is not “2”, the risk management unit 15 determines that the risk level set by the level setting unit 14 is “3” and the risk that the voltage deviation state occurs is a high level. To do. And the risk management part 15 transmits the charge control signal (3rd control signal) for instruct | indicating execution of the charge operation which charges the storage battery 53 to the electrical storage apparatus 5 to the power converter device 3 (S9). In the power conversion device 3, the control unit 33 instructs the power storage device 5 to execute charging control.

  Further, when the risk level is “3”, the risk management unit 15 transmits to the information terminal 6 a notification signal for notifying the user that the storage battery 53 is automatically charged. The notification signal is, for example, image data for displaying a message such as “the system voltage deviates after one hour. Charging control is performed on the storage battery”, voice data of the message, and the like.

  Therefore, when there is a risk of a voltage deviation state, a message is notified from the information terminal 6 or charging control of the storage battery 53 is automatically performed according to the risk level, thereby suppressing an increase in the system voltage, The risk of deviating conditions can be reduced.

  As the reference information of the present embodiment, reference information stored in advance in the reference information storage unit 13 can be used. However, a reference information record may be added by the following learning function.

  Specifically, the power management apparatus 1A monitors the system voltage and performs device control according to the risk level of the voltage deviation state. However, even when the device control is executed, the system voltage deviates and the power sale is stopped. There is a case. Therefore, in the present embodiment, the system voltage and additional information of 1 hour, 2 hours, and 3 hours before the time when the voltage deviation state occurs can be added to the reference information.

  First, the departure detection unit 103 detects that a voltage departure state has occurred when the system voltage acquired by the data acquisition unit 12 exceeds an upper limit voltage (for example, 107 V).

  Then, the learning unit 104 reads the system voltage 3 hours before the time when the voltage deviation state occurs from the data storage unit 16, and further adds the additional information 3 hours before the time when the voltage deviation state occurs from the history storage unit 102. read out. The learning unit 104 writes the combination of the system voltage and additional information three hours ago in the reference information storage unit 13 as a new record of reference information corresponding to the risk level “1”.

  Further, the learning unit 104 reads the system voltage 2 hours before the time when the voltage deviation state occurs from the data storage unit 16, and further adds additional information 2 hours before the time when the voltage deviation state occurs from the history storage unit 102. read out. The learning unit 104 writes the combination of the system voltage and additional information two hours ago in the reference information storage unit 13 as a new record of reference information corresponding to the risk level “2”.

  Further, the learning unit 104 reads the system voltage one hour before the time when the voltage deviation state occurs from the data storage unit 16, and further adds additional information one hour before the voltage deviation state from the history storage unit 102. read out. The learning unit 104 writes the combination of the system voltage and additional information from the previous hour into the reference information storage unit 13 as a new record of reference information corresponding to the risk level “3”.

  Therefore, when the voltage deviation state actually occurs, the above-described learning function is executed to create a new reference information record, so that the power management apparatus 1A can determine the risk level of the voltage deviation state with high accuracy. Standard information can be used. Therefore, the power management apparatus 1A can accurately set the risk level of the voltage deviation state.

  In addition, even if the system voltage does not exceed the upper limit voltage, the learning unit 104, when the system voltage reaches a quasi upper limit voltage (for example, 106 V) near the upper limit voltage, is 1 hour before, 2 hours before, You may read each system voltage and additional information 3 hours ago. In this case, the learning unit 104 can change and add the reference information by using the read system voltage and additional information. This sub-maximum voltage can be changed by a user operation or the like.

  Further, in the collation process in step S3 in the flowchart of FIG. 5, the level setting unit 14 determines that there is no record of reference information that matches the acquired system voltage and additional information (current system voltage and additional information). You may perform the operation | movement of step S11. Note that weather information and temperature information are used as additional information.

  Specifically, in the collation process in step S3, the level setting unit 14 matches the current system voltage with any record of the reference information, but the additional information (weather information, temperature information) does not match the reference information. And

  In this case, the level setting unit 14 determines whether or not the following extended conditions are satisfied based on the current weather and temperature (S11). Sub-risk values are set in advance according to the weather and temperature states, and if the total of the current weather and temperature sub-risk values is equal to or greater than a predetermined value, it is determined that the expansion condition has been established. When the level setting unit 14 determines that the expansion condition is satisfied, the level setting unit 14 sets the risk level to “1” which is the lowest level.

  The weather is classified into, for example, sunny, sunny (sometimes) cloudy, cloudy, cloudy (sometimes) rain, rain, and snow. The sub-risk values are sunny “6”, sunny (sometimes) cloudy “5”, cloudy “4”, cloudy (sometimes) rain “3”, rain “2”, and snow “1”. That is, the greater the amount of solar radiation and the greater the amount of power generated by the solar power generation device 40, the higher the sub-risk value.

  Moreover, air temperature is classified into 30 degreeC or more, 20 degreeC or more and less than 30 degreeC, 10 degreeC or more and less than 20 degreeC, 0 degreeC or more and less than 10 degreeC, and less than 0 degreeC, for example. The sub-risk values are 30 ° C. or more “5”, 20 ° C. or more and less than 30 ° C. “4”, 10 ° C. or more and less than 20 ° C. “3”, 0 ° C. or more and less than 10 ° C. “2”, and less than 0 ° C. “1”. That is, it is estimated that the higher the temperature is, the larger the amount of solar radiation is, and the power generated by the solar power generation device 40 is increased, so the sub-risk value is higher. Note that the sub-risk value of the air temperature may be set to a value that takes into account the surface temperature of the solar cell 4.

  In this case, the level setting unit 14 sets the risk level to “1” which is the lowest level if the sum of the sub-risk values of the current weather and temperature is “5” or more.

  Therefore, even when there is no record of reference information that matches the current system voltage and additional information, the risk level can be set based on the sub-risk of the additional information, so that the setting accuracy of the risk level is improved.

  Next, a first modification of the present embodiment will be described. As illustrated in FIG. 7, the power management device 1 </ b> A according to the first modification further includes a prediction unit 105 and a DR acquisition unit 106.

  The prediction unit 105 has a function of predicting whether or not the risk level will be “3” within a predetermined time from now. Specifically, the prediction unit 105 includes the system voltage acquired by the data acquisition unit 12, the additional information acquired by the additional information acquisition unit 101 (that is, the current system voltage and additional information), and the reference information (see Table 2). Based on the above, for example, the possibility that the risk level becomes “3” after 3 hours is derived. For example, when the current risk level is “2” or less, the prediction unit 105 determines the difference between the current system voltage and additional information and the system voltage and additional information corresponding to the risk level “3” in the reference information. Ask for. For example, when weather information and temperature information are used as additional information, the difference in weather information is different even if it is weather information by previously determining the difference between different weather (for example, sunny and rain) numerically. Can be obtained quantitatively. The difference in temperature information is a difference in temperature.

  Then, the prediction unit 105 can predict how many hours later the risk level will be “3” in accordance with the sum (difference total value) of the difference in grid voltage, the difference in weather information, and the difference in temperature information. it can. For example, if the difference total value is small, the prediction unit 105 predicts that the risk level becomes “3” one hour after the present. If the difference total value is large, the predicting unit 105 predicts that the risk level becomes “3” after 5 hours from the present time.

  That is, the prediction unit 105 can predict whether or not the risk level becomes “3” N hours after the current time, based on the difference total value.

  When the prediction unit 105 predicts that the risk level becomes “3” after N hours, the risk management unit 15 reads the latest charge rate of the storage battery 53 from the data storage unit 16. If the charging rate is equal to or higher than a predetermined value (for example, 50%), risk management unit 15 outputs a discharge control signal for instructing power storage device 5 to execute a discharging operation for discharging storage battery 53 to the predetermined value. To the power converter 3. The risk management unit 15 estimates the discharge time required for the charging rate of the storage battery 53 to fall to a predetermined value by M hours, which is N hours after the present, and determines the transmission timing of the discharge control signal. To do. In the power conversion device 3, the control unit 33 instructs the power storage device 5 to execute discharge control.

  That is, since the chargeable capacity of the storage battery 53 is ensured before the risk level becomes “3” and the charge control of the storage battery 53 is started, the power management apparatus 1A can more reliably execute the charge control. Therefore, the power management apparatus 1A can more reliably suppress the increase in the system voltage and reduce the risk of a voltage deviation state.

  In addition, a service using a demand response for power peak cut is proposed by an electric power company or an aggregator. When this demand response is predicted that the future power demand will be close to the power supply, the demand response signal (hereinafter referred to as DR) is sent to the customer to suppress the usage of commercial power during the future power suppression period. (Referred to as “Demand Response” signal). The demand response signal corresponds to a request signal for requesting discharge of the storage battery 53 during a predetermined period.

  Therefore, the DR acquisition unit 106 is connected to a wide area network such as the external Internet via a router or the like, and receives (acquires) a DR signal transmitted from an electric power company or an aggregator. And the risk management part 15 produces a discharge control signal based on the content instruct | indicated by DR signal, and transmits this discharge control signal to the power converter device 3. FIG. In the power conversion device 3, the control unit 33 instructs the power storage device 5 to execute discharge control.

  However, when the risk level becomes “3”, the time M predicted by the prediction unit 105 may overlap (overlap) the power suppression period indicated by the DR signal. That is, the charge control performed at time M overlaps with the discharge control performed during the power suppression period.

  Therefore, the risk management unit 15 further subdivides the risk level “3” into two, “3: high” and “3: low”. And the risk management part 15 determines the content of the storage battery control after M time according to Table 3, when the charge control for the risk suppression of an electric power deviation state and the discharge control by DR signal overlap.

  The risk level “3: high” is a state in which the risk (possibility) of occurrence of a voltage deviation state is higher than the risk level “3: low”. Note that the reference information is created corresponding to each of the risk level “3: high” and the risk level “3: low”, so that the predicting unit 105 performs the risk level “3” based on the system voltage and the additional information. : High ”and risk level“ 3: Low ”can be predicted.

  For example, when the risk level at the time of M predicted by the prediction unit 105 is “3: high”, it is determined that the risk of the voltage deviation state is higher than the risk of power tightness, and the risk management unit 15 has the DR signal, The storage battery control after M o'clock is set to charge control without both DR signals.

  Further, when the risk level at M time predicted by the prediction unit 105 is “3: low”, it is determined that the risk of power tightness is higher than the risk of voltage deviation, and the risk management unit 15 has a DR signal. If there is, the storage battery control after M hours is set to discharge control. On the other hand, if there is no DR signal, the risk management unit 15 sets the storage battery control after the M hour to the charge control in order to suppress the risk of the voltage deviation state.

  Further, when the risk level at the time of M predicted by the prediction unit 105 is “2 or less”, it is determined that the risk of power tightness is higher than the risk of the voltage deviation state, and the risk management unit 15 may have a DR signal. For example, the storage battery control after the M hour is set to discharge control. On the other hand, if there is no DR signal, the risk management unit 15 does not perform charge control and discharge control.

  Therefore, even when the charge control for suppressing the risk of the power deviation state and the discharge control by the DR signal are overlapped, the charge control and the discharge control of the storage battery 53 can be appropriately switched according to the risk.

  Next, a second modification of the present embodiment will be described. As shown in FIG. 8, the power management device 1 </ b> A of the second modification further includes a drop voltage storage unit 107.

  The voltage drop storage unit 107 stores voltage drop information having the table structure shown in Table 4 as an example.

  When charge control of the storage battery 53 is performed or when the total demand power in the customer facility increases, the system voltage generally decreases. Therefore, when the charging control of the storage battery 53 is performed or when the total demand power in the customer facility increases, the learning unit 104 reduces the system voltage (voltage drop) based on the system voltage measurement data. Ask for. Further, the learning unit 104 obtains the amount of increase in the charged power or the total demand power that has caused the drop in the system voltage based on the measurement data of the charge power or the total demand power, and sets it as the increased power amount. Furthermore, the learning unit 104 reads additional information (day information, weather information) when the voltage drop occurs from the history storage unit 102. Then, the learning unit 104 adds information on the date, time, day of the week, weather, increased electric energy, and dropped voltage to the dropped voltage information. That is, the learning unit 104 learns the relationship between the drop voltage of the system voltage and the increased power amount, and stores it in the drop voltage storage unit 107 as drop voltage information.

  When the risk level is “3”, the risk management unit 15 transmits to the power conversion device 3 a charge control signal for instructing the power storage device 5 to execute the charging operation for charging the storage battery 53 (FIG. 5 step S9). At this time, the risk management unit 15 collates a voltage difference, which is a value obtained by subtracting a predetermined center voltage (for example, 101 V) from the current system voltage, with the voltage drop information. Specifically, the risk management unit 15 extracts an increased power amount corresponding to a voltage drop equal to (or closest to) the voltage difference, and adds information on the increased power amount to the charge control signal.

  In the power conversion device 3, the control unit 33 instructs the power storage device 5 to execute charging control so that the amount of charging power matches the amount of increased power. That is, the charging power amount is set by this charging control so that the system voltage decreases to the center voltage.

  Therefore, the power management apparatus 1A can suppress overshoot or excessive oscillation of the system voltage due to the charging control.

  In addition, when the risk level is “3”, the risk management unit 15 of the power management apparatus 1 </ b> A can control the operation of the load 7 in the direction in which the demand power increases in addition to the charging control of the storage battery 53. The risk management unit 15 transmits a control signal to the load 7. In this case, since the generated power of the solar power generation device 40 is used for the demand power of the load 7, the risk of a voltage deviation state can be reduced by reducing the reverse power flow and suppressing the increase of the system voltage. Further, when the commercial power supplied from the distribution board 2 is used for the demand power of the load 7, since the demand viewed from the power system L1 increases, the rise of the system voltage is suppressed, and the voltage deviation state Can reduce the risk.

  The above-described power management system (power management apparatus 1A) further includes an additional information acquisition unit 101 and a reference information storage unit 13. The additional information acquisition unit 101 acquires additional information corresponding to the situation when the data acquisition unit 12 acquires the system voltage. The reference information storage unit 13 stores reference information in which a system voltage and additional information are associated with each of a plurality of risk levels. Then, the level setting unit 14 sets any risk level from a plurality of risk levels by comparing the system voltage acquired by the data acquisition unit 12 and the additional information acquired by the additional information acquisition unit 101 with reference information. To do.

  In this case, not only the system voltage but also additional information such as weather information, temperature information, day of the week information, and the like are used together to further improve risk level setting accuracy.

  The power management system (power management apparatus 1A) preferably further includes a history storage unit 102, a deviation detection unit 103, and a learning unit 104. The history storage unit 102 stores history information that is a history of the system voltage acquired by the data acquisition unit 12 and the additional information acquired by the additional information acquisition unit 101. The departure detection unit 103 detects that a voltage departure state has occurred. When the learning unit 104 detects that a voltage deviation state has occurred, the learning unit 104 sets the system voltage and additional information a predetermined time before the voltage deviation state to a risk level corresponding to the length of the predetermined time. The data is stored in the reference information storage unit 13 in association with each other.

  In this case, when the voltage deviation state actually occurs, the learning function is executed to create a new reference information record, so that the power management apparatus 1A can determine the risk level of the voltage deviation state with high accuracy. Reference information can be used. Therefore, the power management apparatus 1A can accurately set the risk level of the voltage deviation state.

  Further, the additional information includes weather information when the data acquisition unit 12 acquires the system voltage, temperature information when the data acquisition unit 12 acquires the system voltage, and the date when the data acquisition unit 12 acquires the system voltage. It is preferably at least one piece of attribute information.

  In this case, since the risk level can be set in consideration of the weather, temperature, and day attributes, the accuracy of setting the risk level is further improved.

  Moreover, it is preferable to further include a prediction unit 105 that predicts whether or not the risk level becomes a predetermined level (risk level “3”). Then, when the prediction unit 105 predicts that the risk level becomes the predetermined level, the risk management unit 15 instructs the power storage device 5 to discharge the storage battery 53 by the timing at which the risk level is predicted to become the predetermined level. Send.

  In this case, the chargeable capacity of the storage battery 53 is ensured before the charge control of the storage battery 53 is started, and thus the power management apparatus 1A can more reliably execute the charge control. Therefore, the power management apparatus 1A can more reliably suppress the increase in the system voltage and reduce the risk of a voltage deviation state.

  Moreover, it is preferable to further include a DR acquisition unit that receives a request signal for requesting discharge of the storage battery 53 during a predetermined period. When the risk level is predicted to be a predetermined level (risk level “3”) and the predetermined period overlap, the risk management unit 15 may generate a voltage deviation state at the predicted timing. Depending on the presence / absence of the request signal, the control instructing the power storage device 5 by the predicted timing is set to discharge the storage battery 53 or charge the storage battery 53.

  In this case, even when the charge control for suppressing the risk of the power deviation state and the discharge control by the DR signal overlap, the charge control and the discharge control of the storage battery 53 can be appropriately switched according to the risk.

The power management method described above is used in a power distribution system. In this power distribution system, the commercial power supplied from the power system L1 and the generated power of the distributed power source (solar power generation device 40) are supplied to the load 7, and a reverse power flow operation is possible to reversely flow the generated power to the power system L1. It is configured. Further, the reverse power flow operation is stopped when a voltage deviation state occurs in which the system voltage of the power system L1 exceeds the upper limit voltage. The power management method includes the following steps.
-Data acquisition step for acquiring grid voltage data-Level setting step for setting any risk level from multiple risk levels according to the risk of occurrence of voltage deviation based on at least the acquired grid voltage Risk management step of transmitting a control signal for controlling the device according to the risk level Therefore, this power management method can also achieve the same effect as described above. That is, this power management method can suppress the occurrence of reverse power flow stop by suppressing the system voltage from going into a voltage deviation state. As a result, the user's economic loss due to the reverse power flow stop can be reduced.

  Moreover, the power management apparatus 1 or 1A is equipped with a computer, and the computing function of the power management apparatus 1 or 1A described above is realized by the computer executing a program. A computer mainly includes a device having a processor for executing a program, an interface device for transmitting / receiving data to / from other apparatuses, and a storage device for storing data. Prepare. A device provided with a processor may be a CPU (Central Processing Unit) or MPU (Micro Processing Unit) which is a separate body from the semiconductor memory, or a microcomputer integrally including a semiconductor memory. As a storage device, a storage device having a short access time such as a semiconductor memory and a large-capacity storage device such as a hard disk device are used in combination.

  As a program providing form, a computer-readable ROM (Read Only Memory), a form stored in advance in a recording medium such as an optical disk, a form supplied to the recording medium via a wide-area communication network including the Internet, etc. There is.

  The above-described program is used for a power distribution system. In this power distribution system, the commercial power supplied from the power system L1 and the generated power of the distributed power source (solar power generation device 40) are supplied to the load 7, and a reverse power flow operation is possible to reversely flow the generated power to the power system L1 It is configured. Further, the reverse power flow operation is stopped when a voltage deviation state occurs in which the system voltage of the power system L1 exceeds the upper limit voltage. The program causes the computer to function as the data acquisition unit 12, the level setting unit 14, and the risk management unit 15. The data acquisition unit 12 acquires system voltage data. The level setting unit 14 sets one of the risk levels from a plurality of risk levels according to the risk of occurrence of a voltage deviation state based on at least the system voltage acquired by the data acquisition unit 12. The risk management unit 15 transmits a control signal for controlling the device according to the set risk level.

  Therefore, a program that causes a computer to function as a power management system (power management apparatus 1 or 1A) can also achieve the same effects as described above. That is, this program can suppress the occurrence of reverse power flow stop by suppressing the system voltage from going into a voltage deviation state. As a result, the user's economic loss due to the reverse power flow stop can be reduced.

  Further, the configurations and operations of the above-described embodiments and modifications can be applied to the above-described power management method and program, and the same effects as described above can be obtained.

  Moreover, although each part of the power management apparatus 1 may be provided in one power management apparatus 1 in a consumer facility as described above, it may be distributed among a plurality of apparatuses. For example, the level setting unit 14 and the risk management unit 15 may be provided in a server on the network, or the cloud computer system may constitute each unit of the power management apparatus 1. Furthermore, a plurality of devices in the customer facility may be provided with each part of the power management device 1 being distributed.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

DESCRIPTION OF SYMBOLS 1,1A Power management apparatus 11 In-home communication part 12 Data acquisition part 13 Reference | standard information storage part 14 Level setting part 15 Risk management part 16 Data storage part 17 Stop period detection part 18 Suppression power estimation part 19 Loss derivation part 101 Additional information acquisition part DESCRIPTION OF SYMBOLS 102 History memory | storage part 103 Deviation detection part 104 Learning part 105 Prediction part 106 DR acquisition part 107 Drop voltage storage part 2 Distribution board 22 Voltage measurement part 3 Power converter device 4 Solar cell 40 Solar power generation device 5 Power storage device 53 Storage battery 6 Information Terminal 7 Load 8 Commercial power L1 Power system

Claims (17)

A commercial power supplied from an electric power system and a power generated by a distributed power source are supplied to a load, and a reverse power flow operation in which the generated power is reversely flowed to the power system is configured, and the system voltage of the power system is set to an upper limit voltage. A power management system used in a power distribution system in which the reverse power flow operation stops when a voltage deviation state exceeding
A data acquisition unit for acquiring data of the system voltage;
Based on at least the system voltage acquired by the data acquisition unit, from a plurality of risk levels according to the risk of occurrence of the voltage deviation state, a level setting unit for setting any risk level,
A power management system comprising: a risk management unit that transmits a control signal for controlling a device in accordance with a set risk level.   2. The power management system according to claim 1, wherein the level setting unit sets one of the plurality of risk levels according to the magnitude of the system voltage acquired by the data acquisition unit. . An additional information acquisition unit that acquires additional information corresponding to a situation when the data acquisition unit acquires a system voltage;
A reference information storage unit that stores reference information in which system voltage and additional information are associated with each of the plurality of risk levels; and
The level setting unit sets any risk level from the plurality of risk levels by collating the system voltage acquired by the data acquisition unit and the additional information acquired by the additional information acquisition unit with the reference information. The power management system according to claim 1, wherein: A history storage unit that stores history information that is a history of the system voltage acquired by the data acquisition unit and the additional information acquired by the additional information acquisition unit;
A deviation detector for detecting that the voltage deviation state has occurred;
When it is detected that the voltage deviation state has occurred, the system voltage and additional information before a predetermined time from the time when the voltage deviation state has occurred are associated with a risk level corresponding to the time length of the predetermined time. The power management system according to claim 3, further comprising: a learning unit that is stored in the reference information storage unit.   The additional information includes weather information when the data acquisition unit acquires the system voltage, temperature information when the data acquisition unit acquires the system voltage, and attributes of the day when the data acquisition unit acquires the system voltage 5. The power management system according to claim 3, wherein the power management system is at least one piece of information.   The said risk management part transmits the control signal which notifies the attention information of the said voltage deviation state from an apparatus, when the set risk level becomes a predetermined level. The power management system according to one item. The power distribution system is configured to further enable a charging operation of supplying power from a power storage device to the load, and charging the storage battery included in the power storage device with the commercial power and the generated power of the distributed power source,
The said risk management part transmits the control signal which makes an apparatus perform the operation | movement which requests | requires the charge operation of the said storage battery from a user, when the set risk level becomes a predetermined level. The power management system according to claim 5. The power distribution system is configured to further enable a charging operation of supplying power from a power storage device to the load, and charging the storage battery included in the power storage device with the commercial power and the generated power of the distributed power source,
The said risk management part transmits the control signal for instruct | indicating execution of the said charge operation to the said electrical storage apparatus, when the set risk level becomes a predetermined level. The power management system according to claim 1.   The power management system according to claim 8, further comprising a prediction unit that predicts whether or not a risk level becomes the predetermined level.   When the prediction unit predicts that the risk level becomes the predetermined level, the risk management unit instructs the power storage device to discharge the storage battery by a timing at which the risk level is predicted to be the predetermined level. The power management system according to claim 9, wherein: A DR acquisition unit for receiving a request signal for requesting discharge of the storage battery in a predetermined period;
When the timing at which the risk level is predicted to be the predetermined level and the predetermined period overlap, the risk management unit may determine whether the voltage deviation state may occur at the predicted timing and whether the request signal exists. 10. The power management system according to claim 9, wherein control for instructing the power storage device is set to discharge of the storage battery or charge of the storage battery before the predicted timing.   The risk management unit, when the set risk level becomes the predetermined level, adds information on the charge rate of the storage battery based on the magnitude of the system voltage acquired by the data acquisition unit to the control signal. The power management system according to claim 8, wherein: The power distribution system is configured to further enable a charging operation of supplying power from a power storage device to the load, and charging the storage battery included in the power storage device with the commercial power and the generated power of the distributed power source,
The risk management unit
When the set risk level becomes the first level, a first control signal for notifying the device of warning information of the voltage deviation state is transmitted.
When the set risk level is a second level higher than the first level, a second control signal is transmitted that causes the device to perform an operation requesting the user to perform a charging operation of the storage battery,
The third control signal for instructing the power storage device to execute the charging operation when the set risk level becomes a third level higher than the second level. The power management system as described in any one of thru | or 5. In the power distribution system, the power that has flowed backward to the power system by the reverse flow operation is sold, and when the reverse flow operation is stopped due to the occurrence of the voltage deviation state, the reverse flow operation is stopped The generated power is adjusted to be equal to or less than the total demand power consumed by the load,
A suppressed power estimation unit that estimates the suppressed power that is the generated power suppressed when the reverse power flow operation stops;
The power management system according to any one of claims 1 to 13, further comprising: a loss derivation unit that creates loss data related to a loss due to the suppressed power and transmits the loss data.   The power management system according to any one of claims 1 to 14, wherein the distributed power source is a solar power generation device. A commercial power supplied from an electric power system and a power generated by a distributed power source are supplied to a load, and a reverse power flow operation in which the generated power is reversely flowed to the power system is configured, and the system voltage of the power system is set to an upper limit voltage. A power management method used in a power distribution system in which the reverse power flow operation stops when a voltage deviation state exceeding
A data acquisition step of acquiring data of the system voltage;
A level setting step for setting any risk level from a plurality of risk levels according to the risk of occurrence of the voltage deviation state based on at least the acquired system voltage;
And a risk management step of transmitting a control signal for controlling the device in accordance with the set risk level. A commercial power supplied from an electric power system and a power generated by a distributed power source are supplied to a load, and a reverse power flow operation in which the generated power is reversely flowed to the power system is configured, and the system voltage of the power system is set to an upper limit voltage. A program used in a power distribution system in which the reverse power flow operation stops when a voltage deviation state exceeding
Computer
A data acquisition unit for acquiring data of the system voltage;
Based on at least the system voltage acquired by the data acquisition unit, from a plurality of risk levels according to the risk of occurrence of the voltage deviation state, a level setting unit for setting any risk level,
A program that functions as a risk management unit that transmits a control signal for controlling a device in accordance with a set risk level.

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