CN112467793A - Low-voltage flexible direct-current power distribution system and method for building group - Google Patents
Low-voltage flexible direct-current power distribution system and method for building group Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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Abstract
The invention discloses a building group low-voltage flexible direct-current power distribution system and a building group low-voltage flexible direct-current power distribution method. The system comprises: each component distributed in a building group comprises a power utilization end using direct current or alternating current; a direct current power supply network for providing direct current; an alternating current supply network for supplying alternating current; the energy management system is connected among all components in the building group, the direct current power supply network and the alternating current power supply network; the energy management system is used for evaluating the power utilization condition of each component and distributing the adapted direct current or alternating current to the corresponding power utilization end. According to the method, the adaptability of alternating current and direct current power distribution of the building and the building group is determined by using the system, a power distribution system planning scheme meeting the energy consumption requirements of the typical scene of the building and the building group is provided, the adaptive direct current or alternating current is distributed to the corresponding power consumption end by analyzing and evaluating the power consumption condition of each component, and an intelligent power grid and a ubiquitous power Internet of things are effectively promoted.
Description
Technical Field
The invention relates to the technical field of power transmission, in particular to a building group low-voltage flexible direct-current power distribution system and a building group low-voltage flexible direct-current power distribution method.
Background
Exhaustion of fossil energy, increasingly severe greenhouse effect and environmental pollution seriously threaten the sustainable development of human society. In order to change the traditional extensive and unsustainable energy production and consumption mode, an energy revolution with the subject of developing renewable energy and optimizing energy structures is actively being developed worldwide. By planning and forecasting, in 2050 years, the proportion of non-water renewable energy on the power supply side will reach 43%, the proportion of generalized direct current load on the load side will reach 70%, the direct current characteristic of 'load source storage' of the current distribution network is more obvious, and the requirements of terminal users on reliability and power quality are continuously improved. At the present stage, the alternating current power distribution technology is mature and still remains the main form of the current power distribution network, but with the national energy revolution and the high-quality development of the power grid, the direct current power distribution and utilization technology is a hotspot of power distribution system research due to the advantages of strong transmission capacity, high energy conversion efficiency, easiness in realizing intelligent interaction of source grid load and the like. It is therefore a current focus to develop a power distribution system that simultaneously provides both dc and ac power to a building complex.
Disclosure of Invention
The invention aims to provide a building group low-voltage flexible direct-current power distribution system and a building group low-voltage flexible direct-current power distribution method, which can be used for simultaneously distributing direct current and alternating current according to the power utilization condition of a building group.
In order to solve the technical problems, the invention adopts the following technical scheme:
in one aspect, the invention provides a building complex low voltage flexible dc power distribution system.
This building crowd low pressure flexible direct current distribution system includes:
each component distributed in a building group comprises a power utilization end using direct current or alternating current;
a direct current power supply network for providing direct current;
an alternating current supply network for supplying alternating current;
the energy management system is connected among all components in the building group, the direct current power supply network and the alternating current power supply network; the energy management system is used for evaluating the power utilization condition of each component and distributing the adapted direct current or alternating current to the corresponding power utilization end.
As a further improvement of the low-voltage flexible direct-current power distribution system of the building group:
the direct current power supply network is a photovoltaic power generation system or a wind power system.
The process of the energy management system for evaluating the electricity utilization condition of each component comprises the following steps:
1) analyzing the efficiency and the loss of each component in the building group;
2) establishing a dynamic simulation model of each module, taking loss and energy transmission paths of each module into consideration, providing a mathematical model for evaluating system loss, and carrying out energy efficiency analysis on building groups;
3) the influence of different source-to-charge ratio working conditions on the power supply efficiency of a building group is researched, the energy efficiency conditions in different time periods are researched, and new energy and an energy storage device are configured.
The calculation method for carrying out energy efficiency analysis on the building group comprises the following steps:
wherein eta isA_oA、ηB_oBRespectively representing the efficiency of energy transfer from port a or port B to port C, respectively; eAAnd EBEnergy input to the system by the power supply through the ports A and B respectively; eoAAnd EoBIs the required output energy; etaA1～ηAnAnd ηB1～ηBmAre respectively a path rA1～-rAnAnd rB1～rBmEfficiency of energy transfer; alpha is alpha1、α2…αnAnd beta1、β2…βnThe weight of the energy transmitted by each path in the total energy input by the corresponding input port of the path is represented, and the following requirements are met:
α1+α2+…+αn＝β1+β2+…+βm＝1。
the building group low-voltage flexible direct-current power distribution system further comprises an electric vehicle charging system connected with the energy management system.
The building group low-voltage flexible direct-current power distribution system further comprises an energy storage system connected with the energy management system.
On the other hand, the invention also provides a building group low-voltage flexible direct-current power distribution method.
The low-voltage flexible direct-current power distribution method for the building group comprises the following steps:
1) the energy management system is simultaneously accessed to a direct current power supply network, an alternating current power supply network and various power utilization ends in a building group;
2) analyzing the efficiency and the loss of each component in the building group;
3) establishing a dynamic simulation model of each module, taking loss and energy transmission paths of each module into consideration, providing a mathematical model for evaluating system loss, and carrying out energy efficiency analysis on building groups;
4) the influence of different source-to-charge ratio working conditions on the power supply efficiency of a building group is researched, the energy efficiency conditions in different time periods are researched, and new energy and an energy storage device are configured.
As a further improvement of the low-voltage flexible direct-current power distribution method of the building group:
the calculation method for carrying out energy efficiency analysis on the building group comprises the following steps:
wherein eta isA_oA、ηB_oBRespectively representing the efficiency of energy transfer from port a or port B to port C, respectively; eAAnd EBEnergy input to the system by the power supply through the ports A and B respectively; eoAAnd EoBIs the required output energy; etaA1～ηAnAnd ηB1～ηBmAre respectively a path rA1～-rAnAnd rB1～rBmEfficiency of energy transfer; alpha is alpha1、α2…αnAnd beta1、β2…βnThe weight of the energy transmitted by each path in the total energy input by the corresponding input port of the path is represented, and the following requirements are met:
α1+α2+…+αn＝β1+β2+…+βm＝1。
the energy management system is simultaneously connected to the electric vehicle charging system, and power distribution is carried out after the power utilization condition of the electric vehicle charging system is analyzed. The energy management system is connected to the energy storage system at the same time and used as a standby power supply during the peak time of power utilization.
The invention has the beneficial effects that:
according to the invention, through determining the adaptability of alternating current and direct current distribution and utilization of the building and the building group, a power distribution system planning scheme meeting the typical scene energy utilization requirements of the building and the building group is provided, and the adaptive direct current or alternating current is distributed to the corresponding power utilization end through analyzing and evaluating the power utilization condition of each component, so that the intelligent power grid and the ubiquitous power Internet of things are effectively promoted, and the three-in-one of energy source flow, service flow and data flow is effectively constructed.
Drawings
Fig. 1 is a block diagram of a preferred embodiment of a building complex low voltage flexible dc power distribution system.
Fig. 2 is a schematic diagram of specific connections of the embodiment of fig. 1.
Fig. 3 is a main flow chart of a building group low-voltage flexible direct-current power distribution method.
Fig. 4 is a schematic diagram of energy efficiency analysis for building groups.
Detailed Description
The present invention will now be described with reference to the accompanying drawings, wherein the specific embodiments described herein are merely illustrative and explanatory of the invention and are not restrictive thereof.
Referring to fig. 1, a building complex low voltage flexible dc power distribution system includes:
each component distributed in a building group comprises a power utilization end using direct current or alternating current;
a direct current power supply network for providing direct current;
an alternating current supply network for supplying alternating current;
an electric vehicle charging system for charging an electric vehicle;
an energy storage system for use as a reserve power supply;
and the energy management system is respectively and simultaneously connected with each component in the building group, the direct current power supply network, the alternating current power supply network, the electric vehicle charging system and the energy storage system.
The energy management system is used for evaluating the power utilization condition of each component and distributing the adapted direct current or alternating current to the corresponding power utilization end.
With continued reference to FIG. 2, a more specific embodiment is provided herein. The "utility power" in the figure is the ac power supply network, which is an existing conventional ac power supply system. The direct current power supply network is mainly a photovoltaic power generation system or a wind power system, the electric energy of the direct current power supply network is derived from photovoltaic power generation or wind power, and the photovoltaic glass and the windmill in the figure represent the direct current power source. The components comprise charging columns, elevators, lighting, curtain control, fresh air blowers, water pumps, air conditioners and other equipment. The hardware of the energy management system comprises a first distribution box, a second distribution box, a third distribution box and a fourth distribution box; the first, second, third and fourth switchgears are conventional switchgears.
Based on the system, with continued reference to fig. 3, the building group low-voltage flexible direct-current power distribution method includes:
1) the energy management system is simultaneously accessed to a direct current power supply network, an alternating current power supply network and various power utilization ends in a building group;
2) analyzing the efficiency and the loss of each component in the building group;
3) establishing a dynamic simulation model of each module, taking loss and energy transmission paths of each module into consideration, providing a mathematical model for evaluating system loss, and carrying out energy efficiency analysis on building groups;
4) the influence of different source-to-charge ratio working conditions on the power supply efficiency of a building group is researched, the energy efficiency conditions in different time periods are researched, and new energy and an energy storage device are configured.
Specifically, fig. 3 is a schematic diagram of a power supply system including two input ports and one output port, although the input ports are not limited thereto. In the figure, A and B are input ports, C is an output port, EAAnd EBEnergy (unit: Joule) input by power supply to system through ports A and B, respectively, EoIs the energy output by the output port. r isA1～rAnRepresenting the possible n transmission paths of energy, r, from port A to port CB1～rBmRepresenting the possible m energy transmission paths from port B to port C. Let EoAAnd EoBAre each EoThe energy from the port A and the port B satisfies the following conditions:
EoA+EoB＝Eo
obviously, in EAAnd EBIn the known case, EoAAnd EoBI.e. the output energy to be determined for the efficiency of the analysis system, can be determined from the energy passage rA1～rAnAnd rB1～rBmThe efficiency of the transmission is found. By analyzing the internal structural composition of the system, the path r can be knownA1～rAnAnd rB1～rBmEfficiency of energy transmission, defined as ηA1～ηAnAnd ηB1～ηBmAnd E isAAnd EBThese paths are allocated according to the following relationship:
in the formula, alpha1、α2…αnAnd beta1、β2…βnAll the energy transmitted by each path is negative, the weight of the energy transmitted by each path in all the energy input by the corresponding input port of the path is represented, the size of the energy is related to the operation mode or the scheduling mode of the system, and the following requirements are met:
α1+α2+…+αn＝β1+β2+…+βm＝1
thus, EoAAnd EoBThe expression of (a) is:
when the efficiency conditions of different bus architectures need to be compared, corresponding formula (4) in each architecture is solved, and E is comparedoAAnd EoBThe size of the powder is just required. Assuming that the working conditions of the architecture systems to be compared are the same, the input energy E corresponding to each architectureAAnd EBEquality, therefore, comparing E found for different architecturesoAAnd EoBThe value of (b) can be actually converted into a calculation formula in parentheses in the corresponding two expressions in the comparative expression (4). The physical meaning of the two parenthetical calculations is the efficiency of energy transfer from port A or port B to port C, in ηA_oAAnd ηB_oBThese two efficiencies are shown separately, then:
the formula shows that under the condition that the working conditions of all the systems to be compared are the same, the working efficiency of different systems is irrelevant to the energy input by the systems. For a power supply system including an energy storage element, it should be noted that the energy storage element only stores electric energy, and a port where the energy storage element is located is neither an input port nor an output port, and can only be used as a link through which energy passes in a transmission path. For the grid interface, the interface can be used as both an input port and an output port of the system, and during analysis, the interface should be equivalent to two ports, where one port only has energy flowing into the system from the grid, and the other port only has energy fed back to the grid from the system. And energy efficiency analysis can be carried out on the building group according to the formula.
In addition, the energy management system is simultaneously connected to the electric vehicle charging system, and power distribution is carried out after the power utilization condition of the electric vehicle charging system is analyzed. The energy management system is connected to the energy storage system at the same time and used as a standby power supply during the peak time of power utilization.
Claims (10)
1. Building crowd low pressure flexible direct current distribution system, its characterized in that includes:
each component distributed in a building group comprises a power utilization end using direct current or alternating current;
a direct current power supply network for providing direct current;
an alternating current supply network for supplying alternating current;
the energy management system is connected among all components in the building group, the direct current power supply network and the alternating current power supply network; the energy management system is used for evaluating the power utilization condition of each component and distributing the adapted direct current or alternating current to the corresponding power utilization end.
2. The building complex low voltage flexible dc power distribution system of claim 1, wherein:
the direct current power supply network is a photovoltaic power generation system or a wind power system.
3. The building complex low voltage flexible DC power distribution system of claim 1,
the process of the energy management system for evaluating the electricity utilization condition of each component comprises the following steps:
1) analyzing the efficiency and the loss of each component in the building group;
2) establishing a dynamic simulation model of each module, taking loss and energy transmission paths of each module into consideration, providing a mathematical model for evaluating system loss, and carrying out energy efficiency analysis on building groups;
3) the influence of different source-to-charge ratio working conditions on the power supply efficiency of a building group is researched, the energy efficiency conditions in different time periods are researched, and new energy and an energy storage device are configured.
4. The building group low-voltage flexible direct-current power distribution system according to claim 3, wherein the calculation method for performing energy efficiency analysis on the building group comprises the following steps:
wherein eta isA_oA、ηB_oBRespectively representing the efficiency of energy transfer from port a or port B to port C, respectively; eAAnd EBEnergy input to the system by the power supply through the ports A and B respectively; eoAAnd EoBIs the required output energy; etaA1～ηAnAnd ηB1～ηBmAre respectively a path rA1～-rAnAnd rB1～rBmEfficiency of energy transfer; alpha is alpha1、α2…αnAnd beta1、β2…βnThe weight of the energy transmitted by each path in the total energy input by the corresponding input port of the path is represented, and the following requirements are met:
α1+α2+…+αn＝β1+β2+…+βm＝1。
5. the building complex low voltage flexible dc power distribution system of claim 1, wherein:
the electric vehicle charging system is connected with the energy management system.
6. The building complex low voltage flexible dc power distribution system of claim 1, wherein:
the energy management system is connected with the energy storage system.
7. A building group low-voltage flexible direct-current power distribution method is characterized by comprising the following steps:
1) the energy management system is simultaneously accessed to a direct current power supply network, an alternating current power supply network and various power utilization ends in a building group;
2) analyzing the efficiency and the loss of each component in the building group;
3) establishing a dynamic simulation model of each module, taking loss and energy transmission paths of each module into consideration, providing a mathematical model for evaluating system loss, and carrying out energy efficiency analysis on building groups;
4) the influence of different source-to-charge ratio working conditions on the power supply efficiency of a building group is researched, the energy efficiency conditions in different time periods are researched, and new energy and an energy storage device are configured.
8. The building group low-voltage flexible direct-current power distribution method according to claim 7, wherein a calculation method for carrying out energy efficiency analysis on the building group comprises the following steps:
wherein eta isA_oA、ηB_oBRespectively representing the efficiency of energy transfer from port a or port B to port C, respectively; eAAnd EBEnergy input to the system by the power supply through the ports A and B respectively; eoAAnd EoBIs the required output energy; etaA1～ηAnAnd ηB1～ηBmAre respectively a path rA1～-rAnAnd rB1～rBmTransmitting energyThe efficiency of (c); alpha is alpha1、α2…αnAnd beta1、β2…βnThe weight of the energy transmitted by each path in the total energy input by the corresponding input port of the path is represented, and the following requirements are met:
α1+α2+…+αn＝β1+β2+…+βm＝1。
9. the building group low voltage flexible DC power distribution method according to claim 7,
the energy management system is simultaneously connected to the electric vehicle charging system, and power distribution is carried out after the power utilization condition of the electric vehicle charging system is analyzed.
10. The building group low voltage flexible DC power distribution method according to claim 7,
the energy management system is connected to the energy storage system at the same time and used as a standby power supply during the peak time of power utilization.
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