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Electrical Engineering and Systems Science > Systems and Control

arXiv:2309.01278 (eess)
[Submitted on 3 Sep 2023 (v1), last revised 6 Sep 2023 (this version, v2)]

Title:Under-frequency Load Shedding for Power Reserve Management in Islanded Microgrids

Authors:Bei Xu, Victor Paduani, Qi Xiao, Lidong Song, David Lubkeman, Ning Lu
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Abstract:This paper introduces under-frequency load shedding (UFLS) schemes specially designed to fulfill the power reserve requirements in islanded microgrids (MGs), where only one grid-forming resource is available for frequency regulation. When the power consumption of the MG exceeds a pre-defined threshold, the MG frequency will be lowered to various setpoints, thereby triggering UFLS for different levels of load reduction. Three types of controllable devices are considered for executing UFLS: sectionalizers, smart meters, and controllable appliances. To avoid unnecessary UFLS activation, various time delay settings are analyzed, allowing short-lived power spikes caused by events like motor startups or cold-load pickups to be disregarded. We tested the proposed UFLS schemes on a modified IEEE 123-bus system on the OPAL-RT eMEGASIM platform. Simulation results verify the efficacy of the proposed approaches in restoring power reserves, maintaining phase power balance, and effectively handling short-lived power fluctuations. Furthermore, in comparison to sectionalizer-based UFLS, using smart meters or controllable loads for UFLS allows for a more accurate per-phase load shedding in a progressive manner. As a result, it leads to better balanced three-phase voltage and serves more loads.
Comments: 10 pages, 15 figures
Subjects: Systems and Control (eess.SY)
Cite as: arXiv:2309.01278 [eess.SY]
  (or arXiv:2309.01278v2 [eess.SY] for this version)
  https://doi.org/10.48550/arXiv.2309.01278

Submission history

From: Bei Xu [view email]
[v1] Sun, 3 Sep 2023 22:07:03 UTC (4,237 KB)
[v2] Wed, 6 Sep 2023 05:13:28 UTC (6,532 KB)
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