Online Centralized Charging Coordination of PEVs With Decentralized Var Discharging for Mitigation of Voltage Unbalance

IEEE Power and Energy Technology Systems Journal Pub Date : 2019-09-01 DOI:10.1109/JPETS.2019.2931396

Nasim Jabalameli, Xiangjing Su, A. Ghosh

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引用次数: 21

Abstract

The worldwide acceptance of plug-in electric vehicles (PEVs) is expected to tremendously grow in the next few years. Uncoordinated PEV charging can cause serious grid issues such as overloading of transformers and unacceptable voltage drops. Single-phase residential charging can also initiate or contribute to voltage unbalance in distribution networks. A potential solution for the PEV integration is shifting the charging activities from peak to valley periods. Therefore, this paper firstly investigates the impacts of uncoordinated single-phase PEV charging at residential houses on three-phase distribution networks. Then, it proposes a novel PEV charging coordination strategy based on heuristic genetic algorithm (GA) to perform online centralized charging considering transformer loading and bus voltage profiles. Based on this, a decentralized PEV reactive power discharging approach is presented where the reactive power is discharged at selected nodes for further reduction of voltage unbalance. The impacts of uncoordinated PEV charging as well as the performance of the proposed centralized PEV charging and decentralized var discharging strategies are tested on a real unbalanced Western Australian distribution network under the Perth Solar City project over 24 hours.

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分散无功放电pev在线集中充电协调缓解电压不平衡

插电式电动汽车(pev)的全球接受度预计将在未来几年内大幅增长。不协调的电动汽车充电会导致严重的电网问题，如变压器过载和不可接受的电压下降。单相居民充电也会引起配电网电压不平衡。电动汽车整合的一个潜在解决方案是将充电活动从高峰期转移到低谷期。因此，本文首先研究了住宅单相电动汽车充电不协调对三相配电网的影响。在此基础上，提出了一种基于启发式遗传算法(GA)的电动汽车充电协调策略，在考虑变压器负载和母线电压分布的情况下进行在线集中充电。在此基础上，提出了一种分散的PEV无功放电方法，在选定的节点上进行无功放电，进一步减小电压不平衡。不协调的电动汽车充电的影响以及拟议的集中电动汽车充电和分散无功放电策略的性能在珀斯太阳城项目下的一个实际不平衡的西澳大利亚配电网络上进行了24小时测试。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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IEEE Power and Energy Technology Systems Journal

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