Risk Assessment of Low-Voltage Interconnected Distribution Districts Considering Large-Scale Fast Charging Load

doi:10.11930/j.issn.1004-9649.202002003

Abstract

Abstract: A risk assessment method of distribution district is proposed based on large-scale electric vehicle(EV) fast charging load. Firstly, based on the "parking-charging" mode, and considering the different charging needs of residential areas and commercial areas, the EV fast charging load is simulated. Secondly, both the traditional decentralized access mode for fast charging load and the new access mode for low-voltage side interconnection in the distribution districts are given, and the control strategy for AC/DC converter and energy storage equipment is proposed, and the power model of distribution district interconnection is established. Finally, the risk indexes of distribution transformers, including heavy load, overload and load-shedding cost, are put forward, and a risk assessment system of distribution district is established. A demonstration project in Nanjing is taken as an example to analyze the operation risks of the distribution district under different topological structures and fast charging load scales, and the supporting effects of the energy storage system on the distribution district.

Key words: distribution district low-voltage interconnection, EV fast charging load, risk assessment, overload risk of distribution transformer, AC / DC distribution network

SHEN Peifeng, WANG Xuyan, ZHANG Haoliang, WEI Zhinong, XU Guangkai, SUN Guoqiang. Risk Assessment of Low-Voltage Interconnected Distribution Districts Considering Large-Scale Fast Charging Load[J]. Electric Power, 2021, 54(5): 56-64.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202002003

https://www.electricpower.com.cn/EN/Y2021/V54/I5/56

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