考虑规模化快充负荷的低压互联配电台区风险评估

提出一种基于规模化电动汽车快充负荷的配电台区风险评估方法。首先，以“停车—充电”模式为基础，考虑居民区、商业区不同的充电需求，进行电动汽车快充负荷的模拟；其次，给出配电台区中快充负荷分散接入的传统方式，以及台区低压侧互联的新型接入方式，并基于此提出AC/DC变流器、储能设备的控制策略，建立台区互联的功率模型；最后，以台区变压器为中心，提出包括配变重载、超载和切负荷成本的风险指标，建立配电台区风险评估体系。以南京市某地区示范工程作为算例，讨论分析不同拓扑结构及快充负荷规模下配电台区的安全运行风险，及储能系统的对台区支撑作用。

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

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.