配电网对分布式电源和电动汽车的承载力评估及提升方法综述

以新能源为主体的新型电力系统已成为未来电网发展的方向,在配电网中表现为分布式光伏、风电等分布式电源(distributed generation, DG)和电动汽车(electric vehicles, EV)渗透率的提高,因此,评估配电网对DG和EV的承载力对配电网规划具有重要意义。首先从DG和EV不确定性的建模方法、DG和EV充电桩/站选址策略、配电网承载力的评估指标和承载力评估方法等4个角度分析归纳了评估配电网对DG和EV承载力的理论基础,然后从源、网、荷、储4个方面分析了配电网承载力提升的关键技术,最后结合我国新型电力系统的发展趋势和特点对配电网承载力研究进行了展望。研究结果可为新型电力系统下配电网接入大规模分布式新能源及新型负荷的规划提供有益参考。

Review on Evaluation and Promotion Methods of Carrying Capacity for Distributed Generation and Electric Vehicles in Distribution Network

The new power system with new energy as the major energy resources has become the development direction of the future power grid. In the distribution system, it is manifested in the high penetration of distributed generation (DG), e.g., photovoltaic, wind power and electric vehicles (EVs). The carrying capacity of the distribution system for DG and EV is of great significance to the planning of the system. This paper firstly analyzes and summarizes the theoretical basis for evaluating the carrying capacity of distribution systems for DG and EV from four perspectives: the modeling method for DG and EV uncertainty, the site selection strategy of DG and EV charging pile/station, the evaluation index of distribution system’s carrying capacity, and the carrying capacity evaluation method. Then the paper analyzes the key technologies for improving the carrying capacity of the distribution system from the four aspects of source, network, load and storage. Finally, combined with the development trend and characteristics of China's new power system, the research on the carrying capacity of distribution systems is prospected. This review provides a useful reference for the planning of large-scale distributed new energy and new loads in distribution systems.