多时段及变量相关情形下电动汽车充/放电对有源配电网电压水平影响研究  

Study on the Impact of Charging/Discharging Strategy of Electric Vehicles on Voltage Level of Active Distribution System Considering Multi-period and Variable Correlations

作　　者：李雪[1] 陈豪杰 杜大军[1] 

机构地区：[1]上海市电站自动化技术重点实验室(上海大学)

出　　处：《中国电机工程学报》2018年第2期526-536,共11页Proceedings of the CSEE

基　　金：国家自然科学基金项目(61773253,61633016);上海市科委项目(15JC1401900,15220710400)~~

摘　　要：针对电动汽车充/放电对有源配电网电压冲击问题,基于概率潮流方法,研究多时段及变量相关情形下电动汽车充/放电策略对有源配电网电压水平的影响。首先考虑电动汽车不同时段的运行特性,建立电动汽车无序充电、受控充电以及基于峰谷期的受控充/放电模型,以刻画电动汽车对系统电压影响特性;然后针对风速相关性,运用Nataf变换结合初等变换将其从非正态空间转换到独立正态空间,并且采用初等变换将负荷随机变量从相关标准正态空间转换到独立正态空间,进而提出考虑变量相关性的概率潮流模型及算法,以实现多时段及变量相关情形下电动汽车充/放电对有源配电网电压水平影响分析。最后,基于改进的IEEE-33节点系统仿真结果验证考虑峰谷期的电动汽车受控充/放电策略能够有效提高电压稳定水平。Aiming at the voltage surge problem of active distribution system caused by electric vehicle （EV） charging/ discharging, using the probabilistic load flow （PLF） tool the paper discusses the impact of the charging/discharging strategy of EV on the voltage level of active distribution system considering multi-period and variable correlations. Firstly, in view of the performance of EV in different periods, the uncoordinated charging model, controlled charging model and controlled charging/discharging model of EV were proposed to represent the influence of EV on the system voltage. Secondly, Nataf transformation combined with elementary transformation （ET） was used to transform the correlated wind speeds from the correlated non-normal random vector space （CNNRVS） to the independent standard normal random vector space （ISNRVS）. Further, ET was employed to transform the correlated loads from the correlated standard normal random vector space （CSNRVS） to the ISNRVS. In turn, the PLF model and algorithm considering the correlated variables were presented to achieve the study on the impact of charging/discharging strategy of EVs on voltage level of active distribution system considering multi-period and variable correlations. Finally, the modified IEEE 33-bus active distribution system was analyzed, and the simulation results show that the controlled charging/ discharging strategy of EV can effectively improve the level of voltage stability.

关 键 词：电动汽车 有源配电网 概率潮流 相关变量 受控充/放电模型 点估计 

分 类 号：TM0[电气工程—电工理论与新技术]