适用于柔性直流电网的多端口直流潮流控制器

摘要

Most of the existing DC power flow controllers have two ports and can only execute auxiliary control for the power flow of one line.For comprehensive control of power flow distribution in the DC power grid,this paper proposes a multi-port DC power flow controller (M-DCPFC) for the flexible DC power grid,which is able to control the power flow of many lines at the same time and easy to expand.Firstly,on the basis of sufficient research on the existing DC power flow controller,the topological structure of the M-DCPFC is proposed,while its working principle is described.Secondly,the equivalent circuit of M-DCPFC is studied,then the control strategy for its stable operation design is developed.Finally,the proposed topological structure and the control strategy are verified by the Zhoushan five-port flexible high voltage direct current (HVDC) system installed with a three port DC power flow controller in the RT-LAB simulation platform.%现有的直流潮流控制器大多为双端且仅能辅助控制一条线路上的潮流.为全面控制直流电网潮流分布,文中提出了一种适用于柔性直流电网的多端口直流潮流控制器,它可以同时控制多条线路上的潮流且易于拓展.首先,在充分研究已有直流潮流控制器的基础上,提出了多端口直流潮流控制器的拓扑结构并详细阐述了工作原理;其次,研究了多端口直流潮流控制器的等效电路,进而设计了能够使其稳定运行的控制策略;最终,在RT-LAB仿真平台中搭建了舟山五端柔性直流输电系统并安装了三端口直流潮流控制器,对所提拓扑结构和控制策略进行了仿真验证.