具有限流功能的模块化直流潮流控制器及其控制  

Modular DC Power Flow Controller with Current Limiting Function and Its Control

作　　者：黄昕昱 张家奎 徐千鸣 褚旭 王逸超 HUANG Xinyu;ZHANG Jiakui;XU Qianming;CHU Xu;WANG Yichao(College of Electrical and Information Engineering,Hunan University,Changsha 410082,China;Pingdingshan Power Supply Company of State Grid Henan Electric Power Company,Pingdingshan 467000,China)

机构地区：[1]湖南大学电气与信息工程学院,湖南省长沙市410082 [2]国网河南省电力公司平顶山供电公司,河南省平顶山市467000

出　　处：《电力系统自动化》2020年第5期38-46,共9页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2018YFB0904600)。

摘　　要：针对多端直流输电系统线路潮流控制自由度不足的问题,提出一种模块化直流潮流控制器,其采用模块化结构,便于多线间拓展,具备直流故障限流能力。首先,介绍了模块化直流潮流控制器的拓扑结构,建立了其等效电路模型,阐述了潮流控制和故障限流原理。然后,分析了模块化直流潮流控制器在潮流控制模式下的桥臂功率转移特性,研究了基于交流环流的桥臂功率平衡机理。在此基础上,提出了模块化直流潮流控制器的潮流分配控制和功率平衡控制方法,并详细说明了其在故障限流模式下的控制策略。最后,在PLECS仿真软件中搭建三端直流输电系统,验证了模块化直流潮流控制器在潮流分配、潮流反转、功率阶跃、故障限流等工况下的有效性。To solve the problem of lack of freedom of power flow control in multi-terminal DC transmission system,a modular DC power flow controller(DCPFC)is proposed,which adopts modular structure to facilitate the expansion of multiple lines and has the ability of DC fault current limiting.Firstly,the topology of DCPFC is introduced,and its equivalent circuit model is established,while the principles of power flow control and fault current limiting are described.Then the power transfer characteristics of bridge arm of DCPFC in the power flow control mode are analyzed,and the power balance mechanism of bridge arm based on AC circulation is studied.On this basis,the power distribution control and power balance control methods of DCPFC are proposed,and their control strategies in the fault current limiting mode are illustrated.Finally,a three-terminal DC transmission system is built in PLECS simulation software to verify the effectiveness of DCPFC in the conditions of power flow distribution,power flow reversal,power step and fault current limiting.

关 键 词：多端直流输电 潮流控制器 功率平衡 故障限流 

分 类 号：TM721.1[电气工程—电力系统及自动化]