一种多功能模块化直流故障限流器拓扑及控制策略  

Topology and control strategy of a multifunctional modular DC fault current limiter

作　　者：张亮[1] 李丹栋 史明明 葛雪峰 袁宇波 ZHANG Liang;LI Dandong;SHI Mingming;GE Xuefeng;YUAN Yubo(School of Electrical Engineering,Nanjing Institute of Technology,Nanjing 211167,China;State Grid Jiangsu Electric Power Co.,Ltd.Research Institute,Nanjing 211103,China)

机构地区：[1]南京工程学院电力工程学院,江苏南京211167 [2]国网江苏省电力有限公司电力科学研究院,江苏南京211103

出　　处：《电力工程技术》2022年第2期105-109,共5页Electric Power Engineering Technology

基　　金：江苏省重点研发计划资助项目(BE2017169)。

摘　　要：直流故障限流器(FCL)是抑制直流短路故障电流的关键设备,其在交直流混合电网中十分重要。文中提出一种多功能模块化直流FCL拓扑,由多个电力电子功率单元子模块串联组成,通过模式控制与切换,实现故障限流、能耗泄放和直流网压支撑3种功能。文中详细分析了多功能模块化直流FCL的运行机理,给出了其在交直流混合电网中的典型配置方案,并针对3种功能对应的工作模式,完成了控制策略设计与开发。为验证拓扑结构及控制策略的有效性,在Matlab/Simulink中构建多工况仿真模型。仿真结果表明,所提模块化直流FCL拓扑及控制策略能够满足交直流混合电网多种故障情况下的故障限流应用需求。DC fault current limiter(FCL)is a key device for suppressing DC short-circuit fault currents,which is important in AC/DC hybrid grid.In this paper,topology of a multifunctional modular DC FCL is proposed,which consists of multiple series-connected power electronic modules.On the basis of analyzing its working mechanism,three functions of fault current limit,energy release and DC grid voltage support are realized.The operation mechanism of the multifunctional modular DC FCL is analyzed in detail.A typical configuration scheme is presented for its application in AC-DC hybrid grid.The design of control strategy is completed for the three functional corresponding operation modes.In order to verify the effectiveness of the topology and control strategy,a multi-case simulation model is constructed in Matlab/Simulink.The simulation results show that the proposed modular DC FCL topology and control strategy satisfy the requirements for fault current limiting applications under various fault conditions in AC/DC hybrid grid.

关 键 词：交直流混合电网 直流故障 故障限流器(FCL) 模块化 能耗泄放 多功能化 

分 类 号：TM471[电气工程—电器]