VSC-HVDC系统直流电抗器与直流断路器参数匹配特性  

Parameter Matching Characteristics of DC Reactor and DC Circuit Breaker in VSC-HVDC System

作　　者：钟建英 冯健 程铁汉 刘恒 许晶 王钰强 ZHONG Jianying;FENG Jian;CHENG Tiehan;LIU Heng;XU Jing;WANG Yuqiang(Pinggao Group Co.,Ltd.,Pingdingshan,Henan 467001,China;Beijing Pinggao Qingda Science and Technology Development Co.,Ltd.,Beijing 100089,China)

机构地区：[1]平高集团有限公司,河南平顶山467001 [2]北京平高清大科技发展有限公司,北京100083

出　　处：《南方电网技术》2019年第11期51-60,共10页Southern Power System Technology

基　　金：平高集团有限公司科技项目(PGKJ-2018090);Supported by the Science and Technology Project of Pinggao Group Co.,Ltd.(PGKJ-2018090)

摘　　要：VSC-HVDC系统直流电抗器的主要作用是抑制故障电流上升率和故障电流峰值,配合直流断路器快速隔离直流侧故障。直流电抗器电感值的大小决定着换流器设备的运行安全和系统稳定性,对整个系统的控制保护策略执行有重要作用。目前直流电抗器电感值参数设计无相关设计标准和统一的计算方法,针对不同参数的VSC-HVDC系统,探索了一种合理科学的直流电抗器电感值参数取值方法,对系统关键设备技术参数优化取值尤为重要。分析了半桥换流器短路故障电流的产生机理,以中压柔性直流典型案例为依据进行参数取值计算,利用PSCAD/EMTDC电磁仿真软件搭建了双端VSC-HVDC系统,通过仿真验证了设计方法的正确性。The main function of DC reactor in the VSC-HVDC system is to suppress the rate of rise and peak value of the fault current,and to isolate the fault of the DC side with DC circuit breaker.The inductance value of DC reactor determines the operational safety and system stability of the inverter,it plays an important role in the excecution of control and protection strategy of the entire system.At present,there is no relevant design criteria and method of calculation for the parameters of the inductance value of DC reactor.For the different parameters of the VSC-HVDC system,it s very important to search for a reasonable method for determining the inductance value of DC reactor.This paper analyzes the generation mechanism of short-circuit current of half-bridge converter,and the parameter value calculation is based on the typical case of medium voltage flexible DC.Double-ended VSC-HVDC system is bulit in PSCAD/EMTDC electromagnetic simulation software to verify the correctness of the design method by simulation.

关 键 词：VSC-HVDC 直流断路器 直流电抗器 短路故障 

分 类 号：TM721[电气工程—电力系统及自动化]