主动换相型电流源换流器直流故障特性及恢复策略  

DC Fault Characteristics and Recovery Strategy of Actively Commutated Current Source Converter

作　　者：夏嘉航 赵成勇 XIA Jiahang;ZHAO Chengyong(State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2023年第7期2850-2859,共10页Power System Technology

摘　　要：主动换相型电流源换流器(current source converter,CSC)兼具电压源换流器(voltage source converter,VSC)与电网换相换流器(line commutated converter,LCC)的部分优点,为高压直流输电系统提供了新方案。然而,现有对CSC直流故障特性的研究不够深入,直流故障清除与恢复的控制策略有待探索。首先,分阶段分析刻画了CSC高压直流输电系统的直流故障特性;随后,基于CSC的直流故障特性,提出了直流故障时交流过电压与振荡的抑制方法,以及直流故障后系统重启恢复的控制策略;最后在PSCAD/EMTDC仿真软件中搭建了基于CSC的高压直流输电系统,验证了CSC直流故障特性分阶段刻画分析的正确性,以及CSC直流故障抑制方法与重启恢复控制策略的有效性。The actively commutated current source converter(CSC)has some advantages of a voltage source converter(VSC)and a line commutated converter(LCC),which provides a new scheme for the HVDC transmission system.However,the existing researches on the DC fault characteristics of the CSC is not so deep enough for the control strategy of the DC fault clearing and recovery to be explored.Firstly,the DC fault characteristics of the HVDC transmission system based on the CSC are analyzed and characterized in stages;Then,based on the DC fault characteristics of the CSC,the suppression method of the AC overvoltage and the oscillation in the DC fault is proposed,so are the control strategy of the system restart and recovery after the DC fault;Finally,a HVDC transmission system based on the CSC is built in the PSCAD/EMTDC simulation software to verify the correctness of the CSC DC fault characteristic analysis.The effectiveness of the CSC DC fault suppression method and restart control strategy are meanwhile verified.

关 键 词：电流源换流器 直流故障 交流过电压 振荡 恢复与重启 

分 类 号：TM721[电气工程—电力系统及自动化]