基于IGCT抑制换相失败的关键控制策略  

Key Control Strategy for Suppressing Commutation Failure Based on Integrated Gate Commutated Thyristor

作　　者：刘凯[1] 王永平[1] 王俊生[1] 崔恒丰 施健 王松 LIU Kai;WANG Yongping;WANG Junsheng;CUI Hengfeng;SHI Jian;WANG Song(NR Electric Co.,Ltd.,Nanjing 211102,China;Sichuan Energy Internet Research Institute,Tsinghua University,Chengdu 610213,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏省南京市211102 [2]清华四川能源互联网研究院,四川省成都市610213

出　　处：《电力系统自动化》2024年第15期160-168,共9页Automation of Electric Power Systems

基　　金：国家电网公司科技项目(基于IGCT的直流输电运行控制关键技术研究及应用,5100-202324426A-3-2-ZN)。

摘　　要：针对基于电网换相换流器的高压直流(LCC-HVDC)输电系统因以晶闸管作为换流器件而存在的换相失败问题,以集成门极换流晶闸管(IGCT)在中国某背靠背高压直流工程中的应用为基础,首先介绍了IGCT型高压直流的拓扑及基本运行原理。接着,从兼顾换相失败抵御效果和IGCT阀的关断应力角度,提出了适应IGCT阀的关断策略。在此基础上,研究了不同类型交流故障对故障电流峰值的影响,提出了利用故障扰动系数动态调整电流控制器参数的策略,实现故障电流抑制和故障期间直流功率的稳定输送。最后,通过实时数字仿真(RTDS)验证了所提策略的正确性和有效性。Aiming at the problem of commutation failure in the line commutated converter based high voltage direct current(LCCHVDC)transmission system due to thyristors as commutation devices,taking the application of integrated gate commutated thyristors(IGCTs)in a back-to-back HVDC project in China as the basis,the topology and basic operating principles of IGCTtype HVDC are firstly described.Then,a shut-off strategy adapted to the IGCT valve is proposed to balance the commutation failure suppression effect and the IGCT valve shut-off stress.On this basis,the impacts of different types of AC faults on the fault current peak value are studied.A strategy of dynamically adjusting the current controller parameters by using fault disturbance coefficients is proposed to achieve fault current suppression and stable DC power transmission during faults.Finally,the correctness and effectiveness of the proposed strategy are verified through real-time digital simulation(RTDS).

关 键 词：高压直流输电 电网换相换流器 集成门极换流晶闸管 关断策略 换相失败 故障电流抑制 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM46