一种抑制后续换相失败的变斜率电流偏差控制方法  

A Variable-Slope Current Deviation Control Method to Suppress Subsequent Commutation Failure

作　　者：晁武杰 邓超平 黄均纬 李元琦 王渝红[2] 陈立维 CHAO Wujie;DENG Chaoping;HUANG Junwei;LI Yuanqi;WANG Yuhong;CHEN Liwei(Fujian Power Co.,Ltd.Electric Power Research Institute,Fuzhou 350007,China;College of Electrical Engineering,Sichuan University,Chengdu 610065,China;Fujian Key Laboratory of Smart Grid Protection and Operation Control,Fuzhou 350007,China)

机构地区：[1]国网福建省电力有限公司电力科学研究院,福州市350007 [2]四川大学电气工程学院,成都市610065 [3]福建省智能电网保护与运行控制重点实验室,福州市350007

出　　处：《电力建设》2023年第1期73-81,共9页Electric Power Construction

基　　金：国家电网公司科技项目“闽粤背靠背直流输电工程协同控制与调试技术研究”(52130420001S)。

摘　　要：为降低高压直流输电系统发生后续换相失败的风险,分析了换相失败机理,并结合对称与不对称故障检测器提出了一种可根据故障严重程度调整电流偏差控制(current error control,CEC)的改进方案。分析了电流偏差控制的斜率大小对换相失败的抑制效果,发现电流偏差控制中斜坡函数的斜率越大则对输入电流偏差越敏感且换相裕度增量越大,越有利于抑制后续换相失败。最后,在PSCAD/EMTDC仿真软件中基于CIGRE HVDC标准测试系统实现了所提控制方案。仿真结果表明,所提的电流偏差控制方法能有效降低高压直流输电系统发生后续换相失败的风险,提高直流输电系统的运行特性。In order to reduce the risk of subsequent commutation failure in HVDC transmission system,the commutation failure mechanism is analyzed,and combined with symmetrical and asymmetric fault detectors,an improved scheme of current deviation control which can be adjusted according to the severity of fault is proposed.The suppression effect of the slope of current deviation control on commutation failure is analyzed.It is found that the larger the slope of slope function in current deviation control is,the more sensitive it is to input current deviation,and the larger the commutation margin increment is,the more conducive it is to suppress subsequent commutation failure.Finally,the proposed control scheme is realized on the basis of CIGRE HVDC Standard Test System in PSCAD/EMTDC simulation software.The simulation results show that the current deviation control method proposed in this paper can effectively reduce the risk of subsequent commutation failure of HVDC system and improve the operation characteristics of HVDC system.

关 键 词：高压直流输电 后续换相失败 电流偏差控制 换相裕度 

分 类 号：TM72[电气工程—电力系统及自动化]