抑制特高压直流系统连续换相失败的非线性动态电流偏差控制  

A Nonlinear Dynamic Current Deviation Control Method for Suppressing Continuous Commutation Failures in UHVDC Systems

作　　者：袁博 王颖 邵华 张倩茅 秦梁栋 刘宁宁 戴志辉[3] YUAN Bo;WANG Ying;SHAO Hua;ZHANG Qianmao;QIN Liangdong;LIU Ningning;DAI Zhihui(Economic and Technology Research Institute of State Grid Hebei Electric Power Company,Shijiazhuang 050021,China;State Grid Hebei Electric Power Company,Shijiazhuang 050021,China;Department of Electrical Engineering,North China Electric Power University,Baoding 071003,China)

机构地区：[1]国网河北省电力有限公司经济技术研究院,河北石家庄050021 [2]国网河北省电力有限公司,河北石家庄050021 [3]华北电力大学电力工程系,河北保定071003

出　　处：《中国电力》2021年第8期75-82,共8页Electric Power

基　　金：国家自然科学基金资助项目(51877084);河北省自然科学基金资助项目(E2018502063);国家电网有限公司科技项目(SGHEJY00GHJS1900023)。

摘　　要：针对特高压直流系统(LCC-HVDC)系统中易发生连续换相失败的问题,提出了一种非线性动态电流偏差控制方法。该方法依据交流故障严重程度动态调整电流偏差控制运行曲线,并利用非线性曲线代替原一次线性曲线,提高熄弧角增量对电流偏差的灵敏度,增大实际熄弧角裕度,进而有效抑制直流系统连续换相失败。PSCAD/EMTDC仿真表明,所提方法能有效抑制各种类型故障导致的连续换相失败,利于故障后直流系统的快速恢复。Aiming at the continuous commutation failures in LCC-HVDC systems,a nonlinear dynamic current deviation control method is proposed.The operation curve of current deviation controller is dynamically adjusted according to the severity of AC faults.Meanwhile,the nonlinear curve is used to replace the original linear curve to improve both the sensitivity of extinction angle increment to the current deviation,and the actual extinction angle margin,thus effectively suppressing the commutation failures of DC systems.The simulation results in PSCAD/EMTDC show that the proposed control method can effectively suppress the continuous commutation failures caused by various faults and can help the rapid recovery of DC system after faults.

关 键 词：特高压直流 连续换相失败 电流偏差控制 熄弧角 故障恢复 

分 类 号：TM721.1[电气工程—电力系统及自动化]