基于虚拟电容的高压直流后续换相失败抑制方法  

Virtual-capacitance-based Method to Suppress the Subsequent Commutation Failure in HVDC System

作　　者：穆文凯 王涛[1] 刘文轩 顾雪平[1] MU Wenkai;WANG Tao;LIU Wenxuan;GU Xueping(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]国网经济技术研究院有限公司,北京102209

出　　处：《华北电力大学学报（自然科学版）》2021年第5期25-35,共11页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家电网有限公司科技项目(521700190010).

摘　　要：针对传统高压直流在故障期间存在的后续换相失败问题,首先深掘其产生机理,指出低压限流控制(voltage dependent current order limiter,VDCOL)输出电流指令的大幅剧烈波动是后续换相失败的关键成因。然后,提出一种抑制VDCOL输入电压波动的虚拟电容控制方法,该方法有效地改善了故障后VDCOL输出电流指令的大幅剧烈波动情况,大大减小了后续换相失败的发生几率。最后,通过CIGRE直流标准测试模型实现该方法,并验证了其有效性,与其它方法相比,该控制方法在后续换相失败的抑制作用和系统恢复特性上具有显著优越性。Considering the subsequent commutation failure of traditional HVDC during the fault,the paper firstly explores its mechanism.It is fond out that the large and severe fluctuation of the output current command of the voltage dependent current order limiter(VDCOL)is the key cause of the subsequent commutation failure.Then,this paper proposes a virtual-capacitance control method that suppresses VDCOL input voltage fluctuations.This method effectively improves the large and severe fluctuations of the VDCOL output current command after a fault,obviously reducing the probability of subsequent commutation failure.Finally,the method is implemented in the CIGRE HVDC benchmark model,and its effectiveness is verified.Compared with other methods,this control method exceeds in inhibiting subsequent commutation failure and promoting system recovery.

关 键 词：高压直流 后续换相失败 虚拟电容 低压限流控制 电流指令 

分 类 号：TM721[电气工程—电力系统及自动化]