基于虚拟换相面积缺乏量的HVDC系统连续换相失败抑制策略  

A Novel Method Based on Virtual Commutation Area Insufficient to Mitigate the Continuous Commutation Failure for HVDC

作　　者：刘磊[1] 林圣[1] 何正友[1] LIU Lei;LIN Sheng;HE Zhengyou(School of Electrical Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan Province,China)

机构地区：[1]西南交通大学电气工程学院

出　　处：《中国电机工程学报》2018年第18期5361-5368,共8页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2016YFB0900600);四川省科技计划项目(2018GZ0392);国家电网公司科技项目(52094017000W)~~

摘　　要：为降低高压直流输电系统发生连续换相失败的概率,从换相失败的机理出发,提出一种基于虚拟换相面积缺乏量的换相失败抑制策略。首先,定义连续滑动的虚拟换相窗,建立直流电流和换相电压的变化对换相过程影响的耦合关系,给出可以实时量化换相失败风险的虚拟换相面积缺乏指标。然后,提出一种基于虚拟换相面积缺乏指标的直流电流限制策略,可根据直流电流和换相电压的动态变化来调节直流电流指令。基于CIGRE标准测试模型的仿真结果表明,所提出的控制策略可以在一定程度上抑制直流输电系统的连续换相失败,改善其故障恢复特性。To mitigate the continuous commutation failure in high voltage direct current （HVDC） power transmission system, the mechanism of commutation failure was further investigated and a novel method based on virtual commutation area insufficient was proposed. Firstly, a continuous sliding commutation time window was defined and the index of virtual commutation area insufficient was proposed, which fundamentally establishes the coupling relationship between the effects of DC current and commutation voltage on commutation process. Furthermore, the risk of commutation faiture can be quantified in real time. Secondly, on the basis of the real-time detection results of virtual commutation area insufficient, a DC current limit control method, which adjusts the current command in accordance with DC current and commutation voltage was put forward. Simulation results based on CIGRE benchmark model show that the proposed method has the ability to mitigate the continuous commutation failure. Thus, the fault recovery performances of HVDC could be effectively improved.

关 键 词：高压直流输电 连续换相失败 换相面积 直流电流控制 换相过程 

分 类 号：TM73[电气工程—电力系统及自动化]