基于改进VDCOL的直流系统后续换相失败抑制策略  

Suppression strategy for subsequent commutation failure of DC system based on improved VDCOL

作　　者：陈睿康 李凤婷[1] 尹纯亚 刘江山 CHEN Ruikang;LI Fengting;YIN Chunya;LIU Jiangshan(School of Electrical Engineering,Xinjiang University,Urumqi 830047,China)

机构地区：[1]新疆大学电气工程学院,新疆维吾尔自治区乌鲁木齐830047

出　　处：《电力工程技术》2022年第2期2-9,共8页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(51877185)。

摘　　要：针对高压直流系统首次换相失败后在故障恢复期间的后续换相失败问题,以直流系统控制环节的动作逻辑为依据,将恢复过程划分为首次换相失败阶段(阶段1)、系统开始恢复阶段(阶段2)和电流偏差控制阶段(阶段3)。分析发现,阶段3期间直流电流恢复量过大会引发后续换相失败,为此提出了一种低压限流控制(VDCOL)改进策略,利用瞬时电压实时检测换流母线线电压幅值,根据故障后换流母线线电压大小动态调整VDCOL的最小电流指令值,减小电流偏差控制期间的直流电流恢复量,达到抑制后续换相失败的目的。最后,基于CIGRE标准模型的仿真测试结果验证了该策略在不同故障条件下抑制后续换相失败的有效性。Aiming at the problem of subsequent commutation failure during the fault recovery period after the first commutation failure of high voltage direct current system,the recovery process is divided into the first commutation failure(stage 1),the beginning of system recovery(stage 2),and the current deviation control(stage 3)based on the action logic of direct current(DC)system control link in this study.It could be found that excessive recovery of DC current will lead to subsequent commutation failure during the stage 3.On this basis,an improved strategy of voltage dependent current order limiter(VDCOL)is advanced,which uses instantaneous voltage to detect the voltage amplitude of commutation bus in real time.The minimum current instruction value of the VDCOL is dynamically adjusted in accordance with the commutation bus voltage after the alternating current(AC)faults,so as to achieve the purpose of suppressing subsequent commutation failures.Finally,the effectiveness of this strategy is proved to suppress subsequent commutation failures under different failure conditions by the simulation results based on the CIGRE benchmark model.

关 键 词：高压直流输电 故障恢复过程 低压限流控制器 后续换相失败 抑制措施 CIGRE标准模型 

分 类 号：TM712[电气工程—电力系统及自动化]