抑制LCC-HVDC后续换相失败的改进型电流偏差控制策略  

An Improved Current Deviation Control Strategy for Suppressing Subsequent Commutation Failure of LCC-HVDC

作　　者：辛业春[1] 刘奇 王拓 崔远卓 江守其 XIN Yechun;LIU Qi;WANG Tuo;CUI Yuanzhuo;JIANG Shouqi(School of Electric Power Engineering,Northeast Electric Power University,Jilin 132012,Jilin Province,China)

机构地区：[1]东北电力大学电气工程学院,吉林省吉林市132012

出　　处：《电力建设》2024年第3期97-106,共10页Electric Power Construction

基　　金：国家重点研发计划项目(2021YFB2400900);国家自然科学基金项目(U2066208)。

摘　　要：高压直流控制器交互影响可能导致后续换相失败恶化,为此,分析了故障后各时段换流器控制交互影响机理,设计了降低后续换相失败风险的策略。依据逆变侧控制器动作逻辑,将系统故障发生至恢复稳态划分为4个阶段,基于各阶段的动态轨迹分析,得到逆变侧控制器对换相失败恢复过程的影响规律,结果表明逆变侧定关断角控制与定电流控制的二次交互过程,即电流偏差控制阶段极易引发后续换相失败。提出了一种改进型电流偏差控制策略,通过补偿控制器二次交互期间电流偏差,提升关断角状态识别的准确度,从而抑制因控制器交互不当引发的后续换相失败。最后,在PSCAD/EMTDC仿真平台中以CIGRE标准算例,对不同工况下所提改进控制策略进行测试,结果表明所分析故障后动态过程准确,所提出的后续换相失败抑制策略效果显著。The interaction of HVDC controllers may lead to the deterioration of subsequent commutation failure.Therefore,this study analyzes the mechanism of converter control interaction at each stage after a fault and designs a strategy to reduce the risk of subsequent commutation failure.According to the action logic of the inverter-side controller,the process of system recovery from fault occurrence to a steady state is divided into four stages.Based on the dynamic trajectory analysis of each stage,the influence of the inverter-side controller on the commutation failure recovery process is determined.The results showed that the secondary interaction process between the constant extinction angle control and constant DC current control on the inverter side,namely,the current deviation control stage,could easily cause subsequent commutation failure.An improved current deviation control strategy is proposed to improve the accuracy of the extinction angle state recognition by compensating for the current deviation during the secondary interaction of the controllers to suppress the subsequent commutation failure caused by improper controller interaction.Finally,based on the CIGRE HVDC benchmark model,an improved control strategy is tested under different operating conditions using the PSCAD/EMTDC simulation platform.The results showed that the analysis of the fault recovery process was accurate,and that the proposed subsequent commutation failure suppression strategy was effective.

关 键 词：高压直流输电 故障恢复动态过程 电流偏差控制 后续换相失败 

分 类 号：TM712[电气工程—电力系统及自动化]