提高特高压直流运行可靠性的分接开关优化控制策略  

Optimized Control Strategy for Less Action Frequency of Tap Changers in UHVDC

作　　者：马玉龙 宋胜利 王玲 尹健 李明 马为民 卢亚军 张俊 MA Yulong;SONG Shengli;WANG Ling;YIN Jian;LI Ming;MA Weimin;LU Yajun;ZHANG Jun(State Grid Economic and Technological Research Institute Co.,Ltd.,Beijing 102209,China;State Grid Corporation of China,Beijing 100031,China)

机构地区：[1]国网经济技术研究院有限公司,北京市102209 [2]国家电网有限公司,北京市100031

出　　处：《电力建设》2024年第4期37-45,共9页Electric Power Construction

基　　金：国家自然科学基金项目(U2166602)。

摘　　要：换流变分接开关是特高压直流工程的关键设备。近年来出现多起因分接开关故障引起的直流强迫停运甚至设备损坏事件。在特高压直流输电工程运行过程中,减少分接开关动作次数可以减少对分接开关的应力冲击,降低设备故障概率,提高系统可靠性水平。针对目前特高压直流工程中已有的分接开关控制策略,均提出了相应的优化控制策略。对于送端换流站,提出适当增大触发角控制死区及解锁前预调分接开关的策略。对于采用预测型关断角控制的受端换流站,提出直流电压动态调控策略及其改进策略。对于采用定直流电压控制的受端换流站,提出适当增大关断角控制死区及解锁前预调分接开关的策略。所提出的分接开关优化控制策略原理清晰,对已有控制策略的改动小,便于实施,已应用于在运、在建的特高压直流工程中。理论分析、仿真计算和换流站现场运行数据均表明分接开关动作次数大大减少,具有良好的应用前景。The tap changer of converter transformers is a key component in UHVDC systems.Several instances of forced converter outages or equipment damage have been attributed to tap changer faults.Reducing the action frequency of tap changers can decrease the probability of equipment fault and increase the reliability of UHVDC systems.An optimized control strategy is proposed for the typical control of tap changers in UHVDC systems.For the sending converter station,the proposed strategy suggests appropriate expansion of the triggering angle deadband and adjustment of the tap changer before converter deblocking.For a receiving converter station based on alfa-max inverter control,dynamic DC voltage control and corresponding upgrading is proposed.For a receiving converter station based on constant DC voltage control,the proposed strategy suggests expanding the extinguishing angle deadband appropriately and regulating the tap changer before converter deblocking.The presented optimized control strategy of tap changers is theoretically concise and requires minimal modifications to existing control and protection systems,making it easily applicable.Theoretical analysis results,real-time simulations,and on-site operational data validate the efficacy of the proposed strategy,showing significant reductions in tap changer actions and promising prospects for UHVDC applications.This work is supported by National Natural Science Foundation of China(No.U2166602).

关 键 词：特高压直流 分接开关控制 优化 可靠性 

分 类 号：TM721[电气工程—电力系统及自动化]