逆变站电压失控导致降压运行失败的原因分析及总结  

Analysis and Summary of Reduce-voltage Operation Failure Caused by Voltage Incontrollable in Inverter Station

作　　者：程建登 袁虎强[1] 毛文俊[1] 

机构地区：[1]中国南方电网超高压输电公司昆明局,昆明650217

出　　处：《高压电器》2017年第7期192-198,204,共8页High Voltage Apparatus

摘　　要：高压直流输电系统降压运行是非正常采取的特殊运行策略,是现场调试过程中备受关注的调试项目。因此,对交流系统提供的无功功率影响直流降压运行失败的关键原因进行深入分析显得尤为重要。文中基于±800 k V糯扎渡直流输电工程在降压运行现场调试过程中发生的一起闭锁事件,根据换流器控制器选择控制原则分析出整流站无功功率不足导致直流系统限功率,从而引起逆变站误进入电流控制模式是造成闭锁的根本原因。现场仅通过降低直流负荷来解决整流站无功功率不足的问题,重做降压运行试验成功。试验结果验证了之前阀组闭锁的根本原因,并且总结了高压直流降压运行的关键要点,提出了直流降压操作前应关注的事项。The HVDC system reduce-voltage operation is a special strategy adopted by abnormal DC transmission system and has been paid more attention in the process of debugging, so, it is particularly important to make a thor- ough analysis on the key reason for the failure of DC step-down operation caused by the reactive power supplied by AC system. In this paper, based on a block event happened on the ±800 kV Nuozhadu UHVDC project reduce-volt- age operation debugging field, according to the converter controller selecting control principle, it has been found that the fundamental reason is inverter station controller entered the current control mode by mistake because of re- active power insufficient in rectifier station. By only reducing DC load to solve the problem of insufficient reactive power, the debugging personnel redo the reduce-voltage operation test successfully, it has been verified by the test result that the foregoing blocked reason. The key points for HVDC reduce-operation are summarized, and the main notices are proposed which need to be considered before HVDC reduce-operation process.

关 键 词：特高压直流输电 降压运行 电压失控 阀组闭锁 

分 类 号：TM721.1[电气工程—电力系统及自动化]