一起换流站直流电压跌落异常分析

针对某换流站直流电压跌落异常事件,分析直流控制系统响应逻辑的正确性及导致电压跌落的直接原因为交流滤波器选相合闸效果欠佳。通过分析断路器选相合闸装置现场实际应用情况及存在的问题及此类投切滤波器组合闸原理及策略,提出优化合闸策略定值的解决措施。应用结果表明:结合一次设备运维状态,动态优化选相合闸装置定值可有效降低直流电压异常跌落的风险。

Analysis of an abnormal DC voltage drop in a converter station

Aiming at an abnormal event of the DC voltage drop anomaly in a converter station, analyzed the correctness of the response logic of the control system and the direct cause of voltage drop is the poor closing effect of the AC filter phase selection. By analyzing the actual application situation and existing problems of the circuit breaker phase selection closing device and the principle and strategy of such AC filter, propose solution measures to optimize the fixing strategy of the closing gate strategy. The application results show that combined with the once equipment operation state, dynamic ally set value of the phase selection closing device can effectively reduce the risk of abnormal drop of DC voltage.