某水电站500 kV送出线路同期合闸失败案例分析及处理

Analysis and Treatment of Failure Case of 500 kV Transmission Line of a Hydropower Station

电力系统中,线路电压相量和功角状况作为一组状态变量,在影响电力系统稳定性的同时又受到网络结构和电力设备运行状态的影响,是判断电网系统能否稳定运行的重要依据。针对某大型水电站按照调度指令执行送出线路恢复送电操作时,由于线路开关同期装置两侧采样点功角差偏大导致同期合闸失败的案例进行分析。

As a group of state variables of the stable operation in the power system,line voltage phasor and power angle on one hand affects the stability of power system,and on the other hand they are affected by the network structure and the running state of electrical equipment.They are the important basis to judge whether the power system can run stably.In this paper,the author analyzes a case happened on a large hydropower station where the synchronization closing fails due to the large power angle difference between the sampling points on both sides of the line switch synchronization device when executing the transmission line recovery operation in accordance with the dispatching instruction.