天生桥一级电站机组同期无功冲击分析

Study of Synchronized Reactive Power Impulsion in Tianshengqiao Primary Power Station

发电机组同期并列点和同期电压测量点之间的变压器与电压互感器(voltage transformer,VT)变比不匹配时,将导致同期机组出现特征为无功的冲击电流,并网瞬间的冲击电流对电网、发电机组安全均存在较大隐患。针对天生桥电站的无功冲击问题,分析其发生原因,提出了无功冲击量计算方法以及相应的处理策略。无功处理策略实施后,在大部分情况下同期机组的无功冲击较小。

Under circumstance of mismatching between synchronized paralleling points of generator and ratio of transformer and voltage transformer （VT） in synchronized voltage measurement points, there will be reactive power impulse current in synchronized units. Impulse current in grid synchronization is hazardous to grid and generator units. In accordance to reac- tive power pulse in Tianshengqiao station, the paper analyzes the causes and proposes calculation method of reactive power impulse and countermeasures. After implementation of reactive power handling strategy, reactive power impulse is lessened in most cases.