由于励磁波动的发生具有不确定性,加之属于电气量变化且持续时间较短,往往给波动原因分析及处理带来很大困难,给机组及电网的安全稳定运行也造成一定影响。本文引用二滩水电厂1号机组励磁系统的一次典型波动案例,分析了励磁波动与外部因素及其调节性能不良、抗扰动能力差和长时间处于最小励磁限制临界区运行等有关方面的问题,并针对这些问题提出了相应的防范措施,为水电厂处理类似问题提供了借鉴。 Due to the uncertainty of the occurrence of excitation fluctuation and the short duration of change due to the electrical quantity, it is often difficult to analyze and deal with the fluctuations and cause certain impacts on the safe and stable operation of the generating units and the power grid. This paper quotes a typical case of the excitation system of Unit 1 in Ertan hydropower station, analyzes the problems of excitation fluctuation and external factors and their poor regulation performance, poor anti-disturbance ability and long-term operation in the minimum excitation limit critical area, And put forward corresponding precautionary measures against these problems, which provide references for the hydropower plant to deal with similar problems.