发电机自励磁快速验算方法及其应用

A Quick Checkout Method for Self-excitation of Generators and Its Application

发电机自励磁是发电机周期性变化的定子绕组电感与外电路容抗参数配合下产生的一种参数谐振现象,在黑启动中如何快速可靠地判断发电机带空载长线后是否会发生自励磁对电网的快速恢复是至关重要的。针对南方电网的黑启动方案,利用EMTP程序计算出各发电机带空载长线时发生自励磁的临界线路长度,总结出一种发电机自励磁的快速验算方法,并验证了该方法的有效性。

Generator self-excitation is a resonance phenomenon due to parameter coordination of the periodically changing generator-stator inductance and the external circuit capacitance,and it is crucial for a power system getting recovery quickly in its black start to make a judgment reliably and quickly whether a generator self-excitation would happen or not as the generator is with no-load long lines in the black start.According to the black start programs of China Southern Power Grid,the critical line lengths of generator self-excitation are calculated by EMTP program in this paper,and a quick checkout method of such excitation is given and verified based on the practical criterions.