双绕组电抗变流式励磁系统(以下简称“双绕组系统”),是广泛地用于中小型水轮发电机的一种励磁方式。这种励磁方式简单、可靠、维护方便,深受广大用户欢迎。但这种励磁方式也存在一些缺点,特别是在和大电网并联运行方面,由于这种励磁方式是按相复励基本原则设计的,发电机励磁电流与负载电流大小及功率因数关系甚大,因此,很容易发生振荡,同时无功的调整也不方便。 Double winding reactive current excitation system (hereinafter referred to as “double winding system”), is widely used in small and medium-sized hydro-generator excitation. This excitation method is simple, reliable, easy maintenance, welcomed by the majority of users. However, this excitation method also has some shortcomings. Especially in the case of parallel operation with a large power grid, since this excitation method is designed according to the basic principles of phase double excitation, the relationship between excitation current of the generator and load current magnitude and power factor is very large, , It is easy to oscillate, while the reactive power adjustment is not convenient.