一、概述随着小水电事业的迅速发展,农村小水电面临着种种急待解决的课题,而并网和无功调节就是其中的一个。自从半导体元件问世以来,农村小水电站曾广泛使用双绕组电抗分流、移相式或谐振式相复励、三次谐波励磁等按扰动控制的各种励磁系统,这些不可控相复励方式曾为小水电的普及起过较大的作用。但上述励磁方式并不是针对并网运行设计的。这些方式 I. Overview With the rapid development of small hydropower, small hydropower in rural areas is faced with many urgent issues to be solved, and grid-connected and reactive power adjustment is one of them. Since the advent of semiconductor devices, rural small hydroelectric power stations have widely used various excitation systems controlled by disturbance, such as double-winding reactance shunting, phase shifting or resonant phase compound excitation and third harmonic excitation, etc. These uncontrollable phase compound excitation methods were The popularity of small hydropower played a greater role. However, the excitation method is not designed for grid-connected operation. These ways