基于锁相环的自并励励磁系统的相位检测

Based on Phase-locked Loop of Phase Detection for Self-shunt Excitation System

自并励励磁系统需要准确获得机端电压的实时相位,在不同时刻发出脉冲以控制晶闸管的导通,从而实现机端电压的恒定。提出了一种软件锁相环算法,该算法通过交流采样,根据同步旋转坐标跟踪原理,实现输出相位和机端电压相位的实时锁相,以此来控制可控硅的导通角度。实验表明,该锁相环算法精度高,具有很高的响应速度,对畸变电压有很强的抑制作用。

It is important for self-shunt excitation system to get accurate real-time phase terminal voltage and pulse thyristors at different times. This paper presents a software phase-locked loop algorithm based on the principle of synchronous rotating coordinate tracking, and it realizes phase-locked between real-time phase and terminal voltage phase. Experiments show that the phase-locked loop algorithm has strong interference ability and high response speed.