SCR2SPWM 变频调速系统:介绍一种以SCR 作主开关器件的SPWM 控制方式的变频调速系统,并通过实验对提出的方案进行了验证。 Abstract :The paper presents a SPWM frequency2variable and velocity2variable system with SCR as main switching devices. The proposed scheme has been verified through experiment . 叙词:晶闸管 变频调速 脉宽调制/ 公共换流 Keywords :thyristor ; VVVF;PWM/ common converting curren