Research on the Stability of the Three-Phase-Voltage-Source PWM Rectifier

摘要

The stability of the three-phase-voltage-source PWM rectifier which works in rectifying and regenerative operating modes is studied in this paper. Through small signal perturbation analysis near the static state work point,the linear mathematics model is established.With the closed loop transfer function it would be found that a changeful pole which can move with the load exists in the system and the dynamic performance would change with the load.When the PWM rectifier works on regenerative operating mode the changeful pole would become an unstable pole. The system stability caused by the gain of the PI regulator is discussed,and it is pointed out that the proportion gain can not get too large in rectifying operating mode and too small in regenerative operating mode,so the design of the control parameter for the PWM rectifier must be comprehensive.