基于PWM整流器直接功率控制策略的研究

Research on Direct Power Control of Three-State Switch Table Based on PWM Rectifier

为了改善传统的三相电压型PWM整流器直接功率控制交流侧电流谐波大、无功功率有失控区等问题,重新划分扇区,针对不同扇区的特点设计新的开关表。有功功率的滞环比较器采用三状态开关控制,根据滞环比较器输出结果选择新的开关表,对系统进行直接功率控制。仿真结果说明,这种三状态开关表直接功率控制策略改善了交流侧电流谐波,解决了无功功率失控区的问题。

In order to improve the traditional direct power control of three-phase voltage-type PWM,the AC side current harmonics are large,and the reactive power has runaway areas.In this paper,the sectors are divided again,and new switch tables are designed according to the characteristics of different sectors.Hysteresis comparators of active power adopts three-state control,choosing new switch tables according to the output result of the hysteresis comparator to perform direct power control on the system.The simulation results show that this three-state switch table direct power control strategy improves the AC side current harmonics and the dynamic characteristics of the system,and solves the problem of reactive power runaway zone.