两种PWM整流器直接功率控制策略性能对比

The Comparison between two Modulations for PWM Rectifier based on Direct Power Control

介绍了基于定频SVPWM和不定频滞环SVPWM的三相电压型PWM整流器虚拟磁链直接功率控制策略的原理。在此基础上,从开关频率、谐波含量以及控制性能等几方面对上述两种控制策略进行了对比。结果表明,基于不定频调制方式的控制策略算法相对简单,但由于其开关频率不固定,给输入电感的设计带来了困难;在平均开关频率相同的前提下,基于定频SVPWM的直接功率控制策略有着更优良的控制性能。

The theories of space vector pulse width modulation （SVPWM） modulation based on direct power control （DPC） with fixed frequency and the SVPWM modulation based on DPC with unfixed frequency are presented and the two methods are compared in respects of the frequency of the switch,the content of the harmonic and the quality of the control.It＇s proved that the arithmetic based on the unfixed frequency is easier but it＇s difficult to design the inductance because of the unfixed frequency,SVPWM modulation based on direct power control with fixed frequency is much better at the same switch frequency.