一种新型线电压直接脉宽调制方法

Novel line-to-line voltage direct pulse width modulation method

本文在研究2电平逆变器模型及其经典脉宽调制(PWM)方法基础上,提出一种新型的线电压直接脉宽调制(DPWM)方法。这种方法与传统的以相电压为参考波的脉宽调制方法不同,它以三路线电压作为参考波形,直接确定逆变器开关管在每个斩波周期内的导通时间。该方法原理清晰易于实现,可以使逆变器的直流电压利用率达到最高,仿真和实验取得了满意的控制效果。

A novel line-to-line voltage direct pulse width modulation method is presented,which is based on the study of the two-level inverter model and classical PWM principle. This new method is different from the conventional PWM method that uses phase voltage as reference waveform. It uses three line-to-line voltages as reference waveforms and determines the on time of each switch in every PWM period. This method features clear principle and easy implementation and enables the DC-link voltage utilization ratio to its maximum. Simulation and experiment result in satisfactorv control effects.