随机零矢量分配RPWM的实现及其功率谱分析

Realization and Power Spectrum Analysis of Random Zero-vector PWM

在功率变换器中,随机脉宽调制技术的作用就是把输出电压的离散谱部分转换成连续谱,降低谐波谱的峰值,达到抑制噪声和电磁干扰的目的.文中分析了随机零矢量分配的RPWM策略.推导了逆变器的开关函数和线电压的谐波谱(离散部分)和连续功率谱的解析表达式,并在实验中得到验证.

Random pulse width modulation in static power converters results in the partial transfer of power from the discrete spectrum of the output voltage to the continuous spectrum, with advantageous effects on the operation of supplied electromechanical systems. In this paper, a random PWM technique with （RZV） for three-phase voltage-controlled inverters is analyzed. Closed-form equations for the discrete and continuous power spectra of the line to-line and switching function of the inverter have been derived and confirmed by experiments. Presented theory opens a way for numerical optimization of the voltage spectra of randomly modulated inverters.