优化开关模式单相SVPWM与载波PWM统一性研究

Equivalence of Optimal Switching Pattern Single-phase SVPWM and Carrier-based PWM Study

针对单相脉宽调制(PWM)逆变器,在分析单相电压空间矢量脉宽调制(SVPWM)基本原理的基础上,给出了一种优化开关模式单相SVPWM的DSP实现方法。该模式有效避免了PWM周期间和逆变电压扇区间的电压矢量突变问题,降低了逆变开关损耗,且逆变输出波形谐波含量低。通过分析推导优化开关模式单相SVPWM的载波调制形式及其零序信号形式,论证了优化开关模式单相SVPWM与载波PWM的统一,实验结果验证了分析的正确性。

For the single-phase PWM inverter control and through the basic principle analysis of single-phase space vector pulse width modulation（SVPWM） technique,this paper presents a optimal switching pattern single-phase SVPWM technique based on DSP.This switching mode can effectively avoid the voltage vector sharp change between PWM periods or inverter voltage sectors.The optimal switching pattern single-phase SVPWM technique can reduce the switching depletion and the output distortion of inverter.Furthermore,the carrier-based PWM form and zero-sequence signal of the optimal switching pattern single-phase SVPWM is deduced.Through the analysis,the equivalence of optimal switching pattern single-phase SVPWM and carrier-based PWM is proved.The experiment proves the correctness of the analysis.