一种消除VIENNA整流器输入电流过零畸变的SVPWM调制方法

分析了VIENNA整流器在低载波比应用中因电感压降不可忽略导致输入电流在过零点处发生畸变的原因，提出了一种使用输入电流辅助判断SVPWM大扇区的调制策略，以消除输入电流的过零畸变及降低输入电流的THD值；并针对实际工程应用中输入电流采样易受干扰的问题，提出一种软硬件相结合的滤波方法以提高扇区判断的精度。进一步，根据SVPWM电压利用率与调制比的关系，分析了输入电流辅助判断SVPWM大扇区方法的适用条件，得到使用该方法的输出电压边界条件。最后，使用MATLAB搭建了该整流器的仿真模型，并制作了一台1.5kW VIENNA整流器实验样机，仿真与实验均验证了所提出的改进型SVPWM调制方法的可行性，能有效消除输入电流的过零畸变。

SVPWM Modulation Method for Eliminating Zero-crossing Distortion of Input Current in VIENNA Rectifier

After analyzing the reason of input current distortion at zero-crossing point caused by inductance voltage drop in VIENNA rectifier in low car-rier ratio application, a method of using input current to judge the large sector of SVPWM is proposed to eliminate zero-crossing distortion of input current, which can then effectively reduce the THD value of input current. In order to improve the accuracy of sector judgment, a filtering method is proposed combining hardware and software. Further, according to the relationship between the voltage utilization ratio and the modu-lation ratio of SVPWM, the appropriate conditions of input current aided judgment method for SVPWM large sector are analyzed, and then the output voltage boundary conditions are obtained while using this method. Finally, the MATLAB simulation model of the rectifier and a 1.5kW VIENNA rectifier experimental prototype were built to verify the feasibility of the improved SVPWM modulation method, which can effec-tively eliminate input current distortion at zero-crossing point.