含三次谐波注入的SPWM在dsPIC30F单片机上的实现

摘要

对于三相电压源型逆变器，采用普通规则采样PWM控制方法，其输出基波线电压的最大幅值仅为直流母线电压的86．6％；增加一定比例三次谐波成分，可将最大调制比增加到1．15并且不会产生过调制，提高了直流母线电压利用率；利用dsPIC30F单片机实现了三次谐波注入PWM，并给出了实验结果，验证了所用方法的正确性。%For a three phase voltage-source inverter, the maximum line-to-line fundamental voltage amplitude is only about 86.6% of the DC link voltage based on the normal regular sampling PWM scheme; by adding a fraction of third harmonic component, the maximum modulation index can be increased to 1.15 without going into overmodulation and it implies a better utilization of the DC link voltage; the third harmonic injection PWM is implemented by use of the dsPIC30F MCU and the experimental results are given, which improve the correctness of the method.