摘要
以抑制逆变器的谐波失真为目的,对逆变器双极性脉宽调制(PWM)和单极性PWM方式进行理论分析,指出两者区别,得出两种方式在输出平均电压为零和大于零时的输出波形。给出两种方式下逆变器失真度和效率曲线,得出单极性与双极性PWM相比在失真度和效率指标上的优势和定量区别。在相同滤波器及负载条件下,给出两种调制方式的实测失真度、效率曲线和零输出时的波形。通过实验验证了理论分析的正确性。
To suppress the harmonic distortion of inverter,bipolar pulse width modulation(PWM)and unipolar PWM modulation for inverter are reviewed,the output waveforms of both methods are given when output average voltage is zero and above zero.Distortion and efficiency curves of both methods are proposed.The unipolar PWM method has obvious advantage in distortion and efficiency relative to bipolar PWM method by comparing the distortion and efficiency curses of both methods.The measured distortion curves and efficiency curves of both methods are given in same filter and load when output is zero.Experimental results verify that the theoretical analysis is correct.
引文
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