The PWM rectifier is a "green" power electronics equipment since it offers sinusoidalinput currents, unity or adjustable power factor, reversal of power flow.
If the nonlinear element has a single output and multiple input values, the output signal is taken to be sinusoidal and the inputs contain harmonics.
对于非线性元件的输出为单值而输入有多值的情况,令输出为正弦信号,输入包含有各次谐波。
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By using the time variant modulation ratio method, the harmonics can be eliminated and a sinusoidal and balanced output voltage or input current is obtained.