Whether the hybrid active power filter could get desirable effects of harmonic suppression depends on the constancy of DC-side voltage besides the correct design of the main circuit.

有源滤波器能否按其工作原理实现预期的谐波抑制效果，除了主电路设计合理之外，在很大程度上还依赖于保持直流侧电压的恒定。

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In addition, the control methods of PWM inverter and its dc side voltage are discussed.

此外，讨论了PWM逆变器及其直流侧电压的控制方法。

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Because the clamp effect of DC voltage source, AC side output the rectangular wave voltage waveform, and it has nothing to do with the load impedance Angle.

由于直流电压源的钳位作用，交流侧输出电压波形为矩形波，并且与负载阻抗角无关。

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