且由于二者往往均表现为中性点出现位移电压，尤其是基波谐振更不易与单相接地区分。
In both of the cases above, the shift voltage of neutral point often appears. So one does not differ from the other easily, especially for the fundamental frequency ferro-resonance.
阐述了一种含基波串联谐振电路，减小逆变器输出容量的混合有源滤波器工作原理。
A new type of HAPF is expatiated including a fundamental series resonance circuit which decreases the capacity of inverters.
由于谐振网络的品质因数比较低，以往常角的基波近似分析法准确性差。
Since the Q of the resonant network in often low, the analysis in the form of fundamental sinusoidal approximation is not accurate enough.
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