Installation filter in power system to control harmonic pollution could effectively reduce the system loss and avoid harmonic resonance or current amplification.

在电网中安装滤波器来治理谐波污染，可以有效地降低系统网损，能够避免谐波谐振或电流放大。

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SAPF, which only has better inhibition to current-type harmonic source, is not only less inhibitory to the voltage-type harmonic source, but also lead to harmonic amplification and load over current.

电网中不仅含有电流型谐波源负载，还存在大量电压型谐波源负载，并联型有源滤波器只对电流型谐波有较好的抑制作用，对电压型谐波不仅抑制效果较差，还会引发谐波放大，负载过流。

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