【Key words】 DC side active power filter; harmonic characteristics; voltage type harmonic source; current type harmonic source; one cycle control
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The harmonic characteristics of a rectifier with a DC filter inductor or capacitor are analyzed and then relevantlythey are classified into current type and voltage type harmonic source.
分析了直流侧电感和电容滤波的整流器的谐波特性，进而把它们分为电流和电压型谐波源。
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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