本文从谐波的危害和产生入手，先介绍了有源滤波器的原理及结构，然后对有源滤波器的谐波检测和控制方法做出分析比较。
This paper starts from source and harm of harmonics, continues with the principle and structure of APF, and a comparison of several harmonic detection and control methods.
目前电力系统谐波危害已经引起了各个部门的关注，为了整个供电系统的供电质量，必须对谐波进行有效的检测和治理。
Electric system harmonic wave have already caused concerns among each branches, we must manage harmonic wave for our electric energy quality.
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