Firstly, the necessity of harmonics elimination is expatiated, research status, categorization, basic principle and popular control strategy of APF are briefly analysed , research points of the paper are also given.

• 本文首先阐述了谐波治理的必要性，简要分析了有源滤波器的研究现状、分类、基本工作原理和常用的控制策略，给出了本文的研究重点。