Currently the researches for Active Power Filter (APF) have two purposes: One which studies the influence of APF on system, and the other which studies the system influence on APF, that is, the security and reliability of APF.

• 目前对有源电力滤波器(APF)研究有两个方面，一是研究APF对系统的影响，即APF的补偿性能问题，二是研究系统对APF的影响，即APF的安全可靠性问题。