Most researches on APF are focused on main circuit configurations (series-type, shunt-type, compound-type), harmonic current detection approaches and control strategies to compensate current ,etc.

• 有关有源电力滤波器的研究主要集中在主电路结构形式(串联、并联和串并联)、谐波电流检测方法和补偿电流的控制方法等方面。