介绍了一种多级自适应滤波系统 ,用于无延时地、精确地生成有源滤波器 (APF)参考电流。该滤波系统主要包括前置低通滤波器和自适应预测滤波器 ,可以从频率和幅值均变化的负载畸变波形中提取基波正弦电流 ,而不引起基波电流的任何附加相移 A multi-stage adaptive filtering system is introduced to accurately generate active filter (APF) reference current without delay. The filter system mainly includes a pre-set low-pass filter and an adaptive predictive filter that extract the fundamental sinusoidal current from the load distortion waveform with varying frequency and amplitude without inducing any additional phase shift of the fundamental current