Harmonic Current Adaptive Predictable Based on Variable Step Size LMS Algorithm Used in APF

In the process of harmonic current detection of active power filter, considering dynamic response ability and the drawback of static accuracy in the traditional fixed step size LMS detection method, proposed a improved adaptive variable step LMS harmonic current detection algorithm. Using the history error data to regulate the step size. And the algorithm was used to detect the harmonic current in APF. The results of simulation show that, the method is more advanced both in detection accuracy and dynamic response, and has a fast dynamic response and high detection accuracy.