Harmonic detection based on the improved analog adaptive method

In this paper, according to the base-adaptive detecting method of harmonic current for APF, there has contradiction between detecting accuracy and dynamic response. And the weight vector of base-adaptive method is not invariable value, so this system couldn´t detect harmonic current accurately. Based on analysis above, this paper is proposed improved-adaptive detecting method. A low-pass filter has been in base-adaptive system. We first discussed the stability of improved system. Then theoretical analysis and simulation test shows the bandwidth had been reduced nearby reference frequency. Therefore improved-system can get rid of the contradiction between detecting accuracy and dynamic response.