A Novel Reduction Method of Time Delay Existing in Detected Active Component of Harmonic Instantaneous Compensating Current Vector by Advanced Moving Average-Typed Digital Filter

Abstract

The detection of instantaneous compensating currents without delay is required in order to improve the transient response of an Active Power Filter(APF). The advanced method for reducing the delay of detecting the active component of compensating current vector is proposed in this paper. The necessary moving average value is estimated by the application of the quadratic approximation of the 3 moving average values detected in the past. The experimental results obtained from a three-phase current-source type APF are also illustrated herein. It is proved that the transient oscillations of the DC side current of APF as well as source currents are controlled effectively at the same time.