Robust deadbeat current control with adaptive predictor for three-phase voltage-source active power filter

This paper is concerned with a deadbeat current control implementation of shunt-type three-phase active power filter (APF), and the method for improving the control accuracy in both a steady and a transient states is presented. To cancel a delay of settling and one more delay caused by DSP execution time, the desired APF compensating current is to be predicted two sampling periods ahead. In the prediction process, an adaptive predictor is newly applied to predict the control error of two sampling periods ahead, and the reference is modified by the predictor output, so that robustness about parameter uncertainties can be brought to the deadbeat control system.