A robust deadbeat current control method by using adaptive line enhancer for single-phase voltage source active power filter

This paper deals a deadbeat current control implementation of voltage source shunt-type single-phase active power filter (APF). Although the one-dimensional deadbeat control method can attain time-optimal responses of APF compensating current, one sampling period is actually required for its settling time. This delay is a serious drawback for the deadbeat control technique. To cancel such a delay and one more delay caused by DSP execution time, the desired APF compensating current of two sampling periods ahead has to be predicted. In the prediction process, an adaptive line enhancer is newly introduced herein to predict the control error of two sampling periods ahead. The experimental results obtained from a DSP controlled APF are also illustrated