说明：  This paper deals with digital control of a series active filter integrated with a diode rectifier where the series active fdter is controlled to function as a current source. A predictive current regulator is considered for the series ac- tive filter to achieve good ripple characteristics and predictable switching losses. The operating conditions, and the effect thereof on the current regulator are considered and oversam- pling and prediction of the load voltage is suggested to improve the active filtering performance without increasing the switching frequenc