A Control Strategy for Active Filters using quasi-Instantaneous Positive Sequence Extraction Filters

Abstract

A novel control strategy for active filters, in which quasi-instantaneous positive sequence extraction of utility voltage is used, can be useful in harmonic polluted and/or imbalanced utility voltage. In this paper, authors examined its transient response, its performance under the change of fundamental frequency of utility voltage and its performance under utility voltage with harmonics and unbalance.