Review of control strategies for power quality conditioners

Active power filter appears to be a viable solution for power quality conditioning. With the emergence of fast computing devices, control strategies for active filters are continually changing aiming at near perfect compensation. This paper presents a review of the state-of-the-art control techniques in active filters and reactive power compensation. Considerable attention is paid to the reference voltage/current estimation and control strategies. Several techniques are discussed and compared in terms of performance and implementation.