Realization of Current control strategies of Shunt Active Power Filter under Unbalanced Load

Abstract

Filtering is the major criteria to maintain power quality improvement in the three phase three wire system. Now a day Active power Filters (APF) is mostly preferable for this purpose. Conventional PI control methods are disadvantageous in eliminating high harmonics in the line current and 2nd harmonics at the DC link of a shunt APF. This PR control method which nullifies 2nd harmonics and provides better performance and accuracy compared to the Conventional positive-sequence control method and DC link voltage control method individually in terms of power quality improvement and cost effectiveness. The performance of the three control methods are demonstrated through simulation and experimental results.