An introduction of Shunt Active Power Filter (SAPF) to improve power quality

Due to large amount of non-linear power electronic equipment’s impact and fluctuating loads , problems of power quality have become more and more serious with each passing day. Active power filtering has gained much more importance in the power quality arena as it gives the best solution for all power quality issues. Shunt active filtering is effective and the performance of such units largely depends upon the control strategies used for reference current generation. This paper presents the brief introduction of the two control techniques to determine the reference current for the three phase three wire SAPF in order to improve the power quality using PI controller. The first one is based on the Instantaneous real and reactive power (p-q) method and second one is the Instantaneous active and reactive current (Id-Iq) method.