Harmonic Reduction using Shunt Active Power Filter

In this project, the shunt APF is controlled such that it eliminates the load current harmonics and supplies load reactive power to achieve harmonic free source currents at unity power factor. However, these control objectives cannot be achieved simultaneously when the supply voltages are distorted and unbalanced (non-ideal). Active power filters are the emerging devices, which can diminish harmonic pollution effectively. Hence, under such situation the shunt APF should be controlled optimally to achieve a maximum possible power factor without violating the current harmonics constraints recommended by IEEE Std. 519. Most of the proposed control strategies for power quality improvements have been reviewed with regard to performance and implementation. It has been seen that there has been a significant increase in interest of active power filters and its control methods.

Keywords: Harmonics, Filters, Shunt active power filter, Power Quality.