Fryze Current Controller Based Active Power Filter

Abstract

Harmonics in a power system can result in communication interference, transformer heating, or solid-state device malfunctions. Active power line conditioners (APLC) or Active power filter (APF) are one important way to achieve harmonic reduction. The purpose of this work is to present shunt active power filter which mitigates harmonic contents in source current due to non linear load present in the system. The novel active power filter is based on Fryze current controller with a positive sequence detector, an approach different from conventional method; the aim is to guarantee the reduction in harmonic from source current. The shunt APF system is implemented with current controlled Voltage Source Inverter (VSI) and is connected to the distribution network for canceling current harmonics. The reference currents are generated using Fryze current minimization (FCM) algorithm and switching signals for VSI are generated from hysteresis current controller (HCC). The shunt APLC system is tested and the performance parameters are obtained under various non-linear and unbalanced load conditions. This is a time domain approach, easy to understand and implement.