Three-Phase Shunt Active Power Filter Based Fuzzy Logic Controller for the Reduction of Total Harmonic Distortion (THD)

Abstract

The proliferations of power electronics equipment and devices have led to the problems of power quality on both consumers and utilities. Some of the power quality problems are, voltage sag, voltage swell, notches, DC off set, inter harmonics and harmonics. Among the power quality problem is the harmonic which produced a distorted current wave form. To overcome this problem, a classical passive power filters is required to mitigate this harmonic produced by non-linear loads. But passive power filter is very limited in service, because it produced series and parallel resonances, heavy in size, very bulky and cannot mitigate the whole harmonics. To solve this problem, shunt active power filter is now in service which is superior to passive power filter. Shunt active power filter is tested and proven to be a viable solution to mitigate current produced by non-linear load. In this article, synchronous reference frame (SRF) algorithm is used to extract the harmonic current of the shunt active power filter. Also, a traditional fuzzy logic controller is designed to control the Dc link capacitor with the help of hysteresis current controller (HCC) which used to trigger the gating signal of the IGBT switching device of the voltage source inverter (VSI). Simulation was achieved the famous MATLAB/SIMULINK environment. Simulation results of the total harmonic distortion (THD %) of load and source currents of 25.17% and 0.83% were obtained without and with shunt active power filter respectively. The simulation results obtained are within the imposed harmonic standard limit set by IEEE 519-2024.