Fuzzy Logic Controlled Three-Phase Three-Wired Shunt Active Power Filter for Power Quality Improvement

The simulation and experimental study of a digital signal processor based fuzzy logic controlled, three-phase shunt active power filter to improve power quality by compensating current harmonics and reactive power required by non-linear load is presented. Conventionally, dc-link voltage regulation is achieved by PI controller. However, during load changes, there is considerable variation in dc-link voltage which affects the controller dynamic performance. The proposed work replaced the PI controller by fuzzy logic controller to improve the transient performance of the dc link under fast load variations. The superiority and accuracy of fuzzy controller depends upon linguistic variable set theory and does not require a mathematical model of the system. The proposed control scheme is simple and it is capable of maintaining compensated supply currents sinusoidal and balanced, irrespective of the distortions and unbalance in load currents. Simulations are carried out using MATLAB/Simulink environment to show the effectiveness of the proposed methodology. A laboratory prototype based on TMS320F28335 digital signal processor (Texas Instrument, USA) has been developed to verify the simulations results. Simulated and experimental results reflect the effectiveness of the proposed active power filter control scheme to meet the IEEE-519 standard recommendations on harmonic limits. Copyright (C) 2011 Praise Worthy Prize S.r.l. - All rights reserved.