A NOVEL CONTROL STRATEGY FOR ENHANCEMENT OF POWER QUALITY USING FUZZY LOGIC

This paper deals with simulation of shunt active filters using fuzzy logic to improve the power quality and reduction in the transient time of capacitor voltage, when there is change in load. Shunt active power filter can compensate current harmonics by injecting equal-but-opposite harmonic compensating current .A new control strategy is proposed which is based on energy of the capacitor, dc-link voltage to reduce the transient time of capacitor The Fuzzy logic controller is used to predict the reference current values and the firing pulses were generated using hysteresis current controller. The system was modelled and simulated using MATLAB/SIMULINK power system toolbox. Analysis and comparison of the proposed strategy in terms of the response time of capacitor and power quality ,with Proportional-Integral (PI) controller and with fuzzy logic controller are the key features of the paper.