Abstract—Active filters are widely employed in distribution system to reduce the harmonics. In this paper, a fuzzy logiccontrolled shunt active power filter capable of reducing the total harmonic distortion is developed. The instantaneous p-q theory is used for calculating the compensating current. Fuzzy-adaptive hysteresis band technique is adopted for the current control to derive the switching signals for the voltage source inverter. The fuzzy-adaptive hysteresis band current controller changes the hysteresis bandwidth according to the supply voltage and the slope of the reference compensator current wave. A fuzzy logic-based controller is developed to control the voltage of the DC capacitor. Simulation results obtained are presented and compared with the conventional controller. Simulation results show the effectiveness of the proposed technique for harmonic reduction.

Index Terms—Active power filter (APF), harmonics,hysteresis band, fuzzy logic control

P. Rathika, Lecturer, Dr.Sivanthi Aditanar College of Engineering,Tiruchendur, Tamilnadu 628215, India (Phone: 09344296887; e-mail:rathikasakthikumar@yahoo.co.in).
D. Devaraj, Professor and Head, Electrical and Electronics Engineering Department, Arulmigu Kalasalingam College of Engineering,Krishnankoil, Tamilnadu, India(e-mail: deva230@yahoo.com)

Cite: P. Rathika and D. Devaraj, "Fuzzy Logic – Based Approach for Adaptive Hysteresis Band and Dc Voltage Control in Shunt Active Filter," International Journal of Computer and Electrical Engineering vol. 2, no. 3, pp. 404-412, 2010.