Improvement of Power Quality Using Fuzzy Based 3-Phase UPQC under Reduced VA Rating

During the past several years, fuzzy control has emerged as one of the most active and fruitful areas for research in the applications of fuzzy set theory, especially in the realm of industrial process, which do not lend of quantities data regarding the input-output relations. This paper deals with Minimum VA rating handled by a Unified Power Quality Conditioner, which consists of Series and Shunt Active Power Filter. The Series Active Filter is Dynamic Voltage Restorer (DVR), which regulates the voltage at the point of common coupling with minimum VA loading. The Shunt Active Filter is Distribution Static Compensator(DSTATCOM) which compensates the reactive power and eliminates the load current harmonics from the source current. In this paper, Fuzzy based controller is used to extract the harmonic component in the source current. The proposed compensator compensates the harmonics and reactive power in all three phases. To regulate the dc capacitor voltage, a current control method using hysteresis controller is proposed. In this proposed method the total power handled by UPQC is minimum than the other conventional methods and it has been investigated by simulation using MATLAB/SIMULINK