Abstract
This paper proposes a fuzzy logic based new control scheme for the Unified Power Quality Conditioner (UPQC) for minimizing the voltage sag and total harmonic distortion in the distribution system consequently to improve the power quality. UPQC is a recent power electronic module which guarantees better power quality mitigation as it has both series-active and shunt-active power filters (APFs). The fuzzy logic controller has recently attracted a great deal of attention and possesses conceptually the quality of the simplicity by tackling complex systems with vagueness and ambiguity. In this research, the fuzzy logic controller is utilized for the generation of reference signal controlling the UPQC. To enable this, a systematic approach for creating the fuzzy membership functions is carried out by using an ant colony optimization technique for optimal fuzzy logic control. An exhaustive simulation study using the MATLAB/Simulink is carried out to investigate and demonstrate the performance of the proposed fuzzy logic controller and the simulation results are compared with the PI controller in terms of its performance in improving the power quality by minimizing the voltage sag and total harmonic distortion.
Highlights
Power quality is one of the major concerns in the present era
In order to test the performance of the Unified Power Quality Conditioner (UPQC) using the proposed fuzzy logic controller (FLC), it has been simulated for a 400 V, 50 Hz threephase AC supply using MATLAB/Simulink
The confrontation in improving the power quality has become a promising area of research amongst power system and power electronic engineers and researchers
Summary
Power quality is one of the major concerns in the present era It has become important, especially with the introduction of sophisticated devices, whose performance is very sensitive to the quality of power supplied. Extended merit of the UPQC includes the following: it has a similar feature to SCR controlled capacitor banks of achieving load compensation resulting in drawing the balanced sinusoidal currents in the current control mode [4, 5]. In addition it is the most comprehensive power quality enhancing device for susceptible nonlinear loads, which need exact sinusoidal input supply [6]
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