Improvement of Power Quality Using a Hybrid Interline UPQC

Abstract

— This paper proposed the reduced rating star connected transformer based interline unified power quality conditioner. This work comprises of unified power quality conditioner connected between the two feeders, star connected transformer and LC filter. This hybrid approach significantly improves the performance of UPQC under unbalance source voltage condition. The UPQC adopted to compensate current and voltage-quality problems of sensitive loads and suppressing the load current harmonics under distorted supply conditions. The series converter control strategy is based on the fuzzy-logic controller. The extensive simulation results have carried out in MATLAB/Simulink environment power system blockset toolboxes. From the results it has shown that hybrid interline UPQC achieves superior capability of mitigating the effects of voltage sag/swell and suppressing the load current harmonics, phase current harmonics and neutral current under distorted supply conditions. To validate the results produced by the proposed method, it is compared with the conventional UPQC method and better results obtained from the hybrid approach. Keyword-Power quality, Interline unified power quality conditioner, Fuzzy logic controller, Neutral current I. INTRODUCTION The increase in commercial and industrial loads has results in severe power quality problem in the distribution side. The consumption of electricity is increased randomly due to increases in consumers. Due to switching operation and nonlinear load the major disturbance is occurred in the distribution side. The major disturbances in the distribution side causes losses, mis-operation of customer equipment, damage electrical equipments. This major disturbance in the distribution side is minimized by the proposed method to a great extent. The use of non-linear loads for distribution systems has a major issue for a long time for both power provider and consumers [1]. In past Power problems are solved with the help of LC passive filters. However, this kind of converter cannot solve certain variations in the load current waveform [2]. They also can produce series and parallel resonance with source impedance. To solve these problems, several solutions have been developed and Unified Power Quality Conditioner (UPQC)) is the one of the most popular solution used nowadays. The UPQC can perform the functions of both DSTATCOM and DVR [3]. The UPQC consists of shunt and series converter having a common DC link. The series converter is connected in series with a distribution feeder 1, while the shunt converter is connected in shunt with the feeder 2. The DC links of converter are connected through a common DC capacitor. The UPQC …

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International Journal of Engineering and Technology (IJET)

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