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Abstract
Harmonic distortion is a form of electrical noise. It is a superposition of signals, which are of multiples of fundamental frequency. Proliferation of large power electronic systems results in increased harmonic distortion. Harmonic distortion results in reduction of power quality and system stability. This paper presents fuzzy control applicable for active power filter for three-phase systems, which are comprised of nonlinear loads. The active filter is based on a three-phase inverter with six controllable switches. The AC side of the inverter is connected in parallel with the other nonlinear loads through a filter inductance. The DC side of the inverter is connected to a filter capacitor. The Fuzzy Controller (FC) is used to shape the current through the filter inductor such that the line current is in phase with and of the same shape as the input voltage. The results of the computer simulation prove that the injected harmonics are greatly reduced, system efficiency and power factor are improved.
Highlights
This paper is motivated by systems which contain multiple non-linear loads, whether they may be controlled and uncontrolled rectifiers for dc based loads, triac based controllers for heating applications, or some combination of the two
The line current for continuous mode using PI and Fuzzy controller are given in Fig. 5 and 6, respectively
The line current for discontinuous mode using PI and Fuzzy controller are given in Fig. 7 and 8, respectively
Summary
This paper is motivated by systems which contain multiple non-linear loads, whether they may be controlled and uncontrolled rectifiers for dc based loads, triac based controllers for heating applications, or some combination of the two. These loads draw currents, which have high harmonic content and poor power factor. The use of active systems for compensating harmonic distortion and reactive power supply in the electrical networks, both at user level or at higher voltage level is preferred than the classical passive compensating methods. Active filters permit the control and the compensation of the distorted line currents adapting themselves to the load changes and to changing in working frequency[1,2]. The representative load used in this paper is an controlled rectifier as shown in the Fig. 1
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