Abstract
Commencing with incandescent light bulb, every load today creates harmonics. Unfortunately, these loads vary with respect to their amount of harmonic content and response to problems caused by harmonics. Issue of Harmonics are of a greater concern to engineers, building designers and in industrial applications because they do more than distort voltage waveforms, they can overheat the building wiring, cause nuisance tripping, overheat transformer units, and cause random end-user equipment failures. Thus power quality has become more and more serious with each passing day. As a result active power filter (APF) gains much more attention due to excellent harmonic compensation. But still the performance of the active filter seems to be in contradictions with different control techniques. The main objective of this paper is to analyse shunt active filter with fuzzy and pi controllers. To carry out the analysis, we consider active and reactive power method (p-q). Extensive simulations were carried out; simulations were performed with balance, unbalanced and non sinusoidal conditions. Simulation results validate the dynamic behaviour of fuzzy logic controller over pi controller.
Highlights
Instantaneous active and reactive theory (p-q theory) was introduced in 1984 [1]
No restrictions are imposed on the voltage and current waveforms, and it can be applied to three phase systems with or without neutral wire for three phase generic voltage and current waveforms
It is well-known that zero line may be overheated or cause fire disaster as a result of excessive harmonic current that is going through the zero line
Summary
Instantaneous active and reactive theory (p-q theory) was introduced in 1984 [1]. Since many scientists and engineers [2,3,4,5] made significant contributions to its modifications in three-phase four-wire circuits and its applications to power electronic equipment. No restrictions are imposed on the voltage and current waveforms, and it can be applied to three phase systems with or without neutral wire for three phase generic voltage and current waveforms. It is valid in the steady state and in the transient state. Eminent issues always arise in three-phase four-wire systems It is well-known that zero line may be overheated or cause fire disaster as a result of excessive harmonic current that is going through the zero line (even three times that of normal current). Present paper focuses on two controllers (fuzzy and pi) and a filter, employing the instantaneous active and reactive power (p-q) method [6] under different main voltages
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