Power Quality Improvement Using Three Phase Hybrid Filter Controlled by Modified Synchronous Reference Frame

Mohamed Muftah Saleem Abdusalam

doi:10.64516/7z90as03

Authors

Mohamed Muftah Saleem Abdusalam Department of electrical and computer, Al-Khoms Engineering Faculty, Elmergib University, Libya Author

DOI:

https://doi.org/10.64516/7z90as03

Keywords:

Modified Reference Frame, Shunt Hybrid Filter, Unit Vector Generation

Abstract

The power system consists of large range of electrical, electronic and power electronic equipment in industrial and commercial applications. The power electronics equipment generates harmonic currents that are the source of adverse effects such as heating in transformers, perturbation of sensitive control equipment and resonances with grid. These problems can deteriorate the power quality in power networks. Therefore, it is very important to compensate the dominant harmonics and thus Total Harmonic Distortion (THD) below 5% as specified in IEEE 519 harmonic standard. Many solutions used to reduce this type of problems such as active filter, passive filter and hybrid filter, at the same time the performance of filters and harmonics elimination can be optimized by control strategy and filters topologies. This paper focuses on the control of shunt hybrid power filter by modified synchronous reference frame method (SRF). It focuses on the use of Self-Tuning-Filter (STF) with unit vector generation instead of Phase-Locked-Loop (PLL) circuit. The studied hybrid active filter consists of an active filter and three phase LC filters tuned for 7th harmonic frequency. The nonlinear load is a diode rectifier feeding a (R, C) parallel load. The use of STF's simplifies the control scheme by reducing the number of extraction filters. The use of STFs instead of classical extraction filters allows extracting directly the voltage and current fundamental components. The effectiveness of this study verified by computer simulation using MATLAB Simulnk with the power system toolbox under steady-state condition.

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