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Browsing Tezler by Author "Abubakar, Sufyanu"

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    Master Thesis
    Demir çelik endüstrisinde güç kalitesi ve harmonik analizi
    (2015) Abubakar, Sufyanu; Şekerci, Hacer
    Problems involving power quality is an often occurrence which comes as nonstandard voltage, frequency or current which result in a complete failure or dysfunction of an end user equipment. Sensitive industrial loads, distribution networks and some very important commercial operation suffer the most from these forms of distortions which may lead an outage which will in turn cost a significant financial loss. With redesigning and restructuring of power systems, the problem involving power quality is going to take a different phase. In developing countries like Nigeria, power frequencies and many other things that determine power quality varies and this will lead to a serious question, it is extremely important to take great steps towards this direction. The iron and steel industry has been growing increasingly around the world in the last decade. In this thesis, power quality (PQ) investigations based on the arc furnace installations of the iron and steel plants using field measurements according to the international standard IEC 61000-4-30 are documented. Harmonics and voltage flicker problems occurring both at the common-coupling points of those plants and at the arc furnace. At this point, certain measurements were taken and analyzed using MATLAB Simulink. This analysis showed that there were harmonics in the system, and as such, the need to design a harmonic filter in order to mitigate the effects. In order to achieve an acceptable distortion, which is the sole purpose of this thesis by reducing the harmonics as well as improving the overall power quality of the system, three phase filters which filter harmonics were connected in parallel these filters will help in suppressing the higher order harmonics. variants of Butterworth, Chebyshev and Cauer filters were used in MATLAB SIMULINK. HVDC line was also checked for harmonics and also to correct the overall power factor of the system.. KEYWORDS: Power Quality (PQ), Harmonics, Harmonic filters, Iron and Steel Industry, MATLAB/SIMULINK