Assessment of Harmonics In Electrical Power Systems: Causes, Effects And Reduction Using Active Filters
Journal Title: International Journal of Engineering and Science Invention - Year 2018, Vol 7, Issue 8
Abstract
This paper investigates the causes, effects and reduction of harmonics currents in electrical power systems using active filters. The study evaluatesthe characteristic harmonics produced by semi-conductor converter equipment using Mathematical modeling to determine the amount of total harmonic distortion of voltages and currents at the point of common coupling; while three-phase Active filter and twelve-pulse converter were applied to mitigate harmonics currents and voltages distortion. The results revealed that power electronics devices and non-linear equipment generate harmonics currents of integer multiples of the fundamental 50Hz frequency. These causes equipment overheating, insulation stress,electromagnetic interferences noise in adjacent telephone signal or communication lines, utility meters record measurement incorrectly resulting in higher billings to consumers, thyristor firing errors in converter installations and false tripping of protective devices.Active filter injects compensation voltage into the system which compensates voltage sags and harmonics on the load side; voltage unbalance is corrected; harmonic component of load currents cancelled and the current drain from the mains supply becomes sinusoidal with unity power factor.It removes current harmonics by injecting equal but opposite harmonic current.The 12-pulse converter eliminate the 5th and 7th harmonics to a higher order where the 11th and 13th becomes the predominant harmonics.
Authors and Affiliations
J. O. Aibangbee, S. O. Ikheloa
Keywords
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