Mitigating Harmonics Impact for Efficient Electricity Distribution in Owerri-Urban using Matlab/Simulink

Abstract

Electricity distribution grid in Nigeria is designed to operate at voltage levels of either 33 kV or 11kV and frequency of 50Hz but its performance is usually threatened by myriads of disturbances mainly at the point consumption. This disturbance is defined as disruption of the waveform's integrity, frequency, or magnitude, which clearly signifies a power quality glitch. This paper focuses on assessing the efficacy of filter in mitigating the impact of harmonics in power distribution network with emphasis on 11kV Owerri- urban distribution grid. To investigate the effect of harmonic in the system, a simulation of the distribution network is performed in two scenarios, one without filter and the other with inclusion of filter and implemented using Simulink software. The outcome revealed that percentage of total harmonic distortion in current and voltage were 17.56 %, 3.385% before addition of filters and 3.352%, 1.771% respectively, after harmonic filter was incorporated in the design. It is deduced that a well designed filter averts injection of harmonic current and voltage into the network in line with IEEE 519 -1992 specification.