Total Harmonic Distortion (THD) in a Short Distribution Line of Varying Busbar Loads
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Date
2017-01-01
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International Academic Institute for Science and Technology
Abstract
In Electric Power Systems, attention is being focused on poor power quality issues which, in most cases, is caused by non-linear loads connected to the network. This often leads to waveform distortion. Consequently, harmonics at various electrical equipment that are connected to the power system are created. At this condition, the current or voltage Total Harmonic Distortion (THD) values violates the limits specified by IEEE 519-1992. This paper presents an investigation into the Total Harmonic Distortion of a short Distribution line (DL) with varied restoration energy in Megawatts. The distribution line of case study (Alagbon - Alagbon local) is between Alagbon 2 X 60 MVA, 132/33kV Transmission station and Alagbon local 2 X 15 MVA, 33/11kV Injection station, both within the same perimeter fence and located in Lagos, Nigeria. An algorithm as well as a Model circuit were developed and presented. This algorithm was applied to the developed Model circuit for Harmonic simulation using the MATLAB/Simulink platform. The resulting harmonic (second harmonic) at varying Busbar loads remained the same as shown in the results presented. Necessary discussions were made with conclusions drawn accordingly.