Reduction of Harmonic Distortion in Power System During Fault Occurrence

Electric powers is the main power sources utilize in our current industries.Disturbance in Power quality occurs due to changes in the magnitude of voltages and frequency.Power quality problem comes with the wide usage of nonlinear loads.During normal operation, highly nonlinear loads are the major cause of power quality disturbance and harmonics distortion.When the faults are established, harmonics are produced in the power system for a short interval of time, and voltage unbalanced are observed.It makes the quality of voltage change, produced some harmonics distortion in the system and power losses happened in the system.It is necessary to identify Power quality disorder and to improve power quality.This research work purposes to reduce the harmonics distortion using harmonics filter with thyristor device.MATLAB Model and simulation of the Power quality disturbance can provide waveform and data, which can be voltage and current.There are many harmonic minimization methods to increase the power quality and to support in a literature.In order to reduce the harmonics distortion, several controls technique such as active filter, passive filter, p-q method, Diode switch and harmonics filter with thyristor device are used.This research further explains how harmonic distortion is reduced.Results show that the harmonics filter and control thyristor give the improved results of power quality by reducing harmonics while another technique gives high Total Harmonics Distortion.The simulation model is also developed for the reduction of harmonics which occurred during the fault occurrence: