Mitigation of Harmonics Effects on Power Quality

Abstract

This thesis presents the definitions of harmonics, generation, causes, and solutions due to IEEE 519 standard of harmonics. The basic aim of the study is how to mitigate the Harmonics effect on power quality. The Harmonics in power Systems comes from transformers or saturable reactors, arc furnace, welding machines, florescent lamps, rotating machines and power electronics devices. In general, the non linear loads in which the relationship between the voltage and current is not constant. It is considered that there is no risk of harmful perturbation from 5 to 10%, above 10% problems will certainly occur. Equipments can be affected by the harmonics like transformers and motors with increase of losses, risk of overheating, noise and even insulation stress problems. Cables that can heat too much due to Kelvin effect above 400 Hz. Induction relays and meters that are pertubated by harmonic torques giving incorrect tripping and readings. The solutions that can be used to mitigate the harmonics effects on power quality and to protect the electrical and electronics equipments that by using harmonic filters and other mitigation techniques.