Abstract
In recent years, one of the most frightening criteria in power system is the generation of harmonics, due to the advancement in power semiconductor devices. Today most of the commercial, residential and industrial loads include advanced semiconductor technology and the utility of these non-linear loads results in harmonics generation on consumer’s premises. These harmonics plays a vital role in polluting the power quality of a distribution network by introducing losses which results in the failure of distribution side electrical equipment like transformer, protection, measuring devices, distribution feeders and so on. Hence to enhance the power quality, harmonic mitigation technique should be implemented in a distribution network. This paper surveys about the availability of various harmonic mitigation techniques with the analysis of its merits and demerits.
Highlights
Electricity plays a major role in the day to day life of each and every citizen of the world
In order to fulfil the needs of every consumer, it is necessary that a power utility company should supply a quality power with fundamental voltage and current waveform of specified frequency range [1]
Let us see the definition for harmonics as per IEEE 519 -1992 regulation, “Harmonic is defined as a voltage or current waveform that superimposed with the sinusoidal current or voltage waveform with an integral multiple of frequency which is higher than that of the fundamental frequency”
Summary
Electricity plays a major role in the day to day life of each and every citizen of the world. Most of the power electronic devices and converters are non-linear in nature When these non-linear devices are utilised as loads in a system, they generates non-sinusoidal voltage and current waveforms. This nonsinusoidal waveform injects harmonics in the system that tries to interact with the impedance of the distribution system which in turn distort the voltage and current waveforms at customer end. Yellow and Blue colour waveforms are sinusoidal waveform but they are with higher order harmonics of 150 Hz and 250 Hz respectively They indicate the 3rd and 5th order harmonic propagated in the system because of non-linear loads. Part 4 deals with various harmonic mitigation techniques followed by comparison of techniques in part 5 and conclusion in part 6
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