Electric Power Systems Harmonics - Identification and Measurements

摘要: The presence of non-linear loads and the increasing number distributed generation power systems (DGPS) in electrical grids contribute to change characteristics voltage current waveforms systems, which differ from pure sinusoidal constant amplitude signals. Under these conditions advanced signal processing techniques are required for accurate measurement quantities. impact has been during last decades. Such loads, introduce non-sinusoidal consumption patterns (current harmonics), can be found rectification front-ends motor drives, electronic ballasts discharge lamps, personal computers or appliances. Harmonics mean existence signals, superimposed on fundamental signal, whose frequencies integer numbers frequency. electric utility companies should supply their customers with a having frequency equal frequency, 50/60 Hz, magnitude. harmonics waveform leads distorted current, becomes it not be. Thus study system is an important subject engineers. problem new problem; noticed since establishment ac generators, where were observed thirtieth 20th century [2]. Concern distortion shared by all engineers order establish right balance between exercising control keeping under control. There need early co-ordination decisions interested parties, achieve acceptable economical solutions discussed manufacturers, communication authorities [1]. Electricity normally abrogate responsibility harmonic matters introducing standards recommendations limitation levels at points common coupling consumers.