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Theoretical Analysis of Harmonics in PWM Output Waveform of Multilevel Inverters
Author(s) -
Obara Hidemine,
Oguri Hiroshi,
Sato Yukihiko
Publication year - 2015
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.22713
Subject(s) - harmonics , emi , harmonic , pulse width modulation , waveform , voltage , power (physics) , electronic engineering , harmonic analysis , control theory (sociology) , engineering , computer science , electrical engineering , electromagnetic interference , physics , acoustics , control (management) , quantum mechanics , artificial intelligence
SUMMARY Multilevel inverters have very attractive features, such as lower harmonics in the output, lower EMI, and reduction of the required voltage rating of power semiconductor devices. Among them, lower harmonics in the output can reduce the volume of the output harmonic filter and additional losses caused by the harmonics. Therefore, multilevel inverters are expected to realize higher power density and higher efficiency. In this paper, as a basis of the quantitative investigation of these features, the harmonics in the PWM output voltage of multilevel inverters are analyzed theoretically. As an application of the theoretical results, the usefulness of the theoretical results is verified by the prediction of the harmonic contents of the load current.