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Titolo:
Opportunities for harmonic cancellation with carrier-based PWM for two-level and multilevel cascaded inverters
Autore:
Holmes, DG; McGrath, BP;
Indirizzi:
Monash Univ, Dept Elect & Comp Syst Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 Engn, Clayton, Vic 3168, Australia
Titolo Testata:
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
fascicolo: 2, volume: 37, anno: 2001,
pagine: 574 - 582
SICI:
0093-9994(200103/04)37:2<574:OFHCWC>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
STRATEGIES;
Keywords:
analytic solution; harmonic cancellation; multilevel cascaded converters; pulsewidth modulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
7
Recensione:
Indirizzi per estratti:
Indirizzo: Holmes, DG Monash Univ, Dept Elect & Comp Syst Engn, Clayton, Vic 3168, Australia Monash Univ Clayton Vic Australia 3168 on, Vic 3168, Australia
Citazione:
D.G. Holmes e B.P. McGrath, "Opportunities for harmonic cancellation with carrier-based PWM for two-level and multilevel cascaded inverters", IEEE IND AP, 37(2), 2001, pp. 574-582

Abstract

Pulsewidth modulation (PWM) strategies have been the subject of many yearsof research effort, and the merits of the various alternatives investigated have been argued extensively. In general, it is now accepted that naturalor asymmetrical regular sampled PWM with a third harmonic injected or a space-vector-centered reference waveform gives the best harmonic performance,with discontinuous modulation having some advantages for higher modulationratios. This paper uses a general analytical solution for carrier-based PWM to mathematically identify the harmonic cancellation that occurs in various PWM implementations and converter topologies. This solution provides a formal justification for the superiority of natural and asymmetrical regularsampling techniques in eliminating half of their sideband harmonics simplyby virtue of their phase Leg switching, Then, the use of fundamental reference phase shifting between phase legs to create single- and three-phase 1-1 output voltages is reviewed, and the harmonic cancellation that occurs isidentified. One significant result from this analysis is the realization that an odd/triplen carrier/fundamental ratio has no intrinsic harmonic benefit, contrary to the generally accepted wisdom, Finally, opportunities for harmonic elimination in multilevel cascaded inverter systems by carrier phase shifting are investigated, and the optimum phase shift is identified.

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Documento generato il 14/07/20 alle ore 07:05:49