Title :
A novel approach to the generation and optimization of three-level PWM wave forms for induction motor inverters
Author :
Velaerts, B. ; Mathys, P. ; Tatakis, E. ; Bingen, G.
Author_Institution :
Dept. of Electron. Microelectron. & Telecommun., Univ. Libre de Bruxelles, Belgium
Abstract :
The application of three-level pulsewidth modulation (PWM) to voltage source inverters feeding three-phase induction motors is considered. A subharmonic modulation method using two modulating waves is introduced. It is particularly well adapted to the elimination of specific harmonic bands. Systematic optimization of precalculated waveforms with respect to loss factor, shows that three-level PWM is very well suited to harmonic reduction. Transient behavior is discussed. It is concluded that three-level PWM yields significant improvements compared with two-level PWM, especially in high-power (gate-turn-off) GTO applications where the high DC link voltage requires a series connection of the switches.<>
Keywords :
induction motors; invertors; pulse width modulation; thyristor applications; DC link voltage; GTO applications; for induction motor inverters; harmonic bands; loss factor; optimization; series connection; subharmonic modulation; three-level PWM; three-phase induction motors; thyristor applications; voltage source inverters; AC motors; Frequency; Induction generators; Power system harmonics; Pulse width modulation; Pulse width modulation inverters; Sampling methods; Space vector pulse width modulation; Turning; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE
Conference_Location :
Kyoto, Japan
DOI :
10.1109/PESC.1988.18269
