Title :
Synchronous Optimal Pulsewidth Modulation for Low-Switching-Frequency Control of Medium-Voltage Multilevel Inverters
Author :
Rathore, Akshay K. ; Holtz, Joachim ; Boller, Till
Author_Institution :
Univ. of Wuppertal, Wuppertal, Germany
fDate :
7/1/2010 12:00:00 AM
Abstract :
This paper presents the mechanism and details of synchronous optimal pulsewidth modulation (PWM) generation for control of medium-voltage induction motor drives using multilevel inverters at low switching frequency. Multilevel inverters allow operation at multiple of dc-link voltage and reduce the total harmonic distortion (THD). Synchronous optimal PWM control permits setting the maximum switching frequency to a low value without compromising THD. Low switching frequency reduces the switching losses of the power semiconductor devices. An optimal control procedure is explained in detail. The performances of three- and five-level inverter topologies are compared. The experimental results of a five-level inverter drive using optimal PWM control are presented.
Keywords :
PWM invertors; frequency control; harmonic distortion; induction motor drives; machine control; optimal control; power semiconductor devices; switching; PWM generation; dc-link voltage; low-switching-frequency control; medium-voltage induction motor drives; medium-voltage multilevel inverters; power semiconductor devices; switching losses; synchronous optimal PWM control; synchronous optimal pulsewidth modulation; total harmonic distortion; Medium-voltage drives; multilevel inverters; optimization; synchronous optimal pulsewidth modulation (PWM);
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2010.2047824