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Title: Optimal pulsewidth modulation of a dual three-level inverter system operated from a single DC link
Authors: Boller, T.
Holtz, J.
Rathore, A.K. 
Keywords: Common-mode voltage
medium-voltage ac drives
multilevel inverters
optimal pulsewidth modulation (PWM)
total harmonic distortion (THD)
Issue Date: 2012
Citation: Boller, T., Holtz, J., Rathore, A.K. (2012). Optimal pulsewidth modulation of a dual three-level inverter system operated from a single DC link. IEEE Transactions on Industry Applications 48 (5) : 1610-1615. ScholarBank@NUS Repository.
Abstract: Operating a dual three-level inverter system from a single dc link circuit is an economic solution for generating five-level output voltage waveforms and to double the output power compared to a single three-level inverter. Such an inverter system is used for feeding a drive motor with open stator windings. A mechanism is then required to reduce the common-mode voltage components of the motor voltages. This paper describes an offline optimization method that minimizes both the harmonic distortion of the motor currents and the common-mode voltage components. The optimization permits reduction of the switching frequency to a very low value of 200 Hz without compromising the harmonic distortion. High performance operation of the drive system at low switching frequency is experimentally demonstrated. © 1972-2012 IEEE.
Source Title: IEEE Transactions on Industry Applications
ISSN: 00939994
DOI: 10.1109/TIA.2012.2210016
Appears in Collections:Staff Publications

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