TR2013-005

Generalized DC-link Voltage Balancing Control Method for Multilevel Inverters


    •  Deng, Y.; Teo, K.H.; Harley, R.G., "Generalized DC-link Voltage Balancing Control Method for Multilevel Inverters", IEEE Applied Power Electronics Conference and Exposition (APEC), DOI: 10.1109/APEC.2013.6520454, ISSN: 1048-2334, ISBN: 978-1-4673-4354-1, March 2013, pp. 1219-1225.
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      • @inproceedings{Deng2013mar,
      • author = {Deng, Y. and Teo, K.H. and Harley, R.G.},
      • title = {Generalized DC-link Voltage Balancing Control Method for Multilevel Inverters},
      • booktitle = {IEEE Applied Power Electronics Conference and Exposition (APEC)},
      • year = 2013,
      • pages = {1219--1225},
      • month = mar,
      • doi = {10.1109/APEC.2013.6520454},
      • issn = {1048-2334},
      • isbn = {978-1-4673-4354-1},
      • url = {http://www.merl.com/publications/TR2013-005}
      • }
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  • Research Areas:

    Electronics & Communications, Power


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SVPWM proposed in the paper: Location method for the reference vector.

This paper presents a general dc-link voltage balancing control method for multilevel inverters based on a generalized space vector pulse width modulation (SVPWM) scheme, with no requirements for additional auxiliary- power circuits. The SVPWM scheme generates all the available switching states and switching sequences based on two simple mappings, and calculates the duty cycles simply as for a two level SVPWM, thus independent of the level of the inverter. The optimal switching sequence and optimal duty cycles for dc-link voltage balancing control are provided in the paper. Because all the measured signals are instantaneous values, the dc-link voltage balancing control method in the paper is suitable for any load without any assumption on the output current waveforms. The dc-link voltage balancing control in the paper is effective even when the capacitances of the dc-link capacitors of the multilevel inverter are not strictly equal or the voltage of the dc source of the multilevel inverter is fluctuating. Simulation results for a five-level inverter are given.