Control of dc capacitor voltages in diode-clamped multilevel inverter using bidirectional buck-boost choppers

Shukla, A., Ghosh, A., & Joshi, A. (2012) Control of dc capacitor voltages in diode-clamped multilevel inverter using bidirectional buck-boost choppers. IET Power Electronics, 5(9), pp. 1723-1732.

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The dc capacitors voltage unbalancing is the main technical drawback of a diode-clamped multilevel inverter (DCMLI), with more than three levels. A voltage-balancing circuit based on buck–boost chopper connected to the dc link of DCMLI is a reliable and robust solution to this problem. This study presents four different schemes for controlling the chopper circuit to achieve the capacitor voltages equalisation. These can be broadly categorised as single-pulse, multi-pulse and hysteresis band current control schemes. The single-pulse scheme does not involve faster switching actions but need the chopper devices to be rated for higher current. The chopper devices current rating can be kept limited by using the multi-pulse scheme but it involves faster switching actions and slower response. The hysteresis band current control scheme offers faster dynamics, lower current rating of the chopper devices and can nullify the initial voltage imbalance as well. However, it involves much faster switching actions which may not be feasible for some of its applications. Therefore depending on the system requirements and ratings, one of these schemes may be used. The performance and validity of the proposed schemes are confirmed through both simulation and experimental investigations on a prototype five-level diode-clamped inverter.

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11 citations in Scopus
6 citations in Web of Science®
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ID Code: 61608
Item Type: Journal Article
Refereed: Yes
Keywords: capacitors; electric current control; diodes; choppers (circuits); voltage control; power convertors; invertors
DOI: 10.1049/iet-pel.2012.0237
ISSN: 1755-4535
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: © The Institution of Engineering and Technology 2012.
Deposited On: 01 Aug 2013 04:12
Last Modified: 02 Aug 2013 03:43

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