Comparison of bipolar sub-modules for the alternate arm converter
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2016-12-21
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IEEE Computer Society
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Research on dc-fault tolerant multilevel converters has gained noticeable attention over recent years. The alternate arm converter (AAC) is one of such emerging multilevel converter topologies, and a hybrid topology of the two-level converter and the modular multilevel converter (MMC). Bipolar sub-modules (SMs) that can produce both positive and negative voltages are the building blocks of the AAC. This paper analyses the operation of an AAC with the full-bridge SM (FB-SM) and the cross-connected SM (CC-SM). The conduction and switching losses of the two SM configurations are evaluated and compared, in order to identify the suitability of CC-SM for AACs and its performance compared to the FB-SM. The CC-SM with identical semiconductor devices has reduced losses compared to the CC-SM with higher rated devices in the cross-connected path. It is concluded that the CC-SM does not offer advantages in the losses, construction, and application to the AAC, compared to FB-SM.
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Wickramasinghe , H R , Konstantinou , G , Pou , J , Picas , R , Ceballos , S & Agelidis , V G 2016 , Comparison of bipolar sub-modules for the alternate arm converter . in Proceedings of the IECON 2016 - 42nd Annual Conference of the Industrial Electronics Society . , 7793031 , IECON Proceedings (Industrial Electronics Conference) , IEEE Computer Society , pp. 6482-6487 , 42nd Conference of the Industrial Electronics Society, IECON 2016 , Florence , Italy , 24/10/16 . https://doi.org/10.1109/IECON.2016.7793031
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