Closed-loop discontinuous modulation technique for capacitor voltage ripples and switching losses reduction in modular multilevel converters

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URI: https://hdl.handle.net/11556/4514
ISSN: 0885-8993
DOI: 10.1109/TPEL.2014.2368055
Publication date
2015-09-01
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Abstract
In this paper, a new discontinuous modulation technique is presented for the operation of the modular multilevel converter (MMC). The modulation technique is based on adding a zero sequence to the original modulation signals so that the MMC arms are clamped to the upper or lower terminals of the dc-link bus. The clamping intervals are controlled according to the absolute value of the output current to minimize the switching losses of the MMC. A significant reduction in the capacitor voltage ripples is achieved, especially when operating with low modulation indices. Furthermore, a circulating current control strategy suitable for this modulation technique is also proposed. Simulation and experimental results under various operating points are reported along with evaluation and comparison results against a conventional carrier-based pulse width modulation method.
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Publisher Copyright: © 2015 IEEE.
Keywords
Capacitor voltage ripples , Circulating current control , Discontinuous modulation , Modular multilevel converter , Electrical and Electronic Engineering
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journal article
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Picas , R , Ceballos , S , Pou , J , Zaragoza , J , Konstantinou , G & Agelidis , V G 2015 , ' Closed-loop discontinuous modulation technique for capacitor voltage ripples and switching losses reduction in modular multilevel converters ' , IEEE Transactions on Power Electronics , vol. 30 , no. 9 , 6948374 , pp. 4714-4725 . https://doi.org/10.1109/TPEL.2014.2368055