Submodule power losses balancing algorithms for the modular multilevel converter

Picas, R., Pou, J., Zaragoza, J., Watson, Alan James, Konstantinou, G., Ceballos, S. and Clare, Jon C. (2016) Submodule power losses balancing algorithms for the modular multilevel converter. In: 42nd Annual Conference of IEEE Industrial Electronics Society (IECON 2016), 24-27 Oct 2016, Florence, Italy.

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Tolerance and component aging can cause signif¬icant differences in the capacitance values of the submodules (SMs) in a modular multilevel converter (MMC). Depending on the modulation technique, capacitance mismatches may produce uneven switching transitions of the SMs, hence imbalances in the power losses that can lead to reliability problems. In this paper, a new algorithm that helps to achieve evenly distributed switching and conduction losses within the converter SMs is presented. The proposed algorithm is based on a modification of the common voltage balancing algorithms, balancing a weighted function of voltage and losses. Even distribution of power losses is achieved at the cost of slightly increasing the capacitor voltage ripples. The effectiveness of the strategy has been demonstrated by simulation results of a high-power grid-connected MMC.

Item Type: Conference or Workshop Item (Paper)
Additional Information: © 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Keywords: Modular multilevel converter, Power losses, Capacitor voltage ripples, Reliability improvement
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Electrical and Electronic Engineering
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Depositing User: Burns, Rebecca
Date Deposited: 08 Feb 2017 08:53
Last Modified: 04 May 2020 18:15

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