Submodule power losses balancing algorithms for the modular multilevel converter
Document typeConference report
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Rights accessOpen Access
Tolerance and component aging can cause significant 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.
CitationPicas, R., Pou, J., Zaragoza, J., Watson, A., Konstantinou, G., Ceballos, S., Clare, J. Submodule power losses balancing algorithms for the modular multilevel converter. A: Annual Conference of the IEEE Industrial Electronics Society. "Proceedings of the IECON2016: 42nd annual conference of the Industrial Electronics Society: Florence (Italy), October 24-27, 2016". Florence: Institute of Electrical and Electronics Engineers (IEEE), 2016, p. 5064-5069.