Abstract:
Three-phase multiplexing arm modular multilevel converter (TPMA-MMC) possesses cost-efficiency advantage by employing a pair of multiplexing arms. However, the narrow mul...Show MoreMetadata
Abstract:
Three-phase multiplexing arm modular multilevel converter (TPMA-MMC) possesses cost-efficiency advantage by employing a pair of multiplexing arms. However, the narrow multiplexing arm energy regulation period results in the limited modulation range [0.82, 1]. This article proposes a wide multiplexed period operation principle with the multiplexing arm energy regulation period being extended to one-fundamental period, and with which, it realizes to expand the modulation range to [0, 1]. Besides, based on it, the existing “overlap” period could also contribute to realize the multiplexing arm energy balance in one-third fundamental period. Therefore, the analysis of this new principle indicates that TPMA-MMC demonstrates some improved advantages. Compared to MMC, it reduces by 21.8% in submodule (SM) count, 28.9% in operation loss, and 39.9% in energy storage, which could result in lower construction cost, footprint, and higher efficiency and power density, and the proposed principle also permits TPMA-MMC to possess higher efficiency than that with the narrow range principle. Finally, the proposed wide multiplexed period operation principle and control scheme are verified by simulation and scale-down prototype experimental results.
Published in: IEEE Journal of Emerging and Selected Topics in Power Electronics ( Volume: 11, Issue: 5, October 2023)
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