Analytical Derivation of Intersubmodule Active Power Disparity Limits in Modular Multilevel Converter-Based Battery Energy Storage Systems

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URI: https://hdl.handle.net/11556/4259
ISSN: 0885-8993
DOI: 10.1109/TPEL.2020.3014739
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2021-03
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Abstract
Due to a dramatic increase in grid-connected renewable energy resources, energy storage systems are interesting and important for future power systems, among which the modular multilevel converter (MMC)-based battery energy storage systems (BESSs) are one of the most modular, efficient, and flexible topologies. Uneven active power distribution among submodules (SMs) in the arms of an MMC-based BESS is necessary for certain applications. The main contribution of this article is to present a general analysis of the inter-SM active power disparity problem which incorporates the inherent operational constraints of the MMC converter. An analytical method to derive inter-SM active power disparity limits is introduced. The proposed analysis can help facilitate the design of MMC-based BESS for applications such as recycled batteries and hybrid battery chemistries, which can both require significant inter-SM active power disparity. The analysis formulates a criteria vector and criterion value that describes whether an MMC-based BESS is capable of supplying demanded output powers while subject to inter-SM active power disparity. Simulation and experimental results are obtained on a single-phase system with varying numbers of SMs per arm, which verifies the feasibility and generality of the proposed analytical method.
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Publisher Copyright: © 1986-2012 IEEE.
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Active power disparity , battery energy storage system (BESS) , modular multilevel converter (MMC) , operation limit , Electrical and Electronic Engineering , SDG 7 - Affordable and Clean Energy
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journal article
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Liang , G , Tafti , H D , Farivar , G G , Pou , J , Townsend , C D , Konstantinou , G & Ceballos , S 2021 , ' Analytical Derivation of Intersubmodule Active Power Disparity Limits in Modular Multilevel Converter-Based Battery Energy Storage Systems ' , IEEE Transactions on Power Electronics , vol. 36 , no. 3 , 9160892 , pp. 2864-2874 . https://doi.org/10.1109/TPEL.2020.3014739