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

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...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2021-03, Vol.36 (3), p.2864-2874
Main Authors: Liang, Gaowen, Tafti, Hossein Dehghani, Farivar, Glen G., Pou, Josep, Townsend, Christopher D., Konstantinou, Georgios, Ceballos, Salvador
Format: Article
Language:English
Subjects:
Active power disparity
Batteries
battery energy storage system (BESS)
Capacitors
Converters
Electric power distribution
Energy sources
Energy storage
Legged locomotion
Mathematical analysis
modular multilevel converter (MMC)
Modular multilevel converters
Modular systems
operation limit
Power distribution
Storage systems
Topology
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Summary: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.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2020.3014739