A Multiport Electric Energy Routing Scheme Applied to Battery Energy Storage System

In this paper, the research status of topology and control strategy of energy storage grid-connected system is analyzed, and aiming at the working characteristics of the repurposed battery, a cascade power electronic transformer (CPET) with independent DC output is proposed. The working principle of...

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Bibliographic Details
Published in:Journal of engineering (Cairo, Egypt) Egypt), 2021-08, Vol.2021, p.1-15
Main Authors: Sha, Guanglin, Duan, Qing, Sheng, Wanxing, Pan, Aiqiang, Liu, Zhe, Ma, Chunyan, Zhao, Caihong, Teng, Jiaxun, Fu, Lumin, Zheng, Yi
Format: Article
Language:English
Subjects:
Batteries
Decoupling
Energy storage
Lithium
Reactive power
Renewable resources
State of charge
Topology
Voltage converters (DC to DC)
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Summary:In this paper, the research status of topology and control strategy of energy storage grid-connected system is analyzed, and aiming at the working characteristics of the repurposed battery, a cascade power electronic transformer (CPET) with independent DC output is proposed. The working principle of current fed isolated bidirectional DC-DC converter (CF-IBDC) and cascaded H-bridge (CHB) is analyzed, and the decoupling control strategy is designed. In this paper, a hierarchical control strategy is designed for the repurposed battery energy storage (RBES) grid-connected system based on CPET, which consists of three layers: energy layer, power layer, and state of charge (SOC) layer. The energy layer responds to active and reactive power scheduling instructions, the power layer controls the grid-connected current and tracks the grid voltage, and the SOC layer equates the charged state of repurposed batteries. A 3 MVA/12 kV three-phase grid-connected simulation system was established, and a 1 kW single-phase system experiment platform was designed. The simulation and experimental results can verify the correctness of the theoretical analysis and the feasibility of the control strategy.
ISSN:2314-4904
2314-4912
2314-4912
DOI:10.1155/2021/6637926