A Multiport Electric Energy Routing Scheme Applied to Battery Energy Storage System. (26th August 2021)

• Record Type: Journal Article
• Authors: Sha, Guanglin; Duan, Qing; Sheng, Wanxing; Pan, Aiqiang; Liu, Zhe; Ma, Chunyan; Zhao, Caihong; Teng, Jiaxun; Fu, Lumin; Zheng, Yi
• Other Names: Iqbal Kamran Academic Editor.
• Is Part Of: Journal of engineering. Volume 2021(2021)
• Publication Date: 2021-08-26
• Subjects: Engineering -- Periodicals; 620.005
• DOI: 10.1155/2021/6637926
• Languages: English
• ISSNs: 2314-4904

Abstract

Abstract : 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.