期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 68, 期 12, 页码 12250-12261出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3044780
关键词
Capacitors; Batteries; Voltage control; Multilevel converters; Topology; Power system harmonics; Modulation; Battery energy storage system (BESS); capacitor voltage ripple reduction; isolated three-port converter; modular multilevel converter (MMC)
资金
- National Natural Science Foundation of China [51741703]
This article introduces a novel battery integration method using isolated three-port converters to connect battery packs with submodules, achieving power balance and reducing capacitor voltage ripple. Additionally, the three-port converters provide power channels for fundamental power fluctuation of arms, further reducing capacitor voltage ripple.
Modular multilevel converter with integrated battery energy storage system has been verified as a better choice for large-scale battery energy storage system. However, battery power and its unbalanced distribution in submodules lead to significant increase of capacitor voltage ripple. Larger submodule capacitance is required to maintain the ripple within reasonable limits, increasing the cost and volume of the system. To address the problem, this article proposes a novel battery integration method. Each battery pack is connected with two submodules that belong to upper and lower arm, respectively, through an isolated three-port dc-dc converter. The proposed method can ensure the power balance between upper and lower arm to eliminate fundamental circulating current and reduce capacitor voltage ripple. Three-port converters provide power channels for the fundamental power fluctuation of arms; thus, capacitor voltage ripple is further reduced. Then, the small-signal model of the proposed structure is built, and the control strategy is designed to realize both capacitor voltage ripple reduction and battery power control. Finally, a downscaled prototype is built and detailed experiment results verify the effectiveness of the proposed battery integration method and control strategy.
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