一种混合模块型直流变压器冗余设计及控制策略

doi:10.19595/j.cnki.1000-6753.tces.L90128

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Abstract This paper proposes a hot standby redundant design and its control strategy for the hybrid phase-shifted and series resonant dual active bridge (PS-SRDAB) type dc transformer (DCT). To improve the reliability of the series resonant dual active bridge (SRDAB) of the DCT, a standby PSDAB power module is connected in parallel with it. In normal operation, the SRDAB and the standby phase-shifted dual active bridge (PSDAB) are operated simultaneously, and the transferred power ratio of the PSDABs and SRDABs is realized by controlling capacitor voltage on the high-voltage side. If the SRDAB has faults such as over-current, over-voltage, over-temperature and so on, the whole power is transferred by the PSDAB after the fault SRDAB is blocked. This paper analyzes the operation principle and characteristics of the hybrid modular DCT (HMDCT), establishes an average dynamic small signal model, and illustrates the operating stability with a traditional voltage closed-loop control strategy. The proposed redundant design method and its control strategy are verified by a experimental prototype.

Key words： DC transformer redundant design hot backup hybrid phase-shifted and series resonant dual active bridge (PS-SRDAB)

Received: 30 June 2020

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TM41

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	Articles by authors
	Zhang Hang
	Li Zixin
	Gao Fanqiang
	Zhao Cong
	Xu Fei

Cite this article:

Zhang Hang,Li Zixin,Gao Fanqiang等. A Redundant Design and Control Strategy of Hybrid Modular DC Transformer[J]. Transactions of China Electrotechnical Society, 2022, 37(2): 409-423.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90128 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I2/409

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