电压调整单元双有源桥级联系统的阻抗匹配优化设计

doi:10.19595/j.cnki.1000-6753.tces.L90232

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Abstract The dual active bridge (DAB) DC-DC converter with voltage adjustment unit (VAU) is one of the solutions to reduce current stress in wide input voltage range. However, the impedance stability of the VAU-DAB cascade system is poor. This paper firstly deduces the output impedance model of the VAU and the input impedance model of the DAB, and analyzes the impedance ratio in the complex frequency domain according to the impedance stability criterion concept of the forbidden region. Because of the existing crossing point between the resonance peak of the VAU output impedance amplitude curve and DAB input impedance, the cascaded system is likely to cause system voltage oscillation instability due to impedance mismatch. Then, according to the impedance matching criteria, an impedance optimization controller based on lead-lag is proposed. By suppressing the convexity of the VAU output impedance, the cascade system meets the stability criterion, the system reliability is improved, and the current stress is reduced. Finally, the simulation verifies the proposed strategy.

Key words： Dual active bridge voltage adjustment stability analysis input/output impedance cascade system

Received: 04 July 2020

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TM46

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	Articles by authors
	Nong Renbiao
	Yang Xiaofeng
	Zhou Bingkai
	Li Jicheng

Cite this article:

Nong Renbiao,Yang Xiaofeng,Zhou Bingkai等. Optimal Design of Impedance Matching for Voltage Adjustment Unit-Dual Active Bridge Cascade System[J]. Transactions of China Electrotechnical Society, 2021, 36(24): 5237-5249.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L90232 OR https://dgjsxb.ces-transaction.com/EN/Y2021/V36/I24/5237

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