电工技术学报  2021, Vol. 36 Issue (24): 5237-5249    DOI: 10.19595/j.cnki.1000-6753.tces.L90232
电力电子 |
电压调整单元双有源桥级联系统的阻抗匹配优化设计
农仁飚, 杨晓峰, 周兵凯, 李继成
北京交通大学电气工程学院 北京 100044
Optimal Design of Impedance Matching for Voltage Adjustment Unit-Dual Active Bridge Cascade System
Nong Renbiao, Yang Xiaofeng, Zhou Bingkai, Li Jicheng
School of Electrical Engineering Beijing Jiaotong University Beijing 100044 China
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摘要 具有电压调整单元(VAU)的双有源桥(DAB)直流变换器是解决宽电压输入时电感电流应力问题的方案之一,然而VAU-DAB存在级联稳定性问题。该文分别推导前级VAU输出阻抗模型和后级DAB输入阻抗模型,在复频域下根据禁区概念阻抗稳定性判据分析级联系统阻抗比,研究阻抗特性对级联系统稳定性的影响。由于VAU输出阻抗谐振峰值与DAB输入阻抗存在交叉点,使级联系统由于阻抗不匹配而导致系统电压振荡失稳。在此基础上,该文基于阻抗匹配准则,提出一种基于超前-滞后的阻抗优化调节器用以抑制VAU输出阻抗谐振尖峰,使级联系统阻抗比满足稳定性判据,提升了系统运行可靠性,并优化了电流应力。最后通过仿真验证了该文提出阻抗优化调节策略的有效性及可行性。
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农仁飚
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关键词 双有源桥电压调整稳定性分析输入/输出阻抗级联系统    
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 wordsDual active bridge    voltage adjustment    stability analysis    input/output impedance    cascade system   
收稿日期: 2020-07-04     
PACS: TM46  
基金资助:国家重点研发计划资助项目(2016YFE0131700)
通讯作者: 杨晓峰 男,1980年生,副教授,博士生导师,研究方向为多电平变换器技术、柔性直流输电技术、电力电子技术在轨道交通中的应用。E-mail: xfyang@bjtu.edu.cn   
作者简介: 农仁飚 男,1994年生,硕士,研究方向为双有源桥DC-DC变换器控制技术与应用。E-mail: 19121481@bjtu.edu.cn
引用本文:   
农仁飚, 杨晓峰, 周兵凯, 李继成. 电压调整单元双有源桥级联系统的阻抗匹配优化设计[J]. 电工技术学报, 2021, 36(24): 5237-5249. Nong Renbiao, Yang Xiaofeng, Zhou Bingkai, Li Jicheng. Optimal Design of Impedance Matching for Voltage Adjustment Unit-Dual Active Bridge Cascade System. Transactions of China Electrotechnical Society, 2021, 36(24): 5237-5249.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.L90232          https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I24/5237