三重移相控制的DAB变换器多目标统一优化控制策略
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湖南工业大学

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基金项目:

国家自然科学基金(51807058);湖南省自然科学基金(2020JJ6082)


Multi-objective Unified Optimal Control Strategy for DAB Converter With Triple-Phase-Shift Control
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Affiliation:

Hunan University of Technology

Fund Project:

Natural Science Foundation of China (No.51807058); Natural Science Foundation of Hunan Province (No. 2020JJ6082)

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    摘要:

    针对双有源桥变换器存在电流应力大、全部开关管软开关实现困难以及动态响应慢的问题,提出一种基于三重移相控制的多目标统一优化控制策略。分析三重移相控制正向功率流的全局模式,比选出其中三种高效率模式并建立电流应力和软开关解析模型。结合模型,采用成本函数优化方程推导不同模式下的最优移相比组合和最小电流应力,使开关管运行在零电压开关功率约束范围内。同时在效率优化过程中引入虚拟功率分量,构建小信号模型并阐明不同状态变量的小扰动对输出电压的影响较小。实验结果表明,所提控制策略可以在全功率范围内降低双有源桥变换器的电流应力、且使所有开关管实现零电压开通,同时还能够提高输出电压的动态性能。

    Abstract:

    To solve the problems of large current stress, difficult soft switching of all switches and slow dynamic response of dual active bridge convert-ers, a multi-objective unified optimal control strategy based on triple-phase-shift control is proposed. The forward power flow global mode of triple-phase-shift control is analyzed, and three high-efficiency modes are selected to establish the analytical models of current stress and soft switching. Combined with the model, the optimal phase-shift ratio combination and the minimum current stress in different modes are derived by using the cost function optimization equation, which makes switches operate within the zero-voltage-switching power constraint range. At the same time, the virtual power component is introduced in the process of efficiency optimization. The small-signal model is constructed and the influence of small disturbance of different state variables on the output voltage is clarified. The experimental results show that the proposed control strategy can not only reduce the current stress of the dual active bridge converter, make all switches zero-voltage-switching, but also improve the stability of the output voltage in the full power range.

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  • 收稿日期:2021-09-08
  • 最后修改日期:2021-10-18
  • 录用日期:2021-10-31
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