Soft-switching and low conduction loss current-fed isolated bidirectional DC–DC converter with PWM plus dual phase-shift control
Soft-switching and low conduction loss current-fed isolated bidirectional DC–DC converter with PWM plus dual phase-shift control
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DOI：
10.1007/s43236-020-00074-y
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发表时间：
2020-03
影响因子：
1.4
通讯作者：
Zhao Zhang;Shaojun Xie;Zhiying Wu;Jinming Xu
中科院分区：
文献类型：
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作者：
Zhao Zhang;Shaojun Xie;Zhiying Wu;Jinming Xu
在电池储能系统中，电池和直流母线电压变化很大。这使得电池存储转换器很难在所有情况下保持高效率。本文提出了一种电流馈送隔离式双向 DC-DC 转换器。该转换器包含两个串联变压器、电池侧的两个传统电流馈电半桥和直流母线侧的两个半桥。采用PWM加等占空比双相移调制和电压匹配控制，确保所有开关管的ZVS和低导通损耗。本文全面分析了全工作范围内所有工作模式的平均和回流功率传输方程以及软开关条件。然后根据上述分析提出了六种推荐模式。此外，还讨论了控制方案和硬件设计指南。最后，通过实验结果验证了上述理论分析和控制策略。
In battery energy storage systems, the battery and DC bus voltages vary greatly. This makes it difficult for the battery storage converter to maintain high efficiencies under all circumstances. A current-fed isolated bidirectional DC–DC converter is presented in this paper. This converter contains two series transformers, two conventional current-fed half-bridges at the battery side and two half-bridges at the DC bus side. PWM plus dual phase shift modulation with equal duty cycles and voltage-matched control is applied to ensure ZVS of all the switches and low conduction losses. The average and backflow power transmission equations and soft-switching conditions for all of the operation modes in the full operation range are analyzed comprehensively in this paper. Then six recommended modes are addressed based on the above analyses. Moreover, the control scheme and hardware design guidelines are addressed. Finally, the above theoretical analyses and control strategy are verified by experimental results.