Capacitor Voltage Balancing Control for a Novel 5-Level Dual Active Bridge Converter
Capacitor Voltage Balancing Control for a Novel 5-Level Dual Active Bridge Converter
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DOI：
10.1109/tpel.2022.3194960
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发表时间：
2022-12
影响因子：
6.7
通讯作者：
Fan Zhang;Yu Ren;Xu Yang;Wenjie Chen;Huitao Wu
中科院分区：
文献类型：
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作者：
Fan Zhang;Yu Ren;Xu Yang;Wenjie Chen;Huitao Wu
多电平技术是提高直流固态变压器成本效益和功率密度的一种有吸引力的解决方案。提出了一种新颖的五电平(5L)双有源桥(DAB)变换器拓扑。通过在原边堆叠两个中点钳位(NPC)转换器，该拓扑可以使传统的两电平(2L)DAB转换器的输入直流母线电压增加四倍。此外，通过分析5L-DAB变流器的工作原理，提出了一种电压均衡控制方法。借助于电压均衡法，5L-DAB转换器中四个串联的直流母线电容器的电压可以实现主动平衡，保证了所有半导体开关的安全工作电压。在此基础上，通过理论分析，得出了电压均衡法的工作范围。最后，通过实验验证了所提出的变流器拓扑结构和电压均衡方法的性能。
Multilevel technology is an attractive solution to increase the cost effectiveness and power density of dc solid state transformers. In this article, a novel five-level (5L) dual active bridge (DAB) converter topology is proposed. By stacking two neutral-point-clamped (NPC) converters at the primary side, the proposed topology could quadruple the input dc-bus voltage of a conventional two-level (2L) DAB converter. Besides, by analyzing the working principle of the 5L-DAB converter, a voltage balancing control method is carried out. With the aid of the voltage balancing method, voltages of the four series-connected dc-bus capacitors in the 5L-DAB converter can be actively balanced, guaranteeing safe operation voltage for all the semiconductor switches. After that, the operation range of the proposed voltage balancing method is derived by theoretical analysis. Finally, the performance of the proposed converter topology and voltage balancing method have been verified by experimental results.