Sharing Voltage and Current of an Input-Series–Output-Parallel Boost-LLC Converter

Bo Zhang, Jin Huang, Yongfeng Song (), Xinbo Liu, Jiahui Ren, Chengwei Kang, Yingtao Ma, Shijie Sun and Lijun Diao ()
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Bo Zhang: Locomotive and Car Research Institute, China Academy of Railway Sciences Corporation Ltd., Beijing 100094, China
Jin Huang: Locomotive and Car Research Institute, China Academy of Railway Sciences Corporation Ltd., Beijing 100094, China
Yongfeng Song: Locomotive and Car Research Institute, China Academy of Railway Sciences Corporation Ltd., Beijing 100094, China
Xinbo Liu: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Jiahui Ren: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China
Chengwei Kang: CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130022, China
Yingtao Ma: Locomotive and Car Research Institute, China Academy of Railway Sciences Corporation Ltd., Beijing 100094, China
Shijie Sun: CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130022, China
Lijun Diao: School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Energies, 2022, vol. 15, issue 19, 1-16

Abstract: Modular input-series–output-parallel (ISOP) converters are very suitable for high-voltage and high-power applications. In order to ensure the normal operation of ISOP converters, it is necessary to realize the input-voltage and output-current equalization of each submodule. However, there are few studies on the input-voltage and output-current equalization performance of the ISOP system. In this paper, the input-voltage and output-current equalization characteristics of a Boost + LLC modular ISOP converter are studied based on the small-signal model. In this paper, the small-signal model of an ISOP system is first established, and then the input-voltage and output-current equalization performance of the ISOP system under the condition of inconsistent submodule parameters are analyzed. Finally, simulations and experiments are reported to verify the results. The experimental results show that the ISOP system composed of a Boost + LLC cascaded module has excellent voltage and current self-equalization performance.

Keywords: input-series–output-parallel; input-voltage equalizing; output-current equalizing; LLC resonant converter (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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