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A three-level three-power-channel hybrid converter with wide voltage range for renewable energy medium voltage DC systems

Author

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  • Nie, Jianglin
  • Meng, Linghui
  • Zhang, Hengpeng
  • Yang, Jiangpeng
  • Wu, Jingchi
  • Ma, Lan
  • Shu, Zeliang

Abstract

This paper presents a novel three-level, three-power-channel hybrid DC/DC converter tailored for renewable energy-based medium-voltage DC (MVDC) systems. The proposed architecture integrates two LLC channels and one phase-shifted bridge (PSB) channel to simultaneously achieve wide output voltage range, high power transfer efficiency, and strong zero-voltage switching (ZVS) capability under fixed-frequency operation. Unlike traditional PSB converters that require large output filters, the inherent ripple suppression of the proposed topology eliminates the need for bulky inductors, improving power density. The LLC channels deliver the main power efficiently with full-range ZVS, while the PSB channel handles a minor portion of power to extend the voltage gain. Additionally, the converter significantly reduces voltage and power stress on the switches and resonant components. A 1 kW prototype was built and tested, demonstrating a wide output voltage range of 100–190 V and a peak efficiency of 96.7 %, validating the converter's effectiveness and practicality for MVDC systems.

Suggested Citation

  • Nie, Jianglin & Meng, Linghui & Zhang, Hengpeng & Yang, Jiangpeng & Wu, Jingchi & Ma, Lan & Shu, Zeliang, 2025. "A three-level three-power-channel hybrid converter with wide voltage range for renewable energy medium voltage DC systems," Energy, Elsevier, vol. 330(C).
    • Handle: RePEc:eee:energy:v:330:y:2025:i:c:s0360544225025824
    DOI: 10.1016/j.energy.2025.136940
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    1. Miranda, Rodolfo Farías & Salgado-Herrera, Nadia Maria & Rodríguez-Hernández, Osvaldo & Rodríguez-Rodríguez, Juan Ramon & Robles, Miguel & Ruiz-Robles, Dante & Venegas-Rebollar, Vicente, 2022. "Distributed generation in low-voltage DC systems by wind energy in the Baja California Peninsula, Mexico," Energy, Elsevier, vol. 242(C).
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