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An efficient and low-cost DMPPT approach for photovoltaic submodule based on multi-port DC converter

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  • Zhang, Tao
  • Jiang, Jiahui
  • Chen, Daolian

Abstract

Solar energy is one of the most promising energy types, but photovoltaic (PV) mismatches have several negative effects. Finding an efficient and low-cost method to reduce or eliminate the power loss caused by the mismatch in PV power generation systems is necessary. In this paper, we propose a PV submodule-distributed maximum power point tracking (DMPPT) scheme based on a multi-port DC converter. In-depth analysis and research are performed on the PV model and mismatch characteristics, the PV module voltage equalization (VE) strategy, and implementation with the multi-port buck–boost converter. We discuss the trade-off between true DMPPT and VE on control overhead and tracking accuracy, and a detailed derivation is created to illustrate the differences between them. The VE can reduce the cost and complexity of the system at the expense of a small PV energy capture. The proposed implementation reduces the number of semiconductor components and current sensors, which is conducive to the integrated design of the hardware. A prototype based on a multi-port buck–boost converter for a 36 V/200 W PV module was designed and built. The feasibility and progress of the proposed scheme were verified through experiments.

Suggested Citation

  • Zhang, Tao & Jiang, Jiahui & Chen, Daolian, 2021. "An efficient and low-cost DMPPT approach for photovoltaic submodule based on multi-port DC converter," Renewable Energy, Elsevier, vol. 178(C), pages 1144-1155.
    • Handle: RePEc:eee:renene:v:178:y:2021:i:c:p:1144-1155
    DOI: 10.1016/j.renene.2021.06.134
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    References listed on IDEAS

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