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Optimizing power allocation: A flexible power point tracking method for over-modulation problem in cascaded H-bridge PV systems

Author

Listed:
  • Zhu, Zexuan
  • Li, Xingshuo
  • Yang, Yongheng
  • Lin, Dingyi
  • Zhou, Shaoze
  • Sun, Yichao
  • Wang, Wei

Abstract

As the penetration level of grid-connected photovoltaic (PV) systems increases, cascaded H-bridge (CHB) inverters have gained widespread adoption for direct grid integration due to their superior scalability and modularity. However, PV power mismatches caused by aging, irradiance difference, or damage can lead to over-modulation, resulting in grid current distortion. To enhance the operational range of CHB inverters, this paper proposes a flexible power point tracking (FPPT) method that resolves over-modulation through optimal PV power allocation. Simulations and experiments were conducted on a 2.4 kW multi-string grid-connected PV system, with results demonstrating the method’s effectiveness in preventing over-modulation during PV power mismatch conditions.

Suggested Citation

  • Zhu, Zexuan & Li, Xingshuo & Yang, Yongheng & Lin, Dingyi & Zhou, Shaoze & Sun, Yichao & Wang, Wei, 2026. "Optimizing power allocation: A flexible power point tracking method for over-modulation problem in cascaded H-bridge PV systems," Renewable Energy, Elsevier, vol. 256(PH).
    • Handle: RePEc:eee:renene:v:256:y:2026:i:ph:s0960148125022293
    DOI: 10.1016/j.renene.2025.124565
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