研究目的
To propose a new distributed MPPT (DMPPT) scheme using a multi-winding forward-based converter to maximize energy capture from partially shaded PV strings by enabling module-level maximum power extraction.
研究成果
The proposed CBC-DMPPT scheme effectively maximizes the output power of PV strings under partial shading conditions by minimizing the power processed through the converter and maintaining high MPPT efficiencies at module-levels. The system efficiency is significantly improved compared to existing topologies.
研究不足
The study is focused on small-scale PV systems and may not directly scale to larger arrays without modifications. The LMPPT mode requires disconnecting the PV string from the central converter, which could be a challenge for large-scale systems.
1：Experimental Design and Method Selection:
The study employs a multi-winding forward-based converter as a current balancing DPP converter to implement DMPPT technology at module-level. The converter operates in two modes: local MPPT mode and current balancing mode.
2：Sample Selection and Data Sources:
A PV string including three modules is considered for simulation and experimental validation. The electrical parameters of each module are specified.
3：List of Experimental Equipment and Materials:
The setup includes a multi-winding forward converter, PV module simulator, sensor boards, ARM board, central converter (DC-DC boost converter), power supplies, and an oscilloscope.
4：Experimental Procedures and Operational Workflow:
The converter is tested under partial shading conditions to track new MPPs at module-level in local MPPT mode and then switches to current balancing mode to regulate module voltages close to their MPPs.
5：Data Analysis Methods:
The performance is evaluated based on MPPT efficiency, processed power by the converter, and system efficiency under various shading conditions.
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