研究目的
To propose a new diffusion charge compensation strategy for power balancing in capacitor-less photovoltaic modules during partial shading, eliminating the need for bypass diodes and external storage devices, and to validate its effectiveness through simulation and experimental testing.
研究成果
The proposed DCC strategy effectively mitigates the partial shading effect in PV arrays by utilizing the inherent diffusion capacitance of modules for power balancing, eliminating the need for bypass diodes and external storage devices. It achieves higher conversion efficiency (nearly 98%) and simplifies the operation of MPPTs by forming single maxima in the characteristics curves during partial shading.
研究不足
The study is limited to specific types of PV modules (poly-crystalline and BSR based) and may not account for all possible shading scenarios in real-world applications. The experimental validation is conducted under controlled conditions, and the scalability of the DCC strategy to larger PV arrays requires further investigation.
1：Experimental Design and Method Selection:
The study involves the design of a diffusion charge compensation (DCC) strategy for PV strings, utilizing the inherent diffusion capacitance of PV modules for power balancing during partial shading. The methodology includes simulation in MATLAB/Simulink and experimental validation under various partial shading scenarios.
2：Sample Selection and Data Sources:
The study uses commercially available poly-crystalline and back surface reflector (BSR) based PV modules. Data is collected through simulation models and experimental setups under controlled shading conditions.
3：List of Experimental Equipment and Materials:
The experimental setup includes seven 50 W PV modules, IRF540 MOSFET switches, an AT89C52 microcontroller, BC548 transistors, optional 10A10 diodes, a rheostat (220 Ω, 10 A), Solar Power Meter (TES-1333), Infrared Thermometer (STA380A), and multimeters (Fluke 376 True RMS Clamp Meter).
4：Experimental Procedures and Operational Workflow:
The DCC strategy is implemented in PV modules and tested under various partial shading scenarios. The performance is compared with conventional PV arrays with and without bypass diodes.
5：Data Analysis Methods:
The analysis includes power-current characteristics curves analysis, mismatch loss, power loss, and performance ratio during shading. The conduction losses are derived and calculated mathematically.
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