研究目的
To propose a sub-module level switched-inductor (SL) based differential power processing (DPP) technique for parallel connections to alleviate the mismatch effect in photovoltaic (PV) systems caused by partial shading.
研究成果
The proposed switched inductor (SL) based concept for parallel-connected PV sub-modules effectively mitigates the mismatch effect by equalizing the sub-module voltages, resulting in significantly higher output power compared to the traditional bypassing technique. This concept can be applied to parallel-connected PV strings to improve the performance of large PV systems.
研究不足
The cost of the proposed technique is a primary concern in comparison to a traditional diode, although they are competitive in the commercial market. The technique is more specific to small power applications.
1：Experimental Design and Method Selection:
The study employs a switched-inductor (SL) based differential power processing (DPP) technique for parallel-connected PV modules to mitigate mismatch effects.
2：Sample Selection and Data Sources:
Simulations are performed in PSIM for different cases involving PV modules with series-connected sub-modules under various irradiance levels.
3：List of Experimental Equipment and Materials:
PV sub-modules, Schottky diodes, inductors (L1, L2, L11, L22), and transistors (Q1, Q2, Q3, Q4, Q11, Q22, Q33, Q44) are used.
4：Experimental Procedures and Operational Workflow:
The proposed technique is compared with the traditional Schottky diode bypassing technique under six partial shading cases.
5：Data Analysis Methods:
The output power and voltage across each PV sub-module are analyzed to evaluate the performance of the proposed technique.
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