研究目的
To propose and evaluate a new monitoring methodology for photovoltaic (PV) systems that can individually characterize modules within a string without disrupting normal operation or modifying the electrical interconnection circuit.
研究成果
The proposed monitoring methodology effectively evaluates individual PV modules within a string using small capacitors and low-power components, achieving accuracies between 1 and 3% near the maximum power point. It offers a low-cost, reliable solution for PV system monitoring without disrupting normal operation.
研究不足
The methodology's accuracy decreases for measurements closer to open-circuit or short-circuit conditions. The use of higher value capacitors could reduce error but increases cost and reduces reliability.
1：Experimental Design and Method Selection:
The methodology involves a monitoring circuit (MC) for each PV module and a control unit (CU) for the entire system. The MC uses small capacitors and low-power components to measure partial I-V characteristics of individual modules.
2：Sample Selection and Data Sources:
A 25 W Isofotón bifacial PV module was used for testing under varying illumination conditions.
3：List of Experimental Equipment and Materials:
The test system included a power supply, electronic load, and an illumination system with 18 lamps. The MC was connected in parallel to the PV module.
4：Experimental Procedures and Operational Workflow:
The MC operates in four modes: standby and three monitoring steps (T1, T2, T3) to measure the module's I-V characteristics by displacing the operating point towards short-circuit and open-circuit.
5：Data Analysis Methods:
The CU processes the measurement data to estimate the I-V curve and maximum power of the PV module, with error rates calculated between static and dynamic I-V characteristics.
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