研究目的
To present an extraction method for the parasitic capacitance between the PV module and the ground, addressing the issue of leakage current in non-isolated PV systems, especially in rain environments.
研究成果
The proposed method for extracting the parasitic capacitance of PV modules based on the leakage current oscillation period is convenient, easy, and accurate. It has been validated through comparison with 3D finite element simulation and impedance analyzer test methods.
研究不足
1. The actual capacitance used may not be standard.
2. Errors can be caused by the experimental process.
3. There are simplifications in the theoretical analysis.
1：Experimental Design and Method Selection:
The method involves measuring the leakage current oscillation period to extract the parasitic capacitance of the PV module. A full-bridge inverter is used for both explaining the principle and for measurement.
2：Sample Selection and Data Sources:
The experiment uses a DC source to simulate the PV module and then experiments with an actual PV module in a rainy environment.
3：List of Experimental Equipment and Materials:
Key experimental parameters include input DC voltage, filter inductances, filter capacitance, load resistance, and the photovoltaic module parasitic capacitance.
4：Experimental Procedures and Operational Workflow:
The experiment involves building a circuit according to the proposed method, measuring the leakage current oscillation period, and calculating the parasitic capacitance.
5：Data Analysis Methods:
The parasitic capacitance value is derived from the measured oscillation period using a derived relationship between the oscillation period and the parasitic capacitance.
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