研究目的
To efficiently evaluate the operating status of photovoltaic (PV) arrays and detect abnormalities and/or faults through a fast current-voltage (I-V) characteristic tester.
研究成果
The proposed I-V tester can quickly and accurately measure I-V curves of PV arrays and extract model parameters. The RMSE of parameters extraction serves as an effective indicator of partial shading condition.
研究不足
The maximum PV array voltage and current the tester can handle is 500V and 20A respectively. The time spent on parameter extraction is around 10 seconds, which may not be suitable for real-time applications.
1：Experimental Design and Method Selection:
The design uses the dynamic capacitor charging method for fast I-V curve sweeping and the ABC-NMS hybrid algorithm for parameter extraction.
2：Sample Selection and Data Sources:
A laboratory PV array consisting of twelve monocrystalline silicon PV modules was used for testing.
3：List of Experimental Equipment and Materials:
The tester includes hall current and voltage sensors, capacitors, IGBT power switch, insulated solid-state relay, DSP processor, and LCD interface.
4：Experimental Procedures and Operational Workflow:
The I-V characteristics curve is swept by charging capacitors connected in a series-parallel way. The process involves controlling the charging circuit, data acquisition, and parameter extraction.
5：Data Analysis Methods:
The ABC-NMS hybrid algorithm is used to minimize the error between simulated and measured I-V curves, with RMSE as the objective function.
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