研究目的
Detecting the faults and their locations in photovoltaic arrays based on time series of PV string current.
研究成果
The proposed method based on LOF can effectively detect and locate faults in PV arrays, including short circuit, open circuit, and shadow faults, under varying irradiance conditions.
研究不足
The method's effectiveness is demonstrated under specific conditions (high and low irradiance) and may require parameter adjustments for different scenarios.
1:Experimental Design and Method Selection
A time series sliding window (TSSW) is adopted to calculate the local outlier factor (LOF) of each current point in the TSSW for fault detection.
2:Sample Selection and Data Sources
A 1.8KW grid-connected photovoltaic system is used, consisting of PV array, weather station, data acquisition circuit, combiner box, grid-connect inverter, and a PC to process the data.
3:List of Experimental Equipment and Materials
PV array (monocrystalline, 6×3 modules), grid-connected inverter (Goodwe GW2500-NS), weather station, data acquisition circuit, combiner box, PC.
4:Experimental Procedures and Operational Workflow
The experiment is conducted at high irradiance (800W/m2) and low irradiance (280W/m2) with a sampling frequency of the current data at 10Hz. The TSSW size N is set to 20, M to 5, θ to 1.3, and the number of nearest neighbors k to 10.
5:Data Analysis Methods
The LOF algorithm is applied to detect outliers in the current time series for fault detection.
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