Development of a Regional Photovoltaic Baseline Dataset for Qinghai Province
To support the operational needs for detailed assessment of solar resources and PV power forecasting in high-altitude regions of Qinghai Province, this study conducted the standardization and development of a PV dataset, along with end-to-end quality control, based on 15-minute interval measured data from June 2021 to June 2022 at four typical PV power plants in Qinghai Province. Missing values were imputed using physical threshold constraints and linear/co-periodic mean interpolation. A combined outlier detection model utilizing DBSCAN density clustering and random forest regression was constructed to automatically identify and remove invalid values, abnormal spikes, and physically implausible data. The results show that after quality control, the valid data rate for total radiation increased from less than 30% to 87.5%, with a correlation coefficient of 0.92 relative to meteorological parameters and a root mean square error of 48.7 W·m⁻². The data quality meets the requirements for solar resource assessment and power forecasting.
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