Utilizing solar irradiation and irradiance, total cloud forecast data, hourly total cloud comprehensive data, and environmental monitoring station PM10 hourly average concentration measured data from four photovoltaic power stations in Laiyuan, Quyang, Pingshan and Shexian at the eastern foothill of Taihang Mountains from January 2021 to December 2023,this paper analyzed the time and frequency characteristics of solar radiation intensity, studied the clear sky correction model based on radiation ratio and hourly average concentration of PM10, and tested its correction effect. The results indicate that: (1) There were numerous sand-dust weather processes from 2021 to 2022 with a maximum impact time exceeding 63 hours. When PM10 hour concentrations exceeded 1 588 μg/m3, solar irradiance decreased to 26.3% of sunny days. (2) Daily and monthly variations of total solar radiation were evident with a normal distribution centered around 12-13 o'clock BT and a single peak distribution centered around June. In March, July, and November, the solar radiation intensity was lower than the overall trends due to sand-dust, precipitation, and heavy fog. (3) The sand-dust weather irradiance model positively impacted the overall revision of solar irradiance forecast with MAE decreasing by 34.3 W/m2 and RMSE decreasing by 31.0 W/m2. The correction effect is closely related to the forecast quality of PM10 hour average concentration. When the PM10 forecast effect is good, the correction effect is obvious; otherwise it is poor.
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