This study evaluates the performance of 3 numerical prediction models: CMA-WSP
CMA-MESO and NCEP-GFS
of the global horizontal irradiance (GHI) at 30 PV stations in Hebei Province in 2022. The results show that the CMA-WSP has the lowest forecasting error and the highest correlation coefficient
followed by CMA-MESO. The CMA-WSP exhibits a systematic overestimation
while both CMA-MESO and NCEP-GFS show a systematic underestimation. The CMA-MESO has the lowest large error ratio (with a deviation of over 200 W/m)
while the CMA-WSP coming second. All models show samples with deviation of more than 700 W/m. During fog
haze
and sandstorm weather processes
the CMA-WSP performs the best
while the CMA-MESO performs the best during rainfall
snowfall
continuous rainy periods
and severe convective weather processes. For PV stations at different locations
the forecasting performance of the three models varies significantly across different weather processes. For some stations
the overall forecasting errors of all numerical models are relatively small across different weather processes
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