Refined Assessment of County Solar Energy Resources Based on Downscaling CLDAS Radiation Products
He Fei
Chen Zhenghong
Sun Pengjie
Meng Dan
Zhu Chuandong
Abstract：To carry out the refined assessment of solar energy resources in a county scope,this pa-per takes the Danjiangkou City as an example.First,the radiation observation data of surrounding nation-al meteorological stations are used to verify and linearly regress the high spatial-temporal resolution CL-DAS(Land Surface Data Assimilation System of China Meteorological Administration)radiation prod-ucts.Then,a multivariate linear regression model of global radiation and major geographical factors are established by using GIS technology,reducing the spatial resolution to 25 m,and the effectiveness of the correction method and regression model are tested.Finally,the refined assessment of solar energy re-sources in the region is performed according to the relevant national standards.The results show that:(1)The correlation coefficient between the observed global radiation value at national meteorological sta-tion and the corresponding CLDAS global radiation is 0.912,which can be increased to 0.960 after the regression equation is established and revised monthly.The global radiation of CLDAS is significantly higher than the observed value,with the annual average absolute error and the annual average absolute percentage error being 116.7 MJ/m2 and 37.2％,respectively.The two values are reduced to 27.3 MJ/m2 and 8.1％ after correction.(2)The annual average absolute error and annual average absolute percentage error between the model calculation results and the measured radiation values of photovoltaic power station in Danjiangkou City are 144.6 MJ/m2 and 3.2％respectively,which can better reflect the actual condi-tion of global radiation.(3)The assessment results show that Danjiangkou City is rich in solar energy re-sources with the annual global radiation of 4406.1-4676.7 MJ/m2.The solar energy resources are dis-tributed more in the central plain valley area and less in the southern and northern high-altitude mountain areas.The solar energy resources are stable in the whole city,and the stability is in an increasing trend from west to east.The radiation type throughout the year is mainly the diffuse radiation,and the direct ra-diation is more in May,June and July.(4)With the constraints of photovoltaic development and the a-vailability of different land types,the available utilization area of Danjiangkou City is 80.0 km2,and the technological development volume is 6,416,000 kW.The towns in the east and west border areas of the central region can be given priority to develop solar energy resources.After being revised and downscal-ing,CLDAS radiation products can be used for the refined assessment of solar energy resources in county areas,helping rural development under the action of promoting rural revitalization and the promotion of solar power generation under the"dual carbon"goal.
Keywords：CLDASradiationgeographic informationrefined assessmenttechnological develop-ment volume
Publication Date：2023-12-28
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：10( 49-58 )