Abstract:

In order to evaluate grid PV power station solar energy resources in Xianning which without solar radiation observation data,by plane solar radiation climatology computative method and slope surface radiation conversion method,that is,based on historical data of Wuhan station on establishing total amount and direct radiation quantity and the sunshine percentage calculation equation Xianning monthly solar radiation components was calculated,and their time change,resource abundance and stability were analyzed.Based on  the scattering radiation isotropic hypothesis,the amount of radiation on tilted surface and the best angle were calculated.Results show that:In recent 50 years(1961~2009) total solar radiation amount in Xiannin region was 4 0914 MJ/m2.This area is a rich region of solar energy resources.The radiation level is C level which is more scattering radiation,and stable degree is higher.Optimum tilt angle in the conditions of the biggest total solar radiation amount of a year is 18°,in this angle the total amount of radiation is 4 2246 MJ/m2,33% higher than the horizontal plane.If it is installed by the best dip and azimuth,the designed capacity of the photovoltaic array 1 500 kWp annual power will generate 132×106 kW·h.The reasonable calculation and application of evaluation index of various components of solar radiation will provide a scientific basis for planning and design of photovoltaic power plants,and provided a sample of similar work in future