Mesoscale photovoltaic power generation solar resource estimation method in complex terrain

The invention discloses a method for estimating small-scale photovoltaic power generation solar resources in complex terrains. The method comprises the steps of evaluation area selection, basic data acquisition, spatial data set calculation, time data set calculation, total radiation calculation, optimal inclination angle calculation and determination of an optimal construction site of a photovoltaic power station. According to a mountain climate principle, a terrain shielding model is established, solar radiation distributed simulation under a complex terrain is established in combination with MODIS satellite surface reflectance products and astronomical factors in recent 10 years, and the influence of topographic relief on solar radiation is objectively reflected. The radiation difference between the sunny slope and the shady slope and the shielding effect of the mountain and the surrounding terrain are intuitively reflected. And further calculating the optimal slope annual total radiation of the complex te