Study of Solar Radiation in View of Photovoltaic Systems Optimization

The meteorological data concerning solar radiation are generally not sufficient to allow quantifying all the phenomena which occur when a photovoltaic panel receives solar light. It is therefore, necessary to supplement these data by using astronomical calculation for the sun position and modelling the atmosphere. A simple method to calculate global, diffuse and direct irradiance on vertical and tilted surfaces for all uniform sky conditions (clear sky and overcast sky), developed in Constantine (Algeria) and Louvain-la-neuve (Belgium), has been compared with experimental data obtained at Ghardaia (Algeria). In spite of its simplicity, the method furnishes reasonably good predictions, in comparison with experimental data, and can be proposed as a simpli?ed tool for design purposes. This method relies on the fact that we can calculate the irradiance on a plane with arbitrary orientation and inclination, based on the measurement of a single irradiance value on a reference plane.

中国西北地区环日辐射及其对太阳能热发电影响的数值模拟研究

基于中国西北地区地面能见度观测数据及ERA5再分析数据,利用SMARTS模式模拟西北地区法向直接辐射(DNI),经过计算得到西北地区环日辐射(CSNI)和环日辐射比(CSR),并分析影响CSR的气象要素,结果发现:1)在2.5°半开敞角下,中国西北地区多年平均CSNI曝辐量处在21~33 kWh/m^(2)之间,最大值位于昆仑山及其以北地区,新疆北部、甘肃北部以及内蒙古西北部地区为全区域CSNI的低值区。春季和夏季CSNI曝辐量相对较高,秋季和冬季相对较低;2)中国西北地区多年平均CSR处于0.8%~1.8%之间,存在2个大值中心,一个位于昆仑山及以北的塔里木盆地,另一个位于西北地区东南部,CSR的低值区域主要位于高原地区,普遍处在1%以下。春季、夏季和秋季与年平均CSR空间分布相近,冬季的CSR则存在明显不同,能见度是影响其空间分布的重要因素。3)CSR的量值大小和空间分布反映了环日辐射对太阳能热发电的影响程度,在电站的资源评价、工程设计和发电量测算中,应充分考虑环日辐射的影响。