固定式光伏方阵最佳倾角的计算与分析

CALCULATION AND ANALYSIS OF OPTIMUM TILTED ANGLE FOR FIXED PHOTOVOLTAIC ARRAY

利用太阳辐射量和天空散射各向异性的模型,分析固定式光伏方阵最佳倾角,计算出7种不同倾角下的各月日总辐射量和平均日辐射量。在确定最佳倾角时,以夏半年和冬半年方阵面上接收到的平均日辐射量H1和H2为依据,呈现出H1和H2随倾角变化的曲线。结果表明,夏半年平均日辐射量H1随倾角的增大逐渐减小,冬半年的平均日辐射量H2随着倾角的增大呈现出先增后减的趋势,并在某个倾角处出现最大值。分别以张掖、拉萨、广州为例,计算上述地区不同倾斜面上的平均日辐射量,经过分析比较最终确定张掖、拉萨、广州地区的最佳倾角。

The optimum tilted angle of fixed photovoltaic array is analyzed based on the model of solar radiation and the anisotropy of the sky scattering. The total daily radiation and average daily radiation amount of each month under seven different inclinations are also calculated. The average daily radiations H1 and H2 which are received on the square surface of summer half year and winter half year are taken as a basis to determine the optimum tilted angle.Subsequently,the corresponding curves of H1 and H2 that varying with the tilted angle are presented. It can be seen from the results that the average daily radiation H1 in summer half year decreases with the increase of tilted angle. The average daily radiation H2 in the winter half year increases with the increase of tilted angle and then decreases,and the maximum value appears at a certain tilted angle. Afterwards,especially take Zhangye,Lhasa and Guangzhou as an example,the average daily radiations on different slopes in these regions are calculated respectively,The optimum tilted angles in Zhangye,Lhasa and Guangzhou are determined by analysis and comparison.