基于年总太阳辐照量的宁夏某平单轴光伏电站最佳安装倾角优化研究OA

According to the solar motion characteristics,the solar elevation angle exhibits periodic variations with time and seasons,thereby affecting the power generation capacity of PV power stations equipped with flat single-axis tracking PV bracket.Taking a PV power station with flat single-axis tracking PV bracket in Ningxia Hui Autonomous Region as an example,this paper systematically analyzes the reasons for the concave shape of the effective irradiation cross-section ratio curve at solar noon during winter from the perspective of solar motion patterns.Based on this,the PVsyst software is used to simulate and analyze the optimal installation inclination angles for the flat single-axis tracking PV bracket throughout the year and the periodic optimal installation inclination angle adjustment strategy.The analysis results show that:1)When using flat single-axis tracking PV bracket,the annual total solar irradiation received by the PV array surface first increases and then decreases with the installation inclination angle of PV bracket,reaching its maximum at an installation inclination angle of PV bracket of 34°.2)Compared to fixed PV bracket at the optimal installation inclination angle and flat single-axis tracking PV bracket at a 15° installation inclination angle,the annual total solar irradiation received by the PV array surface is increased by 14.06%and 3.40%,respectively,when using flat single-axis tracking PV bracket at a 34° installation inclination angle.3)A four-times-per-year on a quarterly basis installation inclination angle adjustment strategy is proposed.Under this strategy,the annual solar irradiation obtained by the flat single-axis tracking PV bracket at their optimal installation inclination angles in each period is increased by 4.4%compared to using a 34° installation inclination angle throughout the year,and by 7.9%compared to using a 15° installation inclination angle throughout the year.