大型光伏电站集电线路电缆经济截面选择

Determination of Cable Economic Section of Collector Line in Large-scale Photovoltaic Power Station

光伏电站集电线路电缆用量大,其损耗是光伏电站电能损耗的重要组成部分,在新能源项目平价上网时代,降低度电成本愈发重要,因此集电线路电缆经济截面的选择值得关注。根据光伏电站的运行特点,提出采用与光伏出力特性相近的斜线和半正弦模型计算最大负荷损耗时间的方法,并结合目前光伏广泛采用的铝合金电缆、平价上网以及最佳容配比设计等因素,对影响电缆经济截面的主要参数进行探讨。在此基础上,选择包头、银川、常州和衡阳4个地区,对光伏电站集电线路的经济截面进行计算和分析。

Collector line of photovoltaic power stations needs a large quantity of electric cables,and its loss composes a large segment of whole power loss in photovoltaic power stations.In the era of grid affordable access of new energy power,it is more and more important to reduce LCOE,and the appropriate determination of cable economic section of collector lines deserves attention.According to the operation characteristics of photovoltaic power station,this work proposes a calculation method for the annual maximum load loss hours of the collector line based on approximate output oblique line and semi-sine model.By combining the factors including the use of aluminum alloy cable,the affordable grid access and the optimization of capacity ratio design,main parameters influencing the economic section of cable are discussed.Furthermore,the economic sections of some exemplary photovoltaic power stations in Baotou,Yinchuan,Changzhou and Hengyang are calculated and analyzed.