塔式太阳能热发电站定日镜场容量优化配置

Optimal allocation of heliostat field capacity for solar tower power plant

太阳倍数是反映太阳能热发电站镜场容量的直接参数,同时也是影响储热系统容量的关键参数。文章以我国西部某地区的50 MW塔式太阳能热发电站为例,建立了塔式太阳能热发电站的能量耦合模型和经济性评价模型。以LCOE最低为优化目标,通过模拟得到无储热系统以及当储热时间分别为6,10 h时,有储热系统的太阳能热发电站的最优太阳倍数,并分析了不同储热时间条件下,定日镜场容量对该电站经济效益、定日镜场效率、电站年容量因子等的影响。研究结果表明:太阳倍数和储热容量存在一个最优组合,使得塔式太阳能热发电站的LCOE最低,在此组合下,配置定日镜场容量和储热系统容量,将使得太阳能热发电站能够获得理论上最优的综合经济效益。

Solar multiple is a direct parameter reflecting the heliostat field capacity of CSP. And it is a key parameter affecting the capacity of thermal energy storage system. Taking a 50 MW solar tower power plant in a certain area in western China as an example, the energy coupling model and the economic evaluation model of the solar tower power plant are established. Taking the minimum LCOE as the optimization target, the optimal solar multiple values of the solar tower power plant without thermal storage system and with 6 h and 10 h thermal storage time can be obtained respectively. Under certain thermal storage time, the influence of the heliostat field capacity on the economic benefits of the power plant, the efficiency of the heliostat field and the annual capacity factor of the power plant are analyzed. The research results show that there is an optimal combination of solar multiple and thermal storage capacity to minimize the LCOE of the solar tower power plant. Allocating the heliostat field capacity and thermal storage capacity under this combination, the construction of the power plant will obtain the optimal comprehensive economic benefits.