槽型抛物面太阳能电站的前景和不同冷却系统的比较分析

Simulation of parabolic trough solar power generating system for typical Chinese sites

土地现状等要素使槽型抛物面太阳能电站在我国具有发展前景,西北地区为最具潜力的地区;水资源的缺乏使得该类电站的选址受到局限,有必要通过系统仿真的方法对采用直接冷却系统的电站的运行性能进行比较分析,以便为该项技术在中国的可行性研究提供参照。运用了STEC模块在TRNSYS环境下,建立了35 MW槽式电站(直接冷却)的仿真模型,对位于拉萨的电站运行进行了模拟,并与采用水冷系统的电站进行了对比。模拟结果表明,在6月份两种冷却方式的净功率相差最大,为2.23 MW;而在1月份仅相差0.25 MW,这对于夏季供电需求较大的电站来说尤为不利。

With the large area of waste land in the northwest, parabolic trough concentrating solar power （PTCSP） has great potential in China. However, due to water shortage, it is necessary to study the operation performance of the PTCSP plant with dry cooling, for reference of the feasibility study of this technology in China. In this paper, a model of dry cooler is established, and a dry cooling- PTCSP plant of 35 MW is simulated with Solar Thermal Electric Components （STEC） model in the environment of TRNSYS （version 16） for the city of Lhasa. The system model is established according to Rankine principle. The simulation results are compared with those for the water cooling plant. It is concluded that the performance difference is large in summer, which is 2.23 MW in June, while just 0.25 in January. This is especially positive for the plant with summer- dominated grid requirement.