中文摘要：

槽式太阳能-燃气联合循环将槽式太阳能发电与联合循环进行系统集成，是降低聚光型太阳能发电成本，减少联合循环电站CO2排放的有效途径。本文针对太阳能直接蒸汽发生系统（DSG）与联合循环（CC）构成的系统，研究了不同集热温度下槽式太阳能燃气联合循环热力性能的变化，并探讨了系统热力性能变化的原因。研究表明，在集热器与环境温差变化范围136~271℃内，槽式太阳能-燃气联合循环系统太阳能发电效率，系统发电燃料比值，太阳能发电比例的最佳集成温度并不一致，槽式太阳能-燃气联合循环系统能源利用效率是集成温度的单调增函数。

英文摘要：

The integrated solar combined cycle system （ISCC） offers a high potential for cost reduction of solar power and reduction in carbon dioxide emission of combined cycle power plant. In this paper, the design optimization was carried out for an ISCC system consisting of a direct steam generation （DSG） parabolic trough field coupled to the bottoming steam cycle of a combined cycle power plant. The system thermodynamic performance was calculated and analyzed with the receiver working temperature of the DSG parabolic trough field ranging from 136 to 271℃. The principal result demonstrates that the receiver working temperature has an optimal value for the solar conversion efficiency, and the total thermal conversion efficiency, respectively. In addition, the further increase of the receiver working temperature enhanced the overall efficiency of the system.