根据几何光学原理,通过联合求解高次曲面方程,采用射线踪迹蒙特卡洛法(Monte-Carlo ray-tracing Method,MCRT)模拟了直射太阳光束在三维CPC内的传播过程。通过数值模拟,分析了三维CPC的太阳能聚集能流密度分布、方向分布和透过特性以及这些聚集特性参量随CPC高度截取比例、CPC最大接收角、跟踪误差等因素的变化。结果表明,三维CPC的出射面太阳能热流分布出现峰值;截顶后三维CPC的最大接收角不变,透过率性能有所改善。 According to the principle of geometrical optics, the propagation of the direct sunlight beam in the three-dimensional CPC was simulated by jointly solving the equation of higher order surface with Monte-Carlo ray-tracing method (MCRT). Through numerical simulation, the energy density distribution, directional distribution and transmission characteristics of solar energy of three-dimensional CPC were analyzed. The variation of these parameters with the CPC height intercept ratio, CPC maximum acceptance angle, tracking error and other factors were analyzed. The results show that the distribution of solar heat flux on the exit surface of three-dimensional CPC shows the peak value. The maximum acceptance angle of the three-dimensional CPC does not change and the transmission performance is improved.