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该文利用数学模型研究了直接蒸汽发电(direct steam generation，DSG)槽式太阳能集热系统的动态特性。建立了DSG 槽式太阳能集热系统非线性集总参数数学模型。对于DSG集热系统中的蒸发环节，分别建立了其在3种可能运行方式下的移动边界模型，并给出了在蒸发环节运行方式发生变化时，数学模型的切换方法。通过数值仿真实验，研究了DSG槽式太阳能集热系统在太阳辐射强度变化及给水流量变化等主要扰动工况下的响应特性，分析了蒸发环节运行方式发生变化时系统主要参数的动态行为。“,”This paper studied the dynamic characteristics of parabolic trough direct steam generation (DSG) solar collector system by using a mathematical model. Nonlinear lumped parameter mathematical models of DSG parabolic trough solar collector system were developed. For the evaporator loop of DSG solar collector system, moving boundary models under the three possible operating modes were built, and the switching schemes of the mathematical model were put forward when the operator modes of evaporator loop were changed. DSG trough solar collector system response characteristics was studied through numerical simulations in the conditions that the main disturbance operating conditions such as the solar radiation intensity and feedwater flow changed. The dynamic behaviors of the main parameters were also studied when evaporator loop operating modes changed.