Study on Dynamic Model and Dynamic Characteristics of Solar Field of 50 MW Trough Solar Thermal Power Generation Plant

Operation control of parabolic trough solar thermal power generation system is a difficult issue in the operation of the system. The solar field of the first 50 MW trough solar thermal demonstration power plant in China is taken as the research object. Based on the topological structure and working principle of the solar field and the basic laws of optics and thermodynamics, the hydrodynamic calculation model and the heat transfer dynamic model of the multiple parallel heat collecting loops are developed on the real-time dynamic simulation platform iSimu. Using the parallel computing capabilities of the platform iSimu, the full working condition simulation of the solar field is realized. On this basis, the step disturbance experiments of direct normal irradiance (DNI), heat transfer oil’s flow and heat transfer oil’s temperature at the inlet of the solar field are carried out. In addition, the dynamic response curves of step disturbance and the inertia time constant of the heat collecting loops are obtained. The conclusions of this paper have important guiding significance for the operation control strategy formulation and system optimization design of trough solar thermal power generation system.