Study on real-time dynamic simulation model for DSG parabolic trough solar power station thermodynamic system

With an modular modeling method, a real-time dynamic simulation model for the thermodynamics system of a solar thermal power plant using direct steam generation in parabolic trough collectors filed (DSG-PTCs-STTP) without heat storage was developed. With certain simplification and assumption, the mathematics model about the solar collector fields, pre-heat, evaporator, super-heat system and buffer steam accumulator in a DSG solar collection and heating system were studied on the basis of the conservation principle and the basic equations of engineering thermodynamics, heat transfer theory and hydrodynamics. The complete real-time dynamic simulation model for the thermodynamic system of DSG-PTCs-STTP was built on the basis of above mathematics models and combined other relevant model (such as fluid network, turbine, condenser, deaerator, pump, alternator and excitation system). The simulation tests show that the developed simulation model can correctly simulate the dynamic characteristic and overall operating process of the DSG-PTCs-STTP, the iterative method applied in the models is stable. The dynamic simulation model can be used to develop the DSG-PTCs-STTP simulator, and is a good nonlinear object model for testing and validating the control system, and studying the operating performance of the DSG-PTCs-STTP.