Modeling And Simulation Of Dynamic Processes In Heated System Of A Tower Solar Power Station

In response to the energy shortage,climate change and pollution of the environment,many countries in the world have been actively doing research on the solar thermal power generation system.The solar tower power generation is one of the most economical ways to produce electricity in large scale.Because the solar energy is intermittent and the power system is nonlinear,multivariable and strong coupling,it is necessary to conduct research on the modeling and simulation of the power plant.Thus,reasonable control and heliostat field focus strategy can be designed to ensure the steady,safe and efficient operation of the plant.The receiver of the plant is an important part for photothermal conversion in the solar thermal power system.In this thesis,the models of water/steam receiver and molten salt receiver are developed and simulations are performed.The main contributions are as follows.(1)Based on the conservation of mass,momentum conservation,energy conservation and the state equations of water and water vapor,with the help of the working mechanism of the heat sink system,the heated system simulation model has been established on the Simulink simulation platform.System model to debug,and finally meet the simulation accuracy requirements.(2)Under the condition of 1000 W/m~2 solar intensity,the perturbation test of radiation intensity and feedwater flow rate were carried out respectively.The thermal parameters of the heated system were obtained,The results were analyzed theoretically.In order to study the effect of the magnitude of the step disturbance in the same time on the heatsink system,a series of irradiation intensity and feed flow rate step disturbance test were conducted and compared.(3)A continuous disturbance simulation algorithm is proposed to explain the division of continuous disturbances.It is pointed out that the continuous disturbance can be considered as infinitely many infinitesimal step disturbances.Taking the superheater as an example,the dynamic characteristics of the system is simulated is simulated as the disturbance intensity of the cloud cover,and the results are compared with those of the solar radiation intensity step disturbance.According to the sun radiation intensity continuously change,research continuous cloud cover and the sun through the clouds,the sun radiation intensity complex disturbance when the system dynamic characteristic research is simulated,and compared with the solar radiation intensity step disturbance.