Study On Control Strategy Of Light Concentration System In Heliostat Field Of Solar Tower Power Plant

As the front-end part of the whole system,concentration system in the solar tower thermoelectric system affects the power generation efficiency of the system.So it is essential to study on accurate control strategy of light concentration system in heliostat field.Firstly,this paper first derives the solar position algorithm according to the visual date trajectory,and carries on the feasibility study to carry on the solar height angle and the azimuth angle simulation to the Delinha heliostate field in Qinghai province for 4particular days.According to the possible situation in the field,the solar position algorithm is improved,and a more accurate model is established by unifying the time scale.The uncertainty and delay are introduced to simulate the actual working conditions,and proves that the model has better jamming property and rapidity.Secondly,the motion trajectory model of the heliostat field is established by using Monte Carlo Ray pursuit method.The motion trend of the azimuth height angle of the sunset in the summer solstice and winter solstice of the city was simulated respectively,and the motion law of the heliostat is analyzed by the relative position between the heat absorber and the heliostat.In order to develop a detailed control strategy,the opening and shutdown of the actual power plant is studied,the annual sunrise and sunset time point is simulated,and the solar height angle and solar radiant energy are too low at sunrise and sunset,so the threshold value of DNI is set from the thermal economic benefit,and the solar radiant energy is greater than 200w/m~2 before it can be opened.Less than this value can be closed,this control strategy greatly reduces the operating costs of the sun-fixing mirror field,avoiding unnecessary waste.Finally,the influential factors of the concentration efficiency in the heliostat field are analyzed concretely,and the concentration efficiency distribution of the wheat field heliostat field in LightTools,Qinghai Province,is simulated in the middle of the summer solstice,and the control strategy of the High efficiency Zone for the maintenance and cleaning of the inefficient area is put forward,which provides theoretical support for the efficient economic operation of the solar tower power plant.