Research On Modeling And Control Method Of Parallel Driven Umbrella Heliostat

With the deepening of environmental pollution and energy crisis all over the world,countries are paying more and more attention to solar power generation,a green and pollution-free power generation method.The tower type solar thermal power generation in solar power generation has the advantages of stable and adjustable power generation,good power quality,small heat loss,large concentrating ratio,high efficiency,and can complement other power generation forms such as thermal power generation.In the tower photothermal power generation,the heliostat,as an energy gathering device,can concentrate the solar radiation to the collector and is one of the core components of the system.Its cost accounts for more than 60%of the cost of the tower photothermal power station.Therefore,it is of great significance to explore the driving mode of heliostat with low cost,high accuracy and high wind resistance for the large-scale application of tower photothermal power generation technology.The main research contents of this paper are as follows:(1)The mechanical structure of the parallel driving umbrella heliostat control system is designed.The heliostat is driven by three ropes,which greatly reduces the mechanical cost of the heliostat.(2)The rope length attitude model of the parallel driving umbrella heliostat control system is established.In order to verify the correctness of the model,the simulation experiment is carried out on MATLAB,and the results show that the model is correct.The control method of heliostat is studied,the feedforward feedback control method is designed for the system,and the specific heliostat contr ol strategy is designed in detail to solve the complex control problem caused by the parallel characteristics of heliostat.(3)The overall hardware scheme of the parallel drive umbrella heliostat control system is designed,the hardware composition block diagram of the control system is drawn,and the functional requirements of each module are analyzed.The hardware design of the detection module and the main controller module is carried out in detail,including chip selection,hardware circuit design,etc.(4)The overall software scheme of the parallel drive umbrella heliostat control system is designed,and the functions of each module are described.The software design of the detection module and the main controller module is carried out in detail,including the program flow chart,the program design idea and so on.(5)The experimental platform of the parallel driving umbrella heliostat control system is built,the experiments are designed,and the experimental results are analyzed to verify the feasibility and rationality of the mechanical design,modeling and control methods,hardware design,software design and so on.The results show that the parallel driving umbrella heliostat designed in this paper can meet the tracking accuracy requirements of heliostat.The results show that the parallel driven umbrella heliostat designed in this paper achieves 0.1 degree accuracy,meets the tracking accuracy requirements of the heliostat,and can track the sun stably and reliably.