Research And Design Of Cloud Platform-Based On Greenhouse Control System

In recent years,with the development of "smart agriculture" and the country’s emphasis on new agricultural planting,a variety of greenhouse environment monitoring system solutions have emerged.However,local control methods are basically adopted for control,and this kind of control method has many problems,such as the algorithm cannot be complicated,the replacement procedure is not flexible,and so on.Therefore,this thesis introduces a new concept"cloud control system" combined with the greenhouse environment to design a new greenhouse control system.At the same time,the greenhouse control object as a typical non-square thin system brings a new challenge to the control algorithm design.Aiming at the above-mentioned problems,this thesis proposes a greenhouse environment control system based on a cloud platform and cloud controller as the core,and conducts a preliminary study on the control method of the non-square thin system.First of all,this thesis analyzes the existing greenhouse environment monitoring system.In view of the problems of the local control system,the functional requirements of this system are carried out,and the system framework of the cloud platform terminal,on-site acquisition control terminal and monitoring terminal based on Zstack is designed.At the same time,the functions and processes that should be completed at each end are established.Then,this thesis carried out a concrete realization of the whole system.The first is the onsite collection and control terminal.In addition to data collection and control execution functions,each device has a data upload function.Through the Wi-Fi wireless network,each device is integrated into the router,and the router interacts with the cloud platform through information;the second is the cloud platform terminal based on Zstack.This terminal includes three parts,namely data nodes,management nodes,and computing nodes.This part is mainly used to calculate and record the environmental parameters returned from the field side,and for the monitoring side to perform data viewing.Thirdly,considering the inconvenience of field testing of the greenhouse control system and the impact of the epidemic,this thesis chooses to use a semi-physical simulation system to test the actual operation of the cloud platform-based greenhouse control system.According to the requirements of system verification,the logic method system of simulation verification is designed,and the simulated greenhouse environment is built based on MATLAB-GUI and Simulink.At the same time,relying on the designed simulated greenhouse environment,the PID algorithm control experiment is carried out in the actual network environment.In the end,this thesis proposes an interval control method based on the RTD-A controller for the non-square thin system based on the characteristics of the greenhouse environment with large lag,high time delay and "thin" system.Taking into account the low degree of freedom of the non-square thin system,combining the idea of interval control,the feasibility problem of setting value control in thin system control is solved;on this basis,the control method is actually applied to the non-square thin system model of the greenhouse environment,and the algorithm is simulated,and the results prove that the algorithm is suitable well performance and excellent control effect.