Three-tank Control Algorithm Research And Remote Monitoring System

As a typical model of many objects in industrial process control,the three-tank system can simulate the control process of liquid level,temperature,flow and other parameters in industrial process,the system is widely used in the research of control algorithms.Three-tank system is open,and further control algorithm research on it has an important application value in the field of engineering control.Domestic and foreign experts and scholars have done many research on modeling methods,control algorithms,fault diagnosis and other aspects of the three-tank system,and achieved a great deal of results.In this thesis,the research work on the modeling methods,control algorithms and remote control systems of the three-tank system is described.The main contents and achievements are as follows:(1)Model the three-tank,choose and do research on the internal model control algorithm according to the characteristics of the model.The principle and structure of the internal model control algorithm are described,then design internal model PID controller.Parameter tuning of the internal model PID controller.According to the influence of the internal model control algorithm on the closed-loop stability of the system,the least square error is used as the performance index to analyze,the time constant of the filter should be chosen to be greater than the lag time ?.The internal model control algorithm is applied to the three-tank,the experimental results show that the internal model control algorithm has a certain tracking ability and anti-interference ability,which can effectively reduce the adverse effects caused by the lag problem.(2)In order to improve the control performance of the internal model control algorithm and reduce difficulty of designing internal model controller,a variable universe fuzzy control algorithm is used to adjust the filter time constant ?.The relative degree function is used to analyze two forms of scaling factor in the variable universe fuzzy control algorithm.The index-type scaling factors with good system stability are selected and the parameters are analyzed.Designing the internal model controller with variable universe fuzzy algorithm.The two major problems,which are the computational difficulties in practical application and the high resource waste caused by the real-time transformation,are improved.One is to use the Taylor formula to improve the exponential scaling factor that is difficult to calculate to an easy-to-implement constant function.Second,Fractal thinking,the transformation of discourse strategies to improve.The second is to make use of the fractal theory to improve the strategy of discourse transformation.The simulation and experimental results show that the internal model control with variable universe fuzzy control algorithm has better control effects than the ordinary internal model control: faster response,less settling time and stronger anti-interference ability,and the algorithm is versatile and practical.(3)A three-tank remote monitoring system is designed to monitor and control the state of the remote experiment process and the experimental platform.The data repeater is designed to realize the network of three tank.The function of data monitoring software and communication modules designed in detail to ensure real-time data,security and reliability,to some extent the intelligent three-tank centralized management is achieved.Research on internal model control algorithm in three-tank,and improve it,which can improve system's response speed and anti-interference.It is convenient to use this algorithm,that can be applied in the field of industrial control process.