智能預(yù)測控制在磨機(jī)自動控制系統(tǒng)中的應(yīng)用
[Abstract]:Grinding machine is one of the important equipment in cement grinding system. The stability of mill load directly affects the grinding efficiency of grinding machine and the quality of cement finished product. Therefore, it is of great significance to study the mill load. With the improvement of automation level, the requirements of model research and optimization control of mill automatic control system will be higher and higher. Because the mill is a complex industrial controlled object with nonlinear, pure lag and strong coupling, it is difficult to obtain good control effect by using conventional control algorithm. In this paper, the automatic control system of a cement mill is taken as the research object. On the basis of understanding the present research situation of cement grinding system at home and abroad, the intelligent predictive control is proposed to optimize the mill load control. According to the combined grinding process, the speed of the separator is selected as the input of the system, the current of the output hoist is taken as the output of the system, and the predictive control strategy based on neural network is adopted to optimize the load of the mill. On this basis, the upper computer software of the mill automatic control system is developed. The main work of this paper is as follows: (1) Identification of mill load model and design of predictive controller using three-layer forward BP neural network. First, the input and output data are collected to identify the order of the input and output delay of the system model, and then the neural network model is used as the prediction model, and the N-R rolling optimization method is used to calculate the future control sequence of the system. Feedback correction is used to overcome the model prediction error caused by disturbance. Finally, the effectiveness of the algorithm in the cement mill automatic control system is verified by Matlab simulation. (2) the predictive control software is developed by using the mixed programming of MFC and Matlab in VC. The algorithm program written in m file is compiled into VC's DLL dynamic link library file by Matlab Compiler method, and the function of algorithm module is realized by calling DLL file in VC, and the function of data reading and writing is realized by OPC technology. In order to display the dynamic effect, the TeeChart5 control is imported into the MFC program to display the changing trend of the grinding hoist current in real time in order to realize the design of the user interface. (3) for the practical application of the project, the effectiveness of the optimized control software is verified. The optimal control effect of the software is verified by observing the real-time curve. The results show that the optimal control software developed in this paper can adjust the current of the mill hoist to the set value and make the mill load stable.
【學(xué)位授予單位】:濟(jì)南大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TQ172.632;TP273
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