Research And Design Of Catenary XLPE Cable Control System Based On Advanced Control Algorithm

The advancement of urbanization and the transformation of power infrastructure have made the market demand for cross-linked cables more and more.The Cross-linked Polyethylene(XLPE)cable production line with catenary layout is widely used in industrial production with the advantages of small investment,easy maintenance and high efficiency.The tension control system and temperature control system of catenary cross-linked cable are the key systems affecting the quality of cable production.The tension control system has problems such as strong disturbance,nonlinearity,hysteresis,and real-time variation of the winding radius.Temperature is a controlled object with inertia and large hysteresis characteristics.The temperature control system requires fast response,high precision and strong anti-interference ability in the production process.In practical applications,the conventional PID algorithm cannot achieve good control effect on these two complex systems,thus cannot meet the needs of the production process.Therefore,studying the tension and temperature control system of catenary XLPE cables has practical significance for industrial production.Based on the above background,the main research contents of this thesis are as follows:(1)The production process of catenary cross-linked cable is briefly introduced,and the tension generation principle,tension control method and control device are analyzed.Through the analysis of the principle of cable winding process,it is concluded that the main factor affecting the tension stability is the real-time change of the winding radius.Then the control difficulties and problems to be solved of the catenary cross-linked cable tension control system are summarized,and the characteristics and principles of cable temperature control are introduced.(2)According to the routing process of the catenary XLPE cable production,the mathematical model of the whole tension control system is established by using the mechanism method such as the servo motor motion equation and the rotation law.Then,the mathematical model of the temperature control system is analyzed by the heating principle and characteristics of the cable production system.(3)The traditional PID algorithm,Smith algorithm and predictive PI algorithm are introduced,and the three algorithms are applied to the mathematical model of the one-order inertia plant with time delay.Through simulation and comparison analysis,it is proved that the temperature control system based on predictive PI algorithm has better response performance,anti-interference performance and robust performance.(4)In order to solve the control problems of real-time variation of the winding radius of the tension control system,hysteresis and strong interference,the performance of the cascade control system is analyzed.A cascade tension control scheme is proposed,in which the winding line speed is controlled as the secondary loop and the cable suspension position is controlled as the main loop,then a system control block diagram is given.Next,the dual predictive PI algorithm is compared with several advanced foreign algorithms,which verifies that the dual predictive PI is suitable for controlling integrator and time delay process.Finally,the simulation proves that the cascade tension control system based on dual prediction PI algorithm has good control effect on the real-time variation of the winding radius,the variability of the model parameters.Also,the system has fast response,strong anti-interference ability and good robustness.(5)In order to combine the research content with actual industrial application,a real-time monitoring software based on the OPTO22 PAC Project platform is designed in this thesis.The MATLAB Simulink module is built to simulate the actual tension and temperature system objects in this thesis.Then,the control strategy is designed in PAC Control with the control algorithm discretized and written.Next,the communication and data interaction between PAC Control and MATLAB Simulink is realized by OPC technology.Finally,the human-computer interaction interface is designed in PAC Display.The user can easily modify the parameters of the controller and monitor the operating state of the system on the interactive interface.