The Application Study Of Variable Control With Sliding Model In A Complex Temperature Object

To the circles of control, it is one of the most challenging subjects for us to try different methods on the object with time-varying, nonlinear, badly time delays, varying parameter, which presented in the industrial process. Variable structure control with sliding mode (VSCSM) has the peculiarity such as reduced order, better robustness and quickly response and it has been broadly used in the field of control with the development of computer technology and the produce of high-speed switch circuit, but it is few applied to complex process systems. In this paper, VSCSM method was used to control the complex process object and the application of VSCSM was especially studied.The description was translated from the transfer function to the phase plane before studying control algorithm of sliding mode on the complex temperature object (CTO) . During this process, disturbance matrix was mainly calculated. The result indicates that the disturbance matrix of the complex temperature object is dissatisfied with the matching condition of variable structure control with sliding mode. It brings difficulty to the directly application of sliding mode control on CTO.Since the presented disturbance was dissatisfied with the matching condition of VSCSM, an amendable method was proposed to resolve it in this dissertation, which provide a new method for the application of sliding control on the object dissatisfied with disturbance matching condition. According to the analysis of simulation curves and thecontrast between PID controller with disturbance feedforward compensation and fuzzy controller, it can be concluded that the new method of control not only has better robustness to the disturbance and varying parameter, but also has quick response and simple realization applying to the system with strict demand on the range of export parameter under variational condition.