Application And Research Of Internal Model Control Technology For Reheated Steam Temperature Control System

In this paper, on the basis of the traditional internal model control structure, we summarize the basic principles and design approach of the internal model control. For the stable controlled process with time-delay, the internal model controller will be transformed into a PID controller, while a first order Pade approximation is used for time delay. For unstable object with time-delay, an improved internal model control structure is given. For a process with time-varying parameters, based on analysis of multi-model control algorithm, weighted multi-internal model control algorithm and the principles of multi-switch internal model control algorithm are presented. Then the algorithm is used in a reheated steam temperature control system of a power plant. Load feed-forward, as well as wind-forward are designed based on the characteristics of the reheated steam temperature control system. Simulation results show that the control system designed has an excellent performance.