Control of superheated steam temperature in large-capacity generation units based on active disturbance rejection method and distributed control system

Active disturbance rejection control (ADRC) is an effective control method to improve dynamic performance of control system based on disturbance estimation and compensation. In this paper, a practically effective method for tuning of ADRC parameters was proposed since tuning of ADRC parameters is one of the most important parts in its application to process control. A set of reusable initial values for ADRC parameters was decided with ESO stability analysis and experimental approaches. Effect of ADRC parameters on control performance was also investigated and detailed description of tuning method for ADRC parameters in closed-loop control was proposed. The parameter tuning procedure for ADRC can be started with these initial values and the tuning is carried out based on the effect of ADRC parameters on control performance. ADRC was applied to the control of superheated steam temperature in large-capacity generation units as ADRC-PID cascade control. Parameter tuning for the ADRC-PID was described. Simulation results of ADRC-PID, traditional PID-PID and DMC-PID cascade control were presented and compared. The detailed implementation of the designed system based on Distributed Control System (DCS) was given as well. The results of real-time simulation based on DCS proved the effectiveness of the proposed strategy.