Possibility of robust temperature control of superheated steam of the through-flow boiler

This paper presents the simulation and method of using the robust control theory (decentralized and centralized control systems) for temperature control of superheated steam in the once-through boiler. As the theoretical base, we used synthesis of robust H_∞ controllers that minimize the standard mixed sensitivity function. For the decentralized temperature control, we applied the classical cascade structure where we used the P controller in the secondary loop and the robust controller in the primary loop. Besides this arrangement, we used a single robust controller in the feedback loop. The centralized robust control structure was chosen as the third option. Results of the simulation and the good robust qualities of the robust controller presented in this paper confirm that the controller can provide a basis for industrial implementation of sophisticated algorithms which are prepared.