Gain-scheduled H∞ control for networked superheated steam temperature

This paper investigates the gain-scheduled problem of the networked control for a superheated steam temperature system with consideration of the network QoS. The designed gain-scheduled controller is based on the network QoS, and thus is less conservative than the conventional controller with constant gains. A network data-transmitting mechanism is constructed, in which the variation of the sampling data and the network QoS are comprehensively considered. Based on the proposed comprehensive model for network-based superheated steam temperature control systems, the H_∞ controllers within the framework of cascade control strategy are designed in terms of linear matrix inequities, which guarantee the requirement of H_∞ performance criterion. Finally, a superheated steam system model is used to demonstrate the effectiveness of the proposed design procedures.