Nonlinear control of U-tube steam generators via H_∞ control

摘要

The objective of this paper is to design, analyze and evaluate a controller for the water level of U-tube steam generators. The control objective is to closely regulate the water level during extreme load variations and despite drifts in process parameters. The controller design is based on the H. -norm. Gain-scheduling is used to obtain a global water-level controller. The controller performance is satisfactory at all power levels. In view of a comparative analysis of the H, controller with an LQG/LTR controller, implementation and use of the gain-scheduled H. controller over the equivalent LQG/LTR controller is recommended.