Application of H_∞ Mixed Sensitivity Control in Main Steam Pressure System

Main steam pressure is an important parameter in the thermal process control of power plant,which can not be regulated easily.Because boiler burning behaviour varies greatly and the model of main steam pressure is of highly uncertainty,conventional control method can not obtain the expected control effect.In order to improve system control quality,this paper puts forward H∞ mixed sensitivity design method for main steam pressure system.The specific means for choosing mixed sensitivity is given.MATLAB is used to get H∞ optimum controller.Compared with the conventional PID control method,the results show that,when the object model varies strongly,H∞ optimum controller can optimize the main steam pressure control system with better robustness stability and dynamic performance.