Analysis And Synthesis On The Main Steam Temperature Control System Based On H_∞ Theory

In this paper,the dynamic characteristics of steam temperature controlled object inthermal power plant is discussed,the controlled object with large inertia,long timedelay and various of disturbance behaviors,and the mathematical model with uncertaincharacteristics;Put forward H_∞ mixed sensitivity design method for main steamtemperature control system,select suitable weighting function,solve H_∞ optimumcontroller, and run system simulation experiment, the results show the control systemwith better robustness stability and dynamic quality;In order to overcome defect with thedifficult of choosing weighting function in H_∞ mixed sensitivity design method,bythinking of H_∞ loop shaping,no choose any weighting function and design betterrobustness controller directly.