Robust Control System Design For Large Unit Main Steam Temperature

Thermal power plant main steam temperature is a very important control parameter for the thermal power plant,which has an effet on operating efficiency and security, but the main steam temperature changes with time-varying load to the main steam temperature control has brought difficulties, the conventional cascade control and guide the former can not satisfy the differential control of thermal power plant main steam temperature control requirements, seriously affecting the thermal power plant operational safety and efficiency. The robust control is proposed for the object variability of advanced control strategies, for an object containing parameter variability has good robustness, in view of the advantages of robust control, this paper designed the main steam temperature - sub-optimal controller through simulation studies have shown that robust control of main steam temperature control has achieved better control than conventional results, and has better robustness.This paper, based on Lyapunov stability theory, linear matrix inequality of the effective tools of linear robust control problem for continuous systems.LMI-based study of uncertain continuous systemsγ- sub-optimal H∞state feedback control problem. Based on stability theory, is presented based onγ- sub-optimal H∞state feedback controller design method. In the study of uncertain continuous systemsγ- suboptimal H∞state feedback control based on the existence of further consideration controller gain perturbations, the guaranteed cost control law is the normal extension to the system parameters and controller perturbations are present the case, in-depth of the non-fragileγ-suboptimal H∞state feedback control problem.The uncertain continuous systems based on LMI'sγ- suboptimal H∞state feedback control law design method is applied to domestic 300MW power unit main steam temperature control system simulation. The main steam temperature control system are designed for state-space model of the corresponding cascade control andγ- sub-optimal H∞state feedback controller. Through the constant disturbance of the simulation results, we can seeγ- suboptimal H∞state feedback control of uncertain than the cascade control system has better control quality, with a relatively fast response time and smaller overshoot. On the uncertain system,γ- suboptimal H∞state feedback control has strong robustness.