Analysis on stability and robustness of MIMO nonlinear synthetic control system

The proof of stability for an observer is very important for it can be used in engineering application. Adopting state-space method to describe the synthetic coordinated control system that is combined with state feedback based on incremental function observer (IFO-KDeltax) merging PID controller and plus intelligent control, the sufficient condition of control system stabilization is given by mathematical analysis. This paper discuss what change will be happen on asymptotic stabile relationship for the IFO-KDeltax when its sufficient and necessary condition can not be given strict assurance due to the inherent characteristics of the controlled object such as uncertainty, slow time variable and so on. Which is applied to a boiler-turbine coordinated control system of a 600 MW generator unit, the validity of the design scheme and correctness of the theory analysis is all testified by the engineering application.