Research and application of modeling method based on balance points of controlled object

Research of mathematical model is an important work in control filed. According as the abstract concept of the Hammerstein model, this paper studies modelling method based on balance points of controlled object, taking objects of thermal control field as research background, establishes corresponding mathematical models of coordinate controlled object for boiler-turbine generator units whose boilers are respectively deployed with steam drum boiler, subcritical press once-through boiler or supercritical press once-through boiler. And the models are confirmed by some projects experiment. Mathematical analysis to a pathological mathematical model is given. A method to validate mathematical model has presented. Another method to estimate system dynamic responds with some uncertainty has proposed by design and application of an observer of coal calorific value. Its validity and practicability has been testified by project practice too.