Model Of Inverse Dynamics And Application On The Object Of Steam Temperature For Boiler

Inverse dynamics of thermodynamic system is a newly research field. It has become one of the key problems and basal problems in many research and application fields. The research methods of Inverse dynamics problems have important effects on system stability, optimum control, fault diagnosis and thermodynamic measuring.With power developing, modern generating units mostly adopt high-capacity, heavy-parameter, and high-efficiency boilers that the control system of superheated steam temperature becomes more complex for its inertia and delay strengthened. The PID control as one of conventional control method hardly meets the need of superheated steam temperature control due to its actual system has subjected to the influences of complexity, nonlinearity, time-variation and uncertainty factors. The control of superheated steam temperature is one of key puzzles for improving automatic level of electric power plant.For the problems lie in the control of superheated steam temperature, this paper brings a new control strategy from the essence of control that optimizing operation and control that defines the input of system for the expected operating mode and output of the system by inverse dynamics. Regarding superheated system of boiler as a whole body, build the model of inverse dynamics for superheated steam temperature. According to the goal of control for superheated steam temperature (the output of thermodynamic system), define controlled quantity of superheater (the input of thermodynamic system) by solving model of inverse dynamics, so that realizes the control of superheated steam temperature.The inverse dynamics model of superheated steam temperature is complex, nonlinear, whose solution is get more difficult by general method. The paper details the structure of inverse dynamics model, utilizes the ability of genetic algorithms to seek optimum solution in large range; find the optimum output about the inverse dynamics model of superheated steam temperature. Adopt adaptive genetic algorithms to solve the model. Otherwise, in process of solving inverse dynamics model based on object model, the paper realizes object model of identification.Inverse dynamics model is applied to the superheated steam temperature control, controlling the steam temperature with disturbances of load, flue gas flow and temperature, steam temperature of the inlet and setting value. With simulation, we can...