Superheated Steam Temperature Control Based On Model-free Adaptive Control

In the process of thermal power plant production,super-heater works under the condition of high temperature and high pressure,thus the super-heater steam temperature is the highest one in the steam-water system of a boiler-turbine unit.As a main parameter in the thermal power generating units,superheated steam temperature measurement and control act an important role for power plant safety and economic operation.The superheater is a multi-container link with bigger delay and more inertia.The superheated steam temperature is affected by many disturbance factors.For these different kinds of disturbance factors,the superheated steam temperature control system becomes more and more complex.This paper designs a superheated steam temperature control system in the thermal power plant based on Model-Free Adaptive Control(MFAC).MFAC is one of the data-driven methods and is good at dealing with the system with time-delay,non-linear and perturbation.This paper derives the MFAC law according to MFAC algorithm,then designs the Model-Free Adaptive Control system of the superheated steam temperature,and carries out simulation studies,compares the regulating speed,the stability and the anti-interference ability between MFAC and cascade control,to verify the effectiveness of the designed control system;in order to solve the problem of slow response speed of the system,the MFAC algorithm is improved;because the MFAC parameter tuning is complex,according to the characteristics of the learning step and penalty factor,a parameter self-tuning model control scheme based on Fuzzy is putting forward.At last,the simulation results show that the superheated steam temperature control based on improved Model-Free Adaptive Control has better control performance and faster time response.