According to the characteristics of drum water level system

such as strong disturbance

nonlinear and time varying

a linear auto disturbance rejection control(LADRC)technique was proposed.Moreover

the objective function which is composed of the error and the rate of the controlled variable change was presented.According to the requirement of the actual system

the weighted factor of the objective function was selected

and the optimal solution was searched.Thus

the parameters of the linear auto disturbance rejection controller can be regulated

and parameter adjustion became an optimization problem.The simulation results show that

compared with the conventional PID controller

the linear auto disturbance rejection controller has better control effect in drum level control system

and it makes the system have stronger anti disturbance ability.The controller satisfies the requirement that the change rate in actual control system is limited.The design of the controller has a practical meaning.