Accurate acquisition of steam turbine regulating valve's characteristics is precondition for unit load control.On the premise of obtaining the turbine valve's characteristics through field tests

establishing mathematical model for the turbine regulating valve's characteristics will make the theoretical analysis and calculation be easier.In this paper

the data fitting method was applied to build up a mathematical relationship between and among steam flow

valve opening and valve position instruction.Then

the flow calibration method was employed to optimize the opening degree of the valve.Finally

BP nerve network was used to simulate the relationship between the valve position and the steam flow.The experimental results show that this method can improve the reliability of the optimization.