Adaptive PID Control of Main Steam Temperature of Boiler in Power Plant

Pseudo-linear mathematic model of thermal process object is proposed to conduct relations between parameters of PID controller and thermal process model when operating conditions change,and a new regulation algorithm of parameters of PID controller is established.Gain function can be obtained by theory analysis of thermal process object or by statistic analysis of operating data under stable conditions.Relation between derivative time function and integral time function can be determined according to no oscillation principle in controller.The number of regulation parameters of PID controller is reduced from three to one,which simplifies online regulation algorithm.Aimed at process object of boiler main steam temperature,a new algorithm based on the criterion of dynamic overshoot is used to regulate parameters of PID controller in real time,and this improves control quality of boiler main steam temperature system.The new algorithm is verified by an example.