Against the characteristics of large delay and large lag of combustion system in circulating fluidized bed boilers

a two degree of freedom model driven PID(TDOF MD PID)controller was designed by taking main steam pressure as the controlled object

on the basis of the conventional PID control system.Moreover

the effect of coal quantity on the main steam pressure was analyzed

and control performance of the TDOF MD PID controller and the conventional PID controller was compared by simulation test.The results show that

the TDOF MD PID controller has simple structure

convenient parameter adjustment

and strong robustness and anti-interference

which can improve dynamic control quality of the control system effectively.