When the unit operating in deep peak regulation

the control of feed-water pump recirculation needs frequent adjustment. To solve the common problems occurred in the process of steam pump recycling control

the control strategies such as hysteresis feedforward + PID

opening rate sectional limit

variable parameter adjustment

and dynamic lower limit are adopted. Through parameter optimization and adjustment

the control of boiler feed water flow and steam pump flow is more stable in the process of automatic control of steam pump recycling during deep peak load regulation of the unit

the control deviation and overshoot are significantly improved

and the safety and stability of the unit operation in the deep peak regulation stage are effectively improved.