Cascade PID control of desuperheating water system of supercritical power generation unit once-through boiler

The stability control problem of desuperheating water system of supercritical power generation unit once-through boiler is studied in this paper. The cascade PID control strategy is adopted and applied to desuperheating water control system. Because the valve opening of the desuperheating water regulator can be adjusted in real time with the unit load changing, the controlled system can maintain the main steam temperature in a stable working condition, ensures the security and stability of unit operating, and improves the anti-interference ability of closed-loop control system.