再热汽温喷水减温系统串级抗扰PID控制研究OA

A predictive cascade control scheme and an integral-enhanced disturbance rejection PID(DR-PID)control strategy is proposed for the high-order and large-delay characteristics of the reheated steam temperature spraying water process,to achieve cascade disturbance re-jection control of reheated steam temperature under various load condition.Initially,accord-ing to the operational dynamics of the water spraying and cooling process,the cascade control characteristics of the leading and inert zones are analyzed.Subsequently,a cascade control scheme with process state predictive compensation is developed.The predictive compensator is a phase lead term to reduce the phase deviation of the nominal model,providing phase syn-chronized state for inner loop feedback.To deal with the oscillation and overshoot caused by large delay,an integral-enhanced DR-PID control strategy is investigated,which significantly enhances the system's control performance by improving the low-frequency lag characteristics of the integrator.Simulation results demonstrate that the proposed control strategies exhibit excellent disturbance rejection performance and good robustness,fulfilling the requirements of reheated steam temperature control under different load conditions.