先进PID在锅炉汽包水位控制中的应用研究

锅炉是化工、炼油、发电等工业生产过程中不可或缺的重要动力设备。针对锅炉汽包水位的反向特性,采用一种预测PID控制方法并应用于锅炉汽包水位的三冲量控制系统,即内环采用PID控制快速消除控制通道的给水扰动,外环采用预测PI控制用以克服蒸汽流量变化产生的扰动。仿真结果表明了所获得的理想控制效果以及控制系统的鲁棒性。

Predictive PI Control of Water Level of Boiler Drum

Boiler is an indispensably important power equipment in industrial process of chemical,oil and power generation. Considering the reverse characteristics of water level of boiler drum, a predictive PID control strategy is used to the three impulses control system of water level of boiler drum, that is, PID control is used in inner loop to overcome water supplying disturbance of control path and predictive PI is used in outer loop to attenuate the disturbance because of changing of steam flow rate. Simulation results show that ideal control performance is acquired and the robustness of the proposed control strategy.