机械制浆过程磨机负荷内模PI控制

Internal Model PI Control of Refiner Load for Mechanical Pulping Process

针对双盘磨机在运行过程中具有大滞后、大惯性及非线性等特点,内模控制作为一种先进控制策略,鉴于其对过程模型精度要求不高等优点,提出了一种基于内模控制原理的PI控制方法,该方法设计的控制器仅有一个可调参数,且通过最大灵敏度指标实现其整定,有效避免了控制器整定的复杂性与随机性.仿真结果表明,与常规PID控制相比,所提方法可有效减小模型参数变化及各种干扰对系统性能的影响,满足机械制浆生产过程对控制器性能的要求,保证磨机安全稳定运行,实现了磨机负荷的稳定化控制,为机械制浆过程综合自动化系统的实施奠定基础.

The double disks refiner has large time delay, large inertia and nonlinear characteristics during operation, whereas the internal model control, as an advanced control strategy, given its advantages of not requiring high accuracy in the process model. A PI control method was proposed based on internal model control principle, which has only one adjustable parameter in the designed controller, achieving tuning by maximum sensitivity indicator, thus the complexity and randomness of controller tuning could be effectively avoided. Simulation results show that, compared with the conventional PID control, the model parameters variations and alleviate various interference on system performancecan be effectively reduced by using the proposed method, and the requirements of mechanical pulping process for controller properties can be satisfied to ensure the stable control of the mill load, laying the foundation for the implementation of the integrated automation system for pulping process.