自抗扰控制在循环流化床锅炉床温控制中的应用

Application of active disturbance rejection control in bed temperature control of circulating fluidized bed boiler

床温是循环流化床锅炉燃烧控制系统中的一个重要指标。它的稳定与否直接影响着锅炉的燃烧效率和污染物排放速率。在燃烧过程中,它具有时变性、大惯性和大滞后的特点。针对这一问题将自抗扰控制算法应用于循环流化床锅炉床温控制,并将仿真结果与PID控制方法的仿真结果进行了比较。研究表明:ADRC在超调量、调节时间上均优于常规PID方法,在各种工况以及增加外扰情况下,该自抗扰控制方案具有良好的鲁棒性和抗干扰能力,解决了该系统时变、大延迟的控制难点。

The bed temperature is an important parameter for a CFB （circulating fluidized bed） boiler. Wheather it is stable or not directly influences the boiler overall efficiency and the rate of pollutants emission. At the same time, the bed temperature control system is an uncertain system with large inertia and lag. Directing against the problems, the active disturbance rejection control （ADRC） was used to bed temperature control in a circulating fluidized bed boiler （CFBB）. The simulation results were compared with those obtained by using PID control method. It was found that the overshooting and regulation time duration of the ADRC are superior to those of the convention PID method under various operating conditions and with an increase of disturbance from the outside, the ADRC presents a good robustness and disturbance-resistant capability, thus solved the difficulties in controlling the time variation and long time delay of the system.