摘要
为了实现磨煤机的全程自动启停控制,采用最小二乘方法对磨煤机运行数据进行拟合,建立了磨煤机启动和正常运行过程的动态模型,并基于该模型提出了一种模糊控制与模糊PI控制相结合的复合控制策略。在启动阶段采用模糊控制器控制冷、热一次风挡板;在正常运行阶段,采用模糊PI控制出口风温,入口风量仍采用常规PI控制,并通过MATLAB软件对该控制策略进行仿真验证。结果表明:该控制策略在启动过程中能够保持磨煤机风量稳定,出口温度能够按照预定升温速率上升,在磨煤机正常运行且给煤量扰动工况下,入口风量及出口风温均较常规PI控制动态偏差小。因此,其具有良好的控制效果。
In order to realize closed loop automatic control during whole process of the coal mill,on the basis of the least squares method,the coal mill operation data were fitted and the dynamic model of the coal mill start-up and normal operation was established.Moreover,according to this model,this paper proposes a compound control strategy that combing the fuzzy control with fuzzy PI control.In startup phase,the cold and hot air damper is controlled by the fuzzy controller.In normal operation stage,the outlet air tempera-ture is controlled by the fuzzy PI controller while the inlet air flow is still controlled by the conventional PI controller.The simulation results show that,after this control strategy is adopted,the air volume of the coal mill during start-up process reaches stable and the mill outlet temperature rises according to the prede-termined heating rate.During normal operation of the coal mill and under disturbance conditions for coal, dynamic deviations of both the air flow and mill outlet temperature are smaller than that under the conven-tional PI control.Therefore,this compound control strategy has good control effect.
出处
《热力发电》
CAS
北大核心
2015年第10期52-57,共6页
Thermal Power Generation
关键词
磨煤机
全程自动启停
模糊控制
PI控制
自整定
动态模型
coal mill
automatic startup and stop
fuzzy control
PI control
self-tuning
dynamic model
