袋式除尘器控制系统建模与仿真分析

Modeling and Simulation Analysis of Bag Filter Control System

针对袋式除尘器控制系统采用开环控制造成的调节时间长和稳态误差大的问题,建立了带有时滞的控制系统状态空间模型,提出了LMI控制器。为进行控制器设计,首先需要建立控制系统的模型,采用流场仿真的方法建立了一种流量和压差的稳态模型,通过稳态物理仿真的方法建立了一种变频器输出频率、电控阀开度、流量和压差的稳态模型,并且提出了一种带有时滞的状态空间模型,利用暂态物理仿真的方法建立了带有时滞的控制系统暂态模型。根据所得的暂态模型,采用LMI控制器对流量和压差进行控制仿真。结果表明:上述模型能够模拟流量和压差的变化特点,LMI控制器的控制效果优于开环控制,为袋式除尘器控制系统的分析和控制器设计提供了理论指导。

In order to solve the problem of long adjusting time and large steady-state error caused by open loop control in bag filter control system,we established the state space model of bag filter control system with time delay and proposed a LMI controller.In order to design the controller,the model of the control system must be established firstly.A steady-state model of air volume and differential pressure was established through flow field simulation.Through steady-state physical simulation,a steady-state model of output frequency of the inverter,opening of the solenoid valve,air volume and differential pressure was built up.On this foundation,a state space model with time delay was proposed.The transient model of bag filter control system was established based on transient physical simulation.A LMI controller was used to control the flow and pressure difference in simulation.The results show that the model can simulate the characteristics of air volume and differential pressure.The control effect of LMI controller is better than that of open loop control,which provides theoretical guidance for the analysis of bag filter control system and the design of controller.