气动调节阀黏滞故障引起的回路振荡消除方法

气动调节阀的黏滞故障是控制回路中常见的故障,由黏滞引起的回路振荡将会破坏整个控制回路的性能。针对不具有定位器的阀门,提出了利用T-S型模糊控制器代替传统的PI控制器来消除此种振荡。该控制器利用阀门黏滞时被控对象的状态信息与控制器输出变化率之间的关系来构建模糊控制的规则。通过对传统PI控制器的积分系数进行修正使得阀门快速移出黏滞区,最终消除黏滞故障对回路的影响。将该算法应用于实际的液位控制回路中,实验结果表明该算法能够较好地消除回路的振荡,且能够适应不同的设定值,具有一定的鲁棒性。

Elimination Method for the Stiction Induced Control Loops Oscillation

Pneumatic valve stiction fault is often a common problem in control loops,and stiction induced oscillation is the main cause of poor performance in control systems.For valves without a positioner,this paper proposes the use of T-S type fuzzy controller instead of the traditional PI controller to eliminate such oscillations.When the valve is sticky,using the relations between the status information of the controlled object and the change rate of the controller output to build the fuzzy control rules.Adjust the integrator coefficient of traditional PI controller so that the valve can quickly get out of the sticky area and eventually eliminate the impact of stiction on the control loop.The actual level control results show that the compensation algorithm can eliminate control loops oscillation well and the controller is robust enough to adapt to different set values.