Compensation in PID control system for valve stiction based on equivalent-input-disturbance approach

In industrial processes, valve stiction often induces loop oscillations, and limits the control loop performance. To better control the plant with valve stiction, in this paper, the equivalent-input-disturbance (EID) approach is incorporated into the conventional PID control system to improve the ability of disturbance and nonlinearity rejection. The newly proposed method uses a classic two-parameter stiction model to represent the nonlinearity of valve stiction. According to the EID method, an EID estimator is constructed to estimate the influence of valve stiction on the system output. The controller is based on the basic proportional-integral-derivative (PID) control. And a simulation example is provided to demonstrate the validity of this method.

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