Intelligent valve positioner control method based on Smith double fuzzy PID

The valve positioner control system has the characteristics of nonlinear, time-varying, large inertia and pure hysteresis, etc. Aiming at the problems of the conventional PID control algorithm in its control process, such as not high control precision, slow response and poor robustness, a Smith double fuzzy PID compound control method is proposed. The working principle of the intelligent valve positioner is analyzed, and the control precision of the system is improved by combining the dual fuzzy controller and PID controller. The effect of time delay on system performance is improved by designing Smith predictor. The simulation results show that the control method can effectively reduce the overshoot in the control process, improve the system response speed, reduce the steady-state error, and has better robustness. Smith double-fuzzy PID composite control method has advantages and advanced in improving the control accuracy of the valve positioner system.