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A nonlinear framework for stiction compensation in ratio control loop.

Puneet Mishra1, Vineet Kumar2, K P S Rana2

  • 1Department of Electrical and Electronics Engineering, Birla Institute of Technology and Science, Pilani, Rajasthan 333031, India.

ISA Transactions
|May 11, 2020
PubMed
Summary
This summary is machine-generated.

A novel nonlinear proportional integral controller (NPIC) effectively suppresses oscillations in ratio control loops caused by sticky control valves. Experimental results show NPIC outperforms conventional methods in handling measurement noise and setpoint variations.

Keywords:
Limit cyclesNonlinear PI controllerPneumatic control valveRatio controlStiction

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Area of Science:

  • Control Engineering
  • Process Control
  • Nonlinear Systems

Background:

  • Stiction nonlinearity in control valves is a significant challenge, inducing limit cycles and oscillations.
  • Ratio control loops are particularly susceptible due to measurement noise and inner loop setpoint variations.
  • Existing control strategies often struggle to effectively mitigate these issues in the presence of valve stiction.

Purpose of the Study:

  • To investigate a nonlinear control-cum-compensation framework, the nonlinear proportional integral controller (NPIC).
  • To suppress unwanted oscillations in ratio control loops caused by stiction nonlinearity.
  • To compare the performance of NPIC against conventional and state-of-the-art control schemes.

Main Methods:

  • Development and implementation of a nonlinear proportional integral controller (NPIC).
  • Experimental investigation of NPIC in a ratio control loop with a sticky pneumatic control valve.
  • Comparative performance analysis against other advanced and traditional control strategies.

Main Results:

  • The NPIC demonstrated superior performance in suppressing oscillations compared to other controllers.
  • NPIC effectively managed the challenges posed by measurement noise and setpoint variations in the inner loop.
  • Significant reduction in limit cycles and improved stability were observed when using the NPIC.

Conclusions:

  • The nonlinear proportional integral controller (NPIC) is a highly effective solution for ratio control loops with sticky valves.
  • NPIC offers a robust and advanced control strategy for mitigating oscillations and improving process performance.
  • This framework provides a promising approach for enhancing the reliability of industrial control systems.