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Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Design and application of discrete wavelet packet transform based multiresolution controller for liquid level system.

Rimi Paul1, Anindita Sengupta2

  • 1EE department, Aliah University, New Town, Action Area II, A/27, Kolkata 700156, West Bengal, India.

ISA Transactions
|August 16, 2017
PubMed
Summary
This summary is machine-generated.

A novel discrete wavelet packet transform (DWPT) controller offers superior performance for liquid level systems (LLS), outperforming traditional methods in speed and noise rejection. It effectively manages process dynamics and disturbances, even when compared to controllers with anti-windup techniques.

Keywords:
Anti-wind up PI controllerDiscrete wavelet packet transform based PI controllerDiscrete wavelet transform based PI controllerLiquid level systemMinimum description lengthProportional-Integral controller

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Area of Science:

  • Control Systems Engineering
  • Signal Processing
  • Process Automation

Background:

  • Liquid level systems (LLS) are crucial in industrial processes but are susceptible to dynamics, noise, and disturbances.
  • Conventional controllers like Proportional Integral (PI) controllers may struggle with complex system behaviors and noise.
  • Existing wavelet-based controllers show promise but can be improved for enhanced performance.

Purpose of the Study:

  • To introduce a new controller based on Discrete Wavelet Packet Transform (DWPT) for LLS.
  • To evaluate the DWPT controller's performance against Discrete Wavelet Transform (DWT) and conventional PI controllers.
  • To assess the controller's effectiveness in handling noise, disturbances, and actuator saturation (wind-up).

Main Methods:

  • Development of a novel controller utilizing DWPT for generating control signals from error signal coefficients.
  • Simulation-based comparison of the DWPT controller with DWT-based and conventional PI controllers on an LLS.
  • Implementation and comparison of an anti-windup technique for the PI controller against the DWPT controller.

Main Results:

  • The DWPT controller demonstrated faster response times compared to DWT and PI controllers in LLS simulations.
  • The DWPT controller exhibited superior noise rejection capabilities.
  • The DWPT controller outperformed the PI controller with anti-windup in handling actuator saturation.

Conclusions:

  • The proposed DWPT controller offers significant advantages in speed and noise suppression for LLS.
  • DWPT-based control is a robust alternative to conventional methods, especially in the presence of noise and disturbances.
  • The controller's effectiveness extends to various plant types, including first and second-order systems.