Finite Time Disturbance Observer Based on Air Conditioning System Control Scheme

Kamal Rsetam, Mohammad Al-Rawi (), Ahmed M. Al-Jumaily and Zhenwei Cao
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Kamal Rsetam: Department of Automated Manufacturing, Al Khwarizmi College of Engineering, University of Baghdad, Baghdad 10071, Iraq
Mohammad Al-Rawi: Centre for Engineering and Industrial Design, Te Pūkenga—Waikato Institute of Technology, Hamilton 3240, New Zealand
Ahmed M. Al-Jumaily: Institute of Biomedical Technologies (IBTec), Auckland University of Technology (AUT), Auckland 1010, New Zealand
Zhenwei Cao: Faculty of Science, Engineering and Technology, Swinburne University of Technology, Melbourne, VIC 3122, Australia

Energies, 2023, vol. 16, issue 14, 1-28

Abstract: A novel robust finite time disturbance observer (RFTDO) based on an independent output-finite time composite control (FTCC) scheme is proposed for an air conditioning-system temperature and humidity regulation. The variable air volume (VAV) of the system is represented by two first-order mathematical models for the temperature and humidity dynamics. In the temperature loop dynamics, a RFTDO temperature (RFTDO-T) and an FTCC temperature (FTCC-T) are designed to estimate and reject the lumped disturbances of the temperature subsystem. In the humidity loop, a robust output of the FTCC humidity (FTCC-H) and RFTDO humidity (RFTDO-H) are also designed to estimate and reject the lumped disturbances of the humidity subsystem. Based on Lyapunov theory, the stability proof of the two closed-loop controllers and observers is presented. Comparative simulations are carried out to confirm that the proposed controller outperforms conventional methods and offers greater accuracy of temperature, humidity, and carbon dioxide concentration, having superior regulation performance in terms of a rapid finite time convergence, an outstanding disturbance rejection property, and better energy consumption. In addition to presenting the comparative simulation results from the control applications on the VAV system, the quantitative values are provided to further confirm the superiority of the proposed controller. In particular, the proposed method exhibits the shortest settling time of, respectively, 15 and 40 min to reach the expected temperature and humidity, whereas other comparative controllers require a longer time to settle down.

Keywords: air condition system; robust finite time disturbance observer (RFTDO); finite time composite control (FTCC); temperature and humidity control; disturbance rejection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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