Model-free adaptive nonlinear control of the absorption refrigeration system

Na Dong, Wenjin Lv, Shuo Zhu, Zhongke Gao, Celso Grebogi

Research output: Contribution to journalArticlepeer-review

Abstract

Based on the model-free adaptive control (MFAC) theory, the temperature tracking control problem of single-effect LiBr/H2O absorption chiller is explored. Due to the complex nonlinearity and strong coupling characteristics of the absorption refrigeration system, model-free adaptive control strategy is designed for its temperature tracking control. Nevertheless, the traditional model-free adaptive control has a slow tracking speed and poor denoising ability. In order to improve its control effect, output error rate is added to the objective function and new control laws of model-free adaptive control with output error rate (MFAC-OER)y have been derived through an exhaustive convergence and stability analysis. The input and output information of the absorption refrigeration system, namely the hot water pump frequency and frozen water outlet water temperature, are combined. The data model of the absorption refrigeration system is subsequently deduced using a compact format dynamic linearization method
Original languageEnglish
JournalNonlinear Dynamics
Publication statusAccepted/In press - 2 Oct 2021

Keywords

  • model-free adaptive control (MFAC)
  • output error rate
  • absorption chiller

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