Precision Control for Room Temperature of Variable Air Volume Air-Conditioning Systems with Large Input Delay

Jinfeng Shi, Haoyang Liu and Xiaowei Yang ()
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Jinfeng Shi: China Design Group Co., Ltd., Nanjing 210014, China
Haoyang Liu: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Xiaowei Yang: School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China

Energies, 2024, vol. 17, issue 17, 1-16

Abstract: A large input delay, parametric uncertainties, matched disturbances and mismatched disturbances exist extensively in variable air volume air-conditioning systems, which can deteriorate the control performance of the room temperature and even destabilize the system. To address this problem, an adaptive-gain command filter control framework for the room temperature of variable air volume air-conditioning systems is exploited. Through skillfully designing an auxiliary system, both the filtered error and the input delay can be compensated concurrently, which can attenuate the effect of the filtered error and the input delay on the control performance of the room temperature. Then, a smooth nonlinear term with an adjusted gain is introduced into the control framework to compensate for parametric uncertainties, matched disturbances and mismatched disturbances, which relieves the conservatism of the controller gain selection. With the help of the Lyapunov theory, both the boundedness of all the system signals and the asymptotic tracking performance for the room temperature can be assured with the presented controller. Finally, the contrastive simulation results demonstrate the validity of the developed method.

Keywords: precision temperature control; variable air volume air-conditioning system; input delay; uncertainties and disturbances; adaptive control; command filter (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: 2024
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