A novel unified method for time-varying dead-time compensation. (February 2021)

• Record Type: Journal Article
• Authors: Morato, Marcelo M.; Normey-Rico, Julio E.
• Is Part Of: ISA transactions. Volume 108(2021)
• Page Start: 78
• Page End: 95
• Publication Date: 2021-02
• Subjects: Time-varying delay -- Dead-time compensators -- Filtered Smith Predictor -- Linear Parameter Varying Systems -- Robustness; Engineering instruments -- Periodicals; Engineering instruments; Periodicals; Electronic journals; 629.805
• DOI: 10.1016/j.isatra.2020.08.018
• Languages: English
• ISSNs: 0019-0578

Abstract

Abstract: This paper proposes an unified procedure for time-varying dead-time compensation. The method is an adapted version of the Filtered Smith Predictor (FSP), which is coupled to a delay estimation scheme and two adaptive Linear Parameter Varying (LPV) blocks. These LPV blocks allow the DTC to autonomously regulate the amount of closed-loop robustness, with respect to the (estimated) amount of delay. The method is easily adjustable and can be tuned to provide a balance between robustness and performance objectives, while being able to deal with unstable and integrative processes. A series of numerical simulations are included to illustrate the advantages of the proposed method towards reference tracking, noise attenuation, disturbance rejection and uncertainty handling. This novel DTC enables enhanced performances with respect other methods from the literature. Highlights: A Novel method for time-varying dead-time compensation is developed, based on the Filtered Smith Predictor. A robust stability theorem for uncertain time-varying delays is proposed. Simulations are given for stable, integrative and unstable processes.