Abstract
A robust polynomial observer is designed based on passive synchronization of a given class of fractional-order Colpitts (FOC) systems with mismatched uncertainties and disturbances. The primary objective of the proposed observer is to minimize the effects of unknown bounded disturbances on the estimation of errors. A more practicable output-feedback passive controller is proposed using an adaptive polynomial state observer. The distributed approach of a continuous frequency of the FOC is considered to analyze the stability of the observer. Then we derive some stringent conditions for the robust passive synchronization using Finsler’s lemma based on the fractional Lyapunov stability theory. It is shown that the proposed method not only guarantees the asymptotic stability of the controller but also allows the derived adaptation law to remove the uncertainties within the nonlinear plant’s dynamics. The entire system using passivity is implemented with details in PSpice to demonstrate the feasibility of the proposed control scheme. The results of this research are illustrated using computer simulations for the control problem of the fractional-order chaotic Colpitts system. The proposed approach depicts an efficient and systematic control procedure for a large class of nonlinear systems with the fractional derivative.
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Acknowledgements
We thank Prince Sultan University, Riyadh, Saudi Arabia for supporting this research. Our gratitude also goes to Robotics and Internet-of-Things Lab (RIOTU), Prince Sultan University, Riyadh, Saudi Arabia. Reviewers’ valuable comments have improved the presentation of this paper.
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Alain Soup Tewa KAMMOGNE conceived and designed the research, contributed reagents, analysis tools or data, and interpreted the data. Ahmad Taher AZAR contributed reagents, materials, analysis tools or data. Michaux Noubé KOUNTCHOU, Romanic KENGNE, and Soup Teoua Michael OUAGNI performed the experiments. Michaux Noubé KOUNTCHOU analyzed the data. Alain Soup Tewa KAM-MOGNE and Soup Teoua Michael OUAGNI drafted the paper. Alain Soup Tewa KAMMOGNE, Hilaire Bertrand FOTSIN, and Ahmad Taher AZAR revised and finalized the paper.
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Alain Soup Tewa KAMMOGNE, Michaux Noubé KOUNTCHOU, Romanic KENGNE, Ahmad Taher AZAR, Hilaire Bertrand FOTSIN, and Soup Teoua Michael OUAGNI declare that they have no conflict of interest.
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Kammogne, A.S.T., Kountchou, M.N., Kengne, R. et al. Polynomial robust observer implementation based passive synchronization of nonlinear fractional-order systems with structural disturbances. Front Inform Technol Electron Eng 21, 1369–1386 (2020). https://doi.org/10.1631/FITEE.1900430
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DOI: https://doi.org/10.1631/FITEE.1900430
Key words
- Robust passive observer
- Adaptive synchronization
- Lyapunov theory
- Fractional-order
- Polynomial observer
- Uncertain parameters
- H∞-performance