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Stability Analysis of Systems with Fuzzy PI Controllers Applied to Electric Drives

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  • Constantin Voloşencu

    (Department of Automation and Applied Informatics, Faculty of Automation and Computers, “Politehnica” University Timisoara, 300223 Timişoara, Romania)

Abstract

This paper analyzes the stability of fuzzy control systems with applications for electric drives. Ensuring the stability of these systems is a necessity in practice. The purpose of the study is the analysis of the dynamic characteristics of the speed control systems of electric drives based on fuzzy PI controllers in the context of performing stability analyses, both internal and input–output, finding solutions to stabilize these systems and provide guidance on fuzzy regulator design. The main methods of treatment applied are as follows: framing the control system in the theory of stability of multivariable non-linear systems, application of Lyapunov’s theory, performing an input–output stability analysis, and verification of the stability domain. The article presents the conditions for correcting the fuzzy controller to ensure internal and external stability, determines the limits of the stability sector, and gives indications for choosing the parameters of the controller. The considerations presented can be applied to various structures for regulating the speed of electric drives which use various PI fuzzy controllers.

Suggested Citation

  • Constantin Voloşencu, 2021. "Stability Analysis of Systems with Fuzzy PI Controllers Applied to Electric Drives," Mathematics, MDPI, vol. 9(11), pages 1-32, May.
    • Handle: RePEc:gam:jmathe:v:9:y:2021:i:11:p:1246-:d:564932
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    References listed on IDEAS

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    1. Yijia Cao & Yong Xu & Yong Li & Jiaqi Yu & Jingrong Yu, 2017. "A Lyapunov Stability Theory-Based Control Strategy for Three-Level Shunt Active Power Filter," Energies, MDPI, vol. 10(1), pages 1-19, January.
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