Extended State Observer-Based Sliding-Mode Control for Three-Phase Power Converters

• Published in: IEEE transactions on industrial electronics (1982) Vol. 64; no. 1; pp. 22 - 31
• Main Authors: Jianxing Liu, Vazquez, Sergio, Ligang Wu, Marquez, Abraham, Huijun Gao, Franquelo, Leopoldo G.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.01.2017; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithm design and analysis; Algorithms; Capacitors; Control algorithms; Control theory; Current control; Electric potential; Extended state observer (ESO); Load modeling; Power converters; Power factor; power factor correction; Reactive power; Sliding mode control; sliding-mode control (SMC); State observers; three-phase power converters; Uncertainty; Voltage; Voltage control
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2016.2610400

This paper proposes an extended state observer (ESO) based second-order sliding-mode (SOSM) control for three-phase two-level grid-connected power converters. The proposed control technique forces the input currents to track the desired values, which can indirectly regulate the output voltage while achieving a user-defined power factor. The presented approach has two control loops. A current control loop based on an SOSM and a dc-link voltage regulation loop which consists of an ESO plus SOSM. In this work, the load connected to the dc-link capacitor is considered as an external disturbance. An ESO is used to asymptotically reject this external disturbance. Therefore, its design is considered in the control law derivation to achieve a high performance. Theoretical analysis is given to show the closed-loop behavior of the proposed controller and experimental results are presented to validate the control algorithm under a real power converter prototype.