On the Robust Control of Buck-Converter DC-Motor Combinations

• Published in: IEEE transactions on power electronics Vol. 28; no. 8; pp. 3912 - 3922
• Main Authors: Sira-Ramirez, Hebertt, Oliver-Salazar, M. A.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.08.2013; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active control; Active disturbance rejection control; Applied sciences; cascaded buck converters; Circuit properties; Convertors; DC motors; Demand; Differential equations; Direct current; Disturbances; Electric currents; Electric motors; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electrical machines; Electronic circuits; Electronics; Equations; Estimates; Exact sciences and technology; generalized proportional integral (GPI) observer; Mathematical model; Observers; Power electronics, power supplies; Power supply; Regulation and control; Rejection; Signal convertors; Simulation; time-varying loads; Topology; Vectors; Power converter; Disturbance rejection; generalized proportional integral (GPI) observer; Time variation; Regulation(control); Active system; Observer; Robustness; Electric motor; Time signal; Dc motor; Active control; cascaded buck converters; Control system; Power electronics; Topology; Active disturbance rejection control; DC-DC power convertors; Robust control; Step down convertor; System simulation; Energy demand; time-varying loads; Gain; Cascade connection
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/TPEL.2012.2227806

The concepts of active disturbance rejection control and flatness-based control are used in this paper to regulate the response of a dc-to-dc buck power converter affected by unknown, exogenous, time-varying load current demands. The generalized proportional integral observer is used to estimate and cancel the time-varying disturbance signals. A key element in the proposed control for the buck converter-dc motor combination is that even if the control input gain is imprecisely known, the control strategy still provides proper regulation and tracking. The robustness of this method is further extended to the case of a double buck topology driving two different dc motors affected by different load torque disturbances. Simulation results are provided.