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National Repository of Grey Literature 3 records found  Search took 0.00 seconds. 
Robust control of electromechanical systems
 Pohl, Lukáš ; Václavek, Pavel (referee) ; Blaha, Petr (advisor)
This thesis deals with the modern control approaches applicable to speed control of an induction motor. Historical perspective to the control theory and its evolution to the modern control will be presented in a short introduction. Basics of uncertainty modeling are presented along with linear fractional transformation (LFT) representation of an uncertain system. Two different approaches for robust controller synthesis are introduced - H-infinity loopshaping and mixed sensitivity H-infinity synthesis. Theoretical background is presented for both of these methods. Finally the robust controller for induction motor satisfying the control goals is designed using both methods. Design objectives are presented as transfer function weights shaping the sensitivity or complementary sensitivity function to desired shape. Several step responses were simulated to compare H-infinity loopshaping and mixed sensitivity H-infinity controllers with the conventional vector control approach.
Detailed record
Robust control of electromechanical systems
 Pohl, Lukáš ; Václavek, Pavel (referee) ; Blaha, Petr (advisor)
This thesis deals with the modern control approaches applicable to speed control of an induction motor. Historical perspective to the control theory and its evolution to the modern control will be presented in a short introduction. Basics of uncertainty modeling are presented along with linear fractional transformation (LFT) representation of an uncertain system. Two different approaches for robust controller synthesis are introduced - H-infinity loopshaping and mixed sensitivity H-infinity synthesis. Theoretical background is presented for both of these methods. Finally the robust controller for induction motor satisfying the control goals is designed using both methods. Design objectives are presented as transfer function weights shaping the sensitivity or complementary sensitivity function to desired shape. Several step responses were simulated to compare H-infinity loopshaping and mixed sensitivity H-infinity controllers with the conventional vector control approach.
Detailed record
Graphical user interface for filter design in frequency domain
 Řezáč, M. ; Holub, O. ; Augusta, Petr ; Hurák, Z.
The paper presents Matlab graphical user interface(GUI) for frequency domain design of filters and shows its application on a practical example of controller design for laboratory system with flexible arm. GUI helps to simplify the procedure of H_infty optimization based loopshaping controller design. This Metod is describe in detail e.g. in the book [Skogestad a Postlethwaite, 2005]. The method inputs are, besides the controller plant, so-called weighting filters, that represent control goals.
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