Sökning: "vector current control"

Visar resultat 1 - 5 av 41 avhandlingar innehållade orden vector current control.

  1. 1. Analysis and Control Aspects of Brushless Induction Machines with Rotating Power Electronic Converters

    Författare :Naveed ur Rehman Malik; Chandur Sadarangani; Luca Peretti; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; Doubly-fed induction generator; extended vector control; induction machine; internal model control; Lindmark concept; low voltage ride through; passive resistive network; rotating power electronic converter; rotating exciter; symmetrical faults; synchronous machine; unity power factor; unsymmetrical faults; vector control; wind turbines.; Järnvägsgruppen - Elsystem; Järnvägsgruppen - Elsystem;

    Sammanfattning : This thesis deals with the steady-state, dynamic and control aspects of new type of brushless configuration of a doubly-fed induction machine in which the slip rings and carbon brushes are replaced by rotating power electronics and a rotating exciter. The aim is to study the stability of this novel configuration of the generator under mechanical and grid disturbances for wind power applications. LÄS MER

  2. 2. On Control of Back-to-Back Converters and Sensorless Induction Machine Drives

    Författare :Rolf Ottersten; Chalmers University of Technology; []
    Nyckelord :active filtering; flux estimation; sensorless control; induction motor; back-to-back converter; pulsewidth-modulated rectifier; virtual flux; vector current control;

    Sammanfattning : This thesis focuses on design and analysis of the control system structure for back-to-back converter squirrel-cage induction machine drives. Particularly, sensorless control of induction machines, meaning vector control without a mechanical shaft sensor, and vector control of pulsewidth-modulated (PWM) rectifiers are considered. LÄS MER

  3. 3. On Control of Permanent-Magnet Synchronous Motors in Hybrid-Electric Vehicle Applications

    Författare :Oskar Wallmark; Chalmers University of Technology; []
    Nyckelord :phase-locked loop; signal injection; Electric drive; sensorless control; harmonics; position estimation; speed estimation; hybrid-electric vehicle; permanent-magnet synchronous motor; electric vehicle; vector control;

    Sammanfattning : This thesis deals with design and analysis of the control system structure for electric drives equipped with permanent-magnet synchronous motors with a salient rotor. The intended application is propulsion in electric- and hybrid-electric vehicles. LÄS MER

  4. 4. On Fault Detection, Diagnosis and Monitoring for Induction Motors

    Författare :Mohammed Obaid Mustafa; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Model based fault detection and diagnosis; Model free fault detection; Set Membership Identification SMI ; Uncertainty Bounds Violation Method; Model based Support Vector Classification; Linear and Nonlinear Classification; Minimum Volume Ellipsoid method; Broken Rotor Bars; Faults of Induction Motors; Three phase induction motor; Reglerteknik; Control Engineering;

    Sammanfattning : In this thesis, multiple methods and different approaches have been established and evaluated successfully, in order to detect and diagnose the faults of induction motors (IMs). The aim of this thesis is to present novel fault detection and isolation methods for the case of induction machines that would have the merit to be implemented online and being characterized by specific novel capabilities, when compared with the existing techniques. LÄS MER

  5. 5. Towards Mosquitocides for Prevention of Vector-Borne Infectious Diseases : discovery and Development of Acetylcholinesterase 1 Inhibitors

    Författare :Sofie Knutsson; Anna Linusson; Fredrik Almqvist; Andreas Larsson; Ulf Nilsson; Umeå universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Mosquito; vector-borne diseases; vector control; insecticide; acetylcholinesterase; medicinal chemistry; high-throughput screening; organic synthesis; homology modeling; structure activity relationship; structure selectivity relationship; datorlingvistik; computational linguistics; organisk kemi; Organic Chemistry;

    Sammanfattning : Diseases such as malaria and dengue impose great economic burdens and are a serious threat to public health, with young children being among the worst affected. These diseases are transmitted by mosquitoes, also called disease vectors, which are able to transmit both parasitic and viral infections. LÄS MER