Search for dissertations about: "symmetrical components"

Showing result 1 - 5 of 16 swedish dissertations containing the words symmetrical components.

  1. 1. Three-phase unbalance of voltage dips

    University dissertation from Chalmers University of Technology

    Author : Lidong Zhang; Chalmers tekniska högskola.; Chalmers University of Technology.; [1999]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power systems; power quality; voltage dips sags ; symmetrical components; characterisation; field measurement; equipment immunity test;

    Abstract : .... READ MORE

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

    University dissertation from Stockholm : KTH Royal Institute of Technology

    Author : Naveed ur Rehman Malik; KTH.; [2012]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 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;

    Abstract : 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. READ MORE

  3. 3. Design of High-Speed Analog-to-Digital Converters using Low-Accuracy Components

    University dissertation from Linköping : Linköping University Electronic Press

    Author : Timmy Sundström; Linköpings universitet.; Linköpings universitet.; [2011]

    Abstract : The scaling of CMOS technologies has increased the performance of general purpose processors and DSPs. However, analog circuits designed in the same process have not been able to utilize the scaling to the same extent, suffering from reduced voltage headroom and reduced analog gain. READ MORE

  4. 4. High-frequency noise in power grids, neutral and protective earth

    University dissertation from Luleå : Luleå tekniska universitet

    Author : Martin Lundmark; Luleå tekniska universitet.; [2006]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Energy Engineering; Energiteknik;

    Abstract : This licentiate thesis deals with the high-frequency distortion, 1 kHz and higher, introduced into the power grid by the numbers of power converters in use today. These devices can be a source of electromagnetic interference and equipment damage despite the fact that the equipment complies product-standards testing. READ MORE

  5. 5. Differential Protection for Arbitrary Three-Phase Power Transformers

    University dissertation from Department of Industrial Electrical Engineering and Automation, Lund Institute of Technology

    Author : Zoran Gajic; Lunds universitet.; Lund University.; [2008]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electric power systems; power transformers; differential protection; power system protection;

    Abstract : This thesis describes how to provide standardized, current based, differential protection for any three-phase power transformer, including phase-shifting transformers with variable phase angle shift and transformers of all construction types and internal on-load tap-changer configurations. The use of standard transformer differential protection for such applications is considered impossible in the protective relaying standards and practices currently applied. READ MORE