Search for dissertations about: "turn-off"

Showing result 1 - 5 of 21 swedish dissertations containing the word turn-off.

  1. 1. Compact Modeling of Si and SiC Power Diodes

    Author : Rémy Kolessar; KTH; []
    Keywords : TCAD; power diode; circuit simulation; physics-based modeling; turn-on; turn-off; forward recovery; reverse recovery; silicon; silicon carbide;

    Abstract : .... READ MORE

  2. 2. A new Auxiliary Converter Topology with SiC Components for Railway Applications

    Author : LUYU WANG; Industriell elektroteknik och automation; []
    Keywords : Auxiliary converter; Multilevel converter; ; Silicon Carbide transistors;

    Abstract : Smaller size and lower weight are always the targets of the power electronic product development. This work introduces two new topologies of auxiliary converters which have the feature of fewer components and fewer number of energy conversion stages comparing with the conventional auxiliary converter used in railway applications. READ MORE

  3. 3. On small-signal analysis and control of the single- and the dual-active bridge topologies

    Author : Georgios D. Demetriades; Hans-Peter Nee; Jorma Kyyrä; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electronics; DC-DC converters; Soft-switching; High-frequency; High-power; Bi-directional; Single-Active Bridge; Elektronik; Electronics; Elektronik;

    Abstract : High-frequency dc-dc converters are nowadays widely used in a diversity of power electronic applications. High operating frequencies entail a reduction in size of the passive components, such as inductors, capacitors and power transformers. READ MORE

  4. 4. On the design of hybrid DC-breakers consisting of a mechanical switch and semiconductor devices

    Author : Jesper Magnusson; Göran Engdahl; Staffan Norrga; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; DC; circuit breaker; hybrid breaker; DC systems; DC; brytare; hybridbrytare; likström;

    Abstract : The interest of using direct current in networks for both transmission and distribution of power is increasing due to the higher efficiency compared to the alternating current used today. As no natural zero crossings exist in direct current, the interruption of fault currents becomes a challenge. READ MORE

  5. 5. System Aspects and Modulation Strategies of an HVDC-based Converter System for Wind Farms

    Author : Stephan Meier; Hans-Peter Nee; Boon-Teck Ooi; KTH; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Isolated AC DC Converter; Mutual Commutation; Soft Switching; Voltage Source Converter; Cycloconverter; Modulation Strategies; Medium-Frequency Transformer; HVDC Transmission; Wind Power; Wind Farms; Electric power engineering; Elkraftteknik; Electrical engineering; Elektroteknik;

    Abstract :   In this thesis, a new HVDC-based converter system for wind farms is investigated. It is based on a mutually commutated soft-switching converter system and provides a unique integrated solution for the wind turbine generator drive systems, the wind turbine interconnection, and the power conversion for HVDC transmission. READ MORE