Search for dissertations about: "dc-dc power converter"

Showing result 11 - 15 of 33 swedish dissertations containing the words dc-dc power converter.

  2. 11. Design and control of a DC collection grid for a wind farm

    Author : Lena Max; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; DC collection grid; fault handling; DC DC converter; wind energy; control design; loss evaluation;

    Abstract : In this thesis, the internal DC collection grid for a wind farm is investigated regarding the design, losses and dynamic operation for both normal operating conditions and for different fault conditions. The main advantage for the DC collection grid is the considerably lower weight of the 1 kHz transformers in the DC/DC converters compared to the equivalent 50 Hz transformers. READ MORE

  4. 12. Multilevel three-phase dual active bridge dc-dc converters - A study on converter modulation, capacitive energy requirement, ZVS boundaries, MFT's winding connections, and core losses

    Author : Babak Alikhanzadehalamdari; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; high-voltage power converters; dual active bridge; harmonic analysis; three-phase system; medium-frequency transformer; capacitor sizing; multilevel converters; high power-density systems; transformer winding connection; core loss modeling; dc collector network; soft-switching converters;

    Abstract : The collection and transmission of power from offshore wind turbines using dc have advantages over the ac system. One of the enabling technologies for deploying dc collection is the dc-dc converter that boosts the dc output from the turbine to the medium-voltage dc level of the collection grid. READ MORE

  5. 13. Modeling and Analysis of the Interaction of Batteries and Power Electronic Converters

    Author : Rúdi Soares; Oskar Wallmark; Remus Teodorescu; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alternating current; aging; electric vehicles; harmonics; lithium-ion batteries; power converter; resonant filters; ripple; temperature control.; Electrical Engineering; Elektro- och systemteknik;

    Abstract : This thesis deals with the interaction of batteries and power electronic converters in automotive applications. Even if the additional heating caused by (unwanted) alternating currents is disregarded, there has been a concern that alternating currents can be harmful for batteries. READ MORE

  6. 14. Power Control Systems in a Flywheel based All-Electric Driveline

    Author : Janaína Gonçalves de Oliveira; Hans Bernhoff; Mats Leijon; Torbjörn Thiringer; Uppsala universitet; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Flywheels; batteries; electric vehicles; control systems; power electronics; electric machines; efficiency.; Electric power engineering; Elkraftteknik; Electrical engineering; Elektroteknik; Electronics; Elektronik; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : Flywheel systems are attractive in hybrid and electric vehicles due to their ability to handle power during acceleration and braking. The combination of a flywheel device with a battery source has several advantages such as high peak power capacity, high energy density and reduction in the number of charge/discharge cycles of the battery. READ MORE

  7. 15. Grid Connection of Permanent Magnet Generator Based Renewable Energy Systems

    Author : Senad Apelfröjd; Sandra Eriksson; Frans Dijkhuizen; Uppsala universitet; []
    Keywords : VAWT; H-rotor; Tap Transformer; Cascaded H-bridge Multi-Level; Renewable Energy; Wind power; Wave power; Marine Current Power; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

    Abstract : Renewable energy is harnessed from continuously replenishing natural processes. Some commonly known are sunlight, water, wind, tides, geothermal heat and various forms of biomass. The focus on renewable energy has over the past few decades intensified greatly. READ MORE