Sökning: "DC"

Visar resultat 21 - 25 av 1349 avhandlingar innehållade ordet DC.

  1. 21. On high-frequency soft-switching DC-converters for high-voltage applications

    Författare :Per Ranstad; KTH; []
    Nyckelord :soft-switching; dc-converter; high-frequency; high-voltage;

    Sammanfattning : .... LÄS MER

  3. 22. Modeling, Control and Protection of Low-Voltage DC Microgrids

    Författare :Daniel Salomonsson; Lennart Söder; Brian K. Johnsson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; circuit transient analysis; dc power systems; dispersed storage and generation; load modeling; power conversion; power distribution control; power distribution faults; power distribution protection; power electronics; Electric power engineering; Elkraftteknik;

    Sammanfattning : Current trends in electric power consumption indicate an increasing use of dc in end-user equipment, such as computers and other electronic appliances used in households and offices. With a dc power system, ac/dc conversion within these loads can be avoided, and losses reduced. LÄS MER

  4. 23. Thin films of YBa2Cu3O7 deposited by co-evaporation, Josephson junctions, and DC-SQUIDS

    Författare :Per-Åke Nilsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; microbridge; Josephson junction; BaF2< sub>; co-evaporation; sub- #956; YBa2< sub>Cu3< sub>O7< sub>; bi-crystal; DC-SQUID; thin film; m;

    Sammanfattning : .... LÄS MER

  5. 24. Analysis of dc-network stability of VSC-based HVDC grids

    Författare :Gustavo Pinares; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; power dependent admittance; resonance; HVDC; passivity; Multi-terminal HVDC system; VSC; dc-network stability;

    Sammanfattning : This thesis presents a modelling approach for the investigation of dc-network stability in HVDC grids. It consists on dividing the system under analysis into subsystems such that their individual impact on the stability of the overall system can be studied. LÄS MER

  7. 25. Design and Optimization of HF Transformers for High Power DC-DC Applications

    Författare :Amin Bahmani; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Increasing the operational frequency is the most common solution to achieve higherpower densities, since the weight and volume of the magnetic part, the bulkiestelement in power electronics converters, are then decreased. This solution is wellestablished in low power high frequency applications, while in the recent decade,the possibility of utilizing high frequency at higher power and voltage levels hasgenerated wide interest as well. LÄS MER