Sökning: "Multi-terminal"

Visar resultat 6 - 10 av 19 avhandlingar innehållade ordet Multi-terminal.

  1. 6. Control of DC voltage in Multi-Terminal HVDC Transmission (MTDC) Systems

    Författare :Mohammad Nazari; Mehrdad Ghandhari; Nicklas Johansson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : With recent advances in power electronic technology, High-Voltage Direct Current (HVDC) transmission system has become an alternative for transmitting power especially over long distances. Multi-Terminal HVDC (MTDC) systems are proposed as HVDC systems with more than two terminals. These systems can be geographically wide. LÄS MER

  3. 7. Control of a Multi-terminal VSC-HVDC system - A general Control System Structure

    Författare :Evripidis Karatsivos; Industriell elektroteknik och automation; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Environmental impact and security of supply has fuelled a shift in the power mix of power systems today. Traditionally used fossil fuel gives more and more space to the development of renewables in an effort to comply with strict international standards regarding CO2 emissions and secure energy supply. LÄS MER

  4. 8. Modeling of Multi Terminal HVDC Systemsin Power Flow and Optimal Power Flow Formulations

    Författare :Mohamadreza Baradar; Mehrdad Ghandhari; Bertil Berggren; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Nowadays, due to lack of a strong interconnection between electric power systems within EU, there is a concern about the restricted power exchange. On the other hand, one of the factors which results in necessity of improving the level of power exchange is development of renewable energy sources such as offshore wind farms. LÄS MER

  5. 9. 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. 10. Spin-dependant transport in lateral nano-devices based on magnetic tunnel junctions

    Författare :Mattias Urech; Vladislav Korenivski; Bernard Dieny; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Spin diffusion; magnetic tunnel junctions; Physics; Fysik;

    Sammanfattning : This thesis is an experimental study of spin dependent transport in nanoscale ferromagnetic tunnel junction arrays and lateral multi-terminal devices with normal metal and superconducting spin transport channels. Two-, three-, and five-junction arrays have been fabricated in the form of lateral circuits and characterized using variable temperature magneto-transport measurements. LÄS MER