Sökning: "High Voltage Direct Current HVDC"

Visar resultat 21 - 25 av 39 uppsatser innehållade orden High Voltage Direct Current HVDC.

  1. 21. Evaluation of critical fault scenarios for operation with inherent overload in HVDC stations

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Elektricitetslära

    Författare :Lisa Sander; [2018]
    Nyckelord :HVDC; Modular multilevel converter; VSC; transient currents; transient voltages; inherent overload; converter bus fault; pole to pole fault;

    Sammanfattning : The HVDC, High Voltage Direct Current, is important when it comes to upgrading the energy system to a renewable, sustainable and efficient system. This master thesis is investigating what is happening during the most decisive fault cases when the HVDC station is operating with inherent overload. LÄS MER

  3. 22. Business analysis of Company A's maintenance organisation

    Master-uppsats, KTH/Industriell produktion

    Författare :Dennis Bremberg; Sina Soltaniah; [2018]
    Nyckelord :;

    Sammanfattning : Existing high voltage direct current (HVDC) stations have an estimated life-cycle of 30 to 40 years.During this time, operations will be subjected to varying disturbances, including spare partobsolescence, new cyber-security requirements, unforeseen failures as well as planned and forcedoutages. LÄS MER

  4. 23. Power Loss Evaluation of Submarine Cables in 500 MW Offshore Wind Farm

    Magister-uppsats, Uppsala universitet/Institutionen för geovetenskaper

    Författare :Lahiru Kushan Jayasinghe; [2017]
    Nyckelord :Power Loss; Offshore Windfarm; Submarine Cables; HVAC; HVDC LCC; HVDC VSC; MATLAB Simulink;

    Sammanfattning : The main objective of this thesis is to develop a new methodology to evaluate the transmission cable losses of wind-generated electricity. The research included the power loss variations of submarine cables in relation to the line length, cable capacity and the transmission technology in an offshore wind farm having a capacity of 500 MW. LÄS MER

  5. 24. Dynamics of an ultra-fast Thomson actuated HVDC breaker

    Master-uppsats, KTH/Maskinkonstruktion (Inst.)

    Författare :Miguel Álvarez Sánchez; [2017]
    Nyckelord :HVDC; Ultra-fast Circuit Breaker; Thomson coil actuator; HVDC; ultra-snabb strömbrytare; Thomson-spole manöverdon;

    Sammanfattning : High Voltage Direct Current (HVDC) is a rapidly growing form of power transmission that offers advantages with respect to conventional AC networks. One of the key elements that will allow the generalization of the HVDC grids is the Circuit Breaker (CB), which has to interrupt high DC currents in extremely short times. LÄS MER

  7. 25. Uppgradering av kretsscheman i en HVDC-station

    M1-uppsats, Högskolan Väst/Avdelningen för data-, elektro- och lantmäteriteknik

    Författare :Daniel Lundstedt; Henrik Nordqvist; [2016]
    Nyckelord :upgrading; circuit diagrams; dirext current; HVDC; LCC; VSC; uppgradering; kretsscheman; likström; HVDC; LCC; VSC;

    Sammanfattning : Detta examensarbete är gjort på uppdrag av ABB i Ludvika. ABB har fått en beställning på en uppgradering av en högspänd likströmstation, på engelska High Voltage Direct Current (HVDC). Det finns huvudsakligen två olika tekniker gällande HVDC. Det är HVDC med Line Commutated Converters (LCC) och HVDC med Voltage Source Converters (VSC). LÄS MER