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Showing result 1 - 5 of 7 essays matching the above criteria.

  1. 1. Evaluation of DC Fault Current in Grid Connected Converters in HVDC Stations

    University essay from Uppsala universitet/Institutionen för elektroteknik

    Author : Soham SinhaRoy; [2022]
    Keywords : Symmetrical monopole; HVDC LCC and VSC; CTL; MMC; Converter reactor; DC smoothing reactor; DC pole-to-pole fault; Peak factor; SCC; SCR; PSCAD EMTDC;

    Abstract : The main circuit equipment in an HVDC station must be rated for continuous operation as well as for stresses during ground faults and other short circuits. The component impedances are thus selected for proper operation during both continuous operation and short circuit events. READ MORE

  3. 2. Detection and location of HVDC commutation faults from PMU data

    University essay from Lunds universitet/Industriell elektroteknik och automation

    Author : Alejandro Belinchon Calderon; [2018]
    Keywords : HVDC-links; HVDC converters; Commutation failures; Phasor measurement units PMUs ; Electric power systems; Wide Area Measurement systems WAMS ; Standard IEEEC 37.118; Single-line to ground faults; Three-Phase faults; Fault detection and location; Nordic 32; DigSilent-PowerFactory; PSCAD; MATLAB-Simulink; Symmetrical components.; Technology and Engineering;

    Abstract : Commutation Failures in LCC HVDC converters is a topic that is normally addressed from the component perspective, looking at converters’ internal signals. How these commutation failures affect the outer AC network is not deeply understood yet. READ MORE

  4. 3. Analysis of harmonic cross-modulation in HVDC line-commutated converters for practical design purposes

    University essay from Högskolan Väst/Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik

    Author : Casper Karlsson; [2018]
    Keywords : Power transmission; design; filters;

    Abstract : The use of HVDC has many benefits over HVAC for some specific power transmission purposes. However, two major problems with HVDC links are that the converters produce harmonics and consume reactive power. Electrical filters are used to compensate for this and are a major cost driver of HVDC links. READ MORE

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

    University essay from Uppsala universitet/Institutionen för geovetenskaper

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

    Abstract : 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. READ MORE

  6. 5. A New Cell Bypass Arrangement and Control for Modular Multilevel Converters based on Thyristor Forced Commutation Circuit

    University essay from KTH/Skolan för elektro- och systemteknik (EES)

    Author : Soteris Poyiadjis; [2017]
    Keywords : ;

    Abstract : HVDC transmission lines are a competitive and in some cases are proven to bea superior choice compared to AC transmission applications. Suitable convertershave been developed for that matter where Modulär Multilevel Converters (MMC)are highly preferred due to their low losses, no filtering requirementsand direct andfast control of AC and DC side. READ MORE