Essays about: "HVdc"

Showing result 16 - 20 of 108 essays containing the word HVdc.

  1. 16. Transmission line protection performance in presence of power electronic-interfaced devices : Impact and needed countermeasures in the Swedish transmission system

    University essay from Uppsala universitet/Elektricitetslära

    Author : Hanna Olofsson; [2021]
    Keywords : ;

    Abstract : The penetration level of power electronic-interfaced devices (PEID:s) in power systems isincreasing, including wind- and solar power, HVDC and FACTS devices. Fault current injectedby PEID:s is lower in magnitude, may lack or contain a reduced negative sequence componentand can have a wide range of phase angles, as opposed to fault current supplied bysynchronous generators (SG:s). READ MORE

  3. 17. Measurement system for pre-discharge currents in HVDC tests

    University essay from Uppsala universitet/Institutionen för elektroteknik

    Author : Saga Dalersand; Edvin Bäckstadi; Fredrik Gjöthlén; [2021]
    Keywords : ;

    Abstract : To measure the current impulses before a discharge process in an insulation material is completed a proposed system has been built theoretically. The blocks in the system have been studied by going through relevant sources and meetings with the supervisor of the project and new ideas have been considered. READ MORE

  4. 18. Transient Waveform Clustering : Developing efficient data analytics toolchains applying unsupervised machine learning techniques on power quality events

    University essay from Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

    Author : Albert Varghese Rajan; [2021]
    Keywords : HVDC; Power Quality; Machine Learning; Autoencoder; Clustering; Monitoring and analytics;

    Abstract : High Voltage Direct Current (HVDC) transmission systems appropriate for bulk power transfer to meet increasing power demands and ideal for interconnecting power systems with distant renewable sources of energy without any chances of loss synchronism, efficiency, and reliability. The main obstacle is however connected with the DC grid protection where the timely diagnosis of faults is critical to prevent any rapid built-up leading to failure of the power electronic devices. READ MORE

  5. 19. Protection of HVDC Grids Against Blackouts (Simulation)

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Amal Al-Ammari; Dinah Atchan; [2021]
    Keywords : High Voltage Direct Current HVDC ; Voltage derivative dv=dt algorithm; Traveling wave algorithm; PSCAD simulation; Multi-terminal grid; Fault detection; Threshold value; Offshore HVDC; DC breaker; Voltage collapse;

    Abstract : In the search for green energy to combat climatechange, a shift from conventional energy sources such as coal,oil, and nuclear towards Renewable Energy Sources (RES) isneeded. This shift poses a threat to the stability of the powergrids as RES do not contribute with rotating mass in the system. READ MORE

  6. 20. Frequency regulation in the Nordic synchronous system : The possibility for solar parks to provide ancillary services

    University essay from KTH/Skolan för industriell teknik och management (ITM)

    Author : LOVISA RENDERT; PETER CVITANOVIC; [2021]
    Keywords : ;

    Abstract : The Paris Agreement stipulates that the participating countries and areas agree to work toward limiting the global average temperature increase “to well below 2°C above pre-industrial levels and pursuing efforts to limit the temperature increase to 1.5°C above pre-industrial levels” (The United Nations, 2015). READ MORE