Essays about: "High Voltage Direct Current"

Showing result 11 - 15 of 50 essays containing the words High Voltage Direct Current.

  1. 11. 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

  3. 12. 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

  4. 13. The role of location of low inertia in power systems

    University essay from Uppsala universitet/Institutionen för elektroteknik

    Author : Bashar Alahmad; [2021]
    Keywords : Low inertia; Frequency stability; Rotor-angle stability; Nordic 32; Kundur; PowerFactory; Small-signal stability; Inter-area oscillation; Rate of Change of Frequency.;

    Abstract : The plans to reduce the energy-related greenhouse gas emissions stimulate the deployment of electronically interfaced renewable resources. The increased penetration of such intermittent sources together with phasing conventional power plants out and the installation of High Voltage Direct Current (HVDC) links for long-distance more efficient transmission, reduces the stored inertia in any electrical grid. READ MORE

  5. 14. HVDC transformer core resonance calculation

    University essay from KTH/Lättkonstruktioner, marina system, flyg- och rymdteknik, rörelsemekanik

    Author : Axel Thorstrand; [2021]
    Keywords : HVDC; High Voltage Direct Current; Transformer core; Natural frequencies; Energy method-based equation; HVDC; Högspänning likström; Transformatorkärna; Naturliga frekvenser; Energimetod;

    Abstract : Transformers emit a characteristic humming noise due to magnetostriction which is the continuous change in dimensions during magnetization. The noise is amplified if the induced frequencies match the core’s natural frequencies, consequently avoiding geometries that create resonance is critical in order to fulfill customer sound level requirements. READ MORE

  6. 15. Investigation and Application of Safety Parameters for Lithium-ion Battery Systems

    University essay from KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Author : Axel Relefors; [2020]
    Keywords : Lithium-ion battery; thermal runaway; accelerating rate calorimetry; electrochemical impedance spectroscopy; thermal management; Litiumjonbatteri; termisk rusning; kalorimeter; elektrokemisk impedansspektroskopi; värmereglering;

    Abstract : The Swedish Armed Forces are investigating high-risk applications where lithium-ion batteries (LIB) can replace traditional lead-acid batteries. Understanding the potential safety risks and evaluating a battery's instability is crucial for military applications. READ MORE