Sökning: "RoCoF"

Visar resultat 1 - 5 av 6 uppsatser innehållade ordet RoCoF.

  1. 1. Relay settings for frequency derivative protection against islanding : Optimizing RoCoF-Hysteresis and Delay for the Swedish power grid: An investigation of relevant values

    M1-uppsats, KTH/Hälsoinformatik och logistik

    Författare :Ahmad Safari; [2023]
    Nyckelord :Islanding; unintentional islanding; distributed energy resources; main grid; RoCoF; hysteresis; delay; Ödrift; oavsiktlig ödrift; distribuerade energiresurser; stamnät; RoCoF; hysteres; fördröjning;

    Sammanfattning : This report addresses the parameter settings for a protective relay designed to safeguard a 15 kW wind turbine located in Rimbo, Norrtälje municipality, against unintentional islanding. This type of situation arises when distributed energy resources continue to supply local loads, even if the main grid has been unintentionally disconnected. LÄS MER

  3. 2. Evaluation of key performance indices for frequency quality : A method for evaluating frequency stability in the Nordic power system

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Sophia Larbi Engelbrektsson; [2023]
    Nyckelord :Ancillary Services; Kinetic Energy; Frequency Dependent Load; Frequency Stability; Frequency Quality; KPI; Nordic Power System; Frekvensberoende Last; Frekvenskvalité; Frekvensstabilitet; Kinetisk Energi; Nordiska Elsystemet; Nyckeltal; Stödtjänster;

    Sammanfattning : The Nordic power system is in a changing phase, with more power electronic interfaced connections, and HVDC connections to other synchronous areas, which impacts the frequency quality. This is a challenge for the transmission system operator of Sweden, Svenska Kraftnät, who, with the other Nordic transmission system operators, is responsible for the physical balancing of the Nordic power system. LÄS MER

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

    Master-uppsats, Uppsala universitet/Institutionen för elektroteknik

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

    Sammanfattning : 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. LÄS MER

  5. 4. Anti-Islanding Protection in Distribution Grids

    Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Jianan Zhang; [2019]
    Nyckelord :;

    Sammanfattning : The growing number of distributed generation in the electrical system increasesthe risk of unintentional islanding. Power system islanding is the eventthat a part of the grid is continuously powered by the distributed generation,while it is already electrically separated from the power grid[1]. LÄS MER

  7. 5. Investigation of Frequency Containment Reserves With Inertial Response and Batteries

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Hashem Ghasemi; Jakob Melki; [2019]
    Nyckelord :Frequency Containment Reserves; Inertial Response; Instantaneous Frequency Deviation; Battery Energy Storage System;

    Sammanfattning : The rise of Renewable Energy Sources (RES) such as wind and solar power, creates new challenges for electric power systems. One of these challenges occur in Frequency Containment Reserves (FCR) on power system because of decreasing system inertia from RES. LÄS MER