Sökning: "Islanded operation"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden Islanded operation.

  1. 1. Resynchronisation of Islanded Power Systems

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

    Författare :Emelie Frost; [2020]
    Nyckelord :;

    Sammanfattning : The electricity demand and need of renewably produced electricity has increased the interest in locally produced electricity, also called distributed generation. The increase of distributed generation increases the risk of islanding, a state when a part of the grid has been electrically isolated. LÄS MER

  3. 2. Operation of battery energy storage system for frequency control of hydropower operated in island mode

    Uppsats för yrkesexamina på avancerad nivå, Mälardalens högskola/Akademin för ekonomi, samhälle och teknik

    Författare :Amanda Hallblad; [2020]
    Nyckelord :Battery energy storage system BESS ; hydropower; microgrid MG ; operational strategies; frequency control; PowerFactory;

    Sammanfattning : The purpose of this study is to analyse how a battery energy storage system (BESS) can support the frequency and voltage stability for an islanded microgrid containing a hydropower plant. Two different microgrids, both situated in Sweden, are evaluated. Modelling and dynamic simulations are conducted in the PowerFactory tool. LÄS MER

  4. 3. LCA of Microgrid System: a Case Study at ‘North-five Islands’ of Changshan Archipelago, China

    Master-uppsats, KTH/Skolan för industriell teknik och management (ITM)

    Författare :Jiang Yuning; [2019]
    Nyckelord :Microgrid system; Life cycle Assessment LCA ; Climate change impact; Greenhouse gas emissions GHG ; China;

    Sammanfattning : Microgrid can provide stable, clean, and sustainable electricity supply for remote places since it can operate on renewable energy sources and work isolated from the utility grid. This thesis evaluates the life cycle greenhouse gas (GHG) emissions of the microgrid system which is located at the ‘North-five Islands’ of Changshan archipelago in China. LÄS MER

  5. 4. Microgrid Safety and Protection Strategies

    Master-uppsats, KTH/Elektroteknisk teori och konstruktion

    Författare :Aryudha Hartono; [2018]
    Nyckelord :IB-RES; grid-connected mode; islanded mode; short circuit; IED; directional zero and negative sequence current protection; unbalanced load flow; protection coordination; fault ride-through;

    Sammanfattning : One of the challenging issues with the Microgrid is that the bidirectional power flow providedby the distributed generator (DG) which modify the fault current level. Furthermore, theinverter based-renewable energy source (IB-RES) limits the total fault current contributionto the grid due to its thermal capability. LÄS MER

  7. 5. Rapid Prototyping of Microgrid Controllers for Autonomous and Grid-Connected Operation

    Kandidat-uppsats, KTH/Hållbar utveckling, miljövetenskap och teknik

    Författare :Joel Henriksson Larsson; Martin Becedas Dahl; [2018]
    Nyckelord :microgrid; controller; raspberry pi; power systems;

    Sammanfattning : Detta projekt har haft målet att designa en regulator som ska hålla en viss frekvens och spänning i ett microgrid under olika steg. Dessa var att koppla bort microgridet från huvudnätet, justera fasvinkeln så att den överensstämmer med huvudnätets och till sist återansluta näten. Fyra olika scenarier genomfördes. LÄS MER