Blar i Publikasjoner fra CRIStin - SINTEF Energi på forfatter "Degefa, Merkebu Zenebe"

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    • Analysis of Future Loading Scenarios in a Norwegian LV Network 

      Degefa, Merkebu Zenebe; Sæle, Hanne; Andresen, Christian Andre (Chapter; Peer reviewed, 2019)
      This paper identifies the effect of Electric vehicles (EVs) and solar panels/photovoltaic (PVs) on the distribution grid with and without the use of demand response. A method to generate realistic profiles of EVs and PVs ...

    • Application of a Testing Chain Methodology for Improving Power Converter Controllers 

      Degefa, Merkebu Zenebe; Taxt, Henning; Pellegrini, Luigi; Merino, Julia; Jimenez, Adrian; Narayan, Anand; Gavriluta, Catalin; Strasser, Thomas I. (Chapter; Peer reviewed, 2020)
      The practice of testing power system equipment like converters usually involves simulation, laboratory and field testing in that sequence. Such an approach lacks smooth transition and wide coverage of new services which ...

    • Assessment of flexibility in different ancillary services for the power system 

      Sæle, Hanne; Morch, Andrei Z; Degefa, Merkebu Zenebe; Oleinikova, Irina (International Conference on the European Energy Market;2020, Chapter; Peer reviewed, 2020)
      To handle the changing power system and enable the energy transformation, several actions are needed, where the increase of digitalization, automation and more substantial production variability implies a need for flexibility. ...

    • Challenges of TSO-DSO Voltage Regulation Under Real-Time Data Exchange Paradigm 

      Degefa, Merkebu Zenebe; Lundkvist, Henrik; Sanchez Acevedo, Santiago; Gregertsen, Kristoffer Nyborg (Peer reviewed; Journal article, 2023)
      As conventional power generation units are being replaced with distributed energy resources, operational practices such as voltage regulation and congestion management are expected to be challenging. To address these ...

    • Characterization of flexibility resources and distribution networks 

      Le Baut, Julien; Leclerq, Guillaume; Vigano, Giacomo; Degefa, Merkebu Zenebe (Research report, 2017)

    • Comprehensive classifications and characterizations of power system flexibility resources 

      Degefa, Merkebu Zenebe; Sperstad, Iver Bakken; Sæle, Hanne (Peer reviewed; Journal article, 2021)
      Due to the increasing integration of renewable forms of generation, ageing network infrastructure, and rapid increase in peak load demand, flexibility is becoming economically more viable and hence significant role player ...

    • Data-driven Household Load Flexibility Modelling: Shiftable Atomic Load 

      Degefa, Merkebu Zenebe; Sæle, Hanne; Petersen, Idar; Ahcin, Peter (Chapter; Peer reviewed, 2018)
      To keep a stable power system, there should always be balance between the generation and consumption of electricity. In this study, a flexibility modelling method for atomic loads which is based on high resolution appliance ...

    • Demand flexibility modelling for long term optimal distribution grid planning 

      Bødal, Espen Flo; Lakshmanan, Venkatachalam; Sperstad, Iver Bakken; Degefa, Merkebu Zenebe; Hanot, Maxime; Ergun, Hakan; Rossi, Marco (Peer reviewed; Journal article, 2022)
      Optimisation tools for long-term grid planning considering flexibility resources require aggregated flexibility models that are not too computationally demanding or complex. Still, they should capture the operational ...

    • Design of experiments aided holistic testing of cyber-physical energy systems 

      van der Meer, Arjen A.; Steinbrink, Cornelius; Heussen, Kai; Bondy, Daniel E. Morales; Degefa, Merkebu Zenebe; Andrén, Filip Pröstl; Strasser, Thomas I.; Lehnhoff, Sebastian; Palensky, Peter (Chapter; Peer reviewed, 2018)
      The complex and often safety-critical nature of cyber-physical energy systems makes validation a key challenge in facilitating the energy transition, especially when it comes to the testing on system level. Reliable and ...

    • A distributed algorithm for controlling continuous and discrete variables in a radial distribution grid 

      Klemets, Jonatan Ralf Axel; Degefa, Merkebu Zenebe (Peer reviewed; Journal article, 2023)
      The increased integration of distributed energy resources (DERs) in the distribution network with intermitent generation profiles will likely make voltage regulation a difficult task. However, DERs bring both challenges ...

    • Electric water heater flexibility potential and activation impact in system operator perspective – Norwegian scenario case study 

      Lakshmanan, Venkatachalam; Sæle, Hanne; Degefa, Merkebu Zenebe (Peer reviewed; Journal article, 2021)
      Simultaneous activation of demand side flexibility on thermostatically controlled loads will cause adverse impacts later in the form of rebounds. Distribution system operators must know the characterisation of the impact, ...

    • ERIGrid Holistic Test Description for Validating Cyber-Physical Energy Systems 

      Heussen, Kai; Steinbrink, Cornelius; Abdulhadi, I.F.; Nguyen, V.H.; Degefa, Merkebu Zenebe; Merino, Julia; Jensen, T.V.; Guo, H.; Gehrke, Oliver; Bondy, Daniel E. Morales; Babazadeh, D.; Pröstl Andrén, F.; Strasser, Thomas I. (Journal article; Peer reviewed, 2019)
      Smart energy solutions aim to modify and optimise the operation of existing energy infrastructure. Such cyber-physical technology must be mature before deployment to the actual infrastructure, and competitive solutions ...

    • Exploring household's flexibility of smart shifting atomic loads to improve power grid operation and cost efficiency 

      Fjelldal, Bjørnar; Fodstad, Marte; Rosenlund, Gjert Hovland; Sæle, Hanne; Degefa, Merkebu Zenebe (International Conference on the European Energy Market;2020, Chapter; Peer reviewed, 2020)
      This paper explores the possibilities of shifting certain household consumer-based loads in time, to reduce unnecessary load peaks to the grid which again can cause challenges for Distribution System Operators (DSOs). ...

    • Flexibility offered to the distribution grid from households with a photovoltaic panel on their roof: Results and experiences from several pilots in a Norwegian research project 

      Bremdal, Bernt Arild; Sæle, Hanne; Mathisen, Geir; Degefa, Merkebu Zenebe (Chapter; Peer reviewed, 2018)
      The objective of this study is to evaluate how PV-oriented prosumers can offer flexibility to the Distribution System Operator (DSO). The different cases focus on the customer and changes on the customer side that will ...

    • FlexOps DP1 Testcase 

      Sæle, Hanne; Sandell, Susanne; Istad, Maren Kristine; Degefa, Merkebu Zenebe (SINTEF Rapport;, Research report, 2023)
      Denne rapporten er utarbeidet i prosjektet FlexOps – Støttesystem for fleksibilitet til bruk i nettdrift. Prosjektet er et Pilot-E-prosjekt med prosjektpartnere: Kongsberg Digital, Tensio, Elvia, Mørenett, Pixii, ...

    • From Scenarios to Use Cases, Test Cases and Validation Examples 

      Maki, K.; Kulmala, A.; Heussen, K.; Gehrke, O.; Rikos, E.; Merino, J.; Rossi, M.; Pellegrino, L.; Sandroni, C.; Degefa, Merkebu Zenebe; Taxt, Henning; Lagos, D.; Kotsampopoulos, P. (Chapter, 2020)
      Selected validation scenarios and corresponding test cases in the context of the ERIGrid project are presented in this chapter. Furthermore, the benefits of using the ERIGrid validation method and testing tools are discussed ...

    • The impact of flexible resources in distribution systems on the security of electricity supply: A literature review 

      Sperstad, Iver Bakken; Degefa, Merkebu Zenebe; Kjølle, Gerd Hovin (Peer reviewed; Journal article, 2020)
      The power system is transitioning from the traditional one-way system to a more integrated and complex system with more active end-users and with generation and reverse power flow at the distribution level. As a part of ...

    • Improving smart grid security through 5G enabled IoT and edge computing 

      Borgaonkar, Ravishankar Bhaskarrao; Tøndel, Inger Anne; Degefa, Merkebu Zenebe; JAATUN, Martin Gilje (Peer reviewed; Journal article, 2021)
      This article investigates and analyzes the security aspects of 5G specifications from the perspective of IoT-based smart grids. As the smart grid requires high-speed and reliable communication to enable real-time grid ...

    • Interconnection Protocols for Minigrids 

      Perumalla, Chandrasekhar; Taxt, Henning; Degefa, Merkebu Zenebe (Research report, 2021)

    • Modelling and Simulation Approaches for Local Energy Community Integrated Distribution Networks 

      Rana, Rubi; Berg, Kjersti; Degefa, Merkebu Zenebe; Löschenbrand, Markus (Peer reviewed; Journal article, 2022)
      Due to the absence of studies of local energy communities (LECs) where the grid is represented, it is very difficult to infer implications of increased LEC integration for the distribution grid as well as for the wider ...