Blar i NTNU Open på forfatter "Endegnanew, Atsede Gualu"
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Avoiding AC/DC grid interaction in MMC based MTDC Systems
Endegnanew, Atsede Gualu; Bergna-Diaz, Gilbert; Uhlen, Kjetil (Chapter, 2017)In this paper, the interaction between ac and dc grids is studied for two types of MMC control structures; conventional and non-conventional control structures. Linear analysis methods that are based mode shapes and ... -
Distributed generation in future distribution systems: Dynamic aspects
Endegnanew, Atsede Gualu (Master thesis, 2010)The objective of this thesis work was to study the stability of a distribution network with several distributed generators (DGs) considering different types of regulators in the DGs and loading conditions. The distribution ... -
Enhanced primary frequency control from EVs: a fleet management strategy to mitigate effects of response discreteness
Zecchino, Antonio; D'Arco, Salvatore; Endegnanew, Atsede Gualu; Korpås, Magnus; Marinelli, Mattia (Journal article; Peer reviewed, 2019)Electric vehicle (EV) chargers can be controlled to support the grid frequency by implementing a standard-compliant fast primary frequency control (PFC). This study addresses potential effects on power systems due to control ... -
Experimental Verification of a Voltage Droop Control for Grid Integration of Offshore Wind Farms Using Multi-terminal HVDC
Torres Olguin, Raymundo E.; Årdal, Atle Rygg; Støylen, Hanne; Endegnanew, Atsede Gualu; Ljøkelsøy, Kjell; Tande, John Olav Giæver (Journal article; Peer reviewed, 2014)This paper presents an experimental verification of a voltage droop control for a multi-terminal HVDC system for the grid integration of offshore wind farms. The laboratory setup is composed by four voltage-source converter ... -
Integrated Modelling Platform for Dynamic Performance Assessment of Floating Wind Turbines
Endegnanew, Atsede Gualu; Satertro, Kristian; Gjerde, Sverre Skalleberg; Svendsen, Harald Georg; Anaya-Lara, Olimpo; Tande, John Olav Giæver; Uhlen, Kjetil; Gjolmesli, Svein (Peer reviewed; Journal article, 2015)The paper presents an integrated modelling platform that can be used to assess the dynamic performance of an offshore wind turbine mounted on a spar-buoy type floater. Sub-models of generator and converter controllers and ... -
Operation and Control of hybrid AC/DC transmission grids
Uhlen, Kjetil; Endegnanew, Atsede Gualu; Haileselassie, Temesgen Mulugeta (Chapter, 2019)This paper describes challenges and possibilities related to operation and control of hybrid AC/DC power transmission grids. The aim is to discuss topics that transmission system operators and regulators must assess in ... -
Power oscillation damping with virtual capacitance support from modular multilevel converters
Taffese, Abel Assegid; Endegnanew, Atsede Gualu; D'Arco, Salvatore; Tedeschi, Elisabetta (Journal article; Peer reviewed, 2019)Power oscillation damping (POD) is one of the ancillary services expected from high-voltage direct current (HVDC) converters. When providing POD to the ac side, converters draw power from the dc side, which can cause ... -
Stability Analysis of High Voltage Hybrid AC/DC Power Systems
Endegnanew, Atsede Gualu (Doktoravhandlinger ved NTNU;2017:256, Doctoral thesis, 2017)Interest in large-scale integration of power from renewable energy sources (RES) has grown in the last decade as a result of energy policies adopted by governments in an effort to reduce CO2 and greenhouse gas emissions. ... -
Using Decentralized Control Techniques for Interaction Analysis in Hybrid AC/DC Grids
Endegnanew, Atsede Gualu; Kalemba, Lester; Uhlen, Kjetil (Chapter, 2018)One of the ancillary services that can be provided by Multi-terminal Direct Current (MTDC) grid to connected ac grids is power oscillation damping (POD). However, using PODs at multiple terminals of an MTDC grid results ...