Hjörtur Jóhannsson

Hjörtur Jóhannsson

Senior Scientific Consultant

DTU ELECTRICAL ENGINEERING
Department of Electrical Engineering

Technical University of Denmark

Elektrovej

Building 325, room 162

2800 Kgs. Lyngby

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2019
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A Memory-Efficient Parallelizable Method for Computation of Thévenin Equivalents used in Real-Time Stability Assessment

Jørgensen, Christina Hildebrandt Lüthje ; Møller, Jakob Glarbo ; Sommer, Stefan ; Jóhannsson, Hjörtur
in: I E E E Transactions on Power Systems, vol: 34, issue: 4, pages: 2675-2684

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2019     |    DOI: https://doi.org/10.1109/TPWRS.2019.2900560

2018
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Evaluation of Factorization Methods for Thévenin Equivalent Computations in Real-Time Stability Assessment

Hildebrandt, Christina ; Karatas, Bahtiyar Can ; Glarbo Muller, Jakob ; Johannsson, Hjortur
part of: Proceedings of 2018 Power Systems Computation Conference, pages: 7 pp., 2018, IEEE
Presented at:
20th Power Systems Computation Conference

Type: Article in proceedings (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.23919/PSCC.2018.8442893

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Improved Voltage Stability Boundary Monitoring by Accounting for Variations in Thevenin Voltage Magnitude.

Karatas, Bahtiyar Can ; Jóhannsson, Hjörtur ; Nielsen, Arne Hejde
part of: Proceedings of 8th IEEE PES Innovative Smart Grid Technologies Conference, 2018, IEEE
Presented at:
8th IEEE PES Innovative Smart Grid Technologies Conference

Type: Article in proceedings (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1109/ISGTEurope.2018.8571648

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Real-Time Early Warning and Early Prevention System to Avoid System Blackouts

Jóhannsson, Hjörtur
part of: Procedings of the 2018 IEEE PES General Meeting, 2018, IEEE
Presented at:
2018 IEEE PES General Meeting

Type: Article in proceedings (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1109/PESGM.2018.8585534

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Reduce-Factor-Solve for Fast Thevenin Impedance Computation and Network

Sommer, Stefan ; Aabrandt, Andreas ; Jóhannsson, Hjörtur
in: I E T Generation, Transmission and Distribution, vol: 13, issue: 2, pages: 288-295

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1049/iet-gtd.2018.5330

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Super-Positioning of Voltage Sources for Fast Assessment of Wide-Area Thévenin Equivalents

Møller, Jakob Glarbo ; Jóhannsson, Hjörtur ; Østergaard, Jacob
part of: Proceedings of the 2018 IEEE PES General Meeting, 2018, IEEE
Presented at:
2018 IEEE PES General Meeting

Type: Article in proceedings (Peer reviewed)

Status: Published     |    Year: 2018     |    DOI: https://doi.org/10.1109/PESGM.2018.8585962

2017
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An Improved On-line Contingency Screening for Power System Transient Stability Assessment

Weckesser, Johannes Tilman Gabriel ; Jóhannsson, Hjörtur ; Glavic, Mevludin ; Østergaard, Jacob
in: Electric Power Components and Systems, vol: 45, issue: 8, pages: 852-863

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2017     |    DOI: https://doi.org/10.1080/15325008.2017.1310953

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Considering wind speed variability in real-time voltage stability assessment using Thévenin equivalent methods

Perez, Angel ; Karatas, Bahtiyar Can ; Jóhannsson, Hjörtur ; Østergaard, Jacob
part of: Proceedings of 2017 IEEE Manchester PowerTech, 2018, IEEE
Presented at:
12th IEEE Power and Energy Society PowerTech Conference

Type: Article in proceedings (Peer reviewed)

Status: Published     |    Year: 2017     |    DOI: https://doi.org/10.1109/PTC.2017.7980951

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Detecting Topological Errors with Pre-Estimation Filtering of Bad Data in Wide-Area Measurements

Møller, Jakob Glarbo ; Sørensen, Mads ; Jóhannsson, Hjörtur ; Østergaard, Jacob
part of: Proceedings of 12th IEEE Power and Energy Society PowerTech Conference, 2018, IEEE
Presented at:
12th IEEE Power and Energy Society PowerTech Conference

Type: Article in proceedings (Peer reviewed)

Status: Published     |    Year: 2017     |    DOI: https://doi.org/10.1109/PTC.2017.7980940

  PDF

Super-Positioning of Voltage Sources for Fast Assessment of Wide-Area Thévenin Equivalents

Møller, Jakob Glarbo ; Jóhannsson, Hjörtur ; Østergaard, Jacob
in: I E E E Transactions on Smart Grid, vol: 8, issue: 3, pages: 1488-1493

Type: Journal article (Peer reviewed)

Status: Published     |    Year: 2017     |    DOI: https://doi.org/10.1109/TSG.2016.2639559