Search

Your search keyword '"Häger, Ulf"' showing total 87 results
Start Over Author "Häger, Ulf"
87 results on '"Häger, Ulf"'

4. List of Contributors

Author

Alhelou, Hassan Haes, primary, Almuraqab, Nasser A. Saif, additional, Andersson, Mats, additional, Basu, Aniket, additional, Bheemarasetti, Satyam, additional, Bhilwar, Anushka, additional, Billanes, Joy Dalmacio, additional, Buemi, Marco, additional, Burgholzer, Alexandra, additional, Domyshev, Alexander, additional, Dreglea, Aliona, additional, Ekren, Banu Yetkin, additional, El-Sherif, Doaa M., additional, Ercan, Tuncay, additional, Fahad, Abul Hasan, additional, Fakhimi, Amir Hoshang, additional, Foiadelli, Federica, additional, Foley, Aoife, additional, Gabbar, H., additional, Gaber, Hossam, additional, Getachew, Habtamu, additional, Gibbons, Ronald, additional, Gidey, Esayas, additional, Häger, Ulf, additional, Hernàndez, Carles Agustí, additional, Jørgensen, Bo Nørregaard, additional, Kanag, Dilara, additional, Khalil, Essam E., additional, Khan, Baseem, additional, Khani, Ali Hossein, additional, Küçükyaşar, Melis, additional, Kumar, Bipin Pradeep, additional, Kutay, Mahir, additional, Lazzeroni, P., additional, Lerher, Tone, additional, Longo, Michela, additional, Ma, Zheng, additional, Malhotra, Charru, additional, Manchanda, Vinti, additional, Mashima, Daisuke, additional, Mohanty, Ritu, additional, Othman, Ahmed M., additional, Pahuja, Neena, additional, Palmer, Matthew, additional, Panasetsky, Daniil, additional, Patruni, Ravi Prasad, additional, Peoples, Cathryn, additional, Pfeiffer, Andreas, additional, Repetto, M., additional, Sardroud, Javad Majrouhi, additional, Sidorov, Denis, additional, Sopasakis, Pantelis, additional, Tomin, Nikita, additional, and Yaici, Wahiba, additional

Published
2021
Full Text
View/download PDF

7. Interface Protection

Author

Bizumic, Lazar, Cherkaoui, Rachid, Häger, Ulf, Häger, Ulf, editor, Rehtanz, Christian, editor, and Voropai, Nikolai, editor

Published
2014
Full Text
View/download PDF

8. Wide Area Protection

Author

Rehtanz, Christian, Voropai, Nikolai, Häger, Ulf, Efimov, Dmitry, Panasetsky, Daniil, Domyshev, Alexander, Osak, Alexey, Häger, Ulf, editor, Rehtanz, Christian, editor, and Voropai, Nikolai, editor

Published
2014
Full Text
View/download PDF

11. Load Flow and Dynamic Model

Author

Seack, André, Schwippe, Johannes, Häger, Ulf, Panasetsky, Daniil, Häger, Ulf, editor, Rehtanz, Christian, editor, and Voropai, Nikolai, editor

Published
2014
Full Text
View/download PDF

13. Agent-Based Modelling of Cost Efficient and Stable Transmission Grid Expansion Planning

Author

Hiry, Johannes, von Haebler, Jonas, Häger, Ulf, Rehtanz, Christian, Blanco, Gerardo, Martinez, Aldo, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Liu, Ting, Series editor, Kotenko, Igor, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Bajo, Javier, editor, Escalona, María José, editor, Giroux, Sylvain, editor, Hoffa-Dąbrowska, Patrycja, editor, Julián, Vicente, editor, Novais, Paulo, editor, Sánchez-Pi, Nayat, editor, Unland, Rainer, editor, and Azambuja-Silveira, Ricardo, editor

Published
2016
Full Text
View/download PDF

18. Application of Self-Organizing Systems in Power Systems Control

Author

Müller, Sven C., Häger, Ulf, Rehtanz, Christian, Wedde, Horst F., Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Dieste, Oscar, editor, Jedlitschka, Andreas, editor, and Juristo, Natalia, editor

Published
2012
Full Text
View/download PDF

19. Experimental verification of smart grid control functions on international grids using a real-time simulator

Author

Palaniappan, Rajkumar, Molodchyk, Oleksii, Shariati-Sarcheshmeh, Mahdi, Asmah, Marilyn Winifred, Liu, Jiayan, Schlichtherle, Tobias, Richter, Frank, Kwofie, Ekow Appiah, Festner, Daniel Rios, Blanco, Gerardo, Mutule, Anna, Borscevskis, Olegs, Rafaat, Shady S., Li, Yong, Häger, Ulf, and Rehtanz, Christian

Subjects
Intelligentes Stromnetz, IEC-Norm, Elektrizitätsversorgungsnetz, Erneuerbare Energien, Dezentrale Energieversorgung, Internationaler Vergleich, Netzstabilität, Echtzeitsimulation
Abstract

The drastic increase in distributed energy resources (DERs) leads to challenges in the operation of distribution systems worldwide. While several solutions for grid monitoring and control are available on the market and in literature, this research is the first of its kind aiming to supervise the grid by providing a modular configurable unified hardware and software architecture. The control algorithms are configured using data models according to IEC 61850-7-3 and IEC 61850-7-4. The novel system architecture is a portable, modular and flexible architecture that aggregates smart grid control functions onto a standardised hardware platform, emphasising the need for hardware independence. The central controller contains several smart grid control functions and the various field devices are distributed across the distribution grid. This paper deals with the simulation of different real-world distribution grids on the Real-Time Simulator (RTS) and experimental verification of the control algorithms. Smart grid control functions such as Coordinated Voltage Control (CVC) and Optimal Power Flow (OPF) are experimentally verified on a German grid. The grid dynamics are compared when the central controller executes the CVC against the OPF implementations. The experimental results, advantages and challenges of each control are presented here. The results also showed the variation in grid behaviour when the control parameters were varied. The paper also shows that the algorithm and the choice of the control parameters depend upon the distribution grid's complexity and the system operator's individual needs. The results illustrate the potential of such a universal distribution automation solution for system operators worldwide., IET generation, transmission & distribution;16(13)

Published
2022

20. State Estimation and Determination of Flexibility Potential in Medium Voltage Networks

Author

Rewald Florian, Pohl Oliver, Häger Ulf, and Rehtanz Christian

Subjects
Physics, QC1-999
Abstract

This paper describes how flexibility of medium voltage systems can be used for operation of high voltage systems. This is explained using the example of a congestion management system for high voltage networks developed in the research project IDEAL. First, it is explained to what extent flexibility is required for high voltage system operation. After that, the entire congestion management system with flexibility of medium voltage systems is presented. Then, methodology for observability analysis, state estimation and determination of flexibility potential is shown. Finally, the implementation of the methodology in two real medium voltage systems is described.

Published
2019
Full Text
View/download PDF

21. Dynamic analysis of voltage angle droop controlled HVDC systems in curative congestion management scenarios

Author

Zhou Yang, Dalhues Stefan, and Häger Ulf

Subjects
Physics, QC1-999
Abstract

The integration of the voltage-source converter based high voltage direct current (VSC-HVDC) system makes the set-point of its active power adaptive to the changes in the power flow, and contributes to the curative congestion management. To further exploit the dynamic behavior of a hybrid AC/DC power system in curative congestion management scenarios, this paper investigates a novel control scheme for voltage angle droop controlled HVDC (VAD-HVDC) systems. The proposed scheme to alleviate the circuit overload is estimated firstly by calculating the severity index when the power flow changes under N-1 situations. Then the voltage angle controlled HVDC system is applied on the modified IEEE 39-bus 10-machine test power system for the time-domain simulation. The dynamic behavior in the HVDC station validates that the VAD control can stabilize the DC voltage and possess a good ability against interference. In addition, the dynamic characteristics analysis on the AC transmission lines proves that the hybrid AC/DC system integrated with the VAD controlled HVDC system are in possession of good stability after the N-1 contingency event. The VAD controller employed in the HVDC system is capable of effective congestion management to mitigate the critical loadings on the transmission lines.

Published
2019
Full Text
View/download PDF

22. Experimental verification of smart grid control functions on international grids using a real‐time simulator

Author

Palaniappan, Rajkumar, primary, Molodchyk, Oleksii, additional, Shariati‐Sarcheshmeh, Mahdi, additional, Asmah, Marilyn Winifred, additional, Liu, Jiayan, additional, Schlichtherle, Tobias, additional, Richter, Frank, additional, Kwofie, Ekow Appiah, additional, Festner, Daniel Rios, additional, Blanco, Gerardo, additional, Mutule, Anna, additional, Borscevskis, Olegs, additional, Rafaat, Shady S., additional, Li, Yong, additional, Häger, Ulf, additional, and Rehtanz, Christian, additional

Published
2022
Full Text
View/download PDF

23. InnoSys 2030 - Innovationen in der Systemführung bis 2030. Abschlussbericht

Author

Lukaschik, Andreas, Wasserrab, Andreas, Sacar, Ilhami, Abel, Matthias, Horn, Stefan, Askan, Halil, Merk, Peter, Falagan De La Sierra, Gonzalo, Heck, Cornelius, Grabarczyk, Oskar, Leeuwen, Tobias Van, Hoffrichter, André, Schneider, Thomas, Meinerzhagen, Ann-Kathrin, Mittelstaedt, Moritz, Shapovalov, Anton, Wick, Stephan, Geibel, Dominik, Nold, Bernhard, Kovacheska, Mihaela, Klesse, Lisa, Vielemeyer, Julian, Schottel, Bernd, Lässig, Marcus, Hollmach, Dirk, Lakenbrink, Christian, Schmidt, Thomas, Degner, Thomas, Mende, Denis, Strauß-Mincu, Diana, Pabón Ospina, Luis David, Wende-Von Berg, Sebastian, Marten, Frank Bernhard, Richter, Mario Stefan, Vogt, Mike, Ernst, Raphael, Henze, Martin, Serror, Martin, Zemanek, Sven, Kollenda, Katharina Marie, Schrief, Alexander, Sous, Tobias, Hacker, Immanuel, Samaan, Stefanie, Momeni, Mojtaba, Meißner, Fabian, Porada, Sirkka, Mehlmann, Gert, Raab, Alexander, Porst, Johannis, Schindler, Jakob, Biele, Charlotte, Lindner, Martin, Teodosic, Milijana, Häger, Ulf, Sennewald, Tom, Schlegel, Steffen, Hachenberger, Jan, Kemper, Jan, Dalhus, Stefan, Wiest, Pascal, Duckheim, Mathias, Kolster, Tim, and Ferdowsi, Mohsen

Published
2022
Full Text
View/download PDF

24. Operation strategies of battery energy storage systems for preventive and curative congestion management in transmission grids.

Author

Lindner, Martin, Peper, Jan, Offermann, Nils, Biele, Charlotte, Teodosic, Milijana, Pohl, Oliver, Menne, Julian, and Häger, Ulf

Subjects
BATTERY storage plants, ENERGY storage, CARRIER transmission on electric lines, GRID energy storage, INDEPENDENT system operators, ELECTRIC lines, ELECTRICAL load, ELECTRIC batteries
Abstract

Anticipating and relieving congestions is an ongoing challenge for transmission system operators. Distributed grid‐scale battery energy storage systems enable operators to shift power flows and remedy congestion through virtual power lines and grid boosters. This paper includes battery energy storage systems in a combined preventive and curative congestion management optimization. First, it analyzes the impact of the two operational strategies in a case study of the German transmission grid. Furthermore, it outlines curative ad‐hoc measures to overcome uncertainties during operational planning and real‐time operation. The simulation results indicate that battery energy storage systems further increase the use of curative measures and reduce congestion management costs. [ABSTRACT FROM AUTHOR]

Published
2023
Full Text
View/download PDF

33. Wide Area Protection

Author

Rehtanz, Christian, primary, Voropai, Nikolai, additional, Häger, Ulf, additional, Efimov, Dmitry, additional, Panasetsky, Daniil, additional, Domyshev, Alexander, additional, and Osak, Alexey, additional

Published
2014
Full Text
View/download PDF

38. State Estimation and Determination of Flexibility Potential in Medium Voltage Networks.

Author

Rehtanz, C., Voropai, N., Rewald, Florian, Pohl, Oliver, Häger, Ulf, and Rehtanz, Christian

Subjects
STATE estimation in electric power systems, OBSERVABILITY (Control theory), HIGH voltages, GREENHOUSE gas mitigation, COAL-fired power plants
Abstract

This paper describes how flexibility of medium voltage systems can be used for operation of high voltage systems. This is explained using the example of a congestion management system for high voltage networks developed in the research project IDEAL. First, it is explained to what extent flexibility is required for high voltage system operation. After that, the entire congestion management system with flexibility of medium voltage systems is presented. Then, methodology for observability analysis, state estimation and determination of flexibility potential is shown. Finally, the implementation of the methodology in two real medium voltage systems is described. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

39. Dynamic analysis of voltage angle droop controlled HVDC systems in curative congestion management scenarios.

Author

Rehtanz, C., Voropai, N., Zhou, Yang, Dalhues, Stefan, and Häger, Ulf

Subjects
HIGH-voltage direct current converters, ELECTRIC power systems, ELECTRIC lines, ELECTRIC circuits, SIMULATION methods & models
Abstract

The integration of the voltage-source converter based high voltage direct current (VSC-HVDC) system makes the set-point of its active power adaptive to the changes in the power flow, and contributes to the curative congestion management. To further exploit the dynamic behavior of a hybrid AC/DC power system in curative congestion management scenarios, this paper investigates a novel control scheme for voltage angle droop controlled HVDC (VAD-HVDC) systems. The proposed scheme to alleviate the circuit overload is estimated firstly by calculating the severity index when the power flow changes under N-1 situations. Then the voltage angle controlled HVDC system is applied on the modified IEEE 39-bus 10-machine test power system for the time-domain simulation. The dynamic behavior in the HVDC station validates that the VAD control can stabilize the DC voltage and possess a good ability against interference. In addition, the dynamic characteristics analysis on the AC transmission lines proves that the hybrid AC/DC system integrated with the VAD controlled HVDC system are in possession of good stability after the N-1 contingency event. The VAD controller employed in the HVDC system is capable of effective congestion management to mitigate the critical loadings on the transmission lines. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

43. Coordinated Intelligent Operation and Emergency Control of Electric Power Systems

Author

Voropai, Nicolay, primary, Kolosok, Irina, additional, Korkina, Elena, additional, Paltsev, Alexey, additional, Glazunova, Anna, additional, Kurbatsky, Victor, additional, Tomin, Nikita, additional, Gamm, Alexander, additional, Golub, Irina, additional, Bershansky, Roman, additional, Panasetsky, Daniil, additional, Efimov, Dmitry, additional, Popov, Dmitry, additional, Rehtanz, Christian, additional, and Häger, Ulf, additional

Full Text
View/download PDF

45. Technologies for the Control of Interconnected Power Systems.

Author

L'Abbate, Angelo and Häger, Ulf

Abstract

Since the early stages of development of interconnected electric power systems throughout the world, the issue of how to best perform network control functions has been faced by the respective system operators. The key parameters that need to be continuously handled and controlled by operators in order to keep their HVAC (High Voltage Alternating Current) system security at both steady-state and dynamic level include: line current magnitude, nodal voltage amplitude, nodal voltage angular difference, active power flow, reactive power flow, system frequency. [ABSTRACT FROM AUTHOR]

Published
2014
Full Text
View/download PDF

47. Ch.17 - Interface Protection

Author

Bizumic, Lazar, Cherkaoui, Rachid, and Häger, Ulf

Abstract

A coupling of the electrical networks of ENTSO-E and IPS/UPS would result in a power system unprecedented in size and complexity, and potentially could have severe effects on operation and stability.

Catalog

Books, media, physical & digital resources
See catalog results