Prof. Dr.-Ing. habil. Lutz Hofmann

Prof. Dr.-Ing. habil. Lutz Hofmann
Prof. Dr.-Ing. habil. Lutz Hofmann
Positions
Executive Director
Institute of Electric Power Systems
Executive Director
Electric Power Engineering Section
Head of Examining Board
Examination Board Electrical Engineering
Deputy Chair
Admissions Board, Power Engineering
Executive Board
Institute of Electric Power Systems
Representatives for professors
Curriculum and Teaching Committee, Electrical Engineering
Professors
Electric Power Engineering Section

RESEARCH FOCUSES

  • Simulation of the stationary and non-stationary operating behaviour of electrical energy systems and development of strategies for the efficient simulation of non-stationary operating behaviour (time-scale modelling)
  • Optimization of the operational management and planning of electrical energy systems
  • Use of new system components in the electrical power supply
  • Analysis of the operating states of the electrical energy system, network resonances and network perturbation

CURRICULUM VITAE

  • 1988 till 1994 studies of Electrical Engineering at the University of Hanover
  • 1995 Academic Reward from the VDE Bezirksvereins Hannovers  
  • 1994 till 1998 research assistant in the Divsion of Power Supply at the University of Hanover 
  • 1997 PhD to Dr.-Ing. at the University of Hanover. Dissertation: Modeling of Overhead Wires with Frequent-dependent Parameters in Short-term Range. Düsseldorf: VDI-Verlag, Reihe 21, Nr. 243, 1998. 
  • 1998 till 2002 research assistant (Deutsche Forschungsgemeinschaft, German Research Foundation) in the Devision of Power Supply at the University of Hanover.
  • 2003 Habilitation at the University of Hanover, licence to teach (venia legendi) in the Division of Power Supply. Habilitation dissertation: Efficient Calculation of Equalization Processes in Large-scale Electric Power Systems. Aachen: Shaker Verlag, 2003. 
  • 2002 till 2003 occupation in the industry as project manager for Studies of Electrical Engineering with Fichtner GmbH & Co. KG, Stuttgart 
  • 2004-2007 occupation in the industry as Network Planning Engineer  with E.ON Netz GmbH, Bayreuth 
  • 2007 call for the Professorship for Power Supply at the University of Hanover

  • Chairman and German representative in TC 73 Short Circuit Currents of the IEC
  • Member of K121 Kurzschlussströme (Short-circuit currents) and UK121.1 Berechnung von Kurzschlussströmen (Calculation of short-circuit currents) of the DKE

BOOKS

Hofmann, Lutz: Elektrische Energieversorgung Band 1: Grundlagen, Systemaufbau und Methoden. Berlin, De Gruyter Oldenbourg, 2019, DOI: 10.1515/9783110548532

Hofmann, Lutz: Elektrische Energieversorgung Band 2: Betriebsmittel und ihre quasistationäre Modellierung. Berlin, De Gruyter Oldenbourg, 2019, DOI: 10.1515/9783110548600

Hofmann, Lutz: Elektrische Energieversorgung Band 3: Systemverhalten und Berechnung von Drehstromsystemen. Berlin, De Gruyter Oldenbourg, 2019, DOI: 10.1515/9783110608274

  • Publications

    2021


    Gerster, J., Sarstedt, M., Veith, E., Lehnhoff, S., & Hofmann, L. (2021). Pointing out the Convolution Problem of Stochastic Aggregation Methods for the Determination of Flexibility Potentials at Vertical System Interconnections. 1-7. Paper presented at The Eleventh International Conference on Smart Grids, Green Communications and IT Energy-aware Technologies - ENERGY 2021, Valencia, Spain. www.thinkmind.org/index.php

    Huisinga, H., & Hofmann, L. (2021). Strukturanalyse des mit dem Erweiterten Knotenpunktverfahren formulierten Differential-algebraischen Gleichungssystems. At-Automatisierungstechnik, 69(5), 353-363. doi.org/10.1515/auto-2021-0001

    Kluß, L., Leveringhaus, T., Sarstedt, M., & Hofmann, L. (Accepted/In press). Inclusion of Network Configurations in a Security Constrained Optimal Power Flow as a Mixed-Integer Quadratically Constrained Quadratic Program. Paper presented at NEIS 2021 , Hamburg, Germany.

    Lotz, M. R., Majumdar, N., Beutel, V., Gerlach, J., Wegkamp, C., Hoffmann, M., Kahl, L., Wussow, J., Schlachter, H., Agert, C., Breitner, M. H., Engel, B., Geissendörfer, S., Hofmann, L., Könemund, M., Kurrat, M., Leveringhaus, T., & Maydell, K. V. (2021). Potentials and Technical Requirements for the Provision of Ancillary Services in Future Power Systems with Distributed Energy Resources. 1-8.

    Majumdar, N., Sarstedt, M., Leveringhaus, T., & Hofmann, L. (Accepted/In press). Linearized Optimization for Reactive Power Dispatch at Transmission Grid Level considering Discrete Transformer Tap-Settings. In 13th IEEE PES Asia-Pacific Power and Energy Engineering Conference 2021 (APPEEC) (pp. 1-6)

    Neufeld, A., Schütte, N., & Hofmann, L. (2021). Anwendung und Erweiterung der Zuweisung von Oberschwingungsstrompegeln für die Netzanschlussnehmer gemäß VDE AR-N 4130. In ETG-Kongress 2021 - Von Komponenten bis zum Gesamtsystem für die Energiewende (ETG-Kongress 2021)

    Sarstedt, M., Leveringhaus, T., Kluß, L., & Hofmann, L. (2021). Comparison of Convexificated SQCQP and PSO for the Optimal Transmission System Operation based on Incremental In-Phase and Quadrature Voltage Controlled Transformers. 1. Paper presented at NEIS 2021 , Hamburg, Germany.

    Sarstedt, M., Kluß, L., Gerster, J., Meldau, T., & Hofmann, L. (2021). Survey and Comparison of Optimization-Based Aggregation Methods for the Determination of the Flexibility Potentials at Vertical System Interconnections. ENERGIES, 14(3), [687]. doi.org/10.3390/en14030687

    Schäkel, N., & Hofmann, L. (2021). Exakte und genäherte Kurzschlussstromberechnung in Netzen mit Vollumrichteranlagen. At-Automatisierungstechnik, 69(5), 389-400. doi.org/10.1515/auto-2021-0036

    Schütte, N., Neufeld, A., Hofmann, L., Dommerque, R., & Nazemi, M. (2021). Harmonic Emission Limit Allocation Using VDE AR-N 4130: Application and Adaptation of Experiences from IEC TR 61000-3-6. In 2021 56th International Universities Power Engineering Conference, UPEC 2021 - Proceedings doi.org/10.1109/UPEC50034.2021.9548275

    Thiele, J., Wiehe, J., Gauglitz, P., Pape, C., Lohr, C., Bensmann, A. L., Hanke-Rauschenbach, R., Kluß, L., Hofmann, L., Kraschewski, T., Breitner, M. H., Demuth, B., Vayhinger, E., Heiland, S., & von Haaren, C. (2021). Konkretisierung von Ansatzpunkten einer naturverträglichen Ausgestaltung der Energiewende, mit Blick auf strategische Stellschrauben: Naturverträgliche Ausgestaltung der Energiewende. Schriftenreihe des Bundesamtes für Naturschutz, Naturschutz und biologische Vielfalt. doi.org/10.19217/skr614

    Wussow, J., Kahl, L., Lotz, M. R., Hoffmann, M., Beutel, V., Buchholz, S., Gerlach, J., Majumdar, N., Narayan, A., Scheunert, A., Baboli, P. T., Tiemann, P. H., Werth, O., Geissendörfer, S., Leveringhaus, T., Maydell, K. V., Engel, B., Kurrat, M., Agert, C., ... Huxoll, N. (2021). SiNED-Ancillary Services for Reliable Power Grids in Times of Progressive German Energiewende and Digital Transformation. In ETG-Kongress 2021 - Von Komponenten bis zum Gesamtsystem für die Energiewende (ETG-Kongress 2021)


    2020


    Herrmann, M., & Hofmann, L. (2020). Ensuring Short-term Voltage Stability in Extensive Grids With High Power Electronic Penetration by Applying Grid Forming Controls. Paper presented at International Conference on Smart Grids and Energy Systems, Perth, Western Australia, Australia.

    Hofmann, L. (2020). Unified fault matrix method for the calculation of shunt and series faults in power systems with complete duality of shunt and series fault matrices. Electric power systems research, 189, [106556]. doi.org/10.1016/j.epsr.2020.106556

    Huisinga, H. H., & Hofmann, L. (2020). Consistent solution for electric power system simulations with inconsistent initial values. In Proceedings - 2020 IEEE International Conference on Environment and Electrical Engineering and 2020 IEEE Industrial and Commercial Power Systems Europe, EEEIC / I and CPS Europe 2020 IEEE Computer Society Press. doi.org/10.1109/EEEIC/ICPSEurope49358.2020.9160814

    Leveringhaus, T., & Hofmann, L. (2020). Detailed reasoning and derivation of a convexificated quadratic approximation approach for the Security Constrained Optimal Power Flow. In Proceedings - 2020 International Conference on Smart Grids and Energy Systems, SGES 2020 (pp. 261-266). [9364447] IEEE Computer Society. doi.org/10.1109/sges51519.2020.00053

    Mende, D., Harms, Y., Härtel, P., Frischmuth, F., Stock, S., Braun, M., Herrmann, M., Hofmann, L., Valois, M., Bley, A., Hahn, P., Jurczyk, J., & Rathke, C. (2020). NSON II: Next Steps in Economical Connection and International Integration of Offshore Wind Energy in the North Seas. Paper presented at 19th Wind Integration Workshop.

    Mende, D., Stock, D. S., & Hofmann, L. (2020). Superposition-based Modelling of Series FACTS in Nonlinear Mathematical Optimized Grid Operation. In 2020 IEEE PES Innovative Smart Grid Technologies Europe: Smart Grids: key enabler of a green power system (pp. 359-363). [9248819] IEEE. doi.org/10.1109/isgt-europe47291.2020.9248819

    Neufeld, A., Alkemper, M. J., Schäkel, N., & Hofmann, L. (2020). On the Influence of Time Delay Modelling in Grid-Connected Converters for Harmonic Studies. In 2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2020 (pp. 46-50) doi.org/10.1109/pedg48541.2020.9244443

    Sarstedt, M., Majumdar, N., Blaufuß, C. J., & Hofmann, L. (2020). Multi-Voltage-Level Electric Power System Data Sets. doi.org/10.25835/0013459

    Sarstedt, M., Kluß, L., Dokus, M., Gerster, J., & Hofmann, L. (2020). Simulation of Hierarchical Multi-Level Grid Control Strategies. In Proceedings 2020 International Conference on Smart Grids and Energy Systems (SGES 2020) (pp. 175-180). [9364631] IEEE Computer Society. doi.org/10.1109/SGES51519.2020.00038

    Schäkel, N., Neufeld, A., & Hofmann, L. (2020). Hybrid PLL Structure for Improvement of the Dynamic Performance of Grid-Connected Converters. In D. Schulz (Ed.), NEIS 2020; Conference on Sustainable Energy Supply and Energy Storage Systems (pp. 93-98)

    Schäkel, N., Neufeld, A., & Hofmann, L. (2020). On the Direct Voltage Control Concept of Grid Connected Power Converters. In 2020 IEEE 11th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2020 (pp. 143-148) doi.org/10.1109/pedg48541.2020.9244437

    Stock, D. S., Harms, Y., Mende, D., & Hofmann, L. (2020). Robust nonlinear mathematical transmission expansion planning based on German electricity market simulation. Electric power systems research, 189, [106685]. doi.org/10.1016/j.epsr.2020.106685


    2019


    Blaufuss, C., & Hofmann, L. (2019). Linear Optimization of Reinforcements in Medium Voltage Grids in Respect to Increasing Load Behavior. In 2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2019 (pp. 1-5). [8994672] (Asia-Pacific Power and Energy Engineering Conference, APPEEC; Vol. 2019-December). doi.org/10.1109/appeec45492.2019.8994672

    Breithaupt, T., Leveringhaus, T., & Hofmann, L. (2019). Heuristic solution of a joint electric control reserve and wholesale market model. International Journal of Modeling, Simulation, and Scientific Computing, 10(2), 1940001. [1940001]. doi.org/10.1142/s1793962319400014

    Kalla, M., Korolova, O., Neufeld, A., Hofmann, L., & Ponick, B. (2019). Calculating frequency responses of synchronous machines using MIMO transfer functions. In Proceedings 2019 International Aegean Conference on Electrical Machines and Power Electronics, ACEMP 2019 and 2019 International Conference on Optimization of Electrical and Electronic Equipment, OPTIM 2019 (pp. 132-138) doi.org/10.1109/acemp-optim44294.2019.9007207

    Lager, T., & Hofmann, L. (2019). Advanced Short-Circuit Current Calculation for Doubly-Fed Induction Generator Based Wind Turbines According to IEC 60909. In Proceedings of 2019 IEEE PES Innovative Smart Grid Technologies Europe, ISGT-Europe 2019 (pp. 1-5). [8905579] doi.org/10.1109/isgteurope.2019.8905579

    Lager, T., & Hofmann, L. (2019). Improvement of the Consideration of Short-Circuit Current Contributions from Doubly-Fed Induction Generator Based Wind Turbines For Short-Circuit Current Calculation According to IEC 60909. In 2019 IEEE Milan PowerTech (pp. 1-6). [8810607] doi.org/10.1109/ptc.2019.8810607

    Neufeld, A., Heide, D., & Hofmann, L. (2019). Calculation of Series Resonance Frequencies in Electrical Grids Using Resonance Mode Analysis. In 2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2019 (pp. 1-4) doi.org/10.1109/appeec45492.2019.8994810

    Neufeld, A., & Hofmann, L. (Ed.) (2019). Energiewende: Wie bleiben die Netze stabil? Technik und Leben : Technische Vereine in und um Hannover informieren, (01/2019). www.vdi.de/fileadmin/pages/vdi_de/redakteure/vor_ort/bv/bv-hannover/Technik_und_Leben/190405_TuL_Ausgabe_web.pdf

    Neufeld, A., Schäkel, N., Hofmann, L., & Lösing, M. (2019). Probabilistic Calculation of Harmonic Voltages in Transmission Grids with Varying Shares of Underground Cables. In Cigré Symposium Aalborg - 2019

    Neufeld, A., Alkemper, M. J., Schäkel, N., & Hofmann, L. (2019). Simulative Calculation of the Grid-Connected Inverter Impedance for Harmonic Studies. In 2019 54th International Universities Power Engineering Conference, UPEC 2019 - Proceedings (pp. 1-5) doi.org/10.1109/upec.2019.8893508

    Pawellek, A., & Hofmann, L. (2019). Potentiale von HGÜ-Systemen im internationalen Netzregelverbund. In Dresdener Kreis 2019, Fachtagung der TU-Dresden, der Universität Hannover, der Universität Magdeburg und der Gesamthochschule Duisburg: Elektroenergieversorgung, Hannover, Deutschland, 27.-28. März 2019

    Pawellek, A., & Hofmann, L. (2019). Utilization of HVDC-Systems in the International Grid Control Cooperation. In 2019 IEEE Milan PowerTech (pp. 1-6). [8810806] doi.org/10.1109/ptc.2019.8810806

    Rüberg, S., Sewdien, V., Rueda Torres , J. L., Rakhshani, E., Wang, D., Tuinema, B., Farrokhseresht, N., Gusain, D., Perilla, A., Mola Jimenez, J., Longás Viejo, C., Breithaupt, T. J., Goudarzi, F., Meyer, K. R., Stallmann, F., Herrmann, M., Hofmann, L., Mertens, A., Hennig, T., ... Denis, G. (2019). Deliverable D1.6 Demonstration of Mitigation Measures and Clarification of Unclear Grid Code Requirements. www.h2020-migrate.eu/_Resources/Persistent/a7e3d4424f6f749e419ddac011419e7a0aa5f576/D1.6%20-%20Demonstration%20of%20Mitigation%20Measures%20and%20Clarification%20of%20Unclear%20Grid%20Code%20Requirements%20-%20final.pdf

    Sarstedt, M., Garske, S., Blaufuß, C., & Hofmann, L. (2019). Modelling of Integrated Transmission and Distribution Grids based on Synthetic Distribution Grid Models. In 2019 IEEE Milan PowerTech, PowerTech 2019 (pp. 1-6). [8810823] doi.org/10.1109/ptc.2019.8810823

    Sarstedt, M., Dokus, M., Gerster, J., Himker, N., Hofmann, L., Lehnhoff, S., & Mertens, A. (2019). Standardized evaluation of multi-level grid control strategies for future converter-dominated electric energy systems. Automatisierungstechnik, 67(11), 936 - 957. doi.org/10.1515/auto-2019-0061

    Schäkel, N., Neufeld, A., & Hofmann, L. (2019). Impact of Enhanced Synchronization Techniques of Wind Power Plants on the Short-Circuit Current. In 2019 IEEE PES Asia-Pacific Power and Energy Engineering Conference, APPEEC 2019 (pp. 1-5) doi.org/10.1109/appeec45492.2019.8994723

    Trentini, R., Kutzner, R., Hofmann, L., Oliveira, J. D., & Nied, A. (2019). On the Electromechanical Energy Approach: A Novel Modeling Method for Power Systems Stability Studies. IEEE Transactions on Power Systems, 34(3), 1771-1779. [8576590]. doi.org/10.1109/tpwrs.2018.2887001


    2018


    Blaufuß, C. J., & Hofmann, L. (2018). Methodik zur Optimierung des Netzausbaus in beanspruchten Verteilnetzen. Poster session presented at ETG-CIRED-Workshop 2018 (D-A-CH): Innovationen im Verteilnetz, Berlin, Germany.

    Garske, S., Sarstedt, M., & Hofmann, L. (2018). Bewertungsmethodik für die Anforderungen der Übertragungsnetzebene an die Blindleistungsbereitstellung der Verteilnetzebene. In 15. Symposium Energieinnovation www.tugraz.at/fileadmin/user_upload/Events/Eninnov2018/files/lf/Session_D3/536_LF_Garske.pdf

    Hennig, T., & Hofmann, L. (2018). Hybrid AC/DC Post-Contingency Power-Flow Algorithm Considering Control Interaction of Asynchronous Area. IEEE Transactions on Power Delivery, 33(1), 340-348. [8002593]. doi.org/10.1109/tpwrd.2017.2736420

    Hofmann, L., & Mertens, A. (2018). Aggregierte Modelle für die Simulation von dynamischen Vorgängen in elektromechanischen Energiesystemen (Kurzform: AMSES): Abschlussbericht. TEWISS Verlag, TEWISS-Technik und Wissen GmbH.

    Huisinga, H. H., & Hofmann, L. (2018). Aggregierte Modelle für die Simulation von dynamischen Vorgängen in elektromechanischen Energiesystemen: Zeitskalen-Modellierung zur effizienten Untersuchung von Wechselwirkungen in Elektroenergiesystemen. PZH Verlag, TEWISS - Technik und Wissen GmbH.

    Huisinga, H. H., & Hofmann, L. (2018). Order reduction in electrical power systems using singular perturbation in different coordinate systems. COMPEL - The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, 37(4), 1525 - 1534. doi.org/10.1108/COMPEL-08-2017-0360

    Leveringhaus, T., Breithaupt, T., Garske, S., & Hofmann, L. (2018). Modelling of Sequential Optimal Power Flow by Piecewise Linear Convexificated Quadratic Approximations. In 2018 International Conference on Power System Technology (POWERCON) (pp. 87-92)

    Neufeld, A., Schäkel, N., & Hofmann, L. (2018). Harmonic Resonance Analysis for Various Degrees of Cable Penetration in Transmission Grids. In 2018 53rd International Universities Power Engineering Conference (UPEC) (pp. 1-5) doi.org/10.1109/upec.2018.8541878

    Neufeld, A., Schäkel, N., & Hofmann, L. (2018). Resonanzuntersuchungen in Übertragungsnetzen mit unterschiedlichen Verkabelungsgraden. In 19. Dresdener Kreis 2018 (pp. 5). doi.org/10.24352/UB.OVGU-2019-033

    Pawellek, A., & Hofmann, L. (2018). Comparison of Methods for the Simulation of Dynamic Power Flows in the International Grid Control Cooperation. In 2018 IEEE Electronic Power Grid (eGrid) (pp. 1-6). [8598698] doi.org/10.1109/egrid.2018.8598698

    Sarstedt, M., Garske, S., & Hofmann, L. (2018). Application of PSO-Methods for the Solution of the economic Optimal Reactive Power Dispatch Problem. In Conference Record of the 3rd IEEE International Workshop on Electronic Power Grid, eGrid 2018 (pp. 1-6). [8598673] doi.org/10.1109/egrid.2018.8598673

    Schlömer, G., Garske, S., Gropengießer, M., & Hofmann, L. (2018). Abschätzung der Netzverluste von Verteilnetzbetreibern. EW – Magazin für die Energiewirtschaft, 117(6), 42-47.

    Sewdien, V. N., Meijden, M. V. D., Breithaupt, T., Hofmann, L., Herwig, D., Mertens, A., Tuinema, B. W., & Torres, J. L. R. (2018). Effects of Increasing Power Electronics on System Stability: Results from MIGRATE Questionnaire. In 2018 International Conference and Utility Exhibition on Green Energy for Sustainable Development (ICUE) (pp. 1-9). [8635602] (Proceedings of the Conference on the Industrial and Commercial Use of Energy, ICUE; Vol. 2018-October). doi.org/10.23919/ICUE-GESD.2018.8635602

    Stock, D. S., Sala, F., Berizzi, A., & Hofmann, L. (2018). Optimal Control of Wind Farms for Coordinated TSO-DSO Reactive Power Management. ENERGIES, 11(2), [173]. doi.org/10.3390/en11010173

    Velasquez, J., Castro, F., Babazadeh, D., Lehnhoff, S., Kumm, T., Heuberger, D., Treydel, R., Lüken, T., Garske, S., & Hofmann, L. (2018). Co-simulation set-up for testing controller interactions in distribution networks. In 2018 Workshop on Modeling and Simulation of Cyber-Physical Energy Systems, MSCPES 2018 - Held as part of CPS Week, Proceedings (pp. 1-6). [8405402] doi.org/10.1109/mscpes.2018.8405402

    Walter, A., Wiehe, J., Schlömer, G. J., Hashemifarzad, A., Wenzel, T., Albert, I., Hofmann, L., zum Hingst, J., & von Haaren, C. (2018). Naturverträgliche Energieversorgung aus 100 % erneuerbaren Energien 2050. (BfN-Skripten; Vol. 501). Bundesamt für Naturschutz.


    2017


    Akbulut, A., Becker, H., Mende, D., Stock, D. S., & Hofmann, L. (2017). Neighboring System as Black Start Source and Restoration Process based on the VSC-HVDC as Tie Line. In 2017 19th European Conference on Power Electronics and Applications: EPE 2017 ECCE Europe [8098993] Institute of Electrical and Electronics Engineers Inc.. doi.org/10.23919/epe17ecceeurope.2017.8098993

    Becker, H., Naranovich, A., Hennig, T., Akbulut, A., Mende, D., Stock, S., & Hofmann, L. (2017). System restoration using VSC-HVDC connected offshore wind power plant as black-start unit. In 2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe (pp. P.1-P.8). [8099007] doi.org/10.23919/epe17ecceeurope.2017.8099007

    Breithaupt, T., Leveringhaus, T., Rendel, T., & Hofmann, L. (2017). A MILP Approach for the Joint Simulation of Electric Control Reserve and Wholesale Markets. In F. De Rango, T. Oren, & M. S. Obaidat (Eds.), SIMULTECH 2017 - Proceedings of the 7th International Conference on Simulation and Modeling Methodologies, Technologies and Applications (pp. 314-322) doi.org/10.5220/0006441203140322

    Garske, S., Schloemer, G., & Hofmann, L. (2017). Evaluation of Reactive Power Management Strategies and Grid Loss Characteristics based on Generic Distribution Grid Models. In NEIS 2017; Conference on Sustainable Energy Supply and Energy Storage Systems (pp. 1-6)

    Garske, S., Blaufuß, C., Sarstedt, M., & Hofmann, L. (2017). Reactive power management analyses based on generic distribution grid models. In 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017 - Proceedings (pp. 1-6) doi.org/10.1109/isgteurope.2017.8260248

    Huisinga, H. H., & Hofmann, L. (2017). Order Reduction in Electric Power Systems using the Singular Perturbation Method under Application of the Extended Nodal Approach. Poster session presented at 19th International Symposium on Theoretical Electrical Engineering, Ilmenau, Germany.

    Kluß, L., Schlömer, G., & Hofmann, L. (2017). High Temperature Superconductor Cables in the German High Voltage Grid. Paper presented at IEEE Power and Energy Student Summit, Nürnberg, Bavaria, Germany.

    Schlömer, G., & Hofmann, L. (2017). Application of a logistical optimization method to optimize existing low-voltage grids. In 2017 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2017 - Proceedings (pp. 1-6) doi.org/10.1109/isgteurope.2017.8260185

    Schlömer, G., & Hofmann, L. (2017). Improved integration of Renewable Energies through comprehensive consideration of GIS-based Data in Grid-Planning of Low-Voltage Grids. NEIS 2017 - Conference on Sustainable Energy Supply and Energy Storage Systems.

    Schlömer, G., Blaufuß, C., & Hofmann, L. (2017). Modelling of Low-Voltage Grids with the Help of Open Data. In NEIS Conference 2016 (pp. 21-25)


    2016


    Becker, H., Hennig, T., Akbulut, A., Mende, D., & Hofmann, L. (2016). Netzwiederaufbaukonzepte: Mögliches Zusammenspiel zwischen Windenergieanlagen und thermischen Kraftwerken. VGB PowerTech, 10, 57-62.

    Blank, M., Blaufuß, C., Glötzel, M., Minnemann, J., Nieße, A., Pothen, F., Reinhold, C., Schwarz, J. S., Stahlecker, K., Wille, F., Witt, T., Rendel, T., Eggert, F., Engel, B., Geldermann, J., Hofmann, L., Hübler, M., Lehnhoff, S., Paech, N., & M., S. (2016). Whitepaper: Process for Simulation-based Sustainability Evaluation of Future Energy Scenarios. NEDS - Nachhaltige Energieversorgung Niedersachsen.

    Blaufuß, C. J., & Hofmann, L. (2016). Auswirkungen struktureller Veränderungen auf den Blindleistungshaushalt. netzpraxis - Das Magazin für Energieversorgung, 55 (2016)(Heft 3-4), 62-67.

    Blaufuß, C. J., & Hofmann, L. (2016). Auswirkungen struktureller Veränderungen auf den Blindleistungshaushalt und Strategien für ein zukünftiges Blindleistungsmanagement in Verteilnetzen. In Dresdener Kreis 2016

    Breithaupt, T., Herwig, D., Hofmann, L., Mertens, A., Meyer, R., Farrokhseresht, N., Tuinema, B., Wang, D., Rueda Torres, J., Rüberg, S., & Sewdien, V. (2016). Report on systemic issues, MIGRATE (Massive InteGRATion of power Electronic devices) Deliverable 1.1.

    Garske, S., Sarstedt, M., Hofmann, L., Velasquez, J., & Lehnhoff, S. (2016). Optimized reactive power management across different voltage levels on the example of medium-voltage grids. Journal of Energy Challenges and Mechanics. www.nscj.co.uk/JECM/PDF/3-3-3-Garske.pdf

    Hennig, T., Mende, D., & Hofmann, L. (2016). Efficiency evaluation of offshore power systems with power electronics based on SiC technology. In IEEE PES APPEEC 2016 - 2016 IEEE PES Asia Pacific Power and Energy Engineering Conference (pp. 634-639). [7779581] (Asia-Pacific Power and Energy Engineering Conference, APPEEC; Vol. 2016-December). doi.org/10.1109/appeec.2016.7779581

    Hennig, T., Bonin, M. V., Rohrig, K., Stock, S., & Hofmann, L. (2016). Investigation on reliability-driven network expansions of offshore transmission systems. In 2016 IEEE Innovative Smart Grid Technologies - Asia, ISGT-Asia 2016 (pp. 653-658). [7796462] doi.org/10.1109/isgt-asia.2016.7796462

    Hofmann, L., Schlömer, G., Breithaupt, T., Reese, C., Röhrig, M., Fehre, L., Gallmeier, U., Rohrsen, J., Schlager, K., & Sühlmann-Faul, F. (2016). Demand Response – Das Auto als Speicher und virtuelles Kraftwerk.

    Hofmann, L., Geldermann, J., Beck, H-P., Eggert, F., Engel, B., Weyer, H., Horn, M., Lietz, F., Loges, H., Lühn, T., Schlömer, G., Schnieder, R., & Ahmels, J. (2016). Forschungsprojekt e-home Energieprojekt 2020 : Kurzfassung der wissenschaftlichen Projektergebnisse 2011 - 2016. Cuvillier Verlag.

    Leveringhaus, T., & Hofmann, L. (2016). Optimal power flow comprising congestions and voltage management by global quadratic optimization of active and reactive power. In 2016 IEEE International Conference on Power System Technology, POWERCON 2016 (pp. 1-6). [7753927] doi.org/10.1109/powercon.2016.7753927

    Mende, D., Hennig, T., Akbulut, A., Becker, H., & Hofmann, L. (2016). Dynamic frequency support with DFIG wind turbines—A system study. In 2016 IEEE Electrical Power and Energy Conference, EPEC 2016 (pp. 1-7). [7771694] doi.org/10.1109/epec.2016.7771694

    Mende, D., Stock, S., Hennig, T., Löwer, L., & Hofmann, L. (2016). Effizientes Engpassmanagement im Spannungsfeld von technischer und wirtschaftlicher Optimierung. VDE-Kongress.

    Mende, D., Stock, D. S., Hennig, T., Löwer, L., & Hofmann, L. (2016). Multiobjective optimization in congestion management considering technical and economic aspects. In IEEE PES APPEEC 2016 - 2016 IEEE PES Asia Pacific Power and Energy Engineering Conference (pp. 1061-1066). [7779711] (Asia-Pacific Power and Energy Engineering Conference, APPEEC; Vol. 2016-December). doi.org/10.1109/appeec.2016.7779711

    Pawellek, A., & Hofmann, L. (2016). Dynamisches Engpassmanagement für den Netzregelverbund. In VDE Kongress

    Popp, M., Huisinga, H. H., Hofmann, L., & Mathis, W. (2016). CoSimMA: A Modular Simulation Framework Based on CCM. In Advanced Aspects of Theoretical Electrical Engineering

    Schlömer, G., & Hofmann, L. (2016). Eine Heuristik zur Umbauplanung von Niederspannungsnetzen ganzer Ortschaften. In Proceedings of the 14 Symposium Energieinnovation, Graz, Austria (pp. 10-12)

    Schlömer, G., & Hofmann, L. (2016). Optimization of grid expansion measures in low voltage grids using an integer linear optimization problem. In 2016 IEEE International Conference on Power System Technology, POWERCON 2016 (pp. 1-6). [7753923] doi.org/10.1109/powercon.2016.7753923

    Silveira, A., Trentini, R., Coelho, A., Kutzner, R., & Hofmann, L. (2016). Generalized minimum variance control under long-range prediction horizon setups. ISA transactions, 62, 325-332. doi.org/10.1016/j.isatra.2016.01.019

    Stock, D. S., Venzke, A., Hennig, T., & Hofmann, L. (2016). Model predictive control for reactive power management in transmission connected distribution grids. In IEEE PES APPEEC 2016 - 2016 IEEE PES Asia Pacific Power and Energy Engineering Conference (pp. 419-423). [7779538] doi.org/10.1109/appeec.2016.7779538

    Stock, S., & Hofmann, L. (2016). Moderne Optimierungsverfahren zum Betrieb von Windparkclustern in Norddeutschland. In EnInnov 2016--14. Symposium Energie innovation

    Stock, D. S., Venzke, A., Löwer, L., Rohrig, K., & Hofmann, L. (2016). Optimal reactive power management for transmission connected distribution grid with wind farms. In 2016 IEEE Innovative Smart Grid Technologies - Asia, ISGT-Asia 2016 (pp. 1076-1082). [7796535] doi.org/10.1109/isgt-asia.2016.7796535

    Trentini, R., Silveira, A., Bartsch, M. T., Kutzner, R., & Hofmann, L. (2016). On the design of stochastic RST controllers based on the generalized minimum variance. In 2016 UKACC International Conference on Control, UKACC Control 2016 (pp. 1-6). [7737552] doi.org/10.1109/control.2016.7737552

    Trentini, R., Silveira, A., Kutzner, R., & Hofmann, L. (2016). On the unrestricted horizon predictive control — A fully stochastic model-based predictive approach. In 2016 European Control Conference, ECC 2016 (pp. 1322-1327). [7810472] doi.org/10.1109/ecc.2016.7810472

    Trentini, R., Kutzner, R., & Hofmann, L. (2016). Power grid modeling based on the electromechanical energy approach aiming power systems stability studies. In 24th Mediterranean Conference on Control and Automation, MED 2016 (pp. 943-948). [7535986] doi.org/10.1109/med.2016.7535986

    Trentini, R., Kutzner, R., & Hofmann, L. (2016). State-space generalized minimum variance controller based PSS for damping of interarea modes. In C. Mavromoustakis, S. Louca, C. S. Pattichis, J. Georgiou, D. Michael, A. Paschalidou, E. Kyriacou, V. Vassiliou, C. Panayiotou, E. Kyriakides, G. Ellinas, G. Hadjichristofi, & C. Loizou (Eds.), Proceedings of the 18th Mediterranean Electrotechnical Conference: Intelligent and Efficient Technologies and Services for the Citizen, MELECON 2016 (pp. 1-6). [7495350] doi.org/10.1109/melcon.2016.7495350

    Trentini, R., Kutzner, R., & Hofmann, L. (2016). Stochastic speed governor based on the Generalized Minimum Variance Controller. Tagungsband der, 43.


    2015


    Blank, M., Breithaupt, T., Bremer, J., Dammasch, A., Garske, S., Klingenberg, T., Koch, S., Lünsdorf, O., Nieße, A., Scherfke, S., Sonnenschein, M., & Hofmann, L. (2015). Work Group: Scenario Design. In Smart Nord Final Report (pp. 21-30)

    Breithaupt, T., Garske, S., Rendel, T., & Hofmann, L. (2015). Work Package 4.1 Interconnected System. In Smart Nord – Final Report (pp. 169-183)

    Hofmann, L., & Sonnenschein, M. (2015). Smart Nord—Final Report. Hartmann GmbH: Hannover, Germany.

    Leveringhaus, T., & Hofmann, L. (2015). Combined and optimized redispatch management of multiple congestions and voltage deviations with active and reactive power based on AC-PTDFs with distributed slack. In 2015 IEEE Power and Energy Society General Meeting, PESGM 2015 (pp. 1-5). [7286314] (IEEE Power and Energy Society General Meeting; Vol. 2015-September). doi.org/10.1109/pesgm.2015.7286314

    Pawellek, A., & Hofmann, L. (2015). Erweiterte Konzepte Für Das Engpassmanagement Im Netzregelverbund. In Dresdener Kreis 2015

    Schlömer, G., Blaufuß, C., & Hofmann, L. (2015). Niederspannungsnetzplanung mit rONT-Einsatz. In Dresdener Kreis 2015, Fachtagung der Technischen Universität Dresden, der Leibniz Universität Hannover, der Otto-von-Guericke-Universität Magdeburg und der Universität Duisburg-Essen: Elektroenergieversorgung

    Schlömer, G., Reese, C., von Appen, H., & Hofmann, L. (2015). Technische Herausforderungen und Möglichkeiten zur Steuerung des Ladeverhaltens von Elektrofahrzeugen durch intelligente Ladestationen auf Basis der DIN IEC-61851. In Nachhaltige Energieversorgung und Integration von Speichern (pp. 121-126)

    Stock, S., Wildenhues, S., Henning, T., & Hofmann, L. (2015). Integration großer Mengen Windenergie in das elektrische Netz durch intelligente Netzanalyse und Clusterbetriebsführung. In 2. Fachkongress Zukünftige Stromnetze für Erneuerbare Energien

    Trentini, R., Kutzner, R., Hofmann, L., Campos, A., & Neto, CF. (2015). Modeling, parameter estimation and state-space control of a steam turbine. In Proceedings of the 23rd ABCM International Congress on Mechanical Engineering, Rio de Janeiro


    2014


    Becker, A., Lühn, T., Mohrmann, M., Schlömer, G., Schmidtmann, G., Schneider, D., Schnieder, R., Hofmann, L., Beck, H-P., Geldermann, J., & Weyer, H. (2014). Netzausbauvarianten in Niederspannungsverteilnetzen - Regelbare Ortsnetztransformatoren in Konkurrenz zu konventionellen Netzausbaumaßnahmen.

    Breithaupt, T., Rendel, T., & Hofmann, L. (2014). INES - Integrierte Netz- Und Energiemarktsimulation. In Dresdener Kreis 2014, Fachtagung Der TU-Dresden, Der Universität Hannover, Der Universität Magdeburg Und Der Gesamthochschule Duisburg: Elektroenergieversorgung, Leipzig, Deutschland,

    Brenner, S., & Hofmann, L. (2014). Resonance Analysis of Offshore Wind Farms Using Doubly Feed Induction Generators under Application of Grid Transfiguration Approach. In International Wind Engineering Conference (IWEC) - Support Structures Electrical Systems -, Hanover, Germany

    Fuchs, F., Dietz, R., Garske, S., Breithaupt, T., Mertens, A., & Hofmann, L. (2014). Challenges of grid integration of distributed generation in the interdisciplinary research project Smart Nord. In 2014 IEEE 5th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2014 (pp. 1-7). [6878627] doi.org/10.1109/pedg.2014.6878627

    Hennig, T., Löwer, L., Faiella, L. M., Stock, S., Jansen, M., Hofmann, L., & Rohrig, K. (2014). Ancillary services analysis of an offshore wind farm cluster--technical integration steps of a simulation tool. Energy Procedia, 53(C), 114-123. doi.org/10.1016/j.egypro.2014.07.220

    Hofmann, L., Hauser, E., Binder, J., Stock, S., Knorr, K., & Rohrig, K. (2014). Systemstabilität mit und durch erneuerbare Energien. In FVEE-Jahrestagung

    Leveringhaus, T., & Hofmann, L. (2014). Comparison of methods for state prediction: Power Flow Decomposition (PFD), AC Power Transfer Distribution factors (AC-PTDFs), and Power Transfer Distribution factors (PTDFs). In 2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC) (March ed., pp. 1-6). (Asia-Pacific Power and Energy Engineering Conference, APPEEC). doi.org/10.1109/appeec.2014.7066183

    Lühn, T., Schlömer, G., Schmidtmann, G., Lehde, B., Schmiesing, J., Hofmann, L., & Geldermann, J. (2014). Multi-criteria analysis of grid expansion concepts on the low voltage level. Zeitschrift für Energiewirtschaft, 38(3), 183-200.

    Schlömer, G., Reese, C., & Hofmann, L. (2014). Methode zur automatisierten Bewertung des zukünftigen Ausbaubedarfs in der Niederspannungsebene unter Berücksichtigung verschiedener technischer Konzepte. In 13. Symposium Energieinnovation

    Schlömer, G., & Hofmann, L. (2014). Planungswerkzeug Für Den Einsatz Regelbarer Ortsnetztransformatoren. netzpraxis - Das Magazin für Energieversorgung, Jg. 54, 65-67.

    Schlömer, G., & Hofmann, L. (2014). Verwendung synthetischer Netzstrukturen zur Analyse des Netzausbaubedarfs in der Niederspannungsebene. In Dresdener Kreis 2014, Fachtagung der TU-Dresden, der Universität Hannover, der Universität Magdeburg und der Gesamthochschule Duisburg: Elektroenergieversorgung, Leipzig, Deutschland, 19.-20. März 2014


    2013


    Beck, HP., Engel, B., Hofmann, L., Menges, R., Turek, T., & Weyer, H. (2013). Eignung von Speichertechnologien zum Erhalt der Systemsicherheit. FA, 43, 12.

    Breithaupt, T., Garske, S., Rendel, T., & Hofmann, L. (2013). Methodological Approach for Integrated Grid and Market Simulation of Coherent Distribution and Transmission Systems. In EnviroInfo (pp. 251-257)

    Buchhagen, C., Pawellek, A., Hofmann, L., & Däumling, H. (2013). Analysis of an inductive medium voltage transformer with compensated first natural frequency. In 2013 IEEE Power Energy Society General Meeting (pp. 1-5) doi.org/10.1109/PESMG.2013.6672839

    Buchhagen, C., Däumling, H., & Hofmann, L. (2013). Extension of a Capacitance Model for Inductive Medium Voltage Transformers. In International Conference on Power System Transients 2013

    Buchhagen, C., Hofmann, L., & Däumling, H. (2013). Influencing natural frequencies of inductive medium voltage transformers. In Dresdener Kreis 2013, Fachtagung der TU-Dresden, der Universität Hannover, der Universität Magdeburg und der Gesamthochschule Duisburg: Elektroenergieversorgung

    Buchhagen, C., Fischer, M., Hofmann, L., & Däumling, H. (2013). Metrological determination of the frequency response of inductive voltage transformers up to 20 kHz. In 2013 IEEE Power Energy Society General Meeting (pp. 1-5) doi.org/10.1109/PESMG.2013.6672835

    Garske, S., Brenner, S., & Hofmann, L. (2013). Zuverlässigkeitsbetrachtung Und Zustandsanalyse Der Netzanbindung von Offshore Windparks. In Dresdener Kreis 2013, Fachtagung Der TU-Dresden, Der Universität Hannover, Der Universität Magdeburg Und Der Gesamthochschule Duisburg: Elektroenergieversorgung, Duisburg, Germany

    Hofmann, L. (2013). Machbarkeitsstudie Zur Verknüpfung von Bahn- Und Energieleitungsinfrastrukturen. Elektrische Bahnen : EB ; Elektrotechnik im Verkehrswesen, (Heft 6-7), 392-400.

    Hofmann, L., Stock, S., Faiella, M., & Löwer, L. (2013). Systemdienstleistungen Durch Windenergie. Windenergie Report Deutschland 2012, Fraunhofer IWES, Kassel, Fraunhofer Verlag,.

    Mohrmann, M., Schlömer, G., & Hofmann, L. (2013). Entwicklung und Anwendung einer Datenbank zur Bewertung des Ausbaubedarfs von Niederspannungsnetzen. In Internationaler ETG-Kongress

    Mohrmann, M., Lehde, B., Hengelbrock, A., & Hofmann, L. (2013). Untersuchung der Veränderung von Haushaltslasten anhand von Messzeitreihen aus einem Forschungsprojekt. In Konferenz für Nachhaltige Energieversorgung und Integration von Speichern-NEIS 2013

    Reese, C., & Hofmann, L. (2013). Synthetic three-phase load profiles. In 22nd International Conference and Exhibition on Electricity Distribution (CIRED 2013) (pp. 1-4) doi.org/10.1049/cp.2013.1215


    2012


    Beck, H-P., Hofmann, L., Runge, K., Weyer, H., & Dietze, W. (2012). BMU-Studie Ökologische Auswirkungen von 380-kV-Erdleitungen und HGÜ-Erdleitungen - Zusammenfassung der wesentlichen Ergebnisse.

    Breithaupt, T., Rendel, T., Rathke, C., & Hofmann, L. (2012). Modeling the reliability of large thermal power plants in an integrated grid and market model. In 2012 IEEE International Conference on Power System Technology (POWERCON) (pp. 1-6) doi.org/10.1109/PowerCon.2012.6401366

    Breuer, A., Merschel, F., Noe, M., Goldacker, W., Oswald, B. R., Hofmann, L., Schmidt, F., & Stemmle, M. (2012). Superconducting medium-voltage cables for urban power supply as an alternative scenario to 110 kV installations. In CIGRE Session 2012

    Buchhagen, C., Hofmann, L., & Däumling, H. (2012). Analyse der Einflussgrößen auf die Eigenfrequenzen von Mittelspannungswandlern. In VDE Kongress 2012

    Buchhagen, C., Reese, C., Hofmann, L., & Däumling, H. (2012). Calculation of the frequency response of inductive medium voltage transformers. In 2012 IEEE International Energy Conference and Exhibition (ENERGYCON) (pp. 794-799)

    Buchhagen, C., Hofmann, L., & Däumling, H. (2012). Compensation of the first natural frequency of inductive medium voltage transformers. In 2012 IEEE International Conference on Power System Technology (POWERCON) (pp. 1-6) doi.org/10.1109/PowerCon.2012.6401406

    Buchhagen, C., Reese, C., Hofmann, L., & Däumling, H. (2012). Determination of a capacitance model for inductive medium voltage transformers. In PES T D 2012 (pp. 1-6) doi.org/10.1109/TDC.2012.6281501

    Golshani, A., Khakpour, A., & Hofmann, L. (2012). Facts based fault current limiter utilization in HV grid. In 2012 25th IEEE Canadian Conference on Electrical and Computer Engineering (CCECE) (pp. 1-6) doi.org/10.1109/CCECE.2012.6334818

    Hofmann, L., Mohrmann, M., & Rathke, C. (2012). BMU-Studie Ökologische Auswirkungen von 380-kV-Erdleitungen und HGÜ-Erdleitungen - Bericht der Arbeitsgruppe Technik/Ökonomie.

    Hofmann, L. (2012). Challenges and Solutions for Power Systems in the Future. In Transformer Life Management Conference

    Hofmann, L., & Rathke, C. (2012, Jun 5). Machbarkeitsstudie zur Verknüpfung von Bahn-und Energieleitungsinfrastrukturen: Ergebnisbericht zu Los 1 "Technische Machbarkeit der Nutzung von Bahnstromtrassen für Freileitungs- und Kabeltrassen öffentlicher Energieversorgung". Region Hannover.

    Leveringhaus, T., Breithaupt, T., & Hofmann, L. (2012). Physically based congestion management by powerflow superposition methods at optimal cost. In 2012 IEEE International Conference on Power System Technology (POWERCON) (pp. 1-5)

    Mathis, W., & Hofmann, L. (2012). Some Aspects of Modelling Wind Turbines and Aggregated Wind Turbines. In NDES 2012; Nonlinear Dynamics of Electronic Systems (pp. 1-5)

    Mohrmann, M., Lehde, B., Vielhauer, A., Bunk, M., Hofmann, L., & Engel, B. (2012). E-home Energieprojekt 2020. In CIRED Workshop 2012 Integration of Renewables into the Distribution Grid

    Mohrmann, M., Reese, C., & Hofmann, L. (2012). Lastfluss- Und Kurzschlussberechnung Zur Betriebsoptimierung (TP 07). (pp. 99-115).

    Mohrmann, M., Reese, C., Hofmann, L., & Schmiesing, J. (2012). Untersuchung von Niederspannungsverteilnetzen anhand von synthetischen Netzstrukturen. In VDE-Kongress, Stuttgart, Deutschland (Vol. 5)

    Rathke, C., Rendel, T., Breithaupt, T. J., Leveringhaus, T., & Hofmann, L. (2012). Influence of Offshore Wind Farms on the European Electricity Market and Transmission System. Paper presented at RAVE – International Conference 2012, Bremerhaven, Germany.

    Reese, C., Buchhagen, C., & Hofmann, L. (2012). Enhanced method for voltage range controlled OLTC-equipped distribution transformers. In 2012 IEEE Power and Energy Society General Meeting (pp. 1-8) doi.org/10.1109/PESGM.2012.6345416

    Reese, C., Mohrmann, M., Hofmann, L., & John, M. (2012). Umsetzung eines Verfahrens zum Einsatz von Ortsnetztransformatoren als Messwandler im Netzbetrieb. In VDE Kongress

    Reese, C., Buchhagen, C., & Hofmann, L. (2012). Voltage range as control input for OLTC-equipped distribution transformers. In PES T D 2012 (pp. 1-6) doi.org/10.1109/TDC.2012.6281619

    Rendel, T., Rathke, C., & Hofmann, L. (2012). Einfluss von Zusätzlicher Windeinspeisung Auf Den Energiehandel Und Die Netzbelastung in Europa. In VDE Kongress, Stuttgart, Deutschland,

    Rendel, T., Rathke, C., Breithaupt, T., & Hofmann, L. (2012). Integrated grid and power market simulation. In 2012 IEEE Power and Energy Society General Meeting (pp. 1-7) doi.org/10.1109/PESGM.2012.6345014

    Rendel, T., Rathke, C., & Hofmann, L. (2012). Kraftwerkseinsatzplanung in einem integrierten Netz-und Strommarktsimulator. TU Graz (Hrsg.), 12.

    Sonnenschein, M., Appelrath, HJ., Hofmann, L., Kurrat, M., Lehnhoff, S., Mayer, C., Mertens, A., Uslar, M., Nieße, A., & Tröschel, M. (2012). Dezentrale und selbstorganisierte koordination in smart grids. In VDE-Kongress 2012-Intelligente Energieversorgung der Zukunft

    Stemmle, M., Merschel, F., Noe, M., Hofmann, L., & Hobl, A. (2012). Superconducting MV cables to replace HV cables in urban area distribution grids. In PES T D 2012 (pp. 1-5) doi.org/10.1109/TDC.2012.6281443

    Stock, S., Faiella, M., Löwer, L., Rohrig, K., Hofmann, L., & Knorr, K. (2012). Improving Grid Integration of Wind Energy Power Plants. In German Wind Energy Conference DEWEK (Vol. 1)

    Weidner, J., & Hofmann, L. (2012). Machine Modelling for Transient Stability Analysis in Distribution Grids-A Comparison of Synchronous and Induction Machine Models in Medium and Low Voltage Grids. In SIMULTECH (pp. 367-376)

    Weidner, J., & Hofmann, L. (2012). Polar Coordinates for Space Phasors in Power System Transient and Small-Signal Stability Analysis. In NDES 2012; Nonlinear Dynamics of Electronic Systems (pp. 1-4)


    2011


    Amornvipas, C., & Hofmann, L. (2011). Allocating harmonic emission limits at HV and EHV based on IEC 61000–3–6 under consideration of global and future installations. In 2011 IEEE/PES Power Systems Conference and Exposition (pp. 1-8) doi.org/10.1109/PSCE.2011.5772468

    Appelrath, H-J., Beck, H-P., Hofmann, L., Huck, A., & Kurrat, M. (2011). Der netzorientierte Verbundbetrieb von dezentralen Anlagen im Niederspannungsnetz. In Internationaler ETG-Kongress 2011

    Hofmann, L. (2011). Future Electric Power Systems: Challenges and Solutions. In International Symposium on High Voltage Engineering,

    Hofmann, L. (2011). Offshore-Netzanschluss Und Offshore-Netze. In 2. VDI-Fachkonferenz: Offshore-Windenergieanlagen 2011

    Hofmann, L. (2011). Systemdienstleistungen von Windparkclustern. In Kasseler Symposium Energie-Systemtechnik

    Leveringhaus, T., & Hofmann, L. (2011). Optimized voltage and reactive power adjustment in power grids using the least-squares-method: Optimization of highly utilized power grids with stochastic renewable energy-sources. In 2011 International Conference on Power and Energy Systems (pp. 1-6)

    Lünsdorf, O., Sonnenschein, M., Mohrmann, M., Hofmann, L., [Unknown], G., Müller, P., & Kurrat, M. (2011). Möglichkeiten einer netzorientierten Betriebsweise zur weiteren Integration dezentraler Energieumwandlung auf Verteilnetzebene. In Internationaler ETG-Kongress 2011

    Noe, M., Stemmle, M., Schmidt, F., Merschel, F., Hofmann, L., & Bock, J. (2011). Neue Mittel- statt konventioneller Hochspannungsnetze durch Hochtemperatur-Supraleitung.

    Rathke, C., Rendel, T., & Hofmann, L. (2011). Entwicklung Eines Europäischen Strommarktsimulators. Elektrie Deutsche Elektrotechnik, Jg. 65, 85-87/2011, pp. 14-22, Verlag Dr. Heide Partner GmbH, September 2011, (Jg. 65, 85-87/2011,), 14-22.

    Reese, C., & Hofmann, L. (2011). Analysis and reduction of effects of single-phase loads and generators on low voltage distribution grids. In 21st International Conference on Electricity Distribution

    Rohrig, K., Knorr, K., & Hofmann, L. (2011). Transition to flexible renewable energy supply especially wind energy; Flexibilisierung der Erneuerbaren Energien insbesondere Windenergie. In VDE Kongress

    Rohrig, K., Knorr, K., & Hofmann, L. (2011). Transition to flexible renewable energy supply especially wind energy; Flexibilisierung der Erneuerbaren Energien insbesondere Windenergie. Zeitschrift für Energiewirtschaft.

    Stemmle, M., Merschel, F., Noe, M., Hofmann, L., & Hobl, A. (2011). Novel Grid Concepts for Urban Area Power Supply. In Superconductivity Centennial Conference EUCAS-ISEC-ICMC 2011 (SCC2011)

    Weidner, J., & Hofmann, L. (2011). Statische und Transiente Stabilität in Arealnetzen. In Dresdener Kreis 2011, Fachtagung der TU-Dresden, der Universität Hannover, der Universität Magdeburg und der Gesamthochschule Duisburg: Elektroenergieversorgung, Hannover, 28.-29. März 2011

    Weidner, J., & Hofmann, L. (2011). Statische Und Transiente Stabilität von Erzeugungsanlagen in Verteilnetzen. In VDE ETG Kongress 2011

    Wolter, M., & Hofmann, L. (2011). Agentenbasiertes energiemanagement zur spannungshaltung in verteilnetzen. At-Automatisierungstechnik, 59(3), 161-166.

    Wolter, M., & Hofmann, L. (2011). General estimation of reactive power control of DG sources on voltages in distribution grids. In IEEE 2011 EnergyTech (pp. 1-6) doi.org/10.1109/EnergyTech.2011.5948538

    Wolter, M., & Hofmann, L. (2011). General estimation of the impact of additional DG sources on distribution grids. In 2011 IEEE Power and Energy Society General Meeting (pp. 1-5) doi.org/10.1109/PES.2011.6039522


    2010


    Amornvipas, C., & Hofmann, L. (2010). Resonance analyses in transmission systems: Experience in Germany. In IEEE PES General Meeting (pp. 1-8) doi.org/10.1109/PES.2010.5588098

    Brenner, S., Wolter, M., & Hofmann, L. (2010). Influence of Inverter Dominated Small Energy Producers on the Voltage Stability of Distribution Grids in Steady-State. In IASTED AsiaPES 2010

    Leveringhaus, T., Wolter, M., & Hofmann, L. (2010). Scientific Analysis of Inter-TSO-Compensation-Algorithms by Physically-based Power Flow and Superposition Methods. In Proceedings of the Fourth IASTED Asian Conference on Power and Energy Systems: November 24 - 26, 2010, Phuket, Thailand - ACTA Press, 2010, 2010, Beitrag 701-089, S. 274-281 doi.org/10.2316/P.2010.701-089

    Wolter, M., & Hofmann, L. (2010). Allocation of responsibility for congestions in transmission systems based on power flow decomposition. In IASTED AsiaPES 2010

    Wolter, M., Guercke, H., Isermann, T., & Hofmann, L. (2010). Multi-agent based distributed power flow calculation. In IEEE PES General Meeting (pp. 1-6) doi.org/10.1109/PES.2010.5589910


    2009


    Mohrmann, M., Reese, C., & Hofmann, L. (2009). Tagungsband FTP 07 Lastfluss- Und Kurzschlussberechnung Zur Betriebsoptimierung. In 3. Symposium Des FEN

    Reese, C., & Hofmann, L. (2009). Determination of load and generation composition in distribution grids. In 2009 IEEE/PES Power Systems Conference and Exposition (pp. 1-7) doi.org/10.1109/PSCE.2009.4840127

    Weidner, J., & Hofmann, L. (2009). Statische Stabilität Des Einmaschinenproblems. In 3. Symposium Des FEN

    Wolter, M., Brenner, S., Isermann, T., & Hofmann, L. (2009). Application of adaptive agents in decentralized energy management systems for the purpose of voltage stability in distribution grids. In 41st North American Power Symposium (pp. 1-5)


    2008


    Amornvipas, C., & Hofmann, L. (2008). Method for analyzing effect of switching operations on system resonant behavior. In 2008 13th International Conference on Harmonics and Quality of Power (pp. 1-6) doi.org/10.1109/ICHQP.2008.4668758

    Drews, A., Rathke, C., Siebert, M., Heinemann, D., Hühnerbein, B., Hofmann, L., Koch, H., Kunze, H., Hoppensack, HJ., & Lohrenscheit, H. (2008). Network of offshore wind farms connected by gas insulated transmission lines. In Proc. Eur. Wind Energy Conf. Exhibition

    Hühnerbein, B., Reese, C., & Hofmann, L. (2008). Einfluss dezentraler Erzeuger auf die Energiequalität den Netzbetrieb und die Netztopologie. In Proc. 2008 VDE Kongress

    Hühnerbein, B., Reese, C., & Hofmann, L. (2008). Stochastisches Lastmodell (TP 4). In Tagungsband Zum 2. Statusseminar Des FEN, Braunschweig, 29.-30. Mai 2008

    Koch, H., Kunze, H., Pöhler, S., Hofmann, L., Rathke, C., & Müller, A. (2008). Gas Insulated Lines Reliable Power Transmission towards New Worldwide Challenges in Hydro and Wind Power Generation. In Cigre Session

    Rathke, C., Siebert, M., & Hofmann, L. (2008). Grid integration of offshore wind farms using gas-insulated transmission lines. In 7th International Workshop on Large Scale Integration of Wind Power and on Transmission Networks for Offshore Wind Farms

    Wolter, M., & Hofmann, L. (2008). Steigerung Der Energieeffizienz. VDI Technik und Leben, (Ausgabe 2/2008).


    2003


    Hofmann, L. (2003). Cable model with frequency dependent parameters calculated by using subconductors. European Transactions on Electrical Power, 13(1), 15-22.

    Hofmann, L. (2003). Effiziente Berechnung von Ausgleichsvorgängen in ausgedehnten Elektroenergiesystemen. Shaker.

    Hofmann, L. (2003). Series expansions for line series impedances considering different specific resistances, magnetic permeabilities, and dielectric permittivities of conductors, air, and ground. IEEE Transactions on Power Delivery, 18(2), 564-570. doi.org/10.1109/TPWRD.2003.810493


    2002


    Hofmann, L., & Oswald, B. R. (2002). Analytic Subsystem Formulation for the Efficient Simulation of Electric Power Systems. In 14. Power Systems Computation Conference (PSCC), Sevilla, 2002

    Hofmann, L. (2002). Effiziente Berechnung von Ausgleichsvorgängen Durch Analytische Teilsystembildung, Proceedings Workshop Im DFG-Schwerpunktprogramms ystemtheoretische Verfahren Zur Führung Transeuropäischer Energiesystemë (322 1059). In Dresdener Kreis 2002, Fachtagung Der TU-Dresden, Der Universität Hannover, Der Universität Magdeburg Und Der Gesamthochschule Duisburg: Elektroenergieversorgung, Wernigerode, 2002

    Hofmann, L., & Oswald, BR. (2002). Line Model in the Time Domain Considering Frequency Dependent Parameters, Leakance and Corona. In Proceedings of the 14th PSCC (pp. 1-7)


    2001


    Hofmann, L., & Oswald, BR. (2001). Efficient simulation of the dynamic behaviour of large-scale electric power systems. Electrical engineering, 83(5-6), 307-311.


    2000


    Hofmann, L., & Schneider, M. (2000). Transmission Line and Cable Impedances Calculated by Using Subconductors. In EEUG Meeting, Breslau, 2000


    1998


    Hofmann, L. (1998). Modellierung von Freileitungen mit frequenzabhängigen Parametern im Kurzzeitbereich. VDI Verlag GMBH.

    Hofmann, L. (1998). Neues Leitungsmodell mit frequenzabhängigen Parametern im Zeitbereich. Electrical engineering, 81(4), 225-232.

    Hofmann, L. (1998). New transmission line model with frequency dependent parameters in the time domain. Electrical engineering, 81(4), 225-232.


    1996


    Hofmann, L., & Oswald, B. R. (1996). Modelle von Freileitungen Und Kabeln Zur Berechnung von Transienten Vorgängen. In ETG-Fachbericht (pp. 165-174). (Nr. 63)..

    Hofmann, L., Oswald, BR., & Grabinski, H. (1996). Simulation of transients in power systems using a new transmission line model with frequency dependent parameters. In 12th Power Systems Computation Conference (pp. 674-680). (PSCC, Dresden).


    1995


    Hofmann, L. (1995). Modellierung von Hochspannungsleitungen mit frequenzabhangigen Parametern im Zustandsraum. Elektrie, 49(10), 379-393.

    Hofmann, L. (1995). State Space Simulation of Transients Using a Transmission Line Model with Frequency Dependent Parameters. In EEUG Meeting, Hannover 13.-14. November, 1995