@book{Mann2006, author = {Mann, Michael}, title = {Der Einfluss ver{\"a}nderlicher Erdbodenparameter auf das Ausbreitungsverhalten elektromagnetischer Felder niederer Frequenzen}, volume = {2006}, publisher = {Lehrstuhl f{\"u}r Hochspannungstechnik und Elektromagnetische Vertr{\"a}glichkeit, Univ.}, address = {Kaiserslautern}, isbn = {978-3-939432-28-9}, pages = {X, 199 S.}, year = {2006}, abstract = {Im Rahmen der Einf{\"u}hrung des weltweiten Digitalrundfunks (Digital Radio Mondiale) im Frequenzbereich der Langwelle, Mittelwelle und Kurzwelle interessiert f{\"u}r Lang- und Mittelwelle der Einfluss ver{\"a}nderlicher Parameter des Erdbodens auf das abgestrahlte Signal. Zur Funknetzplanung werden die im "World Atlas of Ground Conductivities" aufgef{\"u}hrten Bodenleitf{\"a}higkeitskarten der International Telecommunication Union (ITU) herangezogen, die jedoch nur einen groben {\"U}berblick {\"u}ber die Verh{\"a}ltnisse geben. In dieser Arbeit soll untersucht werden, ob die Karten der Bodenleitf{\"a}higkeit in ihrer Ortsaufl{\"o}sung gen{\"u}gend genau dargestellt sind und ob gegebenenfalls durch die Anwendung alternativer Verfahren genauere Karten erstellt werden k{\"o}nnen. Weiterhin sind unterschiedliche Verfahren zur Messung der Bodenleitf{\"a}higkeit bez{\"u}glich ihrer Anwendbarkeit zu beurteilen.}, subject = {Boden}, language = {de} } @misc{DoehringProbullaKomziketal.2018, author = {D{\"o}hring, Thorsten and Probulla, Theodor and Komzik, Richard and Mann, Michael and Sivanic, Peter and Stollenwerk, Manfred}, title = {Slovak-Bavarian collaboration on the development of telescope instrumentation}, editor = {Hambalek, Lubomir}, organization = {Hochschule Aschaffenburg}, pages = {1}, year = {2018}, abstract = {Within the project SLOBATCO (Slovak-Bavarian Telescope Collaboration) the Astronomical Institute of the Slovak Academy of Sciences and Aschaffenburg University of Applied Sciences collaborate in the development and commissioning of the new {\O}1.3 m astronomical telescope and the corresponding scientific instrumentation. The project is funded by the Bavarian Academic Center for Central, Eastern and Southeastern Europe (BAYHOST). Technical work packages are targeting filter wheel software for the VIS camera, additional IR filters, and an upgrade of the mirror coating facility by additional sputtering equipment.}, subject = {Spiegelteleskop}, language = {en} } @article{DoehringPribullaKomziketal.2019, author = {D{\"o}hring, Thorsten and Pribulla, Theodor and Komzik, Richard and Mann, Michael and Sivanic, Peter and Stollenwerk, Manfred}, title = {Slovak-Bavarian collaboration on the development of telescope instrumentation}, series = {Contributions of the Astronomical Observatory Skalnate Pleso}, volume = {2019}, journal = {Contributions of the Astronomical Observatory Skalnate Pleso}, number = {49 / 2}, pages = {154 -- 158}, year = {2019}, abstract = {Within the project SLOBATCO (Slovak-Bavarian Telescope Collaboration) the Astronomical Institute of the Slovak Academy of Sciences and Aschaffenburg University of Applied Sciences collaborate in the development and commissioning of scientific instrumentation for the new {\O}1.3 m astronomical telescope at the Skalnat{\´e} Pleso observatory. The joint project is funded by the Bavarian Academic Center for Central, Eastern and Southeastern Europe (BAYHOST). Planned technical work packages are targeting the filter wheel software for the VIS camera, additional IR filters, and an upgrade of the mirror coating facility by additional sputtering equipment.}, subject = {Spiegelteleskop}, language = {en} } @misc{MannDoehringPribullaetal.2019, author = {Mann, Michael and D{\"o}hring, Thorsten and Pribulla, Theodor and Komzik, Richard and Sivanic, Peter and Stollenwerk, Manfred}, title = {Power quality evaluation for observatories}, editor = {Skopal, Augustin}, organization = {TH Aschaffenburg}, pages = {1}, year = {2019}, abstract = {Within the project SLOBATCO the question did arise, to what extend observatories have to rely on adequate power quality, e.g. the perfect sinusoidal shape of supply voltage and current, in order to ensure safe operation and accurate measurement results. International power quality standards are put in perspective with requirement specifications. Telescope operators indicate partial or total loss of function of measurement instruments. Measurements conducted during SLOBATCO project substantiate the need for power quality measurement campaigns.}, subject = {Sternwarte}, language = {en} } @article{MannPribullaDoehringetal.2019, author = {Mann, Michael and Pribulla, Theodor and D{\"o}hring, Thorsten and Komzik, Richard and Sivanic, Peter}, title = {Power quality—Evaluation of safe operation of observatories}, series = {Astronomische Nachrichten}, volume = {2019}, journal = {Astronomische Nachrichten}, number = {340}, doi = {10.1002/asna.201913672}, pages = {658 -- 665}, year = {2019}, abstract = {The electric power supply of astronomical observatories has to manage a conflict of interest: Observatories are situated at remote locations, they have a high consumption of electric power while measuring electric signals as sensitively as possible. Within the project SLOBATCO, the question did arise, to what extent observatories have to rely on adequate power quality, for example, the perfectly sinusoidal shape of supply voltage and current, to ensure safe operation and accurate measurement results. International power quality standards are put in perspective with requirement specifications for observatories. This contribution describes themotivation, the underlying mechanisms that lead to issues, comments on the challenge in power systems engineering, proposes the instrumentation and installation, and interprets the first results. Experimental results clearly motivate the need for further measurement campaigns, as power-quality-related problems are common. A summary is provided together with an outlook and a motivation for future measurement campaigns.}, subject = {Sternwarte}, language = {en} } @incollection{MannWenzlerDoehringetal.2022, author = {Mann, Michael and Wenzler, Sebastian and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Pribulla, Theodor and Sivanič, Peter and Komž{\´i}k, Richard}, title = {Stromversorgung als Umweltfaktor: Analyse der elektrischen Netzqualit{\"a}t in astronomischen Observatorien}, series = {Umwelteinfl{\"u}sse erfassen, simulieren, bewerten}, volume = {2022}, booktitle = {Umwelteinfl{\"u}sse erfassen, simulieren, bewerten}, editor = {Karl Friedrich, Zieghahn}, publisher = {Gesellschaft f{\"u}r Umweltsimulation e.V.}, isbn = {978-3-9818507-7-2}, pages = {193 -- 207}, year = {2022}, subject = {Sternwarte}, language = {de} } @inproceedings{MannDoehringStollenwerketal.2024, author = {Mann, Michael and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Priebsch, Alessandro and Pribulla, Theodor and Komž{\´i}k, Richard M. and Sivanic, Peter}, title = {Advanced power quality measurement techniques at the electric power grid of astronomical observatories}, series = {Observatory Operations: Strategies, Processes, and Systems X, Conference of SPIE 13098, 17 - 20 June 2024}, booktitle = {Observatory Operations: Strategies, Processes, and Systems X, Conference of SPIE 13098, 17 - 20 June 2024}, editor = {Storrie-Lombardi, Lisa J. and Benn, Chris R. and Chrysostomou, Antonio}, publisher = {SPIE}, doi = {10.1117/12.3016562}, year = {2024}, subject = {Sternwarte}, language = {en} } @article{MahtoMahatoChandanetal.2024, author = {Mahto, Kailash Kumar and Mahato, Bidyut and Chandan, Bikramaditya and Das, Durbanjali and Das, Priyanath and Fotis, Georgios and Vita, Vasiliki and Mann, Michael}, title = {A New Symmetrical Source-Based DC/AC Converter with Experimental Verification}, series = {Electronics}, volume = {13}, journal = {Electronics}, number = {10}, publisher = {MDPI AG}, issn = {2079-9292}, doi = {http://dx.doi.org/10.3390/electronics13101975}, year = {2024}, abstract = {This research paper introduces a new topology for multilevel inverters, emphasizing the reduction of harmonic distortion and the optimization of the component count. The complexity of an inverter is determined by the number of power switches, which is significantly reduced in the presented topology, as fewer switches require fewer driver circuits. In this proposed topology, a new single-phase generalized multilevel inverter is analyzed with an equal magnitude of voltage supply. A 9-level, 11-level, or 13-level symmetrical inverter with RL load is analyzed in MATLAB/Simulink 2019b and then experimentally validated using the dSPACE-1103 controller. The experimental verification of the load voltage and current with different modulation indices is also presented. The analysis of the proposed topology concludes that the total required number of components is lower than that necessary for the classical inverter topologies, as well as for some new proposed multilevel inverters that are also compared with the proposed topology in terms of gate driver circuits, power switches, and DC sources, which thereby enhances the goodness of the proposed topology. Thus, a comparison of this inverter with the other topologies validates its acceptance.}, subject = {Spannungswandler}, language = {en} } @inproceedings{MannDoehringStollenwerketal.2022, author = {Mann, Michael and D{\"o}hring, Thorsten and Stollenwerk, Manfred and Wenzler, Sebastian and Pribulla, Theodor and Komž{\´i}k, Richard M. and Sivanic, Peter}, title = {On the importance of the electrical grid power quality for astronomical observatories}, series = {Proceedings of SPIE: Observatory Operations: Strategies, Processes, and Systems IX}, booktitle = {Proceedings of SPIE: Observatory Operations: Strategies, Processes, and Systems IX}, editor = {Benn, Chris R. and Seaman, Robert L. and Adler, David S.}, publisher = {SPIE}, doi = {http://dx.doi.org/10.1117/12.2627227}, year = {2022}, subject = {Elektrizit{\"a}tsversorgung}, language = {en} } @inproceedings{GirvanStolteMann2020, author = {Girvan, Philipp and Stolte, Andreas and Mann, Michael}, title = {Conceptualising Different Approaches to the New Redispatch Procedure in Germany with Special Regard to the Distribution of Competences among the Grid Operators}, publisher = {IEEE}, organization = {IEEE}, isbn = {9783800753383}, year = {2020}, abstract = {P. Girvan, A. Stolte and M. Mann, "Conceptualising Different Approaches to the New Redispatch Procedure in Germany with Special Regard to the Distribution of Competences among the Grid Operators," PESS 2020; IEEE Power and Energy Student Summit, Online, 2020, pp. 1-6. New regulations in Germany bring forth the question how a new Redispatch procedure can better integrate renewable energies into the congestion management. These changes fall back to the amendment of the German law on power line expansion from Mai 2019 [1]. This debate got picked up by the German Association of Energy in 2019 [2]. Since then Redispatch 2.0 has become a major topic for grid operators, especially for the DSO which will see major impacts on the congestion management. Redispatch describes the process of resolving grid congestion by adjusting the schedule of conventional power plants. With a high amount of renewables on their grid Germany has seen a drastic increase in grid congestion and the resulting costs [3]. For that reason, the government decided to adapt the Redispatch process and in- clude renewable energy power plants into it. While this new approach promises to resolve some of the costly problems with the current Redispatch, it also introduces a big challenge to the grid operators. This calls for a new approach to the distribution of competencies among the grid operators. With this need in mind, three different possible concepts for the new Redispatch are developed and evaluated within three unique scenarios. This evaluation shows that a concept, which focuses on a Redispatch lead by the TSO, is most adapt for the new requirements. This result is picked up in the recommendation of action, where further research is encouraged.}, subject = {Elektrizit{\"a}tsversorgungsnetz}, language = {de} } @article{DasMahatoChandanetal.2024, author = {Das, Durbanjali and Mahato, Bidyut and Chandan, Bikramaditya and Joshi, Hitesh and Mahto, Kailash Kumar and Das, Priyanath and Fotis, Georgios and Vita, Vasiliki and Mann, Michael}, title = {A New Cascaded Multilevel Inverter for Modular Structure and Reduced Passive Components}, series = {Electronics}, volume = {13}, journal = {Electronics}, number = {17}, publisher = {MDPI AG}, issn = {2079-9292}, doi = {http://dx.doi.org/10.3390/electronics13173566}, year = {2024}, abstract = {In high-power applications, achieving adequate power quality in power converter design is accomplished by utilizing multilevel inverters instead of using two-level and three-level inverters. The device generates a sinusoidal output voltage, which results in reduced total harmonic distortion and lower voltage stress on the switches and leads to lower electromagnetic interference, making it suitable for use in renewable energy applications. However, to illustrate the advantages mentioned above, a significant number of switching devices and DC sources are necessary while raising the voltage levels. This article proposes an asymmetrical voltage generation method, which operates in a ratio of 1:5 and generates 25 levels using 11 power switches. The topology is modular in structure, and each module has a lower component count, which significantly reduces the overall cost. The proposed topology is capable of generating negative output voltage levels without the use of an H-bridge configuration, where only three switches are used to generate any voltage levels. The functionality of the developed module is amended by fixing different voltage values in DC sources. This article also presents a comprehensive examination of the circuit and the functioning of various voltage levels. The advantages of the proposed inverter have been demonstrated by comparative research with the currently existing MLI topologies. Ultimately, both the simulation and experimental findings validated the practical capabilities.}, subject = {Mehrpunktwechselrichter}, language = {en} }