@article{35589, author = {{Dragicevic, Tomislav and Parisio, Alessandra and Rodriguez, Jose and Jones, Colin and Quevedo, Daniel and Ferrarini, Luca and Preindl, Matthias and Shafiee, Qobad and Morstyn, Thomas}}, issn = {{0885-8969}}, journal = {{IEEE Transactions on Energy Conversion}}, keywords = {{Electrical and Electronic Engineering, Energy Engineering and Power Technology}}, number = {{2}}, pages = {{1311--1312}}, publisher = {{Institute of Electrical and Electronics Engineers (IEEE)}}, title = {{{Guest Editorial Model Predictive Control in Energy Conversion Systems}}}, doi = {{10.1109/tec.2021.3076279}}, volume = {{36}}, year = {{2021}}, } @article{53086, author = {{Zhang, Hao and Kaczmarek, Dennis and Rudolph, Charlotte and Schmitt, Steffen and Gaiser, Nina and Oßwald, Patrick and Bierkandt, Thomas and Kasper, Tina and Atakan, Burak and Kohse-Höinghaus, Katharina}}, issn = {{0010-2180}}, journal = {{Combustion and Flame}}, keywords = {{General Physics and Astronomy, Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering, General Chemistry}}, publisher = {{Elsevier BV}}, title = {{{Dimethyl ether (DME) and dimethoxymethane (DMM) as reaction enhancers for methane: Combining flame experiments with model-assisted exploration of a polygeneration process}}}, doi = {{10.1016/j.combustflame.2021.111863}}, volume = {{237}}, year = {{2021}}, } @article{53085, author = {{Gaiser, Nina and Bierkandt, Thomas and Oßwald, Patrick and Zinsmeister, Julia and Kathrotia, Trupti and Shaqiri, Shkelqim and Hemberger, Patrick and Kasper, Tina and Aigner, Manfred and Köhler, Markus}}, issn = {{0016-2361}}, journal = {{Fuel}}, keywords = {{Organic Chemistry, Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering}}, publisher = {{Elsevier BV}}, title = {{{Oxidation of oxymethylene ether (OME0−5): An experimental systematic study by mass spectrometry and photoelectron photoion coincidence spectroscopy}}}, doi = {{10.1016/j.fuel.2021.122650}}, volume = {{313}}, year = {{2021}}, } @article{53087, author = {{Hemberger, Patrick and Bodi, Andras and Bierkandt, Thomas and Köhler, Markus and Kaczmarek, Dennis and Kasper, Tina}}, issn = {{0887-0624}}, journal = {{Energy & Fuels}}, keywords = {{Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering}}, number = {{20}}, pages = {{16265--16302}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Photoelectron Photoion Coincidence Spectroscopy Provides Mechanistic Insights in Fuel Synthesis and Conversion}}}, doi = {{10.1021/acs.energyfuels.1c01712}}, volume = {{35}}, year = {{2021}}, } @article{40566, author = {{Rodríguez-Gómez, Alberto and Lepre, Enrico and Sánchez-Silva, Luz and Lopez Salas, Nieves and de la Osa, Ana Raquel}}, issn = {{2095-4956}}, journal = {{Journal of Energy Chemistry}}, keywords = {{Electrochemistry, Energy (miscellaneous), Energy Engineering and Power Technology, Fuel Technology}}, pages = {{168--180}}, publisher = {{Elsevier BV}}, title = {{{PtRu nanoparticles supported on noble carbons for ethanol electrooxidation}}}, doi = {{10.1016/j.jechem.2021.07.004}}, volume = {{66}}, year = {{2021}}, } @inproceedings{29899, abstract = {{LLC resonant converters are typically unsuitable to be applied for wide voltage-transfer ratio applications. With a full-bridge inverter, however, they can be operated in a variety of different modulations. Most notably, by permanently turning on one MOSFET and turning off the other MOSFET of the same bridge leg, the LLC can be operated in half-bridge configuration reducing the gain by a factor of two. The resonant capacitor is hereby charged to an average voltage of half the input voltage. In this modulation, however, the switch that is permanently turned on is stressed by the complete resonant current while exhibiting no switching losses. This paper proves that the frequency-doubler modulation can better balance the losses among all MOSFETs and should be the preferred mode of operation favored over the conventional half-bridge modulation. This paper analyzes the beneficial loss distribution, proposes an on-the-fly morphing modulation and discusses potential operating strategies to further reduce the junction temperature. Furthermore, it is shown that this modulation can also be altered to achieve the asymmetrical LLC operation. Experimental measurement results show that the modulation results in a substantial decrease of the maximum MOSFET temperature and shows that the converter can be smoothly transitioned during operation from full-bridge modulation to the frequency-doubler half-bridge operation and back.}}, author = {{Rehlaender, Philipp and Unruh, Roland and Hankeln, Lars and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)}}, isbn = {{978-9-0758-1537-5}}, keywords = {{Resonant converter, High frequency power converter, Switched-mode power supply, Converter control, Control methods for electrical systems}}, location = {{Ghent, Belgium}}, publisher = {{IEEE}}, title = {{{Frequency-Doubler Modulation for Reduced Junction Temperatures for LLC Resonant Converters Operated in Half-Bridge Configuration}}}, doi = {{10.23919/EPE21ECCEEurope50061.2021.9570674}}, year = {{2021}}, } @article{45014, author = {{Abbas, Wameedh Khider Abbas and Vrabec, Jadran}}, issn = {{0196-8904}}, journal = {{Energy Conversion and Management}}, keywords = {{Energy Engineering and Power Technology, Fuel Technology, Nuclear Energy and Engineering, Renewable Energy, Sustainability and the Environment}}, publisher = {{Elsevier BV}}, title = {{{Cascaded dual-loop organic Rankine cycle with alkanes and low global warming potential refrigerants as working fluids}}}, doi = {{10.1016/j.enconman.2021.114843}}, volume = {{249}}, year = {{2021}}, } @techreport{23568, abstract = {{We study the structure of power networks in consideration of local protests against certain power lines (’not-in-my-backyard’). An application of a network formation game is used to determine whether or not such protests arise. We examine the existence of stable networks and their characteristics, when no player wants to make an alteration. Stability within this game is only reached if each player is sufficiently connected to a power source but is not linked to more players than necessary. In addition we introduce an algorithm that creates a stable network.}}, author = {{Block, Lukas}}, keywords = {{Network formation, NIMBY, Power networks, Nash stability}}, title = {{{Network formation with NIMBY constraints}}}, year = {{2020}}, } @inproceedings{29939, abstract = {{In this paper, a full-bridge modular multilevel converter (MMC) and two half-bridge-based MMCs are evaluated for high-current low-voltage e.g. 100 - 400V DC-applications such as electrolysis, arc welding or datacenters with DC-power distribution. Usually, modular multilevel converters are used in high-voltage DC-applications (HVDC) in the multiple kV-range, but to meet the needs of a high-current demand at low output voltage levels, the modular converter concept requires adaptations. In the proposed concept, the MMC is used to step-down the three-phase medium-voltage of 10kV, and provide up to 1 MW to the load. Therefore, each module is extended by an LLC resonant converter to adapt to the specific electrolyzers DC-voltage range of 142 - 220V and to provide galvanic isolation. The six-arm MMC converter with half-bridge modules can be simplified and optimized by removing three arms, and thus halving the number of modules. In addition, the module voltage ripple and capacitor losses are decreased by 22% and 30% respectively. By rearranging the components of the half-bridge MMC to build a MMC consisting of grid-side full-bridge modules, the voltage ripple is further reduced by 78% and capacitor losses by 64%, while ensuring identical costs and volume for all MMCs. Finally, the LLC resonant converter is designed for the most efficient full-bridge MMC. The LLC can not operate at resonance with a fixed nominal module voltage of 770V because the output voltage is varying between 142 - 220V. By decreasing the module voltage down to 600V, additional points of operation can be operated in resonance, and the remaining are closer to resonance. The option to decrease the module voltage down to 600V, increases the number of required modules per arm from 12 to 15, which requires to balance the losses of the LLCs and the grid-side stages.}}, author = {{Unruh, Roland and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)}}, keywords = {{Multilevel converters, Resonant converter, High voltage power converters, ZVS Converters, Combination MMC LLC}}, location = {{Lyon, France}}, publisher = {{IEEE}}, title = {{{Evaluation of MMCs for High-Power Low-Voltage DC-Applications in Combination with the Module LLC-Design}}}, doi = {{10.23919/epe20ecceeurope43536.2020.9215687}}, year = {{2020}}, } @article{34643, author = {{Liphardt, L. and Suematsu, K. and Grundmeier, Guido}}, issn = {{0360-3199}}, journal = {{International Journal of Hydrogen Energy}}, keywords = {{Energy Engineering and Power Technology, Condensed Matter Physics, Fuel Technology, Renewable Energy, Sustainability and the Environment}}, number = {{5}}, pages = {{4399--4406}}, publisher = {{Elsevier BV}}, title = {{{Kinetic studies of cathode degradation on PEM fuel cell short stack level undergoing freeze startups with different states of residual water and current draws}}}, doi = {{10.1016/j.ijhydene.2020.10.273}}, volume = {{46}}, year = {{2020}}, } @inproceedings{18387, abstract = {{ During comparative measurements of different PV microinverters, two yield issues came up that could not be explored via conventional efficiency measurements, but do have a significant impact on electrical energy yield: First category of issues are either sluggish or nervously acting maximum–power–point–tracking devices, which lead to reduced energy yields. The other category of issues is thermal: As a first explanation for observed reduced energy yields, it has been assumed that the conversion efficiency degrades at higher operating temperatures. This matter has been investigated in this article: A change in conversion efficiency could not be observed for elevated operation temperatures up to 50°C, despite high-precision and repeated measurements. But it was found that some inverters temporarily interrupted (or entirely stopped) operation after long periods of running at high temperatures. Also, a reduction in potential maximum power output has been detected for those inverters. Summarizing: With a high degree of certainty it can be stated that those reported yield losses have been caused by the temporary shutdowns and power limitations of the inverters.}}, author = {{Krauter, Stefan and Bendfeld, Jörg}}, booktitle = {{Proceedings of the EU PVSEC 2020 }}, issn = {{3-936338-73-6}}, keywords = {{AC-modules, Microinverter, Power Conditioning, Thermal Performance, Ventilation, Stability, Efficiency, Yield}}, location = {{online}}, pages = {{1179 -- 1180}}, title = {{{Elevated Temperatures Affecting Efficiency, Overall Performance and Energy Yield of PV Microinverters}}}, doi = {{10.4229/EUPVSEC20202020-4AV.3.6}}, year = {{2020}}, } @inproceedings{29880, abstract = {{Although there are numerous design methodologies for the LLC resonant converter, they often do not consider the possibility of input voltage adjustment. In the proposed concept, a modular multi-level converter (MMC) is used to step-down the three-phase medium voltage of 10 kV, and provide up to 1 MW of pure DC power to the load consisting of electrolyzers for hydrogen generation. Therefore, each module is extended by an LLC resonant converter to adapt to the specific electrolyzers DC voltage range of 142...220 V and to provide galvanic isolation. In order to achieve a high efficiency for a wide range of load conditions, the input voltage of the LLC converter is adjusted between 600 V and 770 V while operating at resonance or close to resonance. The parameters of the 11kW LLC resonant converter with an integrated leakage inductance are systematically optimized to maximize the efficiency for all loads while achieving zero-voltage switching. For a fast estimation of eddy current losses, a new method is proposed, which uses a single FEM simulation to fit newly developed loss equations. The calculated average efficiency is 97.8%. The prototype of the LLC converter reaches a peak efficiency of over 98% at resonance at half load which is similar to the precalculated value.}}, author = {{Unruh, Roland and Schafmeister, Frank and Böcker, Joachim}}, booktitle = {{2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)}}, keywords = {{Full-bridge, High voltage power converters, LLC resonant converter, Multilevel converters, ZVS Converters}}, publisher = {{IEEE}}, title = {{{11kW, 70kHz LLC Converter Design with Adaptive Input Voltage for 98% Efficiency in an MMC}}}, doi = {{10.1109/compel49091.2020.9265771}}, year = {{2020}}, } @article{32487, author = {{Glaznev, Roman K. and Karpov, Alexander I. and Korobeinichev, Oleg P. and Bolkisev, Andrei A. and Shaklein, Artem A. and Shmakov, Andrey G. and Paletsky, Alexander A. and Gonchikzhapov, Munko B. and Kumar, Amit}}, issn = {{0010-2180}}, journal = {{Combustion and Flame}}, keywords = {{General Physics and Astronomy, Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering, General Chemistry}}, pages = {{358--367}}, publisher = {{Elsevier BV}}, title = {{{Experimental and numerical study of polyoxymethylene (Aldrich) combustion in counterflow}}}, doi = {{10.1016/j.combustflame.2019.04.032}}, volume = {{205}}, year = {{2019}}, } @article{6632, abstract = {{Many processes in industrial and domestic applications require heating or cooling at certain steps of a process. Even if the process itself cannot be shifted towards periods of high PV output (which would be favorable), the heating and cooling necessities can be carried out via an inexpensive thermal storage instead of a costly electrical storage. Examples are: distillation units, washing machines, dishwashers, coolers, freezers. The resulting “shiftability” of power consumption can be a business model by offering that availability of load dispatching on the balancing power market. An example using PCM as cooling storage for refrigerators that has been investigated: A focus of this paper is the use of that load shifting ability to provide balancing power. Another emphasis is on the protection of individual consumer data: To keep the state of use of each individual consumer (actually: interactive consumer or “prosumer”) anonymous, but still performing the sales of balancing power, the orders for load-dispatching can be transmitted via transmitted via a regional, non-individual broadcasting message within the GSM network. Demonstrating DSMs capacities, abilities and limits concerning domestic applications is an important task to prepare large-scale implementation and to convince stakeholders. To reaching that goal, several realistic DSM scenarios for cooling applications and freezers have been developed with the prerequisite that DSM activities are supposed to be without comfort losses and without restrictions for consumers while the limits for lower and upper temperature for food are maintained.}}, author = {{Krauter, Stefan and Prior, Dirk}}, issn = {{1876-6102}}, journal = {{Energy Procedia}}, keywords = {{DSM, load management, load shifting, PCM, thermal storage, balancing power}}, pages = {{210 -- 226}}, title = {{{Minimizing storage costs by substituting centralized electrical storage by thermal storage at the end user, also suppling balancing power for grid operation}}}, doi = {{https://doi.org/10.1016/j.egypro.2017.09.505}}, volume = {{135}}, year = {{2017}}, } @inproceedings{10780, author = {{Guettatfi, Zakarya and Hübner, Philipp and Platzner, Marco and Rinner, Bernhard}}, booktitle = {{12th International Symposium on Reconfigurable Communication-centric Systems-on-Chip (ReCoSoC)}}, keywords = {{embedded systems, image sensors, power aware computing, wireless sensor networks, Zynq-based VSN node prototype, computational self-awareness, design approach, platform levels, power consumption, visual sensor networks, visual sensor nodes, Cameras, Hardware, Middleware, Multicore processing, Operating systems, Runtime, Reconfigurable platforms, distributed embedded systems, performance-resource trade-off, self-awareness, visual sensor nodes}}, pages = {{1--8}}, title = {{{Computational self-awareness as design approach for visual sensor nodes}}}, doi = {{10.1109/ReCoSoC.2017.8016147}}, year = {{2017}}, } @article{32493, author = {{Rakesh Ranga, H.R. and Korobeinichev, O.P. and Harish, A. and Raghavan, Vasudevan and Kumar, A. and Gerasimov, I.E. and Gonchikzhapov, M.B. and Tereshchenko, A.G. and Trubachev, S.A. and Shmakov, A.G.}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, pages = {{477--491}}, publisher = {{Elsevier BV}}, title = {{{Investigation of the structure and spread rate of flames over PMMA slabs}}}, doi = {{10.1016/j.applthermaleng.2017.11.041}}, volume = {{130}}, year = {{2017}}, } @article{32482, author = {{Korobeinichev, Oleg and Gonchikzhapov, Munko and Tereshchenko, Alexander and Gerasimov, Ilya and Shmakov, Andrey and Paletsky, Alexander and Karpov, Alexander}}, issn = {{0010-2180}}, journal = {{Combustion and Flame}}, keywords = {{General Physics and Astronomy, Energy Engineering and Power Technology, Fuel Technology, General Chemical Engineering, General Chemistry}}, pages = {{388--398}}, publisher = {{Elsevier BV}}, title = {{{An experimental study of horizontal flame spread over PMMA surface in still air}}}, doi = {{10.1016/j.combustflame.2017.10.008}}, volume = {{188}}, year = {{2017}}, } @article{32481, author = {{Rakesh Ranga, H.R. and Korobeinichev, O.P. and Harish, A. and Raghavan, Vasudevan and Kumar, A. and Gerasimov, I.E. and Gonchikzhapov, M.B. and Tereshchenko, A.G. and Trubachev, S.A. and Shmakov, A.G.}}, issn = {{1359-4311}}, journal = {{Applied Thermal Engineering}}, keywords = {{Industrial and Manufacturing Engineering, Energy Engineering and Power Technology}}, pages = {{477--491}}, publisher = {{Elsevier BV}}, title = {{{Investigation of the structure and spread rate of flames over PMMA slabs}}}, doi = {{10.1016/j.applthermaleng.2017.11.041}}, volume = {{130}}, year = {{2017}}, } @article{47586, author = {{Lier, Stefan and Riese, Julia and Cvetanoska, Gordana and Lesniak, Anna Katharina and Müller, Stephan and Paul, Sarah and Sengen, Laura and Grünewald, Marcus}}, issn = {{0255-2701}}, journal = {{Chemical Engineering and Processing - Process Intensification}}, keywords = {{Industrial and Manufacturing Engineering, Process Chemistry and Technology, Energy Engineering and Power Technology, General Chemical Engineering, General Chemistry}}, pages = {{111--125}}, publisher = {{Elsevier BV}}, title = {{{Innovative scaling strategies for a fast development of apparatuses by modular process engineering}}}, doi = {{10.1016/j.cep.2017.10.026}}, volume = {{123}}, year = {{2017}}, } @article{39470, author = {{Kleine, A. and Hilleringmann, Ulrich}}, issn = {{2172-038X}}, journal = {{Renewable Energy and Power Quality Journal}}, keywords = {{Electrical and Electronic Engineering, Energy Engineering and Power Technology, Renewable Energy, Sustainability and the Environment}}, pages = {{102--107}}, publisher = {{AEDERMACP (European Association for the Development of Renewable Energies and Power Quality)}}, title = {{{Surface Cleaning and Modification by High Intense UV-Irradition for TiO2 Nanoparticle Films in Dye Sensitized Solar Cells}}}, doi = {{10.24084/repqj14.238}}, year = {{2017}}, }