A5052212423- HVDC Systems and Fault Protection
- Superconducting Materials and Applications
- Physics of Superconductivity and Magnetism
- High-Voltage Power Transmission Systems
- Thermal Analysis in Power Transmission
- Real-time simulation and control systems
- Electric Motor Design and Analysis
- Microgrid Control and Optimization
- Frequency Control in Power Systems
- Particle accelerators and beam dynamics
- Superconductivity in MgB2 and Alloys
- Neutrino Physics Research
- Spacecraft and Cryogenic Technologies
- Magnetic confinement fusion research
- Astrophysics and Cosmic Phenomena
- Electrical Fault Detection and Protection
- Power System Optimization and Stability
- Advanced Aircraft Design and Technologies
- Particle physics theoretical and experimental studies
- Railway Systems and Energy Efficiency
- Power Transformer Diagnostics and Insulation
- Particle Accelerators and Free-Electron Lasers
- Physics and Engineering Research Articles
- Cardiac Structural Anomalies and Repair
- Vacuum and Plasma Arcs
Karlsruhe Institute of Technology
2016-2025
National Academy of Engineering
2023
University of California, Berkeley
2023
Siemens (Germany)
2023
Huazhong University of Science and Technology
2020
Institute on Taxation and Economic Policy
2020
Kentucky imaging Technologies (United States)
2013
FZI Research Center for Information Technology
2001-2010
FIZ Karlsruhe – Leibniz Institute for Information Infrastructure
2007-2010
Nexans (Germany)
2005
The application of superconducting fault current limiters (SCFCLs) in power systems is very attractive because SCFCLs offer superior technical performance comparison to conventional devices limit currents. Negligible impedance at normal conditions, fast and effective limitation within the first rise repetitive operation with automatic recovery are main attributes for SCFCLs.
With the compelling evidence for massive neutrinos from recent v-oscillation experiments, one of most fundamental tasks particle physics over next years will be determination absolute mass scale neutrinos. The value v-masses have crucial implications cosmology, astrophysics and physics. We present case a generation tritium β decay experiment to perform high precision direct measurement electron neutrino with sub-eV sensitivity. discuss experimental requirements technical challenges proposed...
The development of superconducting systems for electric power is driven by the promise improved efficiency, smaller size, and reduced weight as compared to existing technologies possibility new applications. Superconducting components can also contribute quality increased system reliability. This paper addresses historical developments technology status four applications: cables, magnetic energy storage (SMES), fault-current limiters, transformers. Today, SMES only fully functional it has...
Abstract Currently, hybrid-electric aircraft are under investigation as one possible solution to reduce the emissions of aviation industry according Flightpath 2050 European Union. To meet drive train's requirements on low mass while aiming for highest efficiency, superconducting technologies regarded a key enabling technology train powers several tens megawatts. Within German nationally funded project TELOS an exemplary mission profile and physical measures 220-passenger used derive...
There is no doubt that superconducting fault current limiters (SFCL) will be used if their technical and economical benefits are high enough. Up to now a number of studies have been carried out show suitable applications SFCL but very few reports published on in existing networks. This paper shows favourable places an urban network up voltage 110 kV, lists calculates the savings. In investigated it was found feeder locations power stations wind generators most for SFCL.
Within the German project CURL 10 a full scale three-phase resistive current limiter was developed and successfully tested up to nominal voltage power (10 kV, MVA). This is today largest HTS world wide. The device based on bifilar coils of MCP-BSCCO 2212 bulk material operates at T=66 K. Per phase 30 components are connected in series order obtain required resistance. electrical stabilization metallic shunt contacted continuously superconductor allows fields 0.6 V/cm. We report development...
In recent years many large scale demonstrators and prototypes of superconducting fault current limiters have been successfully developed tested. Within the European Project ECCOFLOW (www.eccoflow.org), it is first time that a resistive-type limiter for two different locations permanent installation foreseen. The has rating 20 kV 1 kA will be tested in busbar transformer feeder application. paper summarizes conceptual design this innovative reports detail about development super- conducting...
In this paper the German AmpaCity project, which started in September 2011, will be introduced and conceptual design of main components described. The objective project is developing, manufacturing installing a 10 kV, 40 MVA high temperature superconducting (HTS) system consisting fault current limiter 1 km cable city Essen. serves as lighthouse since it first time that one kilometer HTS installed together with an real grid application within center area. addition longest worldwide. Within...
Superconductors have been being applied to a variety of large-scale power applications, including magnets, electric machines, and fault current limiters, because they can enable compact, lightweight high efficiency design. In applications such those mentioned above, superconducting coils are always key component. For example, in machine, the used generate main flux density air gap, which is significantly important for energy conversion. It performance that plays an essential role determining...
High voltage direct current super-grids are one attractive solution for the transmission of bulk power renewable electricity over long distances. Their protection is still an issue and superconducting fault limiters (SCFCL) offer perspectives. However, actual tapes not yet properly designed operation at high voltages (>100 kV): The electric field developed during limitation too low (approximately 50 V/m ms) limiter requires lengths tape. European project FASTGRID aims improving properties...
A full scale three-phase resistive high-Tc superconducting fault current limiter (SCFCL) designed for 10 kV, MVA, has been developed, manufactured, and tested within a publicly funded German project called CURL 10. The device is based on 90 bifilar coils of MCP BSCCO-2212 bulk material. operating temperature 66 K achieved by cooling liquid nitrogen using two Stirling cryocoolers. Until today, this the largest HTS world wide. We report design features, composition, operation parameters SCFCL...
A new German government funded project for a resistive fault current limiter has started in September 2009 (ENSYSTROB) and is presented. The consortium includes partners from industry, research centers utilities. It aims the construction of 3-phase medium voltage (12 kV, 800 A) protection domestic supply power plant. special feature this application presence large in-rush currents (4100 Ap 50 ms, 1800 15 s). superconducting components are bifilar pancake coils consisting pairs YBCO-tapes...
In this paper the German AmpaCity project, which started in September 2011, will be introduced and conceptual design of main components described. The objective project is developing, manufacturing installing a 10 kV, 40 MVA high temperature superconducting (HTS) system consisting fault current limiter 1 km cable city Essen. serves as lighthouse since it first time that one kilometer HTS installed together with an real grid application within center area. addition longest worldwide. Within...
In recent years significant progress has been made in the development of high temperature superconducting (HTS) power devices, particular cables and fault current limiters. Several field tests large scale prototypes for both applications have successfully accomplished technologies are getting closer to commercialization. this paper German AmpaCity project will be introduced its objectives described. Furthermore, conceptual design HTS cable system major developments which achieved so far, as...
This paper discusses the design, set-up and short-circuit testing of an air coil superconducting fault current limiter demonstrator. The demonstrator was specified for 60 kVA, 400 V, z = 6%. It consists a primary winding made copper, which is basically equivalent core reactor secondary commercially available (RE)BCO tapes, are individually short-circuited. Both windings inductively coupled intended to work in liquid nitrogen. measurements results show significantly lower impedance during...
Abstract Previous studies of test coils have demonstrated the high thermal and electrical stability no-insulation (NI) temperature superconducting (HTS) thanks to presence turn-to-turn current paths. These paths in a NI coil are significantly influenced by contact resistivity. In practice, it is very challenging measure resistivity direct experiments short samples, since tapes surface roughness tolerance, stress, etc. A proper simulation model needed investigate with dedicated experiments....
The KATRIN experiment will probe the neutrino mass by measuring β-electron energy spectrum near endpoint of tritium β-decay. An integral analysis be performed an electro-static spectrometer (``Main Spectrometer''), ultra-high vacuum vessel with a length 23.2 m, volume 1240 m3, and complex inner electrode system about 120 000 individual parts. strong magnetic field that guides β-electrons is provided super-conducting solenoids at both ends spectrometer. Its influence on turbo-molecular pumps...
Low-inertia power systems suffer from a high rate of change frequency (ROCOF) during sudden imbalance in supply and demand. Inertia emulation techniques using storage systems, such as flywheel energy (FESSs), can help to reduce the ROCOF by rapidly providing needed balance grid. In this work, new adaptive controller for inertia high-speed FESS is proposed. The damping coefficients vary combination bang–bang control approaches self-adaptive ones, simultaneously improve both nadir. performance...
Four different cooling options for three-phase concentric medium-voltage HTS cables have been investigated. These four differ in the feed-in and return of liquid nitrogen utilization or nonutilization an annular gap are so determining whole cable design. Simulations pressure drops temperature profiles carried out to evaluate construction limits efficiency each The simulation results provide maximum transmission lengths minimal diameters a given power defined operation range. indicate that...
Abstract Advances in superconductor technology make the prospect of economical operation high temperature superconducting (HTS) power cables a practical concept for grid applications urban centers. With more advanced cable designs being developed and commercialized, their geometrical features dynamic behavior are becoming increasingly complicated to be modeled. This brings new challenges as complex structure HTS significantly increases computation needed perform simulations. In this paper we...
Low-inertia power systems with a high share of renewables can suffer from fast frequency deviations during disturbances. Fast-reacting energy storage such as Flywheel Energy Storage System (FESS) help limit the by injecting or absorbing amounts active power, almost no degradation concerns. But for an accurate evaluation benefits using FESS in systems, and validated model is necessary, which not only reflects its advantages, but also shows practical limitations this technology, losses,...
This article presents a theoretical investigation of resistive superconducting fault current limiter (R-SFCL) operating in medium-voltage network. The considered power system high level as well transient recovery voltage. simulation result shows that the R-SFCL not only limits to desirable value, but also improves voltage circuit breakers by eliminating high-order harmonics generated opening breaker.
A hybrid Energy Storage Systems (ESS) consists of two or more energy storage technologies, with different power and characteristics. Using a ESS, both high-frequency low-frequency variations can be addressed at the same time. For an accurate sizing use high-resolution data is required. However, over long periods leads to large sets, which are difficult handle. In this paper, improved motif discovery algorithm introduced find most recurring daily consumption patterns within time series...