456 Hits in 4.5 sec

Harmonic Stability in Power Electronic Based Power Systems: Concept, Modeling, and Analysis

Xiongfei Wang, Frede Blaabjerg
2018 IEEE Transactions on Smart Grid  
Since 2009, he has been with Aalborg University, where he is currently an Associate Professor with the Department of Energy Technology.  ...  Index Terms-Harmonic stability, damping, power electronics, power systems, resonance.  ...  The other case is the negative damping added above the Nyquist frequency by the ACC loop with the reduced time delay [15] , and the negative damping may destabilize the LC resonance frequency above the  ... 
doi:10.1109/tsg.2018.2812712 fatcat:n6sn6qxolnca5ejsmnfalm2si4

Harmonic transfer functions based controllers for linear time-periodic systems

Elvan Kuzucu Hidir, Ismail Uyanik, Ömer Morgül
2018 Transactions of the Institute of Measurement and Control  
On the other hand, there are also some studies that focus on data-driven identification of LTP systems with unknown state-space formulations.  ...  We propose a new methodology to design P-, PD-and PIDtype controllers for LTP systems using Nyquist diagrams and the eigenlocus of the HTFs.  ...  Research Council of Turkey (TÜ BITAK) granted to Elvan Kuzucu.  ... 
doi:10.1177/0142331218778748 fatcat:5p3cx6tq3jectmnaykrmdxepxa

Utilizing the cochlea as a bio-inspired compressive sensing technique

C A Peckens, J P Lynch
2013 Smart materials and structures (Print)  
The nervous system is capable of real-time processing and data transmission of external stimuli through an extremely condensed format with very basic processing units.  ...  However, a number of performance bottlenecks remain including challenges with cost-effectively scaling monitoring systems up to large nodal counts.  ...  The authors would like to express deep gratitude to Mr Sean O'Connor and Professor Anna Gilbert for their insight and assistance with compressive sensing methods.  ... 
doi:10.1088/0964-1726/22/10/105027 fatcat:r5azeekunfdnpk47vqdzk7fnya

Analysis and Mitigation of Harmonic Resonances in Multi–Parallel Grid–Connected Inverters: A Review

Ramy Ali, Terence O'Donnell
2022 Energies  
The concepts are illustrated by means of an example case of multiple inverters operating in a low voltage distribution system.  ...  With the move towards decarbonization of the energy system and increased use of renewable generation, the number of power electronics converter interfaced resources connecting to the grid is growing.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/en15155438 fatcat:adzxz7iumfh73ioecpkcioppmy

Amplitude modulation in δ Sct stars: statistics from an ensemble study ofKeplertargets

Dominic M. Bowman, Donald W. Kurtz, Michel Breger, Simon J. Murphy, Daniel L. Holdsworth
2016 Monthly notices of the Royal Astronomical Society  
We analyse and discuss examples of δ Sct stars with constant amplitudes and phases; those that exhibit amplitude modulation caused by beating of close-frequency pulsation modes; those that exhibit pure  ...  amplitude modulation (with no associated phase variation); those that exhibit phase modulation caused by binarity; and those that exhibit amplitude modulation caused by nonlinearity.  ...  AC K N OW L E D G E M E N T S We thank the anonymous reviewer for their feedback that improved this paper. We also thank professor Hideyuki Saio for useful discussions.  ... 
doi:10.1093/mnras/stw1153 fatcat:jyb65hcndnfodammr65aruu5au

Design Space Optimization of a Three-Phase LCL Filter for Electric Vehicle Ultra-Fast Battery Charging

Davide Cittanti, Fabio Mandrile, Matteo Gregorio, Radu Bojoi
2021 Energies  
In particular, the grid-side filter, which ensures sinusoidal current absorption with low pulse-width modulation (PWM) harmonic content, can be a major contributor to the overall converter size and losses  ...  Moreover, separate tests are performed with different values of grid inner impedance, verifying the converter control stability in various operating conditions and supporting the general validity of the  ...  The digital sampling and update process is performed once per switching period ( f s = f sw = 20 kHz), however the current feedback values are obtained by means of oversampling (32 samples per switching  ... 
doi:10.3390/en14051303 fatcat:zmoz2mps25g7jni4oq5j3uongy

High-performance speed estimation ofinduction machines based on adaptivefiltering

Ivan Petric, Slobodan Vukosavic
2019 IET electric power applications  
The capability of using the estimated signal as speed feedback in a sensorless drive is tested and confirmed.  ...  The estimator structure is proposed, for extracting and tracking the RSH found in the stator line current, which offers improved results compared with previously published methods.  ...  The maximal theoretical speed is determined by the sampling frequency, according to the Nyquist-Shannon theorem.  ... 
doi:10.1049/iet-epa.2019.0609 fatcat:p7ko3jmoozakdgrdesa2gjqc74

Model cerebellar granule cells can faithfully transmit modulated firing rate signals

Christian Rössert, Sergio Solinas, Egidio D'Angelo, Paul Dean, John Porrill
2014 Frontiers in Cellular Neuroscience  
inhibitory feedback (open-loop mode).  ...  utilized, especially in combination with push-pull coding.  ...  ACKNOWLEDGMENTS This work was supported by a grant from the European Union (REALNET, 270434 FP7) and a grant from the Italian Ministry of Health (GR-2009-143804).  ... 
doi:10.3389/fncel.2014.00304 pmid:25352777 pmcid:PMC4195316 fatcat:czdofdtkyfbsfbgdb3lnwne4ji

Extremum Seeking Tuning for Reel Tension Control in Haptic Application

Martin J.-D. Otis, Thien-Ly Nguyen-Dang, Denis Laurendeau, Clément Gosselin, Lotfi Beji, Samir Otmane, Azgal Abichou
2009 AIP Conference Proceedings  
Such a system is usually controlled sub-optimally due to the complexity of its model.  ...  The solution of this optimization gives a direct measure of the reel dynamic transparency evaluated by the proposed cost function.  ...  | = γ 2(1 − cos ω) , (19) with a null response at exactly the Nyquist frequency.  ... 
doi:10.1063/1.3106485 fatcat:kahyhiph3zhb3nn64saphvdvie

A digital feedback system for advanced ion manipulation techniques in Penning traps

Jost Herkenhoff, Menno Door, Pavel Filianin, Wenjia Huang, Kathrin Kromer, Daniel Lange, Rima X. Schüssler, Christoph Schweiger, Sergey Eliseev, Klaus Blaum
2021 Review of Scientific Instruments  
The possibility of applying active feedback to a single ion in a Penning trap using a fully digital system is demonstrated.  ...  feedback parameters.  ...  It can be found that the application of feedback with a phase of 0 ○ or 180 ○ can be used to arbitrarily modify the damping of the ion, γ fb = γ(1 − Re{G}). (5) This opens up the possibility of achieving  ... 
doi:10.1063/5.0064369 pmid:34717400 fatcat:f6ijxtycmvhzdnswld5f2jzoqe

2021 Index IEEE Transactions on Circuits and Systems II: Express Briefs Vol. 68

2021 IEEE Transactions on Circuits and Systems - II - Express Briefs  
The primary entry includes the coauthors' names, the title of the paper or other item, and its location, specified by the publication abbreviation, year, month, and inclusive pagination.  ...  ., +, TCSII Jan. 2021 381-385 Parameters Measurement of Multiple Exponentially Damped Sinusoids With Sub-Nyquist Sampling.  ...  Yang, S.Y., +, TCSII July 2021 2404-2408 Parameters Measurement of Multiple Exponentially Damped Sinusoids With Sub-Nyquist Sampling.  ... 
doi:10.1109/tcsii.2022.3144928 fatcat:bm53w7gva5bthholfhhiq4yg3a

A Digital Feedback System for Advanced Ion Manipulation Techniques in Penning Traps [article]

Jost Herkenhoff, Menno Door, Pavel Filianin, Wenjia Huang, Kathrin Kromer, Daniel Lange, Rima X. Schüssler, Christoph Schweiger, Sergey Eliseev, Klaus Blaum
2021 arXiv   pre-print
The use of FPGA technology allowed the implementation of a fully-featured data acquisition system, making it possible to realize feedback techniques that require constant monitoring of the ion signal.  ...  The system's capabilities were demonstrated by applying feedback to the ion detection system primarily consisting of a resonant circuit.  ...  • ferred using multiple cycles with varying phase evolution times.  ... 
arXiv:2110.01404v1 fatcat:2sy6m6cljzgqfaxbuwckvg5bmu

Active noise control

S.J. Elliott, P.A. Nelson
1993 IEEE Signal Processing Magazine  
by a sinusoidal reference signal with four samples/cycle and a four-sample delay in the secondary path.  ...  The feedback control architecture illustrated in Fig. 7c can be readily extended to plants with multiple inputs and multiple outputs.  ... 
doi:10.1109/79.248551 fatcat:5dzcrcq5zzdfdcxgrhudxtlvg4

Performance Oriented DSP for Flexible Long Haul Coherent Transmission

Mehdi Torbatian, Domanic Lavery, Mohammad Osman, Demin Yao, David Millar, Yuliang Gao, Aditya Kakkar, Ziad Elsahn, Clayton Doggart, Ahmed Morra, Nashat Abughalieh, Shijun Yang (+5 others)
2021 Journal of Lightwave Technology  
In long haul optical fiber communication networks, which can span thousands of kilometers, bandwidth is at a premium due to the relatively low availability of optical fibers when compared with network  ...  Therefore, these networks require the highest performance in the physical layer, with transceivers that are capable of extracting all the available capacity from each optical fiber.  ...  Citation information: DOI 10.1109/JLT.2021.3134155, Journal of Lightwave Technology  ... 
doi:10.1109/jlt.2021.3134155 fatcat:hq65xpf6zbajdbmuzdmlfmmkz4

Adapting a Cryogenic Sapphire Oscillator for Very Long Baseline Interferometry

Sheperd Doeleman, Tao Mai, Alan E. E. Rogers, John G. Hartnett, Michael E. Tobar, Nitin Nand
2011 Publications of the Astronomical Society of the Pacific  
Hydrogen masers have traditionally been used as VLBI references, but atmospheric turbulence typically limits (sub) millimeter VLBI coherence times to ~1-30 s.  ...  of astrophysical phenomena.  ...  With Nyquist sampling at two bits, the aggregate data rate for a single polarization was 1 Gbit s À1 . At GGAO, a hydrogen maser provided the frequency reference for all VLBI instrumentation.  ... 
doi:10.1086/660156 fatcat:ag4g3ewpirggjbpkz3dkqhbote
« Previous Showing results 1 — 15 out of 456 results