Results 61 to 70 of about 3,762,663 (201)

Small-Signal Stability Analysis of Photovoltaic-Hydro Integrated Systems on Ultra-Low Frequency Oscillation

Energies, 2020
In recent years, ultralow-frequency oscillation has repeatedly occurred in asynchronously connected regional power systems and brought serious threats to the operation of power grids.
Sijia Wang, Xiangyu Wu, Gang Chen, Yin Xu   +3 more
doaj   +1 more source

The 21cm angular-power spectrum from the dark ages [PDF]

, 2007
At redshifts z >~ 30 neutral hydrogen gas absorbs CMB radiation at the 21cm spin-flip frequency. In principle this is observable and a high-precision probe of cosmology.
Anthony Challinor, Antony Lewis, D. Scott, E. T. Vishniac, I. S. Gradshteyn, M. Abramowitz, R. Barkana   +6 more
core   +2 more sources

Small-signal subthreshold model for i.g.f.e.t.s

Electronics Letters, 1976
Theoretical considerations supported by practical measurements indicate that the small-signal low-frequency behaviour of i.g.f.e.t.s, operating with a significant VDS bias and 1 nA < ID < 1?A, can be represented by a simple model.
openaire   +1 more source

Sneutrino-induced like sign dilepton signal with conserved R-parity [PDF]

, 2001
Lepton number violation could be manifest in the sneutrino sector of supersymmetric extensions of the standard model with conserved R-parity. Then sneutrinos decay partly into the ``wrong sign charged lepton'' final state, if kinematically accessible. In
A. Bartl, A. Ghosal, A. Wagner, A. Wagner, C. Weiszäcker, D.E. Groom, E. Byckling, E. Fermi, F. del Aguila, G. Bhattacharyya, G.F. Giudice, G.P. Lepage, H. Baer, H. Dreiner, H. Murayama, H. Terazawa, H. V. Klapdor-Kleingrothaus, H.E. Haber, H.V. Klapdor-Kleingrothaus, I. Ginzburg, I. Ginzburg, J. Ellis, J. Kalinowski, J.S. Hagelin, L. Baudis, L.E. Ibáñez, L.J. Hall, M. Chembtob, M. Hirsch, M. Hirsch, M. Hirsch, M. Hirsch, M. Hirsch, O. Panella, O. Panella, P. Kessler, S. Hesselbach, St. Kolb, St. Kolb, T. Falk, T. Wöhrmann, V. Barger, V. Telnov, Y. Grossman, Y. Grossman   +44 more
core   +2 more sources

Self-Tuning Parameters of the Proposed Fuzzy Immune Integral Controller to Improve the Performance of the Standard P&O-MPPT Strategy

IEEE Access
This paper proposes the automatic parameter tuning of the proposed fuzzy immune controller. It is cascaded with the control employing the perturb and observe (P&O) algorithm, resulting in a new maximum power point tracking (MPPT) strategy, called ...
Ramazan Ayaz
doaj   +1 more source

Production of Gravitational Waves in the nMSSM

, 2008
During a strongly first-order phase transition gravitational waves are produced by bubble collisions and turbulent plasma motion. We analyze the relevant characteristics of the electroweak phase transition in the nMSSM to determine the generated ...
Balazs C, Bodeker D, Caprini C Durrer R Servant G, Cline J M, Cline J M Joyce M Kainulainen K, Corbin V, Danzmann K, Fromme L, Gogoberidze G Kahniashvili T Kosowsky A, Harry G M, Huber S J, Huber S J Konstandin T, Hugonie C, Konstandin T, Kosowsky A Mack A Kahniashvili T, Moore G D, Nicolis A, Stephan J Huber, Thomas Konstandin   +18 more
core   +1 more source

Intrinsic Correlation of Galaxy Shapes: Implications for Weak Lensing Measurements [PDF]

, 2000
Weak gravitational lensing is now established as a powerful method to measure mass fluctuations in the universe. It relies on the measurement of small coherent distortions of the images of background galaxies. Even low-level correlations in the intrinsic
Heavens, Alan, Heymans, Catherine, Refregier, Alexandre   +2 more
core   +2 more sources

Reduced-Order Model for Dynamic Stability Analysis of Single-Phase Islanded Microgrid With BPF-Based Droop Control Scheme

IEEE Access, 2019
By introducing a feedback path in the conventional droop control loop of islanded microgrid, the voltage amplitude and frequency restoration can be effectively achieved by using the secondary control.
Yang Han, Mengling Yang, Ping Yang, Lin Xu, Xu Fang, Ke Zhang, Frede Blaabjerg   +6 more
doaj   +1 more source

Stability analysis of q-axis rotor flux based model reference adaptive system updating rotor time constant in induction motor drives

CES Transactions on Electrical Machines and Systems, 2017
q-axis rotor flux can be chosen to form a model reference adaptive system (MRAS) updating rotor time constant online in induction motor drives. This paper presents a stability analysis of such a system with Popov's hyperstability concept and small-signal
Shuying Yang, Pengpeng Cao, Xing Zhang
doaj   +1 more source

Small-Signal Modeling of PMSG-Based Wind Turbine for Low Voltage Ride-Through and Artificial Intelligent Studies

Energies, 2020
In recent years, due to the several advantages of permanent magnet synchronous generator (PMSG), the number of wind farms utilizing this technology has been significantly grown.
Mojtaba Nasiri, Saleh Mobayen, Behdad Faridpak, Afef Fekih, Arthur Chang   +4 more
doaj   +1 more source