Results 11 to 20 of about 14,434,014 (273)

Fast frequency response for effective frequency control in power systems with low inertia

open access: yesThe Journal of Engineering, 2019
The increasing penetration of renewable generation has led to the decrease of power systems’ overall inertia, which introduces significant challenges to frequency stability.
Qiteng Hong   +8 more
doaj   +2 more sources

Placement and Implementation of Grid-Forming and Grid-Following Virtual Inertia and Fast Frequency Response [PDF]

open access: yesIEEE Transactions on Power Systems, 2018
The electric power system is witnessing a shift in the technology of generation. Conventional thermal generation based on synchronous machines is gradually being replaced by power electronics interfaced renewable generation.
B. Poolla, Dominic Gross, F. Dörfler
semanticscholar   +1 more source

Fast Frequency Response From Energy Storage Systems—A Review of Grid Standards, Projects and Technical Issues

open access: yesIEEE Transactions on Smart Grid, 2020
Electric power systems foresee challenges in stability due to the high penetration of power electronics interfaced renewable energy sources. The value of energy storage systems (ESS) to provide fast frequency response has been more and more recognized ...
L. Meng   +6 more
semanticscholar   +1 more source

Optimal Portfolio of Distinct Frequency Response Services in Low-Inertia Systems [PDF]

open access: yesIEEE Transactions on Power Systems, 2019
A reduced level of system inertia due to renewable integration increases the need for cost-effective provision of ancillary services, such as Frequency Response (FR).
Luis Badesa, Fei Teng, G. Strbac
semanticscholar   +1 more source

Sound Scattering Layers Within and Beyond the Seychelles-Chagos Thermocline Ridge in the Southwest Indian Ocean

open access: yesFrontiers in Marine Science, 2021
In global oceans, ubiquitous and persistent sound scattering layers (SL) are frequently detected with echosounders. The southwest Indian Ocean has a unique feature, a region of significant upwelling known as the Seychelles-Chagos Thermocline Ridge (SCTR),
Myounghee Kang   +8 more
doaj   +1 more source

Dynamics of a mechanical system with nonlinear elastic suspension and spectral analysis of the results [PDF]

open access: yesОмский научный вестник, 2023
The article considers the dynamics of a nonlinear mechanical system under the action of a kinematic perturbation on it. The object's vibration isolation system is described by a rigid cubic power characteristic and is based on compensation of external
V. A. Nekhaev   +3 more
doaj   +1 more source

Comparative Assessment of Tactics to Improve Primary Frequency Response Without Curtailing Solar Output in High Photovoltaic Interconnection Grids

open access: yesIEEE Transactions on Sustainable Energy, 2019
Power grid primary frequency response will be significantly impaired by photovoltaic (PV) penetration increase because of the decrease in inertia and governor response.
Shutang You   +6 more
semanticscholar   +1 more source

Black-Start Capability of DFIG Wind Turbines Through a Grid-Forming Control Based on the Rotor Flux Orientation

open access: yesIEEE Access, 2021
The increasing penetration of renewable energies in the power system is demanding new services from wind farms. In particular, system operators are concerned about system restoration after a black-out and new grid codes are under consideration that ...
Jose Luis Rodriguez-Amenedo   +3 more
doaj   +1 more source

Mode identification by eigensystem realization algorithm through virtual frequency response function

open access: yesStructural Control & Health Monitoring, 2019
Mode identification in civil engineering uses ambient excitation response, where the excitation is assumed to be stationary white noise. However, practical engineering conditions cannot satisfy this assumption of ideal excitation.
C. Qu, T. Yi, Hongnan Li
semanticscholar   +1 more source

Evidence of a third kind of Johnscher’s like universal dielectric response [PDF]

open access: yesJournal of Advanced Dielectrics, 2018
Polymer/metal composites (PMC) comprising of polyvinylidene fluoride/nanocrystalline nickel with varying volume fractions of nickel (fcon) prepared under cold press show an insulator to metal transition (IMT) at percolation threshold (fc=fcon=0.27).
Maheswar Panda
doaj   +1 more source

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