Results 21 to 30 of about 9,739 (121)
Energies, 2020 The large-scale application of wind power eases the shortage of conventional energy, but it also brings great hidden danger to the stability and security of the power grid because wind power has no ability for frequency regulation.
Xiangwu Yan, Xuewei Sun
doaj +1 more source
Recovery processes in a large offshore wind farm [PDF]
Wind Energy Science, 2021 Wind turbines in a wind farm extract energy from the atmospheric flow and convert it into electricity, resulting in a localized momentum deficit in the wake that reduces energy availability for downwind turbines.
T. Gupta, S. Baidya Roy
doaj +1 more source
Evaluation of flotation process course on the example of sulphide ores [PDF]
E3S Web of Conferences, 2017 The article concerns investigations over the influence of selected parameters of the flotation process course on the values of technological indices of beneficiation process assessment.
Oleksik Konrad +2 more
doaj +2 more sources
Research on Rotational Resistance Moment of Rotary Energy Recovery Device
E3S Web of Conferences, 2018 The effects of operational conditions on the resistance moment of a rotary energy recovery device have been systematically investigated through the computational fluid dynamics in this paper.
GUO Ang +5 more
doaj +1 more source
Torque Limit-Based Inertial Control of a DFIG for Rapid Frequency Stabilization
Frontiers in Energy Research, 2021 With the increasing penetration of renewable energy generation, the frequency stability of a power grid can be significantly threatened. A doubly-fed induction generator (DFIG) participates in the frequency support of a power grid by releasing kinetic ...
Yien Xu, Hongmei Wang
doaj +1 more source
International Journal of Electrical Power & Energy SystemsWind turbines support grid frequency by rotor decelerating and then accelerating, but the instant power imbalance caused by rotor speed recovery may lead to a secondary frequency drop.
Zhiting Zhou +5 more
doaj +1 more source
Power curve and wake analyses of the Vestas multi-rotor demonstrator [PDF]
Wind Energy Science, 2019 Numerical simulations of the Vestas multi-rotor demonstrator (4R-V29) are compared with field measurements of power performance and remote sensing measurements of the wake deficit from a short-range WindScanner lidar system.
M. P. van der Laan +11 more
doaj +1 more source
A rotational speed recovery strategy for wind turbines considering secondary frequency drops
Zhejiang dianliWind turbines can contribute to frequency regulation by releasing rotor kinetic energy， which is an effective way to ensure frequency stability in power systems with high wind power penetration.
LYU Zhenhua +4 more
doaj +1 more source
Observations of the Growth and Decay of Stall Cells during Stall and Surge in an Axial Compressor
International Journal of Rotating Machinery, 2017 This research investigated unsteady events such as stall inception, stall-cell development, and surge. Stall is characterized by a decrease in overall pressure rise and nonaxisymmetric throughflow.
Adam R. Hickman, Scott C. Morris
doaj +1 more source
Numerical Analysis of the Dynamic Interaction between Two Closely Spaced Vertical-Axis Wind Turbines
Energies, 2021 To investigate the optimum layouts of small vertical-axis wind turbines, a two-dimensional analysis of dynamic fluid body interaction is performed via computational fluid dynamics for a rotor pair in various configurations.
Yutaka Hara +3 more
doaj +1 more source