Results 31 to 40 of about 2,952,202 (230)

Experimental Study of a Reference Model Vertical-Axis Cross-Flow Turbine. [PDF]

PLoS ONE, 2016
The mechanical power, total rotor drag, and near-wake velocity of a 1:6 scale model (1.075 m diameter) of the US Department of Energy's Reference Model vertical-axis cross-flow turbine were measured experimentally in a towing tank, to provide a ...
Peter Bachant, Martin Wosnik, Budi Gunawan, Vincent S Neary   +3 more
doaj   +1 more source

Inertia and Droop Frequency Control Strategy of Doubly-Fed Induction Generator Based on Rotor Kinetic Energy and Supercapacitor

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

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, HUANG Zuo-dong, DING Zai-ran, SHI Yi, JIAO Lei, LENG Jian-xing   +5 more
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, Saramak Daniel, MŁynarczykowska Anna   +2 more
doaj   +2 more sources

Model Development and Stability Analysis for a Turbocharger Rotor System under Multi-Field Coupled Forces [PDF]

Automotive turbochargers have been widely applied in vehicles in order to increase the power output of internal combustion engines by increasing the air to fuel ratio entering the piston cylinders.
Zhang, Hao
core   +3 more sources

Two-stage frequency regulation for wind turbines with adaptive coefficients and optimized power trajectory

International Journal of Electrical Power & Energy Systems
Wind 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, Hui Li, Jie Zheng, Hongtao Tan, Xuewei Xiang, Ran Yao   +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

Detection and Diagnosis of Broken Rotor Bar Based on the Analysis of Signals from a Variable Speed Drive [PDF]

In this paper, the diagnosis of broken rotor bar (BRB) is investigated analytically and experimentally based on induction motors (IM) with variable speed drives (VSD).
Gu, Fengshou, Ball, Andrew, Lane, Mark, Ashari, Djoni   +3 more
core   +3 more sources

Two-Stage Frequency Response Strategy for DFIGs Based on Adaptive Speed–Frequency Coordinated Optimization

Energies
Doubly fed induction generators (DFIGs) may suffer from excessive rotor deceleration during frequency support and secondary frequency drop (SFD) during rotor speed recovery.
Ziya Sun, Xinwei Dong, Haiyong Chen, Yuming Liao, Hua Li, Yue Jiang, Lei Yang   +6 more
doaj   +1 more source