Results 41 to 50 of about 9,739 (121)

Improved Frequency Control Strategy for Offshore Wind Farm Integration via VSC-HVDC

Energies, 2022
Voltage source converter based high voltage DC system (VSC-HVDC) has become a very promising solution to integrate offshore wind farm. However, the equivalent inertia of the modern power system with large renewable energy integration becomes small, which
Rui Zeng, Yizhen Wang
doaj   +1 more source

Performance and Wake Characterization of a Model Hydrokinetic Turbine: The Reference Model 1 (RM1) Dual Rotor Tidal Energy Converter

Energies, 2020
The mechanical power and wake flow field of a 1:40 scale model of the US Department of Energy’s Reference Model 1 (RM1) dual rotor tidal energy converter are characterized in an open-channel flume to evaluate power performance and wake flow recovery. The
Craig Hill, Vincent S. Neary, Michele Guala, Fotis Sotiropoulos   +3 more
doaj   +1 more source

Experimental Investigation of the Use of Expander–Generator Pressure Regulators in Small-Scale Natural Gas Pressure-Reduction Stations

Energies
Natural gas pressure-reduction stations dissipate a significant portion of the gas pressure energy during conventional throttling. The recovery of this energy at small-capacity stations remains challenging due to low gas flow rates and variable operating
Artem Belousov, Vladimir Lushpeev, Anton Sokolov, Artem Zaretskiy, Aleksei Shvets, Radel Sultanbekov, Aliia Sharifullina, Shamil Islamov   +7 more
doaj   +1 more source

DFIG virtual inertia control in micro‐grid based on setting trigger condition and ZN method for parameters optimisation

IET Generation, Transmission & Distribution, 2017
The virtual inertia control (VIC) is used to design frequency regulation for a doubly fed induction generator (DFIG). The VIC method can be improved by adding supplementary control loops for inertia response and rotor speed recovery.
Yang Fu, Lisha Huang, Hengyi Zhang, Yang Mi, Jingjing Zhao, Fangxing Li   +5 more
doaj   +1 more source

Inertia Support Strategy for Wind Turbine Based on Switched Operating Points With Equivalent Time Constant

IEEE Access
The wind Turbine adopts Virtual Synchronous Generator (VSG) control to support grid frequency by releasing their energy reserve. However, the interaction between the maximum power point tracking (MPPT) control and VSG control will weaken their inertia ...
Jin Li, Ting An, Yuehong Zhou, Haiyan Zhao   +3 more
doaj   +1 more source

Analysis of the Impacts of Bearing on Vibration Characteristics of Rotor

Shock and Vibration, 2017
Aiming at a Top Gas Recovery Turbine Unit (TRT) with double support rotor and the extending disk end, theoretical and experimental analysis about influence of cylindrical bearing and four-lobe bearing on vibration of TRT rotor system are conducted in ...
Peiji Yang, Qi Yuan, Chao Huang, Yafeng Zhou, Hongliang Li, Yu Zhou   +5 more
doaj   +1 more source

A study in the recovery method of the directional controllability of single-rotor helicopters under tail-rotor damage conditions by using main-rotor brakes and the dead zone/disturbance simultaneous estimator

Nihon Kikai Gakkai ronbunshu, 2015
This paper describes considerations of the effectiveness about the recovery control of the yaw rate motion of single-rotor helicopters by using both motors (engines) and main-rotor brakes in autorotation flight under tail-rotor damage conditions.
Daigo FUJIWARA
doaj   +1 more source

A Coordinated Wind-Storage Primary Frequency Regulation Strategy Accounting for Wind-Turbine Rotor Kinetic Energy Recovery

Energies
To improve the dynamic response and steady-state frequency quality of a wind–storage coordinated system during primary frequency regulation, and to address the secondary frequency dip caused by rotor kinetic energy recovery when a doubly fed induction ...
Xuenan Zhao, Hao Hu, Guozheng Shang, Pengyu Zhao, Wenjing Dong, Zongnan Liu, Hongzhi Zhang, Yu Song   +7 more
doaj   +1 more source

Wake Analysis of Wind Turbine Based on Scanning Images from Doppler Lidar

南方能源建设
[Objective] To fully explore the data value of lidar in wind turbine wake observation, conduct an in-depth study on the three-dimensional (3D) wake structure and wind speed attenuation characteristics in wake zone, and further provide references for ...
Yanfeng CAI, Fareng YAO, Jiyan WANG
doaj   +1 more source

Segmented Gurney Flaps for Improved Wind Turbine Wake Recovery

Wind Energy
When wind passes through the rotor of a wind turbine, the velocity is decreased while turbulence is increased. The region of decreased wind speed behind the rotor is known as the wind turbine wake and is bounded by a complex structure of helical vortices.
Nirav Dangi, Koen Boorsma, Edwin Bot, Wim Bierbooms, Wei Yu   +4 more
doaj   +1 more source