Results 11 to 20 of about 132,272 (225)

Frequency Modulation and Rotor Speed Recovery Strategy of Doubly-Fed Induction Generator Based on Model Predictive Control

Zhongguo dianli, 2023
The doubly-fed induction generator (DFIG) can participate in the system frequency modulation by releasing the kinetic energy stored in the rotor, but it may cause a secondary frequency drop when the speed is recovered, which is adverse to the frequency ...
Jingjing ZHAO, Ming DU, Shuai LIU, Zibo LI, Wenhe MA   +4 more
doaj   +1 more source

Cooperative Synthetic Inertia Control for Wind Farms Considering Frequency Regulation Capability

Frontiers in Energy Research, 2021
To fully utilize the frequency regulation (FR) capability of wind turbines (WTs) and to avoid a secondary frequency drop caused by the rotor speed recovery, this paper firstly proposes an FR capability evaluation method for wind farms based on the ...
Qiaoming Shi, Lei Liu, Yongping Wang, Yu Lu, Qiang Zou, Qingwu Zhang, Hongqing Liu   +6 more
doaj   +1 more source

Optimal Virtual Inertial-Based Power System Frequency Regulation Through Multi-Cluster Wind Turbines Using BWOA

Frontiers in Energy Research, 2022
Large-scale wind power connected to the grid efficiently reduces fossil fuel consumption, but extremely decreases grid inertial and increases frequency regulation pressure on the grid.
Chao Liu, Chao Liu, Qingquan Li, Xinshou Tian, Changgang Li   +4 more
doaj   +1 more source

Adaptive droop control strategy for wind turbines based on ROCOF and rotor kinetic energy

电力工程技术, 2023
The frequency stability of the wind power grid-connected system may be improved by the participation of wind turbines in frequency regulation. However, it is difficult for the existing droop control to coordinate the frequency response characteristics ...
LIU Hui, LUO Wei, SU Yi, ZHAO Teyang
doaj   +1 more source

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

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

Nucleus Drop or Intraocular Lens Drop Underwent Pars Plana Vitrectomy due to Complication of Cataract Surgery

IJRETINA (International Journal of Retina), 2019
Background: The incidence of nucleus drop or intraocular lens (IOL) drop as the complication of phacoemulsification increases due to the increased frequency of phacoemulsification.
Noviana Kurniasari Vivin, Ari Djatikusumo, Elvioza Elvioza, Gitalisa Andayani, Anggun Rama Yudantha, Mario Marbungaran Hutapea, Andi Arus Victor   +6 more
doaj   +1 more source

Stability Enhancement and Direct Speed Control of DFIG Inertia Emulation Control Strategy

IEEE Access, 2019
With the increasing penetration of renewable energy generators in power grid, traditional vector control (VC) strategy for double fed induction generator (DFIG) is unable to provide extra active power support to grid because DFIG inertia is made ...
Haoshu Shao, Xu Cai, Zheng Li, Dangsheng Zhou, Sujuan Sun, Liang Guo, Yunfeng Cao, Fangquan Rao   +7 more
doaj   +1 more source

Effect of Lower Limb vs. Abdominal Compression on Mobility in Orthostatic Hypotension: A Single-Blinded, Randomized, Controlled, Cross-Over Pilot Study in Parkinson’s Disease

Journal of Parkinson’s Disease, 2022
Background: Orthostatic hypotension (OH) in Parkinson’s disease (PD) is frequent and associated with impairments in quality of life and reduced activities of daily living.
Steffen Paschen, Clint Hansen, Julius Welzel, Judith Albrecht, Arash Atrsaei, Kamiar Aminian, Kirsten E. Zeuner, Robbin Romijnders, Elke Warmerdam, Paul Peter Urban, Daniela Berg, Walter Maetzler   +11 more
doaj   +1 more source

Dynamic power-based temporary frequency support scheme for a wind farm

Frontiers in Energy Research, 2022
Doubly fed induction generators can participate in frequency support following a disturbance by releasing their rotational energies. However, when regaining the rotor speed, a secondary frequency dip (SFD) tends to produce a sudden output drop.
Jiahan You, Dan Xu, Jiangdong Cao
doaj   +1 more source