Results 1 to 10 of about 221,261 (114)

How to Manage Atrial Fibrillation in the Emergency Department: a Critical Appraisal

Journal of Cardiac Arrhythmias, 2020
Atrial fibrillation is the most common cardiac arrhythmia in emergency departments. There is growing evidence that certain patients with acute atrial fibrillation can be safely managed in the emergency room without the need for hospitalization ...
Rafael Thiesen Magliari, José Nunes de Alencar Neto   +1 more
doaj   +7 more sources

Strategy optimization of emergency frequency control based on new load with time delay characteristics

Frontiers in Energy Research, 2023
With the development of modern communication technology and the large number of new controllable loads connected to the power grid, the new controllable loads with flexible regulation characteristics can participate in the emergency frequency stability ...
Lixia Sun, Yiyun Tian, Yichao Wu, Wenzhe Huang, Chenhui Yan, Yuqing Jin   +5 more
doaj   +1 more source

Emergency frequency control strategy of distribution system based on the coordination of multi-resource

Frontiers in Energy Research, 2023
Introduction: The urban distribution system plays a crucial role in efficient power distribution within urban areas. The increasing frequency and intensity of extreme events in recent years pose significant challenges to the reliable operation of urban ...
Zeyuan Shen, Chao Wang, Yao Wang, Haibo Zhao, Zhong Wu, Ende Hu   +5 more
doaj   +1 more source

Hierarchical frequency control strategy of doubly-fed induction diesel generator under emergency condition

Energy Reports, 2022
Natural disasters lead to the uncertain topological structure of the urban distribution network. It is difficult for the communication system to recover quickly, which brings great difficulties to restoring the power supply.
Zhichao Liu, Junlin Li, Chengxiong Mao, Dan Wang, Zhitao Guan, Cong Xie, Jingqi Li, Yuanzhuo Qi   +7 more
doaj   +1 more source

Research on fast response criterion of power grid distributed loads after HVDC block fault

IET Generation, Transmission & Distribution, 2020
The system equivalent inertia of the power grid is gradually decreased with the increasing penetration of renewable energy resources, which leads to a higher risk of frequency fluctuation after a major fault.
Yuling Wang, Wannan Zhang, Haishun Sun, Yingmeng Xiang, Di Shi, Zhiwei Wang   +5 more
doaj   +1 more source

Comparative Analysis of Stability Control Strategy from Grid-connected to Island Operation Based on VSC-HVDC System

Journal of Harbin University of Science and Technology, 2021
The frequency stability problem and frequency transient characteristics of the system under the island operation mode formed by AC tie-line N-2 faults are analyzed after the power grid is evolved into an asynchronous interconnection using VSC-HVDC.
CHEN Qi-chao, LI Hui, LIU Jian-qin, WANG Fei, MENG Jing-wei   +4 more
doaj   +1 more source

Design of emergency speed regulation system of coal mine moter

Gong-kuang zidonghua, 2016
In view of problem that it is difficult to recover normal operation in a short time when frequency converter fails, emergency speed regulation system of coal mine moter was designed.
RUAN Wentao
doaj   +1 more source

An adaptive under-frequency optimal control strategy for power system combined pumped storage and under-frequency load shedding.

PLoS ONE, 2021
With the construction and development of ultra-high voltage (UHV) power grids, large-scale, long-distance power transmission has become common. A failure of the connecting line between the sending-end power grid and the receiving-end power grid will ...
Wentao Huang, Jinman Yu, Zhijun Yuan, Zhongwei He, Jun He, Minghui Deng   +5 more
doaj   +2 more sources

Frequency Stability of Power System with Large Share of Wind Power Under Storm Conditions

Journal of Modern Power Systems and Clean Energy, 2020
The operation of transmission systems with large share of wind power is specially challenging under storm conditions. Under the stormy wind speed conditions, wind turbine protection system is designed to shut down the turbine to avoid excessive ...
Kaushik Das, Feng Guo, Edgar Nuno, Nicolaos A. Cutululis   +3 more
doaj   +1 more source

Coordination of Multiple Flexible Resources Considering Virtual Power Plants and Emergency Frequency Control

Applied Sciences, 2023
High-voltage direct current (HVDC) blocking disturbance leads to large power losses in the receiving-end power grid, and the event-driven emergency frequency control (EFC) is an important measure to prevent large frequency deviation.
Jingrun Xue, Yongji Cao, Xiaohan Shi, Zhen Zhang, Ruicong Ma, Jian Zhang   +5 more
doaj   +1 more source