Results 1 to 10 of about 67,365 (201)

Design and analysis of virtual impedance control scheme based on MESOGI for improving harmonic sharing of nonlinear loads [PDF]

Scientific Reports
Under the presence of nonlinear load, the most existing virtual impedance (VI) methods-based control solution performs poorly in reactive power sharing among droop-operated VSIs in microgrids (MGs).
Abdelhammid Kherbachi, Ahmed Bendib, Aissa Chouder, Hafiz Ahmed, Mohamed Benbouzid, Saad Motahhir   +5 more
doaj   +2 more sources

Microfluidic impedance flow cytometer leveraging virtual constriction microchannel and its application in leukocyte differential [PDF]

Microsystems & Nanoengineering
Microfluidic impedance flow cytometry has been widely used in leukocyte differential and counting, but it faces a bottleneck due to the trade-off between impedance detection throughput and sensitivity.
Minruihong Wang, Jie Zhang, Xiao Chen, Yimin Li, Xukun Huang, Junbo Wang, Yueying Li, Xiaoye Huo, Jian Chen   +8 more
doaj   +2 more sources

Adaptive virtual impedance control strategy based on IWOA-fuzzy PID and its application to reactive power sharing in islanded microgrids [PDF]

Scientific Reports
Accurate reactive power sharing in islanded microgrids is often compromised by resistive line impedances and parameter mismatches, causing power coupling and uneven distribution.
Yongxin Hou
doaj   +2 more sources

Accurate Reactive Power-Sharing Using Modified Droop Method Based on Virtual Impedance Control in the Islanded Microgrids [PDF]

هوش محاسباتی در مهندسی برق, 2023
In the islanded microgrids, distributed energy sources are responsible for power-sharing, and accurate power-sharing is essential among these microgrids.
Monir Ashrafi, Mehdi Banjaad, Ali Akbarzadeh Kalat, Ali Dastfan   +3 more
doaj   +1 more source

Virtual Biopsy by Electrical Impedance Spectroscopy in Barrett’s Carcinoma [PDF]

Journal of Gastrointestinal Cancer, 2021
Abstract Purpose Early detection of adenocarcinomas in the esophagus is crucial for achieving curative endoscopic therapy. Targeted biopsies of suspicious lesions, as well as four-quadrant biopsies, represent the current diagnostic standard.
Sandra Blößer, Andrea May, Lukas Welsch, Michael Ast, Susanne Braun, Thomas Velten, Margit Biehl, Jonas Tschammer, Elke Roeb, Mate Knabe   +9 more
openaire   +5 more sources

Adaptive Grid Impedance Shaping Approach Applied for Grid-Forming Power Converters

IEEE Access, 2022
This paper proposes an adaptive grid impedance shaping approach, implemented through a variable structure virtual impedance control strategy (VS-VIS), to improve the power flow control of grid-forming power converters (GF-PC).
Ricardo Lucio de Araujo Ribeiro, Arman Oshnoei, Amjad Anvari-Moghaddam, Frede Blaabjerg   +3 more
doaj   +1 more source

Influence Analysis of Virtual Impedance on the Stability of Parallel System of Inverters with Different Voltage Levels

Zhongguo dianli, 2021
Using virtual impedance technology to optimize the double closed-loop control structure can improve the equivalent output impedance of the inverter to be inductive and enhance the accuracy of power distribution by traditional inductive droop control ...
Wentao MA, Jinmei WANG, Yongqi WANG
doaj   +1 more source

Power decoupling control of paralleled virtual synchronous generators based on virtual complex impedance

Energy Reports, 2023
With the high ratio of distributed generation (DG) linked to power system via converters, power system stability is degraded in terms of inertia and damping.
Lei Wang, Tiecheng Li, Xuekai Hu, Ziwei Cheng, Bo Zhang   +4 more
doaj   +1 more source

Analysis and Suppression of Oscillation in Traction Network-EMUs Coupling System Under the Condition of Rising Pantograph

IEEE Access, 2022
Low frequency oscillation (LFO) incidents may occur in coupled system composed of electric multiple units (EMUs) and traction network, which threaten the safety and stability of EMUs and traction power supply system.
Xuesong Zhou, Yifan Hu, Youjie Ma, Yu Tian   +3 more
doaj   +1 more source

Parallel inverters control strategy based on adaptive virtual impedance

Journal of Hebei University of Science and Technology, 2023
In the low-voltage microgrid, the connection lines between parallel inverters are different due to the different length and loss, and the active power of the parallel inverters cannot be evenly distributed under the conventional droop control.
Yonggang LI, Yepeng WANG, Yuxia JIANG
doaj   +1 more source