Results 21 to 30 of about 147,643 (299)

Study on Harmonic Impedance Estimation and Harmonic Contribution Evaluation Index

open access: yesIEEE Access, 2020
Harmonic impedance estimation and suitable evaluation index selection are the key steps of harmonic contribution evaluation. Most of the traditional harmonic impedance estimation methods are only applicable to the scenario, where the background harmonic ...
Ziteng Liu   +3 more
doaj   +1 more source

Second harmonic voltage injection‐based self impedance estimation for effective decoupled droop control in a microgrid

open access: yesEnergy Conversion and Economics, 2022
In an islanded microgrid (IMG), droop control effectively shares real and reactive power demands among distributed generators (DGs), thereby regulating the frequency and voltage in high X/R ratio networks.
Muli Malakondaiah   +3 more
doaj   +1 more source

Improve the quality of "dead band" audio-frequency magnetotelluric impedance data using electric field remote reference

open access: yes矿业科学学报, 2022
Magnetic remote-reference is the most practical noise suppression method in magnetotelluric data processing.In actual audio-frequency magnetotelluric (AMT) sounding observation, usually the "one with three" or "one with four" acquisition method is used ...
Ma Fangyuan   +5 more
doaj   +1 more source

Direction-of-arrival estimation with blind surface impedance compensation for spherical microphone array [PDF]

open access: yesJASA Express Letters, 2021
The direction-of-arrival (DoA) estimation from spherical microphone array data requires mode strength compensation for removing the dependency on the array surface impedance.
Dongheon Lee, Byeongho Jo, Jung-Woo Choi
doaj   +1 more source

Assessment on Harmonic Emission Level of Residential Loads with Symmetry and Volatility Constraints

open access: yesZhongguo dianli, 2020
The accuracy of harmonic emission level assessment of residential loads is affected by background harmonics or three-phase harmonic unbalance. Based on Norton’s and Davinan’s theorem, a model is constructed for assessment of harmonic emission level.
Huaying ZHANG   +5 more
doaj   +1 more source

Responsive and Resilient Vector Current Control for Variable Grids

open access: yesIEEE Open Journal of Power Electronics, 2023
This article presents a set of control enhancements for standard vector current control (VCC) that improves its stability and dynamic performance in an extended range of SCRs.
Mathieu Kervyn de Meerendre   +2 more
doaj   +1 more source

Low-parametric Induced Current-Magnetic Resonance Electrical Impedance Tomography for quantitative conductivity estimation of brain tissues using a priori information: a simulation study [PDF]

open access: yes, 2010
Accurate estimation of the human head conductivity is important for the diagnosis and therapy of brain diseases. Induced Current - Magnetic Resonance Electrical Impedance Tomography (IC-MREIT) is a recently developed non-invasive technique for ...
Crevecoeur, Guillaume   +2 more
core   +2 more sources

Dynamic Online Grid Impedance Estimation and Its Effects on DC Capacitor Lifetime in Variable Frequency Drive

open access: yesIEEE Access, 2022
Grid impedance plays a significant role in the performance and design considerations of nonlinear devices like Variable Frequency Drive (VFD). VFD operates across domestic, industrial, and residential applications under different grid configurations and ...
Ramesh Pandurangan   +2 more
doaj   +1 more source

Grid impedance estimation for islanding detection and adaptive control of converters [PDF]

open access: yes, 2016
The grid impedance is time varying due to the changing structure of the power system configuration and it can have a considerable influence on the control and stability of grid connected converters. This paper presents an online grid impedance estimation
El-Sayes, M.A.   +4 more
core   +4 more sources

Estimation of Involuntary Components of Human Arm Impedance in Multi-Joint Movements via Feedback Jerk Isolation

open access: yesFrontiers in Neuroscience, 2020
Stable and efficient coordination in physical human-robot interaction requires consideration of human feedback behavior. In unpredictable tasks, where voluntary cognitive feedback is too slow to guarantee desired task execution, the human must rely on ...
Hendrik Börner   +2 more
doaj   +1 more source

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