Results 21 to 30 of about 178,149 (329)

Modeling and Harmonic Stability of MMC-HVDC With Passive Circulating Current Filters

open access: yesIEEE Access, 2020
A modular multilevel converter (MMC) is an emerging converter technology widely used in wind power applications using high-voltage direct current (HVDC) transmission, and it has been largely investigated in medium-voltage solar harvesting as well as ...
Bo Zhang, Hamed Nademi
doaj   +1 more source

Real-time dynamic articulations in the 2-D waveguide mesh vocal tract model [PDF]

open access: yes, 2006
Time domain articulatory vocal tract modeling in one-dimensional (1-D) is well established. Previous studies into two-dimensional (2-D) simulation of wave propagation in the vocal tract have shown it to present accurate static vowel synthesis.
Howard, David M.   +2 more
core   +2 more sources

Electric Vehicle Fast-Charging Station Unified Modeling and Stability Analysis in the dq Frame

open access: yesEnergies, 2018
The electric vehicle fast-charging station is an important guarantee for the popularity of electric vehicle. As the fast-charging piles are voltage source converters, stability issues will occur in the grid-connected fast-charging station.
Xiang Wang, Zhengyou He, Jianwei Yang
doaj   +1 more source

d-q Small-Signal Model for Grid-Forming MMC and Its Application in Electromagnetic-Transient Simulations

open access: yesEnergies, 2023
The modular multilevel converter (MMC) is a keystone of modern energy transmission systems. Consequently, there is an ongoing pursue for mathematical models to represent it under different configurations and control approaches.
Cleiton M. Freitas   +2 more
doaj   +1 more source

Impedance Modeling and Stability-Oriented Parameter Optimization of Isolated Dual Active Bridge-Based Two-Stage AC-DC-DC Converter

open access: yesFrontiers in Energy Research, 2022
The isolated dual active bridge (DAB)-based two-stage AC-DC-DC converters have been widely applied in grid-connected power electronics systems. However, the impedance interactions between the DAB converter and the AC-DC rectifier can cause instability ...
Fan Feng   +4 more
doaj   +1 more source

Impedance modeling of DC grid considering the frequency-dependent characteristics of cable and overhead line parameters

open access: yes电力工程技术, 2022
The fault characteristics of direct current (DC) grids can be analyzed by addressing the grid damping characteristics. However,the frequency-dependent characteristics of the transmission line parameters are usually ignored in the conventional grid ...
CHEN Siwei   +5 more
doaj   +1 more source

Waveguide physical modeling of vocal tract acoustics: flexible formant bandwidth control from increased model dimensionality [PDF]

open access: yes, 2006
Digital waveguide physical modeling is often used as an efficient representation of acoustical resonators such as the human vocal tract. Building on the basic one-dimensional (1-D) Kelly-Lochbaum tract model, various speech synthesis techniques ...
Howard, D M, Mullen, J, Murphy, D T
core   +1 more source

Validation by Measurements of a IC Modeling Approach for SiP Applications [PDF]

open access: yes, 2011
The growing importance of signal integrity (SI) analysis in integrated circuits (ICs), revealed by modern systemin-package methods, is demanding for new models for the IC sub-systems which are both accurate, efficient and extractable by simple ...
Canavero, Flavio   +8 more
core   +1 more source

Modeling electrochemical impedance spectroscopy [PDF]

open access: yesCurrent Opinion in Electrochemistry, 2019
Abstract Electrochemical impedance spectroscopy (EIS) is a powerful technique that is used for characterizing electrochemical systems. The EIS data can be correlated with many key physical properties, including rates of diffusion and reaction, and microstructural features.
openaire   +2 more sources

Modeling and Analysis of DC-Link Dynamics in DFIG System With an Indicator Function

open access: yesIEEE Access, 2019
The doubly fed induction generator (DFIG) is the most widely applied wind turbine in practice and contains a dc-link capacitance in its back-to-back converter to deliver the generated power and to provide dc-link voltage for converters.
Heng Nian   +3 more
doaj   +1 more source

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