Results 21 to 30 of about 28,834 (268)

Estimation of skin impedance models with experimental data and a proposed model for human skin impedance

IET Systems Biology, 2020
The skin is a complex biological tissue whose impedance varies with frequency. The properties and structure of skin changes with the location on the body, age, geographical location and other factors. Considering these factors, skin impedance analysis is a sophisticated data analysis.
Dhruba Jyoti, Bora, Rajdeep, Dasgupta
openaire   +3 more sources

Quasi-static pipeline in electroconvulsive therapy computational modeling

Brain Stimulation, 2023
Background: Computational models of current flow during Electroconvulsive Therapy (ECT) rely on the quasi-static assumption, yet tissue impedance during ECT may be frequency specific and change adaptively to local electric field intensity. Objectives: We
Gozde Unal, Cynthia Poon, Mohamad FallahRad, Myesha Thahsin, Miklos Argyelan, Marom Bikson   +5 more
doaj   +1 more source

Broadband Impedance Modeling and Sub/Super-synchronous Oscillation Analysis of Steam Turbine Generator

Zhongguo dianli
Impedance-based modeling and analysis method is currently one of the effective tools to analyze and solve the problem of renewable energy grid-connected broadband oscillation.
Muchi ZHAO, Haijiao WANG, Chun LIU, Guoqing HE, Yanxia SUN, Panpan WANG   +5 more
doaj   +1 more source

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

IEEE 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, Yunyang Xu, Liang Chen, Maowei Zhu   +3 more
doaj   +1 more source

Sequence Impedance Modeling and Analysis of Modular Multilevel Converter Considering DC Port Characteristics

Energies, 2023
The extensive deployment of Modular Multilevel Converters (MMCs) in AC/DC systems can lead to complex resonance issues. Impedance modeling forms the foundation for analyzing the stability of interconnected system.
Zheng Yan, Jianyuan Xu
doaj   +1 more source

Harmonic Resonance Mechanisms and Influencing Factors of Distributed Energy Grid-Connected Systems

World Electric Vehicle Journal
With the rapid development of global energy transformation and new power system, ensuring the stability of distributed energy grid connections is the key to maintaining the reliable operation of the whole power system.
Minrui Xu, Zhixin Li, Shufeng Lu, Tianyang Xu, Zhanqi Zhang, Xiangjun Quan   +5 more
doaj   +1 more source

A novel approach for voltage sag representation in a chemical industry: A case study

Engineering Reports, 2020
Voltage sag is a major Power Quality issue which may occur at every possible load point. In the industrial sector, its impact is particularly prominent at it is directly related to financial losses.
Chinmaya Behera, Abhishek Banik, Arup Kumar Goswami   +2 more
doaj   +1 more source

Coupling Impedance Modeling Analysis of Grid-Connected Inverters Under Three-Phase Voltage Unbalance

Energies
Under the condition of asymmetric system voltage, grid-connected inverters exhibit obvious sequence impedance frequency coupling characteristics, which can easily lead to resonance and the misoperation of protection and control devices.
Yang Liu, Haidong Yu, Qihang Wu, Bin Wang, Lisheng Li, Wenbin Liu   +5 more
doaj   +1 more source

Explicit Impedance Modeling and Shaping of Grid-Connected Converters via an Enhanced PLL for Stabilizing the Weak Grid Connection

IEEE Access, 2022
The voltage source converters (VSCs) are used to interface and control the renewable energy resources that are integrated into the power grids. However, a weak grid connection raises a stability problem for grid synchronization of the grid-feeding ...
Mohsen Eskandari, Andrey V. Savkin, Hassan Haes Alhelou, Frede Blaabjerg   +3 more
doaj   +1 more source

Effective impedance modeling of metamaterial structures [PDF]

Journal of the Optical Society of America A, 2016
We present methods for retrieving the effective impedance of metamaterials from the Fresnel reflection coefficients at the interface between two semi-infinite media. The derivation involves the projection of rigorous modal expansions onto the dominant modes of the two semi-infinite media.
Kokou B, Dossou, Christopher G, Poulton, Lindsay C, Botten   +2 more
openaire   +3 more sources