Results 41 to 50 of about 123,509 (118)

A novel method for in-situ extracting bio-impedance model parameters optimized for embedded hardware. [PDF]

Sci Rep, 2023
Simić M, Freeborn TJ, Šekara TB, Stavrakis AK, Jeoti V, Stojanović GM.   +5 more
europepmc   +1 more source

Seismic inversion with L_2,0-norm joint-sparse constraint on multi-trace impedance model. [PDF]

Sci Rep, 2022
Dai R, Yang J.
europepmc   +1 more source

Stability Investigation and Improvement for DC Cascade Systems with Simplified Impedance-based Stability Criterion

CSEE Journal of Power and Energy Systems
In DC distributed power systems (DPSs), the complex impedance interactions possibly lead to DC bus voltage oscillation or collapse. In previous research, the stability analysis of DPSs is implemented based on mathematical analysis in control theory.
Junbin Fang, Zhikang Shuai, Yang Li, Zhibing Wang, Xiangyang Wu, Xia Shen, Z. John Shen   +6 more
doaj   +1 more source

Improving the Stability and Accuracy of Power Hardware-in-the-Loop Simulation Using Virtual Impedance Method

Energies, 2016
Power hardware-in-the-loop (PHIL) systems are advanced, real-time platforms for combined software and hardware testing. Two paramount issues in PHIL simulations are the closed-loop stability and simulation accuracy.
Xiaoming Zha, Chenxu Yin, Jianjun Sun, Meng Huang, Qionglin Li   +4 more
doaj   +1 more source

Measurement of the dielectric constant in a microwave near field

The Journal of Engineering, 2019
This study describes a method based on the measurement of a reflection coefficient to determine the dielectric constant of a sample by near-field microwave. A mathematical relation between the reflection coefficient and the parameters of a lumped circuit
Zhaoqi Zhong, Xiaolong Chen, Huiting Huan, Huiting Huan   +3 more
doaj   +1 more source

A novel method for estimating the fractional Cole impedance model using single-frequency DC-biased sinusoidal excitation. [PDF]

Circuits Syst Signal Process, 2021
Zhang F, Teng Z, Yang Y, Zhong H, Li J, Rutkove SB, Sanchez B.   +6 more
europepmc   +1 more source

Mechanism of Suppressing DFIG Shafting–Grid-Connected Oscillations Through Coordinated Optimization of Dual Damping Terms Under Frequency Coupling

Energies
Sub-synchronous oscillations (SSOs) induced by the interaction between doubly fed induction generators (DFIGs) and weak grids pose a critical threat to the grid-connected stability of DFIG-based wind power systems.
Zheng Wang, Yimin Lu
doaj   +1 more source

A neural network design for black-box identification of converter impedance models in arbitrary operating conditions

电力工程技术
The impedance-based method is favored by engineering because it can analyze system stability under conditions with the unknown device control structure or parameters.
CHEN Bing, ZHAO Chongbin, JIANG Qirong, WANG Xu, WANG Fangming   +4 more
doaj   +1 more source

Analysis of frequency oscillation characteristics in grid-forming multi-VSG systems considering power coupling

电力工程技术
Grid-forming converters controlled by virtual synchronous generator （VSG） provide a certain amount of inertia and damping support for new energy sources to be connected to the grid.
Wei LI, Meiling MA, Weiqing SUN
doaj   +1 more source

Electromechanical Impedance Model for Free 1D Thin-Walled Piezoelectric Ceramics with a Novel Derivation. [PDF]

Materials (Basel), 2020
Kong X, Chen C, Liu X, Zhu J, Qing X.
europepmc   +1 more source