Results 31 to 40 of about 7,136,886 (221)
A pre-charging strategy based on composite frequency control for a modular multilevel DC transformer
Energy Reports, 2022 Modular multilevel DC transformers(MMDCTs) have become a research focus in DC grids with different voltage levels based on their advantages of strong expansibility and high voltage levels.
Zhendong Ji +5 more
doaj +1 more source
Deep Underground Science and Engineering, EarlyView.For the roof of coral reef limestone caverns, a novel tension‐shear composite failure mechanism was developed. The most critical tensile crack model was identified using a hybrid optimization algorithm, and the stability of the cavern roof was analyzed accordingly.
Dongsheng Xu, Chenxu Li, Chuantan Hou
wiley +1 more source
Investigation on tunnel stability considering pipe‐roof support with transparent soil technology
Deep Underground Science and Engineering, EarlyView.This study integrates transparent soil technology, 3D reconstruction and numerical simulation to captures the full‐field deformation of shield tunnel instability. Results demonstrate that pipe‐roof support enhances stability via the “soil‐arching barrier effect,” effectively restraining failure wedge development by extending stress transfer paths ...
Zhi Jia +4 more
wiley +1 more source
Applied SciencesIn practical engineering, due to the residual magnetism in the iron core of the converter transformer, the inrush current is generated in the case of no-load closing, and the inrush current leads to an oil flow surge inside the converter transformer ...
Wenhao He +8 more
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Deep Underground Science and Engineering, EarlyView.To address seepage‐induced tunnel face collapse, this study develops a two‐phase double‐point MPM framework to capture large‐deformation hydro‐mechanical interactions. Incorporating a cementation‐based constitutive model with dynamic permeability updates, the model is successfully validated against saturated granular‐column collapse experiments ...
Yue Tong +6 more
wiley +1 more source
Solid-State Inrush Current Limiter Controller Based on Inrush Prediction for Large Transformers
CoRR, 2020 Inrush current problems of the industrial transformers are occasionally more serious than the utility transformers. A new Solid-State Inrush Current Limiter (SSICL) is proposed for medium voltage power transformers. The SSICL consists of three similar sets.
Nima Tashakor +4 more
openaire +3 more sources
International Journal of Mechanical System Dynamics, EarlyView.ABSTRACT Classical Zero Vibration (ZV) and Zero Vibration and Derivative (ZVD) input shapers are designed around a fixed nominal natural frequency and cannot accommodate the time‐varying dynamics introduced when an overhead crane simultaneously travels and hoists a payload.
Mohammad Alfares, Khaled Alhazza
wiley +1 more source
Inrush current method of transformer based on wavelet packet and neural network
The Journal of Engineering, 2018 The transformer is an important equipment of power system; its operation state is directly related to the security and stability of the power system. Aiming at the problem that the differential protection of power transformer has been plagued by inrush ...
Wei Wang +5 more
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Gong-kuang zidonghua, 2021 The current researches on the application of direct current resistivity method in coal seam floor water inrush monitoring mainly focus on the resistivity response characteristics of the deformation and damage of the floor, and there are few researches on
LU Jingji
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Safety Science and Technology, EarlyView.This review systematically outlines two‐stage power management circuits for TENGs, integrating AC–DC and DC–DC conversion to overcome high impedance and unstable output. It highlights strategies for efficient energy extraction and stable power delivery, enabling the development of reliable self‐powered systems for safety monitoring and applications in ...
Jiaxin Hu +5 more
wiley +1 more source