Results 31 to 40 of about 620 (264)

Effect of Neutral Grounding Protection Methods for Compensated Wind/PV Grid-Connected Hybrid Power Systems

International Journal of Photoenergy, 2017
The effects of the wind/PV grid-connected system (GCS) can be categorized as technical, environmental, and economic impacts. It has a vital impact for improving the voltage in the power systems; however, it has some negative effects such as interfacing ...
Nurettin Çetinkaya, Farhana Umer
doaj   +1 more source

Diffusion Spectrum Imaging Maps Early Axonal Loss and a Unique Progressive Signal in Neuronal Intranuclear Inclusion Disease

Annals of Clinical and Translational Neurology, EarlyView.
ABSTRACT Objective To delineate specific in vivo white matter pathology in neuronal intranuclear inclusion disease (NIID) using diffusion spectrum imaging (DSI) and define its clinical relevance. Methods DSI was performed on 42 NIID patients and 38 matched controls.
Kaiyan Jiang, Yixiu Pei, Xiaobao Hu, Ying Xiong, Fang Wang, Yanyan Yu, Min Zhu, Dandan Tan, Meihong Zhou, Daojun Hong, Fuqing Zhou   +10 more
wiley   +1 more source

Stator grounding fault severity characterization and novel inverse-time protection method for large generators

International Journal of Electrical Power & Energy Systems
The existing injection-type stator grounding protection schemes for large generators are configured to issue only an alarm signal under high transition resistance grounding fault conditions. Thus, the fault cannot be promptly cleared.
Yikai Wang, Jie Ou, Jian Qiao, Zengping Wang, Xianggen Yin, Chunguang Ren   +5 more
doaj   +1 more source

Fault section locating method and recovery strategy of pole-to-ground fault for medium voltage direct current (MVDC) distribution network

The Journal of Engineering, 2019
High-resistance clamping grounding is a common grounding mode of modular multilevel converter (MMC) based DC distribution network. Due to the current limiting function of grounding resistor, pole-to-ground fault can only cause limited steady-state fault ...
Shan He, Guibin Zou, Chenjun Sun, Shiming Liu   +3 more
doaj   +1 more source

Current Tracking Adaptive Control of Brushless DC Motors

International Journal of Adaptive Control and Signal Processing, EarlyView.
In this paper, the current tracking for Brushless Direct Current motors is approached considering uncertainty in the parameters of the motor's model. An adaptive control scheme to compensate electrical parameters uncertainty is proposed without requiring any knowledge of the mechanical parameters.
Fernanda Ramos‐García, Axel Coronado‐Andrade, Gerardo Espinosa‐Pérez, Luis Alvarez‐Icaza   +3 more
wiley   +1 more source

Voltage Correlation Based Single Pole-to-Ground Fault Detection of MMC-HVDC Transmission Line

IEEE Access, 2021
Through analysis of various fault voltage characteristics of modular multilevel converter high voltage direct current (MMC-HVDC) transmission system, it shows that the positive and negative voltage relationships of direct current transmission lines with ...
Na An, Hongchun Shu, Bo Yang, Pulin Cao, Jian Song, Yu Guo   +5 more
doaj   +1 more source

Dynamic Precipitation during High‐Pressure Torsion of a Magnesium–Manganese Alloy

Advanced Engineering Materials, EarlyView.
An ultrafine‐grained alloy is produced by high‐pressure torsion of solutionized Mg–1.35 wt% Mn. Precipitation of nanometer‐scale Mn particles during deformation provides pinning sites. This prevents the formation of a bimodal grain structure and results in a finer grain size than for pure Mg.
Julian M. Rosalie, Anton Hohenwarter
wiley   +1 more source

Single-Pole High-Resistance Grounding Protection for DC Distribution Lines Based on Current Integral Quantity Correlation

Zhongguo dianli
When a single-pole high-resistance grounding fault occurs in a DC distribution system, the transient current amplitude is small and the fault characteristics are weak, making it hard for the existing protection methods to provide reliable protection for ...
Xingquan JI, Huizong MAO, Pingfeng YE, Zhiqiang LIU, Xiangxing ZHANG, Xinyue HUANG, Yachao NI   +6 more
doaj   +1 more source

Understanding the Effect of Resistance Temperature Detector Temperature Controllers on Microstructural Alignment in Magnetic Freeze Casting

Advanced Engineering Materials, EarlyView.
The effect of temperature controllers that are commonly used in freeze‐casting is investigated in this work. Temperature controllers are observed to generate a voltage in the slurry. Microstructural alignment and ultimate compressive strength data show this voltage to interfere with the ability to align the microstructure using magnetic fields ...
Maddie A. Schmitz, Steven E. Naleway
wiley   +1 more source

Fault phase selection of mine power supply system based on frequency distribution theory

Gong-kuang zidonghua, 2017
In view of the problem of ineffective selection of asymmetric mine neutral point ungrounded system while high resistance grounding occurs, a fault phase selection of mine power supply system based on frequency distribution theory was proposed. Each phase
YU Qun, CHEN Zhihui, HE Ziyua
doaj   +1 more source