Results 11 to 20 of about 48,016 (315)

Elimination Methods for High-Frequency Harmonics on the DC Side of Modular Multilevel Converters from the Perspective of Valve Control

Energies
Modular multilevel converter (MMC)-based HVDC systems have become one promising way to integrate a large amount of renewable energy. However, the high-frequency harmonics problem could seriously affect the safety and stable operation level of MMC-HVDCs ...
Qing Huai, Yirun Ji, Minxiang Yang, Ziyao Jie, Xi Yuan, Xiang Xu   +5 more
doaj   +2 more sources

High-frequency harmonics suppression in high-speed railway through magnetic integrated LLCL filter [PDF]

PLoS ONE
Maged Al-Barashi, Yongjun Wang, Muhammad Shoaib Bhutta   +2 more
doaj   +2 more sources

Analysis of high frequency harmonics in distribution networks: 9 – 150 kHz

2019 IEEE International Conference on Industrial Technology (ICIT), 2019
Improvement of power electronic technologies can also introduce various new types of distortions in electrical power systems due to high switching frequency of power converters.
Rathnayake, Hansika, Rehman, Tayyab, Firuz Zare, Yaghoobi, Jalil, Zare, Firuz, Tayyab Rehman, Jalil Yaghoobi, Hansika Rathnayake   +7 more
core   +5 more sources

Simulation research on high-speed motor current harmonic elimination methods [PDF]

MATEC Web of Conferences, 2022
A large number of harmonics will be generated in the process of transforming high frequency and high voltage alternating current (AC) into a constant frequency and constant voltage through a power conversion system when the high-speed motor is used as a ...
Cui Hong, Gao Youqing
doaj   +1 more source

High‐Frequency Wave Generation in Magnetotail Reconnection: Nonlinear Harmonics of Upper Hybrid Waves

Geophysical Research Letters, 2019
MMS3 spacecraft passed the vicinity of the electron diffusion region of magnetotail reconnection on 3 July 2017, observing discrepancies between perpendicular electron bulk velocities and E→×B→ drift, and agyrotropic electron crescent distributions ...
Kyunghwan Dokgo, Kyoung‐Joo Hwang, James L. Burch, Eunjin Choi, Peter H. Yoon, David G. Sibeck, Daniel B. Graham   +6 more
doaj   +2 more sources

Propagation Characteristics and Identification of High-Order Harmonics of a Traction Power Supply System

Energies, 2022
High-order harmonics in the traction power supply show negative effects on the safe and stable operation of the railway transportation system. There is a fixed resonant frequency in the traction network.
Miaoxin Jin, Yuehuan Yang, Jiapeng Yang, Mingli Wu, Ganghui Xie, Kejian Song   +5 more
doaj   +1 more source

High-frequency harmonic imaging of the eye [PDF]

SPIE Proceedings, 2005
PURPOSE: Harmonic imaging has become a well-established technique for ultrasonic imaging at fundamental frequencies of 10 MHz or less. Ophthalmology has benefited from the use of fundamentals of 20 MHz to 50 MHz. Our aim was to explore the ability to generate harmonics for this frequency range, and to generate harmonic images of the eye.
Ronald H, Silverman, D Jackson, Coleman, Jeffrey A, Ketterling, Frederic L, Lizzi   +3 more
openaire   +2 more sources

High-Level Vibration for Single-Frequency and Multi-Frequency Excitation in Macro-Composite Piezoelectric (MFC) Energy Harvesters, Nonlinearity, and Higher Harmonics

Micromachines, 2022
This paper presents an extensive experimental investigation to identify the influence of signal parameters on a piezoelectric harvester’s performance. A macro-fibre composite energy harvester was studied as an advanced, flexible, high-performance energy ...
Majid Khazaee
doaj   +1 more source

An Analysis Method for Frequency and Transient Harmonics of Isolated Network Under Instable Condition

Zhongguo dianli, 2021
Focusing on the problem of spectrum leakage in Fourier harmonic analysis caused by rapid broadband changes in frequency and harmonics in isolated network under unstable condition, an analysis method for frequency and transient harmonics is proposed based
Denghui YANG, Mingxing ZHU, Bin XU
doaj   +1 more source

Research on the Harmonics Penetration Characteristics of the Traction Network to Three-Phase 380 V Power System of the Traction Substation and Suppression Scheme

IEEE Access, 2020
To reveal the penetration characteristics of high-frequency harmonics of the traction network to the three-phase 380 V power system in the traction substation (TSS), the harmonic equivalent circuit model and harmonic penetration mathematical model of the
Yuanzhe Zhao, Linjie Ren, Guobin Lin, Fei Peng   +3 more
doaj   +1 more source