Results 41 to 50 of about 172,799 (305)

High Frequency Harmonic Cancellation in Ball-screw Drives

Procedia CIRP, 2012
AbstractIn many machining processes cutting forces are of harmonic nature. The frequency content of these forces may extend far beyond the closed-loop bandwidth of the commonly used feed drive controllers. In ball screw drives, high–frequency disturbances may also originate from repetitive errors synchronized with the rotation of the ball screw.
Hosseinkhani, Yasin, Erkorkmaz, Kaan
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Characteristic Harmonic Spectrum Relocating for Controlling Specific Inter-Harmonics of Inverters With New Phase-Shifted Rotating PWM

IEEE Access, 2020
The problems of sub-synchronous oscillation and high-frequency oscillation related to inter-harmonics need to be solved in intermittent energy generation systems.
Jie Xie, Lei Xu, Hui Zhang, Yigang He, Ruaa M. Rashad Ghandour, Jintao Zhou, Yuanzhe Ge, Qizhen Li   +7 more
doaj   +1 more source

An improved single phase SPLL with DC and harmonics suppression

Energy Reports, 2023
This paper has proposed an improved single phase software phase lock loop (SPLL) with the ability of grid voltage DC and harmonics components suppression.
Long Xiao, Dongdong Chen
doaj   +1 more source

Accurate Analysis of Harmonic Transmission of Line Commutated Converter Considering Firing Angle Fluctuation

IEEE Access, 2020
Line commutated converter (LCC) has been widely applied in hybrid high voltage direct current (HVDC) transmission system, where the modular multilevel converter (MMC) is applied as receiving end and may induce low order harmonics in DC-link voltage ...
He Huang, Junpeng Ma, Shunliang Wang, Yuqing Dong, Ning Jiao, Tianqi Liu   +5 more
doaj   +1 more source

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   +1 more source

Tunable plasma wave resonant detection of optical beating in high electron mobility transistor [PDF]

, 2006
We report on tunable terahertz resonant detection of two 1.55 µm cw-lasers beating by plasma waves in AlGaAs/InGaAs/InP high-electron-mobility transistor.
Akwoue-Ondo, A., Bollaert, S., Chusseau, L., Nouvel, P., Shchepetov, A., Teppe, F., Torres, Jérémi   +6 more
core   +3 more sources

Random PWM Technique Based Two-State Markov Chain for Permanent Magnet Synchronous Motor Control

Applied Sciences
On the basis of the space voltage vector pulse width modulation (SVPWM) technique, the random pulse width modulation (RPWM) technique, which can reduce harmonics, is investigated based on the vector control system of permanent magnet synchronous motor ...
Zhiqiang Wang, Xinyuan Liu, Xuefeng Jin, Guozheng Zhang, Zhichen Lin   +4 more
doaj   +1 more source

Spatio-temporal coupling of attosecond pulses [PDF]

, 2018
The shortest light pulses produced to date are of the order of a few tens of attoseconds, with central frequencies in the extreme ultraviolet range and bandwidths exceeding tens of eV.
Arnold, Cord L.,, Carlström, Stefanos,, Coudert-Alteirac, Hélène,, Dacasa, Hugo,, Gaarde, Mette B.,, Guo, Chen,, Johnsson, Per,, L'Huillier, Anne,, Lahl, Jan,, Lund University., Lund University., Lund University., MacLot, Sylvain,, Peschel, Jasper,, Rudawski, Piotr,, Smorenburg, Peter W.,, Vogelsang, Jan,, Wikmark, Hampus,   +17 more
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Study on the Mechanism and Influencing Factors of Sideband Harmonics in Flexible DC Transmission Projects

Applied Sciences
The bridge arms and DC voltage of China’s Four-Terminal Flexible DC Transmission Project exhibit persistent high-frequency harmonics over the medium to long term, causing issues such as overheating losses and electromagnetic interference within the ...
Qing Huai, Yirun Ji, Wang Zhang, Fang Zhang   +3 more
doaj   +1 more source

High Frequency Harmonics Emission in Smart Grids [PDF]

, 2013
The term ‘smart grid‘, is nowadays very often used in many publications and so far has not been explicitly defined, however it refers mainly to such an operation of electricity delivery process that allows to optimize energy efficiency by flexible interconnection of central and distributed generators through transmission and distribution system to ...
openaire   +2 more sources