Results 31 to 40 of about 4,684 (264)
Stability Improvement for Three-Phase Grid-Connected Converters Through Impedance Reshaping in Quadrature-Axis [PDF]
IEEE Transactions on Power Electronics, 2018 Three-phase AC−DC and DC−AC power converters have been extensively employed as grid-interfaces in various applications, e.g., distributed generation and energy storage systems. In these applications, power converters should always synchronize with the mains grid so that active and/or reactive power can properly be regulated while maintaining desired ...
Jingyang Fang +3 more
openaire +2 more sources
Energies, 2020 High frequency resonance (HFR) is a subsistent problem which affects the operation of the voltage source converter (VSC) connected to the parallel compensated grid.
Bo Pang, Feng Li, Hui Dai, Heng Nian
doaj +1 more source
Laser writing of bright colours on near-percolation plasmonic reflector arrays [PDF]
, 2018 Colouration by surface nanostructuring has attracted a great deal of attention by the virtue of making use of environment-friendly recyclable materials and generating non-bleaching colours [1-8].
Beermann, Jonas +7 more
core +2 more sources
A Gray-Box Impedance Reshaping Method of Grid-Connected Inverter for Resonance Damping [PDF]
2019 10th International Conference on Power Electronics and ECCE Asia (ICPE 2019 - ECCE Asia), 2019 Oscillation phenomenon of grid-connected inverter can be caused due to time-varying grid impedance. Terminal output impedance of inverter can be reshaped by re-tuning internal parameters of inverter to mitigate the oscillation issue. However, it's not easy to obtain internal parameters of grid-connected inverter in practical operation.
Weihua Zhou +3 more
openaire +2 more sources
Stability Enhancement for Parallel Grid-Connected Inverters by Improved Notch Filter
IEEE Access, 2019 As parallel inverters connected to the weak grid, the interactions between the inverters and the grid are the potential threat to the system stability.
Ling Yang +3 more
doaj +1 more source
Uniform Refraction in Negative Refractive Index Materials [PDF]
, 2015 We study the problem of constructing an optical surface separating two homogeneous, isotropic media, one of which has a negative refractive index. In doing so, we develop a vector form of Snell's law, which is used to study surfaces possessing a certain ...
Gutierrez, Cristian E., Stachura, Eric
core +3 more sources
Impedance Reshaping for Inherent Harmonics in PMSM Drives With Small DC-Link Capacitor
IEEE Transactions on Power Electronics, 2022 Sharp LC resonance peak may enlarge inherent harmonics, dominant harmonics of the supply voltage generated by a three-phase diode rectifier, around the resonance frequency, which will intensify fluctuations of the DC-link voltage and grid currents in motor drives with small DC-link capacitor.
Dawei Ding +6 more
openaire +2 more sources
SSO Suppression Strategy of DFIG-Based Wind Turbine Based on Impedance Reshaping
IOP Conference Series: Earth and Environmental Science, 2020 Abstract In order to suppress the sub-synchronous oscillation (SSO) of DFIG-based wind power generation system, a new suppression strategy based on impedance reshaping is proposed in this paper. Firstly, the impedance model of DFIG-based wind power generation system set in static coordinate system is established, and the mechanism of SSO
Qihui Liu, Chun Shi, Simin Pang
openaire +1 more source
Processing carbon nanotubes with holographic optical tweezers
, 2004 We report the first demonstration that carbon nanotubes can be trapped and manipulated by optical tweezers. This observation is surprising because individual nanotubes are substantially smaller than the wavelength of light, and thus should not be ...
Ashkin +19 more
core +1 more source
The role of histone modifications in transcription regulation upon DNA damage
FEBS Letters, EarlyView.This review discusses the critical role of histone modifications in regulating gene expression during the DNA damage response (DDR). By modulating chromatin structure and recruiting repair factors, these post‐translational modifications fine‐tune transcriptional programmes to maintain genomic stability.
Angelina Job Kolady, Siyao Wang
wiley +1 more source