Results 21 to 30 of about 791,080 (196)
Three-dimensional adaptive evolution of gravitational waves in numerical relativity [PDF]
, 2000 Adaptive techniques are crucial for successful numerical modeling of gravitational waves from astrophysical sources such as coalescing compact binaries, since the radiation typically has wavelengths much larger than the scale of the sources.
B. Brügmann +24 more
core +2 more sources
Frequency regulation optimization strategy of improved virtual synchronous generator under ultra-weak grid conditions [PDF]
AIP AdvancesTo enhance the frequency support capability of grid-forming energy storage systems governed by Virtual Synchronous Generators (VSGs) under ultra-weak grid conditions, an improved VSG frequency support strategy is proposed based on model predictive ...
Xucun Guo +5 more
doaj +1 more source
Microscopic Calculations of Weak Interaction Rates of Nuclei in Stellar Environment for A = 18 to 100 [PDF]
, 1999 We report here the microscopic calculation of weak interaction rates in stellar matter for 709 nuclei with A = 18 to 100 using a generalized form of proton-neutron quasiparticle RPA model with separable Gamow-Teller forces.
Klapdor-Kleingrothaus, H. V. +1 more
core +2 more sources
IEEE Access, 2020 Small-signal stability problems often occur when the inverter for renewable energy generation is connected to weak grid. A small-signal transfer function integrated model reflecting the interaction of grid impedance, phase locked-loop (PLL), and current ...
Zhiwei Xie +6 more
doaj +1 more source
Improved Fractional-order Damping Method for Voltage-controlled DFIG System Under Weak Grid
Journal of Modern Power Systems and Clean Energy, 2022 When a doubly-fed induction generator (DFIG) is connected to a weak grid, the coupling between the grid and the DFIG itself will increase, which will cause stability problems. It is difficult to maintain the tracking accuracy and ro-bustness of the phase-
Zhen Xie +3 more
doaj +1 more source
A Free-Form Lensing Grid Solution for A1689 with New Mutiple Images [PDF]
, 2014 Hubble Space Telescope imaging of the galaxy cluster Abell 1689 has revealed an exceptional number of strongly lensed multiply-imaged galaxies, including high-redshift candidates.
Benitez, N. +8 more
core +2 more sources
Robust Delay Compensation Strategy for LCL-Type Grid-Connected Inverter in Weak Grid
IEEE Access, 2022 Capacitor-current-feedback active damping has been widely adopted in digitally controlled LCL-type grid-connected inverters (GCIs). However, their digital control delay causes the system stability to deteriorate within a negative damping range ...
Xin Ding +4 more
doaj +1 more source
Overview of DFIG-based Wind Power System Resonances under Weak Networks [PDF]
, 2017 The wind power generation techniques are continuing to develop and increasing numbers of Doubly Fed Induction Generator (DFIG)-based wind power systems are connecting to the on-shore and off-shore grids, local standalone weak networks, and also micro ...
Blaabjerg, Frede, Song, Yipeng
core +2 more sources
INTEGRATION OF WIND FARMS INTO WEAK AC GRIDS [PDF]
, 2020 Large wind farms are usually located in remote and offshore areas. High voltage transmission systems that have long transmission distances are used to deliver the wind power to main grids. Weak AC grids have high impedance, low short circuit ratio (SCR) and/or low inertia compared to strong AC grids.
openaire +1 more source
A Robust Method for Controlling Grid-Connected Inverters in Weak Grids
IEEE Transactions on Circuits and Systems II: Express Briefs, 2021 Stable operation of grid-connected converters with the LCL filter is essential. Variations of the grid impedance and consequently, variations of the resonance frequency, can push the system toward instability. Also, delay that comes from sampling and PWM, could worsen the stability condition.
Akhavan, Ali; id_orcid 0000-0002-9123-8844 +2 more
openaire +2 more sources