Results 31 to 40 of about 3,167,411 (345)
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
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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
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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
IEEE Transactions on Circuits and Systems Part 1: Regular Papers, 2022 Although the cyber-physical system stability is widely studied, scholars focus more on system stability with communication time delay. Therein, grid-connected inverters with the digital control system are regarded as one simplest and typical cyber ...
Rui Wang +5 more
semanticscholar +1 more source
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
EnergiesGiven the problems that the phase-locked loop frequency coupling effect (PLL-FCE) in a weak grid reduces the quality of the output current waveform and brings challenges to maintaining a steady running of the grid-connected converter (GCC), this paper ...
Ye Zhang, Haibo Pen, Xiaoyu Zhang
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Frontiers in Energy Research, 2022 Under weak grid conditions, the variation of the grid impedance will affect the steady-state and dynamic performance of the LCL-filtered grid-connected inverter and even make the inverter unstable.
Fuyun Wu +4 more
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Tuning Method of a Grid-Following Converter for the Extremely-Weak-Grid Connection
IEEE Transactions on Power Systems, 2022 This letter proves that a grid-following converter can stably connect to a weak grid even short-circuit ratio (SCR) is 1. Root instability causes of this grid-following control are identified including fast control response, insufficient damping, and ...
Chuanyue Li, Sheng Wang, Jun Liang
semanticscholar +1 more source