Results 21 to 30 of about 128,171 (294)
Impedance-Based High Frequency Resonance Analysis of DFIG System in Weak Grids [PDF]
, 2017 The impedance-based model of Doubly Fed Induction Generator (DFIG) systems, including the rotor part (Rotor Side Converter (RSC) and induction machine), and the grid part (Grid Side Converter (GSC) and its output filter), has been developed for analysis ...
Blaabjerg, Frede +2 more
core +2 more sources
Quasi-Proportional Resonance Control of Grid-Connected Inverter Based on Grid Impedance
Zhongguo dianli, 2019 With the large-scale integration of renewable energy to the grid, the problem of sub/super-synchronous oscillations caused by the interaction of renewable energy grid-connected inverters with the grid has drawn great public attention.
Shaojian SONG +4 more
doaj +1 more source
Energies, 2021 This paper proposes a deep-learning-based method for frequency-dependent grid impedance estimation. Through measurement of voltages and currents at a specific system bus, the estimate of the grid impedance was obtained by first extracting the sequences ...
Azam Bagheri +3 more
doaj +1 more source
Millimeter-wave diode-grid phase shifters [PDF]
, 1988 Monolithic diode grids have been fabricated on 2-cm square gallium-arsenide wafers with 1600 Schottky-barrier varactor diodes. Shorted diodes are detected with a liquid-crystal technique, and the bad diodes are removed with an ultrasonic probe.
Chen, Howard Z. +5 more
core +1 more source
IEEJ Journal of Industry Applications, 2018 Power quality problems caused by grid-connected renewable energy inverters have been reported in recent literature. Excessive harmonics and interharmonics may arise when the inverter starts to interact with the grid impedance. Small-signal impedance models have been proven to be useful tools to analyze the stability margins.
Aapro Aapo +7 more
openaire +2 more sources
Optimizing the roles of unit and non-unit protection methods within DC microgrids [PDF]
, 2012 The characteristic behavior of physically compact, multiterminal dc networks under electrical fault conditions can produce demanding protection requirements.
Burt, Graeme +4 more
core +1 more source
Improving synchronization stability of grid connected converters by virtual impedance
IET Generation, Transmission & Distribution, 2021 With the increasing penetration of inverter based distributed generation, recent grid codes do not permit the disconnection of converters as soon as fault happens.
Omid Abdoli +2 more
doaj +1 more source
IEEE Access, 2022 The voltage source converters (VSCs) are used to interface and control the renewable energy resources that are integrated into the power grids. However, a weak grid connection raises a stability problem for grid synchronization of the grid-feeding ...
Mohsen Eskandari +3 more
doaj +1 more source
Stability analysis of distributed generation grid-connected inverter
The Journal of Engineering, 2019 With the distributed new energy power generation increased, the power grid system becomes more and more complex, leading to its stability more likely to be affected. Among them, the resonance caused by impedance mismatch is particularly critical.
Xuemei Zheng +4 more
doaj +1 more source
Real-Time Grid Impedance Estimation Using a Converter [PDF]
2019 IEEE Energy Conversion Congress and Exposition (ECCE), 2019 This paper presents two real-time methods for estimating the grid inductance and resistance using a three-phase converter. In the methods, a single-frequency rotating voltage signal with a small magnitude is injected to the converter voltage reference. The converter measures the currents and voltages at the point of common coupling (PCC).
Routimo, Mikko +3 more
openaire +3 more sources