Results 21 to 30 of about 187,993 (287)

Frequency-coupled impedance model based subsynchronous oscillation analysis for direct-drive wind turbines connected to a weak AC power system

The Journal of Engineering, 2019
Recently, the emerging subsynchronous oscillation (SSO) issue caused by interactions between power electronic converters and weak grids has provoked serious stability concerns. Impedance modelling based method has been widely used to analyse the emerging
Wei Liu, Xiaorong Xie, Jan Shair, Jingbo He   +3 more
doaj   +1 more source

Impedance-compensated grid synchronisation for extending the stability range of weak grids with voltage source converters [PDF]

, 2016
This paper demonstrates how the range of stable power transfer in weak grids with voltage source converters (VSCs) can be extended by modifying the grid synchronisation mechanism of a conventional synchronous reference frame phase locked loop (PLL).
D'Arco, Salvatore, Molinas Cabrera, Marta, Rodríguez Cortés, Pedro, Suul, Jon Are   +3 more
core   +2 more sources

Adaptive mesh refinement with spectral accuracy for magnetohydrodynamics in two space dimensions [PDF]

, 2007
We examine the effect of accuracy of high-order spectral element methods, with or without adaptive mesh refinement (AMR), in the context of a classical configuration of magnetic reconnection in two space dimensions, the so-called Orszag-Tang vortex made ...
A Pouquet, Bruno R, Canuto C, D Rosenberg, Deville M O, Ferziger J H, Kovasznay L, Landau D, Maday Y Patera A T Rønquist E M, Matthaeus W H, P D Mininni, Rosenberg D, Shewchuck R J, Weisstein E W   +13 more
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Three-points interfacial quadrature for geometrical source terms on nonuniform grids [PDF]

, 2011
International audienceThis paper deals with numerical (finite volume) approximations, on nonuniform meshes, for ordinary differential equations with parameter-dependent fields.
A. Harten, A. Quarteroni, B. Fornberg, B. Gustafsson, B. Perthame, B. Wendroff, C. Arvanitis, C. Simeoni, C.L. Epstein, C.R. Doering, Chiara Simeoni, D. Bresch, E. Hairer, E. Hairer, E. Turkel, E.F. Toro, F. Bouchut, H.F. Wang, J. Pike, J.D. Hoffman, K.P. Hadeler, L.R. Bentley, M. Hinze, M.E. Gurtin, M.E. Hubbard, M.J. Berger, O.V. Vasilyev, R.J. LeVeque, S.N. Kružkov, Th. Katsaounis, Th. Katsaounis, Theodoros Katsaounis   +31 more
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Stability analysis of large wind farms connected to weak AC networks incorporating PLL dynamics [PDF]

, 2015
Voltage source converter interfaced wind turbines connected to weak grids can induce system instability. A state space model is used in this paper to study the stability of large wind farms.
Givaki, Kamyab, Xu, Lie
core   +1 more source

Modelling and Stability Analysis of Wind Power Plants Connected to Weak Grids

Applied Sciences, 2019
It is important to develop modelling tools to predict unstable situations resulting from the interactions between the wind power plant and the weak power system.
Esmaeil Ebrahimzadeh, Frede Blaabjerg, Torsten Lund, John Godsk Nielsen, Philip Carne Kjær   +4 more
doaj   +1 more source

Comparison of PLL-Based and PLL-Less Control Strategies for Grid-Following Inverters Considering Time and Frequency Domain Analysis

IEEE Access, 2022
This article presents a comprehensive comparison of three control strategies used for grid-following inverters (GFLIs). The first strategy is the phase-locked loop (PLL)-based vector current control (VCC), and the other two PLL-less controllers are the ...
Nabil Mohammed, Weihua Zhou, Behrooz Bahrani   +2 more
doaj   +1 more source

An alternative current-error based control for VSC integration to weak grid [PDF]

, 2018
An enhanced current control strategy is proposed for voltage source converters for the integration to weak grids. The control derives from the current-error based vector control.
Chen, Dong, Givaki, Kamyab, Xu, Lie, Xu, Yan   +3 more
core   +1 more source

Grid-Connected Converters: A Brief Survey of Topologies, Output Filters, Current Control, and Weak Grids Operation

Energies, 2023
Grid-connected converters (GCCs) are used extensively for the integration of DC power sources with AC power sources. However, since it is a complex topic, there are many possibilities for regulating grid-injected currents, as well as different modulation
Guilherme V. Hollweg, Shahid A. Khan, Shivam Chaturvedi, Yaoyu Fan, Mengqi Wang, Wencong Su   +5 more
doaj   +1 more source

Multi-terminal HVDC grids with inertia mimicry capability [PDF]

, 2016
The high-voltage multi-terminal dc (MTDC) systems are foreseen to experience an important development in the next years. Currently, they have appeared to be a prevailing technical and economical solution for harvesting offshore wind energy. In this study,
Gharehpetian, Gevorg B., Luna Alloza, Álvaro, Rodríguez Cortés, Pedro, Rouzbehi, Kumars, Zhang, Weiyi   +4 more
core   +2 more sources