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Modeling and analysis of VSC-based HVDC systems for dc network stability studies

Gustavo Pinares (Institutionen för energi och miljö, Elteknik) ; Massimo Bongiorno (Institutionen för energi och miljö, Elteknik)
IEEE Transactions on Power Delivery (0885-8977). Vol. 31 (2016), 2, p. 848 - 856.
[Artikel, refereegranskad vetenskaplig]

A modeling approach is presented in this paper in order to investigate instabilities originated from dc-network resonances in Voltage-Source Converter HVDC (VSC-HVDC) systems. Through frequency domain modeling, it is shown that the VSC-HVDC system can be represented as a feedback interconnection of two subsystems. These subsystems are defined in this paper as a dc-network impedance connected to a VSC dc-side power dependent admittance. The conditions in which this admittance has a negative conductance are investigated since they can amplify dc-network resonances. It is found that, when the VSC that controls the direct-voltage injects power into the dc network, the mentioned conductance becomes negative above certain frequencies. In addition, the impact of weak ac grids, control system delays, and other direct-voltage controllers on the studied conductance are investigated. The theoretical findings are verified through time-domain simulations.

Nyckelord: VSC-HVDC, passivity, dc-network stability, dc-side power dependent admittance, dc-network resonance

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Denna post skapades 2015-07-17. Senast ändrad 2016-04-29.
CPL Pubid: 219770


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Institutioner (Chalmers)

Institutionen för energi och miljö, Elteknik



Chalmers infrastruktur

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Denna publikation ingår i:

Analysis of dc-network stability of VSC-based HVDC grids