Modeling and analysis of VSC-based HVDC systems for dc network stability studies
Artikel i vetenskaplig tidskrift, 2016

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.


dc-side power dependent admittance

dc-network resonance


dc-network stability


Gustavo Pinares

Chalmers, Energi och miljö, Elkraftteknik

Massimo Bongiorno

Chalmers, Energi och miljö, Elkraftteknik

IEEE Transactions on Power Delivery

0885-8977 (ISSN) 1937-4208 (eISSN)

Vol. 31 2 848 - 856 7154511




Annan elektroteknik och elektronik



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