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Frequency-dependent cable modelling for small-signal stability analysis of VSC-HVDC systems

Beerten, Jef; D'Arco, Salvatore; Suul, Jon Are Wold
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2495291
Date
2016
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  • Institutt for elkraftteknikk [1559]
  • Publikasjoner fra CRIStin - NTNU [19849]
Original version
IET Generation, Transmission & Distribution. 2016, 10 (6), 1370-1381.   10.1049/iet-gtd.2015.0868
Abstract
State-of-the-art time-domain models of power cables account for the frequency dependency of physical parameters to enable accurate transient simulations of high-voltage transmission schemes. Owing to their formulation, these models cannot be directly converted into a state-space form as required for small-signal eigenvalue analysis. Thus, dc cables are commonly represented in high-voltage direct current (HVDC) power system stability studies by cascaded pi-section equivalents that neglect the frequency-dependent effects. This study demonstrates how the conventional cascaded pi-section model is unable to accurately represent the damping characteristic of the cable and how this can lead to incorrect stability assessments. Furthermore, an alternative model consisting of cascaded pi-sections with multiple parallel branches is explored, which allows for a state-space representation while accounting for the frequency dependency of the cable parameters. The performance of the proposed model is benchmarked against state-of-the-art cable models both in the frequency domain and in the time domain. Finally, the study provides a comparative example of the impact of the cable modelling on the small-signal dynamics of a point-to-point voltage-source converter (VSC) HVDC transmission scheme.
Publisher
Institution of Engineering and Technology (IET)
Journal
IET Generation, Transmission & Distribution

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