A Hybrid Network Model for Small Signal Stability Analysis of Power Systems

Small signal stability analysis in a power system is typically concerned with electromechanical oscillations. For this purpose, it is adequate to model the transmission system using a constant admittance matrix. For torsional oscillations and HVDC interactions, the frequency of interest is much high...

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Bibliographic Details
Published in:IEEE transactions on power systems 2010-02, Vol.25 (1), p.443-451
Main Authors: Karawita, C., Annakkage, U.D.
Format: Article
Language:English
Subjects:
Admittance
Conferences
Dynamic ac network model
Dynamics
Electrical impedance
Frequency
HVDC interactions
HVDC transmission
Hybrid power systems
Matrix converters
Methodology
Networks
Oscillations
Power system analysis computing
Power system modeling
Power system stability
PSCAD
small signal stability
Stability analysis
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Summary:Small signal stability analysis in a power system is typically concerned with electromechanical oscillations. For this purpose, it is adequate to model the transmission system using a constant admittance matrix. For torsional oscillations and HVDC interactions, the frequency of interest is much higher and the constant admittance representation is not sufficient. This paper proposes a hybrid model, which allows the parts of the transmission network in the vicinity of HVDC converters or any other dynamic devices to be modeled with their dynamics and the remaining parts to be modeled as constant admittances. The proposed hybrid methodology for small signal stability assessment is the main contribution of this paper. The proposed methodology is validated against an electromagnetic transient simulation program (PSCAD/EMTDC) using time responses. The proposed model and two other small signal models are compared against each other in the frequency domain using modal analysis.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2009.2036709