How to calculate electromechanical modes from Simulink power-system model?

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Urban Rudez
Urban Rudez le 9 Fév 2022
Réponse apportée : Riya le 23 Jan 2024
Dear colleagues!
I have a power-system model in Simulink, built using Simscape library. The model includes several simplified synchronous machines, pi-section lines and impedance loads. I successfully perform load-flow calculations and time-domain simulations using Discrete phasor simulation type. Now I am interested in getting electromechanical modes of this model (frequencies in the range between 0.3 and 3 seconds). How do I do that? By using Model Linearizer I am able to obtain A, B, C and D matrices, but the eigenvalues of A matrix do not show frequencies I expect (they are much lower, in the range of 1e-4). Just in case I tried the same procedure on a Kundur 2-area model (power_PSS) in which electromechanical modes are known, but I am still having same problems.
I would appreciate any kind of support!

Réponses (1)

Riya
Riya le 23 Jan 2024
Hi,
Calculating the electromechanical modes of a power system in Simulink involves linearizing the nonlinear model around a stable operating point and then analysing the eigenvalues of the resulting linear state-space model.
You can follow the steps below:
  • Simplify the Model: Simplify the model to isolate the electromechanical dynamics if possible. Remove or replace elements that contribute to fast dynamics that are not of interest.
  • Consider using specialized modal analysis tools that are designed for power system stability analysis, such as Power System Analysis Toolbox (PSAT) or commercial software like PSS/E, which may offer more robust calculation of electromechanical modes.
For more information you can refer following article for more information:

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