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

Question

Urban Rudez 2022-2-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1646310-how-to-calculate-electromechanical-modes-from-simulink-power-system-model

回答： Riya 2024-1-23

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!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Riya 2024-1-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1646310-how-to-calculate-electromechanical-modes-from-simulink-power-system-model#answer_1395046

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:

https://www.mathworks.com/matlabcentral/answers/6621-electromechanical-actuator?s_tid=answers_rc1-2_p2_MLT