Simulink Power System Model Linearization using Linear Analysis Tool

Question

Radu 2016-11-8

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https://ww2.mathworks.cn/matlabcentral/answers/311176-simulink-power-system-model-linearization-using-linear-analysis-tool

评论： Nyam Jargalsaikhan 2021-8-12

Dear All,

I am using Matlab/Simulink 2016b to analyze power system stability. At the moment I am mainly interested in small signal stability which requires the system to be linearized around an operating point. For that I am using Simulink's Linear Analysis Tool.

My question is regarding the way linearization is carried out. I will try to ask the question by giving an example: - I have opened the Simulink model power_PSS which simulates the 2 area system described in the book Power System Stability and Control by Kundur. - I have linearized this model and verified the linear system response to the non-linear system response. They match quite well. - I have built my own Type 4 wind turbine model (that can run in phasor type simulations) and I have created a subsystem of my model. (this model is also linearizing correctly).

- next I have connected my model to the power_PSS model. The simulation is running and the results are as I expected. - Now, if I put my wind turbine model inside let's say Area 2 subsystem of the power_PSS model, the linearization is different than if I keep the wind turbine model outside the Area 2 subsystem. NOTE that in both cases I connect my model to the same BUS of the power_PSS model.

So my question is: Is there a rule on how/where the subsystems should be placed in a model in order to the linearization tool to properly linearize? I mention that in the second case, when the wind turbine model is outside of Area 2 the linear system response matches pretty well the non-linear response. In the first case they do not match.

Thank you all in advance for taking the time to read my question.

Best regards, Radu

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SinanB 2017-5-19

I would be also interested to hear the answer to this question!

Awak Mathok 2021-5-10

Hello there, it might be a litle while ago but I need help in linearizing two area power system (power_PSS) same one yopu used for my research and am not able to generate all the state matrices. I am getting matrix A but B,C and D comes empty. I am using linmod to find my matrices. what do I need to do or which method can I use to get an answer?

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