How to start a simulation in steady-state ?

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Antoine Dupuis 2020-9-10

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https://ww2.mathworks.cn/matlabcentral/answers/591847-how-to-start-a-simulation-in-steady-state

评论： Fangjun Jiang 2020-9-14

采纳的回答： Paul

DistributionPowerSystem.slx

Hi everyone,

I have a question regarding how to the start of a simulation in simulink with the steady state signal (voltage in my case) from t=0s.

I have done the power flow initialization as well the steady-state initial state with the help of powergui but I still have a oscillating voltage, power output from the synchronous machine.

Do you have any idea how to get read of this transient ? For instance I'd like to start my simulation at t=0s with the state of t=0.6s

Thanks in advance !

Antoine

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Paul 2020-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/591847-how-to-start-a-simulation-in-steady-state#answer_493270

Is this what you're looking for?

https://www.mathworks.com/help/simulink/ug/saving-and-restoring-simulation-operating-point.html

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Antoine Dupuis 2020-9-13

Hi Paul,

Thank you so much for your help, it works perfectly as you can see:

The blue curve is a simulation stopping at t=0.01s and the red curve is a second simulation starting off with the operating point of the blue curve at t=0.01s. We can see that the junction is continuous.

Success !!

Thanks again,

Antoine

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Fangjun Jiang 2020-9-11

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https://ww2.mathworks.cn/matlabcentral/answers/591847-how-to-start-a-simulation-in-steady-state#answer_493105

In Configuration Parameters, Data Import/Export, you can check and specify "Initial State".

You can also save "States" for your simulation. Do this first to figure out what are the states and their order and values.

In recent versions, there are "State Reader" and "State Writer" blocks. R2018a may not have it.

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Antoine Dupuis 2020-9-11

编辑：Antoine Dupuis 2020-9-11

Hi again Fangjun Jiang,

I'm very sorry if I don't understand what you explaining, but it seems to me that we are saying the same things. Indeed, from my curves I don't have SS (steady-state) values of the system states at t=0s. That is my problem.

If I undestand well, you advise me to read the states of my system via the state-reader block in order to find their value corresponding to a time at which the system seems to be in SS, and then simulate again using this new found state values as initial state of my system. If I'm correct, this is what I'm doing but using the very pactical steady-state manager which gives me all states values at a chosen time (that I chose corresponding to a SS system t=3s) and allow me to initialize my system with this new found. Yet I obtained the curves I showed you that don't show expected result.

Plus from this description of state-reader block (https://fr.mathworks.com/help/simulink/slref/statereader.html) it seems that I can't use it with Simscape blocks (as I'm working on power system).

Kind Regards

Antoine Dupuis 2020-9-14

Hi Fangjun Jiang,

From what I have read in mathwork, your method works perfectly indeed, but is limited in certain cases (including mine) because of specific block type.

This is very well explained here:

https://fr.mathworks.com/help/simulink/slref/saving-and-restoring-simulation-operating-point.html

Great talking

Regards,

Antoine