Etki Acilan's profile - activity

I do not know about the ability of PSSE to create a y-bus matrix, however, I believe it is possible to construct the y-bus matrix from the .raw file. The structure of it is similar to IEEE CDF.

Hi, As far as I understand from the API document, snap() function does not save the STORE values, although it saves the STATES. So is there a way to save the STORE vector as well as STATE vector in a snapshot kind of file?

Thank you.

We know that STORE is over-written each time instant. Is there a way to access last STORE and DSTATE values in a dynamic simulation?

We can access the state values by dsrval() function. However, I want to know the STORE value as well. Is it possible?

Thank you!

Thank you @jfconroy, I am editing the topic as 'solved'.

@jfconroy Do I have to provide a derivative to PSS/E? Doesn't it have Differential Algebraic Equations which it can make a transition to next state(k+1)?

Thank you for the answer. The was the thing that came to my mind after RJG@PSM's answer. I think I'll go with this. I think what you suggest will work fine in quasi steady-state operation. During the transient, I think this is the best I can get. Thank you again for the answer.

Thank you for the answer. I am changing the state variable in every timestep. In this case, how do we know the derivative of the state variable? I mean we don't know the diff. algebraic equations corresponding the state variables. Is it OK if we just write something other than 0?

It is defined as 'the values of the corresponding time derivative (DSTATE)' in API. However, I did not get it. Can anyone help?

Thanks.

[Solved] Please read the comments.

Hello, I solved my problem thanks to you. I edited my thread.

Yes,I want to store only the last step. However, I do simulations in small intervals. I use psspy.run(tpause = last_instant + delta_time) for 1000 times for example, and I use each time step's output for something else. I am working on a kalman filter. So, actually, I want to overwrite on .out file.

Hello, I am doing a large scaled simulation. But as the size of the .out file increases, the simulation gets slower. Therefore, I want to get the output of the channels without using .out file. OR I want to make the .out file only store the last time instant's outputs.

Can I do that?? How can I do that?

Thank you very much,

Solution: Thanks to perolofl, I solved my problem.

What I was doing (which was very slow): I was writing my output to .out file then by using dyntools I was reading the last output.

What I am doing now: I am not using any .out file. I am using psspy.chnval() to get the latest output.

Hello,

I want to use dynamic simulation tool of PSS/E for its transition matrix feature. I want to feed xk and get xk+1, x being the state vector. However, as I understood from (/dynamics-variables-time/) topic, it is not possible. I also tried it on my own. When I change a state, the state goes back to its real value at the next time step.

So my question is, how to use PSS/E for its state transition function(or matrix) feature in dynamic analysis?

Thank you.

Hello,

I have a problem with playback function. When i playback some pmu measurements, the voltages are played back correctly. However, frequencies are not played back correctly. It's like frequency deviation lags behind the time and also is not correct.

I generate my own .plb file PMU measurements using the measurements on a specific bus.

Is there something I should change while a I generate my own measurements?

Thanks!!!