Arvin's profile - activity

you can use CRANI model which is series reactor model. you can probably give negative value for x to define it as series capacitor.

To complete the previous answer, I have also realized that pss/e uses a 3rd order median filter, after doing the derivative. the output of the median filter then goes to a low path filter, with time constant of Tf, defined as Dynamic solution parameter.

Thanks for your answer.

Hello,

I was wondering if it is possible to run a dynamic simulation for a network which you have a generator defined in the *.raw file while no dynamic data is provided for it in the *.dyr file.

Regards, Arvin

Thanks, Yes the problem is exactly what you have mentioned. I decreased the rating of induction machine to 1MVA and now everything is fine.

Thanks perolofl, Actually I was using CIMTR3 type induction machine which is defined as generator in *.raw file. and i was able to finally change its status using "machine_data_2(i=1, id='1', intgar1=1)" command.

Hello,

I want to simulate starting of induction machine, CIMTR3 using PSS/E. In this way, I have made a simple test-case (attached) and the scenario is to change the status of the CIMTR3 from OFF to ON at t=1sec using the following code:

psspy.machinedata2(i=1, id='1', intgar1=1)

Note: time step=0.001 sec.

I am able to successfully run this test-case with in python, but I see oscillation in TELEC & QMOTOR of CIMTR3 which seems to me as numerical issue probably caused by bad data.

In this way, does anybody have any good test-case for starting of CIMTR3 machine or can anybody help me to modify the attached data to have numerically stable results without any oscillations?

Attachments:

net.raw.jpg

dyn.dyr.jpg

Note: To have the data, please replace *.jpg extension with *.raw for the first file and with *.dyr for the second one.

Thanks,

Arvin

Hello,

i am trying to change the status of an induction machine, using "immod_status" in dynamic simulation. but i see the following error when running the python script:

psspy.immodstatus(1, '1',1); File ".\psspy.py", line 42521, in immodstatus TypeError: function takes exactly 4 arguments (3 given)

while based on psse documentation, in python, the immod_status gets just three input, not four!

anybody can help me with this.

Thanks, Arvin

Hello,

I have a psse .raw file for ieee118 bus test case with a converged power flow solution and i am going to create dynamic data (.dyr) file considering just GENROU type synchronous machines.

to begin, i looked at PSS/E documentation and there i found valid range for parameter values of GENROU. based on this, i generated a dynamic data file but it seems that it is not enough since i have come to a case which all my parameter are in the range of PSS/E while the dynamic simulation is not stable!

Are there other considerations and assumptions that i need to make in order to have meaningful and stable dynamic simulations?

Thanks, Arvin

Hello,

I am looking for an python API command by which i could change tap position during dynamic simulation. I found TWOWINDINGCHNG_4 command, but i think this is for changing transformer data for power flow. please help me with this.

Thanks, Arvin