VISHNU's profile - activity

Thanks @perolofl.. Much appreciated....This worked well..

Thanks @perolofl.. Much appreciated....This worked well..

Hi,

Can somebody please let me know how to process an scfile from the ascc3 file. I am trying to obtain individual contribution from generators during a 3ph fault and used ascc3 for creating an scfile. However, I am not able to retrieve the information from it as it seems like a binary file. Is there a python script available to process this scfile or alternatively any APIs which can provide the individual generator contribution during a fault. I have checked ascc_currents but unfortunately it won't give information on other bus contribution.

Any help will be greatly appreciated

Thanks

 ierr, variableNumber = psspy.mdlind(busNumber, 'machine id', 'GEN', 'VAR')
 psspy.var_channel([-1,variableNumber],"variableName")

Here the first command stores the first variable 'VAR' associated with GEN into the variable varname. The second command add the channel corresponding to the variable variableNumber. You can use this commands to get any variable associated with any components.

For instance, If you want to store the second variable then,

 psspy.var_channel([-1,variableNumber+1],"anotherVariableName")

Hope this helps

I think, for voltage response test, you can use an ideal transformer at the point of interest and change the taps after each pause in dynamic simulation. This would effectively change the voltage at the point of interest.

Hi All,

The dyr file once loaded using the python command is getting locked after performing two simulations. (I have used the command psspy.dyre_new([1,1,1,1],'fileName',"","","") to load the dyr file in).

Hence, I am not able to edit the dyr file without restarting the python kernal. Is there any way to unload the dyr files and clear memory using some python commands? I couldn't find anything in the API document.

Thanks in advance

Hi all,

I couldn't find any explanation on the MAXEX1 (over excitation limiter) on the PSSE documents.

Can anyone tell me what does the variable EFD_DES stands for?

What I understood is that it is the contant which should be multiplied with the rated EFD to get the limiting value of EFD (pu of rated) below which the MAXEX1 doen't operate. For example, if the rated EFD=3.3pu and EFD_DES=0.318, then the EFD limit is 1.05 pu of the rated EFD. Is this correct?

Thanks in advance.

Hi All,

I have been using the VTGTPAT overvoltage relay for tripping a synchronous machine in the PSS/E model.

/**MINS model M M+1 M+2 VL VU TP TB

1 'VTGTPAT' 462042 462042 1 0.1 1.3 0.5 0.1 /

It worked fine initially ( zero error message in dat file and triped the machine when the voltage exceeds the threshold). The network setup is - synchronous machine connected to an infinite bus ( represented as an large machine (10000 MVA) bus behind a thevenin impedance R=0.004, X=0.04) with a playback generator connected at the point of connection (POC) to alter the connection point voltage.

When I added an extra wind turbine model at the POC, the VTGTPAT started showing error messgaes as follows

*"Model VTGTPAT Model Instance 1: Invalid machine ID 99999 specified in ICON(M+2)

Model VTGTPAT Model Instance 1: Generator not found -- MODEL IGNOREDD"*

I have cross checked the machine id for ICON(M+2) in the dyr file but its not 99999 . I have also checked for any syntax errors but there isn't one.

Has anyone faced similar issues or have any solutions for the problem mentioned?