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The .Out file may be already open when you are trying to run the simulation. Psse won't overwrite the file if it is open.

If you have SVCs and/or Statcoms in the case, plot their output. Their Q may be changing during initialization.

The renewable generator has the following models 1. REGCA1- Generator model 2.REECA1- Generator electrical control model 3. REPCA1- Plant controller model Other two models are aerodynamic model and drive train model for wind machines. The electrical control model pertains to the electrical control of an individual renewable machine . With this model we can control the active and reactive power, voltage and power factor of the machine. REPCA1 is plant controller model and it controls the P,Q,V and pf depending upon the status of control flags. The machine (s) can ,if modeled for voltage contro,l control the terminal bus or a remote bus. Usually the plant controller control the voltage at a remote bus (HV or MV). Use proper flags and bus numbers in REECA1 and REPCA1 along with gains and time constants for achieving this.

More info, such models, load flow model configuration and suspect states if any, is required for answering the second question. Hope this helps.

You can use psas code or batch command in the idev file, if any, is being used for the dynamic simulation. Consult PSAS guide and/or API guide for the PSSe.

Perhaps the R and X values are big changes from PSSE solution point of view. Try modelling the branch with high R and X values and then reduce these gradually in small steps till you reach the desired values.

Is the module psspy being used in temp? Could it be that psspy used in temp (if that is the case) cause that error?

The units for the speed deviation are per unit based on rad/s.

I am trying to run the psse using python script provided below. However, the trace back says unable to find module psspy. The psspy.dll is present in PSSBIN. The paths are correct and I have tried many variations of the code but it doesn't work. I would really appreciate any help.

import os import sys PSSEPATH=r'C:\PROGRA~2\PTI\PSSE30\PSSBIN' sys.path.append(PSSEPATH) os.environ['PATH']=os.environ['PATH']+';'+PSSE_PATH os.chdir(r'c:\users\xxxx\desktop\python scripts') import psspy import redirect

Error message

Traceback (most recent call last): File "ps2py.py", line 7, in <module> import psspy ImportError: No module named psspy