psse_user_88's profile - activity

I tried using CIM5BL with the following parameters : 154 'CIM5BL' 1 1 0.0048, 0.0744, 2, 0.0163, 0.0814, 0.0043, 0.0470, 0, 0, 0, 0, 8.8680, 0, 2.3960, 0.2, 12, 4, 2, 0.35/ and added the model to savnw.sav at node 154.

Thank you Perolofl. It worked by reducing the DELT value to 1ms.

Thank you Perolofl, could you provide some typical model data, I am trying with some data but the model is not converging after adding CIM5BL dynamic load in PSS/E.

Hello,

I would like to model in one of the buses in my study case, a very large electrical compressor motor of 10MW. Can I use the ZIP model for modelling of this motor as load for dynamic simulation. I will oberserve the voltage drop in case of short circuit in nearby nodes and frequency drop?

Any advice if this is enough accurate? I am thinking of this because using the CIM5BL or other induction motor models would need a lot of parameters which I don't have.

Thank you

great, thank you.

Hello,

Up to now, I have used this script for creating 24 cases in PSSE(one day), using python to read load, generation, branches status, choose swing node for different scenarios ect.

https://drive.google.com/file/d/1fiOUOSUqiIUZA8tkIkxnKBwclqYNjmCs/view?usp=sharing (link text)

I need to make the following updates to my script:

1. create a table for reporting the convergence status of each case. is there a command to retrieve for each run of power flow, the messages whether the case did converge or not? I mean to retrieve the part "reached tolerance..in 5 iterations"

This would help, so the user at the end of the run of the script will know if any case did not converge.

Thank you

I was able to solve by removing loaddatalst. The for row loop had done the splitting already. Thank you JConto

please see updated code. I am getting: loaddatalst = row.split(",") AttributeError: 'list' object has no attribute 'split'

Thank you JConto, I am getting this error: Traceback (most recent call last): File "C:/path/lexon.py", line 28, in <module> for row in reader: ValueError: I/O operation on closed file Is it indentation issue?

Hello, I am trying to make a script in python that reads from CSV files the load and generation values and updates the values in the PSS/E sav case for one timestamp. csv file structure for load looks like this:

node number, load MW, load Mvar 10004, 5, 5 10006, 5, 5 . . .

The status of the script is as follows:

import os
import sys

PSSE_LOCATION = r"C:\Program Files (x86)\PTI\PSSE33\PSSBIN"
sys.path.append(PSSE_LOCATION)
os.environ['PATH'] = os.environ['PATH'] + ';' + PSSE_LOCATION

import psspy
_i = psspy.getdefaultint()
_f = psspy.getdefaultreal()
_s = psspy.getdefaultchar()
psspy.psseinit(100000)
psspy.throwPsseExceptions = True

STUDY_CASE = 'C:\\path\\20220301_0030_FO1.sav'

psspy.case(STUDY_CASE)
#My updated code is below, changed identation
with open("1.csv", 'r') as file:
    reader = csv.reader(file)
    for row in reader:
        loadbus = int(row[0])
        loadid = '1'  # or loaddatalst [x], x is position of load id in row
        loadp = float(row[1])
        loadq = float(row[2])
        psspy.load_data_4(loadbus, loadid, [_i, _i, _i, _i, _i, _i], [loadp, loadq, 0, 0, 0, 0])


psspy.fnsl([0, 0, 0, 0, 0, 0, 99, 0])
psspy.area_2(0, 1, 1)
psspy.save(STUDY_CASE)
psspy.rawd_2(0, 1, [1, 1, 1, 0, 0, 0, 0], 0, r"""20220301_0030_FO1.raw""")

The part I am struggling with is defining some way of importing the CSV list in python and applying the load (MW/Mvar) in each load node.

Thank you.

to follow up after JConto answer, my code for updating load and generation in PSSE case looks like this:

#read load p and q
with open('load.csv', 'r') as file:
reader = csv.reader(file)
for row in reader:
   loadbus = int(row[0])
   loadid = '1'  # or loaddatalst [x], x is position of load id in row
   loadp = float(row[1])
   loadq = float(row[2])
   psspy.load_data_4(loadbus, loadid, [_i, _i, _i, _i, _i, _i], [loadp, loadq, 0, 0, 0, 0])

#read generators
with open('gen.csv', 'r') as file:
reader = csv.reader(file)
for row in reader:
    genbus = int(row[0])
    genid = str(row[1])  # or loaddatalst [x], x is position of load id in row
    status = int(row[2])
    genp = float(row[3])
    genq = float(row[4])
    psspy.machine_chng_2(genbus, genid, [status, _i, _i, _i, _i, _i],[genp, genq, _f, _f, _f, _f, _f, _f, _f, _f, _f, _f, _f, _f, _f, _f, _f])

Hi,

I have to perform short circuit calculations, and I was looking at the parameter of "Breaker contact parting time" in the IEC 60909 Fault calculation window. what is the meaning of this value, I assume it is fault clearing time, let's say that for my system in the grid code I have clearing time of 200milisendos for short circuits, should I put there 0.2s?

Thank you

Thank you JConto, I was able to run the idv file. My question now is how do I make the rdchtest.idv read from excel the columns of P and Q for the Load?

Hi JConto,

I am not able to perform the actions you suggest, maybe you have some example or the script in IDV, because i tried running your example, but I can't get it how to enter the data in RDCH format, normally they should be imported from excel?

I have to say I am quite new in scripting and python ect, just used PSSE v.33 from its interface.

Thank you for your support