Search for machine by Id

asked 2025-07-31 08:08:35 -0500

TheNewGuy
11 ●1 ●1 ●3

Hello! I am brand spanking new, so thank you in advance for your patience and help.

I am attempting to create a Python script which will search for and print out all machines which share specified Id names. Eventually, I will want these machines to be added to a bus subsystem.

Just to be specific (again, brand new), I am on the Machine tab of the Network Data tab and have a list of machines...some of which have a similar Id value which I would like to grab:

machine bus number
bus name
Id
PGen value
PMin and
PMax.

I've been looking through the documentation and I have not found anything which suggests Id is a searchable index. Any suggestions or help would be awesome. I'm trying to start simple, by printing out all machine buses with a specific Id designation. Any suggestions?

Thank you!

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3 answers

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answered 2025-08-19 04:37:12 -0500

abdul

58 ●18 ●19 ●25

updated 2025-08-19 04:54:18 -0500

Not sure if I understood the requirement correctly, but here's the code:

import collections

ierr, (machnum, ) = psspy.amachint(sid=-1, flag=1, string = 'NUMBER')
ierr, (machid, machname) = psspy.amachchar(sid=-1, flag=1, string = ['ID', 'NAME'])
ierr, (pgen, pmin, pmax, ) = psspy.amachreal(sid=-1, flag=1, string = ['PGEN', 'PMIN', 'PMAX'])

# remove white spaces
machid = [i.strip() for i in machid]
machname = [i.strip() for i in machname]

# group machines by ID
machines_by_id = collections.defaultdict(list)
for num, name, mid, pg, pmn, pmx in zip(machnum, machname, machid, pgen, pmin, pmax):
    machines_by_id[mid].append((num, name, pg, pmn, pmx))

# print only machines with same IDs
for mid, mach_list in machines_by_id.items():
    if len(mach_list) > 1:
        print(f"\nMachines with ID '{mid}':")
        for num, name, pg, pmn, pmx in mach_list:
            print(f"  Bus {num}, Name {name}, Pgen = {pg:.2f} MW, Pmin = {pmn:.2f} MW, Pmax = {pmx:.2f} MW")

# function to create subsystem of buses which have at least one machine with the required/defined ID
def create_subsystem(mid):

    if mid.strip() not in machines_by_id:
        print(f"No machines found with ID {mid}")
        return

    buses = [num for num, _, _, _, _ in machines_by_id[mid]]
    ierr = psspy.bsys(0, 0, [0.0, 999.0], 0, [], len(buses), buses, 0, [], 0, [])
    if ierr == 0:
        print(f"Subsystem created for machines with ID '{mid}': {buses}")
    else:
        print(f"Error creating subsystem for ID '{mid}', ierr={ierr}")

# create subsystem 
mid = '1'
create_subsystem(mid)

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answered 2025-08-18 13:37:26 -0500

TheNewGuy
11 ●1 ●1 ●3

updated 2025-08-18 13:38:55 -0500

likethevegetable, your link was helpful, but a bit over my head. I'm still very new to PSSE, so chances are I'll be doing everything the less-than-ideal way before settling into a more streamlined routine.

That being said, this is how I called the amachchar() function and got it to return a list (carray_ID) of ID tags for each machine:

ierrID, carrayID = py.amachchar(-1, 4, 'ID')

**Edit: I don't know why, but the post isn't showing the underscore in ieerID and carrayID...but there is an underscore right before the ID portion of the variable name.

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Hi @TheNewGuy, The underscores sometimes automatically change into italic. You can use highlight these lines and click the code button (the one with 101010) and that should show them correctly