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subsystem identifiers range from 0 to 11

asked 2021-04-14 17:36:01 -0500

DanSmith gravatar image

Can somebody explain how a subsystem is different from 0 to 11? I see this statement 276 times in API but couldn't find what each number means. Also, could you please point me where this information is available in API or other document?

Thanks in advance!!

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answered 2021-04-15 10:35:19 -0500

perolofl gravatar image

When defining a bus subsystem with API bsys a subsystem id (SID) between 0 - 11 is selected. This means it is possible to have several subsystem definition at the same time.

In the example below I first define three different subsystems and allocate them to sid 1, 5 and 9 respectively. Thereafter I list the buses in the three different subsystem.

# Area 1 in sid 1:
psspy.bsys(1,0,[ 13.8, 500.],1,[1],0,[],0,[],0,[])
# Area 5 in sid 5:
psspy.bsys(5,0,[ 13.8, 500.],1,[5],0,[],0,[],0,[])
# 230 - 500 kV in sid 9:
psspy.bsys(9,1,[ 230., 500.],0,[],0,[],0,[],0,[])

# List the buses for the three defined subsystems

You can normally use sid = 0 if you are only using one subsystem definition in your script. However, the GUI is using sid=0, so when a script is run inside PSSE and you use sid=0, that definition will be there when the script terminates.

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Asked: 2021-04-14 17:36:01 -0500

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Last updated: Apr 15