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Is manually switching between powerflowmode and dynamics mode necessary when simulating contingencies?

asked 2020-12-23 20:14:55 -0500

boat14 gravatar image

updated 2020-12-23 20:15:47 -0500

Is it necessary to sandwich "powerflow" commands between powerflowmode() and dynamicsmode() commands when simulating dynamics contingencies?

For example, say I have a bus fault and want to disconnect the bus after the fault:

psspy.run(0, 1)

# Apply fault
psspy.dist_bus_fault(111111, _i, _f, [0.0, -0.2E+10])

# Run 6 cycles
psspy.run(0, 1.1)

# Clear fault
psspy.dist_clear_fault(1)

psspy.powerflowmode()    # Switch to powerflow mode Is this necessary?

# Disconnect bus
psspy.dscn(111111)

psspy.dynamicsmode(1)    # Switch back to dynamics mode, with factorizing. Is this necessary?
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answered 2020-12-30 16:08:28 -0500

likethevegetable gravatar image

updated 2020-12-30 16:09:17 -0500

That's a good question, I haven't seen or used those API calls before and have not had issues... My initial hunch tells me that psspy.powerflowmode() is necessary if you are affecting the network in a way that changes the admittance matrix values, for example, changing a converted load's power. I will investigate that when I have time and update my answer.

You can use this command to disconnect the bus instead, and confidently not use those comands: ierr = psspy.dist_bus_trip(ibus)

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Asked: 2020-12-23 20:14:55 -0500

Seen: 117 times

Last updated: Dec 30 '20