How i can do dynamic simulation and find Critical Clearing Time in PSS/E?

answered 2021-05-19 08:50:27 -0500

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updated 2021-05-19 10:57:33 -0500

Maybe you are isolating the generator bus from the rest of the system when you trip a line (or transformer?) at fault clearing? Or you are splitting the system into two separate systems?

EDIT: Maybe you are not doing anything wrong. It is a small test system and it might be that all generators are accelerating similarly for some fault locations and synchronism is maintained even for long fault clearing times. Plot the speed deviation for all generators and see if they are following each other.

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The network I use is ieee 14 bus. When I trip a line at fault clearing, there is another line that connects this bus with the rest of the network.

dsam ( 2021-05-19 09:31:05 -0500 )edit

I plotted the speed deviation for all generators and i noticed that they are not following each other when the fault occurs in a generator bus and the network is asynchronous.

dsam ( 2021-05-19 14:37:21 -0500 )edit

Exactly, this shows that there are fault locations where no generator will go out of step. It is best seen in the rotor angles but also in speed. Nothing is wrong with the results.