when the rotor angle becomes negative in PSSE, what does it mean?

asked 2021-07-14 01:52:35 -0500

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I ran a simulation of IEEE 118-bus system in PSSE, and the bus fault was set to take place at t=0.2s and cleared at t=1.0s.

Something strange happened. The rotor angle started to become negative, what does it mean?

Cuz from what I know, the rotor angle is supposed to be between 0~90°.( maybe larger than 90° for some kinds of synchronous machines)

For the unstable condition, is the rotor angle not supposed to be beyond 90°and keep rising？

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answered 2021-07-15 13:10:48 -0500

perolofl

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If relative angles are used in PSSE, the difference between the rotor angle and the reference angle is shown. The reference angle may be a single machine or the average angle for all machines in the system. Negative rotor angles for some machines are normal when using relative angles.

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Asked: 2021-07-14 01:52:35 -0500

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Last updated: Jul 15 '21

when the rotor angle becomes negative in PSSE, what does it mean?

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