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

snapshot
1 ●7 ●8 ●7

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？

add a comment

1 answer

Sort by » oldest newest most voted

answered Jul 15 '1

perolofl

3452 ●1 ●9 ●20

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.

link

add a comment

Question Tools

2 followers

Stats

Asked: Jul 14 '1

Seen: 714 times

Last updated: Jul 15 '21

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

1 answer

Your Answer

Question Tools

Stats

Related questions