Hi all,

I'm new to the area and trying to find out the dynamical response of the terminal voltage of a synchronous generator to a sudden breakdown of a transmission line connecting the generator to a motor, assuming the generator is unregulated and has constant mechanical power supply.

Due to the size of network we are simulating (about 120 nodes (generator/motor) and 200 edges (transmission line)), a simplified model (e.g. a differential equation) capturing the most dominant feature is enough.

Any ideas are welcomed!
ZXZ

 

ETerm = Eq + jITerm*Xd, where:
ETern: Terminal Voltage
ITerm: Terminal current
Eq: Generator's internal Voltage (it could be greater or lower than the terminal voltage depending if it is running over or under excited)
Xd: Synchronous reactance (X'', X', X, depending the span of time you are seeing after the disturbance).

As you can see, if a generator is running overexcited, because you said it has a motor as load, the field voltage is constant (unregulated), after loss the load (for example: 52G open), the terminal voltage will rise up to equal Eq (not as step, because you have the different time constants T''do, T'do).

Regards

 

ZXZ... have you worked with IEEE Std 421, covering "Excitation System Modeling?"

Regards,
Phil Corso