Generator Models

Round Rotor Generator

The round rotor generator necessitates the following parameters:

Parameter

 Units

Description

Rated MVA

MVA

 

Rated Efficiency

Percent

 

Rated Speed

RPM

 

Rated Voltage

Volts LL

 

Rated Current

Amps

 

Rated PF

 

 

Ra

pu

Armature Resistance

Xd

pu

D-Axis Synchronous Reactance

Xq

pu

Q-Axis Synchronous Reactance

X’d

pu

D-Axis Transient Reactance

X’q

pu

Q-Axis Transient Reactance

X’’d = X’’q

pu

D & Q-Axis Sub-Transient Reactance

Xl

pu

Stator Leakage Reactance

T’do

Seconds

D-Axis Transient OC Time Constant

T’qo

Seconds

Q-Axis Transient OC Time Constant

T’’do

Seconds

D-Axis Sub-Transient OC Time Constant

T’’qo

Seconds

Q-Axis Sub-Transient OC Time Constant

E1

pu

First Voltage to Define Saturation

E2

pu

Second Voltage to Define Saturation

S( E1 )

pu

Saturation at E1

S( E2 )

pu

Saturation at E2

H

kW-Sec / kVA

Combined machine and prime mover inertia

D

pu

Machine damping, normally = 0

Note: OC = Open Circuit.

These are standard machine quantities, and are based upon a sub-transient level detail flux model. All machine data shown above is mandatory for modeling the round rotor generator properly.

Salient Pole Generator

The salient pole generator necessitates the following parameters:

Parameter

Units

Description

Rated MVA

MVA

 

Rated Eff

Percent

 

Rated Speed

RPM

 

Rated Voltage

Volts LL

 

Rated Current

Amps

 

Rated PF

 

 

Ra

pu

Armature Resistance

Xd

pu

D-Axis Synchronous Reactance

Xq

pu

Q-Axis Synchronous Reactance

X’d

pu

D-Axis Transient Reactance

X’’d

pu

D-Axis Sub-Transient Reactance

Xl

pu

Stator Leakage Reactance

T’do

Seconds

D-Axis Transient OC Time Constant

T’’do

Seconds

D-Axis Sub-Transient OC Time Constant

T’’qo

Seconds

Q-Axis Sub-Transient OC Time Constant

E1

pu

First Voltage to Define Saturation

E2

pu

Second Voltage to Define Saturation

S( E1 )

pu

Saturation at E1

S( E2 )

pu

Saturation at E2

H

kW-Sec / kVA

Combined machine and prime mover inertia

D

pu

Machine damping, normally = 0

Note: OC = Open Circuit.

Again, these are standard machine quantities, and are based upon a sub-transient level detail flux model. All machine data shown above is mandatory for modeling the salient pole generator properly.

More Information

Dynamic Stability  
Stability Data Parameters