Symbol

Description

Value

Ra

Armature resistance, the typical range is 0.0 < Ra < 0.01

0.002 Ω

X_d

D-axis armature reactance (p.u)

2.22

X_q

Q-axis armature reactance (p.u)

1.1

X_d^’

D-axis transient reactance (p.u)

0.37

X_q^’

Q-axis transient reactance (p.u)

1.099

X^”

Machine sub-transient reactance (p.u)

0.215

XI

leakage reactance (p.u)

0.10

H

Inertial time constant of the shaft and turbine

1.54 kg/m²∙s

D

load damping coefficient

0

T_d0’

d-axis open circuit transient time constant

12.1 sec

T_d0”

d-axis open circuit sub transient time constant

0.06 sec

T_q0’

q-axis open circuit transient time constant

0.2 sec

T_q0^”

q-axis open circuit sub transient time constant

0.06 sec

S₁₀

Saturation factor at a voltage = 1 p.u

0.15

S₁₂

Saturation factor at a voltage = 1.2 p.u

0.46