Programmable Parameters

ge_Xtfo, ge_Rtfo	These parameters are null when the output voltage of the generator is regulated; they represent the leakage reactance and the copper losses of the transformer when the voltage on the high-voltage side of the step-up transformer is regulated.
ge_Xl	Armature leakage reactance (Xl) (pu)
ge_Ra	Armature resistance (Ra) (pu)
ge_Xd	Direct synchronous reactance (Xd) (pu)
ge_Xd1	Direct transient reactance (Xd') (pu)
ge_Xd2	Direct sub-transient reactance (Xd”) (pu)
ge_Xq	Quadrature synchronous reactance (Xq) (pu)
ge_Xq1	Quadrature transient reactance (Xq') (pu)
ge_Xq2	Quadrature sub-transient reactance (Xq”) (pu)
ge_Td01	Direct axis transient time constant (Tdo') (s)
ge_Td02	Direct axis sub-transient time constant (Tdo”) (s)
ge_Tq01	Quadrature axis transient time constant (Tqo') (s)
ge_Tq02	Quadrature axis sub-transient time constant (Tqo”) (s)
ge_Tdif	Differentiation time constant (default value = 0.0001s)
ge_SatOn	Saturation (1 = yes / 0 = no)
ge_Ifdmin	Lower limit of Ifd. To prevent Ifd from taking a negative value, set ge_Ifdmin= 0 (pu)
ge_Ifdmax	Upper limit of Ifd (pu)
ge_eu, ge_el, ge_sgu, ge_sgl	Parameters used to generate saturation curve as follows:

See Figure 5 - 9 (pu).

Figure 5.9 Generator saturation curve

The saturation is considered linear from 0 to 0.8 pu of Vt (terminal voltage).

If

Where:

(Field current, pu)

a and b are found with some iteration, and are: