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Description

This is a general model of a static excitation system representing a Silicon-Controlled Rectifier. The exciter may be bus fed or solid fed. The model was described in [1] as part of study for load rejection over-voltages. The SCRX component was developed in line with the references [1] [2].

Mask and Parameters

Exciter Parameters

Expanding the "SCRX diagram" displays the block diagram in the parameters window.

Name

Description

Unit

Variable = {Possible Values}

Ta_Tb

Gain reduction ratio Ta/Tb

-

-

Tb

Time constant

s

-

K

Exciter gain

-

-

Te

Time constant

s

-

Emax

Maximum field voltage output

pu

-

Emin

Minimum field voltage output

pu

-

Cswitch

Voltage source switch – Bus fed = 0, Solid fed = 1.

-

[0, 1]

Rc_Rfd

Ratio of the crowbar resistance to field winding resistance Rc/Rfd

-

-

...

NameDescription

Unit

Efd

Exciter output voltage

pu


References

1. F.P. de Mello, L. M. Leuzinger and R. J. Mills, "Load rejection overvoltages as affected by excitation system control," in IEEE Transactions on Power Apparatus and Systems, vol. 94, no. 2, pp. 280-287, March 1975, doi: 10.1109/T-PAS.1975.31853. 

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