Separately-Excited Exciter
Electro-machine or thyristor excitation with independent power supply.
Description
Unit Separately-Excited Exciter is an electromachine excitation or thyristor excitation with independent power supply. The unit Separately-Excited Exciter can be used as an exciter in a synchronous generator model with the control system shown in the diagram.
The Self-Excited Exciter mathematical model is shown in the diagram.
In this diagram
-
- is the equivalent time constant of the exciter;
-
- output voltage of the automatic excitation regulator;
-
- excitation voltage.
Ports
Input
#
Vr
—
input voltage value from the excitation regulator
scalar
Details
Input voltage value from the excitation regulator in relative units.
| Data types |
|
| Complex numbers support |
No |
Output
#
Efd
—
excitation voltage output
scalar
Details
The output value of the excitation voltage applied to the excitation circuit of a synchronous machine, in relative units.
| Data types |
|
| Complex numbers support |
No |
Parameters
Main
# Exciter field time constant T_e, s — exciter time constant
Details
Exciter time constant, in seconds.
Usually the exciter time constant value for the electric machine excitation system is 0.3-0.5 s, for thyristor excitation system - 0.02-0.04 s.
| Default value |
|
| Program usage name |
|
| Evaluatable |
Yes |
# Limits exciter voltage output [Efd_max Efd_min], pu — excitation voltage output value limits
Details
The maximum and minimum output value of the excitation voltage applied to the field circuit of a synchronous machine, in relative units.
When modelling an electric machine excitation system, it is necessary to set the minimum output value to 0 as it does not allow the sign of the excitation voltage to change.
| Default value |
|
| Program usage name |
|
| Evaluatable |
Yes |
Initial Values
# Initial field voltage Efd0, pu — initial value of excitation voltage
Details
Initial value of the excitation voltage in relative units.
| Default value |
|
| Program usage name |
|
| Evaluatable |
Yes |