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Description
This model is based on the IEEE type AC3 excitation system model described in the 1981 IEEE committee report [1]. The EXAC1 component was developed in line with the references [1] [2]
Mask and Parameters
AVR parameters
Expanding the "EXAC3 diagram" displays the block diagram in the parameters window.
Name | Description | Unit | Variable = {Possible Values} |
Tr | Regulator input filter time constant. This input filter is not part of the IEEE committee report and there are no typical values recommended in [1]. It was added for flexibility. N.B. This parameter can be set to “0” if the filter is not used. | s | 0 < Tr < 0.5 |
| Kr | Constant associated with regulator and alternator field power supply | -- | -- |
Tb | AVR lead-lag numerator time constant | s | 0 < Tb < 20 |
Tc | AVR lead-lag denominator time constant | s | 0 < Tc < 20 |
Ka | AVR filter gain | -- | 0 < Ka < 1000 |
Ta | AVR filter time constant | s | 0 < Ta < 10.0 |
Kf | Excitation control system stabilizer gain | -- | 0 < Kf ≤ 0.3 |
Tf | Excitation control system stabilizer time constant | s | 0.02 < Tf < 1.5 |
VAmax | Maximum regulator internal voltage | pu | 0 < VAmax ≤ 15 |
VAmin | Minimum regulator internal voltage | pu | -15 ≤ VAmin < 0 |
Klv | Gain used in the minimum field voltage limiter loop | -- | -- |
Vlv | Field voltage used in the minimum field voltage limiter loop | pu | -- |
Exciter Parameters
Expanding the "Exciter diagram" displays the block diagram in the parameters window.
Name | Description | Unit | Variable = {Possible Values} |
Ke | Exciter constant related to self-excited field | pu | 0 < Ke ≤ 1 |
Te | Exciter time constant | s | 0.02 < Te < 2 |
Kd | Demagnetizing factor | pu | 0 ≤ Kd ≤ 1 |
Kc | Rectifier loading factor | pu | 0 ≤ Kc ≤ 1 |
| Kn | Excitation control system stabilizer gain | -- | -- |
| EFDN | Value of EFD at which feedback gain changes | pu | -- |
Se2, Se1 | Exciter saturation factor at the corresponding Vex | pu | -- |
Ve2,Ve1 | Exciter voltage for the exciter saturation function | pu | -- |
Initial value tab
Name | Description | Unit | Variable = {Possible Values} |
Ifd0 | Synchronous machine field current initial value | pu | -- |
Efd0 | Exciter output voltage initial value | pu | -- |
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| Name | Description | Type |
Efd | Exciter output voltage | Output |
References
[1] I. C. Report, "Excitation System Models for Power System Stability Studies," in IEEE Transactions on Power Apparatus and Systems, vol. PAS-100, no. 2, pp. 494-509, Feb. 1981.
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