Description
This model is based on the IEEEX1 excitation system model [1]. It includes transducer, transient filter, voltage regulator, exciter, and damping feedback models to maintain voltage stability under varying conditions, essential for power system stability studies.
Mask and Parameters
Exciter Parameters
Se(Efd) uses a piece-wise linear function to compute the feedback gain:
| Mathblock | ||||
|---|---|---|---|---|
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--uriencoded--if (Efd < Efd1) \implies Se = \cfrac%7BSe1%7D%7BEfd1%7D \cdot Efd |
| Mathblock | ||||
|---|---|---|---|---|
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--uriencoded--if (Efd > Efd1) \implies Se=Se1 + \cfrac%7BSe2-Se1%7D%7BEfd2-Efd1%7D \cdot (Efd-Efd1) |
Name | Description | Unit |
Tr | Transducer time constant (lag) | s |
Tb | Transient filter time constant (lag) | s |
Tc | Transient filter time constant (lead) | s |
Ka | Voltage regulator gain | - |
Ta | Regulator time constant (lag) | s |
Vrmax | Maximum voltage regulator output | pu |
Vrmin | Minimum voltage regulator output | pu |
Te | Exciter time constant (lag) | s |
Ke | Linear gain of exciter feedback | - |
Efd1 | Field voltage at the first breakpoint | pu |
Se1 | Gain at the first breakpoint | - |
Efd2 | Field voltage at the second breakpoint | pu |
Se2 | Gain at the second breakpoint | - |
Kf | Excitation control system stabilizer gain | - |
Tf | Excitation control system stabilizer time constant (lag) | s |
Initial Values
Efd0 can be manually set by entering a numerical value. It can be set as "=SM1.EFD_Init" if a pu standard or pu fundamental machine is used.
Name | Description | Unit |
Efd0 | Exciter output voltage initial value | pu |
Inputs, Outputs and Signals Available for Monitoring
Inputs
Name | Description | Unit |
|---|---|---|
EC | Output of terminal voltage transducer and load compensation elements | pu |
VUEL | Underexcitation limiter output | pu |
VOEL | Overexcitation limiter output | pu |
Vothsg | Stabilizer output | pu |
VREF | Voltage regulator reference voltage | pu |
Outputs
Name | Description | Unit |
|---|---|---|
EFD | Exciter output voltage | pu |
Reference
[1] Computer representation of excitation systems, IEEE Transactions on Power Apparatus and Systems ( Volume: PAS-87, Issue: 6, June 1968)