Exciter Model: EXDC4
AutoCorrection Properties
Following checks and corrections are applied during Validation and AutoCorrection.
- If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
- If 0 < Tf1 < Mult*TimeStep then Tf1 = Mult*TimeStep
- If Kv = 0 then Kv = 0.02
- If Kr = 0 then Kr = Mult*TimeStep
- If Vrmax < Vrmin then swap the values
Mult represents the user-specified value Minimum time constant size as multiple of time step option on the Validation page of the Transient Stability Dialog
TimeStep represents the integration time step being used as described on TimeStep
Following treatment is handled during the transient numerical simulation
- If Vr > Vrmax, then Vrmax = Vr or if Vr < Vrmin, then Vrmin = Vr
Model Equations and/or Block Diagrams
Parameters:
| Kr | Verr deadband. If Kr is not zero, the voltage regulator input changes at a constant rate if Verr > Kr or Verr < -Kr. If Kr is zero, the error signal drives the voltage regulator continuously. |
| Trh | Rheostat time constant, sec |
| Kv | Fast raise/lower contact setting |
| Vrmax | Maximum control element output, pu |
| Vrmin | Minimum control element output, pu |
| Te | Exciter time constant, sec |
| Ke | Exciter field resistance line slope margin, pu |
| E1 | Field voltage value, 1 |
| SE1 | Saturation factor at E1 |
| E2 | Field voltage value, 2 |
| SE2 | Saturation factor at E2 |