Exciter Model: ESAC6A
Following checks and corrections are applied during Validation and AutoCorrection.
- If 0 < Te < Mult*TimeStep then Te = Mult*TimeStep
- If 0.0 < Tr < 0.5*Mult*TimeStep then Tr = 0, ElseIf 0.5*Mult*TimeStep < Tr < Mult*TimeStep then Tr = Mult*TimeStep
- If Vrmax < Vrmin then swap the values
- If Vamax < Vamin 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 limits or if Vr < Vrmin, then Vrmin = Vr
- If Va > Vamax, then Vamax = Va limits or if Va< Vamin, then Vamin = Va
Model Equations and/or Block Diagrams
Parameters:
| Tr | Filter time constant, sec |
| Ka | Voltage regulator gain |
| Ta | Voltage regulator time constant, sec |
| Tk | Voltage regulator time constant, sec |
| Tb | Time constant, sec |
| Tc | Time constant, sec |
| VaMax | Maximum control element output, pu |
| VaMin | Minimum control element output, pu |
| Vrmax | Maximum exciter control signal, pu |
| Vrmin | Minimum exciter control signal, pu |
| Te | Exciter field time constant, sec |
| Vfelim | Model Parameters\Vfelim |
| Kh | Exciter field current feedback gain, pu |
| Vhmax | Model Parameters\Vhmax |
| Th | VH time constant, sec |
| Tj | VH time constant, sec |
| Kc | Rectifier loading factor proportional to commutating reactance |
| Kd | Exciter internal reactance, pu |
| Ke | Exciter field resistance constant, pu |
| E1 | Field voltage value, 1 |
| SE1 | Saturation factor at E1 |
| E2 | Field voltage value, 2 |
| SE2 | Saturation factor at E2 |
| Spdmlt | If not zero, multiply output (Efd) by generator speed |