Stator Current Limiter: SCL1C
AutoCorrection Properties
Following checks and corrections are applied during Validation and AutoCorrection.
- If 0.0 < TIT < 0.5*Mult*TimeStep then TIT = 0, ElseIf 0.5*Mult*TimeStep < TIT < Mult*TimeStep then TIT = Mult*TimeStep
- If 0.0 < TQSCL < 0.5*Mult*TimeStep then TQSCL = 0, ElseIf 0.5*Mult*TimeStep < TQSCL < Mult*TimeStep then TQSCL = Mult*TimeStep
- If 0.0 < TINV < 0.5*Mult*TimeStep then TINV = 0, ElseIf 0.5*Mult*TimeStep < TINV < Mult*TimeStep then TINV = Mult*TimeStep
- KPoex and KIoex: KPoex can't be 0 if KIoex = 0, if true then KPoex changed to 1.
- KPuex and KIuex: KPoex can't be 0 if KIuex = 0, if true then KPuex changed to 1.
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If VSCLmax < VSCLmin then swap the values. If VSCLmax< 0 then VSCLmax change sign to positive. If VSCLmin > 0 then change sign to negative.
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 VSCL > VSCLmax, then VSCLmax = VSCL limits or if VSCL < VSCLmin, then VSCLmin = VSCL
Model Equations and/or Block Diagrams
Parameters:
| TB1oel | Overexcited regulator denominator lag time constant 1 (s) |
| TC1oel | Overexcited regulator numerator lead time constant 1 (s) |
| TB2oel | Overexcited regulator denominator lag time constant 2 (s) |
| TC2oel | Overexcited regulator numerator lead time constant 2 (s) |
| KPoel | Overexcited PID regulator proportional gain (pu) |
| KIoel | Overexcited PID regulator integral gain (pu) |
| KDoel | Overexcited PID regulator differential gain (pu) |
| TDoel | Overexcited PID regulator differential time constant (s) |
| VOELmax3 | Maximum OEL PID output limit (pu) |
| VOELmin3 | Minimum OEL PID output limit (pu) |
| VOELmax2 | Maximum OEL lead lag 1 output limit (pu) |
| VOELmin2 | Minimum OEL lead lag 1 output limit (pu) |
| VOELmax1 | Maximum OEL output limit (pu) |
| VOELmin1 | Minimum OEL output limit (pu) |
| TB1uel | Underexcited regulator denominator lag time constant 1 (s) |
| TC1uel | Underexcited regulator numerator lead time constant 1 (s) |
| TB2uel | Underexcited regulator denominator lag time constant 2 (s) |
| TC2uel | Underexcited regulator numerator lead time constant 2 (s) |
| KPuel | Underexcited PID regulator proportional gain (pu) |
| KIuel | Underexcited PID regulator integral gain (pu) |
| KDuel | Underexcited PID regulator differential gain (pu) |
| TDuel | Underexcited PID regulator differential time constant (s) |
| VUELmax3 | Maximum UEL PID output limit (pu) |
| VUELmin3 | Minimum UEL PID output limit (pu) |
| VUELmax2 | Maximum UEL lead lag 1 output limit (pu) |
| VUELmin2 | Minimum UEL lead lag 1 output limit (pu) |
| VUELmax1 | Maximum UEL output limit (pu |
| VUELmin1 | Minimum UEL output limit (pu) |
| Ireset | SCL reset reference, if inactive (pu) |
| TenOEL | Overexcited activation delay time (s) |
| TenUEL | Underexcited activation delay time (s) |
| Toff | SCL reset delay time (s) |
| ITHoff | SCL reset threshold value (pu) |
| TIQoel | Overexcited reactive current time constant (s) |
| KIQoel | Overexcited reactive current scaling factor (pu/pu) |
| TIPoel | Overexcited active current time constant (s) |
| KIPoel | Overexcited active current scaling factor (pu/pu) |
| TIQuel | Underexcited reactive current time constant (s) |
| KIQuel | Underexcited reactive current scaling factor (pu/pu) |
| TIPuel | Underexcited active current time constant (s) |
| KIPuel | Underexcited active current scaling factor (pu/pu) |
| TITscl | Stator current transducer time constant (s) |
| ITFpu | SCL thermal reference for inverse time calculations (pu) |
| Iinst | SCL instantaneous stator current limit (pu) |
| IinstUEL | Underexcited region instantaneous stator current limit (pu) |
| Ilim | SCL thermal stator current limit (pu) |
| TAoel | SCL reference filter time constant (s) |
| c1 | SCL exponent for calculation of IERRinv1 (pu) |
| K1 | SCL gain for calculation of IERRinv1 (pu/pu) |
| c2 | SCL exponent for calculation of IERRinv2 (pu) |
| K2 | SCL gain for calculation of IERRinv2 (pu/pu) |
| VINVmax | SCL maximum inverse time output (pu) |
| VINVmin | SCL minimum inverse time output (pu) |
| Fixedru | SCL fixed delay time output (pu) |
| Fixedrd | SCL fixed cooling down time output (pu) |
| TSCL | SCL timer reference (pu) |
| Tmax | SCL timer maximum level (pu) |
| Tmin | SCL timer minimum level (pu) |
| KFB | SCL timer feedback gain (pu) |
| SW1 | OEL reference ramp logic selection (0 = fixed ramp rates - Kru and Krd, 1 = IERRinv1) |
| Krd | SCL reference ramp down rate (pu/s) |
| Kru | SCL reference ramp up rate (pu/s) |
| KZRU | SCL thermal reference release threshold (pu) |
| TVTscl | Terminal voltage transducer time constant (s) |
| VTmin | SCLoel minimum voltage reference value (pu) |
| VTreset | SCLoel voltage reset value (pu) |
| IQminOEL | SCLoel minimum reactive current reference value (pu) |
| IQmaxUEL | SCLoel maximum reactive current reference value (pu) |
| KPref | SCL reference scaling factor based on active current (pu) |