Stabilizer Model: PSS6C

 

Following checks and corrections are applied during Validation and AutoCorrection.

  • If Ks <= 0 then Ks = Mult*TimeStep

  • If K0 <= 0 then K0 = Mult*TimeStep
  • If Vstmax < Vstmin then swap the values. If Vstmax < 0 then Vstmax change sign to positive. If Vstmin > 0 then change sign to negative.
  • If Vsi1max < Vsi1min then swap the values. If Vsi1max < 0 then Vsi1max change sign to positive. If Vsi1min > 0 then change sign to negative.
  • If Vsi2max < Vsi2min then swap the values. If Vsi2max < 0 then Vsi2max change sign to positive. If Vsi2min > 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 Vpss > Vstmax, then Vstmax = Vpss limits or if Vpss < Vstmin , then Vstmin = Vpss

Model Equations and/or Block Diagrams

Parameters:

Ics1 First stabilizer input code; 1=Rotor speed deviation (pu); 2=Bus Freq Deviation (pu); 3=Gen Pelec on Machine Base (pu); 4=Gen accelerating power (pu); 5=Bus voltage (pu); 6=Derivative of Bus voltage (pu); 7=Compensated Frequency Signal (pu)
Ics2 Second stabilizer input code; 1=Rotor speed deviation (pu); 2=Bus Freq Deviation (pu); 3=Gen Pelec on Machine Base (pu); 4=Gen accelerating power (pu); 5=Bus voltage (pu); 6=Derivative of Bus voltage (pu)
Ks1 PSS gain for input channel 1
T1 PSS transducer time constant for input channel 1
T3 PSS time constant for input channel 1
Ks2 PSS gain for input channel 2
Macc PSS washout time constant for input channel 2
T2 PSS transducer time constant for input channel 2
T4 PSS time constant for input channel 2
Td PSS washout time constant
K0 PSS canoniocal gain 0
K1 PSS canoniocal gain 1
K2 PSS canoniocal gain 2
K3 PSS canoniocal gain 3
K4 PSS canoniocal gain 4
Ki3 PSS third block gain
Ki4 PSS fourth block gain
Ks PSS main gain
Ti1 PSS time constant in first block
Ti2 PSS time constant in second block
Ti3 PSS time constant in third block
Ti4 PSS time constant in fourth block
Vsi1max Input Signal 1 maximum limit
Vsi1min Input Signal 1 minimum limit
Vsi2max Input Signal 2 maximum limit
Vsi2min Input Signal 2 minimum limit
VSTmax Maximum PSS output
VSTmin Minimum PSS output
PSSActivation Generator MW threshold for PSS activation
PSSDeactivation Generator MW threshold for PSS da-activation
Tpgfilt Filter time constant for Pgen used in PSS output logic
Xcomp Reactance for compensated frequency calculation
Tcomp Time constant for compensated frequency calculation