DC Line Model: CDC1T, CDC4T, CDC6, and CDC6T

 

Following checks and corrections are applied during Validation and AutoCorrection on the Tmeasr, Tmeasi, and Tvrdc parameters

  • If 0.0 < T < 0.5*Mult*TimeStep then T = 0, ElseIf 0.5*Mult*TimeStep < T < Mult*TimeStep then T = Mult*TimeStep

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

 

Model Equations and/or Block Diagrams

For a Detailed Treatment of how DC lines are implemented in the software see the help topic here.

Parameters for CDC1T:

T1 dc voltage transducer time constant (sec)
T2 dc line current time constant (sec)
IMIN minimum current demand (amps)
I1 limit point 1, current (amps)
V2 limit point 2, voltage (V)
I2 limit point 2, current (amps)
V3 limit point 3, voltage (V)
I3 limit point 3, current (amps)
DELTI current margin (pu)
VMIN shutdown voltage (pu)
VON unblocking voltage (pu)
TMIN minimum blocking time (sec)
RAMP recovery rate (pu/sec)

 

Parameters for CDC4T:

AlphaMin Minimum rectifier firing angle, degrees
GammaMin Minimum inverter firing angle, degrees
Tmeasv D.C. voltage transducer time constant,sec.
tmeasi D.C. current transducer time constant,sec.
Vblock Rectifier a.c. blocking voltage, p.u.
Vunbl Rectifier a.c. unblocking voltage, p.u.
Tblock Minimum blocking time, sec.
Vbypas Inverter d.c. voltage for bypassing, p.u.
Vunby Inverter a.c. unbypassing voltage, p.u.
Tbypas Minimum bypassing time, sec.
Rsvolt Minimum d.c. voltage following block, kV
Rscur Minimum d.c. current following block, amps
Vramp Restart voltage ramping rate, pu/sec. (set to <= 0 to ignore ramp and return to setpoint immediately)
Cramp Restart current ramping rate, pu/sec. (set to <= 0 to ignore ramp and return to setpoint immediately)
C0 Minimum d.c. current, amps
V1 VDCOL curve points, kV, amps
C1 VDCOL curve points, d.c. voltage, kv
V2 VDCOL curve points, kV, amps
C2 VDCOL curve points, d.c. voltage, kv
V3 VDCOL curve points, kV, amps
C3 VDCOL curve points, d.c. voltage, kv
Tcmode Minimum time in forced current mode, sec.

 

Parameters for CDC6:

AlphaMin Minimum rectifier firing angle, degrees
GammaMin Minimum inverter firing angle, degrees
Tmeasv D.C. voltage transducer time constant,sec.
tmeasi D.C. current transducer time constant,sec.
Vblock Rectifier a.c. blocking voltage, p.u.
Vunbl Rectifier a.c. unblocking voltage, p.u.
Tblock Minimum blocking time, sec.
Vbypas Inverter d.c. voltage for bypassing, p.u.
Vunby Inverter a.c. unbypassing voltage, p.u.
Tbypas Minimum bypassing time, sec.
Rsvolt Minimum d.c. voltage following block, kV
Rscur Minimum d.c. current following block, amps
Vramp Restart voltage ramping rate, pu/sec. (set to <= 0 to ignore ramp and return to setpoint immediately)
Cramp Restart current ramping rate, pu/sec. (set to <= 0 to ignore ramp and return to setpoint immediately)
C0 Minimum d.c. current, amps
V1 VDCOL curve points, kV, amps
C1 VDCOL curve points, d.c. voltage, kv
V2 VDCOL curve points, kV, amps
C2 VDCOL curve points, d.c. voltage, kv
V3 VDCOL curve points, kV, amps
C3 VDCOL curve points, d.c. voltage, kv
Tcmode Minimum time in forced current mode, sec.
Vdeblk Rectifier time delayed blocking voltage, p.u.
Tdeblk Rectifier blocking delay time, sec.
Treblk Rectifier unblocking delay time, sec.
Vinblk Inverter time delayed blocking voltage, p.u.
Tcomb Communication delay for inverter blocl, sec.
Vacbyp Inverter a.c. voltage for bypass, p.u.
Tdebyp Inverter time delayed bypass time, sec.
Tinblk Inverter unblocking delay time, sec.
Tinbyp Inverter unbypassing delay time, sec.
Tvrdc Rectifier d.c. voltage transducer time constant, sec.
Imarg Dynamic Current Margin, amps

 

Parameters for CDC6T:

AlphaMin Minimum rectifier firing angle, degrees
GammaMin Minimum inverter firing angle, degrees
Tmeasv D.C. voltage transducer time constant,sec.
tmeasi D.C. current transducer time constant,sec.
Vblock Rectifier a.c. blocking voltage, p.u.
Vunbl Rectifier a.c. unblocking voltage, p.u.
Tblock Minimum blocking time, sec.
Vbypas Inverter d.c. voltage for bypassing, p.u.
Vunby Inverter a.c. unbypassing voltage, p.u.
Tbypas Minimum bypassing time, sec.
Rsvolt Minimum d.c. voltage following block, kV
Rscur Minimum d.c. current following block, amps
Vramp Restart voltage ramping rate, pu/sec. (set to <= 0 to ignore ramp and return to setpoint immediately)
Cramp Restart current ramping rate, pu/sec. (set to <= 0 to ignore ramp and return to setpoint immediately)
C0 Minimum d.c. current, amps
V1 VDCOL curve points, kV, amps
C1 VDCOL curve points, d.c. voltage, kv
V2 VDCOL curve points, kV, amps
C2 VDCOL curve points, d.c. voltage, kv
V3 VDCOL curve points, kV, amps
C3 VDCOL curve points, d.c. voltage, kv
Tcmode Minimum time in forced current mode, sec.
Vdeblk Rectifier time delayed blocking voltage, p.u.
Tdeblk Rectifier blocking delay time, sec.
Treblk Rectifier unblocking delay time, sec.
Vinblk Inverter time delayed blocking voltage, p.u.
Tcomb Communication delay for inverter blocl, sec.
Vacbyp Inverter a.c. voltage for bypass, p.u.
Tdebyp Inverter time delayed bypass time, sec.
Tinblk Inverter unblocking delay time, sec.
Tinbyp Inverter unbypassing delay time, sec.
Tvrdc Rectifier d.c. voltage transducer time constant, sec.