master:excst parametersPSCAD Type ST Exciter
Every parameter of the PSCAD Type ST Exciter (master:excst): 153 names, with the unit, the default and the meaning PSCAD gives each one. Copy a name into parameters().
What master:excst is
Type ST Exciter (Type ST exciter), a component of PSCAD's Master Library, filed under machines, exciters and governors.
- Definition
master:excst- PSCAD name
- Type ST Exciter
- Category
- Machines, exciters and governors
- Parameters
- 153, in 19 groups; 130 carry a unit
- Read from
- PSCAD 5.0.0, 2026-11-07
Read and write master:excst in Python
import mhi.pscad
pscad = mhi.pscad.connect() # the PSCAD that is open; launch() starts one
project = pscad.project("my_case") # a case loaded in the workspace
for comp in project.find_all("master:excst"): # the exact definition, namespace first
params = comp.parameters() # every parameter, as PSCAD holds it
print(str(params["EDMX_2"])) # Max Exciter Output Voltage [EFDMAX], in pu
comp = project.find_all("master:excst")[0]
comp.parameters(EDMX_2="7.1 [pu]") # a value that carries a unit is written with it- A parameter is named exactly as in the table, letter case included:
parameters()gives every one of them in a dictionary, and a name the component does not have is refused. - A value that carries a unit comes back as a number whose unit is only in its text, so read it as text first (
str(...)) or the unit is lost. PSCAD keeps a written unit as it is given:"2500 [mohm]"stays in mohm. - A Choice is read and written as its symbol (the capitals in "Written as"), not as the words PSCAD shows in the dialog.
find_all()takes the exact definition only. A wildcard or a bare name withoutmaster:comes back empty; the Builder'spx_findwalks the pages for those.
The Builder's runtime does the same with the unit handled for you: px_get(comp, "EDMX_2") and px_set(...), which also records the old value so the case is put back at the end. Getting started shows them.
- St2A Exciter and Compounding Parameters7
- St3A Inner Loop Field Regulator7
- St6B Compounding Parameters7
- St1A Field Circuit Constants10
- St5B Field Circuit Constants6
- St5B Forward Lead-Lag Parameters17
- St6B Inner Loop Field Regulator9
- Configuration8
- St1A Feedback and Regulator Parameters6
- St2A Feedback and Regulator Parameters7
- St3A Forward and Regulator Parameters10
- St3A Compounding Parameters5
- St4B Compounding Parameters8
- St4B Inner Loop Field Regulator5
- St7B Other Parameters6
- St6B Regulator Constants8
- St4B Regulator Constants7
- St7B Regulator Constants13
- St1A Forward Lead-Lag Parameters7
St2A Exciter and Compounding Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
EDMX_2Real | pu | 3.55 | Max Exciter Output Voltage [EFDMAX] |
KC_2Real | pu | 1.82 | Rectifier Loading Factor [KC]At least 0 |
KE_2Real | pu | 1.00 | Exciter Constant Related to Field [KE]At least 0 |
KI_2Real | pu | 8.00 | Compounding Circuit Current Multiplier [KI]At least 0 |
KP_2Real | pu | 4.88 | Compounding Circuit Voltage Multiplier [KP]At least 0 |
TE_2Real | s | 0.50 | Exciter Time Constant [TE]At least 0 |
VUEL_2Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_2!=0) |
St3A Inner Loop Field Regulator
| Parameter | Unit | Default | Description |
|---|---|---|---|
EDMX_3Real | pu | 8.63 | Maximum Exciter Output Voltage [EFDMAX] |
KG_3Real | pu | 1.00 | Field Inner Loop Feedback Gain [KG]At least 0 |
KM_3Real | pu | 7.04 | Field Inner Loop Gain Constant [KM]At least 0 |
TM_3Real | s | 0.40 | Field Inner Loop Time Constant [TM]At least 0 |
VGMX_3Real | pu | 6.53 | Field Inner Loop Fdb Maximum [VGMAX] |
VMMN_3Real | pu | 0.00 | Field Inner Loop Minimum Output [VMMIN] |
VMMX_3Real | pu | 1.00 | Field Inner Loop Maximum Output [VMMAX] |
St6B Compounding Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
EXVB_6Choice | · | NO | External Power for Rectifier? [VB]Written as NO, YES |
KC_6Real | pu | 0.113 | Rectifier Loading Factor [KC]At least 0Used when (EXVB_6==0) |
KI_6Real | pu | 0.0 | Compounding Circuit Current Multiplier [KI]At least 0Used when (EXVB_6==0) |
KPM_6Real | pu | 9.3 | Magnitude of Compounding Circuit Voltage Multiplier [|KP|]At least 0Used when (EXVB_6==0) |
KPT_6Real | deg | 0.0 | Angle of Compounding Circuit Voltage Multiplier [THETA]Used when (EXVB_6==0) |
VBMX_6Real | pu | 11.63 | Maximum Exciter Available Voltage [VBMAX]At least 0Used when (EXVB_6==0) |
XL_6Real | pu | 0.124 | Potential Source Reactance [XL]At least 0Used when (EXVB_6==0) |
St1A Field Circuit Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
IBSF_1Choice | · | BUS_FED | Exciter Voltage SupplyWritten as BUS_FED (Bus Fed), INDEPENDENT (Independent) |
ILR_1Real | pu | 4.4 | Exciter Output Current Limit Reference [ILR] |
KC_1Real | pu | 0.038 | Field Current Commutating Impedance [KC]At least 0 |
KLR_1Real | pu | 4.54 | Exciter Output Current Limit Gain [KLR]At least 0 |
VIMN_1Real | pu | -1.0E10 | Lower Limit on Error Signal [VIMIN] |
VIMX_1Real | pu | 1.0E10 | Upper Limit on Error Signal [VIMAX] |
VOEL_1Real | pu | 1.0E10 | Over Excitation Limiter Input [VOEL]Used when (OEL_1!=0) |
VRMN_1Real | pu | -6.0 | Minimum Field Voltage [VRMIN] |
VRMX_1Real | pu | 6.43 | Maximum Field Voltage [VRMAX] |
VUEL_1Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_1!=0) |
St5B Field Circuit Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
IBSF_5Choice | · | BUS_FED | Exciter Voltage SupplyWritten as BUS_FED (Bus Fed), INDEPENDENT (Independent) |
KC_5Real | pu | 0.004 | Field Current Commutating Impednace [KC]At least 0 |
VOEL_5Real | pu | 1.0E10 | Over Excitation Limiter Input [VOEL]Used when (OEL_5!=0) |
VRMN_5Real | pu | -4.0 | Minimum Field Voltage [VRMIN] |
VRMX_5Real | pu | 5.0 | Maximum Field Voltage [VRMAX] |
VUEL_5Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_5!=0) |
St5B Forward Lead-Lag Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
IEEE_StdChoice | · | 1992_ADDENDUM | Select the appropriate IEEE Std 421.5Written as 1992_ADDENDUM (1992 addendum), 2005 |
KR_5Real | pu | 200.0 | Regulator Gain [KR]At least 0 |
OEL_5Choice | · | NO | Over Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
T1_5Real | s | 0.004 | Regulator Time Constant [T1]At least 0 |
TB1_5Real | s | 6.0 | 1st Lag Time Constant [TB1]At least 0 |
TB2_5Real | s | 0.01 | 2nd Lag Time Constant [TB2]At least 0 |
TC1_5Real | s | 0.8 | 1st Lead Time Constant [TC1]At least 0 |
TC2_5Real | s | 0.08 | 2nd Lead Time Constant [TC2]At least 0 |
TOB1_5Real | s | 6.0 | Overexcitation: 1st Lag Time Constant [TOB1]At least 0Used when (IEEE_Std == 2005) |
TOB2_5Real | s | 0.01 | Overexcitation: 2nd Lag Time Constant [TOB2]At least 0Used when (IEEE_Std == 2005) |
TOC1_5Real | s | 0.8 | Overexcitation: 1st Lead Time Constant [TOC1]At least 0 |
TOC2_5Real | s | 0.08 | Overexcitation: 2nd Lead Time Constant [TOC2]At least 0Used when (IEEE_Std == 2005) |
TUB1_5Real | s | 6.0 | Underexcitation: 1st Lag Time Constant [TUB1]At least 0Used when (IEEE_Std == 2005) |
TUB2_5Real | s | 0.01 | Underexcitation: 2nd Lag Time Constant [TUB2]At least 0Used when (IEEE_Std == 2005) |
TUC1_5Real | s | 0.8 | Underexcitation: 1st Lead Time Constant [TUC1]At least 0Used when (IEEE_Std == 2005) |
TUC2_5Real | s | 0.08 | Underexcitation: 2nd Lead Time Constant [TUC2]At least 0Used when (IEEE_Std == 2005) |
UEL_5Choice | · | NO | Under Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
St6B Inner Loop Field Regulator
| Parameter | Unit | Default | Description |
|---|---|---|---|
ILR_6Real | pu | 4.164 | Current Limit Ref. [ILR] |
KCI_6Real | pu | 1.0577 | Current Limit Adjustment [KCI] |
KFF_6Real | pu | 1.0 | Pre-control Gain Constant [KFF] |
KG_6Real | pu | 1.0 | Field Inner Loop Feedback Gain [KG]At least 0 |
KLR_6Real | pu | 17.33 | Current Limit Gain [KLR] |
KM_6Real | pu | 1.0 | Forward Gain Constant [KM] |
TG_6Real | pu | 0.02 | Field Inner Loop Time Constant [TG]At least 0 |
VRMN_6Real | pu | -3.85 | Field Inner Loop Minimum Output [VRMIN] |
VRMX_6Real | pu | 4.81 | Field Inner Loop Maximum Output [VRMAX] |
Configuration
| Parameter | Unit | Default | Description |
|---|---|---|---|
INITInteger | · | 1 | Exciter Status: 0-Initialize,1-Normal |
NameText | · | · | Name for identificationEnter a name for identification |
OVRChoice | · | NO | Output internally computed initial Vref?Written as NO (No), YES (Yes) |
RCReal | pu | 0.0 | Load Compensating Resistance [Rc]At least 0 |
STABChoice | · | NO | Is there a Stabilizer ?Written as NO (No), YES (Yes) |
TRReal | s | 0.0 | Transducer Time Constant [Tr]At least 0 |
TYPEChoice | · | ST1A | Static Exciter TypeWritten as ST1A, ST2A, ST3A, ST4B, ST5B, ST6B, ST7B |
XCReal | pu | 0.0 | Load Compensating Reactance [Xc]At least 0 |
St1A Feedback and Regulator Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
KA_1Real | pu | 21.0 | Regulator Gain [KA]At least 0 |
KF_1Real | pu | 0.0 | Rate Feedback Gain [KF]At least 0 |
TA_1Real | s | 0.0 | Regulator Time Constant [TA]At least 0 |
TF_1Real | s | 0.0 | Rate Feedback Time Constant [TF]At least 0 |
VAMN_1Real | pu | -999. | Minimum Regulator Output [VAMIN] |
VAMX_1Real | pu | 999. | Maximum Regulator Output [VAMAX] |
St2A Feedback and Regulator Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
KA_2Real | pu | 120.0 | Regulator Gain [KA]At least 0 |
KF_2Real | pu | 0.05 | Rate Feedback Gain [KF]At least 0 |
TA_2Real | s | 0.15 | Regulator Time Constant [TA]At least 0 |
TF_2Real | s | 1.0 | Rate Feedback Time Constant [TF]At least 0 |
UEL_2Choice | · | NONE | Under Excitation Limit Input Signal?Written as NONE (None), SUMMATION (Summation), HV_GATE (HV Gate) |
VRMN_2Real | pu | 0.0 | Minimum Regulator Output [VRMIN] |
VRMX_2Real | pu | 1.0 | Maximum Regulator Output [VRMAX] |
St3A Forward and Regulator Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
KA_3Real | pu | 200.0 | Regulator Gain [KA]At least 0 |
TA_3Real | s | 0.0 | Regulator Time Constant [TA]At least 0 |
TB_3Real | s | 6.67 | Lag Time Constant [TB]At least 0 |
TC_3Real | s | 1.0 | Lead Time Constant [TC]At least 0 |
UEL_3Choice | · | NO | Under Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
VIMN_3Real | pu | -0.2 | Lower Limit on Error Signal [VIMIN] |
VIMX_3Real | pu | 0.2 | Upper Limit on Error Signal [VIMAX] |
VRMN_3Real | pu | -10.0 | Minimum Regulator Output [VRMIN] |
VRMX_3Real | pu | 10.0 | Maximum Regulator Output [VRMAX] |
VUEL_3Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_3!=0) |
St3A Compounding Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
KC_3Real | pu | 1.10 | Rectifier Loading Factor [KC]At least 0 |
KI_3Real | pu | 4.83 | Compounding Circuit Current Multiplier [KI]At least 0 |
KPA_3Real | deg | 20.0 | Angle of Compounding Circuit Voltage Multiplier [THETA_p] |
KPM_3Real | pu | 4.37 | Magnitude of Compounding Circuit Voltage Multiplier [|KP|]At least 0 |
XL_3Real | pu | 0.09 | Potential Source Reactance [XL]At least 0 |
St4B Compounding Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
KC_4Real | pu | 0.113 | Rectifier Loading Factor [KC]At least 0 |
KI_4Real | pu | 0.0 | Compounding Circuit Current Multiplier [KI]At least 0 |
KPA_4Real | deg | 0.0 | Angle of Compounding Circuit Voltage Multiplier [THITA_p] |
KPM_4Real | pu | 9.3 | Magnitude of Compounding Circuit Voltage Multiplier [|KP|]At least 0 |
VBMX_4Real | pu | 11.63 | Maximum Exciter Available Voltage [VBMAX]At least 0 |
VOEL_4Real | pu | 1.0E10 | Over Excitation Limiter Input [VOEL]Used when (OEL_4!=0) |
VUEL_4Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_4!=0) |
XL_4Real | pu | 0.124 | Potential Source Reactance [XL]At least 0 |
St4B Inner Loop Field Regulator
| Parameter | Unit | Default | Description |
|---|---|---|---|
KG_4Real | pu | 0.0 | Field Inner Loop Feedback Gain [KG]At least 0 |
KIM_4Real | pu | 0.0 | Inner Loop Integral Gain [KIM]At least 0 |
KM_4Real | pu | 1.0 | Inner Loop Proporational Gain [KPM]At least 0 |
VMMN_4Real | pu | -99. | Field Inner Loop Min output [VMMIN] |
VMMX_4Real | pu | 99. | Field Inner Loop Max output [VMMAX] |
St7B Other Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
KH_7Real | pu | 1 | High Band Gain [KH] |
KIA_7Real | pu | 1 | Feedback Gain [KIA] |
KL_7Real | pu | 1 | Low Band Gain [KL] |
TF_7Real | s | 1 | Exciter Lag Time Constant [TF] |
TG_7Real | s | 1 | Exciter Lead Time Constant [TG] |
TIA_7Real | s | 3 | Feedback Time Constant [TIA] |
St6B Regulator Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
KIA_6Real | pu | 45.094 | Regulator Integral Gain [KIA]At least 0 |
KPA_6Real | pu | 18.038 | Regulator Proportional Gain [KPA]At least 0 |
OEL_6Choice | · | NO | Over Excitation Limit Input Signal?Written as NO (No), AT_1ST_SUMMATION_JUNCTION (At 1st Summation Junction), AT_2ND_SUMMATION_JUNCTION (At 2nd Summation Junction) |
UEL_6Choice | · | NO | Under Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
VAMN_6Real | pu | -3.85 | Minimum Regulator Output [VAMIN] |
VAMX_6Real | pu | 4.81 | Maximum Regulator Output [VAMAX] |
VOEL_6Real | pu | 1.0E10 | Over Excitation Limiter Input [VOEL]Used when (OEL_6!=0) |
VUEL_6Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_6!=0) |
St4B Regulator Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
KIR_4Real | pu | 1.75 | Regulator Integral Gain [KIR]At least 0 |
KR_4Real | pu | 1.75 | Regulator Proporational Gain [KPR]At least 0 |
OEL_4Choice | · | NO | Over Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
TA_4Real | s | 0.02 | Regulator Time Constant [TA]At least 0 |
UEL_4Choice | · | NO | Under Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
VRMN_4Real | pu | -0.87 | Minimum Regulator Output [VRMIN] |
VRMX_4Real | pu | 1.0 | Maximum Regulator Output [VRMAX] |
St7B Regulator Constants
| Parameter | Unit | Default | Description |
|---|---|---|---|
KPA_7Real | pu | 40 | Regulator Proporational Gain [KPA]At least 0 |
OEL1_7Choice | · | NO | Over Excitation Limit Input Signal [VOEL1]?Written as NO (No), AT_FIRST_SUM_JUNCTION (At First Sum. Junction), ATFIRST_LV_GATE (AtFirst LV Gate) |
OEL2_7Choice | · | NO | Over Excitation Limit Input Signal [VOEL2]?Written as NO (No), AT_THIRD_LV_GATE (At Third LV Gate) |
TB_7Real | s | 1 | Lag Time Constant [TB] |
TC_7Real | s | 1 | Lead Time Constant [TC] |
UEL_7Choice | · | NO | Under Excitation Limit Input Signal?Written as NO (No), AT_1ST_SUMMATION_POINT (At 1st summation point), AT_1ST_HV_GATE (At 1st HV gate), AT_3RD_HV_GATE (At 3rd HV gate) |
VMAX_7Real | pu | 1.1 | Maximum Voltage Output [VMAX] |
VMIN_7Real | pu | 0.9 | Minimum Voltage Output [VMIN] |
VOEL1_7Real | pu | 1.0E10 | Over Excitation Limiter Input [VOEL1]Used when (OEL1_7!=0) |
VOEL2_7Real | pu | 1.0E10 | Over Excitation Limiter Input [VOEL2]Used when (OEL2_7!=0) |
VRMAX_7Real | pu | 5 | Maximum Regulator Output [VRMAX] |
VRMIN_7Real | pu | -4.5 | Minimum Regulator Output [VRMIN] |
VUEL_7Real | pu | -1.0E10 | Under Excitation Limiter Input [VUEL]Used when (UEL_7!=0) |
St1A Forward Lead-Lag Parameters
| Parameter | Unit | Default | Description |
|---|---|---|---|
OEL_1Choice | · | NO | Over Excitation Limit Input Signal?Written as NO (No), YES (Yes) |
STAB_1Choice | · | REGULATOR | Stabilizer Input Signal?Written as REGULATOR (On Regulator), EXCITER (On Exciter) |
TB1_1Real | s | 0.0 | 2nd Lag Time Constant [TB1]At least 0 |
TB_1Real | s | 1.0 | 1st Lag Time Constant [TB]At least 0 |
TC1_1Real | s | 0.0 | 2nd Lead Time Constant [TC1]At least 0 |
TC_1Real | s | 1.0 | 1st Lead Time Constant [TC]At least 0 |
UEL_1Choice | · | NONE | Under Excitation Limit Input Signal?Written as NONE (None), INPUT (Input), AFTER_LIM (After Lim), OUTPUT (Output) |
Related
- All 345 definitions in the component reference
- Control tuning: overshoot, rise time and damping
- PSCAD automation with Python: getting started
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