NOTE: This component has been replaced by the newest revision: 421.5-2016 - IEEE Recommended Practice for Excitation System Models for Power System Stability Studies. See DC Exciters (2016).
This component models a standard IEEE type exciter. All input parameters are either entered in seconds (time constants) or per-unit (all other inputs). The various external inputs and outputs described below:
Inputs:
Ef0: This input defines the output field voltage to the machine during the initialization period. Ef0 can be either defined by the user or can be defined from within the attached synchronous machine (through a Wire). The model will initialize the internal variables so that this value will be the output at Ef.
[VT/IT]: This input is a 3-element array and receives its data from the attached synchronous machine (provided that the machine is set to output this data). VT is the RMS terminal voltage. IT is the synchronous machine terminal current and is complex (i.e. has a real and imaginary component). The real component of IT is in phase with VT and the imaginary component of IT is in quadrature (lagging is positive) with VT.
VS: This input is provided only when using the exciter with a power system stabilizer. Please note that no VS input is available for exciter DC3A.
Vref: This input defines the voltage reference for the synchronous machine terminals. The value can be derived from a number of different components, which might include a slider, a real constant component or some other signal.
Outputs:
Ef: This output is the computed field voltage applied directly to synchronous machine. A Wire may be used to make the connection.
Vref0: This output is the initialized value of the reference voltage Vref and can be applied at the users discretion.
More: |
Name for Identification |
Text |
Optional text parameter for identification of the component. |
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DC Exciter Type |
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Choice |
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Select DC1A, DC2A, DC3A or DC4A as described in DC Exciter Transfer Functions |
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Exciter Status => 0-Initialize;1-Normal |
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INTEGER |
Variable |
A variable name can be used. This variable can come from Output Variables for Controller Initialization section of the Synchronous Machine input parameters |
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Output Internally Computed Initial Vref? |
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Choice |
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Select Yes or No |
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Load Compensating Resistance (Rc) |
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REAL |
Constant |
Enter the load compensating resistance. See Load Compensation for more details [pu] |
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Load Compensating Reactance (Xc) |
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REAL |
Constant |
Enter the load compensating reactance. See Load Compensation for more details [pu] |
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Transducer Time Constant (Tr) |
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REAL |
Constant |
Enter the transducer time constant. See Load Compensation for more details [s] |
DC1A: Regulator ConstantsDC1A: Regulator Constants
NOTE: See DC Exciter Transfer Functions for more details.
Is There a Stabilizer? |
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Choice |
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Select Yes or No |
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Under Exc. Limit Input Signal? |
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Choice |
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Select None, Input or HV Gate |
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Lead Time Constant (TC) |
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REAL |
Constant |
Enter a value for the lead time constant [s] |
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Lag Time Constant (TB) |
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REAL |
Constant |
Enter a value for the lag time constant [s] |
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Regulator Gain (KA) |
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REAL |
Constant |
Enter a value for the regulator gain [pu] |
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Regulator Time Constant (TA) |
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REAL |
Constant |
Enter a value for the regulator time constant [s] |
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Maximum Regulator Output (VRMAX) |
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REAL |
Constant |
Enter a value for the maximum regulator output [pu] |
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Minimum Regulator Output (VRMIN) |
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REAL |
Constant |
Enter a value for the minimum regulator output [pu] |
DC1A: Exciter ParametersDC1A: Exciter Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Exciter Time Constant (TE) |
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REAL |
Constant |
Enter a value for the exciter time constant [s] |
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Excitation Type? |
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Choice |
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Select Self or Separately |
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Saturation at Efd1 (SE(Efd1)) |
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REAL |
Constant |
Enter a value for the saturation at Efd1 [pu] |
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Exciter Voltage for SE1 (Efd1) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE1 [pu] |
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Saturation at Efd2 (SE(Efd2)) |
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REAL |
Constant |
Enter a value for the saturation at Efd2 [pu] |
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Exciter Voltage for SE2 (Efd2) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE2 [pu] |
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Under Excitation Limiter Input (VUEL) |
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REAL |
Variable |
Enter a value for the under excitation limiter input [pu] |
DC1A: Rate Feedback ParametersDC1A: Rate Feedback Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Rate Feedback Gain (KF) |
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REAL |
Constant |
Enter a value for the rate feedback gain [pu] |
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Rate Feedback Time Constant (TF) |
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REAL |
Constant |
Enter a value for the rate feedback time constant [s] |
DC2A: Regulator ConstantsDC2A: Regulator Constants
NOTE: See DC Exciter Transfer Functions for more details.
Is There a Stabilizer? |
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Choice |
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Select Yes or No |
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Under Exc. Limit Input Signal? |
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Choice |
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Select None, Input or HV Gate |
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Lead Time Constant (TC) |
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REAL |
Constant |
Enter a value for the lead time constant [s] |
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Lag Time Constant (TB) |
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REAL |
Constant |
Enter a value for the lag time constant [s] |
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Regulator Gain (KA) |
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REAL |
Constant |
Enter a value for the regulator gain [pu] |
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Regulator Time Constant (TA) |
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REAL |
Constant |
Enter a value for the regulator time constant [s] |
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Maximum Regulator Output (VRMAX) |
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REAL |
Constant |
Enter a value for the maximum regulator output [pu] |
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Minimum Regulator Output (VRMIN) |
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REAL |
Constant |
Enter a value for the minimum regulator output [pu] |
DC2A: Exciter ParametersDC2A: Exciter Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Exciter Time Constant (TE) |
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REAL |
Constant |
Enter a value for the exciter time constant [s] |
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Excitation Type? |
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Choice |
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Select Self or Separately |
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Saturation at Efd1 (SE(Efd1)) |
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REAL |
Constant |
Enter a value for the saturation at Efd1 [pu] |
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Exciter Voltage for SE1 (Efd1) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE1 [pu] |
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Saturation at Efd2 (SE(Efd2)) |
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REAL |
Constant |
Enter a value for the saturation at Efd2 [pu] |
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Exciter Voltage for SE2 (Efd2) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE2 [pu] |
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Under Excitation Limiter Input (VUEL) |
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REAL |
Variable |
Enter a value for the under excitation limiter input [pu] |
DC2A: Rate Feedback ParametersDC2A: Rate Feedback Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Rate Feedback Gain (KF) |
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REAL |
Constant |
Enter a value for the rate feedback gain [pu] |
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Rate Feedback Time Constant (TF) |
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REAL |
Constant |
Enter a value for the rate feedback time constant [s] |
DC3A: Regulator ParametersDC3A: Regulator Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Rheostat Travel Time (TRH) |
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REAL |
Constant |
Enter a value for the rheostat travel time constant [s] |
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Maximum Regulator Output (VRMAX) |
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REAL |
Constant |
Enter a value for the maximum regulator output [pu] |
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Minimum Regulator Output (VRMIN) |
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REAL |
Constant |
Enter a value for the minimum regulator output [pu] |
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Fast Raise/Lower setting (Kv) |
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REAL |
Constant |
Enter a value for the fast raise/lower setting [pu] |
DC3A: Exciter ParametersDC3A: Exciter Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Exciter Time Constant (TE) |
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REAL |
Constant |
Enter a value for the exciter time constant [s] |
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Excitation Type? |
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Choice |
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Select Self or Separately |
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Saturation at Efd1 (SE(Efd1)) |
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REAL |
Constant |
Enter a value for the saturation at Efd1 [pu] |
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Exciter Voltage for SE1 (Efd1) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE1 [pu] |
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Saturation at Efd2 (SE(Efd2)) |
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REAL |
Constant |
Enter a value for the saturation at Efd2 [pu] |
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Exciter Voltage for SE2 (Efd2) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE2 [pu] |
DC4B: Regulator ConstantsDC4B: Regulator Constants
NOTE: See DC Exciter Transfer Functions for more details.
Is There a Stabilizer? |
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Choice |
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Select Yes or No |
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Under Exc. Limit Input Signal? |
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Choice |
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Select None, Input or HV Gate |
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Over Exc. Limit Input Signal? |
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Choice |
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Select None, Input or LV Gate |
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Regulator Proportional Gain (KP) |
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REAL |
Constant |
Enter a value for the regulator proportional gain [s] |
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Regulator Integral Gain (KI) |
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REAL |
Constant |
Enter a value for the regulator integral gain [s] |
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Regulator Derivative Gain (KD) |
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REAL |
Constant |
Enter a value for the regulator derivative gain [s] |
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Regulator Derivative Filter Time Constant (TD) |
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REAL |
Constant |
Enter a value for the regulator derivative filter time constant [ [s] |
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Regulator Gain (KA) |
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REAL |
Constant |
Enter a value for the regulator gain [pu] |
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Regulator Time Constant (TA) |
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REAL |
Constant |
Enter a value for the regulator time constant [s] |
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Maximum Regulator Output (VRMAX) |
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REAL |
Constant |
Enter a value for the maximum regulator output [pu] |
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Minimum Regulator Output (VRMIN) |
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REAL |
Constant |
Enter a value for the minimum regulator output [pu] |
DC4B: Exciter ParametersDC4B: Exciter Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Exciter Time Constant (TE) |
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REAL |
Constant |
Enter a value for the exciter time constant [s] |
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Excitation Type? |
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Choice |
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Select Self or Separately |
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Saturation at Efd1 (SE(Efd1)) |
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REAL |
Constant |
Enter a value for the saturation at Efd1 [pu] |
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Exciter Voltage for SE1 (Efd1) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE1 [pu] |
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Saturation at Efd2 (SE(Efd2)) |
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REAL |
Constant |
Enter a value for the saturation at Efd2 [pu] |
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Exciter Voltage for SE2 (Efd2) |
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REAL |
Constant |
Enter a value for the exciter voltage at SE2 [pu] |
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Under Excitation Limiter Input (VUEL) |
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REAL |
Variable |
Enter a value for the under excitation limiter input [pu] |
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Over Excitation Limiter Input (VOEL) |
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REAL |
Variable |
Enter a value for the over excitation limiter input [pu] |
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Exciter Minimum Output Voltage (VEMIN) |
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REAL |
Variable |
Enter a value for the exciter minimum output voltage [pu] |
DC4B: Rate Feedback ParametersDC4B: Rate Feedback Parameters
NOTE: See DC Exciter Transfer Functions for more details.
Rate Feedback Gain (KF) |
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REAL |
Constant |
Enter a value for the rate feedback gain [pu] |
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Rate Feedback Time Constant (TF) |
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REAL |
Constant |
Enter a value for the rate feedback time constant [s] |