This component models a 3-phase AC voltage source, with specified source and/or zero-sequence impedance. A zero-sequence impedance branch may be added directly within the component. Also, this component allows you to regulate the bus voltage on a remote location on the network, or the internal phase angle can be regulated to control source output power.
This source may be controlled through either fixed, internal parameters or variable external signals.
F: Frequency [Hz]
Ph: Phase angle [°] or [rad]
You can connect a slider to these external inputs for a convenient runtime manual adjustment, or use a control system output for dynamic adjustment.
More: |
Source Name |
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Text |
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Just an identifier. A name should be entered here to avoid compilation warnings |
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Source Impedance Type |
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Choice |
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Select the source impedance type as described in Impedance Data Entry |
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Source Control |
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Choice |
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Select Fixed, External or Auto as described in Source Control Modes |
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Base MVA (3-Phase) |
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REAL |
Constant |
Used in per-unitizing internal output variables [MVA] |
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Base Voltage (L-L, RMS) |
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REAL |
Constant |
Used in per-unitizing internal output variables [kV]
NOTE: Base voltage is NOT the source voltage magnitude. The source voltage magnitude is entered in the Source Values for Fixed Control dialog, or through external connection |
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Base Frequency |
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REAL |
Constant |
Used in per-unitizing internal output variables [Hz] |
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Voltage Input Time Constant |
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REAL |
Variable |
Enter the time constant for the voltage input.
The input voltage magnitude is passed through a Real Pole control, using this value as the time constant. Use a minimum voltage input time constant of 3 times the fundamental frequency period (i.e. 0.05 s for 60Hz and 0.06 s for 50Hz) in most cases to reduce start-up transients [s]. |
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Zero Seq. Differs from Positive Seq. ? |
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Choice |
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Select Yes or No to include a zero-sequence impedance branch |
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Impedance Data Format |
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Choice |
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Select RRL Values to enter the individual values of resistors and inductors or Impedance to enter magnitude and phase angle of impedance. See Impedance Data Entry for more details. |
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External Phase Input Unit |
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Choice |
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Select Radians or Degrees |
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Graphics Display |
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Choice |
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Select 3-phase view or single-line view |
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Specified Parameters |
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Choice |
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Select Behind Source Impedance or At the Terminal. The 'At the Terminal' option should be selected if the steady-state load flow terminal data is known (i.e. V, P and Q). 'Behind Source Impedance' should be selected if only E, q are known. See Data Format for Internal Control for more details. |
NOTE: These parameters are used only if Impedance Data Format | RRL Values is selected.
Resistance (Series) |
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REAL |
Constant |
Positive sequence series resistance [W] |
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Resistance (Parallel) |
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REAL |
Constant |
Positive sequence parallel resistance [W] |
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Inductance (Parallel) |
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REAL |
Constant |
Positive sequence parallel inductance [H] |
NOTE: These parameters are used only if Impedance Data Format | Impedance is selected.
+ve Seq. Impedance |
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REAL |
Constant |
Positive sequence impedance magnitude [W] |
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+ve Seq. Imp. Phase Angle |
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REAL |
Constant |
Positive sequence impedance phase angle [°] |
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Harm. # where Phase is Same as Fund. |
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REAL |
Constant |
The harmonic number of the frequency, where the phase angle of the impedance at that frequency is the same as that at the fundamental. See Impedance Data Entry for more |
NOTE: These parameters are used only if Zero Seq. Differs from Positive Seq. ? and Impedance Data Format | RRL Values are selected.
Parallel or Series |
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Choice |
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Select Series or Parallel.
This defines the configuration of the impedance elements. |
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Resistance (Parallel) |
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REAL |
Constant |
Zero sequence parallel resistance [W] |
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Inductance (Parallel) |
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REAL |
Constant |
Zero sequence parallel inductance [H] |
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Resistance (Series) |
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REAL |
Constant |
Zero sequence series resistance [W] |
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Inductance (Series) |
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REAL |
Constant |
Zero sequence series inductance [H] |
NOTE: These parameters are used only if Zero Sequence Impedance Included? and Impedance Data Format | Impedance is selected.
Zero Sequence Impedance |
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REAL |
Constant |
Zero sequence impedance magnitude [W] |
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Zero Seq. Imp. Phase Angle |
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REAL |
Constant |
Zero sequence impedance phase angle [°] |
Source Values for Fixed Control
NOTE: These parameters are used only if Source Control | Fixed is selected.
Voltage Magnitude (L-L, RMS) |
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REAL |
Constant |
Source or terminal voltage magnitude [kV]. This input may represent either the source or the terminal voltage magnitude depending on the Specified Parameters parameter input. See Data Format for Internal Control for more details. |
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Frequency |
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REAL |
Constant |
Source frequency [Hz] |
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Phase |
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REAL |
Constant |
Source or terminal voltage phase shift [°]. This input may represent either the source or the terminal voltage phase angle depending on the Specified Parameters parameter input. See Data Format for Internal Control for more details. |
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Terminal Real Power |
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REAL |
Constant |
Enter the 3-phase real power P flowing at the terminal [pu]. This input is enabled only if Specified Parameters | At the Terminal is selected. See Data Format for Internal Control for more details. |
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Terminal Reactive Power |
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REAL |
Constant |
Enter the 3-phase reactive power Q flowing at the terminal [pu]. This input is enabled only if Specified Parameters | At the Terminal is selected. See Data Format for Internal Control for more details. |
NOTE: These parameters are used only if Source Control | Auto is selected.
Enable Automatic Voltage Control? |
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Choice |
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Select Yes or No |
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Desired Bus Voltage |
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REAL |
Variable |
Required bus voltage at the selected external bus point [pu] |
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Measurement Voltage Base (L-L, RMS) |
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REAL |
Constant |
Base voltage for selected external bus point [kV] |
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Measurement Time Const. |
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REAL |
Variable |
Smoothes measurement noise and simulates transducer delay [s] |
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Controller Time Const. |
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REAL |
Variable |
The controller uses a proportional integral controller to regulate the bus voltage at the desired level. The speed of this controller is determined by this time constant [s] |
NOTE: These parameters are used only if Source Control | Auto is selected.
Enable Automatic Power Control? |
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Choice |
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Select Yes or No |
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Desired Real Power Out |
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REAL |
Variable |
Regulates the power output of this source to this level on the system MVA base, specified in Base MVA (3-Phase) |
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Measurement Time Const. |
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REAL |
Variable |
Smoothes measurement noise and simulates transducer delay [s] |
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Controller Time Const. |
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REAL |
Variable |
The controller uses a proportional integral controller to regulate the bus voltage at the desired level. The speed of this controller is determined by this time constant [s] |
NOTE: Per-unit values are based on values entered in the Configuration dialog.
Name for PU Real Power (+Out) |
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REAL |
Output |
Name for the source real power output [pu] |
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Name for PU Reactive Power (+Out) |
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REAL |
Output |
Name for the source reactive power output [pu] |
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Name for PU RMS Source Volts |
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REAL |
Output |
Name for the source RMS voltage [pu] |
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Name for Source Angle (degrees) |
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REAL |
Output |
Name for the source phase angle [°] |
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Name for Phase Current (kA) |
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REAL |
Output |
Name for the specified source phase current [kA] |