Load Flow Source

Three-phase voltage source for flow distribution analysis.

blockType: AcausalElectricPowerSystems.Sources.LoadFlow

Path in the library:

/Physical Modeling/Electrical/Sources/Load Flow Source

Description

Block Load Flow Source — this is a three-phase voltage source used for flow distribution analysis.

The block can be used to implement a balancing node, PV node, or PQ node. The node type is selected in the drop-down menu of the parameter Source type.

When setting the value None for the parameter Source impedance block Load Flow Source simulates an ideal three-phase voltage source that maintains a sinusoidal voltage of a given magnitude at its terminals regardless of the current flowing through the source.

The source has a star configuration, and the n port provides a connection to the center of the star. Port ~ is a three—phase port representing the phases , and . The current is considered positive if it flows from the positive terminals to the center of the star, and the voltage at each phase is equal to the difference between the voltage at the positive terminals and the center of the star., .

Limitations

If initialization is performed with the Start simulation from steady state option disabled in the block Solver Configuration, for the parameter Source type the value must be set to Voltage source with series impedance.
During block initialization, when for the parameter Source type the value is set Swing bus, PV bus or PQ bus taking into account the internal impedance can lead to convergence problems during initialization.

Ports

Conserving

# ~ — three-phase voltage
electricity

Details

Three-phase port connected to voltage phases , and .

Program usage name

port

# n — The center of the star
electricity

Details

An electric non-directional port connected to the center of the star.

Program usage name

n

Parameters

Main

# Source type — voltage source model
Voltage source with series impedance | Swing bus | PV bus | PQ bus

Details

The type of voltage source modeled by the unit.

Values	`Voltage source with series impedance` \| `Swing bus` \| `PV bus` \| `PQ bus`
Default value	`Swing bus`
Program usage name	`source_type`
Evaluatable	No

# Terminal voltage (pu) — terminal voltage

Details

Terminal voltage generated by the source, O.E.

Dependencies

To use this parameter, set for the parameter Source type meaning Swing bus or PV bus.

Default value	`1.0`
Program usage name	`V_pu`
Evaluatable	Yes

# Rated voltage (phase-to-phase RMS) — nominal linear operating voltage value
V | uV | mV | kV | MV

Details

The nominal linear effective voltage value.

Units	`V` \| `uV` \| `mV` \| `kV` \| `MV`
Default value	`122.4744871391589 V`
Program usage name	`V_rated`
Evaluatable	Yes

# Rated frequency — Rated frequency
Hz | kHz | MHz | GHz

Details

Rated frequency, Hz.

Units	`Hz` \| `kHz` \| `MHz` \| `GHz`
Default value	`50.0 Hz`
Program usage name	`f`
Evaluatable	Yes

# Source voltage (pu) — source voltage

Details

Voltage generated by the source, O.E.

Dependencies

To use the parameter, set for the parameter Source type meaning Voltage source with series impedance.

Default value	`1.0`
Program usage name	`V_source_pu`
Evaluatable	Yes

# Source phase — source phase
rad | deg | rev | mrad | arcsec | arcmin | gon

Details

The phase shift of the source.

Dependencies

To use the parameter, set for the parameter Source type meaning Voltage source with series impedance.

Units	`rad` \| `deg` \| `rev` \| `mrad` \| `arcsec` \| `arcmin` \| `gon`
Default value	`0.0 deg`
Program usage name	`shift`
Evaluatable	Yes

# Active power generated — generated active power
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

The active power generated by the source.

Dependencies

To use the parameter, set for the parameter Source type meaning PV bus.

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`0.0 W`
Program usage name	`P_generated`
Evaluatable	Yes

# Active power consumed — active power consumption
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

The active power consumed by the source.

Dependencies

To use the parameter, set for the parameter Source type meaning PQ bus.

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`0.0 W`
Program usage name	`P_consumed`
Evaluatable	Yes

# Reactive power consumed — reactive power consumption
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

The reactive power consumed by the source.

Dependencies

To use the parameter, set for the parameter Source type meaning PQ bus.

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`0.0 V*A`
Program usage name	`Q_consumed`
Evaluatable	Yes

Impedance

# Source impedance — the method of setting the source impedance
None | X/R ratio | Series R | Series L | Series RL

Details

The type of source impedance. Selecting any other option activates the other options. The following options are available:

None;
X/R ratio;
Series R;
Series L;
Series RL.

Values	`None` \| `X/R ratio` \| `Series R` \| `Series L` \| `Series RL`
Default value	`None`
Program usage name	`impedance_option`
Evaluatable	No

# Short-circuit power level — short circuit power
W | uW | mW | kW | MW | GW | V*A | HP_DIN

Details

Short circuit power.

Dependencies

To use the parameter, set for the parameter Source impedance meaning X/R ratio.

Units	`W` \| `uW` \| `mW` \| `kW` \| `MW` \| `GW` \| `V*A` \| `HP_DIN`
Default value	`1.0e6 V*A`
Program usage name	`S_short_circuit`
Evaluatable	Yes

# Source X/R ratio — the ratio of reactance to active resistance

Details

The ratio of reactance to active resistance.

Dependencies

To use the parameter, set for the parameter Source impedance meaning X/R ratio.

Default value	`15.0`
Program usage name	`ratio_X_to_R`
Evaluatable	Yes

# Source impedance parasitic parallel conductance — parasitic parallel conduction of the source impedance
S | nS | uS | mS | 1/Ohm

Details

Parasitic parallel conduction of the source impedance.

Dependencies

To use the parameter, set for the parameter Source impedance meaning X/R ratio, or Series L, or Series RL.

Units	`S` \| `nS` \| `uS` \| `mS` \| `1/Ohm`
Default value	`0.0 1/Ohm`
Program usage name	`G_parasitic`
Evaluatable	Yes

# Source resistance — active resistance of the source
Ohm | mOhm | kOhm | MOhm | GOhm

Details

The resistance of the source.

Dependencies

To use the parameter, set for the parameter Source impedance meaning Series R or Series RL.

Units	`Ohm` \| `mOhm` \| `kOhm` \| `MOhm` \| `GOhm`
Default value	`0.01 Ohm`
Program usage name	`R`
Evaluatable	Yes

# Source inductance — source inductance
H | nH | uH | mH

Details

The inductance of the source.

Dependencies

To use the parameter, set for the parameter Source impedance meaning Series L or Series RL.

Units	`H` \| `nH` \| `uH` \| `mH`
Default value	`0.000397 H`
Program usage name	`L`
Evaluatable	Yes

Expected Ranges

# Minimum voltage (pu) — minimum voltage

Details

Minimum voltage, i.e. This parameter helps in finding initial values in circuits with non-physical, very low voltages.

Dependencies

To use the parameter, set for the parameter Source type in the parameter group Main meaning Swing bus, PV bus or PQ bus.

Default value	`0.95`
Program usage name	`V_min_pu`
Evaluatable	Yes