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Three-Phase Series RLC Load

Implement three-phase series RLC load with selectable connection

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  • Three-Phase Series RLC Load block

Libraries:
Simscape / Electrical / Specialized Power Systems / Passives

Description

The Three-Phase Series RLC Load block implements a three-phase balanced load as a series combination of RLC elements. At the specified frequency, the load exhibits a constant impedance. The active and reactive powers absorbed by the load are proportional to the square of the applied voltage.

Only elements associated with nonzero powers are displayed in the block icon.

Ports

Conserving

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Specialized electrical conserving port associated with phase A.

Specialized electrical conserving port associated with phase B.

Specialized electrical conserving port associated with phase C.

Specialized electrical conserving port associated with the neutral.

Dependencies

To enable this port, set Configuration to Y (neutral).

Parameters

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To edit block parameters interactively, use the Property Inspector. From the Simulink® Toolstrip, on the Simulation tab, in the Prepare gallery, select Property Inspector.

Parameters

The connection of the three phases. Select one of the following four connections:

Y(grounded)

Neutral is grounded.

Y(floating)

Neutral is not accessible.

Y(neutral)

Neutral is made accessible through a fourth connector.

Delta

Three phases connected in delta

The block icon is updated according to the load connection.

Nominal phase-to-phase voltage of the load, in volts RMS (Vrms).

Dependencies

To enable this parameter, clear the Specify PQ powers for each phase parameter.

Nominal phase-to-neutral voltages of the load, in volts RMS (Vrms).

Dependencies

To enable this parameter, select the Specify PQ powers for each phase parameter.

The nominal frequency, in hertz (Hz). Default is 60.

Option to specify active powers, inductive reactive powers, and capacitive reactive powers for each phase of the load.

Three-phase active power of the load, in watts.

Dependencies

To enable this parameter, clear the Specify PQ powers for each phase parameter.

Three-phase inductive reactive power QL, in vars.

Dependencies

To enable this parameter, clear the Specify PQ powers for each phase parameter.

Three-phase capacitive reactive power QC, in vars.

Dependencies

To enable this parameter, clear the Specify PQ powers for each phase parameter.

Three-phase active power of the load, in watts. You can specify different powers for each phase, including 0.

Dependencies

To enable this parameter, select the Specify PQ powers for each phase parameter.

Three-phase inductive reactive power QL, in vars. You can specify different powers for each phase, including 0.

Dependencies

To enable this parameter, select the Specify PQ powers for each phase parameter.

Three-phase capacitive reactive power QC, in vars. You can specify different powers for each phase, including 0.

Dependencies

To enable this parameter, select the Specify PQ powers for each phase parameter.

Select Branch voltages to measure the three voltages across each phase of the Three-Phase Series RLC Load block terminals. For a Y connection, these voltages are the phase-to-ground or phase-to-neutral voltages. For a delta connection, these voltages are the phase-to-phase voltages.

Select Branch currents to measure the three total currents (sum of R, L, C currents) flowing through each phase of the Three-Phase Series RLC Load block. For a delta connection, these currents are the currents flowing in each branch of the delta.

Select Branch voltages and currents to measure the three voltages and the three currents of the Three-Phase Series RLC Load block.

Place a Multimeter block in your model to display the selected measurements during the simulation. In the Available Measurements list box of the Multimeter block, the measurements are identified by a label followed by the block name.

Measurement

 

Label

Branch voltages

Y(grounded)

Uag:

Y(floating)

Uan:

Y(neutral)

Uan:

Delta

Uab:

Branch currents

Y(grounded)

Iag:

Y(floating)

Ian:

 

Y(neutral)

Ian:

Delta

Iab:

Load Flow

Specify the load type.

If you select constant Z, the load impedance is determined from the nominal phase-to-phase voltage Vn, active power P, and reactive power (QL-QC) specified on the Parameters tab of the block dialog box. During the load flow solution, the impedance is kept constant. The effective P and Q are therefore varying proportionally to the square of the bus voltage computed by the Load Flow tool.

If you select constant PQ, the active power P and reactive power Q are kept constant and equal to the values specified on the Parameters tab of the block dialog box. When you apply the load flow solution to the model (by clicking the Apply button of the Load Flow tool), the Nominal phase-to-phase voltage Vn parameter on the Parameters tab is automatically adjusted to the phase-to-phase bus voltage computed by the Load Flow tool.

If you select constant I, the load current is kept constant at its nominal value determined from base voltage specified in the dialog box of the associated Load Flow Bus block and from active power P and reactive power QL and QC specified on the Parameters tab of the block dialog box. The effective P and Q are therefore varying proportionally to the bus voltage computed by the Load Flow tool. When you apply the load flow solution to the model (by clicking the Apply button of the Load Flow tool), the p.u. value of the nominal voltage Vn on the Parameters tab is automatically adjusted to the square root of the load voltage (in pu) computed by the Load Flow tool.

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced before R2006a

See Also

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