Wye-Connected Variable Load

R2026b

Three-phase variable load wired in wye configuration

expand all in page
  • Wye-Connected Variable Load block

Libraries:
Simscape / Electrical / Passive / RLC Assemblies

Description

The Wye-Connected Variable Load block models a three-phase variable load wired in a wye configuration. Each limb of the load contains a resistor. The block calculates the resistance required to draw the real power of the physical signal input P at the rated voltage that you specify. Therefore, the block can represent a real load.

To ensure that the resistance is always greater than zero, you specify the minimum real power that the load consumes. The minimum real power must be greater than zero.

Equations

This equation defines the resistance,

R=VRated2P,

where:

  • R is the per-phase series resistance.

  • VRated is the RMS, rated line-line voltage.

  • P is the three-phase real power required.

Ports

Input

expand all

Physical signal input port associated with the real power.

Conserving

expand all

Electrical conserving port representing the three phases of the three-phase block. For more information, see Three-Phase Ports.

Dependencies

To enable this port, set the Electrical connection parameter to Composite three-phase ports.

Electrical conserving port associated with the phase a of the three-phase block.

Dependencies

To enable this port, set the Electrical connection parameter to Expanded three-phase ports.

Electrical conserving port associated with the phase b of the three-phase block.

Dependencies

To enable this port, set the Electrical connection parameter to Expanded three-phase ports.

Electrical conserving port associated with the phase c of the three-phase block.

Dependencies

To enable this port, set the Electrical connection parameter to Expanded three-phase ports.

Electrical conserving port associated with the neutral phase.

Parameters

expand all

Since R2026a

Whether to model composite or expanded three-phase ports.

Composite three-phase ports represent three individual electrical conserving ports with a single block port. You can use composite three-phase ports to build models that correspond to single-line diagrams of three-phase electrical systems.

Expanded three-phase ports represent the individual phases of a three-phase system using three separate electrical conserving ports.

Programmatic Use

To set the block parameter value programmatically, use the set_param function.

Parameter: port_option
Values: "ee.enum.threePhasePort.composite" (default) | "ee.enum.threePhasePort.expanded"

RMS, rated line-line voltage for the resistance equation.

Minimum real power that the three-phase load dissipates when supplied at the rated voltage. The value must be greater than 0.

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"ee_lib/Passive/RLC Assemblies/Wye-Connected Variable Load"

Example: add_block("ee_lib/Passive/RLC Assemblies/Wye-Connected Variable Load","myModel/myBlock",MakeNameUnique="on")

For information about programmatic access to individual block parameters, see the Programmatic Use section of parameter descriptions on this page.

Extended Capabilities

expand all

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

Version History

Introduced in R2014b

expand all

See Also

| |

Topics