Grounded Neutral (Three-Phase)

Connect phases of three-phase system to electrical reference

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Libraries:
Simscape / Electrical / Connectors & References

Description

The Grounded Neutral (Three-Phase) block connects the phases of a three-phase system to ground.

Note

To create a neutral point that you can connect to blocks with single-phase ports, use the Neutral Port (Three-Phase) block. To create a floating neutral point, use the Floating Neutral (Three-Phase) block.

Examples

Earthing Effects with Unbalanced Load

The effects of three different types of earthing connections on network voltages and currents.

• Open Model

Three-Phase Asynchronous Direct Online Motor Connected to Hydraulic Pump

In this example, an asynchronous motor is connected to an ideal pump. The diameter of the valve on the hydraulic system affects the speed and current drawn by the motor.

• Open Model

Three-Phase Custom Synchronous Machine

A custom Simscape™ implementation of a Synchronous Machine (SM). To view the SM source code, double-click on the Synchronous Machine block and then click on the hyperlink 'Source code'.

• Open Model

Three-Phase Bridge Cycloconverter

A three-phase bridge cycloconverter. The cycloconverter consists of 36 thyristors and has the capacity to lower the frequency of the input voltage. The Control subsystem implements the cycloconverter RMS voltage control. It also provides pulse generation for the firing of the thyristors. The Visualization subsystem contains scopes that allow you to see the simulation results. The simulation time, t, is 1 second. The load increases when Load1 switches on at t = 0.75 seconds.

• Open Model

Ports

Conserving

~ — Composite three-phase port

electrical

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.

a — Phase a of three-phase system

electrical

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.

b — Phase b of three-phase system

electrical

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.

c — Phase c of three-phase system

electrical

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.

Parameters

Electrical connection — Whether to model composite or expanded three-phase ports

Composite three-phase ports (default) | Expanded three-phase ports

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"

Extended Capabilities

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

Version History

Introduced in R2013b

R2026a: The Modeling option parameter has changed

The Modeling option parameter has been replaced with the Electrical connection parameter. You can now also set this parameter value programmatically by using the set_param function.

If you created a model containing this block in an earlier release, the software now automatically sets the value of the Electrical connection parameter to the previous value of the Modeling option parameter.