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How to Create a Three-Phase Source SPICE Model

Every SPICE simulation needs to have an accurate source or input signal for a realistic analysis. For testing heavy-duty power systems or loads such as AC motors, the ability to quickly simulate a three-phase source is key. PSpice allows you to quickly create the required three-phase source SPICE model, in Delta or Star (Y) configuration, for a realistic simulation.

This quick how-to will provide step-by-step instructions on how to create a three-phase source SPICE model in OrCAD PSpice.

To follow along, download the provided files above the table of contents.

How-To Video

Creating a Three-Phase Source SPICE Model

Step 1: Open the provided design in OrCAD PSpice Designer.

Step 2: Select Place > PSpice Part > Modeling Application from the menu.

Creating a Three-Phase Source SPICE Model

Step 3: In the Modeling application, expand Sources and select Independent Sources.

Step 4: Select the Three Phase tab.

Step 5: Select Star as the configuration.

Note: With a Delta three-phase source, the line voltage is equal to the phase voltage. With a Star (or Y) three-phase source, the line voltage is equal to the phase voltages times 3.

Configuring a Three-Phase Source SPICE Model

Step 6: Enter 59.94 for the Frequency and 120 for the Phase Voltage.

Note: Additional options are available to configure:

  • line voltage
  • phase voltages
  • phase lag
  • source inductance
  • source resistance
  • phase sequence

The phase and line voltages are adjusted accordingly depending on source type.

Learn how to determine the required parameters for a three-phase source SPICE Model here.

Step 7: Click Place to attach the source to your cursor.

Placing a Three-Phase Star Source Model in PSpice

Step 8: Click to place the source in the schematic.

Running the Simulation

Step 9: Select PSpice > Run from the menu.

Viewing the Simulation Results

Step 10: View the simulation results. The three sine waves are plotted with the expected phase difference of 120°.

Modifying a Three-Phase Source SPICE Model

Step 11: Back in the schematic, select the three-phase source and press Delete on the keyboard.

Step 12: Select Independent Sources from the Modeling Application.

Step 13: Select the Three Phase tab.

Configuring a Delta Source SPICE Model

Step 14: Select Delta as the phase type and enter a Phase Voltage of 120.

Step 15: Click Place.

Step 16: Click to place the delta source in the schematic.

Step 17: Click and drag to select the unconnected ground and its wires. Press Delete on the keyboard.

Step 18: Select Place > Wire from the menu, the Wire button from the toolbar, or press W on the keyboard.

Step 19: Click to connect the delta source to the unconnected wires. Press Escape when finished.

Step 20: Select PSpice > Run from the menu.

Viewing the Simulation Results

Step 21: View the results. A similar three-phase plot is shown.

Wrap Up and Next Steps

Quickly create the required three-phase source SPICE Model to accurately analyze circuit behavior with the modeling application in OrCAD PSpice. Test out this feature and more with a free trial of OrCAD. To learn how to determine the required parameters for a three-phase source SPICE Model in your circuit design, view our blog here.

Follow Along, Download the Pre-Packaged Design Files

Table of Contents

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