SCIM with Saturation

The SCIM With Saturation example demonstrates the effects of saturation on the IM with Saturation machine model. Two identical squirrel-cage induction machines are simulated, one with typical saturation characteristics and the other without saturation. Both machines are powered by the same three-phase voltage source simulated using the built-in FPGA Sinewave Generators. At the output of the machines, we measure and compare the amplitudes of their respective A, B, and C phase currents to observe the effects of saturation on the model.

Example Directory	<Public Documents>\National Instruments\<NI VeriStand 20xx>\Examples\OPAL-RT\Power Electronics Add-On\SCIM With Saturation
Project Path	<SCIM With Saturation>\Project\SCIM With Saturation.nivsprj
Reference Documentation	IM with Saturation

Opening and Deploying the Example

To avoid modifying the original example, make a local copy of the Example Directory shown above.
Open VeriStand and Browse to the VeriStand Project (.nivsprj) file at the Project Path in the copied directory.
Click Configure... to open the System Definition file.
Enter the IP Address of the Real Time target in the Controller page.
If permissions are configured on the Real Time target, enter the credentials in the Username and Password fields.
Save and close the System Definition file.
Click Operate >> Deploy.

Open the VeriStand Screen (.nivsscr) files and manipulate the parameters in the blue boxes to observe the resulting output signals. The configuration information displayed in grey is for informational purposes only; these parameters can only be modified from the System Definition file while the project is undeployed.

Observing Machine Signals

Open Main.nivsscr and monitor the Stator Phase Currents and Speed of both machines. Manipulate the Supply Voltage and observe its effects on the output signals.

Comparison of the machine Phase Currents and Speed with a Supply Voltage of 460V.

Interpreting the Results

This example can be used to validate the saturation parameters defined in the Magnetizing Inductance File. By manipulating the Supply Voltage, we can observe the phase currents output by the saturated machine model at various operating points along the saturation curve. A second machine with linear parameters is also simulated to help compare the effects of a machine with no saturation.

The table and graph below summarize the saturation parameters defined in the Magnetizing Inductance File, as well as the results obtained from the saturated machine model. Note that the measured phase currents obtained from the simulation are peak values, while the currents defined in the Magnetizing Inductance File are RMS values.

Saturation Parameters			Simulation Measurements

Saturation Parameters			Simulation Measurements
Supply Voltage (Vrms L-L)	No Load Stator Current (Arms)	No Load Stator Current (Apeak)	Peak Stator Phase Current (Apeak)
230	9.9249	14.03592819	13.9
322	19.6672	27.81362097	28
414	38.0377	53.79343122	53.7
460	51.3988	72.68888005	72.75
506	69.2824	97.98010971	97.47
552	105.1337	148.6815044	148.16
598	152.5532	215.7428044	214.97
644	214.2421	302.9840835	301.27
690	302	427.0924958	423.05

Comparison of the saturation parameters defined for the machine model and the simulation results.