Parameterisation of the non-linear inductor in Matlab/Sim​ulink->Sim​ulation Environmen​t->Electri​cal->Speci​alised Energy System

Good day,

I have a problem, I do not understand the parameterisation of the nonlinear inductor. I want to create a simple series resonant circuit with this coil to simulate ferroresonances. Unfortunately, I don't understand how to parameterise this block in Matlab/Simulink. As I said, I have a simple series resonant circuit. The source voltage is 4kV, the capacitor has a capacitance of 8μF and the coil has data of 5.093 H unsaturated and 35.36mH saturated. I also have a current-voltage curve for the operating frequency that represents the voltage across the coil in the operating case, but unfortunately I don't know how to set this block. I would like to simulate the voltage curve so that it looks like the results in the picture.

Can anyone help me?

Thank you very much.

Answer 1

[Yash]

Hi @Rene Schwitte,

I understand that you want to parameterize the "Nonlinear Inductor" block and simulate the voltage curve according to your current-voltage curve.

Follow these steps to parameterize the "Nonlinear Inductor" block:

1. In the "Library Browser" navigate to "Simscape" > "Electrical" > "Passive". Drag and drop the "Nonlinear Inductor" into your Simulink model.
2. Double-click on the "Nonlinear Inductor" block to open its block parameters.
3. Against the parameter "Unsaturated inductance", enter the value 5.093 and select the unit as "H" from the drop-down.
4. Against the parameter "Saturated inductance", enter the value 35.36 and select the unit as "mH" from the drop-down.

To simulate the voltage curve, you can use any of the following two methods:

• Use a "Lookup Table" ("1-D Lookup Table" in this case). Enter the voltage and current values in the "Table data" and "Breakpoints". You can either manually enter the values or import the data from a data file. You can choose the appropriate interpolation method in the "Interpolation method" parameter.
• Use a "MATLAB Function" block. Double-click on the "MATLAB Function" block and write the equation of voltage as a function of current.

I hope this helps!