How to measure the output impedance of single-phase and three-phase inverters connected to the grid?

I need a method to measure the output impedance of single-phase and three-phase grid-connected inverters and then build the Bode diagram for the measured impedance.

Additionally, I am also interested in measuring the impedance seen by the grid.

The model I built was created in the following library: Simscape / Electrical / Specialized Power Systems

The schematic figure of the single-phase case is this:

Answer 1

[Joel Van Sickel]

I would start with this block: https://www.mathworks.com/help/physmod/sps/powersys/ref/impedancemeasurement.html

but more generically, you can use the frequency response estimator tool in simulink control design to extract frequency response of your circuit as well. Here are some useful links if you want to look at more customizeable options:

https://www.mathworks.com/help/slcontrol/ug/frequency-response-estimation-to-measure-input-admittance-of-boost-converter.html

https://www.mathworks.com/help/physmod/simscape/ug/linearize-an-electronic-circuit.html

Regards,

Joel

[Jefferson]

Thank you very much Joel. I used the Impedance Measurement block and it worked very well.

Regards

[Subin Puthenkalam]

Hello Jefferson,

can you show how your impedance measurement result looks like?

Does it has resonance points?

Thanks in advance