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

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Jefferson
Jefferson 2022-5-25
编辑： Subin Puthenkalam 2022-6-28
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:

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Joel Van Sickel
Joel Van Sickel 2022-6-13
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

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