I am trying to connect a Line Impedance Stabilisation Network (LISN) to a three-phase PFC rectifier simulation model as I want to simulate the common-mode and differential mode EMI. Most references on this seem to be for single phase connections where two LISN networks are used, one for power supply as well as converter reference ground like shown below:
However, I am having a bit of trouble correlating this with a three-phase system. This reference seems to suggest placing a LISN in each of the phases and one in the neutral.
However my circuit(shown below) does not use the neutral terminal. Additionally, I am unable to figure out where my converter reference ground is. I have connected the LISN to each of the phases as shown below and this does not disturb my expected output, but where/how do I connect the LISN to the converter reference ground in order to obtain both common-mode and differential-mode EMI.