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This is a first try to replicate what I see in the field.. normally it is sharper and the spikes are more symmetrical..

What is your 3 phase source?

How much like the 20mR source you have used in CL does the real source look?

Have you included the ESR of the 4700uF smoothing cap?

You might also like to compare your circuit with:

for a few any clues ...

BTW, naming nodes helps other find where voltages are being probed. V(un3) is not very obvious.

:)

Yep ... The Nodes need naming. The values are ball park values for supplies for a building.

Still some work to do. :-)

Just named some nodes and reduced the load on the DC Bus. looks better.