Lucky you!

Just make sure now that the phases are split by someone with brains into logical non-cross polluting arrays on the main board. If you can pluck one phase exclusively for AV you might find that you don't need to do anything at all to condition your power.

In London, I measured on PPP the incoming THD at 1.5% max on my 3-phase supply, but I suspect that outside of London you might get even better results, even down below 1% (unless you have an aluminium smelter and saw mill connected to the same substation:))

At my neighbour's house who runs a 2-phase supply my PPP usually shown 228V on 4% to 5% incoming THD, and even PPP with its regeneration was not able to output much below 1% THD.

M