Can a triphase current regulator be used with just two phases?
For reasons you haven't explained, you seem to have access to two-phases of a three-phase supply. If you power the inverter from this you are effectively running on one phase. One likely problem is that the internal DC bus will probably not hold up will with single-phase supply.



Figure 1. Three-phase recitification provides low-ripple DC without any smoothing capacitors. Source: if a standard three-phase 400V AC connection is rectified what DC voltage comes out of it?

The single-phase varieties will have large smoothing capacitors built in to hold the DC bus voltage up during the zero-cross.

If you're thinking of adding capacitors to the three-phase unit then you need to be aware that the built-in surge protection to limit the capacitor initial charge current (they look like short-circuits when completely discharged) may be significantly different.