3 Phase VSC using SPWM

See figure attached for the question.

Here is my attempt at the solution,

1)

|S| = |P + jQ|

S = √((20k)² + (12k)²) = 23323.808 = √(3)VLLRMS*IlineRMS

VLLRMS = 897.73V

2)

Since VLLRMS = VLNRMS = (mVdc)/√(2) = 897.73V

Vdc = 1586.98V

I'm pretty sure I've made a mistake somewhere I'm just not sure where.

Any help?