PS Renewables

I need to model a 6600v ph-ph 3 phase system in PV SOL. I only want to do a basic 2D model but it won't let me enter correct figures in AC mains section in second screen (System Type, Climate and Grid) - it only goes to max 1000V N-L1. How do you get beyond this issue as for any stand HV system in the UK 6.6kV, 11kV, 33kV the N-L1 voltage will be more than 1000V