Is the renewables project stepping up from the low side to the high and  how is the renewable source organized -
1) does it have a neutral capable of sourcing and sinking significant current for a start ?

2) what sort of waveforms are expected - is it just rectangular current pulses, resonant conversion or something  more sophisticated?

At  least in the UK HV transmission is normally neutral free, and to that end star - delta transforming is used and as well as making for easier wiring, it also means that 3rd order harmonics run round the delta but don't get sent out over the wire.

Generally NER wont help supress harmonics on its own, but suitably placed inductance might.

M.

Is the renewables project stepping up from the low side to the high and  how is the renewable source organized -
1) does it have a neutral capable of sourcing and sinking significant current for a start ?

2) what sort of waveforms are expected - is it just rectangular current pulses, resonant conversion or something  more sophisticated?

At  least in the UK HV transmission is normally neutral free, and to that end star - delta transforming is used and as well as making for easier wiring, it also means that 3rd order harmonics run round the delta but don't get sent out over the wire.

Generally NER wont help supress harmonics on its own, but suitably placed inductance might.

M.