Voltage and current THD of solar inverters

[MikiBg]

Hi all!
I was dealing with manufacturer's data about THD at solar inverter's output, in order to use it for harmonic load flow calculation.
It wasn't clear whether voltage or current THD is specified. I have searched for other data sheets from different manufacturers, and it looks like THD of output current is given usually within data sheets.
Can someone tell me:
1. How current harmonic distortion may be specified without assuming some concrete type of load? Various type of load should have various impact on current distortion.
2. For harmonic load flow purposes, usually some content of each typical current harmonic order is assumed, and device is represented as current source. Is it correct to use voltage harmonic content (assuming that data is available) and model inverter as voltage source within solar plant's electrical scheme?
Regards,
Miki

 

[jghrist]

Generally, harmonic sources are considered as current sources for analysis purposes. Look at IEEE Std 519 for an explanation of why this is so.