For the original post and more infomation, please visit:

http://www.nrel.gov/electricity/transmission/news/2014/15429.html

The National Renewable Energy Laboratory (NREL) has released the User Guide for PV Dynamic Model Simulation Written on PSCAD Platform, which describes a tool developed at NREL for modeling the dynamic behavior of photovoltaic (PV) inverters in the power system network environment.

Another related technical report: PSCAD Modules Representing PV Generator