You can analyze the active and reactive power supplied or imported from the grid correlated with the solar radiation and temperature to obtain a load curve.  

Ajan

You can perform sensitivity analysis on the system, i.e see page 59 of this thesis on power optimization for a shopping mall

http://www.slideshare.net/AristotelisGiannopoulos/energy-systems-optimization-of-a-shopping-mall

regards

Gerro

You may explore power quality issues such as voltage fluctuations, harmonics injections, reactive and active power with the integration of grid. If you need any further information let me know.

See this article"PSCAD Simulation of Grid-Tied Photovoltaic

Systems and Total Harmonic Distortion

Analysis" by Abdulrahman Y. Kalbat, Member, IEEE. I will send you.