Dear Anuj,
The mass, center of mass, and inertias of the rotor-nacelle assembly of the WindPACT 1.5-MW turbine are documented in my Nov 23, 2009 post in the following forum topic: Tower fore-aft modes shapes.
You can derive the mass, center of mass, and inertias of the full wind turbine (rotor + drivetrain + nacelle + tower) using a FAST linearization analysis. The easiest way would be to use the following settings in FAST:
Disable all of the flexible mode DOFs of the wind turbine and only enable the 6 platform DOFs (found in PtfmFile).
Disable all turbine controls, disable aerodynamics, and set RotSpeed to 0.0.
Enable the linearization mode, by setting AnalMod to 2.
In the LinFile, set CalcStdy to False (to linearize about the initial conditions) and set MdlOrder to 2 (to get a second order linearized model).
Run FAST.
This linearization will return the 6x6 rigid-body mass matrix of the full wind turbine, which contains the mass (upper-left quadrant), center of mass (upper-right/lower-left quadrants), and inertias (lower-right quadrant) relative to the platform reference point.
Best regards,