How to obtain the state matrix of a power system model developed in SIMULINK?

I have created a power system to study generator behavior in SIMULINK. The machine has been modelled with its 4-mass turbine components. Further, transmission lines too have been modelled. I wanted the system matrix "A" for this arrangement. Is that possible? I want to see which variables are observable and other variables which can be controlled. It would be great if anyone could shed light on any of the above aspects. Thank you.