how can i get a state space information of a simpowersystem simulink model using linear analysis tool

I am unable to get state space of a simpowersystem simulink model. I tried to took the help of examples given and implemented them on 3-phase ac system but could not succeded. So it will be very helpful for me if you suggest some process with the help of linear analysis tool to get it from some example given in matlab like power_svc_pss. First I tried to linearize around operating point but could not get that. So now I am asking for your help. Thanx in advance.