integration of renewable resources in IEEE33bus system

Hello all ,

i am working on IEEE33bus system with 11kv , 50hz

and i want to add wind energy source and pv source and also synchrounous generator to the system to study their effect on the fault current level .

i faced some problems :

1- when i inserted wind model from matlab exampls and i changed the voltage level and frequency level , i added it to bus no 33 , when i run the voltage of the main bus 1 dropped from 11kv to 10.5kv and when i simulated fault , the current were less than the case when there is no wind source which doesn't make sense!

2- when i added pv system to same bus 33 , when i run , all busses voltages and currents are very large and not logic (4e96!) and i dont know what is wrong