How to connect current sources (wind turbine) in parallel?

So far you have negative answers. Of course you must connect to the power grid in a non-disruptive manner but you knew that. I recommend that you look into the induction generator. An induction motor has a torque speed curve that is steep near synchronous speed and zero torque right at synchronous speed but if the prime mover (wind turbine) turns the motor faster than synchronous speed it will generate power and feed it into the grid in a non-disruptive manner.