Certifs, that's how they run in Tassie. Methinks the alternators are multiphase...but they definitely feed into the substation as DC...can you imagine phasing more than 10 individual alternators spinning in marginally different wind conditions? ...my info is second hand, the brother does the contract work for comms for TasHydro.
That comment re 47hz...imagine turbine and alternator weigh in about 800tonne of inertia spinning at 3000 rpm...imagine that slows..or wants to slow by 6%. That alternator becomes a motor and the grid wants to drive it back to 50hz...800t spinning and the grid wants to drive it? ...but it only slowed by 180rpm? It may as well be 1800rpm out!
Re Eastenders, that excess load is normally taken up by hydro. Quick start...very much unlike random wind.
Seriously, if there was no interconnector and no wind generation, SA would have only suffered local load shedding! The great social experiment is a bust!