The alternator needs to be powered too, so have losses on two areas.Which brings me to the question: Why not drive whatever you need to drive directly?
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On a simple strategy, assume the efficiency of an alternator will be about 60% and voila 30KW / 0.6 = 50KW 3 phase alternator..
I cannot specify output frequency because you do not specify how many poles your motor winding's have..
Have a rotary day :-)
What voltage does the motor require. OR what is the KVa from the label
30 Kw is a BIG load for an alternator (unless your talking industrial scale and an Industrial price)