Can anybody explain the different on what the required power from 3 phase L-L voltage of 115VAC generator using a half or full rectification to a 3KW load?
Well, then power is 3kW so the power doesn't chnage. The way it is drawn from the supply changes, and with half-wave rectification it will all be in one half-cycle repeating at the line frequency, where with full-wave rectification it is drawn in two pulses repeating at double the line frequency.
Half-wave rectification will introduce DC into the machine winding which is almost guaranteed to cause problems because the magnetic core will saturate. Don't do it.
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If we learn from our mistakes I'm getting a great education!
Half is usually not good because it will DC saturate the generator if the load is comparable in size to the generator. Full is better because you will not get a DC component.
Otherwise, I don't mind if it is half full or whatever.
It will depend on what happens after the rectification. In a classic DC supply, there are capacitors that filter the ripple. These provide sufficient charge to carry the load through the missing phases, but there will be serious droop during the missing phases. With full-wave, the droop is the same through all the phases.
