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I also thought you can't parallel them, but you can. I spoke to several people that actually did it. They said the hard part is IGBTs have a "negative temperature coefficient", so are subject to thermal runaway. You can be careful to keep them cool, and watch their temperature closely, and safely parallel them, it's just harder than mosfets. Mosfets tend to balance themselves in parallel because the ones that get more current increase their RdsON, lowering their current draw.
I love your idea about an AC controller! I would like to learn more about it too.
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