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Are you sure your simulation schematic is correct?

V2 is referenced to the IGBT emitter, but M1 pulls the gate down to GND when turned on. If M1 turns on fast while the AC line is high, then the gate voltage may drop faster than the IGBT actually has turn turn off and the emitter voltage falls. This would lead to Vge going far negative, likely destroying the IGBT immediately. Also this would put a huge peak stress on R5.

Also if V3 ever stops functioning (loose wire, power loss, or some other failure), then U1 is going to turn on. Seems like a poor choice, especially if this thing is going to be delivering tens of kW.