Power transistors can be had that can switch up to maybe 3000V at the most. But maybe 1200-1500V is more common.
You can stack power transistors to switch higher voltages on the primary side. On the secondary side you just need an H-bridge. Which can be made up of transistors in parallel.
We've had high power high voltage transistors for about 40 years now. A lot of this isn't technical but rather economic. As the price falls the applications where they are cheaper increases. It's notable for instance Toyota started work on their hybrid drive in the mid nineties when inverters for 10-100 HP motors became cheap enough.
You can stack power transistors to switch higher voltages on the primary side. On the secondary side you just need an H-bridge. Which can be made up of transistors in parallel.
We've had high power high voltage transistors for about 40 years now. A lot of this isn't technical but rather economic. As the price falls the applications where they are cheaper increases. It's notable for instance Toyota started work on their hybrid drive in the mid nineties when inverters for 10-100 HP motors became cheap enough.