As Andy Stated , High voltage DC is far more dangerous than the equivalent voltage in AC. If you have to work with 200vdc then follow the techniques used by TV repair men.

Stand on a rubber mat
Work with one hand behind you back at all times (or use high voltage gloves)
do not wear any jewelry
Use Isolating transformers (for the 200vdc supply and all test equipment)
Pray Often.


If this is for testing/educational purposes - why not lower the supply voltage to 30vdc (from a laboratory type power supply where voltage and current can be closely controlled).
At 30vdc all the isolated drivers and Mosfets will work as required.