Power electronic transformer with cooling unit

A power electronic transformer arrangement, comprising:

• at least one frequency transformer,
• at least one first voltage unit for operating at a first voltage comprising first voltage power electronics building blocks,
• at least one second voltage unit for operating at a second voltage comprising second voltage power electronics building blocks,
• the first voltage being lower than the second voltage,
• a two-phase cooling unit comprising a two-phase cooling medium for cooling the at least one second voltage unit, and
• a water-cooling unit for cooling the two-phase cooling medium, wherein the water-cooling unit is further configured to cool the at least one frequency transformer.