Power electronic transformer

A power electronic transformer, comprising three modules, the three modules each comprising:

• a first submodule comprising a first input port and N output ports, where N is an integer greater than 0;
• a second submodule comprising a first input port and M output ports, where M is an integer greater than 0;
• and
• a third submodule comprising a first power conversion module and a second power conversion module,
• the first power conversion module comprises N first power conversion units having input ports connected to the N output ports of the first submodule in one-to-one correspondence,
• the second power conversion module comprises M first power conversion units having input ports connected to the M output ports of the second submodule in one-to-one correspondence,
• the first input port of the first submodule of the three modules has one terminal connected to three phases of a first three-phase alternating current in one-to-one correspondence, and an other terminal connected to three phases of a second three-phase alternating current in one-to-one correspondence,
• the first input port of the second submodule of the three modules has one terminal connected to three phases of the first three-phase alternating current in one-to-one correspondence, and an other terminal connected to a neutral point, and
• output ports of the N first power conversion units of the three modules are connected in parallel to output ports of the M first power conversion units to form a DC bus for powering a load.