Power electronic transformer for alternating current/direct current distribution network

The present invention provides a power electronic transformer for an alternating current/direct current distribution network. The power electronic transformer for the alternating current/direct current distribution network comprises an input stage, an isolation stage DC-DC converter and an output stage; the input stage is an MMC structure and comprises a plurality of clamping twin sub-modules which are connected in series; the isolation stage DC-DC converter comprises DC/AC modules, high-frequency transformers and AC/DC modules, the number of the DC/AC modules, the high-frequency transformers and the AC/DC modules being the same with the number of the sub-modules of the input stage; the direct current inputs of the isolation stage are connected with the CDSM direct current output ends of the sub-modules, and the isolation stage and the sub-modules share a capacitor; the direct current output ends of the isolation stage are connected in parallel through the sub-modules; and the output stage comprises one or mo