Wide-voltage hybrid direct-current power electronic transformer

The invention discloses a wide-voltage hybrid direct-current power electronic transformer, and relates to the technical field of voltage conversion devices. The transformer comprises more than one wide-voltage phase-shifting type direct-current converter and more than two resonance type direct-current converters, and the direct-current converters meet the high-voltage and high-power use requirements of a power grid by adopting an input-output series-parallel connection mode. According to the invention, active adjustment of transmission power or output voltage is realized through a wide-voltage phase-shifting direct-current converter in the hybrid direct-current power electronic transformer; the resonant direct-current converter works in a resonant state and automatically adjusts transmission power according to the change of input and output direct-current voltage; a pulse interleaving control technology is adopted among the plurality of direct-current converters so as to reduce ripples of input and output dir