Topology of energy-fed three-port cascade converter of hexagonal structure and control method

The invention relates to the technical field of power electronic converters, in particular to topology of an energy-fed three-port cascade converter of hexagonal structure and a control method, The topology effectively combines a hexagonal converter with a traditional H-bridge cascaded multilevel converter driven by the existing medium and high voltage system motors, and then connects it with theAC power network through the multi-winding phase-shifting transformer, so that it can be extended to a three-port structure with single input and two outputs, which can meet the operating requirementsof the two-motor system under different operating conditions. As the front-end input is added to the module units on part of the bridge arm of the hexagonal converter, the number of power electronicdevices and the secondary side windings of the phase-shifting transformer required by the converter can be greatly reduced. At the same time, in order to solve the problem of system power imbalance caused by the default of fron