Abstract: In order to drive multi-motor in industrial field and recycle their regenerative energy,a tri-port cascaded multilevel converter for two-motor asynchronous drive was proposed.The H-bridge cascade multilevel converter and the hexagonal topology were combined to form a tri-port AC/AC/AC system,in which the front end in each cell of H-bridge converter was connected to the main grid by a phase shifting transformer as the in-port,and the two out-port were connected to the endpoints of the hexagonal converter.Considering the analysis of power distribution,two different control instructions based on V/f control were sent to drive two asynchronous-operation motors.The six branches of converter equaled to two sets of coupling three-phase symmetric power,through which the regenerative energy from the generated motor can be supplied to another one in motoring mode directly.So a new method of energy conservation was proposed,and the voltage increase of the cell’s DC-link capacitor was suppressed.A tri-port cascaded multilevel converter with twelve cells,six branches was taken as an example.The simulation in Matlab/Simulink and experimental platform were built.The results demonstrate the effectiveness of the proposed topology and control strategy.