High voltage inverter for high voltage motor has great energy saving and high efficiency, and has been widely used. The cascaded H-bridge multilevel converter adopts the modular design concept. The functions of high voltage and high power are realized by cascading multiple identical low voltage conversion units, and the output current harmonic of the converter is small. Pole-phase modulation induction motor can combine the control method of traditional three-phase motor with pole-phase modulation mode to expand the ranges of motor torque and speed. A cascaded H-bridge multilevel frequency converter is introduced to drive a pole-phase modulation induction motor with 9-phase 4-pole and 3-phase 12-pole stator windings. The simulation results show that the cascaded H-bridge multilevel converter can meet the performance of the variable frequency speed regulation and pole-phase modulation vector control of pole-phase modulation induction motor, providing technical support for high-voltage and high-power fields such as new energy power generation, ship propulsion and industrial transmission.