The twelve-phase open-winding motor system has the advantages of good redundancy and small torque ripple. It is the first choice for large-capacity propulsion of ships. However

the open-winding motor system has the problem that the zero-sequence current is difficult to suppress. According to the phase characteristics of twelve-phase induction motor (four sets of three-phase difference of 15°)

an eight-dimensional Park transformation matrix and its inverse transformation matrix are proposed in this paper. Four sets of zero-sequence current and its inverse signal are transformed into direct current after eight-dimensional Park transformation. The proportional integral regulator is used to output the compensation voltage

and the eight-dimensional Park inverse transformation is superimposed on the original control modulation wave to realize the closed-loop control of zero-sequence current. Compared with the traditional quasi-proportional resonant zero-sequence current suppression method

the proposed method can significantly improve the zero-sequence current suppression effect and avoid the problem that the zero-sequence current is not well suppressed due to the bandwidth limitation of the overcurrent loop due to the high frequency. Finally

the feasibility and correctness of the proposed algorithm are verified by simulation and experiment.