Current Balancing Control Strategy for Dual‐Channel PMSM Under Unbalanced Power Supplies

ABSTRACT The dual‐channel permanent magnet synchronous motor (PMSM) combines high torque density, low torque ripple, and strong fault tolerance, making it ideal for applications in electric vehicles, aerospace, and wind turbine generators. However, the specific existence of unbalanced power supplies leads to current harmonics and current unbalance, which increases system losses and significantly affects control performance. In this paper, an improved current control scheme is proposed to solve these problems. First of all, the proposed approach introduces a transformation matrix that reformulates two odd harmonics into one even harmonic component, reducing the number of controllers. Meanwhile, the PI controller paralleled with multiple resonant controllers is developed, considering compensation in both the d – q and x – y subspaces, so that the major harmonics are suppressed. Even under substantial voltage differences, the system achieves a marked reduction in harmonics compared to traditional unbalanced supply systems. Finally, the experimental results demonstrate that the proposed control strategy can effectively improve performance.