Adjacent Vector Harmonic Suppression SVPWM Strategy for Symmetric Six -Phase PMSG

The vector of a multiphase permanent magnet synchronous motor (PMSM) will be mapped to three decoupled orthogonal subspaces, where the large number of harmonics present in the xy subspace not only do not participate in electromechanical energy conversion, but also increase motor losses and reduce efficiency. This paper proposes an adjacent vector harmonic suppression pulse width modulation strategy (AVHS-SVPWM) to improve the modulation strategy for symmetrical six-phase permanent magnet synchronous generators (PMSG). This strategy utilizes the different mapping relationships of each vector in different sub planes, and the selected vectors ensure the minimum switching action each time and eliminate harmonics in the xy subspace as much as possible. Simulation results demonstrate that the proposed modulation strategy controls the harmonic current in the xy subspace below 5e-4A. Compared with the traditional dual dq SVPWM, the proposed modulation strategy diminishes the current level of the xy subspace by three orders of magnitude, thereby laying the foundation for improving the control performance of the symmetrical six-phase PMSG.