An Advanced Harmonic Compensation Strategy for Dual Three-Phase Permanent Magnet Synchronous Machines Considering Different Angle Displacements

Dual three-phase permanent magnet synchronous machines (dual 3-ph PMSMs) have been used in industrial applications, due to high reliability, high torque density and other advantages. This paper proposes a current harmonics compensation strategy for dual 3-ph PMSMs with 0°, 30° and 60° angle displacement (AD) based on the developed generalized decomposition model. Firstly, a decomposition matrix of dual 3-ph PMSMs with 60° AD is extended to dual 3-ph PMSMs with 0° AD, together with a comparison with double d-q reference frame. A generalized decomposition model for dual 3-ph PMSM with 0°, 30° and 60° AD is then formed. Based on this generalized model, an advanced current harmonic compensation strategy is developed, in which dominant order current harmonics are selected without introducing a phase delay (by means of the generalized integrator), and a model-based control approach is introduced to mitigate the selected harmonics. Finally, simulation and experimental results validate the performance of the proposed harmonic compensation strategy.