Fast Dual-Space Model Predictive Current Control of Five-Phase Flux-Intensifying IPM Motor With Adaptive Third-Harmonic Injection

Five-phase flux-intensifying interior permanent magnet (FI-IPM) motor has the advantages of stable parameters under multiple operations because of its inverse saliency effect, which is suitable for model predictive current control (MPCC) drive. Also, due to its rich third-harmonic content in back-EMF, third-harmonic injection method is typically adopted to improve the output torque. Yet, due to the nonoptimal injection ratio of the third-harmonic injection method and discrete vectors in the control set for the MPCC, the maximization of output torque for the five-phase FI-IPM motor cannot be achieved. To overcome this issue, a fast dual-space MPCC with adaptive third-harmonic injection is developed in this article. First, based on the VSI-MTPA strategy, this article proposes an adaptive third-harmonic injection ratio to achieve optimal injection ratio for output torque maximization. Furthermore, a fast dual-space MPCC which resynthetises and preselects virtual voltage vectors (VVVs) is proposed to realize fast and steady control of both fundamental and third-harmonic spaces. With the fast dual-space MPCC and adaptive third-harmonic injection MTPA, the algorithm complexity can be reduced while the load capacity of five-phase FI-IPM motor drive system can be improved. Finally, the feasibility and effectiveness of the proposed strategy is verified by experimental results.