Harmonic closed-loop model predictive fault-tolerant control of a dual three-phase permanent magnet synchronous motor

The harmonic plane is coupled with the fundamental plane for the open-circuit-fault dual three-phase permanent magnet synchronous motor (DTP-PMSM). The conventional closed-loop control in the harmonic plane caused controller conflicts owing to this coupling effect, which reduced the fault-tolerant performance of the DTP-PMSM. Thus, this paper proposes a harmonic closed-loop fault-tolerant control strategy of DTP-PMSM without controller conflict for single-phase open-circuit faults. First, a fault-tolerant prediction model is derived using a dimensionality-reduced decoupling matrix to overcome the coupling effect, and then, a set of virtual voltage vector control sets suitable for open-circuit faults is reconstructed. In addition, a harmonic voltage extended-state observer is designed to suppress the harmonic current caused by nonlinear factors. The duty cycle that needs to be compensated is quickly obtained via coordinate transformation and injected into the corrected voltage vector to complete the harmonic closed-loop control. The experimental results demonstrate the feasibility and effectiveness of the proposed method.