Harmonic Currents Injection Strategy With Optimal Air Gap Flux Distribution for Multiphase Induction Machine

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Abstract
The proposed technique focuses on the non -sinusoidal power supply control strategy aiming to obtain the optimal air-gap flux density distribution. The electrical constraints for the alignment between rotated fundamental and harmonic air-gap flux are illustrated in detail. The supporting simulation is performed to analyze the misaligned angles between fundamental and harmonic air-gap flux for the traditional methods. Different from traditional flux-oriented methods, the improved algorithm for harmonic currents injection is designed based on rotor flux orientated control (RFOC) in fundamental plane and air-gap flux orientated control (AFOC) in harmonic planes. The synchronous and aligned control of the fundamental and harmonic air-gap flux is achieved regardless of load condition. The experimental verification is implemented based on a multiphase driving platform using a 7-phase induction machine (IM) as prototype. Various performance is provided for the proposed control strategy comparing with the traditional ones in terms of induced electromotive force (EMF) waveforms, harmonic currents and advance angles of air-gap flux. The simulated and experimental results validate the theoretical assumption and the effectiveness of the proposed method.
Funding Information
  • National Natural Science Foundation of China (51777191)
  • Natural Science Foundation of Zhejiang Province (LCZ19E070001)

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