【目的】本文聚焦于准同步运行双馈直线电机(DFLM)动子电流矢量控制的定子磁场定向问题。针对高速磁浮应用工况下由于动子磁动势远大于定子磁动势而导致的定子磁场信息难以获取问题，以及悬浮控制中动子电流存在谐波注入问题，本文创新性地提出了一种基于动子固结α-β坐标系的定子磁场定向方法及其相应的参数校正方法。【方法】该方法通过误差分析和参数校正，获得足够精度的动子侧参数，从而直接在动子绕组中精确求解占比较小的定子反电动势用于磁场定向。【结果】基于DFLM试验平台对所提方法进行验证，结果表明，在足够精度的动子侧参数下,该磁通观测算法能使定子电流T^轴分量收敛并稳定于0 A，实现磁场定向。【结论】本文所提方法能获得足够准确的动子参数，并达到良好的磁场定向效果。且不受动子电流谐波注入的影响，能保持良好的动态性能，维持稳定的磁场定向。

[Objective] This article focuses on the challenges of stator magnetic field orientation in mover current vector control for the quasi-synchronous operation of a doubly-fed linear motor (DFLM). In high-speed maglev applications, the mover magnetomotive force significantly exceeds that of the stator, making it difficult to obtain accurate stator magnetic field information. Additionally, harmonic injection in the mover current during levitation control presents further challenges. To address these issues, this paper introduced an innovative stator magnetic field orientation method based on a mover-fixed α-β coordinate system, along with a corresponding parameter correction method. [Method] By conducting error analysis and parameter correction, the proposed method determined the mover-side parameters with sufficient precision. This enabled the direct and precise calculation of the relatively small stator back electromotive force in the mover windings, facilitating magnetic field orientation. [Results] The proposed method was validated on a DFLM test platform. The results demonstrated that, with sufficiently precise mover-side parameters, the flux observation algorithm successfully converged the T^-axis component of the stator current to zero, thereby achieving effective magnetic field orientation. [Conclusion] The proposed method accurately determined mover parameters and achieved reliable magnetic field orientation. It was unaffected by harmonic injection in the mover current, maintaining good dynamic performance and ensuring stable magnetic field orientation.

国家自然科学基金项目(52202448)