This article first proposes a generalized decomposition model for dual three-phase (3-ph) permanent magnet synchronous machines (PMSMs) with 0°, 30°, and 60° angle displacements between two sets of windings, allowing machines controlled in two-dimensional orthogonal αβ and xy subspaces. This model can decouple mutual inductances coupling phases from two sets, respectively. However, there often exist asymmetric impedances, due to inherent asymmetric machine parameters, cables with unequal lengths, manufacture tolerances, etc., in dual 3-ph PMSMs inevitably causing unbalanced phase currents and deteriorating the decoupling performance of the generalized machine model. Therefore, the generalized decomposition model incorporating asymmetric impedances is further developed, in which additional terms incurred by asymmetric impedances lead to the cross-coupling of αβ subspace and xy subspace. Through this model, the compensation capability of asymmetries is derived at a given dc link voltage. Then, a compensation strategy is illustrated to suppress unbalanced phase currents together with current harmonics caused by nonlinearities. Finally, experimental results testify the current balancing performance and simulation results further validate the machine model and the compensation capability.

中文翻译：

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考虑不对称阻抗和补偿能力的双三相永磁同步电机广义分解模型


本文首先提出了两组绕组之间具有 0°、30° 和 60° 角位移的双三相 (3-ph) 永磁同步电机 (PMSM) 的广义分解模型，允许以二维方式控制电机正交 αβ 和 xy 子空间。该模型可以分别对两组耦合相的互感进行解耦。然而，由于固有的不对称机器参数、长度不等的电缆、制造公差等，双三相永磁同步电机中经常存在不对称阻抗，不可避免地导致相电流不平衡，并恶化广义机器模型的去耦性能。因此，进一步发展了包含不对称阻抗的广义分解模型，其中由不对称阻抗引起的附加项导致αβ子空间和xy子空间的交叉耦合。通过该模型，可以得出给定直流母线电压下的不对称补偿能力。然后，阐述了一种补偿策略，以抑制不平衡相电流以及非线性引起的电流谐波。最后，实验结果验证了电流平衡性能，仿真结果进一步验证了电机模型和补偿能力。