双三相永磁同步电机单通道运行中负序电流的分析与抑制

In high-power applications, such as wind power generation, dual three-phase permanent-magnet synchronous machines (PMSMs) with two power conversion channels grow in popularity owing to decent fault-tolerant capability. This letter focuses on the current control of dual three-phase PMSMs with zero angle displacement, particularly in scenarios where one channel experiences a malfunction. The influence of asymmetric mutual-inductances on negative-sequence current is investigated. Subsequently, a harmonic control method based on non-integer sliding discrete Fourier transform is proposed to suppress the undesired current harmonics. No additional parameter tuning or digital filters are required, which facilitates engineering implementation and integration. Experimental results on a down-scaled drive system validate the effectiveness of the proposed method.