The dc bus current sampling technology with the traditional space vector pulsewidth modulation (SVPWM) scheme imposes several challenges, particularly at the low-modulation region and sector boundaries, where the duration of a nonzero vector may be so short that the phase current cannot be measured reliably. A new dc bus current sensed SVPWM (SSVPWM) method is proposed, in this article, to overcome shortcomings of the traditional algorithm. By introducing the concept of minimum sampling time, the unobservable area of the dc bus sampling system is divided accurately. Then, the SSVPWM and associated current reconstruction strategy are proposed by inserting the measurement vector and the compensation vector. Finally, experiments were performed on a 2.7-kW permanent magnet synchronous motor (PMSM), and the experimental results showed that the current sampling error of the proposed SSVPWM is less than 2% and the THD of three-phase current is less than 4.9%, which provides accurate current feedback for high-performance vector control.

中文翻译：

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三相逆变器的直流母线电流感测空间矢量脉宽调制

具有传统空间矢量脉冲宽度调制（SVPWM）方案的直流总线电流采样技术带来了一些挑战，特别是在低调制区域和扇区边界，在这些区域中，非零矢量的持续时间可能太短，无法测量相电流可靠地。本文提出了一种新的直流母线电流感测SVPWM（SSVPWM）方法，以克服传统算法的缺点。通过引入最小采样时间的概念，可以精确地划分直流总线采样系统的不可观察区域。然后，通过插入测量矢量和补偿矢量，提出了SSVPWM及相关的电流重构策略。最后，我们在2.7 kW永磁同步电动机（PMSM）上进行了实验，