Continuous and stable acquisition of accurate three-phase currents information is critical to vector control. The immeasurable areas (IAs) is the most intractable problem in the traditional single current sensor phase current reconstruction (SCS-PCR) technology. In addition, the change of the sampling position owing to the influence of the IAs makes the current ripple tend to be serious, which further increases the current distortion and decreases the current reconstruction accuracy. This article is the first to investigate the influence of the IAs and the current ripple of SCS-PCR. A midpoint value (MPV) random space vector pulsewidth modulation (RSVPWM) reconstruction strategy is proposed, which is based on the Thevenin equivalent circuit of the sampling circuit of SCS-PCR. RSVPWM constructs a current sampling window that satisfies the minimum sampling time to complete two sequential samplings, while the MPV strategy obtains the mean value of two sampling values in the in-phase dynamic current to reduce current ripple. The proposed MPV RSVPWM reconstruction strategy does not require the insertion of redundant voltage vectors and major computation and is not limited to a particular PWM technology. The experimental results verify the accuracy and practicability of the proposed method.

中文翻译：

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考虑电流纹波的三相电压源逆变器电流重构


连续稳定地获取准确的三相电流信息对于矢量控制至关重要。不可测区（IAs）是传统单电流传感器相电流重构（SCS-PCR）技术中最棘手的问题。另外，由于IA的影响，采样位置的变化使得电流纹波趋于严重，进一步增大了电流失真度，降低了电流重构精度。本文首次研究了 IAs 和 SCS-PCR 电流纹波的影响。基于SCS-PCR采样电路的戴维南等效电路，提出了一种中点值（MPV）随机空间矢量脉宽调制（RSVPWM）重构策略。 RSVPWM构造满足最小采样时间的电流采样窗口来完成两次顺序采样，而MPV策略则获取同相动态电流中两个采样值的平均值以减少电流纹波。所提出的MPV RSVPWM重构策略不需要插入冗余电压矢量和大量计算，并且不限于特定的PWM技术。实验结果验证了该方法的准确性和实用性。