消除直流母线负电流的混合脉冲宽度调制相电流重构策略OA

To address the negative DC-link current generated in two-level inverters during single-sensor phase current reconstruction using the traditional measurement vector method,this paper first analyzes the relationship between PWM pulses and phase current angles corresponding to different voltage vectors.By defining source-type and sink-type voltage vectors,the mechanism behind the generation of negative DC-link current in the traditional measurement vector method and its detrimental effects are revealed.Subsequently,by adjusting the pulse widths of two-phase PWM signals and dynamically inserting source-type and sink-type voltage vectors in unobservable regions,a hybrid PWM phase current reconstruction strategy is proposed,which effectively eliminates the negative DC-link current.Finally,experimental results under various operating conditions demonstrate that the proposed method effectively eliminates negative DC-link current,reduces DC-link voltage fluctuations,and minimizes the impact of zero-drift on reconstruction accuracy.The total harmonic distortion of the phase current is below 3.24%,while the reconstruction error is less than 3.45%.