Shen Yongpeng1, Wang Qiancheng1, Wang Yanfeng1, Yuan Xiaofang2, Li Hailin1
1. College of Electrical and Information Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China; 2. College of Electrical and Information Engineering Hunan University Changsha 410000 China
Abstract：The phase current reconstruction of a single current sensor based on the traditional space vector pulse width modulation method has an unobservable area and cannot realize the zero-point drift correction. Therefore, an error self-correcting mixed pulse width modulation method is proposed. Two complementary effective voltage space vectors are inserted in each carrier cycle of the unobservable area to replace the zero-voltage vector, which provides a reliable sampling window for the current sensor and eliminates the current unobservable area. At the same time, through the dynamic double sampling of the complementary effective voltage vector, the self-detection and self-correction of the current zero drift are realized. Under the experimental conditions, the proposed method recon- struction phase current error is less than 3.57%, and the total harmonic distortion of the phase current is less than 4.02%, which can provide a reliable reconstruction phase current for the control system.
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2022, Vol. 37 
