Three-phase series winding topology voltage modulation method and system for suppressing common-mode interference

Abstract

This invention discloses a three-phase series winding topology voltage modulation method and system for suppressing common-mode interference, belonging to the field of AC drives and their common-mode suppression. The method includes: receiving a reference voltage vector command V. ref V ref Projecting onto the αβγ axis yields V ref‑α V ref‑β and V ref‑γ From all voltage vectors that can be generated by a three-phase series winding topology with a common-mode voltage amplitude of 0 and non-zero in γ space, the first voltage vector is selected for synthesizing V. ref‑γ According to V ref‑α V ref‑β And the voltage projection of the first voltage vector in the αβ plane, and the selection of the second voltage vector from all non-zero voltage vectors that can be generated in γ space by the three-phase series winding topology; to generate V ref‑α V ref‑β and V ref‑γ To achieve the desired effect, the duration of each voltage vector in the first and second voltage vectors is calculated to modulate the three-phase series winding topology. This simultaneously achieves common-mode rejection and zero-axis current control.

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