Reduction Mechanism of Output Voltage Distortion in Dual Output Phase-shift Distribution Transformer.

The mechanism of dual output phase-shift distribution transformer (DOPSDT) for reducing the output voltage distortion, and the relationship between the transformer harmonic impedance and windings layout structure are disaussed. Based on the field-circuit coupled method, the output voltage distortions of Dyn transformer and DOPSDT are calculated. Results show that since the 3rd, 5th and 7th load current harmonic fluxes are cancelled on the secondary side, the corresponding harmonic impedance of DOPSDT are lower, and the corresponding harmonic voltage distortions of DOPSDT are also greatly lower than the distortions of the Dyn transformer. [ABSTRACT FROM AUTHOR]