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Power converters

5. Output voltage of three-phase inverters

5.3. Square-wave control

Maximum of the 1st harmonic

  • U_{A0}(1): \frac{2U_{dc}}{\pi} = \frac{2∙400}{3,1416} = 255 V ,
    • i.e. rms value of the 1st harmonic:  180 V,
    • rms value of the square-wave voltage U_{A0} : 200 V
  • U_{zA}(1): \frac{2U_{dc}}{\pi} = \frac{2∙400}{3,1416} = 255 V ,
    • i.e. rms value of the 1st harmonic:  180 V,
    • rms value of the square-wave voltage U_{zA} : 189 V
  • U_{AB}(1): \frac{2U_{dc}}{\pi}\sqrt{3} = \frac{2∙400}{3,1416}\sqrt{3} = 441 V
    • i.e. rms value of the 1st harmonic:  312 V,
    • rms value of the square-wave voltage U_{AB} : 326 V