Patent ID: 9231406
Filing Date: 2016-01-05
CPC Classification: H02J,H02P,Y02E

Claim Text:
1. A total harmonic distortion compensation control method, used in a three-phase switch-mode rectifier module, wherein the three-phase switch-mode rectifier module is coupled to a three-phase electrical grid for converting an AC voltage input on the three-phase electrical grid into a DC voltage, and the total harmonic distortion compensation control method comprises: performing harmonic detection on a grid-side phase current flowing into the three-phase switch-mode rectifier module; stopping adjusting a reactive component reference value of the grid-side phase current when a harmonic component of the grid-side phase current does not reach a predetermined harmonic value, so as to form a final reactive component reference value, or further determining a phase angle difference between a fundamental component of a rectifier AC-side phase current and a fundamental component of a rectifier AC-side phase voltage of the three-phase switch-mode rectifier module when a harmonic component of the grid-side phase current exceeds the predetermined harmonic value; stopping adjusting the reactive component reference value when the phase angle difference is a predetermined phase angle difference value, or further determining a power factor of the three-phase switch-mode rectifier module when the phase angle difference is not a predetermined phase angle difference value; and stopping adjusting the reactive component reference value when the power factor does not reach a predetermined power factor value, or adjusting the reactive component reference value when the power factor exceeds the predetermined power factor value, so as to change the final reactive component reference value; comparing a reactive component of the grid-side phase current with the final reactive component reference value; and adjusting the three-phase switch-mode rectifier module according to the comparison result above, until the reactive component of the grid-side phase current approaches the final reactive component reference value.