Space vector modulation strategy for VIENNA rectifier and load unbalanced ability

The space vector modulation strategy for the three-phase/wire/level VIENNA rectifier is analysed in this study. Furthermore, the voltage balancing ability of DC-link neutral point is demonstrated as well. The maximum unbalanced rate between the loads for dual-output under different modulation indices m is theoretically calculated when the converter works in unity power factor. A robust controller to balance the output voltage under the unbalanced load for different modulation indices is proposed. An experimental prototype was built to verify the theoretical analysis. The voltages for dual-output are balanced when the converter works as a power factor corrector, and therefore the theoretical analysis is verified. Finally, the series of tested maximum unbalanced rate between the loads for dual-output under different modulation indices m was given, which verifies the theoretical analysis.