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Offset voltage injection method for neutral-point AC voltage ripple suppression in Vienna rectifiers

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Abstract

This paper proposes an offset voltage injection method to compensate for AC voltage ripple at the neutral-point of a Vienna rectifier. The proposed method leads to sinusoidal input currents and has a suppression effect on the AC voltage ripple at the neutral-point by injecting three offset voltages to remove both the zero current distortion and voltage unbalance (both DC voltage and AC voltage ripple) at the neutral-point. This can result in an improvement in the Total Harmonic Distortion (THD) of the input current. The offset voltage to realize the suppressing of the AC voltage ripple is defined based on a neutral-point voltage equivalence model of a Vienna rectifier. The priority of the offset voltages is considered to avoid over-modulation. In addition, incompatibility between offset voltages is analyzed to guarantee sinusoidal input currents. By considering both of these characteristics, the proposed method injects the offset voltages in order from the higher priority to the lower priority. The performance and effectiveness of the proposed method are verified with simulation and experimental results.

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Acknowledgements

This work is supported by the Korea Agency for Infrastructure Technology Advancement (KAIA) grant funded by the Ministry of Land, Infrastructure and Transport (grant: 21RTRP-B146050-04), and the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (No. 2022R1F1A1074316).

Funding

This study was funded by Korea Agency for Infrastructure Technology Advancement, 21RTRP-B146050-04, June-Seok Lee, National Research Foundation of Korea, 2022R1F1A1074316, June-Seok Lee.

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  1. Department of Electrical Engineering, Dankook University, Yongin, Korea

    Young-Min Go & June-Seok Lee

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  1. Young-Min Go
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Correspondence to June-Seok Lee.

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Go, YM., Lee, JS. Offset voltage injection method for neutral-point AC voltage ripple suppression in Vienna rectifiers. J. Power Electron. 23, 1400–1410 (2023). https://doi.org/10.1007/s43236-023-00657-5

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