Two methods to control neutral-point voltage fluctuation for a hybrid VIENNA rectifier

The Journal of Engineering

You-Yun Wang¹  Wei-Zhang Song²  Zhi-Hao Dai³  Wheeler Pat⁴  Nan Xie⁵ 

[1] School of Automation and Information Engineering, Xi'State Key Laboratory of Large Electric Drive System and Equipment Technology , Tianshui, Gansu , People'an University of Technology , Xi'an, Shaanxi , People's Republic of China

关键词: single-switch three-phase boost rectifier;    mathematical model;    neutral-point balance control methods;    neutral-point voltage fluctuation control;    parallel system;    VIENNA-type three level rectifier;    hybrid VIENNA rectifier;    zero-sequence component injection;    hybrid rectifier system;    DC-link capacitors;   

DOI  :  10.1049/joe.2018.0030

学科分类：工程和技术（综合）

来源: IET

【 摘 要 】

This study presents two neutral-point balance control methods for a hybrid VIENNA rectifier, which is composed of a parallel system of a single-switch three-phase Boost rectifier and a VIENNA rectifier. Each rectifier in this topology processes part of the output power, therefore, a highly efficient and reliable performance is achieved in this rectifier system. However, the unbalance voltage of two DC-link capacitors in the VIENNA-type three level rectifier is also reflected in this hybrid rectifier. The fluctuation reason in neutral-point has been analysed using a mathematical model, meanwhile, the two methods with a hybrid algorithm and a simplified method based on zero-sequence component injection are proposed to control neutral-point fluctuation in this hybrid rectifier system. Furthermore, the performance comparison between these two methods is provided. The effectiveness of the two control methods has been verified using experimental results.

【 授权许可】

CC BY