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An improved parallel five-level reinjection CSC for self-commutation of thyristor converter

Yumei Song (School of Mechanical, Electrical and Information Engineering, Shandong University (Weinhai), Weihai, China)
Jianzhang Hao (School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China)
Changhao Dong (School of Mechanical, Electrical and Information Engineering, Shandong University (Weinhai), Weihai, China)
Xizheng Guo (School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China)
Li Wang (School of Mechanical, Electrical and Information Engineering, Shandong University (Weinhai), Weihai, China)

Microelectronics International

ISSN: 1356-5362

Article publication date: 29 July 2022

17

Abstract

Purpose

This paper aims to study a multi-level reinjection current source converter (MLR-CSC) that adds attracting properties such as the self-commutation and pulse multiplication to the thyristor converter, which is of great significance for increasing the device capacity and reducing current harmonics on the grid side. Particularly, designing advantageous driving methods of the reinjection circuit is a critical issue that impacts the harmonic reduction and operation reliability of the MLR-CSC.

Design/methodology/approach

To deal with the mentioned issue, this paper takes the five-level reinjection current source converter (FLR-CSC), which is a type of the MLR-CSC, as the research object. Then, a method that can fully use combinations of five-level reinjection switching functions based on the concept of decomposition and recombination is proposed. It is worthy to mention that the proposed method can be easily extended to other multi-level reinjection circuits. Moreover, the working principle of the three-phase bridge circuit based on semi-controlled thyristors in the FLR-CSC that can achieve the four-quadrant power conversion is analyzed in detail.

Findings

Finally, the simulation and experimental results of FLR-CSC verify the effectiveness of the proposed reinjection circuit driving method and the operating principle of four-quadrant power conversion in this paper.

Originality/value

The outstanding features of the proposed driving method for FLR-CSC in this paper include combinations of reinjection switching functions that are fully exploited through three simple steps and can be conveniently extended to other multi-level reinjection circuits.

Keywords

Acknowledgements

Natural Science Foundation of Shandong Province.No. ZR2020ME119.The Key Research and Development Plan of Shandong Province.No. 2021CXGC010309.The National Key Research and Development Program of China.No. 2021CXGC010309.

Citation

Song, Y., Hao, J., Dong, C., Guo, X. and Wang, L. (2022), "An improved parallel five-level reinjection CSC for self-commutation of thyristor converter", Microelectronics International, Vol. ahead-of-print No. ahead-of-print. https://doi.org/10.1108/MI-05-2022-0093

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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