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A Unidirectional Insulated AC-DC Converter Based on the Hexverter and Multipulse-Rectifier

Lambert, Gustavo; Costabeber, Alessandro; Wheeler, Patrick; De Novaes, Yales Romulo


Gustavo Lambert

Alessandro Costabeber

Yales Romulo De Novaes


This paper proposes an insulated two-stage ac-dc converter to be applied in unidirectional power flow systems. The two-stage structure is the combination of a Hexverter and a series-type 12 pulse rectifier. The key features of the proposed structure are inherited from the modular multilevel converter concept such as modularity, scalability, and expandability. Besides the topology, this article presents a complete control strategy based on the output (dc) voltage regulation and Hexverter's stored energy. In particular, an unusual method to regulate the Hexverter's branch energy unbalances is proposed. All currents in the Hexverter are controlled which increases the robustness for operation in harsh environments such as subsea systems. Mathematical analysis of the control loops is carried out to develop the necessary control-oriented models for each control loop. The converter and the control strategy are verified through experiments in a a 24 cells Hexverter and a current-fed series-type 12-pulse rectifier.


Lambert, G., Costabeber, A., Wheeler, P., & De Novaes, Y. R. (2020). A Unidirectional Insulated AC-DC Converter Based on the Hexverter and Multipulse-Rectifier. IEEE Transactions on Power Electronics, 35(3), 2363-2371.

Journal Article Type Article
Acceptance Date Jul 8, 2019
Online Publication Date Jul 18, 2019
Publication Date Mar 1, 2020
Deposit Date Aug 13, 2019
Publicly Available Date Aug 15, 2019
Journal IEEE Transactions on Power Electronics
Print ISSN 0885-8993
Electronic ISSN 1941-0107
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 35
Issue 3
Pages 2363-2371
Keywords Electrical and Electronic Engineering
Public URL
Publisher URL
Additional Information © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.


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