A Fault-Tolerant Control Strategy for Cascaded H-Bridge Multilevel Rectifiers

Hossein Iman-Eini; Shahrokh Farhangi; Jean-Luc Schanen; Mahboubeh Khakbazan-Fard

A Fault-Tolerant Control Strategy for Cascaded H-Bridge Multilevel Rectifiers

Hossein Iman-Eini

Shahrokh Farhangi

Jean-Luc Schanen

Mahboubeh Khakbazan-Fard

Vol. 10, No. 1, pp. 34-42, Dec. 2009

10.6113/JPE.2010.10.1.34

Cascaded H-bridge rectifier

Fault diagnosis and protection

Fault-tolerant design

Redundancy and reliability

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Abstract

Reliability is an important issue in cascaded H-bridge converters (CHB converters) because they use a high number of power semiconductors. A faulty power cell in a CHB converter can potentially lead to expensive downtime and great losses on the consumer side. With a fault-tolerant control strategy, operation can continue with the undamaged cells; thus increasing the reliability of the system. In this paper, the operating principles and the control method for a CHB multilevel rectifier are introduced. The influence of various faults on the CHB converter is investigated. The method of fault diagnosis and the bypassing of failed cells are explained. A fault-tolerant protection strategy is proposed to achieve redundancy in the CHB rectifier. The redundant H-bridge concept helps to deal with device failures and to increase system reliability. Simulation results verify the performance of the proposed strategy.

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Cite this article

[IEEE Style]

H. Iman-Eini, S. Farhangi, J. Schanen, M. Khakbazan-Fard, "A Fault-Tolerant Control Strategy for Cascaded H-Bridge Multilevel Rectifiers," Journal of Power Electronics, vol. 10, no. 1, pp. 34-42, 2010. DOI: 10.6113/JPE.2010.10.1.34.

[ACM Style]

Hossein Iman-Eini, Shahrokh Farhangi, Jean-Luc Schanen, and Mahboubeh Khakbazan-Fard. 2010. A Fault-Tolerant Control Strategy for Cascaded H-Bridge Multilevel Rectifiers. Journal of Power Electronics, 10, 1, (2010), 34-42. DOI: 10.6113/JPE.2010.10.1.34.