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

作者：Iman Eini Hossein^*; Farhangi Shahrokh; Schanen Jean Luc; Khakbazan Fard Mahboubeh

来源：Journal of Power Electronics, 2010, 10(1): 34-42.

DOI：10.6113/JPE.2010.10.1.034

• Cascaded H-bridge rectifier
• Fault diagnosis and protection
• Fault-tolerant design
• Redundancy and reliability

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.

• 出版日期2010-1