The application of sliding mode observers to fault detection and isolation for multilevel converters

Shao, Shuai (2015) The application of sliding mode observers to fault detection and isolation for multilevel converters. PhD thesis, University of Nottingham.

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Multilevel converters have received significant interest recently as a result of their high power capability and good power quality. However due to the large number of sensitive components including power semiconductor devices and capacitors used in such circuits there is a high likelihood of component failures.

This thesis considers one of the most promising multilevel topologies---the modular multilevel converter (MMC). Several methods are presented to detect and locate open-circuit faults in the power semiconductor devices in an MMC. These methods are based on sliding mode observers (SMOs). The signals used in the proposed methods are already available as measurement inputs to the control system and no additional measurement elements are required. An experimental MMC rig has been designed and built to validate these fault detection and isolation methods. The methods can be used with other multilevel converter topologies employing similar analysis and principles.

Item Type: Thesis (University of Nottingham only) (PhD)
Supervisors: Wheeler, P.W.
Clare, J.C.
Watson, A.J.
Keywords: Multilevel converter, Fault detection and isolation, Sliding mode observer
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK7800 Electronics
Faculties/Schools: UK Campuses > Faculty of Engineering > Department of Electrical and Electronic Engineering
Item ID: 29098
Depositing User: Shao, Shuai
Date Deposited: 11 Sep 2015 09:43
Last Modified: 16 Dec 2017 22:27

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