Search for: post-fault-control-strategy
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    Fault tolerant operation strategy design for modular multilevel converters

    , Article IECON Proceedings (Industrial Electronics Conference), 24 October 2016 through 27 October 2016 ; 2016 , Pages 2172-2176 ; 9781509034741 (ISBN) Haghnazari, S ; Vahedi, H ; Zolghadri, M. R ; Sharif University of Technology
    IEEE Computer Society  2016
    In this paper a new post fault operation strategy is proposed for modular multilevel converter (MMC). The conventional MMC fault tolerant operation methods use redundant cells in spinning or cold reserve schemes, however in this work the MMC fault tolerant operation is achieved without requiring any redundant cells. The introduced strategy modifies capacitors reference voltages and arms modulation reference waveforms in faulty leg of MMC while other legs operate normally. The applied technique leads to having some degree of overvoltage in faulty leg capacitors which could be neglected since the number of cells is high. Simple realization and significant economic savings would be attained as... 

    Fault-Tolerant Operation of Three-Phase Dual Active Bridge Converter Against Semiconductor Power Switches Fault

    , M.Sc. Thesis Sharif University of Technology Davoodi Moghadam, Amirali (Author) ; Zolghadri, Mohammad Reza (Supervisor)
    The three-phase Dual Active Bridge DC-DC converter, by virtue of its various advantages, has been widely used in numerous industrial and sensitive applications. However, this converter includes a large number of power switching devices, which are the most fragile components in Power Electronics, and therefore, can pose a threat to appropriateness of the converter for such applications. Accordingly, introducing a fault-tolerant scheme for this converter is necessary, in order to meet the demands of high reliability and service continuity in aforementioned applications. In this thesis, firstly, the converter is studied during normal operation as well as under switch open-circuit fault, and the...