Journal
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
Volume 56, Issue 5, Pages 5499-5510Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIA.2020.2997306
Keywords
Inverters; Switches; Circuit faults; Insulated gate bipolar transistors; Voltage control; Legged locomotion; Medium voltage; Cascaded H-bridge multilevel inverter (CHB-MLI); failure in semiconductor switches; postfault control
Funding
- Natural Sciences and Engineering Research Council Canada
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In this article, a new postfault control algorithm for cascaded H-bridge (CHB) multilevel inverter is proposed to increase the maximum available output voltage under semiconductor fault conditions. Once a semiconductor switch in an H-bridge power cell fails, instead of bypassing the faulty cell, it can be utilized to generate a voltage. However, one of the three levels (positive, negative, or zero) of the faulty cell output voltage is not available, reducing the available output voltage of the cell to half. In the proposed method, the faulty cells being utilized and combined with the neutral shift (NS) method to achieve a higher output voltage of the CHB in faulty conditions. The output voltage obtained by the proposed method is analyzed for different faulty conditions and compared with the conventional NS method. Experimental results are presented confirming the effectiveness of the proposed methods in increasing the maximum output voltage at different faulty conditions.
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