FAULT-TREE ANALYSIS OF CASCADED H-BRIDGE INVERTER ACCORDING TO VARIOUS SWITCHING SCHEMES
Journal Title: International Journal of Electrical and Electronics Engineering Research (IJEEER) - Year 2017, Vol 7, Issue 1
Abstract
Cascaded H-bridge multilevel inverter increases the number of output voltage levels by connecting H-bridge cells in series. More H-bridge cells ensure high qualified output voltage waves similar to sinusoidal wave and increase redundancy in the viewpoint of safety. However, the increase of the number of H-bridge cells grows up the possibility of failure of the system due to the increased circuit components and complex control signals. Cascaded H-bridge multilevel inverter can apply various pulse width modulated switching scheme to obtain a sinusoidal output voltage wave and to compensate the lack of H-bridge cells. For various PWM switching methods suitable to cascaded H-bridge multilevel inverter, each Fault-tree is given to analyze the reliability and failure rate. After FTA, the switching scheme is verified by simulation and experiments.
Authors and Affiliations
FEEL-SOON KANG
Keywords
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