Abstract
FAULT TOLERANT AND RECONFIGURATION OF MODULATION USING CASCADED H-BRIDGE CONVERTER
P. Iraianbu*, T. Santhosh, T. Soundararajan and P. Sakthivel
ABSTRACT
In this paper, according to the switching states the failure situations can be classified into two types as follows failure type I and failure type II(F1 and F2) of the multilevel inverters are discussed and the gate signals can be reconfigured according to the failure modes. The damaged power cell is bypassed and PWM pattern is adjusted such that the inverter is able to continue to produce a three-phase balanced line-to-line voltage. The reconfiguration method is discussed for discontinuous pulse width modulation (DPWM). This reconfiguration method can be extended for other carrier based method also. Balanced line-to-line voltage will be achieved with the proposed method when device failure occurs. Total harmonic distortion of DPWM is compared with normal operation.
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