Comparison of Fuzzy and FPGA Based Fault Tolerant Schemes for Four Switch Space Vector PWM Inverters


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Abstract


This paper presents a comparison of fuzzy logic controller (FLC) and FPGA based fault tolerant scheme for four switch voltage source inverter (VSI). The proposed fault tolerant VSI accommodates only four switches in two legs instead of six switches in three legs, two switches in auxiliary leg and two triac switches . The cost, electromagnetic interference (EMI) and switching losses are reduced due to absence of two switches in four switch inverter. In this paper fault tolerant control of the above two methods are designed to detect and isolate the fault which occurs in any one of the switches in the inverter. The merit of this system is to minimize the time between the fault occurrence and its isolation. In all methods, respective controllers generate necessary gate pulses for the power switches to drive three phase induction motor. In comparison, the modeling and simulation results show that the FPGA based scheme is found to be better dynamic characteristics, less switching losses and better fault recovery time of below 50ns
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Keywords


Fault Tolerant Control; Fuzzy Logic Controller (FLC); FPGA Controller; Four Switch Voltage Source Inverter (FSVSI); Space Vector Pulse Width Modulation (SVPWM)

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References


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