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A Novel Seven Level Hybrid Fault Tolerant Converter
Journal
2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
Date Issued
2021-01-01
Author(s)
Shahane, Rajat
Belkhode, Satish
Shukla, Anshuman
Abstract
Multilevel converters are popular choice for high-power applications to achieve high-power density and efficiency. This paper presents a seven-level hybrid fault tolerant converter (HFTC), with two identical sub-modules. The proposed HFTC is comprised of a combination of Si/SiC devices, where Si IGBTs are operated at fundamental frequency, while SiC MOSFETs are switched at high switching frequency to achieve reduced losses. In addition to the reduction in converter losses, SiC MOSFETs in the HFTC provide a fault tolerant operation with fast isolation or bypass capability to have minimum effect on the converter operation. Furthermore, the HFTC can isolate ac and dc side faults without the need of external circuit in addition to providing the elimination of leakage current, making it a prominent choice for transformerless grid connected converter for PV systems. In this paper, analytical and simulation studies are presented with the experimental validation to demonstrate the converter features.
Subjects