Fault Resilient Soft Switching DC-DC Converter for Modular Solid State Transformer Applications

Soft-switched isolated converters are preferred for dc-dc stage in solid state transformer applications, wherein fault resilience is highly desirable. This article presents a fault resilient, soft-switching dc-dc converter and associated integrated controller. The proposed integrated controller ensu...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on industry applications 2022-03, Vol.58 (2), p.2242-2254
Main Authors: Nachankar, Pratik, Suryawanshi, Hiralal M., Chaturvedi, Pradyumn, Atkar, Dipesh, Reddy P., Vijaya Vardhan
Format: Article
Language:English
Subjects:
Circuit faults
Control systems
Control systems design
Controllers
DC-DC power converters
Electronic devices
Fault resilience
Inductance
Reconfiguration
Rectifiers
Reliability
Resilience
Resonant frequency
series resonant dc–dc converter
Solid state
solid state transformer (SST)
Switches
Switching
Transformers
Voltage converters (DC to DC)
zero current transition (ZCT)
zero voltage transition (ZVT)
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Soft-switched isolated converters are preferred for dc-dc stage in solid state transformer applications, wherein fault resilience is highly desirable. This article presents a fault resilient, soft-switching dc-dc converter and associated integrated controller. The proposed integrated controller ensures smooth and reliable fault resilient operation with simplified reconfiguration of employed voltage restorer rectifier during fault. The integrated controller promotes converter design for operation above resonance to avail soft transition of all power devices, reduced EMI, and deployment of body diode integrated switches. Further, the reconfigurable multiplier-type rectifier increases overall converter gain without increased transformer turns ratio. The converter also favors minimized resonant inductance due to lower equivalent resistance and reduced transformer size resulting from above resonant operation. The converter characteristic curves during normal and fault states are presented. Experimental investigations for 1.25-kW prototype in both dynamic and steady state are presented to demonstrate fault resilient capabilities and performance efficacy. Also, impact of postfault reconfiguration on operation frequency, efficiency, and loss distribution is demonstrated.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2022.3142236