Subhadra Tiwari
Foto:
Kai T. Dragland / NTNU
About
Subhadra Tiwari (1983) is an Associate Professor in Electric Drives at the Department of Electric Energy at NTNU. Her research interests focus on the design, control, and system-level integration of power electronic converters and their applications in electrified energy systems.
She has industrial experience as a Technical Specialist in Power Electronics and Electric Drives. She worked at Wärtsilä Norway AS (2011–2015) with marine applications and at Rolls-Royce Electrical Norway AS (2019–2025) with aerospace applications.
Her technical expertise includes the design of LV and MV converters and gate-driver systems, DC grid protection, EMC-compliant design, and system integration, with awareness of relevant aerospace and marine standards including RTCA DO-160, MIL-STD-461, and IEEE-519. She has experience with both silicon and wide-bandgap semiconductor technologies (SiC and GaN), as well as control strategies for low- and high-speed electrical machines.
Her work provides insight into key differences in requirements across marine and aerospace drive systems, particularly related to safety, redundancy, modularity, control, protection, insulation coordination, and overall system design methodologies.
PhD students and Projects:
Erlend Redi Haga – PhD candidate, FME MarTrans: modular galvanically isolated DC/DC converters for marine applications
Publications
2019
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2019)
SiC MOSFETs an Diodes: Characterization, Applications and Low-Inductive Converter Design Considerations.
Norges teknisk-naturvitenskapelige universitet
Doctoral thesis
-
Tiwari, Subhadra;
Basu, Supratim;
Undeland, Tore Marvin;
Midtgård, Ole-Morten.
(2019)
Efficiency and Conducted EMI evaluation of a single-phase power factor correction boost converter using state-of-the-art SiC MOSFET and SiC diode.
IEEE transactions on industry applications
Academic article
-
Tiwari, Subhadra;
Langelid, John K.;
Undeland, Tore Marvin;
Midtgård, Ole-Morten.
(2019)
Merits of SiC MOSFETs for high-frequency soft-switched converters,measurement verifications by both electrial and calorimetric methods.
EPE Journal: European Power Electronics and Drives
Academic article
2018
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2018)
An insight into geometry and orientation of capacitors for high-speed power circuits.
Academic chapter
-
Tiwari, Subhadra;
Undeland, Tore Marvin;
Midtgård, Ole-Morten;
Nilsen, Roy.
(2018)
SiC MOSFETs for Offshore Wind Applications.
Journal of Physics: Conference Series (JPCS)
Academic article
-
Tiwari, Subhadra;
Abuishmais, Ibrahim Abed;
Langelid, John Kåre;
Lund, Richard;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2018)
Characterization of body diodes in the-state-of-the-art SiC FETs-Are they good enough as freewheeling diodes?.
Academic chapter
2017
-
Tiwari, Subhadra;
Langelid, John Kåre;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2017)
Soft switching loss measurements of a 1.2 kV SiC MOSFET module by both electrical and calorimetric methods for high frequency applications.
Academic chapter
-
Tiwari, Subhadra;
Langelid, John Kåre;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2017)
Hard and soft switching losses of a SiC MOSFET module under realistic topology and loading conditions.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin;
Lund, Richard.
(2017)
Parasitic capacitances and inductances hindering utilization of the fast switching potential of SiC power modules. Simulation model verified by experiment.
Academic chapter
2016
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
Design of low inductive busbar for fast switching SiC modules verified by 3D FEM calculations and laboratory measurements.
Academic chapter
-
Tiwari, Subhadra;
Rabiei, Ali;
Shrestha, Praveen;
Midtgård, Ole-Morten;
Undeland, Tore Marvin;
Lund, Richard;
Gytri, Anders.
(2016)
Design Considerations and Laboratory Testing of Power Circuits for Parallel Operation of Silicon Carbide MOSFETs.
Academic chapter
-
Torsæter, Bendik Nybakk;
Midtgård, Ole-Morten;
Lund, Richard;
Tiwari, Subhadra.
(2016)
Evaluation of Switching Characteristics, Switching Losses and Snubber Design for a Full SiC Half-Bridge Power Module.
Norges teknisk-naturvitenskapelige universitet
Master thesis
-
Torsæter, Bendik Nybakk;
Tiwari, Subhadra;
Lund, Richard;
Midtgård, Ole-Morten.
(2016)
Experimental Evaluation of Switching Characteristics, Switching Losses and Snubber Design for a Full SiC Half-Bridge Power Module.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin;
Lund, Richard.
(2016)
Experimental performance comparison of six-pack SiC MOSFET and Si IGBT modules paralleled in a half-bridge configuration for high temperature applications.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
SiC MOSFETs for future motor drive applications.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
Experimental performance evaluation of two commercially available, 1.2 kV half-bridge SiC MOSFET modules.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
Comparative evaluation of a commercially available 1.2 kV SiC MOSFET module and a 1.2 kV Si IGBT module.
Academic chapter
2012
-
Tiwari, Subhadra;
Undeland, Tore Marvin;
Basu, Supratim;
Robbins, William P..
(2012)
Silicon Carbide Power Transistors,Characterization for Smart Grid Applications.
Academic chapter
2011
-
Tiwari, Subhadra;
Abuishmais, Ibrahim;
Undeland, Tore Marvin;
Bøysen, Kjetil.
(2011)
Silicon Carbide Power Transistors for Photovoltaic Applications.
Academic chapter
Journal publications
-
Tiwari, Subhadra;
Undeland, Tore Marvin;
Midtgård, Ole-Morten;
Nilsen, Roy.
(2018)
SiC MOSFETs for Offshore Wind Applications.
Journal of Physics: Conference Series (JPCS)
Academic article
-
Tiwari, Subhadra;
Basu, Supratim;
Undeland, Tore Marvin;
Midtgård, Ole-Morten.
(2019)
Efficiency and Conducted EMI evaluation of a single-phase power factor correction boost converter using state-of-the-art SiC MOSFET and SiC diode.
IEEE transactions on industry applications
Academic article
-
Tiwari, Subhadra;
Langelid, John K.;
Undeland, Tore Marvin;
Midtgård, Ole-Morten.
(2019)
Merits of SiC MOSFETs for high-frequency soft-switched converters,measurement verifications by both electrial and calorimetric methods.
EPE Journal: European Power Electronics and Drives
Academic article
Part of book/report
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2018)
An insight into geometry and orientation of capacitors for high-speed power circuits.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
Design of low inductive busbar for fast switching SiC modules verified by 3D FEM calculations and laboratory measurements.
Academic chapter
-
Tiwari, Subhadra;
Rabiei, Ali;
Shrestha, Praveen;
Midtgård, Ole-Morten;
Undeland, Tore Marvin;
Lund, Richard;
Gytri, Anders.
(2016)
Design Considerations and Laboratory Testing of Power Circuits for Parallel Operation of Silicon Carbide MOSFETs.
Academic chapter
-
Tiwari, Subhadra;
Undeland, Tore Marvin;
Basu, Supratim;
Robbins, William P..
(2012)
Silicon Carbide Power Transistors,Characterization for Smart Grid Applications.
Academic chapter
-
Tiwari, Subhadra;
Abuishmais, Ibrahim;
Undeland, Tore Marvin;
Bøysen, Kjetil.
(2011)
Silicon Carbide Power Transistors for Photovoltaic Applications.
Academic chapter
-
Tiwari, Subhadra;
Abuishmais, Ibrahim Abed;
Langelid, John Kåre;
Lund, Richard;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2018)
Characterization of body diodes in the-state-of-the-art SiC FETs-Are they good enough as freewheeling diodes?.
Academic chapter
-
Torsæter, Bendik Nybakk;
Tiwari, Subhadra;
Lund, Richard;
Midtgård, Ole-Morten.
(2016)
Experimental Evaluation of Switching Characteristics, Switching Losses and Snubber Design for a Full SiC Half-Bridge Power Module.
Academic chapter
-
Tiwari, Subhadra;
Langelid, John Kåre;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2017)
Soft switching loss measurements of a 1.2 kV SiC MOSFET module by both electrical and calorimetric methods for high frequency applications.
Academic chapter
-
Tiwari, Subhadra;
Langelid, John Kåre;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2017)
Hard and soft switching losses of a SiC MOSFET module under realistic topology and loading conditions.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin;
Lund, Richard.
(2017)
Parasitic capacitances and inductances hindering utilization of the fast switching potential of SiC power modules. Simulation model verified by experiment.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin;
Lund, Richard.
(2016)
Experimental performance comparison of six-pack SiC MOSFET and Si IGBT modules paralleled in a half-bridge configuration for high temperature applications.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
SiC MOSFETs for future motor drive applications.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
Experimental performance evaluation of two commercially available, 1.2 kV half-bridge SiC MOSFET modules.
Academic chapter
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2016)
Comparative evaluation of a commercially available 1.2 kV SiC MOSFET module and a 1.2 kV Si IGBT module.
Academic chapter
Student thesis or dissertation
-
Tiwari, Subhadra;
Midtgård, Ole-Morten;
Undeland, Tore Marvin.
(2019)
SiC MOSFETs an Diodes: Characterization, Applications and Low-Inductive Converter Design Considerations.
Norges teknisk-naturvitenskapelige universitet
Doctoral thesis
-
Torsæter, Bendik Nybakk;
Midtgård, Ole-Morten;
Lund, Richard;
Tiwari, Subhadra.
(2016)
Evaluation of Switching Characteristics, Switching Losses and Snubber Design for a Full SiC Half-Bridge Power Module.
Norges teknisk-naturvitenskapelige universitet
Master thesis
Teaching
Courses
Outreach
2016
-
LectureUndeland, Tore Marvin; Tiwari, Subhadra; Spro, Ole Christian; Midtgård, Ole-Morten. (2016) Nye halvledere av silisiumkarbid, SiC. Generalforsamling Trondhjems Polytekniske Forening
-
LectureTiwari, Subhadra. (2016) Application of SiC devices in Power Electronics. Seminar on Emerging Power Semiconductor Devices
-
LectureTiwari, Subhadra; Spro, Ole Christian. (2016) Overview of Wide Bandgap Devices for Power Electronics. Seminar on Emerging Power Semiconductor Devices