Static and Switching Characteristics of 10 kV-class SiC BJTs and Darlingtons

2019-09-30T11:48:18+02:00September 30th, 2019|Power Electronics & Converters, Publications|

This paper reports the device design, fabrication and characterisation of 10 kV-class BJT. Manufactured devices have been packaged in single BJT, two paralleled BJTs and Darlington. The static and switching characteristics of the resulting devices have been measured. The BJTs (2.4mm² active area) show a specific on-resistance as low as 198 mΩ·cm² at 100 A/cm² and room temperature for a βMax of 9.6, whereas the same active area Darlington beats the unipolar limit with a specific on-resistance of 102 mΩ·cm² at 200 A/cm² (β=11) for a βMax of 69. Double pulse tests reveal state of the art switching with very sharp dV/dt and di/dt. Turn-on is operated at less than 100 ns for an EON lower than 4mJ, whereas the turn-off takes longer times due to tail current resulting in EOFF of 17.2 mJ and 50 mJ for the single BJT and Darlington respectively when operated at high current density. Excellent parallelisation have been achieved.

The EPE flag handover at EPE’19, Genova: SuperGrid Institute takes the reins for EPE 2020 ECCE Europe in Lyon, France

2019-09-09T14:16:14+02:00September 6th, 2019|Conference, Power Electronics & Converters, Supergrid Architecture & Systems|

At the closing session, Abdelkrim Benchaib, General Chairman of EPE’20, received the EPE flag, on stage, from Mario Marchesoni, General Chairman of EPE’19, in the presence of Leo Lorenz, President of the EPE association. During this conference, Abdelkrim Benchaib was also elected as a member of the executive committee of EPE ECCE Europe for 4 more years.

Power Hardware In-the-Loop validation of DC-DC power converter for offshore wind energy

2019-09-02T15:12:38+02:00September 2nd, 2019|Power Electronics & Converters, Publications|

he paper describes the development of a power converter small scale mock-up and a real time model of an off-shore wind farm. A Power Hardware In-the-Loop validation is proposed for a demonstration of grid architecture and control principles. The paper presents the design methodology of the PHIL test bench and underlines the contribution of PHIL in the design flow of power converter development for DC grid application. Experimental results of preliminary PHIL tests are presented.

Influence of the operating frequency on DC-DC converters for HVDC grids

2019-09-02T15:10:02+02:00September 2nd, 2019|Power Electronics & Converters, Publications|

This paper proposes an analytical methodology that allows to assess rapidly the comparison of DC-DC converters. It was applied to evaluate two modular DC-DC structures, one isolated circuit and one non isolated circuit, focusing in the variation of the operating frequency for different DC voltage transformation ratios.

SuperGrid Institute PhD student awarded Fulbright scholarship to work at Virginia Tech

2019-08-08T09:56:58+02:00August 8th, 2019|Power Electronics & Converters|

SuperGrid Institute is going global! Next week, Arthur Boutry will be crossing the Atlantic to collaborate with the Center for Power Electronics Systems (CPES), a laboratory at Virginia Tech (listed by The Times as one of the top 300 universities in the world in 2019!). During his time in the USA, Arthur will continue his work on designing MMC sub-modules for HVDC applications as part of his PhD which he began in 2018 at SuperGrid Institute, in collaboration with the Laboratoire Ampère. Arthur received a grant from the American government for his exchange year in the form of a Fulbright scholarship, one of the most prestigious and competitive fellowship programs in the world. An impressive accomplishment!

Study of convective condensation in a thermosiphon loop

2020-01-16T14:10:10+01:00July 24th, 2019|Power Electronics & Converters, Publications|

In this article, we focus on the condenser of a loop thermosiphon designed to cool power electronic component. The objective here is to condense Novec 649, our chosen working fluid for this loop. It is a fluid recently developed by 3M, which is known for having low environmental impact and non-flammable. We first present a theoretical analysis with the calculation and the hypotheses leading to the design of the multi-tubular condenser. Then we present a full size thermosiphon built for experimental validation. A discussion then addresses some of the design hypotheses. Three main parameters are studied : the tilting angle of the condenser (from horizontal to vertical orientations), the temperature of the coolant and finally the mass flow effect at different saturation temperatures. In our setup, we dissipate up to 2.4 kW at the evaporator level. The produced vapor is then condensed in the heat exchanger using cold water flowing at countercurrent. A number of measurements are made via thermocouples and pressure sensors located at both ends of the condenser to measure the average heat exchange coefficient.

Michel MERMET-GUYENNET’s keynote speech at PEDS 2019

2019-07-12T14:49:20+02:00July 12th, 2019|Conference, Power Electronics & Converters|

This Tuesday the 10th of July, Michel MERMET-GUYENNET presented a keynote speech at the 13th IEEE International Conference on Power Electronics and Drive Systems (PEDS 2019) in Toulouse, following the invitation of Bernado COGO from the Antoine de Saint Exupéry Institute of Technology (IRT Saint Exupéry). In his paper, Michel MERMET-GUYENNET presented power electronics technologies for MV and HV grids.

Case Study of Non-Isolated MMC DC-DC Converter in HVDC Grids

2019-09-02T14:37:59+02:00June 7th, 2019|Power Electronics & Converters, Publications|

This article presents the topology for non-isolated MMC-based DC-DC converter. The initial design study illustrates that such DC/DC converter will have overall semiconductor count comparable to a MMC AC-DC (used with HVDC transmission) converter of similar rating. A full controller schematic is presented and operating principles are discussed.

SuperGrid Institute at PCIM Europe 2019

2019-06-03T18:06:30+02:00May 13th, 2019|Event, Power Electronics & Converters|

This year, for the first time our presence at PCIM Europe 2019, was noticeable with our stand from 6th to 9th May. At the conference, and as power electronics is at the heart of our innovations, SuperGrid Institute was invited to present during the « Smart Transformers » special session.