PhD Etienne OUSS “Characterization of Partial Discharges and Defect Identification in High-Voltage Direct Current GIS”

2018-10-08T14:41:48+00:00September 25th, 2018|All, High Voltage Substation Equipment, Phd|

This thesis aimed to characterize partial discharges in DC gas-insulated substations, and to develop an automatic defect identification tool. The first step of this work was the development of a partial discharge measuring bench. The complete study has been performed in a GIS section, so that the results can be directly applied to industrial equipment.

PhD Benoît TEZENAS du MONTCEL “Experimental study and modelling of a metal vapor plasma in a vacuum chamber for the development of High-Voltage Circuit Breakers”

2018-10-08T14:41:56+00:00May 29th, 2018|High Voltage Substation Equipment, Phd|

The study involves first the building of an experimental setup where arcs, created between two fixed CuCr25 contacts, were visualized using a high-speed camera in a vacuum demountable chamber.

PhD William LEON GARCIA “Protection strategy for HVDC networks”

2018-10-08T14:42:46+00:00January 26th, 2018|Phd, Supergrid Architecture & Systems|

Multi-terminal high voltage direct current (MTDC) grids, or supergrids, are considered an interesting solution to integrate large amounts of renewable power and release congestion of existing AC power grids. Nonetheless, safe and reliable operation of such grids require the development of new DC protection systems.

PhD Kosei SHINODA “Control and Energy Management of MMC-based Multi-Terminal HVDC Grids”

2018-10-08T14:42:55+00:00January 2nd, 2018|Phd, Supergrid Architecture & Systems|

The scope of this thesis includes control and management of the Modular Multilevel Converter (MMC)-based Multi-Terminal Direct Current (MTDC).

PhD Swann GASNIER “Decision support framework for offshore wind farm electrical networks: Robust design and assessment under uncertainties’’

2018-10-08T14:43:04+00:00January 2nd, 2018|Phd, Supergrid Architecture & Systems|

Large offshore wind farms will be important players within the future energy landscape. What is the expected benefit for a project is an essential issue from Investor side, considering both technical and economic aspects. Levelized Cost Of Energy - LCOE - is a standard economic indicator which allows to assess the economic viability of a project.

PhD Justine BILLORE “Thermal aging of XLPE for HVDC cables”

2018-10-08T14:43:46+00:00July 21st, 2017|HVDC Cable Systems, Phd|

To connect the different points of the network, the transmission and distribution of electric power used cables. Since few years, cables and especially their insulation part are evolving, going from paper insulation to a synthetic insulation. Nowadays, the insulation part of HVDC cables is in crosslinked polyethylene or XLPE.

PhD Ilyas DCHAR “Design of a “fail-to-short” power module for HVDC applications”

2018-10-08T14:44:27+00:00July 3rd, 2017|Phd, Power Electronics & Converters|

High Voltage Direct Current (HVDC) converters are composed of hundreds of semiconductor switches connected in series to sustain the rated voltage of the converter (several hundred of kilovolts). Because of the large number of switches, it is highly probable that at least one of them will fail during the lifetime of the converter. Such failure should not cause the entire converter to shut down, despite the series connexion of the switches. As a consequence, each switch should be designed so that upon failure, it becomes a short circuit and keeps carrying the current (“fail-to-short” behaviour).

PhD Albert PEREIRA “Design methodology of a medium frequency transformer for high voltage and high power DC-DC converters”

2018-10-08T14:44:37+00:00July 3rd, 2017|Phd, Power Electronics & Converters|

The transmission and distribution of electric power is normally made by ac networks (50 Hz or 60 Hz), where one of the key elements of this infrastructure is the power transformer; used for more than a century, its design is very well understood, with a level of operating efficiency normally greater than 99%.

PhD Houssem Eddine NECHMI “Research of gas/ gas mixture without sulfur hexafluoride for High Voltage Insulation applications”

2018-10-08T14:44:52+00:00January 31st, 2017|High Voltage Substation Equipment, Phd|

SULPHUR hexafluoride, SF6, is the most common compressed gas used in high voltage power equipment since the 1950s and in HV transmissions and substations applications (GIS, GCB, GIL …), SF6 holds a prominent place because of its dielectric and chemical performance (high dielectric strength, non-toxicity, low condensation temperature, thermal stability, non-flammability, chemical inactivity with the other constituent materials of the apparatus, availability and moderate cost). It is one of the best insulators gas known today.