Phd Priscillia DANIEL « Electrical properties study of cross-linked polyethylene insulated cables in presence of gaseous cavities aged under DC or DC with harmonic voltages »

2019-07-26T09:39:56+02:00juillet 5th, 2019|Phd, Systèmes de câbles & jonctions HVDC|

This study aims to examine possible impact of these harmonics in presence of microcavities. Depending on their size and on the electrical field, partial discharges (PD) can occur in these microcavities. Two types of cables have been aged: a medium voltage AC (MVAC) cable with millimetric cavities induced artificially and a model cable with an HVDC XLPE grade.

PhD Loriane DESMARS « Study of electrical and thermal properties of epoxy-anhydride composite materials for high voltage insulation »

2019-07-26T09:40:22+02:00avril 2nd, 2019|Appareillage électrique haute tension, Phd, Systèmes de câbles & jonctions HVDC|

The work presented in this manuscript has been motivated by the necessity to develop more efficient electrical insulating materials compared to commercially available ones. An epoxy-anhydride matrix filled with micron sized alumina, often used to produce GIS solid insulators, has been used as a reference for this study.

Phd Caroline STACKLER « Electronic transformers for railway applications »

2019-07-26T09:40:23+02:00février 25th, 2019|Electronique de puissance & convertisseurs, Phd|

The main objective of this thesis is to develop a methodology to size PETT topologies, in order to compare them.

PhD Amjad MOUHAIDALI « Contribution to the modelling of HVDC cables for electromagnetic transient simulations »

2019-07-26T09:40:23+02:00février 13th, 2019|Architecture & systèmes du supergrid, Phd|

The integration of new technologies in the electric grids made them more and more complex, and most likely future growth of power grids will be based more on underground cables than overhead lines. One problem here, is that the mathematical model for electromagnetic simulation of power cables still has some shortcomings regarding stability, accuracy and passivity. In this thesis, we evaluate the cable parameters using analytical and numerical methods.

PhD Juan-Carlos GONZALEZ « Transient stability of high voltage AC-DC electric transmission systems »

2019-07-26T09:40:28+02:00février 11th, 2019|Architecture & systèmes du supergrid, Phd|

This thesis addresses the transient stability analysis of hybrid AC/DC electric transmission systems. More precisely two questions sought to be investigated: What is the impact of a DC contingency on AC transient stability? How can we take advantage of the DC transmission systems as control inputs in order to enhance AC transient stability?

PhD Quentin MOLIN « High Voltage SiC MOSFET Robustness study: threshold voltage shift and short-circuit behaviour »

2019-07-26T09:40:31+02:00décembre 17th, 2018|Electronique de puissance & convertisseurs, Phd|

This manuscript is a contribution to reliability and robustness study of MOSFET components on silicon carbide “SiC”, wide band gap semiconductor with better characteristics compared to silicon “Si” material. Those new power switches can provide better switching frequencies or voltage withstanding for example in power converter. SiC MOSFET are the results of approximately 10 years of research and development and can provide increased performances and weight to some converter topology for high voltage direct current networks.

PhD Miguel ROMERO RODRIGUEZ « Supervisory control synthesis for MMC-based HVDC systems »

2019-07-26T09:40:37+02:00novembre 9th, 2018|Architecture & systèmes du supergrid, Phd|

This work proposes a method for the full development, from conception to implementation, of the supervisory control of a multi-terminal HVDC (MT-HVDC) system.

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

2019-07-26T09:41:08+02:00septembre 25th, 2018|Appareillage électrique haute tension, Phd, Tout|

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 »

2019-07-26T09:41:48+02:00mai 29th, 2018|Appareillage électrique haute tension, 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 »

2019-07-26T09:42:13+02:00janvier 26th, 2018|Architecture & systèmes du supergrid, Phd|

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.