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

2018-11-12T09:51:01+00:00septembre 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.

Analysis of the Lower Limit of Allowable Energy in Modular Multilevel Converters

2019-07-01T09:34:37+00:00septembre 21st, 2018|Architecture & systèmes du supergrid, Publications|

In this paper, a thorough analysis of the converter arm behavior is presented, which gives an analytic expression of the lower limit of the energy as a function of the converter operating point and the connected grid conditions. The relation between the lower energy limit and the operating power is analyzed by using the practical MMC specifications of an HVDC application. An experimental test of a small-scale MMC mock-up demonstrates the validity of the theoretical analysis.

Repetitive short-circuit measurement on SiC MOSFET

2018-11-12T09:51:03+00:00septembre 7th, 2018|Conference, Electronique de puissance & convertisseurs|

Robustness study for the 1.7 kV SiC MOSFET is presented. After evaluation of the critical energy required for failure, devices were submitted to repetitive short-circuits conditions.

Models of AC and DC cable systems for technical and economic evaluation of offshore wind farm connection

2019-01-10T10:06:54+00:00septembre 3rd, 2018|Appareillage électrique haute tension, Publications, Systèmes de câbles & jonctions HVDC|

Accurate cable modeling is a recurrent issue for electric architecture evaluation and design, especially in specific contexts, like offshore wind farms. This paper proposes optimal analytical cable models for the technical and economic assessment of offshore wind generation systems.