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Home > Thèses et HDR > Thèses en 2019

18/10/2019 - Guilherme DANTAS DE FREITAS

by Laurent Krähenbühl - published on , updated on

Mr Guilherme Dantas de Freitas defends his PhD on Oct. 18, 2019 at 2:00 PM.
Place : SuperGrid Institute, 23 rue Cyprian, Villeurbanne.

Titre :
Development of a methodology for DC grid protection strategies comparison

Jury :
Rapporteurs :
- M. Marc PETIT, Professeur à l’École Centrale Supélec
- M. Abdessamad KOBI, Professeur à l’Université d’Angers
Membres :
- M. Bertrand RAISON, Professeur à l’Université Grenoble Alpes, Directeur de thèse
- M. Eric NIEL, Professeur à l’INSA Lyon, Co-directeur
- M. Alberto BERTINATO, Ingénieur de recherche à SuperGrid Institute, Encadrant
- M. Nicolae BRINZEI, Maître de Conférences à l’Université de Lorraine
Invité :
- M. Olivier DESPOUYS, Ingénieur Docteur à RTE

Abstract :
One of the remaining challenges towards the safe and reliable operation of Multi-terminal high voltage Direct Current (MTDC) grids is their protection. Several proposals on how to perform the fault clearing and grid restoration in an MTDC grid have been made in the last decades. The proposals found in literature are diverse, they cover a wide range of possible options for protection philosophy, components required and other aspects that can greatly impact the performance and cost of the protection. Given the numerous possibilities to protect an MTDC grid, a methodology to evaluate and compare the best options is of utmost importance. The main objective of this thesis is to propose a comparison methodology that helps in the decision of the best protection strategy for an MTDC grid. The proposed methodology relies on two criteria to compare de strategies: performance and risk. Key Performance Indicators (KPIs) are defined to measure the performance of the protection strategy. The risk calculated for a protection strategy is found using all failure modes identified for the strategy. The Failure Mode and Effect Analysis (FMEA) is used in the risk assessment of the strategies. Once the performance and risk of strategies are available, their score is calculated. The score is a metric proposed in this thesis to rank the strategies. Three different protection strategies, implemented in a hybrid AC/DC grid have been chosen to illustrate the comparison methodology.

Keywords : HVDC grids, KPI, protection, risk, performance, failure modes