The large-scale integration of renewable electricity generation poses both structural, economic and management challenges. Among the major challenges, one can note the grid integration and the routing of this energy from the production units to the consumption poles. Major issues have to be faced like insufficient transmission capability, inertia reduction, stability margins mitigation. The HVDC is not a new idea but it can provide some interesting answers to these challenges. The keynote will list the locks and how they can be addressed by the HVDC grid. Finally, the underlying scientific issues will be discussed.
Phd Guilherme DANTAS DE FREITAS “Development of a methodology for DC grid protection strategies comparison”
High Voltage Direct Current (HVDC) grids are considered a promising solution for problems faced by nowadays power system such as: lines congestion, integration of large amounts of renewable power and enhancement of AC system stability. Among the challenges in the deployment of a HVDC meshed grid, the protection of these grids is regarded as one of the most critical. The protection of HVDC grid is challenging not only because the swift transients and fault currents without zero-crossing, but also due to the impact a DC faults can have on the AC system. Several propositions for HVDC grids protection strategies can be found in literature...
Every year the French chapter of IEEE Power & Energy Society (PES), in collaboration with SEE (Society of Electricity, Electronics and Information and Communication Technologies), recognises outstanding PhD theses and hands out the “outstanding engineer of the year” prize at an annual evening ceremony. This Wednesday the 9th of October, Ahmed Zama was honoured with the IEEE “Doctorate Award” for his thesis work on “Modeling and Control of Modular Multilevel Converters (MMCs) for HVDC applications”.
Use of Unbalanced Insulation for the Limitation of Double-Pole Lightning Flashovers in Double Circuit HVDC Overhead Lines
Lightning studies are a critical part of any system involving overhead lines. As HVDC technologies develop, new problems and questions arise regarding the lightning performance of HVDC overhead lines. For instance, the installation of two separate HVDC circuits on the same transmission tower may become a popular alternative for the uprating of old AC lines to take advantage of the already existing Right-of-Ways. Double-pole flashovers may be particularly constraining in double circuit HVDC systems, since they could lead to the loss of both circuits at the same time due to the flashover of both poles of the same polarity having the same amplitude at all times (which is not the most likely case in AC systems). This corresponds to a 100% of loss of transmitted power, which could represent a threat for the system stability. This constitutes the main motivation for this work.
The EPE flag handover at EPE’19, Genova: SuperGrid Institute takes the reins for EPE 2020 ECCE Europe in Lyon, France
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.
This paper proposes a new approach to tuning voltage droop parameters in an MMC-based multi-terminal HVDC system. Using the new degree of freedom offered by the virtual capacitor control, the transient behavior of the DC voltage can be improved without adverse effects on the connected AC grids.
Modeling Modular Multilevel Converters requires a special attention due to the strong associations between the accuracy and the complexity of models on one hand and the accuracy and simulation speed on the other hand. This paper investigates different implementation techniques for MMC models and gives an overview about their development and rapidity.
An experimental study of breakdown and pre-breakdown phenomena in liquid nitrogen (LN2) is performed in this paper, in order to provide useful knowledge for the design of high voltage superconducting systems.
Effect of the Surge Arrester Configuration in MMC-HVDC Systems under DC and Converter Fault Conditions
Different surge arrester configurations are studied for a modular multilevel converter (MMC) in a symmetrical monopole configuration. Each configuration is analyzed under fault conditions including DC side faults and faults inside the converter station. The configurations considered are compared in terms of overvoltages, current levels and energy dissipation.
SuperGrid Institute is proud to have been an active participant in the PROMOTioN project since 2016. This project is part of the European Union’s Horizon 2020 program and is made up of several work packages (WP) that share a common aim: developing meshed HVDC offshore grids that are both cost effective and reliable, through technological innovation. SuperGrid Institute is an active member of several Work Packages, including WP9 whose objective is to develop fault clearing strategies using Hardware-in-the-Loop (HIL) real-time simulation (RTS).