Fast fault identification in bipolar HVDC grids: a fault parameter estimation approach
The protection of meshed HVDC grids requires the fast identification of faults affecting the transmission lines.
Fast fault identification in bipolar HVDC grids: a fault parameter estimation approach
The protection of meshed HVDC grids requires the fast identification of faults affecting the transmission lines.
PhD Nicolas MANDULEY “Contribution to Insulation Coordination Studies for VSC-HVDC Systems”
A contribution to the development of high-scale HVDC systems, particularly regarding insulation coordination for Voltage Source Converter (VSC) based technologies.
PhD Nicolas MANDULEY “Contribution to Insulation Coordination Studies for VSC-HVDC Systems”
A contribution to the development of high-scale HVDC systems, particularly regarding insulation coordination for Voltage Source Converter (VSC) based technologies.
Webinar “Unlocking HVDC interoperability”: organisational and contractual aspects of developing multi-vendor HVDC projects
We discussed the organisational and contractual aspects of developing multi-vendor HVDC projects.
AC/DC Dynamic Interactions of MMC-HVDC in Grid-Forming for Wind-Farm Integration in AC Systems
This paper studies the dynamic interactions between the AC grids and the DC system. In this work, we focus on MMC-HVDC links interconnecting offshore wind farms and AC systems.
Assessment of protection strategy options for future DC grids
This paper proposes a set of measurable Key Performance Indicators (KPI) that demonstrates how effective a protection strategy is achieving key objectives.
Phd Ragavendran RAMACHANDRAN “Control and Power Management of an Offshore Wind Power Plant with a Diode Rectifier based HVDC Transmission”
Energy Transition for a more sustainable world is now the priority in societies. Towards this objective, especially in Europe, the offshore wind energy development has been relatively rapid. For Offshore Wind Power Plants (OWPP) farther from the shore (50 km and beyond) Voltage Source Converter (VSC) based High Voltage DC (HVDC) Transmission has become the prominent solution. Replacement of the offshore VSC station by multiple Diode Rectifier Units (DRUs) led to a cheaper, more compact and robust solution. This thesis focusses on various technological and scientific problems involved in the control system of the Offshore Wind power Plant with Diode Rectifier (DR) based HVDC transmission. These challenges are first reviewed in detail along with the state of the art. Then, based on the system dynamics, a grid forming control scheme is proposed by using the P-V and Q-f droop relationships, with a solution for the synchronization of the wind generators. Moreover, some of the selected control solutions in the literature for this topology are reviewed, compared and assessed by using time domain simulations of a study case. Following this, the different solutions for black start of the offshore AC system are analyzed from the available literature and they are compared using the relevant qualitative criteria. The various faults in the offshore system are then analyzed and the above designed grid forming control scheme is extended with Fault Ride through (FRT) capability, for offshore AC grid faults. Finally, a brief analysis is done on the challenges for the integration of this OWPP topology into a Multi Terminal DC (MTDC) network.
The renewables integration via HVDC grids
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...
