Multi-terminal VSC HVDC Operation, Control and AC System Integration
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
As a consequence of the European Union Renewable Energy Directive, the UK
is committed to a target of more than 30% of electricity to be generated from
renewable sources by 2020. The transmission reinforcements necessary to allow
the EU 2020 renewable target and longer-term energy goals to be achieved in
an effective and efficient manner were studied by the Electricity Networks
Strategy Group (ENSG) and detailed in their report Our Electricity Transmission
Network: A vision for 2020.
It was recognised in the report that due to planning
constraints and environmental concerns, traditional methods of enhancing
system capacity can be difficult to achieve and consideration was given to
employing the latest technology, especially where this would yield additional
economic and/or environmental benefits.
One such technology potentially contributing to the achievement of the above aims is Voltage Sourced Converter (VSC) High Voltage Direct Current (HVDC) transmission. Furthermore, VSC HVDC is, in principle, well suited
to multi-terminal applications which would allow optimised designs integrating
onshore and offshore networks to be achieved and such solutions are under
consideration for the GB transmission system. However, while the technology is
believed to be achievable, National Grid has not previously implemented VSC
HVDC on the GB transmission system and multi-terminal VSC HVDC has not
previously been implemented anywhere.
The objective of the project is to improve understanding of the problems of
VSC HVDC integration into the existing
transmission system. The project aims to make progress in three related areas:
- Multi-terminal VSC HVDC operation
- AC/DC VSC HVDC interaction – control
- AC/DC VSC HVDC interaction – detailed model (fast transients).
These areas have been identified as requiring to be addressed as part of the risk
managed introduction of the technology onto the transmission system. The
project will deliver reports on the results of studies and a documented set of
models for use in NGs internal system studies. The work forms an
essential step in being able to implement the technology on the transmission
It is important that at all stages a close working relationship is maintained
between NG engineers and University of Manchester researchers in
order to ensure timely transfer of knowledge.