Communication of System Wide Quantities
National Grid Electricity System Operator
National Grid TO Innovation Team
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Innovation Funding Incentive
Gas Distribution Networks
The unreliability and instability of Loss of Mains (LoM) protection is a well know
problem. This protection is designed for avoiding any embedded station being
islanded but is triggered unnecessarily by disconnection of generation under
large system disturbances conditions (eg large loss of infeed or generation).
This could be a risk to system security. As the volume of embedded plant has
increased to over 6 GW and is expected to continue to increase, the risk on the
system will become unmanageable. There is therefore an urgent need to
improve the reliability performance of this type of protection. The proposed
project is to explore an alternative way of using up-to-date technology for LoM
protection without jeopardising system security.
This research project will investigate the potential for further improvement of
the stability of DG connections during system-wide events by taking advantage
of existing and emerging communication technologies such as satellite and/or
internet. Satellite communications may form a particularly viable solution for
remote and offshore locations (where many wind farms are, or will be,
installed); whereas internet could preferably be used in urban areas. Satellite
communications have not been widely applied in protection systems due to the
assumed limited (or rather unknown) reliability of this medium. Therefore, it is
believed that in addition to the development of novel LoM methods, the key to
the successful deployment of such technologies in the protection domain is the
rigorous assessment of the reliability of the communication media.