HVDC ‘bootstraps’ are becoming a key option in the reinforcement of the transmission system. As the generation mix moves towards renewables, sources are becoming more dispersed and located further from load centres, requiring extensive transmission network upgrades to get the power to where it is needed. As a result of restrictions in space and consenting issues locating new circuits onshore, there has been a move to locate new circuits offshore. This requires long cable circuits, where HVDC technology must be used. This note explores how the choice of HVDC technology can affect the system integration challenge of the required upgrades to the transmission system. Download file below.
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Protection schemes form part of the most fundamental components of any power system. They ensure that when faults occur on networks, the effect of the fault is seen only briefly by the wider system and its connections, isolating the faulted infrastructure or generator from the network, hence allowing the healthy elements to continue to operate. By doing so, risks to personnel and risks of damage to the infrastructure of the AC power system are reduced. This article explains how declining system strength presents challenges to confidence over future protection relay operation – and highlights how the HVDC Centre is helping to address these challenges. Click here to read the full briefing note or Download file below.
The Offshore Wind Industry Council (OWIC) transmission group sought guidance from the National HVDC Centre on options for de-risking integrated offshore transmission approaches in GB. The HVDC Centre in consultation with industry led publication of a report, which identifies that:
- Integrated offshore transmission is technically feasible for projects at design stage;
- Solutions can be built in stages to meet offshore wind growth and benefit the onshore grid; and
- Bipole HVDC with return cable option appear to offer greater flexibility and less export cables.
Click here for the full report published on 25 June 2020.