HVDC interoperability is the capability of one manufacturer’s HVDC System (controls and main circuit) to work seamlessly with HVDC Systems from other manufacturers. This removes the need for AC conversion to transfer power from one manufacturer to another and is an essential step towards HVDC grids, increasing options for greater supply chain efficiency and future system operation. Without interoperability and a single supplier providing large parts of the developing offshore network, future network operation could be disproportionately exposed to outage risks.
This project seeks to develop and understand how such systems could be implemented and commercially established ahead of future demonstration. A technical model development will be performed and the outlines of a commercial framework investigated.
Benefits
Project AQUILA LITE aims to model interoperable Multi-Vendor DC-Hub, which will establish the foundations for DC-Grids in Great Britain. A multi vendor interoperable DC-Hub will reduce the need for onshore converter stations, thereby minimising costs and environmental impacts. By integrating various renewable energy sources and enhancing grid stability, the project supports the transition to a more sustainable and resilient energy system.
As this project is low TRL (Technology Readiness Level), a cost-benefit analysis is not required at this stage to meet NIA criteria. However, the implementation of the MVMT (Multi-Vendor Multi-Terminal) approach can significantly reduce the need for converter stations. Additionally, constraints can be avoided because if one of the connections fails, the power can be re-routed to another receiving station.
Description of Recipients of the Benefits:
Consumers: Lower energy costs due to more efficient energy distribution and reduced reliance on expensive fossil fuels.
Environment: Reduced environmental impact through minimised need for onshore converter stations and increased integration of renewable energy sources.
Learnings
Outcomes
The project has demonstrated multi-vendor HVDC interoperability in a laboratory environment and completed its commercial readiness work package, including gap analysis and assessment of legal, contractual and liability considerations. Early-stage analysis indicates the potential for savings, including a reduction in converter-related infrastructure from two new converters per additional wind farm connection with applied Aquila Lite concept. These outcomes improve confidence in the technical feasibility of the method and its potential commercial application. The project is considered to have contributed towards progression to a higher TRL, although further validation in more representative environments is required. Future projects should extend testing to additional vendors and more complex multi-terminal configurations to further develop the learning.
Lessons Learnt
An important lesson from the project is that, in addition to technical development, early alignment on complex contractual, legal and liability arrangements is critical to timely delivery of multi-vendor interoperability projects. Engagement with multiple OEMs has highlighted that vendor on-boarding and negotiation of commercial interfaces can take longer than anticipated and may affect programme timescales if not addressed early. Future projects should therefore allow sufficient time for these discussions and consider early development of common contractual principles to support more efficient delivery.