[Transient stability enhancement of mulit-infeed AC offshore islands for large-scale HVDC interconnection and wind integration (TS HVDC)

The integration of large-scale offshore wind farms with High Voltage Direct Current (HVDC) 
interconnections is vital to achieving global energy transition targets. However, the complex 
dynamics of these systems—especially when configured as multi-infeed AC offshore islands—
 pose significant challenges during transient disturbances such as AC and DC faults. Traditional 
methods fall short in addressing stability and control in such multi-infeed HVDC environments. 
To address this gap, a coordinated control strategy has been developed to enhance transient 
stability and system resilience. The strategy incorporates advanced control functions, including 
Fault Ride Through (FRT) capability, active power-frequency (P/f) droop control, and a central 
master controller. These elements work together to enable fault tolerance, manage power im
balances, and optimize post-fault recovery through dynamic adjustment of control set-points. 
This novel approach has been validated through comprehensive simulations in 
PSCAD/EMTDC, demonstrating strong performance across a range of fault scenarios. Build
ing on these promising results, the TS-HVDC project—led by Manchester Metropolitan Univer
sity (MMU) WSP, and Barcelona Tech (UPC)—aims to experimentally validate the strategy 
using hardware-in-the-loop testing at TECNALIA’s laboratories. 
Key aspects of the project include: 
• Coordinated control of HVDC interconnectors and offshore wind farms to ensure robust 
system response and recovery under various fault conditions, including both AC and 
DC disturbances. 
• Validation of the proposed control strategy through both detailed simulation studies and 
hardware-in-the-loop (HIL) testing, leveraging TECNALIA’s state-of-the-art laboratory 
facilities. 
The project’s outcomes are expected to offer crucial insights and practical guidelines for the 
future design and operation of resilient multi-infeed offshore energy systems, enabling secure 
and reliable integration of renewable energy at scale.