Power systems globally are seeing increasing penetration of power electronics interfaced generation. A significant proportion of this generation will be converter interfaced, reducing the overall percentage of synchronous generation connected to the electricity system. This poses a stability challenge given that many stability requirements (including inertia and black start) have been traditionally provided by synchronous generation. Motivated by this challenge, this Offshore Wind Accelerator (OWA) study investigated the addition of a storage system with innovative converter control to the onshore substation of an AC-connected offshore wind farm.

The primary objectives of the study were to:

• Improve understanding of available technologies, control approaches and their ability to provide grid services.
• Use cost-benefit analysis to inform the investment case for installing these technologies at a range of typical sites.
• Understand the route to market for these systems including required Grid Code changes, ownership rules and dispatch considerations.
• Develop a roadmap for future investigation including potential simulation and demonstration projects.