Call for proposals from companies and consortia interested in undertaking a project to develop a toolbox to for frequency domain stability analysis. The toolbox should enable scalable, high-throughput analysis while maintaining the fidelity required for identifying and characterising potential stability issues in the context of offshore wind. A critical component of the toolbox development is the standardisation of model formats for key system elements, including Wind Turbine Generators (WTGs), Static Synchronous Compensators (STATCOMs) and High Voltage Direct Current (HVDC) systems. These models must reflect operating point dependencies such as active power, reactive power, and voltage to capture the non-linear dynamics of power electronic converters.

The main objectives of this work are to:

• Develop a robust and adaptable software toolbox capable of performing Frequency-Domain Stability Analysis (FDSA) for offshore, supporting both grid-following and grid-forming converter technologies.
• Enhance standardisation and interoperability through consistent model formats for WTGs, STATCOMs, and HVDC systems, improving compatibility across platforms.
• Provide scalable and efficient analysis that allows large-scale scenario screening with high throughput, saving time compared to traditional time-domain simulations. 

Clarification questions should be received by 7 January 2026 at 17:00 GMT and the answers to these questions will be posted below on 14 January 2026.

The closing date to receive tender submissions is 21 January 2026.

All bidders should be available for interview on the week commencing 2 February 2026.

All clarification questions and tender submissions should be sent electronically, by their respective deadlines, to James Inkpen at james.inkpen@carbontrust.com and Ciara Ritson-Courtney at ciara.ritson-courtney@carbontrust.com.