Offshore Wind Accelerator: Sequence impedance of submarine cables

Call for entries from companies and consortia interested to undertake a study for the OWA Cables Technical Working Group (TWG-C) to enhance the accuracy and consistency of cable impedance modelling across the supply chain by providing a common reference point and contribute valuable insights to the broader wind energy industry.

Project objectives:

The main objectives of this work are to:

  • Conduct a comprehensive examination of present cable impedance models used in wind farm electrical system analysis. Identify and document limitations to understand how they impact the accuracy of analyses.
  • Devise and validate a set of benchmark calculations, examining the mathematical and physical foundations. The primary goal is to challenge and enhance existing cable impedance models, specifically tailored for offshore wind applications and prevalent cable types, with a focus on harmonics N=1:50. Explore various methodologies, including analytical and finite element approaches, to provide a comprehensive evaluation. Identify and compare different methods to establish a 'standardisable' approach that ensures consistency across applications.
  • Explore the impact of potential variance in input parameters, such as manufacturing tolerances on key dimensions, and variations induced by temperature changes. Provide insights into how these uncertainties affect impedance values, enabling a nuanced understanding of the reliability of the results. Emphasize the importance of considering normal production tolerances and temperature variations in cable impedance calculations, ensuring a more realistic and robust analysis.
  • Compile project outcomes into a comprehensive report and support in its dissemination. Provide the validated benchmark models to the industry for comprehensive evaluation and adoption.

Preferred experience:

The type of Contractor expected to be best suited to delivering this work is an independent academic, consultant, or research institute. The ideal contractor would: 

  • Have in-depth understanding of sequence impedance calculations, including the ability to validate benchmark calculations using rigorous mathematical and physical foundations; 
  • Be prepared to tackle the above without requiring extensive learning time; 
  • Be proficient in creating accurate models for electrical systems, particularly cable impedance models;


  • Applications open: 21 March 2024
  • Deadline for clarification questions: 15 April 2024
  • Clarification document published: 18 April 2024
  • Submission of full tender: 2 May 2024 17:00 BST

All clarification questions and tender submissions should be sent electronically, by their respective deadlines, to with in copy.

Offshore Wind Accelerator (OWA)