Sensitivity analysis of the response of a scaled power cable for application in offshore renewable energy

Abstract

Effective operation of offshore renewable energy systems relies on the robust design of reliability-critical components like dynamic power cables. These cables endure significant loads induced by waves, currents, and platform motion. Current design practices recommend the adoption of compliant shapes such as the lazy wave to reduce bending and tensile stress. A combination of numerical modeling and scaled physical testing mitigates reliability risks, ensuring robust power transmission. To this end, this paper investigates the sensitivity of a scaled dynamic cable assembly using a structural finite element software, OrcaFlex, for tank testing at the Flowave facility. Parameters like cable stiffness, material density, and metocean conditions are examined to understand the model’s sensitivities. The cable assembly, modelled at 1:50 scale in a lazy wave configuration, considers the current-induced response of the cable. The results identify uncertainties in numerical modeling to enhance cable design robustness.