Transient simulations of offshore substation installation by heavy lift vessel from a moored barge in OrcaFlex

Abstract

Offshore wind energy is growing, and with it the need for safe and effective ways to deploy vital infrastructure, such as offshore substations. With an emphasis on the use of heavy lift vessels (HLVs) from moored barges, this thesis conducts a thorough investigation of the optimization possibilities in offshore substation installation. Using precise parameters transient simulations run in OrcaFlex, this study attempts to clarify the complex dynamics regulating these installations in order to improve operating efficiency and reduce related expenses and hazards. The basis of the study is the creation of a strict numerical model that includes the complex interactions between the offshore substation structure, the moored barge, and the HLV. Numerous environmental factors, including waves, wind, and current conditions, are taken into consideration in this model as they have a big impact on installation procedures. By carefully adjusting and verifying its predictions against real-world data and industry norms, the model guarantees a high level of accuracy. Principal goals comprise an extensive investigation, starting with the study of vessel dynamics in various environmental conditions. Through an examination of variables including wave-induced movements, dynamic positions, and stresses in the mooring lines, the study aims to pinpoint crucial operating boundaries and possible obstructions. After that, optimization techniques are developed and assessed, with an emphasis on minimizing the total project duration and cost and optimizing installation procedures while maintaining safety requirements. The study technique comprises a methodical investigation of several installation situations for three main stages: 1- Pick-up of OSS 2- Transfer to installation radius 3- Setting down on MSF, while taking into account substation characteristics, water depth, and sea state. The study examines the effects of operational factors on important performance measures, such as installation time, cost, and safety margins, using sensitivity analysis and iterative simulations. The creation of adaptable operating protocols that can consider unanticipated events and changing environmental conditions is given special attention. The ultimate goal of this project is to offer practical advice and best practices for installing offshore substations using HLV from moored barges. It aims to boost offshore wind energy infrastructure development by clarifying the complex interdependencies present in such operations and providing strong optimization solutions. The expected results include faster, more affordable, and safer installation procedures, which will support the long-term expansion of the offshore renewable energy market.