Abstract
Abstract Combustion of fossil fuel by single-cycle gas turbines in offshore oil and gas (O&G) facilities on the Norwegian continental shelf contribute significantly to Norway’s total greenhouse gas emissions. The CleanOFF Hub Research Project aims to reduce those emissions through innovative solutions, such as large-scale offshore hubs delivering low-carbon power to O&G platforms. Within this context, this paper presents an advanced electromagnetic transient (EMT) model for a hydrogen-based energy hub connected to a gigawatt-scale wind farm, designed to power six isolated O&G platforms. Building on previous research, this paper introduces an EMT model that addresses earlier limitations in simulating fast electrical transients and incorporates a more sophisticated virtual synchronous machine (VSM) architecture enabling the study of critical millisecond scale transient phenomena. Key contributions include the development of a publicly available EMT model of a gigawatt-scale wind-powered system with primary and inertial frequency control reserves provided by four VSMs, and the integration of secondary reserves from large grid-following electrolyser and fuel cell systems. These advancements facilitate robust analyses of dynamic behaviors and stability challenges in large-scale, isolated offshore power systems, contributing to the goal of decarbonizing the Norwegian continental shelf.