Constrained by the expansion of the power grid, the development of offshore wind farms may be hindered and begin to experience severe curtailment or restriction. The combination of hydrogen production through electrolysis and hydrogen-to-power is considered to be a potential option to achieve the goal of low-carbon and energy security. This work investigates the competitiveness of different system configurations to export hydrogen and/or electricity from offshore plants, with particular emphasis on unloading the mixture of hydrogen and electricity to end-users on land. Including the levelized energy cost and net present value, a comprehensive techno-economic assessment method is proposed to analyze the offshore system for five scenarios. Assuming that the baseline distance is 10 km, the results show that exporting hydrogen to land through pipelines shows the best economic performance with the levelized energy cost of 3.40 $/kg. For every 10 km increase in offshore distance, the net present value of the project will be reduced by 5.69 MU$, and the project benefit will be positive only when the offshore distance is less than 53.5 km. An important finding is that the hybrid system under ship transportation mode is not greatly affected by the offshore distance. Every 10% increase in the proportion of hydrogen in the range of 70%–100% can increase the net present value by 1.43–1.70 MU$, which will increase by 7.36–7.37 MU$ under pipeline transportation mode. Finally, a sensitivity analysis was carried out to analyze the wind speed, electricity and hydrogen prices on the economic performance of these systems.

受电网扩容的制约，海上风电场的发展可能会受到阻碍，并开始出现严重的限电或限流。电解制氢与氢能发电相结合被认为是实现低碳和能源安全目标的潜在选择。这项工作调查了不同系统配置从海上工厂出口氢气和/或电力的竞争力，特别强调向陆地上的最终用户卸载氢气和电力的混合物。包括平准化能源成本和净现值，提出了一种综合技术经济评估方法来分析五种情景的海上系统。假设基线距离为10公里，结果表明，通过管道向陆地出口氢气显示出最佳的经济性能，平均能源成本为 3.40 美元/公斤。离岸距离每增加 10 公里，项目净现值将减少 5.69 MU$，只有离岸距离小于 53.5 公里，项目效益才会为正。一个重要的发现是船舶运输模式下的混合系统不受离岸距离的影响很大。在 70%~100% 范围内，氢气比例每增加 10%，净现值增加 1.43~1.70 MU$，管道运输方式下增加 7.36~7.37 MU$。最后，进行了敏感性分析，以分析风速、电力和氢价格对这些系统的经济性能的影响。