Power Flow Optimization for an Offshore Multi-energy System

The increase of offshore PV and wind power installation capacity can increase the uncertainty and randomness of the power system. Therefore, it is necessary to study the offshore multi-energy system. A traditional offshore community with hybrid energy storage system (HESS) installation usually participates in demand response program to improve system economy. However, due to the high price and low discharge power of the HESS, it cannot response to the loads effectively. This paper introduces water electrolysis and on-board hydrogen storage technologies to an offshore multi-energy system, so as to effectively optimize the operation of system. Subsequently, to analyze the impact of climate change on system operation, the concept of loads matching degree is firstly defined. Finally, this paper gives a suggestion for an existed offshore multi-energy system on how to reasonably increase renewable generation system installation capacity. Results show that compared with the traditional offshore multi-energy system, the improved system can significantly reduce system operation costs and carbon emissions by 23.02% and 48.43%, respectively. Additionally, with the increase of loads matching degree, offshore system optimal operation costs, carbon emissions and the amount of hydrogen produced by water electrolysis reduce significantly. Finally, the growth of renewable energy generation capacity can lead to the reduce of emissions and increase of operating costs.