Developing a thermally compensated electrolyser model coupled with pressurised hydrogen storage for modelling the energy efficiency of hydrogen energy storage systems and identifying their operation performance issues

Developing an effective capacity sizing and energy management model for integrated hybrid photovoltaic-hydrogen energy systems within grid-connected buildings

“…To allow a better observation of the developed energy management process, Figure 8 shows the hourly energy management of the proposed system scenario over one summer week and Figure 9 shows this for one winter week. It can be seen from Figure 8 that during the time interval (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18), the PV production is high and thus the electrolyser is operating, without exceeding its rated capacity, to store the PV surplus electricity in the form of green hydrogen. Simultaneously, the mass status of hydrogen in the tank is seen increasing from around 22.66 kg to 443 kg of hydrogen and the operating pressure building-up to approximately 40 bar, indicating that the storage vessel is filling up with the green hydrogen generated.…”

“…Other energy modelling software tools include ANSYS, which can simulate and assess the performance of hydrogen electrolysers and fuel cell stacks, however cannot simulate the entire operation of green hydrogen-based energy systems [12], and thus cannot guarantee the energy balance between renewable power input and load consumption. A detailed mathematical modelling and simulation of green hydrogen-based energy systems can be found in HYDROGEMS software, available as part from TRANSYS 16, however it is not capable of sizing the overall energy system [13]. Thus, developing a model that can size and simulate the entire operation and energy management of HESS when integrated with renewables is a challenging task.…”

Towards a comprehensive understanding and assessment of Offshore Energy Hubs with a hydrogen focus: An evolutionary perspective

“…The literature in this category covers multi-carrier energy systems (including H2) [15,16,25,26], 'hybrid energy system' [24], 'electric network design' [31,32] and 'energy planning' [33]. It suggests that natural islands could serve as energy hubs, but it remains unclear whether they could function as centralized systems for various energy sources and destinations.…”

Technical feasibility evaluation of a solar PV based off-grid domestic energy system with battery and hydrogen energy storage in northern climates

“…Pressurised gas storage is currently the most suitable approach for residential homes from a technical maturity point of view [5]. The self-discharge rate from undamaged pressurised hydrogen storage is low, because of measures taken for safety reasons [6], and storage capacity is easily scalable, making it suitable for seasonal storage. However, the round-trip efficiency of hydrogen conversion is poor compared to electrochemical batteries, which makes hydrogen storage unfavourable for shorter storage cycles [7].…”