ENERGY STORAGE FOR PORT ELECTRIFICATION
The ESSOP decision support model allows ports to investigate the optimal mix of battery power rating, energy capacity and PV solar to achieve a minimum levelized cost of energy delivered to shore
• Grid connection capacity = 100kVA. The figures below show the battery behaviour in summer and winter, to observe the impact of seasonal PV solar variation. Performance of a system with 120kWp of PV solar capacity in Summer, showing the small amount of grid energy needed to supplement the solar power.
ESSOP has explored two ways in which ports can minimize their energy costs by using energy storage: • Optimising how to use PV solar generation to offset grid electricity. The wholesale price of energy varies every half-hour, and on a time-of-day tariff this variation is passed onto users.
These results show that an optimally sized PV solar + battery system can achieve (for some use-cases) both a lower cost of energy and a lower carbon content compared with a simple direct connection to the grid, as well as improved operational flexibility permitted by higher recharging power rating.
Energy storage is also needed to optimize utilization of in-port generation and avoid curtailment when generation exceeds the available demand. However, it is unclear how much PV solar generation and associated energy storage would achieve a minimum levelized cost of energy.
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