The emergence of seawater-pumped storage stations provides a new method to offset the shortage of island power supply. In this study, an optimal scheduling of island microgrid is proposed, which uses seawater-pumped storage station as the energy storage equipment to cooperate with wind, photovoltaic and diesel generator.
Electric power supply capacity of island micro grids is relatively weak, as a result of being separated from the continent. Most of them rely heavily on the distributed generators and renewable energy generation systems for power supply.
In addition, the equivalent SOC of seawater-pumped storage station meets the upper and lower bound constraints simultaneously, which means that the seawater-pumped storage station could satisfy the power regulation of proposed island microgrid in the future without expansion.
In addition, some Japanese scholars have carried out theoretical research in the field of power system with seawater-pumped storage stations and renewable energy. For example, a construction and operation scheme of seawater-pumped storage station is proposed in reference [ 14 ].
Since the lower reservoir of seawater-pumped storage station is the ocean, the water resource is unlimited. Hence, the capacity of seawater-pumped storage station can be considered as almost infinite, and only the water amount of the upper reservoir needs to be considered in the optimal scheduling.
Since the ocean may be regarded as an infinite natural reservoir, building seawater-pumped storage stations on islands has some natural advantages. These pumped-storage stations play an auxiliary role in island power supply and can be considered as a new type of energy storage system [ 11, 12 ].
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