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.
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 ].
However, by introducing seawater-pumped storage station, the curtailments of rigid loads and renewable energy were reduced, and the expense growth of island microgrid would become slower. Hence, the scheduling model proposed in this study could reduce the total operation and maintenance costs of island microgrid system obviously. 5. Conclusions
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, 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 ].
To maintain energy balance, the seawater-pumped storage station, renewable energy, diesel generator and interruptible loads are all involved in the power regulation of the island microgrid. Figure 1. Framework of proposed island microgrid system. 2.2. Optimization Framework
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