Abstract
The rapid development of renewable energy, represented by wind and photovoltaic, provides a new solution for island power supplies. However, due to the intermittent and random nature of renewable energy, a microgrid needs energy-storage components to stabilize its power supply when coupled with them. 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. First, a mathematic formulation of seawater-pumped storage station with renewable energy is presented. Then, to reach the goal of economic dispatch, an optimal scheduling model of island microgrid is established with the consideration of both respective operation constraints and island load requirements. Finally, the effectiveness of the proposed model is verified by an island microgrid over two typical seasons. The simulation results show that the proposed framework not only increases the usage of renewable energy, but also improves the operational reliability and economy of island microgrids.
Highlights
As many island micro grids are not connected with the continent [1,2,3], distributed renewable power and generators have become the major sources of island power supply
This study focuses on the days-ahead optimal scheduling method—as well as the model of island microgrids that couple with seawater-pumped storage stations and renewable energy
Based on the equivalent model of seawater-pumped storage station’s reservoir, the optimal scheduling method model of seawater-pumped storage station in island microgrid is established for the first time; A coordinated optimal dispatching model of seawater-pumped storage station and renewable energy is suggested; An optimal scheduling method for island microgrid with seawater-pumped storage station is proposed for the first time
Summary
As many island micro grids are not connected with the continent [1,2,3], distributed renewable power and generators have become the major sources of island power supply. 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] It is both promising and necessary to conduct research on the optimal scheduling of island microgrid with seawater-pumped storage stations. Based on the model of renewable energy and seawater-pumped storage station, reference [15] suggested a scheduling method for island microgrid with wind–light-marine storage. In reference [18], based on the working mechanism of seawater-pumped storage station, the role it played in improving island power supply capacity is studied, and the coordinate operation prospect of seawater-pumped storage station and renewable energy is introduced. In reference [23], the coordinated optimal operation method of seawater-pumped storage station and offshore wind power generations is studied, while a series of simulations on Rhode Island were performed to ensure the effectiveness of proposed method. A coordinated optimal dispatching model of seawater-pumped storage station and renewable energy is suggested; An optimal scheduling method for island microgrid with seawater-pumped storage station is proposed for the first time
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