Abstract
The hybrid renewable energy system is a promising and significant technology for clean and sustainable island power supply. Among the abundant ocean energy sources, tidal current energy appears to be very valuable due to its excellent predictability and stability, particularly compared with the intermittent wind and solar energy. In this paper, an island hybrid energy microgrid composed of photovoltaic, wind, tidal current, battery and diesel is constructed according to the actual energy sources. A sizing optimization method based on improved multi-objective grey wolf optimizer (IMOGWO) is presented to optimize the hybrid energy system. The proposed method is applied to determine the optimal system size, which is a multi-objective problem including the minimization of annualized cost of system (CACS) and deficiency of power supply probability (DPSP). MATLAB software is utilized to program and simulate the hybrid energy system. Optimization results confirm that IMOGWO is feasible to optimally size the system, and the energy management strategy effectively matches the requirements of system operation. Furthermore, comparison of hybrid systems with and without tidal current turbines is undertaken to confirm that the utilization of tidal current turbines can contribute to enhancing system reliability and reducing system investment, especially in areas with abundant tidal energy sources.
Highlights
Ocean contains inexhaustible clean energy and abundant natural resources, such as oil, natural gas, minerals, biological resources, etc., which will be an important guarantee for human survival and sustainable development in future
Where Cp is the power coefficient of tidal current turbine (TCT), which is essentially the ratio of the mechanical power obtained by TCT, taking into account the conversion efficiency. ρ is the density of seawater, A is the cross-sectional area of TCT, vtid is the tidal current velocity
In order to evaluate the performance of the improved algorithm, the improved multi-objective grey wolf optimizer (IMOGWO) is compared to the multi-objective grey wolf optimizer (MOGWO) and the well-known algorithm Multi-Objective
Summary
Ocean contains inexhaustible clean energy and abundant natural resources, such as oil, natural gas, minerals, biological resources, etc., which will be an important guarantee for human survival and sustainable development in future. According to the reviews on development and research status of island power systems, most island microgrid projects that have been built or are under construction are connected to mainland power grid [25], the reliability of energy supply is always guaranteed, optimization results are not applicable to the island situation. Different types of large tidal current turbines such as DCNS OpenHydro, Atlantis AR1000, SeaGen S (2 MW), and Sabella D10, have been produced and tested in recent years The majority of these turbine technologies has achieved megawatt-level power capacity and will be utilized to supply electricity to coastal areas or remote islands in the coming years. Comparison of a microgrid with and without tidal current turbines is is analyzed confirmthat thatthe theutilization utilizationofoftidal tidalcurrent currentenergy energycan cancontribute contribute to to enhancing enhancing system analyzed toto confirm system reliability system investment Section to 4 is to theofimprovement of constraints areconstraints presented in
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