| With the implementation of China’s marine strategy, the marine economy has entered a stage of rapid development. As an important fulcrum and platform of marine economy, off-shore islands have great strategic significance in many fields. However, restricted by the special geographical environment, the development of off-shore island microgrid system is confronted with many challenges. The resources and energy supply in traditional isolated islands are still dependent on external input, which hinders the sustainable development of the islands. Off-shore islands are rich in renewable energy sources, and the mutually complement and coordinated utilization of resources in island group have great significance on the development of off-shore islands.Therefore, based on the issues related to the social form and the coordinated energy management of the off-shore island group, this dissertation introduces an original conceptual electric vessel, and studies the scheme of optimized energy management in island microgrid considering the temporal and spatial characteristics of electrical vessels, combining with existing micro-grid dispatch and control technology.For the transportation and electricity demand in off-shore islands, a conceptual electric vessel(EV) is put forward, and classified into three types: Regular EV, Operation EV and Taxi EV according to mentioned need. Parameter models of different types of electric vessels are modeled. The typical structure of island microgrid with wind-PV-wave-storage-load and its components are analysed. Considering the energy exchange between electric vessels and island microgrid, the framework of energy management system of island microgrid is established.According to the temporal and spatial driving characteristics of different types of electric vessels, based on stochastic simulation of the trip chain, a method to analyse electric vessels’ charging demand is proposed. The probability distribution of charcteristic variables in the trip chain are analysed and fitted. Monte Carlo simulation is used for the sample extraction from the complete trip chain to implement the simulation of electric vessels’ behavior and calculate the charging demand.Taking into account V2G and different modes of electric energy supplyment of electric vessels, a scheme of optimal energy management for island microgrid is proposed. At the same time, for the charge and discharge electric vessels, two control strategies are put forward on the basis of discharge lower limit. Taking the minimum total load variance as the goal and constructing the corresponding constraint conditions, the optimal energy management model for island microgrid is established. Finally, simulation examples demonstrate the effectiveness of the proposed scheme and the improved control stratage. |
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