| In order to achieve sustainable development of society and alleviate the problem of energy depletion and environmental pollution,distributed power generation technology has been vigorously developed.Distributed power sources,which can effectively utilize renewable energy such as photovoltaics and wind power in the region,combined with the adjustability of energy storage systems and controllable power supplies can be integrated into a microgrid system.Therefore,the microgrid has the advantages of being clean and flexible,and can promote the elimination of clean energy.The power grid outside is used as spares to ensure the reliability of power supply.It is a key component of the distribution network and the future smart grid.Whether the microgrid can maximize the benefits through the coordinated operation of internal source-storage-load is the key to promoting the development and wide application of microgrid.Therefore,this paper considers the movable load to optimize the "source-storage-load" interaction and coordination operation of the microgrid with energy storage system,and comprehensively evaluate the operational benefits of the microgrid.The main research contents are as follows:Firstly,the component structure and operation characteristics inside the microgrid are analyzed.The microgrid integrates a variety of distributed power sources,and is equipped with energy storage systems and user-side demand response.Through the complementary characteristics of various energy sources in time and space,the management information system is used to smooth load curves and power output curves to realize the coordinated optimization operation of the microgrid.Therefore,this paper analyzes the operating characteristics of the internal components of the microgrid,including photovoltaic,wind power,micro-combustion engines,fuel cells and energy storage systems,and studies its power generation output characteristics and operating cost functions to lay the foundation for the coordinated optimization operation of the microgrid.Then,the microgrid source-storage-load interaction coordination optimization model is constructed.Microgrid optimization should not only consider the overall benefit maximization,but also pay attention to the cost of the internal power generation side.Therefore,based on the theory of bi-level programming,a two-layer optimization model of microgrid coordinated operation considering the demand response is constructed,and the objective of upper layer is maximizing the relative benefit before and after load optimization.The lower layer aims to minimize the power generation cost of the power generation side.A microgrid in the north China is selected for case analysis.The results show that the energy storage system and demand response can effectively enhance the flexibility and reliable of the microgrid,through double-layer optimization during grid-connected operation,not only improves the overall efficiency of the microgrid,but also reduces the power supply cost of the power generation side,so that the operating efficiency of the microgrid is optimized and has certain practical value.Finally,a comprehensive evaluation model for the operation efficiency of the microgrid is designed.The operation benefit evaluation index system of microgrid is constructed from the four dimensions of economic benefit,social benefit,energy saving benefit and environmental benefit.The weight of each index is calculated by the anti-entropy weight-AHP combination weighting model,and multi-level fuzzy comprehensive evaluation and the TOPSIS comprehensive evaluation method construct a microgrid operation benefit evaluation model.The results of the example show that the constructed model can comprehensively and effectively evaluate the operational benefits of the microgrid,and optimize the optimal operation plan to provide decision support for the sustainable development of the microgrid. |
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