An Optimal Allocation Method of Hybrid Energy Storage in Isolated Microgrid

Abstract

The present invention provides a hybrid energy storage optimization configuration method for an isolated microgrid, which considers the unbalanced power of the microgrid power supply load and the total load in the microgrid as a whole, and also comprehensively considers the intermittent energy and load conditions in the system fluctuating over time Based on the influence of various factors on the configuration of hybrid energy storage capacity of micro-grid, the optimal configuration of hybrid energy storage capacity of isolated micro-grid is established, and the genetic algorithm is used to analyze the hybrid energy storage capacity of isolated micro-grid corresponding to the unbalanced power of power load in different splitting forms. Solve the optimal configuration model, and determine the optimal configuration plan of the hybrid energy storage that is more in line with the reality of the isolated microgrid, better meet the actual hybrid energy storage configuration planning requirements of the isolated microgrid, and thus help improve the hybrid energy storage capacity of the isolated microgrid The utilization rate and service life of the configuration can improve the operating economy and reduce the comprehensive utilization cost of the isolated microgrid system, which can be widely used in the capacity optimization configuration of hybrid energy storage in the microgrid.

Description

technical field [0001] The invention relates to power system planning technology, in particular to an isolated microgrid hybrid energy storage optimization configuration method, and belongs to the technical field of power system optimization planning. Background technique [0002] With the increasingly severe energy crisis and environmental pollution, renewable energy has received more and more attention in the development of electric energy. With the continuous expansion of wind energy, solar energy and other renewable energy sources connected to the grid, their inherent intermittent and random output has brought great difficulties to the grid dispatching operation. In order to reduce the impact of renewable energy access on the power grid, and to improve the shortcomings of high cost and poor controllability of single-unit access of renewable energy units, micro-grids emerged as the times require. A microgrid is a small controllable system that organically combines micro ...

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Problems solved by technology

[0012] The above method aims at smoothing power fluctuations and optimizing the allocation of energy storage capacity with the goal of improving economic benefits or reducing investment costs, which provides a good technical reserve for promoting the development of microgrids in my country, but there are also shortcomings: Not only does it contain intermittent energy sources, but it also contains time-varying loads. The energy storage configuration not only needs to stabilize the output fluctuations of intermittent energy sources, but also needs to consider the random fluctuations of loads and the characteristics of daily cycles; The suitable charging and discharging time spans are different. A specific type of energy storage system has the highest operating efficiency only within a specific charging and discharging time span. If the influence of this factor is not considered in the energy storage configuration process, all types of energy storage systems are treated equally , will greatly reduce the working efficiency and service life of the energy storage system; third, in the process of hybrid energy storage configuration, in order to make the best use of different types of energy storage systems, it is necessary to decompose the unbalanced power between the power source and the load , how to achieve the optimal decomposition of unbalanced power and maximize the advantages of hybrid energy storage is of great significance to practical engineering

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