Isolated micro-grid hybrid energy storage optimal configuration method

Abstract

The invention provides an isolated micro-grid hybrid energy storage optimal configuration method. Micro-grid power supply load unbalanced power and total loads in a micro-grid are integrally considered, influences of factors that intermittent energy and load conditions fluctuates with time in the system on isolated micro-grid hybrid energy storage capacity configuration are comprehensively considered, and the isolated micro-grid hybrid energy storage capacity optimal configuration is established; in addition, a genetic algorithm is utilized for solves isolated micro-grid hybrid energy storage capacity optimal configuration models corresponding to different splitting and decomposition modes of the power supply load unbalanced power, and an isolated micro-grid hybrid energy storage optimal scheme more according with reality is determined by selection, so that the practical isolated micro-grid hybrid energy storage configuration programming requirements are better met, the utilization rate and the service lifetime of the isolated micro-grid hybrid energy storage capacity configuration are improved, the operation economy is enhanced, the comprehensive utilization cost of the isolated micro-grid is lowered, and the isolated micro-grid hybrid energy storage optimal configuration method can be widely applied to hybrid energy storage capacity optimal configuration of the isolated micro-grids.

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 ...

AI Technical Summary

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

Images