Micro-grid energy management method based on hybrid energy storage and electric automobiles

Abstract

The invention provides a micro-grid energy management method based on hybrid energy storage and electric automobiles and belongs to the field of power grid management. The micro-grid mentioned in theinvention is a distributive renewable energy source wind-PV(Photovoltaic)-ES(Energy Storage) grid-connected micro-grid. The micro-grid energy management method divides an energy management strategy into a peak-clipping valley-filling phase and a power fluctuation suppression phase. In the peak-clipping valley-filling phase, according to power generation predication and load predication technologyof distributive renewable energy sources such as wind power, photovoltaic power and the like, electric automobile slow charging periods are translated through a way of price support, and through combination with charging and discharging of an energy storage battery and power interaction between micro-grid connecting wires and external large power grids, peak-clipping valley-filling of power of theconnecting wires of the micro-grid is realized. In the power fluctuation suppression phase, considering the exertion fluctuation of wind power generation and photovoltaic power generation, and considering the large power and high stochastic behaviors of quick charging of the electric automobiles, a hybrid energy storage system is formed by a super capacitor and the energy storage battery for commonly suppression on power fluctuation of the connecting wires of the micro-grid. Finally, energy optimized control of the connecting wires of the micro-grid is realized.

Description

technical field [0001] The invention belongs to the field of power grid management, and in particular relates to an energy management method for a microgrid. Background technique [0002] With the large-scale decentralized access of wind turbines, photovoltaic cells, and electric vehicle fast charging piles, the power peak and valley characteristics of the micro-grid tie-line caused by renewable energy power generation and electric vehicle fast charging are adjusted, and the short-term power of the tie-line is adjusted. Effective suppression of fluctuations is of great significance to ensure the capacity of renewable energy consumption, improve the stability of microgrid grid connection, and enhance the safety and reliability of microgrid operation. However, how to reduce the microgrid investment cost and optimize the energy storage capacity under the premise of reducing the peak-valley level of the microgrid tie line and smoothing the short-term power of the tie line requir...

AI Technical Summary

Problems solved by technology

However, although the existing patents perform peak-valley regulation and power fluctuation control on the power of the microgrid containing electric vehicles through relevant energy management and optimization strategies, they do not comprehensively consider the impact of different charging modes of electric vehicles on the operation of the microgrid. Cooperative management of electric vehicle groups and microgrid energy storage systems is not carried out according to the time scale under different energy management tasks

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