Charging and discharging scheduling method for electric vehicles connected to micro-grid

Abstract

The invention discloses a charging and discharging scheduling method for electric vehicles connected to a micro-grid. The method comprises the steps of: (1) determining a system structure of the micro-grid and the characteristics of various units; (2) building a micro-grid optimal scheduling target function of considering the battery depreciation cost of the electric vehicles under time-sharing electrovalence; (3) determining constraints of various distributed power supplies, batteries of the electric vehicles and the like and forming a micro-grid optimal scheduling model by the constraints and the micro-grid optimal scheduling target function; (4) determining the number, the start-stop time, the start-stop charged states and other basic calculated data of the electric vehicles connected to the power grid under the time-sharing electrovalence; and (5) solving the micro-grid optimal scheduling model through a particle swarm algorithm and determining the charge and discharge power when the electric vehicles are connected to the power grid. The batteries of the electric vehicles are connected to the micro-grid as mobile distributed energy storage devices to achieve the peak load shifting effect; the operation safety and stability of the micro-grid in the time-sharing electrovalence environment are improved; and the energy utilization efficiency and the power grid operation efficiency are simultaneously improved.

Description

technical field [0001] The invention relates to the field of micro-grid dispatching, in particular to a charging and discharging dispatching method for an electric vehicle connected to a micro-grid. Background technique [0002] Microgrid refers to a small power distribution system composed of distributed power supply and energy storage system. It is an autonomous system capable of self-control, protection and management. An important part of the grid. The basic goal of micro-grid optimal scheduling is to reasonably and effectively arrange the output of each distributed power source and the interactive power with the distribution network according to a certain control strategy on the premise of meeting the load demand of the micro-grid system, so that the entire micro-grid The operation and maintenance cost and emission cost are the lowest. [0003] With the increasing development of human society, energy and environmental issues are becoming more and more prominent. In or...

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Problems solved by technology

[0004] In the existing optimal dispatching methods considering the connection of electric vehicles to the microgrid, the depreciation cost of charging and discharging the batteries of electric vehicles is often not considered, which is not conducive to the economic management of the batteries of electric vehicles; in real life, the connection of electric vehicles to the microgrid The time, state of charge of the electric vehicle battery when connected and the minimum state of charge required by the electric vehicle battery when it is off the grid are different, and the existing scheduling methods that consider the connection of electric vehicles to the microgrid do not take this into account. In the scheduling model, it is not conducive to optimal scheduling of electric vehicles in real life

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