Centralized control method of large-scale electric automobile grid-connected charge and discharge

Abstract

The invention discloses a centralized control method of large-scale electric automobile grid-connected charge and discharge. Firstly a nine-area diagram is divided on a U-mu plane formed by the low voltage side bus voltage amplitude U of an electric automobile centralized charge and discharge station and a power grid load margin index value mu according to the upper and lower limits of the reasonable operation range of two variables, and the control strategy of the corresponding electric automobile charge and discharge behavior of each area is formulated; then real-time operation data closely related to the power grid voltage stability are inputted according to a trained support vector machine optimal model so that the current maximum load parameter prediction value of the power grid is acquired, and the current load margin index value is calculated; and the area of the current operation point in the nine-area diagram is determined by combining the real-time value of the charge and discharge station low voltage side bus voltage amplitude, and then the electric automobile charge and discharge behavior is controlled according to the control strategy of the area so that the voltage stability of the power grid in large-scale electric automobile charging and discharging can be effectively guaranteed, the peak shaving effect can be realized and safe and stable operation of the power grid can be maintained.

Description

technical field [0001] The invention relates to a centralized control method for grid-connected charging and discharging of large-scale electric vehicles, belonging to the technical field of electric vehicles and electric power engineering. Background technique [0002] With the increase of population and the expansion of economic scale, the consumption of traditional fossil energy has been intensified and the concentration of carbon oxide emissions has been increased. Therefore, it is imperative to save energy, reduce emissions, and develop low-carbon energy. Electric vehicles mainly rely on electric power to drive and have the characteristics of low noise, no pollution and zero emissions. They must be one of the focuses of the future development of the automotive industry and new energy. Developing the V2G mode of energy interaction between electric vehicles and the grid is of great strategic significance to the development of large-scale electric vehicles. At present, th...

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Problems solved by technology

How to make good use of large-scale electric vehicles to increase the safe and stable operation of the power grid is a current research hotspot, and it is also a solution to the problem of energy waste caused by wind power, photovoltaic power generation, tidal power and other new energy power generation due to the inability to provide a good energy storage system

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