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A centralized control method for grid-connected charging and discharging of large-scale electric vehicles

An electric vehicle, centralized control technology, applied in the direction of electric vehicle charging technology, electric vehicles, charging stations, etc., can solve the problems of energy waste and failure to provide a good energy storage system, so as to avoid peak-on-peak and facilitate safe and stable operation , The effect of ensuring voltage stability

Active Publication Date: 2019-08-06
NANJING INST OF TECH
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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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  • A centralized control method for grid-connected charging and discharging of large-scale electric vehicles
  • A centralized control method for grid-connected charging and discharging of large-scale electric vehicles
  • A centralized control method for grid-connected charging and discharging of large-scale electric vehicles

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] The invention provides a centralized control method for grid-connected charging and discharging of large-scale electric vehicles, which specifically includes the following steps:

[0028] Step 1: Establish a nine-zone map control strategy for centralized control of large-scale electric vehicle charging and discharging, such as figure 1 As shown, take the bus voltage amplitude U on the low-voltage side of the electric vehicle centralized charging and discharging station as the abscissa, and the grid load margin index value μ as the ordinate to form a U-μ plane; the nine-zone diagram consists of two voltages parallel to the X axis The upper limit straight line, the voltage lower limit straight line intersect with two margin index lower limit straight lines and margin index upper limit straight lines parallel to the Y axis.

[0029] The specific control strategies...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00B60L55/00B60L53/63B60L53/64
CPCB60L53/63B60L53/64B60L55/00H02J3/00H02J3/008H02J2203/20Y02T10/70Y02T10/7072Y02T90/12
Inventor 李升吴恒李聪睿王硕宗书怡王中巍
Owner NANJING INST OF TECH
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