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Charging method and system for electric vehicles distributed in wide area

A technology of electric vehicle and charging method, applied in the field of electric vehicle charging method and system

Active Publication Date: 2020-02-04
STATE GRID ELECTRIC VEHICLE SERVICE CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these studies comprehensively consider the joint operation optimization of electric vehicles, distributed power sources and energy storage systems, they are basically researched only from the perspective of electric vehicle regulation, which cannot solve the problems of power demand, load characteristics and gasoline consumption. influences

Method used

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  • Charging method and system for electric vehicles distributed in wide area
  • Charging method and system for electric vehicles distributed in wide area
  • Charging method and system for electric vehicles distributed in wide area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Example 1: A hierarchical control strategy for orderly charging of electric vehicles with good scalability. Such as figure 1 As shown, the hierarchical strategy proposed by the present invention is divided into three layers: main control center, secondary control center, and electric vehicle.

[0084] Each layer carries out the control activities of each level relatively independently on the basis of obeying the main control target through synergy and complementarity, and provides flexibility and independence for each level's own control activities on the basis of meeting the overall control target.

[0085] Among them, the main control center establishes a two-stage optimization model with the goal of peak shaving and valley filling based on the energy and power boundaries of electric vehicles given by the secondary control center and the output forecast and new energy abandonment rate given by new energy power generation, and calculates The electric vehicle charging ...

Embodiment 2

[0148] Embodiment 2: Based on the same inventive concept, the present invention also provides an algorithm for the hierarchical control model of ordered charging of electric vehicles, the process of which is as follows figure 2 shown.

[0149] First, the electric vehicle uploads information such as power, capacity, SOC (State of Charge, battery charge state), charging start and end time, etc. to each secondary control center; each secondary control center calculates the constraints of the electric vehicle and uploads it to the main control center; The control center solves the two-stage optimization model according to the constraints uploaded by the secondary control center and the predicted output uploaded by the new energy power generation, and obtains the load guidance curve and new energy output of each secondary control center; the secondary control center uses the centralized / The distributed control strategy guides the charging load of electric vehicles to follow the g...

Embodiment 3

[0150] Embodiment 3: Carry out calculation example simulation on the process of the above embodiment 2 by means of simulation

[0151] 1. Simulation settings

[0152] It is assumed that there are three secondary control centers A.B.C under the main control center. The daily peak loads are 3715kW. 4000kW. The loads corresponding to the distribution network area of ​​A and C two-level centers are mainly residential loads, the corresponding area loads of B secondary centers are mainly industrial and commercial loads, and there are new energy power generation mainly based on wind power in area B. The conventional load curve and predicted wind power output in the corresponding area of ​​the tertiary center (the wind power output data comes from a wind farm in a certain area in North China) are as follows: image 3 shown.

[0153] Here, the rated charging power of the electric vehicle is set to 7kW, and the battery capacity is 32kWh. The distribution of parameters such as the num...

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Abstract

The invention discloses a charging strategy and system for large-scale electric vehicles distributed in a wide area. The charging strategy for the large-scale electric vehicles distributed in the widearea comprises the following steps: battery information and charging time of the electric vehicles are brought into optimization models of secondary control centers and calculated on the basis of thesecondary control centers; calculation results and predicated output of new energy power generation are brought into a two-stage optimization model and calculated to obtain load guidance curves of the secondary control centers; a charging load following guidance curve of each electric vehicle under the corresponding secondary control center is formulated on the basis of the corresponding load guidance curve; and the electric vehicles are charged according to the charging load following guidance curves. According to the charging strategy and system for the large-scale electric vehicles distributed in the wide area, the strategy of ordered charging load following of the electric vehicles can be embedded into a hierarchical control strategy, and through the hierarchical control strategy, thepurpose of writing cooperation control over the large-scale electric vehicles distributed in the wide area during charging, and clean energy power generation can be achieved, so that a charging behavior for the electric vehicles can be better matched with the intermittent new energy power generation, and then economic benefits and social benefits are created for the society, power grid and electric vehicle operators.

Description

technical field [0001] The invention relates to the fields of electric vehicle charging, new energy consumption, computer technology, etc., and specifically designs a wide-area distribution electric vehicle charging method and system. Background technique [0002] The charging demand of electric vehicles is both controllable and random. In addition, clean energy power generation, mainly wind power and photovoltaic power generation, is limited by natural conditions, and its output is random and intermittent. How to consider the uncertainty of the charging demand of electric vehicles and the output of clean energy power generation, solve the shortcomings of current high-power wired charging equipment such as complex structure and large impact on the power grid and batteries, and realize the coordination of large-scale electric vehicles and clean energy power generation Orderly charging control, which can realize the cleanliness of electric vehicles under the coordinated charg...

Claims

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Application Information

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IPC IPC(8): B60L58/12G06Q10/04G06Q50/06
CPCG06Q10/04G06Q50/06Y02T10/40Y02T10/70
Inventor 史双龙严喆李帅华邢宇恒江正涛
Owner STATE GRID ELECTRIC VEHICLE SERVICE CO LTD
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