Charging pile bidirectional charging and discharging dynamic adjusting system adaptive to power grid load

Abstract

The invention discloses a charging pile bidirectional charging and discharging dynamic adjusting system adaptive to a power grid load, and relates to the technical field of charging pile dynamic adjustment. The charging pile bidirectional charging and discharging dynamic adjusting system comprises a data acquisition module which is used for acquiring operation data such as voltage, current and power of a power grid in real time; and the working state of the charging pile and the battery state of the electric vehicle, such as the state of charge (SOC) and the battery voltage. According to the charging pile two-way charging and discharging dynamic adjusting system self-adaptive to the power grid load, through mutual cooperation of the charging adjusting and controlling module and the discharging adjusting and controlling module, the system can automatically carry out two-way charging and discharging dynamic adjusting operation of the charging pile, so that too large impact on a power grid caused by charging of an electric vehicle is avoided, and the peak load pressure of the power grid is relieved; the voltage fluctuation and frequency deviation of the power grid are reduced, the stability and reliability of the power grid are improved, bidirectional energy interaction between the electric vehicle and the power grid is also realized, charging is carried out when the load of the power grid is off-peak and discharging is carried out when the load is peak, and the overall energy utilization efficiency of the power grid is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging pile dynamic adjustment, in particular to a charging pile bidirectional charging and discharging dynamic adjustment system self-adapting to power grid load. BACKGROUND

[0002] The charging pile is a device for charging electric vehicles, plug-in hybrid electric vehicles and other electric vehicles. The charging pile generally includes charging interfaces, charging control modules, metering and billing modules and other components. Users can connect electric vehicles to the charging pile to charge the electric vehicles through the charging pile. The charging pile is usually divided into different types, such as AC charging piles and DC fast charging piles, according to different charging speeds and charging methods. The popularity and construction of the charging pile are of great significance to promoting the development of electric vehicles and reducing the dependence on traditional fuel vehicles. In order to ensure the stable operation of the charging pile, a charging and discharging dynamic adjustment system is needed to assist the operation.

[0003] The existing charging and discharging dynamic adjustment system has poor self-adaptive performance, which causes the charging and discharging dynamic adjustment system to be unable to automatically adjust the charging and discharging state of the charging pile in a timely manner according to the power grid load during operation, thereby easily continuously increasing the load of the power grid, i.e., interfering with the low-voltage charging efficiency of the charging pile and increasing the power supply burden of the power grid at high voltage, and thus having certain use defects. SUMMARY

[0004] The present application aims to provide a charging pile bidirectional charging and discharging dynamic adjustment system self-adapting to power grid load to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solution: a charging pile bidirectional charging and discharging dynamic adjustment system self-adapting to power grid load, comprising: A data acquisition module is used to acquire real-time operation data of the power grid, such as voltage, current and power, and information of the working state of the charging pile, the battery state of the electric vehicle, such as state of charge (SOC), battery voltage, current and the charging demand of the user, etc. A data monitoring and analysis module is based on the collected historical data and real-time data, and predicts the future load change trend of the power grid, while automatically analyzing the relationship between the current power grid load and the charging pile and evaluating the influence degree of the charging pile on the power grid load. A load prediction and discrimination module automatically discriminates according to the real-time data analyzed by the data monitoring and analysis module during operation, and transmits the received information data to the corresponding control module according to the discrimination result. A charging control module is used to increase the charging power of the charging pile when the power grid load is low, and fully utilize the remaining power to efficiently charge the electric vehicle. A discharge control module, which is used to reduce the charging power of the charging pile from the grid during peak grid load, or even allow electric vehicles with discharge capabilities to discharge to the grid; The data integration and collection module is used to automatically record the grid load values ​​and the operating time intervals of the charging control module and the discharging control module in each time period of the day, so that the subsequent system can perform grid load analysis and prediction.

[0006] Furthermore, the power calculation formula of a single charging pile in the load prediction and judgment module is: Single pile = U × I × cosϕ Single pile: active power of a single charging pile (kW); : Rated voltage of the charging station (V, such as single-phase 220V or three-phase 380V); : Charging current (A, depends on the charging power level); ϕ: Power factor (usually 0.9~0.95).

[0007] Furthermore, the total load calculation formula of the power grid area in the load forecasting and judging module is: Total = , i×η×λ n: number of charging piles; η: simultaneity rate (the proportion of charging piles working simultaneously in the same period, generally 0.3~0.8), which reflects the time overlap of charging pile use (for example, the simultaneous charging rate in a residential area is higher at night); λ: load factor (the ratio of the actual power of the charging pile to the rated power, 0.2~1.0), which is related to the charging stage (for example, the load factor is high in the constant current charging stage and low in the trickle current stage).

[0008] Furthermore, the control module includes an instruction receiving unit, a charge and discharge control unit, a battery management unit and a monitoring management unit, and the battery management unit and the monitoring management unit interact in real time during the operation of the control module to ensure the safety of the vehicle during the charging and discharging process.

[0009] Furthermore, the battery management unit and the monitoring management unit monitor and manage the current flow power of the electric vehicle battery and the charging pile respectively. If the flowing current exceeds the carrying value of the electric vehicle battery, the power is automatically cut off and data is recorded so that subsequent staff can retrieve the data to find out the cause of the fault.

[0010] Furthermore, the data integration and collection module includes a data receiving unit, a folder creation unit, and a folder automatic organization unit, and the output end of the data receiving unit is connected to the input end of the folder creation unit, and the output end of the folder creation unit is connected to the input end of the folder automatic organization unit.

[0011] Furthermore, the folder creation unit includes a creation date, a creation name and a feature mark, so that the subsequent folder automatic sorting unit can quickly sort the files when it is running, and it is also convenient for staff to quickly retrieve and query based on the file information.

[0012] Furthermore, when the folder automatic sorting unit is running, it will automatically classify the folders into main folders named high negative pressure and low negative pressure according to the characteristic tags created by the folders (i.e., power grid load data and time period) to facilitate subsequent big data analysis.

[0013] The present invention provides a bidirectional charging and discharging dynamic adjustment system for charging piles that is adaptive to grid load, which has the following beneficial effects: The present invention cooperates with the charging control module and the discharging control module to enable the system to automatically perform two-way charging and discharging dynamic adjustment operation of the charging pile, thereby avoiding excessive impact of electric vehicle charging on the power grid, alleviating peak load pressure of the power grid, reducing power grid voltage fluctuation and frequency deviation, and improving the stability and reliability of the power grid. At the same time, it also realizes two-way energy interaction between electric vehicles and the power grid, charging when the power grid load is low and discharging when the power grid load is peak, improving the overall energy utilization efficiency of the power grid, and promoting the absorption of renewable energy. In addition, combined with dynamic electricity price policies, it guides users to charge during low electricity price periods and discharge during high electricity price periods, reducing users' charging costs, and also providing users with the opportunity to participate in power grid demand response and obtain economic benefits. The mutual cooperation of the battery management unit and the monitoring management unit can reasonably control the charging and discharging process, avoid battery overcharging, over-discharging, high current charging and discharging, and other situations that are detrimental to battery life, thereby extending the service life of electric vehicle batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Fig. 1 This is a schematic diagram of the system operation flow of a charging pile bidirectional charging and discharging dynamic adjustment system that is adaptive to grid load of the present invention; Fig. 2 This is a schematic diagram of the operation flow of the control module of a charging pile bidirectional charging and discharging dynamic adjustment system that is adaptive to grid load of the present invention; Fig. 3 This is a schematic diagram of the operation flow of the data integration and collection module of a charging pile bidirectional charging and discharging dynamic adjustment system that is adaptive to the grid load of the present invention. DETAILED DESCRIPTION

[0015] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0016] like Figs. 1-3 As shown, a bidirectional charging and discharging dynamic regulation system for charging piles that is adaptive to grid load includes: A data acquisition module is used to collect real-time operating data such as the voltage, current, and power of the power grid, as well as the working status of the charging pile, the battery status of the electric vehicle (such as the state of charge SOC, battery voltage, current, etc.), and the user's charging needs; A data monitoring and analysis module, which predicts future load trends of the power grid based on collected historical and real-time data, automatically analyzes the relationship between the current power grid load and the charging piles, and assesses the impact of the charging piles on the power grid load; The load forecasting and discrimination module automatically judges the load based on the real-time data analyzed by the data monitoring and analysis module during operation, and transmits the received information data to the corresponding control module according to the judgment result. The power calculation formula of a single charging pile in the load forecasting and discrimination module is: Single pile = U × I × cosϕ Single pile: active power of a single charging pile (kW); : Rated voltage of the charging station (V, such as single-phase 220V or three-phase 380V); : Charging current (A, depends on the charging power level); ϕ: Power factor (usually 0.9~0.95). The total load calculation formula for the power grid area in the load forecasting and judgment module is: Total = , i×η×λ n: number of charging piles; η: simultaneity rate (the proportion of charging piles operating simultaneously during the same period, generally 0.3-0.8), reflecting the time overlap of charging pile usage (e.g., a high simultaneity rate in residential areas at night); λ: load factor (the ratio of the actual power of the charging pile to the rated power, 0.2-1.0), related to the charging stage (e.g., a high load factor during constant current charging and a low load factor during trickle current charging). A charging control module is used to increase the charging power of the charging pile during low-peak grid load, making full use of the remaining power to efficiently charge the electric vehicle. The control module includes a command receiving unit, a charge and discharge control unit, a battery management unit, and a monitoring management unit. During operation, the battery management unit and the monitoring management unit interact in real time to ensure the safety of the vehicle during the charging and discharging process. The battery management unit and the monitoring management unit monitor and manage the current flow power of the electric vehicle battery and the charging pile respectively. If the flowing current exceeds the value of the electric vehicle battery, the power is automatically cut off and data is recorded so that subsequent staff can retrieve the data to identify the cause of the fault. The battery management unit and the monitoring management unit reasonably control the charging and discharging process to avoid overcharging, over-discharging, and high-current charging and discharging, which are detrimental to the battery life, thereby extending the service life of the electric vehicle battery; A discharge control module, which is used to reduce the charging power of the charging pile from the grid during peak grid load, or even allow electric vehicles with discharge capabilities to discharge to the grid; A data integration and collection module is used to automatically record the grid load values ​​and the operating time intervals of the charging control module and the discharging control module in each time period of the day, so that the subsequent system can perform grid load analysis and prediction. The data integration and collection module includes a data receiving unit, a folder creation unit, and a folder automatic sorting unit, and the output end of the data receiving unit is connected to the input end of the folder creation unit. The folder creation unit contains the creation date, creation name and feature mark, so that the subsequent folder automatic sorting unit can quickly sort it when it is running, and it is also convenient for staff to quickly retrieve and query according to the file information. The output end of the folder creation unit is connected to the input end of the folder automatic sorting unit. When the folder automatic sorting unit is running, it will automatically classify it into main folders named high negative pressure and low negative pressure according to the feature marks created by the folder (i.e., grid load data and time period) for subsequent big data analysis.

[0017] In summary, combined Figs. 1-3As shown, the working principle of the adaptive power grid load charging pile bidirectional charging and discharging dynamic regulation system is as follows: first, the data acquisition module is used to control various sensors, smart meters and other equipment, to collect real-time data such as voltage, current and power of the power grid, working state of the charging pile, battery state (such as state of charge SOC, battery voltage, current, etc.) of the electric vehicle and charging demand of the user, etc., then the data acquisition module automatically transmits the collected data information to the data monitoring and analysis module, then based on the collected real-time data and the historical data recorded by the system originally, the future load change trend of the power grid is predicted, and the current power grid load condition and the power grid load change trend are analyzed, then the monitoring and analysis data are transmitted to the load prediction and discrimination module, at this time, the current power grid load value is obtained by automatic calculation according to the algorithm designed in the module, then the value information is used for automatic discrimination and the discrimination instruction is sent to the corresponding regulation and control module; Finally, when the charging regulation and control module or the discharging regulation and control module receives the instruction, the charging or discharging operation is automatically performed, so as to achieve the purpose of automatic bidirectional charging and discharging dynamic regulation, and when the charging regulation and control module or the discharging regulation and control module is running, the data is automatically transmitted to the data integration and collection module, at this time, the data integration and collection module automatically creates a folder for the received data and automatically classifies the folder into the corresponding main folder according to the characteristic mark, so as to facilitate the historical data retrieval and the query of the staff during the subsequent system operation.

[0018] Embodiments of the present application are given for the purpose of example and description, and are not exhaustive or limiting of the present application. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are chosen and described in order to best explain the principles of the application and its practical application, and to enable others skilled in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Claims

1. A bidirectional charging and discharging dynamic adjustment system for charging piles that is adaptive to grid load, characterized in that: include: A data acquisition module is used to collect real-time operating data such as the voltage, current, and power of the power grid, as well as the working status of the charging pile, the battery status of the electric vehicle (such as the state of charge SOC, battery voltage, current, etc.), and the user's charging needs; A data monitoring and analysis module, which predicts future load trends of the power grid based on collected historical and real-time data, automatically analyzes the relationship between the current power grid load and the charging piles, and assesses the impact of the charging piles on the power grid load; A load forecasting and discrimination module, which automatically makes a judgment based on the real-time data analyzed by the data monitoring and analysis module during operation, and transmits the received information data to the corresponding control module according to the judgment result; A charging control module is used to increase the charging power of the charging pile during low-load periods of the power grid, making full use of the remaining power to efficiently charge the electric vehicle; A discharge control module, which is used to reduce the charging power of the charging pile from the grid during peak grid load, or even allow electric vehicles with discharge capabilities to discharge to the grid; The data integration and collection module is used to automatically record the grid load values ​​and the operating time intervals of the charging control module and the discharging control module in each time period of the day, so that the subsequent system can perform grid load analysis and prediction.

2. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 1 is characterized in that: The power calculation formula of a single charging pile in the load prediction and judgment module is: Single pile: active power of a single charging pile; : Rated voltage of charging pile; : charging current; ϕ: power factor.

3. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 1 is characterized in that: The total load calculation formula of the power grid area in the load forecasting and judgment module is: ,i×η×λ n: number of charging piles; η: Simultaneity rate, reflecting the temporal overlap of charging pile usage; λ: Load rate, related to the charging stage.

4. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 1 is characterized in that: The control module includes an instruction receiving unit, a charge and discharge control unit, a battery management unit and a monitoring management unit. During operation of the control module, the battery management unit and the monitoring management unit interact in real time to ensure the safety of the vehicle during the charging and discharging process.

5. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 4 is characterized in that: The battery management unit and monitoring management unit monitor and manage the current flow power of the electric vehicle battery and the charging pile respectively. If the flowing current exceeds the carrying value of the electric vehicle battery, the power will be automatically cut off and data will be recorded so that subsequent staff can retrieve the data to find out the cause of the fault.

6. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 5, which is adaptive to grid load, is characterized in that: The data integration and collection module includes a data receiving unit, a folder creation unit, and a folder automatic sorting unit, and the output end of the data receiving unit is connected to the input end of the folder creation unit, and the output end of the folder creation unit is connected to the input end of the folder automatic sorting unit.

7. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 6, which is adaptive to grid load, is characterized in that: The folder creation unit includes a creation date, a creation name and a feature mark, so that the subsequent folder automatic sorting unit can quickly sort the files when it is running, and it is also convenient for staff to quickly retrieve and query based on the file information.

8. The charging pile bidirectional charging and discharging dynamic adjustment system according to claim 6, characterized in that: When the folder automatic sorting unit is running, it will automatically classify the folders into main folders named high negative pressure and low negative pressure according to the characteristic tags created by the folders, so as to facilitate subsequent big data analysis.

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