Flexible intelligent overcharge station system based on integration of source, network, load and storage

Abstract

The invention relates to the technical field of electric vehicle charging, and provides a flexible intelligent over-charging station system based on source-grid-load-storage integration, which comprises a V2G-based flexible charging and discharging module, the module realizes dynamic distribution of charging power and V2G power through intelligent scheduling and control based on a charging mode of a charging pile, the charging pile can be integrated with a station-level monitoring system, and the station-level monitoring system is connected with the V2G-based flexible charging and discharging module. Therefore, centralized control is carried out on charging equipment, power distribution equipment and auxiliary equipment, and simultaneous efficient charging and V2G of a plurality of electric vehicles are realized. According to the invention, the charging power can be flexibly distributed, the charging power can be dynamically adjusted according to the actual demand of the electric vehicle, the charging efficiency is improved, the waiting time is reduced, the waiting time does not exceed 15min, and the energy loss can be reduced and the overall energy efficiency can be improved by adopting the high-efficiency charging equipment. The overall efficiency is not lower than 85%, the charging load is automatically adjusted, the power grid pressure is relieved, peak load shifting is achieved, and efficient, stable and safe operation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and specifically to a flexible intelligent supercharging station system based on source-grid-load-storage integration. Background Art

[0002] In recent years, with the popularization of electric vehicles and the promotion of clean energy policies, the charging pile industry has experienced significant growth. As a key link connecting electric vehicles to the power grid, the importance of charging piles is self-evident. The types of charging piles range from slow charging to fast DC charging to super charging, and charging technology continues to improve to meet the charging needs of electric vehicle users in different scenarios. In particular, the penetration rate of electric vehicles has reached more than 30% to 50% in the past two years. Not only has the demand for charging increased sharply, but in order to alleviate the anxiety of charging mileage, the charging power of newly launched electric vehicles has become larger and larger, from the early 60kW and 120kW fast charging to 180kW, 240kW, 320kW, 480kW, 600kW, and the charging time has been reduced from 1 hour to 10min. However, the rapid development of super charging piles has also brought a series of challenges, especially the large-scale construction of super charging stations may have an impact on the stability of the power grid, mainly reflected in the following aspects:

[0003] 1. Load fluctuation: The disorderly charging of a large number of electric vehicles will lead to an irregular increase in the load on the power grid, especially during peak hours, which may aggravate the peak-to-valley difference of the power grid and pose a threat to the stable operation of the power grid.

[0004] 2. Unbalanced transformer load rate: Disorderly charging makes the load distribution of the power grid uneven, which may cause the transformers in some areas to be in a high-load state for a long time, while the transformers in other areas are under low load. This not only reduces the operating efficiency of the power grid, but may also cause problems such as transformer overheating and damage.

[0005] 3. Heavy overload risk: In local distribution networks, when the penetration rate of electric vehicles exceeds a certain threshold and the simultaneous charging rate is high, the distribution transformers will face the risk of heavy load or even overload, affecting the safety and reliability of the power grid.

[0006] 4. Deterioration in power supply voltage quality: Simultaneous charging in a supercharging station may cause local voltage drops, affecting the normal power consumption of other power users.

[0007] 5. Large impact on the power grid and harmonic pollution: High-power fast charging in supercharging stations will have a large impact on the power grid, affecting the power safety and equipment safety of other users, and the harmonics generated will pollute the power grid. With the popularization of supercharging technology and the increase in supercharging models, the change of high-power current will increase the fluctuation amplitude of the power grid, causing greater impact on the power grid and more severe load fluctuations. Summary of the invention

[0008] In view of the shortcomings of the prior art, the present invention provides a flexible intelligent supercharging station system based on the integration of source, grid, load and storage, which realizes balanced control, flexible regulation and friendly interaction among the power grid, distributed photovoltaic, energy storage and charging piles, which not only enhances the flexibility of power consumption of charging stations and reduces the instantaneous impact of large-scale access of new energy vehicles on the power grid, but also reduces the construction cost of supercharging stations through the integrated construction of photovoltaic, storage and charging and intelligent regulation strategies, while improving the operational economy of supercharging stations, forming a safe, efficient and flexible supercharging station energy.

[0009] To achieve the above objectives, the present invention is implemented through the following technical solutions: a flexible intelligent supercharging station system based on source-grid-load-storage integration, including:

[0010] Flexible charging and discharging module based on V2G. This module is based on the charging mode of the charging pile and realizes the dynamic allocation of charging power and V2G power through intelligent scheduling and control. The charging pile can integrate the station-level monitoring system to centrally control the charging equipment, power distribution equipment and auxiliary equipment, so as to realize efficient charging and V2G of multiple electric vehicles at the same time.

[0011] The source-grid-load-storage integrated module uses the power supply side as the starting point of energy supply, converts renewable energy into electrical energy and transmits it to the grid side. Through the two-way interactive channel established between the grid side, the load side and the energy storage side, the charging load state of electric vehicles can be adjusted according to the operation state of the grid and its own actual needs, guiding users to use electricity at appropriate times. The energy storage side releases and stores the stored electrical energy under the change of grid load, and also provides electrical energy support for the load side.

[0012] Smart energy management module; used for real-time monitoring, analysis and optimal scheduling of each link of the charging station, and automatically adjusts the charging strategy and equipment operation status according to the power grid status, user demand and renewable energy output.

[0013] Preferably, the power supply side converts natural energy into electrical energy through photovoltaic panels and wind turbines, and uses advanced intelligent scheduling systems and control algorithms to achieve coordinated scheduling of renewable energy with power grids, loads and energy storage equipment.

[0014] Preferably, the grid side introduces smart grid technology to perform real-time monitoring, remote control and adaptive adjustment of supercharging stations, and optimizes the power distribution structure of supercharging stations to improve the adaptability of supercharging stations to new energy access and power grids. The smart grid technology includes sensors, communications and control systems.

[0015] Preferably, the load side adjusts the charging load status of the electric vehicle through an intelligent load management unit according to the actual operation of the power grid and the charging station, and establishes a user demand response mechanism to enable users to interact with the status of the power grid load in real time.

[0016] Preferably, the charging load state is a peak state and a valley state, and the charging load is automatically adjusted when the grid load is at a peak, and the electric energy is fully utilized for charging when the grid load is at a valley.

[0017] Preferably, the energy storage side uses high-efficiency energy storage equipment to store excess electrical energy, and through the interaction between the energy storage system and the power grid, a two-way flow of electrical energy is achieved, which can not only discharge to relieve pressure when the power grid load is peak, but also charge and store energy when the power grid is at a low point.

[0018] The method for using the flexible intelligent supercharging station based on the integration of source, grid, load and storage includes the following steps:

[0019] Step 1: Use photovoltaic panels and wind turbines on the power supply side to collect natural energy and convert it into electrical energy. Through the intelligent dispatching system and control algorithm, according to the real-time status of the power grid, load and energy storage equipment, forecast and allocate renewable energy power generation to ensure efficient and stable energy conversion and preliminary coordinated dispatch, and at the same time transmit the generated electrical energy to the power grid side;

[0020] Step 2: Use sensors, communications and control systems to monitor the components of the supercharging station in real time, obtain parameter information such as voltage, current, and power, and transmit the data to the control center for analysis and processing. Through remote control and adaptive adjustment functions, optimize the power transmission and distribution path;

[0021] Step 3: The intelligent load management unit on the load side determines whether the current power grid is in a peak or valley state based on the real-time load state of the power grid and the usage of each charging device in the charging station, combined with the user demand response mechanism;

[0022] When in peak state, the charging power of electric vehicles is automatically adjusted to reduce the overall charging load and give priority to key equipment or emergency charging needs;

[0023] When the electricity consumption is at a low point, the charging power is increased to fully utilize the low electricity price and excess electricity to encourage users to charge. The charging plan information is pushed to the user terminal to guide the user's electricity consumption.

[0024] Preferably, the average waiting time of the supercharging station is less than 15 minutes.

[0025] Preferably, the power conversion efficiency of the supercharging station is not less than 85%.

[0026] The present invention provides a flexible intelligent supercharging station system based on source-grid-load-storage integration. It has the following beneficial effects:

[0027] 1. The present invention has the ability to flexibly allocate charging power, can dynamically adjust the charging power according to the actual needs of electric vehicles, improve charging efficiency and reduce waiting time, the waiting time does not exceed 15 minutes, and adopts high-efficiency charging equipment to reduce energy loss and improve overall energy efficiency. The overall efficiency is not less than 85%.

[0028] 2. The present invention automatically adjusts the charging load when the grid load is at its peak, relieves the pressure on the grid, realizes peak shaving and valley filling, reduces the fluctuation and impact on the grid caused by electric vehicle charging, can automatically adjust the charging strategy and equipment operating status, realizes efficient, stable and safe operation, and meets the response time control within 10s. DETAILED DESCRIPTION

[0029] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] Example:

[0031] As one aspect of the present invention, the present invention provides a flexible intelligent supercharging station system based on source-grid-load-storage integration, including:

[0032] Flexible charging and discharging module based on V2G. This module is based on the charging mode of the charging pile and realizes the dynamic allocation of charging power and V2G power through intelligent scheduling and control. The charging pile can integrate the station-level monitoring system to centrally control the charging equipment, power distribution equipment and auxiliary equipment, so as to realize efficient charging and V2G of multiple electric vehicles at the same time.

[0033] The source-grid-load-storage integrated module uses the power supply side as the starting point of energy supply, converts renewable energy into electrical energy and transmits it to the grid side. Through the two-way interactive channel established between the grid side, the load side and the energy storage side, the charging load state of electric vehicles can be adjusted according to the operation state of the grid and its own actual needs, guiding users to use electricity at appropriate times. The energy storage side releases and stores the stored electrical energy under the change of grid load, and also provides electrical energy support for the load side.

[0034] Power supply side: Convert natural energy into electrical energy through photovoltaic panels and wind turbines to increase the proportion of green energy use, and use advanced intelligent scheduling systems and control algorithms to achieve coordinated scheduling of renewable energy with power grids, loads and energy storage equipment to ensure efficient use of energy.

[0035] On the grid side: smart grid technology is introduced, including advanced sensors, communications and control systems, to conduct real-time monitoring, remote control and adaptive adjustment of supercharging stations, improve the efficiency of power transmission and distribution, optimize the power distribution structure of supercharging stations, enhance the adaptability of supercharging stations to new energy access and the power grid, and ensure the stable operation of supercharging stations.

[0036] Load side: Through the intelligent load management unit, the charging load status of electric vehicles is adjusted according to the actual operation of the power grid and charging stations to achieve peak shaving and valley filling, improve the overall efficiency of the power system and reduce the waiting time. The waiting time does not exceed 15 minutes, and establish a user demand response mechanism to enable users to interact with the status of the power grid load in real time.

[0037] Energy storage side: Use batteries and supercapacitors to store excess electrical energy. High-efficiency charging equipment can reduce energy loss and improve overall energy efficiency. The overall efficiency is not less than 85%, and it is released to charge electric vehicles when needed, improving the stability and reliability of the system and reducing the fluctuations and impacts on the power grid caused by electric vehicle charging. The impact is reduced to less than 50% and the power change rate does not exceed 50% / min. Through the interaction between the energy storage system and the power grid, the two-way flow of electrical energy is achieved, which can not only discharge to relieve pressure when the power grid is at peak load, but also charge and store energy when the power grid is at low point.

[0038] Smart energy management module: used for real-time monitoring, analysis and optimal scheduling of all aspects of the charging station, automatically adjusting the charging strategy and equipment operating status according to the grid status, user demand and renewable energy output, and ensuring the response time is controlled within 10s.

[0039] A flexible intelligent supercharging station system based on source-grid-load-storage integration, as another aspect of the present invention, proposes a method for using a flexible intelligent supercharging station based on source-grid-load-storage integration, comprising the following steps:

[0040] Step 1: Use photovoltaic panels and wind turbines on the power supply side to collect natural energy and convert it into electrical energy. Through the intelligent dispatching system and control algorithm, according to the real-time status of the power grid, load and energy storage equipment, forecast and allocate renewable energy power generation to ensure efficient and stable energy conversion and preliminary coordinated dispatch, and at the same time transmit the generated electrical energy to the power grid side;

[0041] Step 2: Use sensors, communications and control systems to monitor the components of the supercharging station in real time, obtain parameter information such as voltage, current, and power, and transmit the data to the control center for analysis and processing. Through remote control and adaptive adjustment functions, optimize the power transmission and distribution path, ensure the stable operation of the supercharging station distribution structure, improve the adaptability to new energy access and the power grid, and establish an efficient two-way information and energy interaction link with the load side and the energy storage side;

[0042] Step 3: The intelligent load management unit on the load side determines whether the current power grid is in a peak or valley state based on the real-time load state of the power grid and the usage of each charging device in the charging station, combined with the user demand response mechanism;

[0043] When in peak state, the charging power of electric vehicles is automatically adjusted to reduce the overall charging load and give priority to key equipment or emergency charging needs;

[0044] When the power supply is in a low-peak state, the charging power is increased to fully utilize the advantages of low-peak electricity prices and excess electricity, encourage users to charge, and push charging plan information to user terminals to guide users to use electricity at appropriate times, thereby achieving real-time interaction with users on the power grid load status and the goal of peak shaving and valley filling.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A flexible intelligent supercharging station system based on source-grid-load-storage integration, characterized by: include: Flexible charging and discharging module based on V2G. This module is based on the charging mode of the charging pile and realizes the dynamic allocation of charging power and V2G power through intelligent scheduling and control. The charging pile can integrate the station-level monitoring system to centrally control the charging equipment, power distribution equipment and auxiliary equipment, so as to realize efficient charging and V2G of multiple electric vehicles at the same time. The source-grid-load-storage integrated module uses the power supply side as the starting point of energy supply, converts renewable energy into electrical energy and transmits it to the grid side. Through the two-way interactive channel established between the grid side, the load side and the energy storage side, the charging load state of electric vehicles can be adjusted according to the operation state of the grid and its own actual needs, guiding users to use electricity at appropriate times. The energy storage side releases and stores the stored electrical energy under the change of grid load, and also provides electrical energy support for the load side. Smart energy management module; It is used for real-time monitoring, analysis and optimal scheduling of each link of the charging station, and automatically adjusts the charging strategy and equipment operating status according to the grid status, user demand and renewable energy output.

2. The flexible intelligent supercharging station system based on source-grid-load-storage integration according to claim 1 is characterized in that: The power supply side converts natural energy into electrical energy through photovoltaic panels and wind turbines, and uses advanced intelligent scheduling systems and control algorithms to achieve coordinated scheduling of renewable energy with power grids, loads and energy storage equipment.

3. The flexible intelligent supercharging station system based on source-grid-load-storage integration according to claim 1 is characterized in that: The grid side introduces smart grid technology to conduct real-time monitoring, remote control and adaptive adjustment of supercharging stations, optimize the power distribution structure of supercharging stations, and improve the adaptability of supercharging stations to new energy access and power grids. The smart grid technology includes sensors, communications and control systems.

4. The flexible intelligent supercharging station system based on source-grid-load-storage integration according to claim 1 is characterized in that: The load side adjusts the charging load status of the electric vehicle through the intelligent load management unit according to the actual operation of the power grid and the charging station, and establishes a user demand response mechanism to enable users to interact with the status of the power grid load in real time.

5. The flexible intelligent supercharging station system based on source-grid-load-storage integration according to claim 4 is characterized in that: The charging load state is divided into two types: peak and valley. The charging load is automatically adjusted when the grid load is peak, and the electric energy is fully utilized for charging when the grid load is valley.

6. The flexible intelligent supercharging station system based on source-grid-load-storage integration according to claim 1 is characterized in that: The energy storage side uses high-efficiency energy storage equipment to store excess electrical energy, and through the interaction between the energy storage system and the power grid, a two-way flow of electrical energy is achieved. It can discharge to relieve pressure when the power grid load is peak, and can also charge and store energy when the power grid is at a low point.

7. A method for using a flexible intelligent supercharging station based on source-grid-load-storage integration, using a flexible intelligent supercharging station system based on source-grid-load-storage integration as described in any one of claims 1-6, characterized in that: The following steps are involved: Step 1: Use photovoltaic panels and wind turbines on the power supply side to collect natural energy and convert it into electrical energy. Through the intelligent dispatching system and control algorithm, according to the real-time status of the power grid, load and energy storage equipment, forecast and allocate renewable energy power generation to ensure efficient and stable energy conversion and preliminary coordinated dispatch, and at the same time transmit the generated electrical energy to the power grid side; Step 2: Use sensors, communications and control systems to monitor the components of the supercharging station in real time, obtain parameter information such as voltage, current, and power, and transmit the data to the control center for analysis and processing. Through remote control and adaptive adjustment functions, optimize the power transmission and distribution path; Step 3: The intelligent load management unit on the load side determines whether the current power grid is in a peak or valley state based on the real-time load state of the power grid and the usage of each charging device in the charging station, combined with the user demand response mechanism; When in peak state, the charging power of electric vehicles is automatically adjusted to reduce the overall charging load and give priority to key equipment or emergency charging needs; When the electricity consumption is at a low point, the charging power is increased to fully utilize the low electricity price and excess electricity to encourage users to charge. The charging plan information is pushed to the user terminal to guide the user's electricity consumption.

8. The method for using the flexible intelligent supercharging station based on source-grid-load-storage integration according to claim 7 is characterized in that: The average waiting time at the supercharging station is less than 15 minutes.

9. The method for using the flexible intelligent supercharging station based on source-grid-load-storage integration according to claim 7 is characterized in that: The power conversion efficiency of the supercharging station is not less than 85%.