Electric vehicle energy storage charging and discharging system, charging and discharging charging pile and charging and discharging method

Abstract

The invention discloses an electric vehicle energy storage charging and discharging system, a charging and discharging charging pile and a charging and discharging method, and the electric vehicle energy storage charging and discharging system comprises an EMS energy management system which is arranged in an electric vehicle and is used for monitoring, controlling and optimizing energy flow and energy consumption in the electric vehicle; the charging and discharging charging pile is internally provided with a V2G charging and discharging system connected with a power grid and is used for being connected with the electric vehicle to carry out charging and discharging operation in the electric vehicle; a moving driving module is arranged in the moving carrier, and the moving carrier is used for loading the charging and discharging charging pile to move to a designated position and loading and unloading the charging and discharging charging pile; and the charging and discharging charging pile is connected with the electric vehicle at a specified position and is used for connecting the EMS energy management system with the V2G charging and discharging system to carry out charging and discharging energy storage and regulation and control operation in the electric vehicle. By arranging the V2G charging and discharging system, balance and optimization of electric energy supply and electric energy demand between the power grid and the electric vehicle can be completed.

Description

Technical Field

[0001] The present invention relates to the field of charging pile charging technology, and in particular to an electric vehicle energy storage charging and discharging system, a charging and discharging pile, and a charging and discharging method. Background Art

[0002] With the rapid growth of the electric vehicle market, the demand for charging infrastructure is increasing. Traditional fixed charging piles are one of the most commonly used charging facilities. These charging piles are usually installed in fixed locations such as parking lots, commercial areas or residential areas, and provide power to electric vehicles through the power grid. At this stage, in order to meet the growing charging demand, many places have to deploy a large number of fixed charging piles to ensure sufficient charging point coverage.

[0003] Existing fixed charging pile systems usually require the deployment of multiple sets of charging piles to meet larger charging needs, where each charging pile is connected to the power grid and can independently charge one or more electric vehicles. Although this layout can ensure the availability of charging services, it also brings higher construction and operating costs; in addition, during peak hours, when multiple sets of charging piles work at the same time, it will cause a greater load on the power grid, which not only increases the transformer capacity requirements, but may also cause problems with power grid stability.

[0004] In addition, the existing fixed charging pile system has not fully utilized the vehicle-to-grid (V2G) technology. The V2G charging and discharging system uses the electric vehicle power battery as an energy storage device, and completes the balance and optimization of the power supply and power demand between the power grid and the electric vehicle through the local and remote EMS management system. However, the existing fixed charging pile system has failed to fully integrate these functions, resulting in low energy utilization efficiency and unable to give full play to the advantages of V2G technology.

[0005] To this end, the present application improves the EMS energy management system and V2G charging and discharging system of the prior art, and based on a rail-type mobile charging pile, proposes an electric vehicle energy storage charging and discharging system, a charging and discharging charging pile, and a charging and discharging method to solve the above-mentioned technical problems. Summary of the invention

[0006] The main purpose of the present invention is to provide an electric vehicle energy storage charging and discharging system, a charging and discharging charging pile and a charging and discharging method. Only a small number of charging piles are needed to meet more charging needs, the cost is low, and the power of a small number of charging piles charging at the same time is relatively small, which is friendly to the power grid. At the same time, by applying the improved V2G technology, the balance and optimization of power supply and power demand between the power grid and the electric vehicle can be achieved to solve the technical problems raised in the background technology.

[0007] The present invention adopts the following technical solutions to solve the above technical problems:

[0008] An electric vehicle energy storage charging and discharging system, comprising:

[0009] The EMS energy management system is installed inside the tram to monitor, control and optimize the energy flow and energy consumption inside the tram;

[0010] The charging and discharging charging pile is equipped with a V2G charging and discharging system connected to the power grid, which is used to connect to the tram to perform charging and discharging operations inside the tram;

[0011] A mobile vehicle is provided with a mobile driving module inside, which is used to load the charging and discharging pile path and move to the designated location and load and unload the charging and discharging pile;

[0012] Tracks are used to limit the movement of mobile vehicles along a specified path between preset areas;

[0013] The charging and discharging pile is connected to the tram at a designated location, and is used to connect the EMS energy management system with the V2G charging and discharging system to perform charging and discharging energy storage and regulation operations inside the tram.

[0014] Preferably, the EMS energy management system is internally provided with:

[0015] Vehicle energy storage module, used for storing charging energy;

[0016] Energy storage monitoring module, used to detect the amount of charging energy stored inside the vehicle energy storage module;

[0017] A management optimization module is used to provide an optimization plan for in-vehicle energy use based on the charging energy inventory value and vehicle status detected by the energy storage monitoring module;

[0018] The energy control module adjusts the adopted values ​​of various energy-using devices in the vehicle by the vehicle energy storage module based on the optimization scheme of the management optimization module.

[0019] Preferably, the V2G charging and discharging system is internally provided with:

[0020] The charging and discharging circuit includes a power regulating module, a power conversion module and a rectifier / inverter module which are connected to electricity in sequence. When the vehicle is in the charging and discharging state, the rectifier / inverter module is connected to the vehicle energy storage module based on the rectifier circuit and the inverter circuit, and the power regulating module is connected to the grid connection module;

[0021] A grid connection module, connected to an external smart grid, for receiving electricity from the smart grid;

[0022] The regulating circuit is connected to the grid connection module and the EMS energy management system, and is used to regulate the amount of current that the grid connection module obtains from the smart grid.

[0023] Preferably, the regulating circuit comprises:

[0024] The vehicle status acquisition module is connected to the energy storage monitoring module through a transmission signal, and is used to obtain the charging energy stored inside the vehicle energy storage module when the vehicle is in the charging and discharging state;

[0025] A power grid status acquisition module, used to obtain the external smart grid power connection status based on the power grid connection module;

[0026] The energy storage regulation module is used to provide grid connection optimization instructions based on the collected information of the vehicle status collection module and the grid status collection module, and send the grid connection optimization instructions to the grid connection module for execution.

[0027] Preferably, the specific process of the grid connection module executing the grid connection optimization instruction includes:

[0028] L1. Preset the current transformer rated capacity of the grid status acquisition module;

[0029] L2. When the load occupies less than 90% of the capacity, the grid connection module controls the power regulation module to charge the vehicle at full power and reduce the discharge cost to the vehicle owner, thereby reducing his desire to discharge.

[0030] L3. When the grid load accounts for more than 90% of the capacity, if there are still cars that need to start charging, the charging power of all charging piles will be reduced on average according to the preset indicators, and the power after reduction will be above 80%. At the same time, the discharge fee for car owners will be increased to attract them to discharge.

[0031] Preferably, the V2G charging and discharging system is further provided with an interface connection sensing module, which is connected to the grid connection module and is used to sense the charging and discharging state of the vehicle and control the grid connection module to connect to the smart grid;

[0032] The interface connection sensing module is connected to the mobile driving module. The interface connection sensing module senses the charging and discharging status of the vehicle and is used to drive a group of mobile driving modules inside the mobile vehicle to operate through external signals.

[0033] A charging and discharging charging pile, applied to any of the above-mentioned electric vehicle energy storage charging and discharging systems, comprising:

[0034] A charging pile body, wherein a V2G charging and discharging system as claimed in any one of claims 1 to 5 is arranged inside;

[0035] A charging cable, which is arranged on the charging pile body and is used to connect with the electric vehicle;

[0036] When the electric vehicle is connected to the charging pile body via a charging cable, the V2G charging and discharging system operates.

[0037] A charging and discharging method is performed based on any of the above-mentioned electric vehicle energy storage charging and discharging systems, and includes the following specific operating steps:

[0038] S1. After the tram moves to the designated location, the mobile vehicle is driven by an external signal to operate, and the mobile vehicle drives the charging and discharging charging piles to move along the track to the designated location for unloading, and the mobile vehicle returns along the track;

[0039] S2. After the charging and discharging pile is connected to the tram through a charging cable, the EMS energy management system is connected to the V2G charging and discharging system for operation, and the V2G charging and discharging system is connected to the smart grid and performs the charging and discharging operation of the tram and the charging and discharging regulation operation;

[0040] S3. After the electric charge inside the tram reaches a specified threshold, the V2G charging and discharging system sends a movement instruction to a mobile drive module of a group of mobile vehicles;

[0041] S4. After the mobile drive module receives the mobile command, if there are other external signals of trams in the area, it is determined that the charging and discharging charging pile in the charging area needs to continue charging and use, and the mobile drive module does not operate;

[0042] S5. If there is no external signal of other trams in this area, it is determined that the charging location is fully charged and the mobile drive module is operated to drive the mobile vehicle to move along the track to this location. After the mobile vehicle is reloaded with the charging and discharging piles, the mobile drive module is operated to drive the mobile vehicle to move along the track back to the original area.

[0043] It can be seen from the above technical solutions that the present invention provides an electric vehicle energy storage charging and discharging system, a charging and discharging charging pile and a charging and discharging method. Compared with the prior art, the present invention has the following advantages:

[0044] 1. The present invention sets up a V2G charging and discharging system and connects the V2G charging and discharging system with the EMS energy management system. Therefore, the energy storage regulation module is used to collect the internal power of the vehicle and the power connected to the power grid during the charging and discharging process of the tram, so as to balance and optimize the power supply and power demand between the power grid and the tram, and can serve as a core node to achieve the access of the smart grid and the supplement of user-side energy storage.

[0045] 2. The present invention sets up an EMS energy management system and connects the V2G charging and discharging system with the EMS energy management system. Therefore, during the charging and discharging process of the electric vehicle, the power inside the vehicle energy storage module can be collected and monitored to realize the regulation of other device systems inside the vehicle body, thereby optimizing the charging and discharging process of the electric vehicle and improving the charging and discharging efficiency of the electric vehicle.

[0046] 3. The present invention sets an interface connection sensing module in the V2G charging and discharging system, and utilizes the connection between the interface connection sensing module and the grid connection module. After the charging amount of the electric vehicle reaches a specified threshold, the energy storage adjustment module can send an adjustment scheme to the grid connection module to further obtain corresponding information, thereby driving the mobile vehicle to trigger in time, which can save the overall operation time of the system, improve the adaptability of the system during the charging and discharging operation of multiple vehicles, and facilitate use.

[0047] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become easy to understand through the following description. Of course, it is not necessary to achieve all of the advantages described above simultaneously for any product implementing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0049] Figure 1 It is a schematic diagram of the overall system framework of the system of the present invention;

[0050] Figure 2 It is a schematic diagram of the overall process of the method of the present invention;

[0051] Figure 3 Schematic diagram of the moving process of the mobile carrier of the present invention Figure 1 ;

[0052] Figure 4 Schematic diagram of the moving process of the mobile carrier of the present invention Figure 2 . DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0054] In the embodiment, see Figures 1 to 4 .

[0055] like Figure 1 An electric vehicle energy storage charging and discharging system proposed in an embodiment of the present invention includes:

[0056] (1) EMS energy management system, which is installed inside the tram and is used to monitor, control and optimize the energy flow and energy consumption inside the tram.

[0057] Specifically, the EMS energy management system is internally configured with:

[0058] Vehicle energy storage module, used for storing charging energy;

[0059] Energy storage monitoring module, used to detect the amount of charging energy stored inside the vehicle energy storage module;

[0060] A management optimization module is used to provide an optimization plan for in-vehicle energy use based on the charging energy inventory value and vehicle status detected by the energy storage monitoring module;

[0061] The energy control module adjusts the adopted values ​​of various energy-using devices in the vehicle by the vehicle energy storage module based on the optimization scheme of the management optimization module.

[0062] Here is an optimization solution, including:

[0063] According to the preset scheme of the tram user, the importance weight i is assigned to each component inside the vehicle, i∈[1,10];

[0064] When the power of the vehicle energy storage module is decreasing, the power usage is blocked in order of importance weights from low to high until the power inside the vehicle energy storage module increases;

[0065] When the vehicle energy storage module is in the process of increasing power, non-essential power-consuming components with importance weights less than 3 are turned off in sequence according to the power growth rate in the vehicle energy storage module, from low to high, until the power growth inside the vehicle energy storage module reaches more than 150% of the original growth rate.

[0066] (2) A charging and discharging charging pile, which is equipped with a V2G charging and discharging system connected to the power grid and is used to connect to the tram to perform charging and discharging operations inside the tram;

[0067] The charging and discharging piles are connected to the tram at designated locations and are used to connect the EMS energy management system with the V2G charging and discharging system to perform charging and discharging energy storage and regulation operations inside the tram.

[0068] Specifically, the V2G charging and discharging system is internally configured with:

[0069] The charging and discharging circuit includes a power regulating module, a power conversion module and a rectifier / inverter module which are connected to electricity in sequence. When the vehicle is in the charging and discharging state, the rectifier / inverter module is connected to the vehicle energy storage module based on the rectifier circuit and the inverter circuit, and the power regulating module is connected to the grid connection module.

[0070] A grid connection module, connected to an external smart grid, for receiving electricity from the smart grid;

[0071] The interface is connected to the sensing module, and the interface is connected to the sensing module and the grid connection module, and is used to sense the charging and discharging state of the vehicle and control the grid connection module to connect with the smart grid;

[0072] The regulating circuit is connected to the grid connection module and the EMS energy management system, and is used to regulate the amount of current connection obtained by the grid connection module from the smart grid. It specifically includes a vehicle state acquisition module, a grid state acquisition module and an energy storage regulation module, wherein: the vehicle state acquisition module is connected to the energy storage monitoring module through a transmission signal, and is used to obtain the charging energy stored inside the vehicle energy storage module under the vehicle charging and discharging state; the grid state acquisition module is used to obtain the external smart grid connection state based on the grid connection module; the energy storage regulation module is used to provide a grid connection optimization instruction based on the collected information of the vehicle state acquisition module and the grid state acquisition module, and send the grid connection optimization instruction to the grid connection module for execution, wherein the specific process of the grid connection module executing the grid connection optimization instruction includes:

[0073] L1. Preset the current transformer rated capacity of the grid status acquisition module;

[0074] L2. When the capacity is sufficient (the load accounts for less than 90% of the capacity), the grid connection module controls the power regulation module to charge the vehicle at full power and reduce the discharge cost to the vehicle owner, thereby reducing his desire to discharge.

[0075] L3. When the grid load is close to full power (load accounts for more than 90% of capacity), if there are still cars that need to start charging, the charging power of all charging piles will be reduced on average according to the preset indicators, and the power after reduction will be more than 80%. At the same time, the discharge fee for car owners will be increased to attract them to discharge;

[0076] In a specific embodiment, taking the experiment in City A as an example, the feasibility of the scheme is further evaluated by using the tram user satisfaction of the grid connection optimization instruction:

[0077] For the charging satisfaction evaluation (1-5) in the test area (commercial area), the traffic volume of electric vehicles at the entrance and exit of the designated charging area is counted as follows:

[0078] Transformer rated capacity: 8MVA (megavolt-ampere) Average value of charging satisfaction rating Users in Area A (Tram flow: 0-1000 vehicles / day) 4.35 Users in Area B (Tram flow: 1,000 to 3,000 vehicles / day) 4.56 Users in Area C (tram traffic: more than 3,000 vehicles / day) 4.43

[0079] At the same time, regarding the charging efficiency in the test area (commercial area), 78% of tram users reported that the charging efficiency (including queuing time) has improved, effectively reducing the ineffective charging time.

[0080] It should also be noted that, during the process of executing the grid connection optimization instruction, the grid connection module can also comprehensively and intelligently adjust the specific amount according to the reservation order situation of the platform, the big data expectation algorithm, the state of the charging car, the peak and valley time periods of the grid, etc., including the charging fee, the discharge price, the order price of the order taker of the reservation platform, etc. For the charging consumption amount in the test area (commercial area), the preset charging fee a0, the discharge price b0, and the order price of the order taker of the reservation platform, the specific amount ρ of the adjustment plan is:

[0081] ρρ=ρ1+ρ2+ρ3

[0082]

[0083] Where a is the normal charging cost in the area, b is the normal discharging price in the area, and c is the normal charging cost in the area. i is the order acceptance price of the i-th order acceptor among the n order acceptors in the area, and c is the regular order acceptance price of the order acceptor on the booking platform;

[0084] In summary, by setting up the V2G charging and discharging system and the EMS energy management system, and connecting the V2G charging and discharging system with the EMS energy management system, therefore:

[0085] The V2G charging and discharging system uses an energy storage regulation module to collect the internal power of the vehicle and the power connected to the grid during the charging and discharging process of the electric vehicle. It can balance and optimize the power supply and power demand between the power grid and the electric vehicle, and can easily access the photovoltaic system, bringing application value in peak and valley power consumption, distribution network capacity expansion, user-side energy storage, battery monitoring, etc., and can serve as a core node to achieve access to the smart grid and supplement user-side energy storage;

[0086] The EMS energy management system is connected internally and can collect and monitor the power inside the vehicle energy storage module during the charging and discharging process of the electric vehicle, realize the regulation of other device systems inside the vehicle body, thereby optimizing the charging and discharging process of the electric vehicle and improving the charging and discharging efficiency of the electric vehicle.

[0087] (3) Mobile vehicles and tracks, including:

[0088] A mobile driving module is provided inside the mobile vehicle, which is used to load the charging and discharging pile path and move to the designated location and load and unload the charging and discharging pile;

[0089] Tracks are used to limit the movement of mobile vehicles along a specified path between preset areas;

[0090] In addition, the interface connection sensing module is connected to the mobile driving module. The interface connection sensing module senses the charging and discharging status of the vehicle and is used to drive a group of mobile driving modules inside the mobile vehicle to operate through external signals.

[0091] On the other hand, the present invention also discloses a charging and discharging pile, which is applied to any of the above-mentioned electric vehicle energy storage charging and discharging systems, comprising:

[0092] A charging pile body, wherein a V2G charging and discharging system according to any one of claims 1 to 5 is arranged inside;

[0093] A charging cable, which is arranged on the charging pile body and is used to connect with the electric vehicle;

[0094] When the electric vehicle and the charging pile are connected via a charging cable, the V2G charging and discharging system operates.

[0095] On the other hand, the present invention also discloses a charging and discharging method, which is executed based on any of the above-mentioned electric vehicle energy storage charging and discharging systems, referring to Figure 2 , Figure 3 and Figure 4 , including the following specific steps:

[0096] S1. After the tram moves to the designated location, the mobile vehicle is driven by an external signal to operate, and the mobile vehicle drives the charging and discharging charging piles to move along the track to the designated location for unloading, and the mobile vehicle returns along the track;

[0097] S2. After the charging and discharging pile is connected to the tram through the charging cable, the EMS energy management system is connected to the V2G charging and discharging system for operation, and the V2G charging and discharging system is connected to the smart grid and performs the charging and discharging operations and charging and discharging regulation operations of the tram;

[0098] S3. After the electric charge inside the tram reaches a specified threshold (generally set to 95%), the V2G charging and discharging system sends a movement instruction to a group of mobile drive modules of mobile vehicles;

[0099] S4. After the mobile drive module receives the mobile command, if there are other external signals of trams in the area, it is determined that the charging and discharging charging pile in the charging area needs to continue charging and use, and the mobile drive module does not operate;

[0100] S5. If there is no external signal of other trams in this area, it is determined that the charging location is fully charged and the mobile drive module is operated to drive the mobile vehicle to move along the track to this location. After the mobile vehicle is reloaded with the charging and discharging piles, the mobile drive module is operated to drive the mobile vehicle to move along the track back to the original area.

[0101] In summary, during use, this method sets an interface connection sensing module in the V2G charging and discharging system, and utilizes the connection between the interface connection sensing module and the grid connection module. After the charging amount of the electric vehicle reaches a specified threshold, the energy storage regulation module can send an adjustment plan to the grid connection module to further obtain corresponding information, thereby driving the mobile vehicle to trigger in time, which can save the overall operation time of the system, improve the adaptability of the system during charging and discharging operation of multiple vehicles, and facilitate use.

[0102] It is understandable that the system provided by the embodiment of the present invention corresponds to the method provided by the embodiment of the present invention, and the explanation, examples and beneficial effects of the relevant contents can refer to the corresponding parts in the above method.

[0103] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that contains one or more available media integrated. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive So lid State Dis sk (SSD)), etc.

[0104] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0105] In addition, it should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0106] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, in the embodiments of the present invention, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A tram energy storage charging and discharging system, characterized in that: include: The EMS energy management system is installed inside the tram to monitor, control and optimize the energy flow and energy consumption inside the tram; The charging and discharging charging pile is equipped with a V2G charging and discharging system connected to the power grid, which is used to connect to the tram to perform charging and discharging operations inside the tram; A mobile vehicle is provided with a mobile driving module inside, which is used to load the charging and discharging pile path and move to the designated location and load and unload the charging and discharging pile; Tracks are used to limit the movement of mobile vehicles along a specified path between preset areas; The charging and discharging pile is connected to the tram at a designated location, and is used to connect the EMS energy management system with the V2G charging and discharging system to perform charging and discharging energy storage and regulation operations inside the tram.

2. The electric vehicle energy storage charging and discharging system according to claim 1, characterized in that: The EMS energy management system is internally provided with: Vehicle energy storage module, used for storing charging energy; Energy storage monitoring module, used to detect the amount of charging energy stored inside the vehicle energy storage module; A management optimization module is used to provide an optimization plan for in-vehicle energy use based on the charging energy inventory value and vehicle status detected by the energy storage monitoring module; The energy control module adjusts the adopted values ​​of various energy-using devices in the vehicle by the vehicle energy storage module based on the optimization scheme of the management optimization module.

3. The electric vehicle energy storage charging and discharging system according to claim 2, characterized in that: The V2G charging and discharging system is internally provided with: The charging and discharging circuit includes a power regulating module, a power conversion module and a rectifier / inverter module which are connected to electricity in sequence. When the vehicle is in the charging and discharging state, the rectifier / inverter module is connected to the vehicle energy storage module based on the rectifier circuit and the inverter circuit, and the power regulating module is connected to the grid connection module; A grid connection module, connected to an external smart grid, for receiving electricity from the smart grid; The regulating circuit is connected to the grid connection module and the EMS energy management system, and is used to regulate the amount of current that the grid connection module obtains from the smart grid.

4. The electric vehicle energy storage charging and discharging system according to claim 3, characterized in that: The regulating circuit comprises: The vehicle status acquisition module is connected to the energy storage monitoring module through a transmission signal, and is used to obtain the charging energy stored inside the vehicle energy storage module when the vehicle is in the charging and discharging state; A power grid status acquisition module, used to obtain the external smart grid power connection status based on the power grid connection module; The energy storage regulation module is used to provide grid connection optimization instructions based on the collected information of the vehicle status collection module and the grid status collection module, and send the grid connection optimization instructions to the grid connection module for execution.

5. The electric vehicle energy storage charging and discharging system according to claim 4, characterized in that: The specific process of the grid connection module executing the grid connection optimization instruction includes: L1. Preset the current transformer rated capacity of the grid status acquisition module; L2. When the load occupies less than 90% of the capacity, the grid connection module controls the power regulation module to charge the vehicle at full power and reduce the discharge cost to the vehicle owner, thereby reducing his desire to discharge. L3. When the grid load accounts for more than 90% of the capacity, if there are still cars that need to start charging, the charging power of all charging piles will be reduced on average according to the preset indicators, and the power after reduction will be above 80%. At the same time, the discharge fee for car owners will be increased to attract them to discharge.

6. The electric vehicle energy storage charging and discharging system according to claim 4, characterized in that: The V2G charging and discharging system is also provided with an interface connection sensing module, which is connected to the grid connection module and is used to sense the charging and discharging status of the vehicle and control the grid connection module to connect to the smart grid; The interface connection sensing module is connected to the mobile driving module. The interface connection sensing module senses the charging and discharging status of the vehicle and is used to drive a group of mobile driving modules inside the mobile vehicle to operate through external signals.

7. A charging and discharging pile, applied to the electric vehicle energy storage charging and discharging system according to any one of claims 1 to 6, characterized in that: include: The main body of the charging pile is equipped with a V2G charging and discharging system; A charging cable, which is arranged on the charging pile body and is used to connect with the electric vehicle; When the electric vehicle is connected to the charging pile body via a charging cable, the V2G charging and discharging system operates.

8. A charging and discharging method, performed based on the electric vehicle energy storage charging and discharging system according to any one of claims 1 to 5, characterized in that: The specific steps are as follows: S1. After the tram moves to the designated location, the mobile vehicle is driven by an external signal to operate, and the mobile vehicle drives the charging and discharging charging piles to move along the track to the designated location for unloading, and the mobile vehicle returns along the track; S2. After the charging and discharging pile is connected to the tram through a charging cable, the EMS energy management system is connected to the V2G charging and discharging system for operation, and the V2G charging and discharging system is connected to the smart grid and performs the charging and discharging operation of the tram and the charging and discharging regulation operation; S3. After the electric charge inside the tram reaches a specified threshold, the V2G charging and discharging system sends a movement instruction to a mobile drive module of a group of mobile vehicles; S4. After the mobile drive module receives the mobile command, if there are other external signals of trams in the area, it is determined that the charging and discharging charging pile in the charging area needs to continue charging and use, and the mobile drive module does not operate; S5. If there is no external signal of other trams in this area, it is determined that the charging location is fully charged and the mobile drive module is operated to drive the mobile vehicle to move along the track to this location. After the mobile vehicle is reloaded with the charging and discharging piles, the mobile drive module is operated to drive the mobile vehicle to move along the track back to the original area.

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