Bidirectional feedback electric vehicle virtual synchronous charging and discharging system and method

Abstract

The invention discloses a bidirectional feedback electric vehicle virtual synchronous charging and discharging system and method, and relates to the technical field of virtual synchronous motors, and the method comprises the steps: monitoring the state parameters of a vehicle end battery, and transmitting the state parameters to a virtual synchronous control module and a bidirectional feedback module; transmitting the state parameters of the battery to a power grid end; the power grid end optimizes the scheduling and load distribution strategy of the power grid according to the state parameters of the battery; the operation state of the power grid end is monitored in real time; according to the monitoring result, a corresponding control signal is calculated and generated, and is sent to the bidirectional feedback module; and after receiving the control signal of the power grid, the electric vehicle adjusts charging and discharging behaviors. According to the bidirectional feedback virtual synchronous charging and discharging system for the electric vehicle, the interactivity and the flexibility between the electric vehicle and the power grid are remarkably enhanced, the real-time response to the power grid in the charging and discharging process of the electric vehicle is realized, and the load management of the power grid is optimized. Peak regulation and valley filling can be effectively carried out, the operation cost of the power grid is reduced, and the stability of the power grid is enhanced.

Description

Technical Field

[0001] This invention relates to the field of virtual synchronous motor technology, specifically to a bidirectional feedback virtual synchronous charging and discharging system and method for electric vehicles. Background Technology

[0002] With the increasing prevalence of electric vehicles (EVs), their impact on the power grid is becoming increasingly significant. Traditional EV charging methods are mostly passive, lacking interaction with the power grid and failing to meet the grid's peak-shaving and valley-filling needs. Traditional charging methods are often unidirectional, meaning the grid supplies power to the EV, while the EV cannot respond to the grid. Under this approach, EV charging behavior is often random, potentially concentrating during peak grid load periods, exacerbating grid load pressure, while charging demand decreases during off-peak periods, failing to effectively utilize the grid's low-load resources. This unidirectional energy flow limits energy efficiency and system flexibility.

[0003] Therefore, this field needs to develop a bidirectional feedback virtual synchronous charge / discharge machine for electric vehicles to solve existing problems. Summary of the Invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by this invention is to address the lack of interactivity and flexibility of traditional electric vehicle charging methods in grid peak shaving and valley filling.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bidirectional feedback virtual synchronous charging and discharging system for electric vehicles, comprising the following steps:

[0007] The system includes an electric vehicle-side functional module, a communication module, and a power grid-side functional module. The electric vehicle-side functional module includes a battery management system, a virtual synchronization control module, and a bidirectional feedback module. The communication module is responsible for bidirectional data communication between the electric vehicle-side functional module and the power grid-side functional module. The power grid-side functional module includes a power grid monitoring module, a power grid control module, and a data receiving and feedback module.

[0008] As a preferred embodiment of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles described in this invention, the battery management system is responsible for monitoring the state parameters of the vehicle-side battery in real time and feeding back the battery state parameters to the virtual synchronous control module and the bidirectional feedback module to optimize the charging and discharging strategy.

[0009] The status parameters include the battery's state of charge and charging / discharging power.

[0010] The virtual synchronization control module is responsible for simulating the behavior of a synchronous generator and adjusting the power output or charging power of the electric vehicle according to the frequency and voltage fluctuations of the power grid.

[0011] The bidirectional feedback module is responsible for transmitting the state parameters of the vehicle's battery to the power grid, and at the same time receiving control signals from the power grid to adjust the charging and discharging behavior.

[0012] In a preferred embodiment of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles described in this invention, the power grid monitoring module is responsible for real-time monitoring of the operating status of the power grid.

[0013] The operating status of the power grid includes the power grid frequency, voltage, and load.

[0014] The power grid control module sends control signals to the electric vehicle based on the monitoring results from the power grid.

[0015] The data receiving and feedback module is responsible for receiving and analyzing the status parameters of the vehicle to optimize the power grid scheduling and load distribution.

[0016] Another objective of this invention is to provide a bidirectional feedback virtual synchronous charging and discharging method for electric vehicles, which can monitor grid demand in real time and adjust the charging and discharging behavior of electric vehicles, thus solving the problem that existing unidirectional charging systems exacerbate load pressure during peak grid periods and waste resources during off-peak periods.

[0017] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bidirectional feedback virtual synchronous charging and discharging method for electric vehicles, comprising:

[0018] The battery status parameters of the vehicle are monitored by sensors and transmitted to the virtual synchronization control module and the bidirectional feedback module. The bidirectional feedback module transmits the battery status parameters to the power grid through the communication module. The power grid optimizes the grid scheduling and load distribution strategy based on the battery status parameters and monitors the operation status of the power grid in real time. Based on the monitoring results, the power grid calculates and generates corresponding control signals and sends them to the bidirectional feedback module. After receiving the control signals from the power grid, the electric vehicle adjusts its charging and discharging behavior.

[0019] As a preferred embodiment of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles described in this invention, the transmission to the power grid via the communication module includes the communication module encrypting the battery's state parameters, and employing an error detection and correction mechanism during the encryption process.

[0020] As a preferred embodiment of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles described in this invention, the optimized grid scheduling and load allocation strategy includes: constructing an optimization model with battery state parameters as input, calculating the optimal power scheduling strategy with the goal of minimizing total cost, expressed as follows:

[0021]

[0022]

[0023]

[0024]

[0025]

[0026] Where C represents the total cost, Indicates energy cost, Indicates operating costs, This represents the cost of the penalty, where c and d represent the charging power and discharging power, respectively. , These represent the charging and discharging times, respectively. , These represent the unit prices for purchasing and selling electricity, respectively, and k represents a coefficient for battery cycle life and maintenance costs. , These represent the battery state before and after the operation, respectively. denoted by the penalty factor for exceeding the load capacity, p represents the predicted maximum load, and z represents the maximum load capacity of the power grid.

[0027] In a preferred embodiment of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles described in this invention, the generation of corresponding control signals includes: if the grid frequency is lower than the voltage frequency standard value, indicating that grid demand exceeds supply, an increase in discharge signal is issued; if the grid frequency is higher than the voltage frequency standard value, indicating that grid supply exceeds demand, an increase in charging signal is issued; if the grid voltage is higher than the normal grid voltage value, an increase in charging signal is issued; if the grid voltage is lower than the normal grid voltage value, an increase in discharge signal is issued; if the actual load of the grid exceeds a preset peak threshold, a control signal is applied to instruct the electric vehicle to increase discharge; if the actual load of the grid is lower than a preset low peak threshold, a control signal is applied to instruct the electric vehicle to increase charging. The corresponding control signals are expressed as follows:

[0028]

[0029]

[0030]

[0031] in, Indicates frequency control signal, Indicates voltage control signal, Indicates the load control signal. This indicates an increase in discharge. This indicates that charging has been increased. Indicates the standard value of voltage frequency. This indicates the normal value of the power grid voltage. This indicates the preset peak threshold. This indicates the preset low peak threshold.

[0032] As a preferred embodiment of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles described in this invention, the adjustment of charging and discharging behavior includes: acquiring the battery information and travel plan of the electric vehicle; when sending a control signal to increase discharge to the electric vehicle, if the battery charge is lower than the minimum discharge threshold, the discharge signal is temporarily ignored; after the battery charge allows discharge, a discharge command is issued; if the battery charge is within a safe range, the discharge signal is allowed to be executed; and the discharge behavior is stopped when the battery charge drops to the minimum discharge threshold.

[0033] When a control signal to increase discharge is sent to an electric vehicle, the electric vehicle is not allowed to execute the discharge signal if it has a travel plan.

[0034] A computer device includes a memory and a processor, the memory storing a computer program, the processor executing the computer program to implement the steps of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described above.

[0035] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described above.

[0036] The beneficial effects of this invention are as follows: The bidirectional feedback virtual synchronous charging and discharging system for electric vehicles significantly enhances the interaction and flexibility between electric vehicles and the power grid, enabling real-time responses from electric vehicles to the power grid during charging and discharging, thus optimizing power grid load management. This invention not only effectively reduces peak shaving and valley filling, lowering power grid operating costs, but also enhances power grid stability, especially during periods of high demand or low capacity. By allowing electric vehicles to discharge when needed and charge when there is a power surplus, this invention provides a solution for effectively utilizing renewable energy and improving energy distribution, which is environmentally friendly and economically beneficial. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is an overall framework diagram of a bidirectional feedback virtual synchronous charging and discharging system for electric vehicles provided in the first embodiment of the present invention.

[0039] Figure 2 The overall flowchart of the bidirectional feedback virtual synchronous charging and discharging method for electric vehicles provided in the second embodiment of the present invention is shown. Detailed Implementation

[0040] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0041] Example 1, referring to Figure 1 As one embodiment of the present invention, a bidirectional feedback virtual synchronous charging and discharging system for electric vehicles is provided, comprising:

[0042] Electric vehicle-side functional modules, communication modules, and power grid-side functional modules.

[0043] The functional modules for electric vehicles include a battery management system, a virtual synchronization control module, and a two-way feedback module.

[0044] The communication module is responsible for bidirectional data communication between the functional modules on the electric vehicle side and the functional modules on the power grid side.

[0045] The power grid-side functional modules include a power grid monitoring module, a power grid control module, and a data receiving and feedback module.

[0046] The battery management system is responsible for monitoring the battery status parameters in the vehicle in real time and feeding them back to the virtual synchronization control module and the bidirectional feedback module to optimize the charging and discharging strategy.

[0047] Status parameters include battery state of charge and charging / discharging power.

[0048] The virtual synchronization control module is responsible for simulating the behavior of a synchronous generator and adjusting the power output or charging power of the electric vehicle according to the frequency and voltage fluctuations of the power grid.

[0049] The bidirectional feedback module is responsible for transmitting the battery status parameters from the vehicle to the power grid, while also receiving control signals from the power grid to adjust the charging and discharging behavior.

[0050] The power grid monitoring module is responsible for monitoring the operating status of the power grid in real time.

[0051] The operating status of the power grid includes the grid frequency, voltage, and load.

[0052] The power grid control module sends control signals to the electric vehicle based on the monitoring results from the power grid.

[0053] The data receiving and feedback module is responsible for receiving and analyzing the status parameters of the vehicles to optimize the power grid scheduling and load distribution.

[0054] Example 2, refer to Figure 2 As one embodiment of the present invention, a method for a bidirectional feedback virtual synchronous charging and discharging system for electric vehicles is provided, comprising:

[0055] S1: Monitors the status parameters of the vehicle-side battery through sensors and transmits them to the virtual synchronization control module and the bidirectional feedback module.

[0056] S2: The bidirectional feedback module transmits the battery's status parameters to the power grid via the communication module.

[0057] The data transmitted to the power grid via the communication module includes encrypting the battery's state parameters, and employing error detection and correction mechanisms during the encryption process.

[0058] S3: The grid side optimizes the grid scheduling and load distribution strategy based on the battery status parameters;

[0059] Optimizing power grid dispatch and load allocation strategies involves constructing an optimization model with battery state parameters as input, minimizing total cost as the objective, and calculating the optimal power dispatch strategy, expressed as follows:

[0060]

[0061]

[0062]

[0063]

[0064]

[0065] Where C represents the total cost, Indicates energy cost, Indicates operating costs, This represents the cost of the penalty, where c and d represent the charging power and discharging power, respectively. , These represent the charging and discharging times, respectively. , These represent the unit prices for purchasing and selling electricity, respectively, and k represents a coefficient for battery cycle life and maintenance costs. , These represent the battery state before and after the operation, respectively. denoted by the penalty factor for exceeding the load capacity, p represents the predicted maximum load, and z represents the maximum load capacity of the power grid.

[0066] S4: Real-time monitoring of the power grid's operational status.

[0067] S5: Based on the monitoring results, calculate and generate the corresponding control signals and send them to the bidirectional feedback module.

[0068] The generation of corresponding control signals includes: if the grid frequency is lower than the voltage frequency standard value, indicating that grid demand exceeds supply, an increase discharge signal is issued; if the grid frequency is higher than the voltage frequency standard value, indicating that grid supply exceeds demand, an increase charging signal is issued; if the grid voltage is higher than the normal grid voltage value, an increase charging signal is issued; if the grid voltage is lower than the normal grid voltage value, an increase discharge signal is issued; if the actual grid load exceeds a preset peak threshold, a control signal is applied to instruct the electric vehicle to increase discharge; if the actual grid load is lower than a preset low peak threshold, a control signal is applied to instruct the electric vehicle to increase charging. The corresponding control signals are represented as follows:

[0069]

[0070]

[0071]

[0072] in, Indicates frequency control signal, Indicates voltage control signal, Indicates the load control signal. This indicates an increase in discharge. This indicates that charging has been increased. Indicates the standard value of voltage frequency. This indicates the normal value of the power grid voltage. This indicates the preset peak threshold. This indicates the preset low peak threshold.

[0073] S6: After receiving the control signal from the power grid, the electric vehicle adjusts its charging and discharging behavior.

[0074] Adjusting charging and discharging behavior includes obtaining battery information and travel plans of the electric vehicle. When a control signal to increase discharge is sent to the electric vehicle, if the battery charge is below the minimum discharge threshold, the discharge signal is temporarily ignored. Once the battery charge allows discharge, a discharge command is issued. If the battery charge is within a safe range, the discharge signal is allowed to be executed. The discharge behavior stops when the battery charge drops to the minimum discharge threshold.

[0075] When a control signal to increase discharge is sent to an electric vehicle, the electric vehicle is not allowed to execute the discharge signal if it has a travel plan.

[0076] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0077] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0078] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0079] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0080] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A bidirectional feedback virtual synchronous charging and discharging system for electric vehicles, characterized in that, include: Electric vehicle-side functional modules, communication modules, and power grid-side functional modules; The electric vehicle-side functional modules include a battery management system, a virtual synchronization control module, and a two-way feedback module. The communication module is responsible for bidirectional data communication between the electric vehicle-side functional module and the power grid-side functional module. The power grid-side functional modules include a power grid monitoring module, a power grid control module, and a data receiving and feedback module.

2. The bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described in claim 1, characterized in that: The battery management system is responsible for monitoring the status parameters of the vehicle battery in real time and feeding back the battery status parameters to the virtual synchronization control module and the bidirectional feedback module to optimize the charging and discharging strategy. The status parameters include the battery's state of charge and charging / discharging power; The virtual synchronization control module is responsible for simulating the behavior of a synchronous generator and adjusting the power output or charging power of the electric vehicle according to the frequency and voltage fluctuations of the power grid. The bidirectional feedback module is responsible for transmitting the state parameters of the vehicle's battery to the power grid, and at the same time receiving control signals from the power grid to adjust the charging and discharging behavior.

3. The bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described in claim 2, characterized in that: The power grid monitoring module is responsible for monitoring the operating status of the power grid in real time. The operating status of the power grid includes the power grid frequency, voltage, and load; The power grid control module sends control signals to the electric vehicle based on the monitoring results from the power grid. The data receiving and feedback module is responsible for receiving and analyzing the status parameters of the vehicle to optimize the power grid scheduling and load distribution.

4. The method of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described in claims 1-3, characterized in that, include: The status parameters of the vehicle-side battery are monitored by sensors and transmitted to the virtual synchronization control module and the two-way feedback module. The bidirectional feedback module transmits the battery's status parameters to the power grid via the communication module; The power grid optimizes its scheduling and load distribution strategies based on the battery's state parameters. Real-time monitoring of the power grid's operational status; Based on the monitoring results, the corresponding control signals are calculated and generated, and then sent to the bidirectional feedback module. After receiving control signals from the power grid, electric vehicles adjust their charging and discharging behavior.

5. The bidirectional feedback virtual synchronous charging and discharging method for electric vehicles as described in claim 4, characterized in that: The transmission to the power grid via the communication module includes encrypting the battery's state parameters, and employing an error detection and correction mechanism during the encryption process.

6. The bidirectional feedback virtual synchronous charging and discharging method for electric vehicles as described in claim 5, characterized in that: The optimized power grid scheduling and load allocation strategy includes constructing an optimization model with battery state parameters as input, minimizing total cost as the objective, and calculating the optimal power scheduling strategy, expressed as follows: Where C represents the total cost, Indicates energy cost, Indicates operating costs, This represents the cost of the penalty, where c and d represent the charging power and discharging power, respectively. , These represent the charging and discharging times, respectively. , These represent the unit prices for purchasing and selling electricity, respectively, and k represents a coefficient for battery cycle life and maintenance costs. , These represent the battery state before and after the operation, respectively. denoted by the penalty factor for exceeding the load capacity, p represents the predicted maximum load, and z represents the maximum load capacity of the power grid.

7. The bidirectional feedback virtual synchronous charging and discharging method for electric vehicles as described in claim 6, characterized in that: The generation of corresponding control signals includes: if the grid frequency is lower than the voltage frequency standard value, indicating that grid demand exceeds supply, a signal to increase discharge is issued; if the grid frequency is higher than the voltage frequency standard value, indicating that grid supply exceeds demand, a signal to increase charging is issued; if the grid voltage is higher than the normal grid voltage value, a signal to increase charging is issued; if the grid voltage is lower than the normal grid voltage value, a signal to increase discharge is issued; if the actual grid load exceeds a preset peak threshold, a control signal is applied to instruct the electric vehicle to increase discharge; if the actual grid load is lower than a preset low peak threshold, a control signal is applied to instruct the electric vehicle to increase charging. The corresponding control signals are expressed as follows: in, Indicates frequency control signal, Indicates voltage control signal, Indicates the load control signal. This indicates an increase in discharge. This indicates that charging has been increased. Indicates the standard value of voltage frequency. This indicates the normal value of the power grid voltage. This indicates the preset peak threshold. This indicates the preset low peak threshold.

8. A virtual synchronous charging and discharging method for electric vehicles using bidirectional feedback as described in claim 7, characterized in that: The adjustment of charging and discharging behavior includes obtaining the battery information and travel plan of the electric vehicle. When a control signal to increase discharge is sent to the electric vehicle, if the battery charge is lower than the minimum discharge threshold, the discharge signal is temporarily ignored. After the battery charge allows discharge, a discharge command is issued. If the battery charge is within a safe range, the discharge signal is allowed to be executed. When the battery charge drops to the minimum discharge threshold, the discharge behavior is stopped. When a control signal to increase discharge is sent to an electric vehicle, the electric vehicle is not allowed to execute the discharge signal if it has a travel plan.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described in any one of claims 1 to 3.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the bidirectional feedback virtual synchronous charging and discharging system for electric vehicles as described in any one of claims 1 to 3.

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