Network construction type energy storage BMS protection method and device, electronic equipment and storage medium

Abstract

The invention provides a network construction type energy storage BMS protection method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining a model identifier of a battery cell in a BMS, and determining a cell MAP table through the model identifier; obtaining the temperature and the SOC value in the battery compartment through the BMS, and determining the executable maximum charging and discharging current and the maximum power according to the temperature in the compartment, the SOC value and the battery cell MAP table; obtaining fault information and an overload state of the battery compartment in a historical time period, and executing charging and discharging overload or rated power operation processing on the battery in the battery compartment according to the fault information and the overload state in the historical time period; and when overload charging and discharging are carried out on the battery, protection processing is carried out according to the fault degree of the battery cell. The method has the beneficial effect that charging and discharging protection is carried out in time according to the working condition of the network-forming type energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a protection method, device, electronic equipment and storage medium for a grid-type energy storage BMS. Background Art

[0002] With the increasing attention paid to renewable energy and the continuous advancement of technology around the world, the installed capacity and power generation of new energy (such as wind power, photovoltaics, etc.) continue to increase. However, the volatility and intermittency of renewable energy power generation pose challenges to the stability of the power grid. In order to meet this challenge, the power system needs more flexible and reliable energy storage technology to support the stable operation of the power grid. In areas with high penetration of new energy and weak power grids, the stability and security issues of the power grid are particularly prominent. Traditional power grid control methods often rely on the inertial support and frequency and voltage regulation capabilities of large synchronous generators. However, as the proportion of renewable energy power generation continues to increase, the number of power electronic equipment in the power grid increases, resulting in reduced inertia and damping of the power grid, which is prone to voltage fluctuations and frequency instability.

[0003] Grid-type energy storage technology is a control technology for power electronic equipment, which aims to maintain the internal potential phasor constant or nearly constant. Since the grid-type energy storage system has two working modes, grid-type and grid-following, the traditional BMS protection method of the grid-following energy storage system, if the grid-following threshold is used, will not be able to meet the overload requirements of the grid-type energy storage system. When the system is overloaded, the BMS will think that the system is currently in an abnormal condition and protect the system, and send a prohibition charge and discharge instruction to the energy storage converter (PCS), and then cut off the contactor to interrupt the grid condition, causing the system to shut down and be unable to operate. If the relevant protection threshold is released, the system will not be able to protect the system in time when the grid is not allowed. Summary of the invention

[0004] The main purpose of the embodiments of the present invention is to provide a grid-type energy storage BMS protection method, device, electronic equipment and storage medium to perform timely charging and discharging protection according to the working conditions of the grid-type energy storage system.

[0005] One aspect of the present invention provides a grid-type energy storage BMS protection method, comprising:

[0006] Get the model identification of the battery cell in the BMS, and determine the cell MAP table based on the model identification;

[0007] The BMS obtains the temperature and SOC value of the battery compartment, and determines the maximum charge and discharge current and maximum power that can be executed based on the temperature, SOC value and battery cell MAP table.

[0008] Obtaining the fault information and overload status of the battery compartment in the historical time period, and performing charge and discharge overload or rated power operation processing on the batteries in the battery compartment according to the fault information and overload status in the historical time period;

[0009] When the battery is overloaded and charged or discharged, protection processing is performed according to the degree of battery cell failure.

[0010] According to the grid-type energy storage BMS protection method, the temperature and SOC value of the battery compartment are obtained through the BMS, and the executable maximum charge and discharge current and maximum power are determined according to the temperature, SOC value and battery cell MAP table, including:

[0011] The battery compartment is collected through BMS to obtain the temperature and SOC value inside the compartment;

[0012] According to the temperature in the compartment and the SOC value, the executable maximum charge / discharge current and the maximum power are determined from the battery cell MAP table.

[0013] According to the grid-type energy storage BMS protection method, the maximum charge and discharge current and the maximum power are calculated by the formula:

[0014]

[0015] P max =I max V Alarm N v

[0016] Among them, I max is the maximum charge and discharge current, P max is the maximum power, C r is the rated capacity of the battery cell, R THA is the rated operating ratio, V r is the rated voltage of the battery cell, V Alarm is the low voltage warning voltage of the battery cell, R over is the overload ratio, N v is the number of cluster voltages.

[0017] According to the grid-type energy storage BMS protection method, the executable maximum charge and discharge current and maximum power are determined from the battery cell MAP table by a sequential table lookup method.

[0018] According to the grid-type energy storage BMS protection method, the fault information and overload status of the battery compartment in the historical time period are obtained, and the battery in the battery compartment is charged and discharged according to the fault information and overload status in the historical time period. Overload or rated power operation processing is performed, including:

[0019] If the historical time period is less than the preset time, the battery in the battery compartment is made to perform rated power operation processing;

[0020] If the historical time period is greater than or equal to the preset time, the battery in the battery compartment is made to perform charge and discharge overload processing according to the maximum charge and discharge current and the maximum power.

[0021] According to the grid-type energy storage BMS protection method, when the battery is overloaded and charged or discharged, protection processing is performed according to the degree of failure of the battery cell, including:

[0022] Detect the battery when it is charged and discharged overloaded according to the maximum charge and discharge current and the maximum power to determine the degree of fault, where the degree of fault includes slight fault, moderate fault and severe fault;

[0023] If it is a minor fault, the battery output power will be modified to the rated power; if it is a moderate fault, the grid-type energy storage system will be prohibited from charging and discharging; if it is a serious fault, the contactor of the grid-type energy storage system will be cut off, and the dry contact will be output to the energy storage inverter to shut down.

[0024] According to the grid-type energy storage BMS protection method, the degree of fault is determined by the voltage, current, temperature, internal resistance and charge and discharge efficiency of the battery.

[0025] Another aspect of an embodiment of the present invention provides a grid-type energy storage BMS protection device, including:

[0026] The first module is used to obtain the model identification of the battery cell in the BMS and determine the battery cell MAP table according to the model identification;

[0027] The second module is used to obtain the temperature and SOC value of the battery compartment through the BMS, and determine the maximum charge and discharge current and maximum power that can be executed according to the temperature, SOC value and battery cell MAP table;

[0028] The third module is used to obtain the fault information and overload status of the battery compartment in the historical time period, and perform charge and discharge overload or rated power operation processing on the battery in the battery compartment according to the fault information and overload status in the historical time period;

[0029] The fourth module is used to perform protection processing according to the degree of failure of the battery cell when the battery is overloaded and discharged.

[0030] Another aspect of an embodiment of the present invention provides an electronic device, including a processor and a memory;

[0031] The memory is used to store programs;

[0032] The processor executes the program to implement the method described above.

[0033] The embodiment of the present invention also discloses a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. A processor of a computer device can read the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the method described above.

[0034] The beneficial effects of the present invention are as follows: by adjusting the allowed output power in real time through the cell MAP table, the grid construction demand can be responded to in a timely manner; the current under the overload condition is calculated, the maximum possible charge and discharge current is predicted, and the system is protected without affecting the overload condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0036] Figure 1 It is a schematic diagram of the protection process of the grid-type energy storage BMS according to an embodiment of the present invention.

[0037] Figure 2 Schematic diagram of a grid-type energy storage BMS protection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0038] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. In the subsequent description, the use of suffixes such as "module", "component" or "unit" used to represent elements is only for the purpose of facilitating the description of the present invention, and has no specific meaning in itself. Therefore, "module", "component" or "unit" can be used in a mixed manner. "First", "second" and the like are only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the order of the indicated technical features. In this subsequent description, the continuous numbering of the method steps is for the convenience of review and understanding. In combination with the overall technical solution of the present invention and the logical relationship between the various steps, adjusting the implementation order between the steps will not affect the technical effect achieved by the technical solution of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0039] refer to Figure 1 , Figure 1 Schematic diagram of the protection process of the grid-type energy storage BMS according to an embodiment of the present invention. It includes but is not limited to steps S100 to S400:

[0040] S100, obtaining a model identification of a battery cell in a BMS, and determining a cell MAP table according to the model identification. In some embodiments, a cell signal cell MAP table shown in reference representation

[0041] Table 1 MAP table of a certain type of battery

[0042]

[0043] Among them, the reference temperature is t0, and the reference SOC is soc0.

[0044] In some embodiments, the model identification of the battery cell is the battery cell model.

[0045] S200, obtaining the internal temperature and SOC value of the battery compartment through the BMS, and determining the executable maximum charge and discharge current and maximum power according to the internal temperature, SOC value and battery cell MAP table.

[0046] In some embodiments, the battery compartment is monitored by the BMS to obtain the compartment temperature and SOC value; based on the compartment temperature and SOC value, the executable maximum charge and discharge current and maximum power are determined from the battery cell MAP table.

[0047] In some embodiments, the maximum charge and discharge current and the maximum power are calculated by the formula:

[0048]

[0049] P max =I max V Alarm N v

[0050] Among them, I max is the maximum charge and discharge current, P max is the maximum power, C r is the rated capacity of the battery cell, R THA is the rated operating ratio, V r is the rated voltage of the battery cell, V Alarm is the low voltage warning voltage of the battery cell, R over is the overload ratio, N v is the number of cluster voltages.

[0051] In some embodiments, the executable maximum charge and discharge current and maximum power are determined by a sequential table lookup method, where starting from one end of the battery cell MAP table, the keyword of each element is checked one by one until the target element is found or all battery cell MAP tables are traversed.

[0052] S300, acquiring the fault information and overload status of the battery compartment in a historical time period, and performing charge and discharge overload or rated power operation processing on the battery in the battery compartment according to the fault information and overload status in the historical time period.

[0053] In some embodiments, if the historical time period is less than the preset time, the battery in the battery compartment is caused to perform rated power operation processing; if the historical time period is greater than or equal to the preset time, the battery in the battery compartment is caused to perform charge and discharge overload processing according to the maximum charge and discharge current and maximum power.

[0054] S400, when overload charging and discharging is performed on the battery, protection processing is performed according to the degree of failure of the battery cell.

[0055] In some embodiments, the battery is tested when performing charge and discharge overload processing according to the maximum charge and discharge current and the maximum power to determine the degree of fault, where the fault degree includes minor fault, moderate fault and severe fault; if it is a minor fault, the battery output power is modified to the rated power; if it is a moderate fault, the grid-type energy storage system is prohibited from charging and discharging; if it is a severe fault, the contactor of the grid-type energy storage system is cut off, and the dry contact is output to the energy storage inverter to shut down.

[0056] In some embodiments, the degree of fault is determined by the voltage, current, temperature, internal resistance and charge and discharge efficiency of the battery, for example, whether the voltage fluctuation range is still within the normal range. Other parameters are determined in a similar manner.

[0057] Figure 2 Schematic diagram of a grid-type energy storage BMS protection device according to an embodiment of the present invention. The device includes a first module 210 , a second module 220 , a third module 230 and a fourth module 240 .

[0058] Among them, the first module is used to obtain the model identification of the battery cell in the BMS, and determine the battery cell MAP table through the model identification; the second module is used to obtain the internal temperature and SOC value of the battery compartment through the BMS, and determine the executable maximum charge and discharge current and maximum power according to the internal temperature, SOC value and battery cell MAP table; the third module is used to obtain the fault information and overload status of the battery compartment in the historical time period, and perform charge and discharge overload or rated power operation processing on the battery in the battery compartment according to the fault information and overload status in the historical time period; the fourth module is used to perform protection processing according to the degree of fault of the battery cell when overload charging and discharging is performed on the battery.

[0059] Exemplarily, with the cooperation of the first module, the second module, the third module and the fourth module in the device, the embodiment device can implement any of the aforementioned grid-type energy storage BMS protection methods, that is, obtaining the model identification of the battery cell in the BMS, and determining the cell MAP table through the model identification; obtaining the temperature and SOC value of the battery compartment through the BMS, and determining the executable maximum charge and discharge current and maximum power according to the temperature, SOC value and cell MAP table; obtaining the fault information and overload status of the battery compartment in the historical time period, and performing charge and discharge overload or rated power operation processing on the battery in the battery compartment according to the fault information and overload status of the historical time period; when performing overload charge and discharge on the battery, performing protection processing according to the degree of fault of the cell. The beneficial effects of the present invention are: adjusting the allowed output power in real time through the cell MAP table can respond to the grid construction needs in a timely manner; calculating the current under the overload condition, predicting the maximum possible charge and discharge current, and protecting the system without affecting the overload condition.

[0060] An embodiment of the present invention further provides an electronic device, the electronic device comprising a processor and a memory;

[0061] The memory stores a program;

[0062] The processor executes the program to execute the aforementioned grid-type energy storage BMS protection method; the electronic device has the function of carrying and running the software system for grid-type energy storage BMS protection provided by the embodiment of the present invention, for example, a personal computer, a minicomputer, a main frame, a workstation, a network or distributed computing environment, a separate or integrated computer platform, or communicates with a charged particle tool or other imaging device, etc.

[0063] An embodiment of the present invention further provides a computer-readable storage medium, wherein the storage medium stores a program, and the program is executed by a processor to implement the grid-type energy storage BMS protection method as described above.

[0064] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0065] The embodiment of the present invention also discloses a computer program product or a computer program, which includes a computer instruction stored in a computer-readable storage medium. The processor of the computer device can read the computer instruction from the computer-readable storage medium, and the processor executes the computer instruction, so that the computer device executes the aforementioned grid-type energy storage BMS protection method.

[0066] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features described may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in separate physical devices or software modules. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions, and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0067] If the functions are implemented in the form of 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 the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0068] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0069] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0070] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0071] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0072] Although the 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 claims and their equivalents.

[0073] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the described embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A grid-type energy storage BMS protection method, characterized in that: include: Get the model identification of the battery cell in the BMS, and determine the cell MAP table based on the model identification; The BMS obtains the temperature and SOC value of the battery compartment, and determines the maximum charge and discharge current and maximum power that can be executed based on the temperature, SOC value and battery cell MAP table. Obtaining the fault information and overload status of the battery compartment in the historical time period, and performing charge and discharge overload or rated power operation processing on the batteries in the battery compartment according to the fault information and overload status in the historical time period; When the battery is overloaded and charged or discharged, protection processing is performed according to the degree of battery cell failure.

2. The grid-type energy storage BMS protection method according to claim 1 is characterized in that: The method of obtaining the temperature and SOC value of the battery compartment through the BMS, and determining the executable maximum charge and discharge current and maximum power according to the temperature, SOC value and battery cell MAP table, includes: The battery compartment is collected through BMS to obtain the temperature and SOC value inside the compartment; According to the temperature in the compartment and the SOC value, the executable maximum charge / discharge current and the maximum power are determined from the battery cell MAP table.

3. The grid-type energy storage BMS protection method according to claim 2 is characterized in that: The maximum charge and discharge current and the maximum power are calculated by the formula: P max =I max V Alarm N v Among them, I max is the maximum charge and discharge current, P max is the maximum power, C r is the rated capacity of the battery cell, R THA is the rated operating ratio, V r is the rated voltage of the battery cell, V Alarm is the low voltage warning voltage of the battery cell, R over is the overload ratio, N v is the number of cluster voltages.

4. The grid-type energy storage BMS protection method according to claim 2 is characterized in that: The maximum charge and discharge current and the maximum power that can be executed are determined from the battery cell MAP table by a sequential table lookup method.

5. The grid-type energy storage BMS protection method according to claim 1 is characterized in that: The acquiring of the fault information and overload status of the battery compartment in the historical time period, and performing charge and discharge overload or rated power operation processing on the battery in the battery compartment according to the fault information and overload status in the historical time period, includes: If the historical time period is less than the preset time, the battery in the battery compartment is made to perform rated power operation processing; If the historical time period is greater than or equal to the preset time, the battery in the battery compartment is made to perform charge and discharge overload processing according to the maximum charge and discharge current and the maximum power.

6. The grid-type energy storage BMS protection method according to claim 1, characterized in that: When the battery is overloaded and charged and discharged, protection processing is performed according to the degree of failure of the battery cell, including: Detect the battery when it is charged and discharged overloaded according to the maximum charge and discharge current and the maximum power to determine the degree of fault, where the degree of fault includes slight fault, moderate fault and severe fault; If it is a minor fault, the battery output power will be modified to the rated power; if it is a moderate fault, the grid-type energy storage system will be prohibited from charging and discharging; if it is a serious fault, the contactor of the grid-type energy storage system will be cut off, and the dry contact will be output to the energy storage inverter to shut down.

7. The grid-type energy storage BMS protection method according to claim 6 is characterized in that: The fault degree is determined by the voltage, current, temperature, internal resistance and charge and discharge efficiency of the battery.

8. A grid-type energy storage BMS protection device, characterized in that: include: The first module is used to obtain the model identification of the battery cell in the BMS and determine the battery cell MAP table according to the model identification; The second module is used to obtain the temperature and SOC value of the battery compartment through the BMS, and determine the maximum charge and discharge current and maximum power that can be executed according to the temperature, SOC value and battery cell MAP table; The third module is used to obtain the fault information and overload status of the battery compartment in the historical time period, and perform charge and discharge overload or rated power operation processing on the battery in the battery compartment according to the fault information and overload status in the historical time period; The fourth module is used to perform protection processing according to the degree of failure of the battery cell when the battery is overloaded and discharged.

9. An electronic device, characterized in that: including a processor and a memory; The memory is used to store programs; The processor executes the program to implement the grid-type energy storage BMS protection method as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The storage medium stores a program, and the program is executed by a processor to implement the grid-type energy storage BMS protection method according to any one of claims 1 to 7.

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