Control method and system for logical low battery threshold-based protection over energy storage system

Abstract

The present application provides a control method and system for logical low battery threshold-based protection over an energy storage system, the method comprising: reading a battery charging and discharging instruction status of an energy storage system; on the basis of the battery charging and discharging instruction status, determining a real-time status of a battery; on the basis of the real-time status of the battery, determining whether the remaining capacity of the battery is lower than a preset low battery threshold; and, if the remaining capacity of the battery is lower than the preset low battery threshold, performing logical low battery threshold-based protection control and management on the battery of the energy storage system. By means of the battery charging and discharging instruction status of the energy storage system, the real-time status of the battery is determined, it is determined, on the basis of the real-time status of the battery, whether the remaining capacity of the battery is lower than the preset low battery threshold, and, when the remaining capacity of the battery is lower than the preset low battery threshold, logical low battery threshold-based protection control and management can be performed on the battery of the energy storage system. Thus, for existing energy storage systems, the problems of a limited control method, lack of systematic integrity for protection over an energy storage system, and lack of capabilities of proactive protection can be solved.

Description

A control method and system for low-battery logic threshold protection of energy storage system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on December 15, 2023, with application number 202311734714.0 and application name “A control method and system for low-battery logic threshold protection of an energy storage system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of computer technology, and in particular to a control method and system for low-battery logic threshold protection of an energy storage system. Background Art

[0003] Currently, energy storage systems, as a cutting-edge energy storage technology, are increasingly being used in systems such as photovoltaics, wind power generation, and grid frequency regulation, along with the development of the photovoltaic and wind power industries. Existing BMS systems based on energy storage batteries unilaterally issue logic control commands that lack active protection control logic, and their control methods are single, lacking system integrity for protecting the energy storage system and active protection capabilities. This is not conducive to maintaining the physical discharge characteristics of the energy storage battery, and the single control method may result in the user being unable to recharge the battery in a timely manner after power is restored, resulting in continued self-discharge of the battery, BMS system downtime, and even irreversible damage to the battery cell characteristics. Therefore, there is an urgent need for a control method for low-battery logic threshold protection for energy storage systems to address the problems of existing single control methods for energy storage systems, lack of system integrity for protecting the energy storage system, and lack of active protection capabilities.

[0004] Application Contents

[0005] The present application provides a control method for low-battery logic threshold protection of an energy storage system, aiming to solve the problem that the existing energy storage system control method is single, the protection of the energy storage system does not have system integrity, and does not have active protection capabilities. The real-time status of the battery is determined by the battery charge and discharge instruction status of the energy storage system, and based on the real-time status of the battery, it is determined whether the remaining battery capacity is lower than the low-battery preset threshold. When the remaining battery capacity is lower than the low-battery preset threshold, the low-battery logic threshold protection control management is performed on the battery of the energy storage system, which can solve the problem that the existing energy storage system control method is single, the protection of the energy storage system does not have system integrity, and does not have active protection capabilities.

[0006] In a first aspect, an embodiment of the present application provides a method for controlling low-battery logic threshold protection of an energy storage system, the method comprising:

[0007] Read the battery charge and discharge instruction status of the energy storage system;

[0008] Determining the real-time status of the battery based on the battery charge and discharge instruction status;

[0009] Based on the real-time status of the battery, determining whether the remaining capacity of the battery is lower than a preset low-battery threshold;

[0010] If the remaining capacity of the battery is lower than the low-battery preset threshold, the battery of the energy storage system is subject to low-battery logic threshold protection control management.

[0011] Optionally, if the remaining capacity of the battery is lower than a preset low-battery threshold, the step of performing low-battery logic threshold control management on the battery of the energy storage system includes:

[0012] If the remaining capacity of the battery is lower than a first low-battery preset threshold, the battery of the energy storage system is subjected to low-battery discharge prohibition protection control management, and it is determined whether charging conditions are met;

[0013] If charging conditions are not met and energy needs to be continued, low power operation will be maintained to facilitate timely user control and management.

[0014] Optionally, after the step of maintaining low-power operation to facilitate timely user control and management if charging conditions are not met and energy needs to be continuously supplied, the method further includes:

[0015] If the battery continues to provide energy and the remaining capacity of the battery is lower than a second low-battery preset threshold, a forced charge state is requested, and it is determined whether charging conditions are met;

[0016] If the charging condition is not met and a forced charging state is requested, a low-battery discharge prohibition protection control management instruction is issued to the energy storage system, and the second threshold is lower than the first threshold.

[0017] Optionally, after the step of requesting a forced charge state and determining whether charging conditions are met if the battery continues to provide energy and the remaining battery capacity is lower than a second low-battery preset threshold, the method further includes:

[0018] If the charging conditions are met and a request for forced charging is issued, the forced charging cycle counting state is entered, and the battery is charged to reach a preset first threshold value for maintaining low power;

[0019] After the remaining capacity of the battery reaches a first threshold value preset for maintaining low power, if the charging condition is continuously not met, the system will continue to prohibit the discharge protection control management instruction.

[0020] Optionally, before the step of entering a forced charging cycle counting state if charging conditions are met and a forced charging state is requested, and charging the battery to reach a first preset low-battery threshold, the method further includes:

[0021] When the battery is in a charging state, determining whether the battery is in a force charging state;

[0022] If the battery is in a strong charge state, the strong charge state is counted to obtain a strong charge count value;

[0023] When the battery is in a discharging state, determining a count value of the last battery discharging state;

[0024] The boost charge cycle count state of the battery is determined based on the boost charge count value and the last battery discharge state count value.

[0025] Optionally, after the step of the system continuously prohibiting the discharge protection control management instruction when the charging condition is continuously not met after the remaining capacity of the battery reaches a preset first threshold for maintaining low power, the method further includes:

[0026] After the remaining capacity of the battery reaches a first threshold preset for maintaining low power, when charging conditions are met, the strong charge cycle count is cleared and the charge and discharge control is restored.

[0027] In a second aspect, an embodiment of the present application further provides a control system for low-battery logic threshold protection of an energy storage system, which is used to execute a control method for low-battery logic threshold protection of an energy storage system provided in an embodiment of the present application.

[0028] In a third aspect, an embodiment of the present application provides a hybrid energy storage inverter embedded computer real-time operating system, the system comprising: a hardware computer platform and a control system for low-power logic threshold protection of the energy storage system, the hardware computer platform being provided with an energy management system, and the control system for low-power logic threshold protection of the energy storage system provided in the embodiment of the present application is embedded in the hardware computer platform management system.

[0029] In a fourth aspect, an embodiment of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps in the control method for low-battery logic threshold protection of the energy storage system provided in the embodiment of the present application are implemented.

[0030] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the control method for low-power logic threshold protection of the energy storage system provided in the embodiment of the present application are implemented.

[0031] In an embodiment of the present application, the battery charge and discharge instruction status of the energy storage system is read; based on the battery charge and discharge instruction status, the real-time status of the battery is determined; based on the real-time status of the battery, it is determined whether the remaining capacity of the battery is lower than a low-battery preset threshold; if the remaining capacity of the battery is lower than the low-battery preset threshold, the battery of the energy storage system is subjected to low-battery logic threshold protection control management. By determining the real-time status of the battery through the battery charge and discharge instruction status of the energy storage system, and based on the real-time status of the battery, determining whether the remaining capacity of the battery is lower than a low-battery preset threshold, when the remaining capacity of the battery is lower than the low-battery preset threshold, the battery of the energy storage system is subjected to low-battery logic threshold protection control management, which can solve the problem that the existing energy storage system control method is single, the protection of the energy storage system does not have system integrity, and does not have active protection capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] FIG1 is a flow chart of a method for controlling low-battery logic threshold protection of an energy storage system provided by an embodiment of the present application;

[0034] FIG2 is a flow chart of another method for controlling low-battery logic threshold protection of an energy storage system provided by an embodiment of the present application;

[0035] FIG3 is a graph showing a state of a strong charge cycle count provided in an embodiment of the present application;

[0036] FIG4 is a modular structure diagram of a low-battery logic threshold protection control method for an energy storage system provided in an embodiment of the present application;

[0037] FIG5 is a flow chart of another energy storage system low power logic threshold protection control method provided by an embodiment of the present application;

[0038] FIG6 is a waveform diagram of a logic control instruction unilaterally issued by a BMS system based on an energy storage battery according to an embodiment of the present application;

[0039] 7 is a diagram showing the effect of a control method for low-battery logic threshold protection of an energy storage system provided by an embodiment of the present application;

[0040] FIG8 is a schematic structural diagram of a control system for low-battery logic threshold protection of an energy storage system provided in an embodiment of the present application;

[0041] 9 is a schematic structural diagram of a real-time operating system for an embedded computer of a hybrid energy storage inverter provided in an embodiment of the present application;

[0042] FIG10 is a schematic structural diagram of an electronic device provided in an embodiment of the present application.

[0043] Among them, SOC is the remaining capacity of the battery; BMS is the battery pack; PCS is the inverter; EMS is the energy management system.

[0044] DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0046] Example 1

[0047] As shown in FIG1 , FIG1 is a flow chart of a method for controlling a low-battery logic threshold protection of an energy storage system provided by an embodiment of the present application. The method for controlling a low-battery logic threshold protection of an energy storage system comprises the following steps:

[0048] 101. Read the battery charge and discharge instruction status of the energy storage system.

[0049] In the embodiment of the present application, the control method of the low-battery logic threshold protection of the energy storage system is applied to the active protection system EMS of the inverter, which is an important part of the PCS process control of the new energy technology industrial energy storage system.

[0050] The above energy storage system is a new energy energy storage system that can store electrical energy.

[0051] The battery charge and discharge instruction state includes a battery charge instruction state and a battery discharge instruction state.

[0052] It should be noted that the purpose of reading the battery charge and discharge instruction status of the energy storage system is to understand the charging and discharging status of the battery.

[0053] 102. Determine the real-time status of the battery based on the battery charge and discharge instruction status.

[0054] In an embodiment of the present application, the real-time status of the battery is identified and monitored in the battery charging and discharging state according to the battery charging and discharging instruction status.

[0055] The real-time status of the battery includes but is not limited to the current, voltage, SOC, and alarm flag of the BMS.

[0056] Specifically, according to the battery charge and discharge instruction status, information such as the terminal voltage, temperature, charge and discharge current and total voltage of the battery pack will be collected in real time.

[0057] 103. Based on the real-time status of the battery, determine whether the remaining battery capacity is lower than a preset low-battery threshold.

[0058] In the embodiment of the present application, the above-mentioned low battery preset threshold can be understood as a low battery threshold preset by the system, which can be a threshold of 15% to 6% of the total battery, or a threshold of 10% to 4% of the total battery.

[0059] The above-mentioned remaining battery capacity refers to the remaining power in the battery. For example, if the rated capacity of a battery is 1000 mA and the threshold value is 15% to 6% of the total power, the remaining battery capacity is a threshold value of 150 mA to 60 mA.

[0060] Furthermore, when the battery power level is lower than the system low power preset threshold, the system will issue a corresponding alarm and prompt the user to charge the battery.

[0061] 104. If the remaining capacity of the battery is lower than the preset low-battery threshold, the battery of the energy storage system is subject to low-battery logic threshold protection control management.

[0062] In the embodiment of the present application, the above-mentioned low-battery preset threshold is a low-battery threshold preset by the system, which is lower than the threshold of 15% to 6% of the total battery power, or can be lower than the threshold of 10% to 4% of the total battery power.

[0063] The low-battery logic threshold protection control management is a threshold protection control management process that prohibits discharging of a battery when the battery is low on power.

[0064] In one possible embodiment, when the remaining battery capacity is lower than a first threshold of 15%, the energy storage system's batteries are subject to low-battery discharge prohibition protection control management, and a determination is made as to whether the system is in a charging condition. If the charging condition is not met, the system is kept in low-battery operation to promptly prompt the user for control management. If the charging condition is not met and the battery continues to provide energy to the system, and the remaining battery capacity reaches a second threshold of 6%, the energy storage system is continuously subject to low-battery discharge prohibition logic threshold protection control management instructions until the next battery pack charging condition is met, thereby avoiding the dangerous behavior of excessive discharge of the battery.

[0065] In another possible embodiment, when the remaining battery capacity is lower than a first threshold of 10%, the battery of the energy storage system is subject to low-power discharge prohibition protection control management, and it is determined whether the system has charging conditions. If the charging conditions are not met, the system is kept in low-power operation so as to prompt the user for control management in a timely manner; if there are no charging conditions and the battery continues to provide energy to the system, and the remaining battery capacity reaches a second threshold of 4%, the battery requests a forced charge state; when the charging conditions are met and the battery issues a forced charge request, the battery is charged to keep the battery charged; if the charging conditions are not met, the battery of the energy storage system will continue to be subject to low-power discharge prohibition protection control management instructions until the next charging conditions for the battery pack are met, thereby protecting the battery from over-discharge and cyclic charge and discharge in a short period of time, which may cause serious damage to the health of the battery cells of the battery pack and shorten the battery life, and other irreversible damage.

[0066] It should be noted that the second threshold is lower than the first threshold.

[0067] It should be noted that when the remaining capacity of the battery is lower than the first low-battery preset threshold, the low-battery discharge prohibition logic threshold protection control management instruction is executed on the battery of the energy storage system. If the low-battery operation is maintained so that the remaining capacity of the battery reaches the second low-battery preset threshold, the low-battery discharge prohibition logic threshold protection control management instruction is continuously executed on the battery of the energy storage system until the next charging condition of the battery pack is met, thereby protecting the battery from over-discharge and irreversible damage to the battery pack caused by cyclic charge and discharge in a short period of time.

[0068] In this embodiment, the battery charge and discharge instruction status of the energy storage system is read; based on the battery charge and discharge instruction status, the real-time status of the battery is determined; based on the real-time status of the battery, it is determined whether the remaining battery capacity is lower than a low-battery preset threshold; if the remaining battery capacity is lower than the low-battery preset threshold, the battery of the energy storage system is subjected to low-battery logic threshold protection control management. The real-time status of the battery is determined by the battery charge and discharge instruction status of the energy storage system, and based on the real-time status of the battery, it is determined whether the remaining battery capacity is lower than a low-battery preset threshold. When the remaining battery capacity is lower than the low-battery preset threshold, the battery of the energy storage system can be subjected to low-battery logic threshold protection control management, which can solve the problems of the existing energy storage system control method being single, the protection of the energy storage system lacking system integrity, and the lack of active protection capability.

[0069] Optionally, in the step of performing low-battery logic threshold protection control management on the battery of the energy storage system when the remaining battery capacity is lower than the low-battery preset threshold, if the remaining battery capacity is lower than the low-battery preset first threshold, the battery of the energy storage system may be subjected to low-battery discharge prohibition protection control management, and it may be determined whether charging conditions are met; if charging conditions are not met and energy needs to continue to be supplied, low-battery operation is maintained for timely user control management.

[0070] In the embodiment of the present application, the above-mentioned remaining battery capacity can be understood as the capacity remaining in the battery, for example, it can be the remaining battery capacity.

[0071] The above-mentioned low power preset first threshold can be lower than 15% of the total power, or lower than 10% of the total power.

[0072] Furthermore, when the remaining battery capacity is less than 15% of the total power, the battery of the energy storage system is subject to low-power discharge prohibition protection control management; when the remaining battery capacity is less than 10% of the total power, the battery of the energy storage system is subject to low-power discharge prohibition protection control management to prevent damage caused by excessive discharge of the battery.

[0073] The above-mentioned lack of charging conditions includes but is not limited to being disconnected from the AC side power grid, being disconnected from the PV side photovoltaic panels, and the PV side not meeting the charging conditions.

[0074] The low-battery discharge prohibition protection control management can be understood as a control management mode in which the system prohibits discharge to protect the battery from damage when the battery power is lower than a threshold preset by the system.

[0075] It should be noted that when the remaining battery capacity is less than 15% or the remaining battery capacity is less than 10%, and the conditions for charging are not met and energy is continuously provided, it is necessary to maintain low-power operation and promptly remind the user to charge to prevent damage caused by excessive battery discharge.

[0076] Optionally, if the charging conditions are not met and energy needs to continue to be output, then after the step of maintaining low-power operation for timely user control management, if the battery continues to provide energy and the remaining battery capacity is lower than the second threshold preset for low power, a forced charging state is requested, and it is determined whether the charging conditions are met; if the charging conditions are not met and a request for a forced charging state is issued, a low-power discharge prohibition protection control management instruction is issued to the energy storage system, and the second threshold is lower than the first threshold.

[0077] In the embodiment of the present application, the second threshold is lower than the first threshold.

[0078] The above-mentioned low-battery preset second threshold value may be 6% of the total battery level, 5% of the total battery level, or 4% of the total battery level.

[0079] The above-mentioned forced charging state refers to a state in which the battery requires forced charging.

[0080] It should be noted that when the remaining battery capacity is less than 15% or the remaining battery capacity is less than 10%, energy will continue to be supplied, and when the remaining battery capacity reaches 6% or the remaining battery capacity reaches 5% or the remaining battery capacity reaches 4%, the battery will be requested to be forced charged. When the charging conditions are not met and a request for forced charging is issued, the battery will be charged first to maintain the power level, and the system will continue to prohibit discharge protection control management instructions until the next charging conditions for the battery pack are met, thereby protecting the battery from irreversible damage to the battery pack due to excessive discharge.

[0081] Optionally, if the battery continues to provide energy and the remaining battery capacity is lower than the second threshold value preset for low power, a forced charging state is requested, and after the step of determining whether the charging conditions are met, if the charging conditions are met and a request for a forced charging state is issued, a forced charging cycle counting state is entered, and the battery is charged to reach the first threshold value preset for maintaining low power; after the remaining battery capacity reaches the first threshold value preset for maintaining low power, if the charging conditions continue to be unmet, the system will continue to prohibit the discharge protection control management instruction.

[0082] In the embodiment of the present application, the above-mentioned forced charging cycle counting state can be understood as when the charging conditions are met and the battery issues a request for forced charging, a forced charging instruction is completed, and after reaching the power maintenance threshold, when the user control still needs to output energy, the output energy makes the remaining capacity of the battery reach the low power preset second threshold, and when the charging conditions are met and the forced charging state is continued to be requested, another forced charging instruction is completed, and so on. After completing one forced charging cycle, when the charging conditions are met and the forced charging state is continued to be requested, the forced charging cycle is counted and marked.

[0083] The above-mentioned strong charge cycle counting state can be specifically an active protection measure for the battery, which logically controls the battery charge and discharge when the battery discharge state reaches a low power threshold to avoid the dangerous behavior of excessive discharge of the battery.

[0084] The above-mentioned charging conditions include but are not limited to being connected to the AC side grid, being connected to the PV side photovoltaic panels, and the PV side meeting the charging conditions.

[0085] Furthermore, when charging conditions are met and the battery issues a forced charging request, the battery is charged first to maintain the existing battery power.

[0086] It should be noted that after the remaining capacity of the battery reaches the preset first threshold for maintaining low power, if the charging conditions continue to be unable to be met, the system will continue to prohibit discharge instructions until the next charging conditions for the battery pack are met, thereby protecting the battery from excessive discharge and cyclic charge and discharge in a short period of time, which seriously damages the health of the battery cells, shortens the battery life, and causes irreversible damage to the battery pack.

[0087] Optionally, if the charging conditions are met and a request for forced charging is issued, the forced charging cycle counting state is entered, and before the step of charging the battery to reach a preset first threshold value for maintaining low power, it is also possible to determine whether the battery is in a forced charging state when the battery is in a charging state; if the battery is in a forced charging state, count the forced charging states to obtain a forced charging count value; when the battery is in a discharging state, determine the last battery discharge state count value; and determine the battery's forced charging cycle counting state based on the forced charging count value and the last battery discharge state count value.

[0088] In the embodiment of the present application, the above-mentioned forced charging state refers to the battery requesting forced charging; the above-mentioned forced charging count value refers to the value obtained by counting the forced charging states.

[0089] The above-mentioned last battery discharge state count value can be understood as the remaining power of the battery during the last discharge, and the value obtained by counting.

[0090] The above-mentioned forced charging cycle counting state can be understood as when the charging conditions are met and the battery issues a request for forced charging, a forced charging instruction is completed, and after reaching the first threshold preset for maintaining low power, the user still needs to continue to output energy, and the output energy makes the remaining capacity of the battery reach the second threshold preset for low power, and continues to request forced charging, and another forced charging instruction is completed, and so on. After completing a forced charging cycle, the charging conditions are met and the forced charging state is continued to be requested, and the forced charging cycle is counted and marked.

[0091] It should be noted that the forced charge cycle count state can be specifically an active protection measure for the battery, which logically controls the battery charge and discharge when the battery discharge state reaches a low power threshold to avoid the dangerous behavior of over-discharge of the battery.

[0092] Optionally, after the remaining battery capacity reaches the first preset threshold for maintaining low power, if the charging conditions continue to be unavailable, the system will continue to prohibit the discharge protection control management instruction. After the remaining battery capacity reaches the first preset threshold for maintaining low power, if the charging conditions are available, the forced charging cycle count will be cleared and the charging and discharging control will be restored.

[0093] In an embodiment of the present application, the above-mentioned low-battery preset first threshold may be lower than 15% of the total battery power, or lower than 10% of the total battery power.

[0094] The above-mentioned charging conditions include but are not limited to being connected to the AC side power grid, being connected to the PV side photovoltaic panels, and the PV side meeting the charging conditions.

[0095] The above-mentioned forced charge cycle count can be an active protection measure for the battery, which can logically control the battery charge and discharge when the battery discharge state reaches a low power threshold to avoid the dangerous behavior of over-discharge of the battery.

[0096] It should be noted that when the remaining battery capacity reaches 15% of the total power or 10% of the total power and the charging conditions are met, the strong charge cycle count will be cleared and the charge and discharge control will be restored.

[0097] In the embodiments of this application, sustainability can be made a key factor in the new energy storage system process through this application, helping different battery manufacturers / BMS to choose efficient and healthy energy responses driven by sustainable development; and in the case of not relying entirely on the BMS system of the supply chain enterprise, it can still determine specific safety protection strategies for customers; and also provide reliable energy data for sustainable energy storage new energy systems: detection data, startup repair, and rationality estimation. This application eliminates the potential safety hazards that may arise from frequent short-term charging and discharging of energy storage battery packs, including but not limited to high-temperature flammability, explosion, and battery health loss.

[0098] Example 2

[0099] In this embodiment, FIG2 is a flow chart of another control method for low-battery logic threshold protection of an energy storage system provided by an embodiment of the present application. Specifically, the following steps are included:

[0100] 200. Start.

[0101] 201. Is the battery in a discharging state?

[0102] If the battery is in a discharging state, the process proceeds to step 202 ; otherwise, the battery charging state is recorded and the process proceeds to step 202 .

[0103] 202. Is the battery in the strong charging state?

[0104] If the battery is in a strong charging state, the process proceeds to step 203 ; otherwise, the process records a non-strong charging state and proceeds to step 201 .

[0105] 203. Limit discharge, force charge count +1.

[0106] When the battery power is lower than a specified threshold, discharge is restricted. When the power reaches a lower threshold, forced charging is requested for the battery, and the forced charging count is increased by 1.

[0107] The above-specified threshold can be understood as a low power threshold set by the system, which can be lower than 15% of the power level, or lower than 10% of the power level, etc.; the above-mentioned lower threshold can be 6%, 5%, 4% of the power level, etc.

[0108] 204. Has the discharge delay time been reached?

[0109] If the discharge delay time is reached, the process proceeds to step 205 ; otherwise, the process proceeds to step 204 .

[0110] 205. Have the charging conditions been met?

[0111] If the charging conditions are met, the process proceeds to step 207; otherwise, the process proceeds to step 206. Failure to meet the charging conditions includes, but is not limited to, disconnection from the AC side grid, disconnection from the PV side photovoltaic panels, or failure of the PV side to meet the charging conditions.

[0112] 206. Continuously limit discharge.

[0113] Among them, when the charging conditions cannot be met continuously, the discharge instruction will be continuously prohibited until the next charging conditions for the battery pack are met, thereby protecting the battery from over-discharge and cyclic charge and discharge in a short period of time, which will seriously damage the health of the battery cells and shorten the battery life.

[0114] 207. Restore charge and discharge control.

[0115] Among them, the charging conditions are met and the charge and discharge control is restored.

[0116] 208. End.

[0117] This application can perform low-battery logic threshold protection on battery charging and discharging when the battery is discharged to a low-battery threshold, thereby avoiding the dangerous behavior of over-discharging of the battery.

[0118] Example 3

[0119] In this embodiment, FIG3 is a graph of the forced charge cycle count state provided by an embodiment of the present application. When the remaining battery capacity is lower than a specified threshold, a discharge prohibition protection instruction is responded to. In this case, it is determined whether charging conditions are met. If charging conditions are not met, low power operation is maintained to promptly respond to user control. If there is a continuous lack of charging conditions and energy is continued to be provided to a lower threshold, a forced charge request is made for the battery, and a mark 1 is made. When charging conditions are met and the battery issues a forced charge request, the battery is charged to achieve the purpose of maintaining power. When a forced charge is completed and the power retention threshold is reached, a mark 2 is made. If the user control instruction still requires continued energy output, the energy storage system low power logic threshold protection control management is performed according to marks 1 and 2.

[0120] Specifically, in FIG3 , the specified threshold may be 10% of the total power; the lower value range may be when the power reaches 4%.

[0121] Furthermore, when mark 1 appears and the value of mark 2 +1 is set to 1, the instruction to prohibit discharge will continue (the system does not allow the battery to output energy) until the end of the N1 time interval; similarly, after completing a strong charge cycle, when mark 1 appears and the value of mark 2 +1 is set to 2, the instruction to prohibit discharge will continue until the end of the N2 time interval; when the charging conditions cannot be met continuously, the system will continue to prohibit the discharge instruction until the next charging condition for the battery pack is met, the battery pack meets the charging condition and the battery growth exceeds 11% of the total power, the strong charge cycle count is cleared, and the charge and discharge control is restored, thereby protecting the battery from over-discharge and cyclic charge and discharge in a short period of time, which may cause serious damage to the health of the battery cells and shorten the battery life, and other irreversible damage.

[0122] In this embodiment, N is an integer or decimal of any type of precision, and N1, N2, and subsequent intervals such as N3 are only used as time interval identifiers. There is no size, linear or nonlinear relationship, and this is not a limitation of this application.

[0123] It should be noted that the forced charge cycle count state can be specifically an active protection measure for the battery, which logically controls the battery charge and discharge when the battery discharge state reaches a low power threshold to avoid the dangerous behavior of over-discharge of the battery.

[0124] Example 4

[0125] In this embodiment, Figure 4 is a modular structure diagram of a low-battery logic threshold protection control method for an energy storage system provided in this embodiment of the application. This includes: PCS / EMS monitoring, BMS data, the low-battery logic threshold protection control method for an energy storage system provided in this application, and control instructions.

[0126] Among them, the raw data sampling module is used to read the battery charging and discharging status, and identify and monitor the real-time status of the battery.

[0127] A fast processing calculation module is used to execute the low-power logic threshold protection control method for the energy storage system provided in this application.

[0128] The logic control protection module is used to call the energy storage system low power logic threshold protection control method provided in this application to realize the logic control of battery charging and discharging.

[0129] This embodiment promotes the resilience of the energy storage battery pack BMS by monitoring bidirectional data between the inverter (PCS / EMS) and the battery pack (BMS). When the battery discharge state reaches a low-battery threshold, the energy storage system low-battery logic threshold protection control method provided in this application is invoked to implement logical control of battery charging and discharging, thereby preventing the dangerous behavior of excessive battery discharge.

[0130] Example 5

[0131] In this embodiment, FIG5 is a flow chart of another energy storage system low power logic threshold protection control method provided by the embodiment of the present application, which specifically includes the following steps:

[0132] Logic step 1: Read the charge and discharge instruction status.

[0133] Logical step 2: Read the battery charge and discharge status and the boost charge flag.

[0134] Logic step 3: Count based on the strong charge state and the last discharge state.

[0135] Logic step 4: Accumulate the count and delay to limit the discharge delay.

[0136] Logical step 5: The battery reaches the charging condition or SOC growth limit, clears the strong charge cycle count, and resumes charge and discharge control.

[0137] In this embodiment, the present application can protect the battery from over-discharge and cyclic charge and discharge in a short period of time, which may cause serious damage to the health of the battery cells of the battery pack and shorten the battery life, and other irreversible damage.

[0138] Example 6

[0139] In this embodiment, Figure 6 is a waveform diagram of a logic control instruction unilaterally issued by a BMS system based on an energy storage battery provided in this embodiment of the application. When the remaining battery capacity falls below a specified threshold, a battery protection logic control instruction is activated, and the BMS communication system issues a discharge prohibition flag or a low battery voltage alarm signal, or a level 3 or higher alarm forcibly disconnects the circuit relay.

[0140] The above-mentioned specified threshold value may be 5%, 4% or the like of the total power.

[0141] In this embodiment, the logical control instructions unilaterally issued by the BMS system based on the energy storage battery do not have active protection control logic, and the control method is simple, simply stopping discharge or disconnecting the discharge circuit. This does not protect the integrity of the energy storage system and lacks active protection capabilities, which is not conducive to maintaining the physical discharge characteristics of the energy storage battery. Disconnecting the discharge circuit alone may result in the user-side power supply being unable to recharge the battery in a timely manner, the battery continuing to self-discharge, the BMS system crashing, and even irreversible damage to the battery cell characteristics.

[0142] Example 7

[0143] In this embodiment, Figure 7 is a rendering of the control method for low-battery logic threshold protection of an energy storage system provided by the embodiment of the present application. This application is used in the active protection system (EMS) of the inverter, which is an important step in the process control of the PCS of the new energy counting industrial energy storage system.

[0144] Among them, when the battery discharge state reaches the low power threshold, this application is called to implement logical control of battery charging and discharging to avoid the dangerous behavior of over-discharging of the battery.

[0145] Furthermore, when the charging conditions cannot be met continuously, the battery will be prohibited from discharging the low-battery threshold protection control management instruction until the next charging conditions for the battery pack are met, and the charge and discharge control will be restored, eliminating the safety hazards that may arise from frequent charging and discharging of the energy storage battery pack in a short period of time, including but not limited to high temperature flammability, explosion, and battery health loss.

[0146] Example 8

[0147] Based on the above-mentioned embodiment 1, as shown in FIG8 , a schematic structural diagram of a control system for low-battery logic threshold protection of an energy storage system provided in an embodiment of the present application is provided. The control system for low-battery logic threshold protection of an energy storage system is used to execute the control method for low-battery logic threshold protection of an energy storage system provided in an embodiment of the present application. The control system for low-battery logic threshold protection of an energy storage system includes:

[0148] Reading module 801, used to read the battery charge and discharge instruction status of the energy storage system;

[0149] A first determining module 802 is configured to determine a real-time state of the battery based on the battery charge and discharge instruction state;

[0150] A second determining module 803 is configured to determine whether the remaining capacity of the battery is lower than a preset low-battery threshold based on the real-time status of the battery;

[0151] The first control module 804 is configured to perform low-battery logic threshold protection control management on the battery of the energy storage system if the remaining capacity of the battery is lower than a preset low-battery threshold.

[0152] Optionally, the first control module 804 includes:

[0153] A first control submodule is configured to perform low-battery discharge prohibition protection control management on the battery of the energy storage system if the remaining capacity of the battery is lower than a first low-battery preset threshold, and determine whether charging conditions are met;

[0154] The second control submodule is used to maintain low power operation if charging conditions are not met and energy needs to be continued to be provided so as to facilitate timely user control and management.

[0155] Optionally, the system further includes:

[0156] A first judgment submodule is configured to request a forced charge state if the battery continues to provide energy and the remaining capacity of the battery is lower than a second low-battery preset threshold, and to determine whether charging conditions are met;

[0157] The second control module is configured to issue a low-battery-discharge-prohibited protection control management instruction to the energy storage system if the charging condition is not met and a forced charging state is requested, and the second threshold is lower than the first threshold.

[0158] Optionally, the system further includes:

[0159] A first processing module is configured to enter a forced charging cycle counting state if charging conditions are met and a forced charging state is requested, and charge the battery to reach a first preset low-battery threshold;

[0160] The second processing module is used for the system to continuously prohibit the discharge protection control management instruction when the remaining capacity of the battery reaches a first threshold preset for maintaining low power and the charging condition is continuously not met.

[0161] Optionally, the system further includes:

[0162] A third determining module, configured to determine whether the battery is in a forced charging state when the battery is in a charging state;

[0163] a counting module, configured to count the number of times the battery is in a strong charge state to obtain a strong charge count value;

[0164] a fourth determining module, configured to determine a count value of a previous battery discharge state when the battery is in a discharge state;

[0165] A fifth determining module is configured to determine a boost charge cycle count state of the battery based on the boost charge count value and the last battery discharge state count value.

[0166] Optionally, the system further includes:

[0167] The third processing module is used to clear the strong charge cycle count and restore charge and discharge control when the remaining capacity of the battery reaches a first threshold preset for maintaining low power and the charging condition is met.

[0168] Example 9

[0169] Based on the eighth embodiment described above, Figure 9 is a schematic diagram of the structure of a real-time operating system for an embedded computer in a hybrid energy storage inverter, provided in an embodiment of the present application. The system includes a hardware computer platform and a control system for low-battery logic threshold protection for the energy storage system. The hardware computer platform is equipped with an energy management system, and the control system for low-battery logic threshold protection for the energy storage system provided in the above embodiment is embedded in the hardware computer platform's energy management system.

[0170] In this embodiment, the present application can run in a real-time operating system of an embedded computer of a hybrid energy storage inverter, using the inverter (PCS) as a hardware computer platform, and an energy management system (EMS) is provided on the hardware platform. The control system of the low-power logic threshold protection of the energy storage system of the present application is embedded in the EMS.

[0171] This application achieves new energy sustainability through the PCS / EMS system of the core control device (embedded in the inverter) without increasing hardware costs and additional expenses; this application can eliminate the safety hazards that may arise from frequent charging and discharging of energy storage battery packs in a short period of time, including but not limited to high-temperature explosions and battery health loss.

[0172] Example 10

[0173] Referring to FIG. 10 , FIG. 10 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. As shown in FIG. 10 , the electronic device includes: a memory 1002, a processor 1001, and a computer program for controlling a method for low-battery logic threshold protection of an energy storage system, which is stored in the memory 1002 and can be run on the processor 1001, wherein:

[0174] The processor 1001 is configured to call the computer program stored in the memory 1002 and execute the following steps:

[0175] Read the battery charge and discharge instruction status of the energy storage system;

[0176] Determining the real-time status of the battery based on the battery charge and discharge instruction status;

[0177] Based on the real-time status of the battery, determining whether the remaining capacity of the battery is lower than a preset low-battery threshold;

[0178] If the remaining capacity of the battery is lower than the low-battery preset threshold, the battery of the energy storage system is subject to low-battery logic threshold protection control management.

[0179] Optionally, the step of performing low-battery logic threshold control management on the battery of the energy storage system when the remaining capacity of the battery is lower than a preset low-battery threshold, executed by the processor 1001, includes:

[0180] If the remaining capacity of the battery is lower than a first low-battery preset threshold, the battery of the energy storage system is subjected to low-battery discharge prohibition protection control management, and it is determined whether charging conditions are met;

[0181] If charging conditions are not met and energy needs to be continued, low power operation will be maintained to facilitate timely user control and management.

[0182] Optionally, after the step of maintaining low-power operation to facilitate timely user control and management if charging conditions are not met and energy needs to continue to be provided, the method executed by the processor 1001 further includes:

[0183] If the battery continues to provide energy and the remaining capacity of the battery is lower than a second low-battery preset threshold, a forced charge state is requested, and it is determined whether charging conditions are met;

[0184] If the charging condition is not met and a forced charging state is requested, a low-battery discharge prohibition protection control management instruction is issued to the energy storage system, and the second threshold is lower than the first threshold.

[0185] Optionally, after the step of requesting a forced charge state and determining whether charging conditions are met if the battery continues to provide energy and the remaining battery capacity is lower than a low-battery preset second threshold, the method executed by the processor 1001 further includes:

[0186] If the charging conditions are met and a request for forced charging is issued, the forced charging cycle counting state is entered, and the battery is charged to reach a preset first threshold value for maintaining low power;

[0187] After the remaining capacity of the battery reaches a first threshold value preset for maintaining low power, if the charging condition is continuously not met, the system will continue to prohibit the discharge protection control management instruction.

[0188] Optionally, before the step of entering a forced charging cycle counting state if charging conditions are met and a forced charging state is requested, and charging the battery to reach a preset first threshold for maintaining low power, the method executed by the processor 1001 further includes:

[0189] When the battery is in a charging state, determining whether the battery is in a force charging state;

[0190] If the battery is in a strong charge state, the strong charge state is counted to obtain a strong charge count value;

[0191] When the battery is in a discharging state, determining a count value of the last battery discharging state;

[0192] The boost charge cycle count state of the battery is determined based on the boost charge count value and the last battery discharge state count value.

[0193] Optionally, after the step of the system continuously prohibiting the discharge protection control management instruction when the charging condition is continuously not met after the remaining capacity of the battery reaches a first preset low-battery-power threshold, the method executed by the processor 1001 further includes:

[0194] After the remaining capacity of the battery reaches a first threshold preset for maintaining low power, when charging conditions are met, the strong charge cycle count is cleared and the charge and discharge control is restored.

[0195] The electronic device provided in the embodiment of the present application can implement each process of a control method for low-battery logic threshold protection of an energy storage system and can achieve the same beneficial effects. To avoid repetition, it will not be described here.

[0196] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the computer program implements the various processes of a control method for low-battery logic threshold protection of an energy storage system provided in an embodiment of the present application, and can achieve the same technical effect. To avoid repetition, the details will not be repeated here.

[0197] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When executed, the program can include the processes in the above-described method embodiments. The computer-readable storage medium can be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

[0198] The above disclosure is only a preferred embodiment of the present application, and certainly cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made according to the claims of the present application are still within the scope covered by the present application.

Claims

1. A control method for low - power logical threshold protection of an energy storage system, characterized in that, The method includes: Reading the battery charge and discharge command status of the energy storage system; Determining the real-time status of the battery based on the battery charge and discharge command status; Determining whether the remaining capacity of the battery is lower than the low battery preset threshold based on the real-time status of the battery; If the remaining capacity of the battery is lower than the low battery preset threshold, then perform low battery logic threshold protection control management on the battery of the energy storage system.

2. The method according to claim 1, characterized in that, The steps of performing low battery logic threshold protection control management on the battery of the energy storage system when the remaining capacity of the battery is lower than the low battery preset threshold include: If the remaining capacity of the battery is lower than the first low battery preset threshold, then perform low battery discharge prohibition protection control management on the battery of the energy storage system, and determine whether charging conditions are available; If charging conditions are not available and energy needs to be continuously provided, then maintain low battery operation for timely user control management.

3. The method according to claim 2, characterized in that, After the step of maintaining low battery operation for timely user control management when charging conditions are not available and energy needs to be continuously provided, the method further includes: If the battery continues to provide energy and the remaining capacity of the battery is lower than the second low battery preset threshold, then request a forced charge state and determine whether charging conditions are available; If charging conditions are not available and a forced charge state is requested, then issue a low battery discharge prohibition protection control management instruction to the energy storage system, and the second threshold is lower than the first threshold.

4. The method according to claim 3, characterized in that, After the step of requesting a forced charge state and determining whether charging conditions are available when the battery continues to provide energy and the remaining capacity of the battery is lower than the second low battery preset threshold, the method further includes: If charging conditions are available and a forced charge state is requested, then enter the forced charge cycle counting state and charge the battery to reach and maintain the first low battery preset threshold; After the remaining capacity of the battery reaches and maintains the first low battery preset threshold and charging conditions are continuously unavailable, the system will continuously issue a discharge prohibition protection control management instruction.

5. The method according to claim 4, characterized in that, Before the step of entering the forced charge cycle counting state and charging the battery to reach and maintain the first low battery preset threshold when charging conditions are available and a forced charge state is requested, the method further includes: When the battery is in a charging state, determining whether the battery is in a forced charge state; If the battery is in a forced charge state, then count the forced charge state to obtain a forced charge count value; When the battery is in a discharging state, determining the previous battery discharge state count value; Determining the forced charge cycle counting state of the battery based on the forced charge count value and the previous battery discharge state count value.

6. The method according to claim 4, characterized in that, After the step of continuously issuing a discharge prohibition protection control management instruction when charging conditions are continuously unavailable after the remaining capacity of the battery reaches and maintains the first low battery preset threshold, the method further includes: When charging conditions are available after the remaining capacity of the battery reaches and maintains the first low battery preset threshold, then clear the forced charge cycle count and resume charge and discharge control.

7. A control system for low - power logical threshold protection of an energy storage system, characterized in that, The control system for low battery logic threshold protection of the energy storage system is used to execute the control method for low battery logic threshold protection of the energy storage system as described in claims 1-6.

8. A real - time operating system for an embedded computer of a hybrid energy storage inverter, characterized in that, The system includes: a hardware computer platform and a control system for protecting the low battery logic threshold of the energy storage system. The hardware computer platform is provided with an energy management system, and the control system for protecting the low battery logic threshold of the energy storage system described in claim 7 is embedded in the management system of the hardware computer platform.

9. An electronic device, characterized in that, Comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the steps in the control method for protecting the low battery logic threshold of the energy storage system described in any one of claims 1 to 6 are implemented.

10. A computer - readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium. When the computer program is executed by a processor, the steps in the control method for protecting the low battery logic threshold of the energy storage system described in any one of claims 1 to 6 are implemented.

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