Battery control method, control device, photovoltaic energy storage system, and storage medium

Abstract

The present application discloses a battery control method, a control device, a photovoltaic energy storage system, and a storage medium, wherein the method is applied to the photovoltaic energy storage system. The photovoltaic energy storage system comprises a photovoltaic string (100) and an energy storage battery (200). The battery control method comprises: detecting the working state of a photovoltaic energy storage system and the power level of an energy storage battery (200) (S101); and when a trigger condition of a battery sleep strategy is satisfied, controlling the energy storage battery (200) to enter a sleep mode (S102), wherein the trigger condition of the battery sleep strategy comprises at least one of the following: a duration in which the photovoltaic energy storage system is in a standby state is greater than a first duration; in an off-grid mode, the power level of the energy storage battery (200) is lower than a backup power level or a discharge cut-off power level, and no power supply input of the photovoltaic string (100) is detected; and the photovoltaic string (100) and / or the energy storage battery (200) has a fault.

Description

Battery control method, control device, solar storage system and storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 202311577029.1 filed on November 23, 2023, entitled “Battery control method, control device, photoelectric storage system and storage medium,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of photovoltaic power generation, and in particular to a battery control method, a control device, a photovoltaic storage system, and a storage medium. Background Art

[0004] In a photovoltaic storage system, the energy storage battery is connected to the inverter for a long time. When the system is in abnormal operation, the self-consumption of power by the inverter and battery cells will cause the battery power to drop rapidly, and eventually be exhausted, thereby damaging the battery and shortening the battery life.

[0005] Summary of the Invention

[0006] To at least partially solve one of the technical problems described above, embodiments of the present application provide a battery control method, a control device, a photovoltaic storage system, and a storage medium.

[0007] In a first aspect, embodiments of the present application provide a battery control method, which is applied to a photovoltaic storage system, wherein the photovoltaic storage system includes a photovoltaic string and an energy storage battery, and the method includes:

[0008] Detecting the working status of the photovoltaic storage system and the power level of the energy storage battery;

[0009] When the triggering conditions of the battery dormancy strategy are met, controlling the energy storage battery to enter the dormancy mode;

[0010] The triggering condition of the battery dormancy strategy includes at least one of the following:

[0011] The duration for which the solar energy storage system is in the standby state is greater than the first duration;

[0012] In the off-grid mode, the power level of the energy storage battery is lower than the standby power level or the discharge cut-off power level, and no power input from the photovoltaic string is detected;

[0013] The photovoltaic string and / or the energy storage battery fails.

[0014] In some embodiments of the present application, when the triggering conditions of the battery dormancy strategy are met, the energy storage battery is controlled to enter the dormancy mode, including: in the off-grid mode, when the power level of the energy storage battery is lower than the standby power level or the discharge cut-off power level, stopping the discharge of the energy storage battery and detecting the power supply input of the photovoltaic string; when the power supply input of the photovoltaic string is not detected, switching the photovoltaic storage system to a standby state, and detecting a first power level in the standby state; and when the first power level is lower than a first preset power level, controlling the energy storage battery to enter the dormancy mode.

[0015] In some embodiments of the present application, after stopping the discharge of the energy storage battery and detecting the power input of the photovoltaic string, the method further includes: when the power input of the photovoltaic string is detected, replenishing the power of the energy storage battery to a second power level through the power input of the photovoltaic string, wherein the second power level is greater than the backup power level or the discharge cut-off power level.

[0016] In some embodiments of the present application, when the triggering conditions of the battery dormancy strategy are met, controlling the energy storage battery to enter the dormancy mode also includes: in off-grid mode, when the photovoltaic storage system fails, switching the photovoltaic storage system to a standby state; controlling the photovoltaic storage system to clear the fault, restarting the photovoltaic storage system, and recording the first restart number of the photovoltaic storage system; when the first restart number is greater than a first preset number, performing a fault detection on the photovoltaic storage system; and when a fault is detected in the photovoltaic string and / or the energy storage battery, controlling the energy storage battery to enter the dormancy mode.

[0017] In some embodiments of the present application, after fault detection is performed on the photovoltaic storage system, the method further includes: when it is detected that the inverter fails and the photovoltaic string and the energy storage battery do not fail, detecting the power supply input of the photovoltaic string; and when the power supply input of the photovoltaic string is detected and the power level of the energy storage battery is lower than the discharge cut-off power level, replenishing the energy storage battery through the power supply input of the photovoltaic string.

[0018] In some embodiments of the present application, when the current working state of the photovoltaic storage system meets the triggering conditions of the battery dormancy strategy, controlling the energy storage battery to enter the dormancy mode also includes: in the grid-connected mode, when the photovoltaic storage system fails, switching the photovoltaic storage system to the standby state; controlling the photovoltaic storage system to clear the fault, restarting the photovoltaic storage system, and recording the second restart number of the photovoltaic storage system; when the second restart number is greater than the second preset number, performing a fault detection on the photovoltaic storage system; and when a fault of the photovoltaic string and / or the energy storage battery is detected, controlling the energy storage battery to enter the dormancy mode.

[0019] In some embodiments of the present application, after fault detection is performed on the photovoltaic storage system, the method further includes: when it is detected that the inverter fails and the photovoltaic string and the energy storage battery do not fail, detecting the power supply input of the photovoltaic string; and when the power supply input of the photovoltaic string is detected and the power level of the energy storage battery is lower than the discharge cut-off power level, replenishing the energy storage battery through the power supply input of the photovoltaic string.

[0020] In some embodiments of the present application, after detecting the power input of the photovoltaic string, the method further includes: when the power input of the photovoltaic string is not detected, supplementing the energy storage battery with power through the power grid.

[0021] In some embodiments of the present application, after the energy storage battery is replenished, the method further includes: replenishing the power of the energy storage battery to a third power level, wherein the third power level is greater than the backup power level or the discharge cut-off power level; and performing fault detection on the photovoltaic storage system after replenishment.

[0022] In some embodiments of the present application, the method further includes: in the grid-connected mode, when the power level of the energy storage battery is lower than the standby power level or the discharge cut-off power level, stopping the discharge of the energy storage battery and detecting the power supply input of the photovoltaic string; and when the power supply input of the photovoltaic string is detected, replenishing the power level of the energy storage battery to a fourth power level through the power supply input of the photovoltaic string, wherein the fourth power level is greater than the standby power level or the discharge cut-off power level.

[0023] In some embodiments of the present application, after stopping the discharge of the energy storage battery and detecting the power input of the photovoltaic string, the method further includes: when the power input of the photovoltaic string is not detected, replenishing the power of the energy storage battery to a fourth power level through the power grid.

[0024] In some embodiments of the present application, after detecting a failure of the photovoltaic string and / or the energy storage battery and controlling the energy storage battery to enter a sleep mode, the method further includes: activating the energy storage battery according to a preset cycle.

[0025] In a second aspect, an embodiment of the present application further provides a control device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the battery control method as described in the first aspect is implemented.

[0026] In a third aspect, an embodiment of the present application further provides a photovoltaic storage system, comprising the control device as described in the second aspect.

[0027] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the battery control method as described in the first aspect.

[0028] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purpose and other advantages of the present application can be realized and obtained through the structures particularly pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0030] FIG1 is a schematic diagram of a photovoltaic storage system according to an embodiment of the present application;

[0031] FIG2 is a flow chart of a battery control method provided by one embodiment of the present application;

[0032] FIG3 is a flowchart of the specific method of step S102 in FIG2 ;

[0033] FIG4 is a flow chart of a battery control method provided by another embodiment of the present application;

[0034] FIG5 is another flow chart of the specific method of step S102 in FIG2 ;

[0035] FIG6 is a flow chart of a battery control method provided by another embodiment of the present application;

[0036] FIG7 is another flow chart of the specific method of step S102 in FIG2 ;

[0037] FIG8 is a flow chart of a battery control method provided by another embodiment of the present application;

[0038] FIG9 is a flow chart of a battery control method provided by another embodiment of the present application;

[0039] FIG10 is a flow chart of a battery control method provided by another embodiment of the present application;

[0040] FIG11 is a flow chart of a battery control method provided by another embodiment of the present application;

[0041] FIG12 is a flow chart of a battery control method provided by another embodiment of the present application;

[0042] FIG13 is a flow chart of a battery control method provided by another embodiment of the present application;

[0043] FIG14 is a flow chart of a battery control method provided by an example of the present application;

[0044] FIG15 is a flow chart of a battery control method provided by another example of the present application; and

[0045] FIG16 is a schematic diagram of a control device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementation methods. At the same time, the steps or actions in the method description can also be swapped or adjusted in order in a manner that is obvious to those skilled in the art. Therefore, the various orders in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a necessary order, unless otherwise specified that a certain order must be followed.

[0047] In the description of this application, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The terms "first" and "second" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number or order of the technical features indicated.

[0048] The serial numbers assigned to components herein, such as "first," "second," etc., are used solely to distinguish the objects being described and do not convey any sequential or technical meaning. References to "connection" and "coupling" herein, unless otherwise specified, include both direct and indirect connections (couplings).

[0049] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0050] In a photovoltaic storage system, the energy storage battery is connected to the inverter for a long time. When the system is in abnormal operation, the self-consumption of power by the inverter and battery cells will cause the battery power to drop rapidly, and eventually be exhausted, thereby damaging the battery and shortening the battery life.

[0051] Related technologies typically prevent rapid battery depletion by controlling the battery to enter a dormant state. However, simply determining dormancy based on the battery's charge and discharge power is inaccurate. When the solar-powered storage system experiences a fault or other complex operating conditions, the battery may still output power, but the power level required for dormancy has not yet been reached. Therefore, the battery cannot be put into dormancy, resulting in abnormal battery depletion.

[0052] When the solar storage system works abnormally, the battery is over-discharged, not recharged or repaired in time, and cannot work normally for a long time, resulting in the battery power being exhausted. By the time maintenance is required, the battery is damaged and needs to be replaced, which is very costly.

[0053] Based on the above situation, the embodiments of the present application provide a battery control method, a control device, a photovoltaic storage system and a storage medium: detecting the working status of the photovoltaic storage system and the power of the energy storage battery to determine whether an abnormal situation occurs in the photovoltaic storage system. When the photovoltaic storage system is in a standby state for a period of time greater than a first period of time, it indicates that the energy storage battery has been in a working state, which may cause the battery to be overcharged or over-discharged. It is necessary to control the energy storage battery to enter a sleep mode to prevent the battery power from being abnormally exhausted. In off-grid mode, the power of the energy storage battery is lower than the standby power or the discharge cut-off power, indicating that the power of the energy storage battery is too low, and no power input from the photovoltaic string is detected, indicating that the energy storage battery cannot be recharged. It is necessary to control the energy storage battery to enter a sleep state to reduce energy loss and maintain the power by hibernating the energy storage battery. When a photovoltaic string or energy storage battery fails, it indicates that the photovoltaic string cannot generate electricity or the battery cannot be charged. It is necessary to control the energy storage battery to enter a sleep mode to prevent the battery from being over-discharged and abnormally exhausted, thereby further extending the life of the energy storage battery. In the embodiments of the present application, the battery can be put into sleep mode according to different abnormal states of the photovoltaic storage system to prevent the battery power from being abnormally exhausted.

[0054] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0055] As shown in FIG1 , FIG1 is a schematic diagram of a photovoltaic storage system provided in one embodiment of the present application.

[0056] In some embodiments, the photovoltaic storage system includes a photovoltaic string 100, an energy storage battery 200 and an inverter 300, wherein the energy of the photovoltaic string 100 is output to the DC bus through a first DC / DC circuit, the energy storage battery 200 outputs energy to the DC bus through a second DC / DC circuit, and the DC / AC circuit inverts the energy on the bus and connects it to the grid.

[0057] When the photovoltaic storage system is in off-grid mode, the energy of the photovoltaic string 100 is transmitted to the energy storage battery 200 through the first DC / DC circuit and the second DC / DC circuit to charge the energy storage battery 200; when the photovoltaic storage system is in grid-connected mode, the energy of the photovoltaic string 100 is transmitted to the energy storage battery 200 through the first DC / DC circuit and the second DC / DC circuit, and the energy of the grid is transmitted to the energy storage battery 200 through the DC / AC circuit and the second DC / DC circuit to charge the energy storage battery 200.

[0058] Those skilled in the art will understand that the schematic diagram shown in Figure 1 does not constitute a limitation on the embodiments of the present application, and may include more or fewer components than shown in the figure, or a combination of certain components, or different component arrangements. The battery control method in this embodiment is described in detail below.

[0059] FIG2 is a flow chart of a battery control method provided by an embodiment of the present application, which is applicable to but not limited to the photovoltaic storage system of FIG1 , including but not limited to steps S101 to S102 .

[0060] Step S101: Detecting the working status of the solar-storage system and the power level of the energy storage battery 200;

[0061] In some embodiments, the working status of the photovoltaic storage system and the power level of the energy storage battery 200 are detected to achieve real-time monitoring of the photovoltaic storage system and determine whether an abnormality occurs in the photovoltaic storage system, so as to facilitate different control strategies for the battery according to different abnormal conditions of the photovoltaic storage system.

[0062] Step S102: When the triggering condition of the battery sleep strategy is met, the energy storage battery 200 is controlled to enter the sleep mode.

[0063] In some embodiments, when the triggering conditions of the battery dormancy strategy are met, the energy storage battery 200 is directly controlled to enter the dormancy mode, the charging and discharging process of the energy storage battery 200 is stopped, and the self-discharge rate of the battery is reduced, thereby extending the battery life and avoiding further consumption of battery power.

[0064] In some embodiments, the triggering condition of the battery hibernation policy includes at least one of the following:

[0065] The time the photovoltaic storage system is in the standby state is longer than the first time, indicating that the photovoltaic storage system has not been started for a long time. However, during the long period of time when the photovoltaic storage system is not started, the battery will continue to consume energy, resulting in energy waste. Moreover, if the battery is always in the working state, it may cause overcharging or over-discharging, thereby damaging the battery performance and even causing safety problems. In this case, it is necessary to control the energy storage battery 200 to enter the sleep mode, thereby slowing down the natural discharge speed of the energy storage battery 200 and extending the life of the energy storage battery 200.

[0066] It should be noted that the first duration can be adjusted according to the needs of the user. For example, the first duration can be set to one hour, two hours, three hours, etc. This embodiment does not impose any specific restrictions.

[0067] In off-grid mode, the power level of the energy storage battery 200 is lower than the standby power level or the discharge cut-off power level, indicating that the energy storage battery 200 is in a low power state and no power input from the photovoltaic string 100 is detected. At this time, the power of the energy storage battery 200 cannot be replenished. Over-discharge may cause battery performance degradation or even damage. Therefore, it is necessary to control the energy storage battery 200 to enter a dormant mode to ensure that discharge is stopped in time when the remaining power is low, avoid damage to the battery caused by over-discharge, and thus extend the battery life;

[0068] It should be noted that the standby power and the discharge cut-off power can be set according to the needs of the user, or according to the power size of the energy storage battery 200. For example, if the battery capacity of the energy storage battery 200 is 1000 mAh, the standby power can be set to 500 mAh and the discharge cut-off power can be set to 100 mAh; or, if the battery capacity of the energy storage battery 200 is 1000 mAh, the standby power can be set to 200 mAh and the discharge cut-off power can be set to 50 mAh, and so on. This embodiment does not impose any specific restrictions.

[0069] When the photovoltaic string 100 and / or the energy storage battery 200 fails, causing the photovoltaic storage system to fail to operate normally or fail to provide sufficient power to charge the battery, in the event of a failure, continued use of the battery may cause more serious damage, requiring more expensive repairs or replacements. Controlling the battery to sleep mode helps to suspend battery operation and prevent further expansion of the failure.

[0070] It should be noted that when the photovoltaic string 100 fails, it may be that the photovoltaic string 100 device itself fails, or there is a poor connection between the photovoltaic string 100 and the energy storage battery 200. For example, the photovoltaic string 100 panel is damaged, the contact is poor, the line is faulty, etc., which may cause the photovoltaic string 100 to be unable to generate electricity, or the electricity of the photovoltaic string 100 cannot reach the energy storage battery 200, etc., which means that the battery cannot be replenished, and the energy storage battery 200 needs to be controlled to enter a dormant state; when the energy storage battery 200 fails, it means that there is a connection failure at the battery end or a failure in the body of the energy storage battery 200, for example, the battery body is damaged, the electrolyte leaks, the DC / DC circuit at the battery end fails, etc., resulting in the inability to charge the battery, and the energy storage battery 200 needs to be controlled to enter a dormant state to avoid abnormal discharge of the battery.

[0071] It is understandable that when any one of the photovoltaic string 100 and the energy storage battery 200 fails, it is necessary to control the energy storage battery 200 to enter the sleep mode to realize the judgment of different abnormal situations, improve the accuracy of the judgment of the abnormal state of the photovoltaic storage system, and further extend the life of the energy storage battery 200.

[0072] 3 , which is a flowchart of a specific method for step S102 in FIG. 2 , step S102 may include but is not limited to the following steps S201 to S203 .

[0073] Step S201: In off-grid mode, when the power level of the energy storage battery 200 is lower than the standby power level or the discharge cut-off power level, the energy storage battery 200 stops discharging and detects the power input of the photovoltaic string 100;

[0074] Step S202: When no power input from the photovoltaic string 100 is detected, the photovoltaic storage system is switched to a standby state, and a first power level in the standby state is detected;

[0075] Step S203: When the first power level is lower than the first preset power level, the energy storage battery 200 is controlled to enter a sleep mode.

[0076] In some embodiments, in steps S201 to S203, in the off-grid mode, when the power level of the energy storage battery 200 is lower than the standby power level or the discharge cut-off power level, the energy storage battery 200 is stopped from discharging. By stopping the discharge of the energy storage battery 200, the battery power is prevented from being completely exhausted, and the discharge is ensured to be stopped in time when the remaining power level is low to avoid damage to the battery due to excessive discharge. The power input of the photovoltaic string 100 is detected to determine whether there is power input to the energy storage battery 200. When the power input of the photovoltaic string 100 is not detected, it indicates that the energy storage battery 200 cannot be charged, and it is necessary to switch the photovoltaic storage system to a standby state, thereby saving battery power and extending the battery life. The first power level of the energy storage battery 200 in the standby state is detected. When the first power level is lower than the first preset power level, it indicates that the energy storage battery 200 is still discharging, and it is necessary to control the energy storage battery 200 to enter a sleep mode, so that the battery stops the charging and discharging process, reduces the self-discharge rate of the battery, extends the battery life, and avoids further consumption of the battery power.

[0077] It should be noted that the first preset power can be set according to the needs of the user, for example, 10 mAh, 20 mAh, 30 mAh, etc., and this embodiment does not impose any specific limitation.

[0078] 4 , which is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to step S301 .

[0079] It should be noted that step S301 occurs after stopping the discharge of the energy storage battery 200 and detecting the power input of the photovoltaic string 100 .

[0080] Step S301 : when the power input of the photovoltaic string 100 is detected, the power of the energy storage battery 200 is replenished to a second power level through the power input of the photovoltaic string 100 .

[0081] It should be noted that the second power level is greater than the standby power level or the discharge cut-off power level.

[0082] In some embodiments, when the power input of the photovoltaic string 100 is detected, the power of the energy storage battery 200 can be directly replenished to the second power level through the power input of the photovoltaic string 100 to replenish the power of the energy storage battery 200, ensure that the photovoltaic storage system operates more stably and reliably, and extend the battery life.

[0083] It should be noted that the second power level can be set according to the user's needs and can be greater than the standby power level or the discharge cut-off power level. For example, when the standby power level is 50 mAh, the second power level can be set to 80 mAh, 100 mAh, 120 mAh, etc.; when the discharge cut-off power level is 20 mAh, the second power level can be set to 50 mAh, 70 mAh, etc. This embodiment does not impose any specific restrictions.

[0084] After the power of the energy storage battery 200 is replenished to the second power level through the power input of the photovoltaic string 100, a hysteresis value of the replenishment power can also be set, wherein the hysteresis value can be set according to the needs of the user, and the second power level is greater than the sum of the standby power level and the hysteresis value, or the second power level is greater than the sum of the discharge cut-off power level and the hysteresis value. Setting a suitable replenishment hysteresis value can ensure that the battery always maintains a certain energy storage reserve, so as to quickly respond to load demands when needed, thereby improving the stability and reliability of the system.

[0085] As you can imagine, when load demand increases, the battery will begin releasing stored energy to meet the load. In this case, when the battery charge drops below the second level, the solar-storage system will restart photovoltaic power generation and replenish it to the battery to maintain the battery charge at an appropriate level. By setting an appropriate replenishment differential, frequent charging and discharging can be avoided, reducing the number of battery cycles. It also ensures that the battery always maintains a certain amount of stored energy reserve, allowing for a quick response to load demand when needed, improving system stability and reliability.

[0086] 5 , which is another flow chart of a specific method for step S102 in FIG. 2 , the step S102 may include but is not limited to the following steps S401 to S404 .

[0087] Step S401: In the off-grid mode, when the solar-storage system fails, the solar-storage system is switched to a standby state;

[0088] Step S402: Control the optical storage system to clear the fault, restart the optical storage system, and record the first restart number of the optical storage system;

[0089] Step S403: When the first restart number is greater than the first preset number, a fault detection is performed on the optical storage system;

[0090] Step S404: When a failure of the photovoltaic string 100 and / or the energy storage battery 200 is detected, the energy storage battery 200 is controlled to enter a sleep mode.

[0091] In some embodiments, in steps S401 to S404, in off-grid mode, when a fault occurs in the photovoltaic storage system, the photovoltaic storage system is switched to a standby state so that the photovoltaic storage system is in a low power consumption state. While maintaining the low power consumption state, it can still quickly respond to external signals and resume normal operation. The photovoltaic storage system is then controlled to clear the fault and restart the photovoltaic storage system, thereby eliminating unstable factors in the photovoltaic storage system and restoring the stability of the photovoltaic storage system. The first restart number of the photovoltaic storage system is recorded to facilitate subsequent judgment of the restart number of the photovoltaic storage system. When the first restart number is greater than the first preset number, the photovoltaic storage system is fault detected to determine the fault type of the photovoltaic storage system, so as to facilitate subsequent execution of corresponding control strategies according to different fault types. When a fault is detected in the photovoltaic string 100 or the energy storage battery 200, it means that the photovoltaic string 100 cannot provide electrical energy or the battery cannot be charged, resulting in the photovoltaic storage system being unable to work normally or unable to provide sufficient power to charge the battery. In this case, it is necessary to control the energy storage battery 200 to enter a sleep mode to avoid abnormal battery discharge.

[0092] It is worth noting that when the first restart number is less than or equal to the first preset number, the photovoltaic storage system will continue to be restarted until the first restart number is greater than the first preset number, so that the system can be diagnosed and adjusted, and the system configuration and parameter settings can be optimized to improve the system's energy utilization efficiency and performance.

[0093] It should be noted that the situations in which a photovoltaic storage system fails include but are not limited to a failure of the inverter 300 in the photovoltaic storage system, a failure of the photovoltaic module, a failure of the energy storage battery 200, a connection failure of various components, etc. This embodiment does not impose specific restrictions.

[0094] 6 , which is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following steps S501 to S502 .

[0095] It should be noted that step S501 to step S502 occur after fault detection is performed on the optical storage system.

[0096] Step S501: When it is detected that the inverter 300 has a fault and the photovoltaic string 100 and the energy storage battery 200 have no fault, the power input of the photovoltaic string 100 is detected;

[0097] Step S502 : when the power input of the photovoltaic string 100 is detected and the power level of the energy storage battery 200 is lower than the discharge cut-off power level, the energy storage battery 200 is recharged by the power input of the photovoltaic string 100 .

[0098] In some embodiments, when it is detected that the inverter 300 fails and the photovoltaic string 100 and the energy storage battery 200 do not fail, that is, only the inverter 300 fails in the photovoltaic storage system, the power input of the photovoltaic string 100 is detected to confirm whether there is a photovoltaic string 100 providing power to the energy storage battery 200. When the power input of the photovoltaic string 100 is detected and the power of the energy storage battery 200 is lower than the discharge cut-off power, it means that the energy storage battery 200 needs to be charged, and there is a power input of the photovoltaic string 100 in the photovoltaic storage system to charge the energy storage battery 200. Then, the energy storage battery 200 can be directly replenished through the power input of the photovoltaic string 100 to achieve replenishment of the energy storage battery 200.

[0099] It is worth noting that when the energy storage battery 200 is lower than the discharge cut-off power level and there is power input from the photovoltaic string 100, the photovoltaic discharge at this time is unstable. The photovoltaic power generation of the day can only be fully replenished to the energy storage battery 200 according to the photovoltaic power generation situation until the power input from the photovoltaic string 100 is no longer detected or the energy storage battery 200 is fully charged.

[0100] In some embodiments, when the power input of the photovoltaic string 100 is detected and the power level of the energy storage battery 200 is higher than the discharge cut-off power level, the fault detection of the photovoltaic storage system continues without the need for a power replenishment operation.

[0101] It should be noted that the fault of the inverter 300 may be a switch failure, a capacitor failure, a circuit board damage, an inverter 300 overvoltage, an inverter 300 overcurrent, etc., and this embodiment does not impose any specific restrictions.

[0102] 7 , which is another flow chart of a specific method for step S102 in FIG. 2 , the step S102 may include but is not limited to the following steps S601 to S604 .

[0103] Step S601: In the grid-connected mode, when the solar-storage system fails, the solar-storage system is switched to a standby state;

[0104] Step S602: Control the optical storage system to clear the fault, restart the optical storage system, and record the second restart number of the optical storage system;

[0105] Step S603: When the second restart number is greater than the second preset number, a fault detection is performed on the optical storage system;

[0106] Step S604: When a failure of the photovoltaic string 100 or the energy storage battery 200 is detected, the energy storage battery 200 is controlled to enter a sleep mode.

[0107] In some embodiments, in steps S601 to S604, in the grid-connected mode, when a fault occurs in the photovoltaic storage system, the photovoltaic storage system is switched to a standby state so that the photovoltaic storage system is in a low power consumption state. While maintaining the low power consumption state, the photovoltaic storage system can still quickly respond to external signals and resume normal operation. The photovoltaic storage system is then controlled to clear the fault and restart the photovoltaic storage system, thereby eliminating the unstable factors in the photovoltaic storage system and restoring the stability of the photovoltaic storage system. The second restart number of the photovoltaic storage system is recorded to facilitate subsequent judgment of the restart number of the photovoltaic storage system. When the second restart number is greater than the second preset number, the photovoltaic storage system is fault detected to determine the fault type of the photovoltaic storage system, so as to facilitate subsequent execution of corresponding control strategies according to different fault types. When a fault is detected in the photovoltaic string 100 or the energy storage battery 200, it means that the photovoltaic string 100 cannot provide electrical energy or the battery cannot be charged, resulting in the photovoltaic storage system being unable to work normally or unable to provide sufficient power to charge the battery. In this case, the energy storage battery 200 needs to be controlled to enter a sleep mode to avoid abnormal battery discharge.

[0108] It is worth noting that when the second restart number is less than or equal to the second preset number, the photovoltaic storage system will continue to be restarted until the second restart number is greater than the second preset number, so that the system can be diagnosed and adjusted, and the system configuration and parameter settings can be optimized to improve the system's energy utilization efficiency and performance.

[0109] It should be noted that the situations in which a photovoltaic storage system fails include but are not limited to a failure of the inverter 300 in the photovoltaic storage system, a failure of the photovoltaic module, a failure of the energy storage battery 200, a connection failure of various components, etc. This embodiment does not impose specific restrictions.

[0110] In some embodiments, the solar-powered storage system is typically equipped with fault diagnosis and automatic recovery capabilities. When the system detects a fault, it automatically performs diagnostic analysis and attempts to automatically recover or restart the affected components or subsystems. For example, software can automatically clear corresponding fault flags, automatically identify system faults, and monitor the operating status and performance parameters of various system components in real time, although this embodiment does not impose specific limitations.

[0111] 8 , which is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following steps S701 to S702 .

[0112] It should be noted that step S701 to step S702 occur after fault detection is performed on the optical storage system.

[0113] Step S701: When it is detected that the inverter 300 has a fault and the photovoltaic string 100 and the energy storage battery 200 have not failed, the power input of the photovoltaic string 100 is detected;

[0114] Step S702 : when the power input of the photovoltaic string 100 is detected and the power level of the energy storage battery 200 is lower than the discharge cut-off power level, the energy storage battery 200 is recharged by the power input of the photovoltaic string 100 .

[0115] In some embodiments, in steps S701 to S702, when it is detected that the inverter 300 fails and the photovoltaic string 100 and the energy storage battery 200 do not fail, that is, only the inverter 300 fails in the photovoltaic storage system, the power input of the photovoltaic string 100 is detected to confirm whether there is a photovoltaic string 100 providing power to the energy storage battery 200. When the power input of the photovoltaic string 100 is detected and the power of the energy storage battery 200 is lower than the discharge cut-off power, it indicates that the energy storage battery 200 needs to be charged, and there is a power input of the photovoltaic string 100 in the photovoltaic storage system to charge the energy storage battery 200. In the grid-connected mode, the photovoltaic storage system preferentially charges the energy storage battery 200 through the photovoltaic string 100. Then, the energy storage battery 200 can be directly replenished through the power input of the photovoltaic string 100 to achieve replenishment of the energy storage battery 200.

[0116] It should be noted that when the power level of the energy storage battery 200 is higher than the discharge cut-off power level, the energy storage battery 200 is controlled to enter a dormant state, thereby reducing the working number of the energy storage battery 200 and avoiding further consumption of the battery power. The energy storage battery 200 is then awakened at a fixed time to recharge the energy storage battery 200.

[0117] 9 , which is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following steps S801 .

[0118] It should be noted that step S801 occurs after detecting the power input of the photovoltaic string 100 .

[0119] Step S801: When no power input from the photovoltaic string 100 is detected, the energy storage battery 200 is supplemented with power through the grid.

[0120] In some embodiments, when no power input from the photovoltaic string 100 is detected, it means that there are no photovoltaic components in the photovoltaic storage system or there is no power input to the photovoltaic string 100. In this case, the energy storage battery 200 needs to be replenished through the power grid to replenish the energy storage battery 200, thereby improving the stability of the photovoltaic storage system and further improving the operating efficiency of the photovoltaic storage system.

[0121] Referring to FIG10 , FIG10 is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following steps S901 to S902 .

[0122] It should be noted that step S901 to step S902 occur after the energy storage battery 200 is charged.

[0123] Step S901: replenishing the power of the energy storage battery 200 to a third power level;

[0124] It should be noted that the third power level is greater than the standby power level or the discharge cut-off power level. The third power level can be set according to the user's needs. For example, when the standby power level is 100 mAh, the third power level can be set to 150 mAh, 160 mAh, 200 mAh, etc.; when the discharge cut-off power level is 50 mAh, the second power level can be set to 60 mAh, 70 mAh, etc. This embodiment does not impose any specific restrictions.

[0125] Step S902: Perform fault detection on the solar-storage system after the recharge.

[0126] In steps S901 to S902 of some embodiments, the power of the energy storage battery 200 is replenished to a third power level through the photovoltaic string 100 or the power grid, and then the photovoltaic storage system after replenishment is subjected to fault detection, thereby improving the reliability and stability of the photovoltaic storage system, effectively reducing the risk of serious failure of the photovoltaic storage system, improving the reliability and stability of the photovoltaic storage system, and being able to timely discover potential failures in the photovoltaic storage system to avoid the expansion of failures.

[0127] It should be noted that after the power of the energy storage battery 200 is replenished to the third power level, a hysteresis value for replenishment can also be set, wherein the hysteresis value can be set according to the needs of the user, and the third power level is greater than the sum of the standby power level and the hysteresis value, or the fourth power level is greater than the sum of the discharge cut-off power level and the hysteresis value. Setting a suitable replenishment hysteresis value can ensure that the battery always maintains a certain energy storage reserve, so as to quickly respond to load demands when needed, thereby improving the stability and reliability of the system.

[0128] Referring to FIG11 , FIG11 is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following steps S1001 to S1002 .

[0129] Step S1001: In the grid-connected mode, when the power level of the energy storage battery 200 is lower than the standby power level or the discharge cut-off power level, the energy storage battery 200 stops discharging and detects the power input of the photovoltaic string 100;

[0130] Step S1002 : when the power input of the photovoltaic string 100 is detected, the power of the energy storage battery 200 is replenished to a fourth power level through the power input of the photovoltaic string 100 .

[0131] It should be noted that the fourth power level is greater than the standby power level or the discharge cut-off power level.

[0132] In some embodiments, in steps S1001 to S1002, in the grid-connected mode, when the power level of the energy storage battery 200 is lower than the standby power level or the discharge cut-off power level, the energy storage battery 200 is stopped from discharging. By stopping the discharge of the energy storage battery 200, the battery power is prevented from being completely exhausted, and the discharge is ensured to be stopped in time when the remaining power level is low to avoid damage to the battery due to excessive discharge. The power input of the photovoltaic string 100 is detected to determine whether there is power input to the energy storage battery 200. When the power input of the photovoltaic string 100 is detected, the power level of the energy storage battery 200 is directly replenished to the fourth power level through the power input of the photovoltaic string 100, and the free photovoltaic string 100 is given priority for replenishment, which is economical and saves resources, and can extend the service life of the energy storage battery 200.

[0133] It should be noted that the fourth power level can be set according to the user's needs and can be greater than the standby power level or the discharge cut-off power level. For example, when the standby power level is 70 mAh, the second power level can be set to 80 mAh, 100 mAh, 120 mAh, etc.; when the discharge cut-off power level is 60 mAh, the second power level can be set to 90 mAh, 70 mAh, etc. This embodiment does not impose any specific restrictions.

[0134] After the power of the energy storage battery 200 is replenished to the fourth power level through the power input of the photovoltaic string 100, a hysteresis value for the replenishment power can also be set, wherein the hysteresis value can be set according to the needs of the user, and the fourth power level is greater than the sum of the standby power level and the hysteresis value, or the fourth power level is greater than the sum of the discharge cut-off power level and the hysteresis value. Setting a suitable replenishment hysteresis value can ensure that the battery always maintains a certain energy storage reserve, so as to quickly respond to load demands when needed, thereby improving the stability and reliability of the system.

[0135] Understandably, when load demand increases, the battery will begin to release stored energy to meet the load. In this case, when the battery charge drops below the fourth level, the solar-storage system will restart photovoltaic power generation and replenish it to the battery to maintain the battery charge at an appropriate level. By setting an appropriate replenishment differential, frequent charging and discharging can be avoided, reducing the number of battery cycles. It also ensures that the battery always maintains a certain amount of stored energy reserve, allowing for a quick response to load demand when needed, improving system stability and reliability.

[0136] Referring to FIG12 , FIG12 is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following step S1003 .

[0137] It should be noted that step S1003 occurs after the power input of the photovoltaic string 100 is detected.

[0138] Step S1003: When no power input from the photovoltaic string 100 is detected, the power level of the energy storage battery 200 is replenished to a fourth power level through the power grid.

[0139] In some embodiments, when no power input from the photovoltaic string 100 is detected, the power of the energy storage battery 200 can be replenished to a fourth power level through the power grid to charge the energy storage battery 200, thereby improving the stability of the entire photovoltaic storage system and ensuring that the photovoltaic storage system operates more stably and reliably.

[0140] It should be noted that after the power of the energy storage battery 200 is replenished to the fourth power level through the power grid, the hysteresis value of the replenishment can also be made. The specific means are the same as the operation of replenishing the power hysteresis value after the power of the energy storage battery 200 is replenished to the fourth power level through the power input of the photovoltaic string 100. This implementation will not be repeated here.

[0141] Referring to FIG13 , FIG13 is a flow chart of a battery control method provided by another embodiment of the present application, including but not limited to the following steps S1101 .

[0142] It should be noted that step S1101 occurs after a failure of the photovoltaic string 100 and / or the energy storage battery 200 is detected and the energy storage battery 200 is controlled to enter the sleep mode.

[0143] Step S1101: activating the energy storage battery 200 according to a preset cycle.

[0144] In some embodiments, after a fault in the photovoltaic string 100 and / or the energy storage battery 200 is detected and the energy storage battery 200 is controlled to enter a sleep mode, the energy storage battery 200 is activated according to a preset cycle, wherein the energy storage battery 200 is awakened at a scheduled time, a charging operation is started, etc., thereby extending the service life of the energy storage battery 200 and achieving timely charging of the energy storage battery 200.

[0145] It should be noted that, in the off-grid mode, after a fault is detected in the photovoltaic string 100 and / or the energy storage battery 200 and the energy storage battery 200 is controlled to enter the sleep mode, when the power input of the photovoltaic string 100 is detected again, the energy storage battery 200 is awakened at a scheduled time; in the grid-connected mode, in addition to the photovoltaic string 100 supplying power to the energy storage battery 200, the energy storage battery 200 can also be powered by the power grid. Therefore, the energy storage battery 200 can be directly awakened at a scheduled time.

[0146] It is understandable that the preset period can be set according to the needs of the user, for example, it can be set to activate the energy storage battery 200 every two hours, every four hours, every six hours, etc. This embodiment does not impose any specific restrictions.

[0147] In order to explain the above battery control method more clearly and concisely, a specific example is given below for illustration.

[0148] Example 1:

[0149] Example 1 is a specific description of the battery control method, control device, photovoltaic storage system and storage medium. The battery control method is described in detail below based on the photovoltaic storage system structure in Figure 1.

[0150] The photovoltaic storage system includes a photovoltaic string 100 and an energy storage battery 200. When the photovoltaic storage system is operating off-grid, the abnormal status of the photovoltaic storage system is monitored. When the system is in standby mode, alarms after startup, or failures after startup occur, the entire system needs to be processed.

[0151] In some embodiments, when the system is not started and is in standby mode, the system is in standby mode and has not been started for a long time. The system starts timing T. When the timeout time is greater than the first time length Tstandy (which can be set), the inverter 300 controls the energy storage battery 200 BMS (Battery Management System) to disconnect the output of the energy storage battery 200 and control the energy storage battery 200 to enter a dormant state. When no power input from the photovoltaic string 100 is detected, the photovoltaic storage system is completely powered off.

[0152] It should be noted that when the power input of the photovoltaic string 100 is detected, the photovoltaic storage system continues to remain in the standby state.

[0153] In some embodiments, when an alarm occurs after the system starts normally, for example, the discharge of the energy storage battery 200 falls below the discharge cut-off power SOC1 (settable) alarm or the set backup power SOC2 (settable) alarm, the photovoltaic storage system immediately stops discharging the energy storage battery 200.

[0154] When the power input of the photovoltaic string 100 is detected, the energy storage battery 200 is activated by the photovoltaic string 100 to supplement the power. The photovoltaic storage system supplements the power input of the photovoltaic string 100 to the energy storage battery 200. When the battery power reaches the second power (SOC3), the SOC hysteresis of the supplementary power is performed. The discharge cut-off power SOC3>SOC1+hysteresis value (configurable), or the standby power alarm SOC3>SOC2+hysteresis value (configurable);

[0155] When the power input of the photovoltaic string 100 is not detected, and the power level is lower than the discharge cut-off power SOC1 alarm or lower than the standby power SOC2 alarm, the state of the photovoltaic storage system switches from the alarm state to the standby state. At this time, if the power of the photovoltaic storage battery cannot be replenished, when the power of the photovoltaic storage battery is lower than the set first preset power SOC4 (settable), the inverter 300 controls the energy storage battery 200BMS, disconnects the output of the energy storage battery 200, and completely cuts off the power of the entire photovoltaic storage system.

[0156] In some embodiments, when a fault occurs after the photovoltaic storage system starts normally, the photovoltaic storage system will switch to a standby mode, and then the photovoltaic storage system will try to automatically clear the fault and restart.

[0157] When the number of restarts is greater than a first preset number M (settable), the optical storage system reports a fault and sends it to after-sales personnel for repair.

[0158] It should be noted that, when the number of restarts is less than or equal to the first preset number, the restart operation on the optical storage system continues until the number of restarts is greater than the first preset number.

[0159] If the current fault is only a DC / AC fault in the inverter 300, and the energy storage battery 200 is at low power and there is power input from the photovoltaic string 100, since photovoltaic power generation is unstable at this time, the only option is to replenish the battery with as much photovoltaic power generation as possible on that day according to the photovoltaic power generation situation until there is no photovoltaic power generation or the battery is fully charged.

[0160] If other faults occur, such as a failure of the PV string 100 or the energy storage battery 200, the inverter 300 controls the energy storage battery 200 BMS to disconnect the battery output, causing the energy storage battery 200 to enter a dormant state. Without power input from the PV string 100, the entire PV-storage system loses power. When power input from the PV string 100 is restored, the battery is awakened at a scheduled time. If only the DC / AC power of the inverter 300 fails and the battery capacity falls below the discharge cutoff, a recharge cycle is initiated. This process is repeated until the PV-storage system is repaired.

[0161] Refer to FIG14 , which is a flow chart of a battery control method provided by a specific example of the present application;

[0162] The following are the specific steps for battery control in the off-grid mode of the solar storage system.

[0163] Step S1: Detecting the working status of the solar-storage system and the power level of the energy storage battery 200;

[0164] Step S2: In the off-grid mode, the system is not started in standby mode;

[0165] Step S3: The duration of the solar storage system being in the standby state is greater than the first duration;

[0166] Step S4: disconnecting the output of the energy storage battery 200 and controlling the energy storage battery 200 to enter a dormant state;

[0167] Step S5: determining whether the power input of the photovoltaic string 100 is detected;

[0168] Step S6: When it is detected that there is no power input from the photovoltaic string 100, the photovoltaic storage system is completely powered off;

[0169] Step S7: When power input from the photovoltaic string 100 is detected, the photovoltaic storage system continues to remain in the standby state;

[0170] Step S8: In off-grid mode, an alarm occurs after the system starts normally;

[0171] Step S9: the solar energy storage system immediately stops discharging the energy storage battery 200;

[0172] Step S10: determining whether the power input of the photovoltaic string 100 is detected;

[0173] Step S11: When power input from the photovoltaic string 100 is detected, the energy storage battery 200 is activated to supplement power. The photovoltaic storage system supplements the power input from the photovoltaic string 100 to the energy storage battery 200.

[0174] Step S12: When the energy storage battery 200 is charged to the second power level (SOC3), the SOC hysteresis of the supplementary power is performed, and the discharge cut-off power level SOC3>SOC1+hysteresis value, or the standby power warning level SOC3>SOC2+hysteresis value;

[0175] Step S13: When it is detected that there is no power input from the photovoltaic string 100, the power level is lower than the discharge cut-off SOC1 alarm or lower than the standby power level SOC2 alarm, the state of the photovoltaic storage system is switched from the alarm state to the standby state;

[0176] Step S14: When the power level of the photovoltaic storage battery is lower than the first preset power level SOC4, the inverter 300 controls the energy storage battery 200 BMS to disconnect the output of the energy storage battery 200, so that the entire photovoltaic storage system is completely powered off;

[0177] Step S15: In the off-grid mode, the solar-storage system fails after normal startup;

[0178] Step S16: the solar storage system switches to a standby mode, and then attempts to automatically clear the fault and restart, and records the first restart number of the solar storage system;

[0179] Step S17: Determine whether the first restart number is greater than a first preset number;

[0180] Step S18: When the first restart number is greater than the first preset number, a fault detection is performed on the optical storage system;

[0181] Step S19: Determine whether the current fault is only a DC / AC fault of the inverter 300;

[0182] Step S20: If the current fault is only a DC / AC fault of the inverter 300, determine whether the power level of the energy storage battery 200 is lower than the discharge cut-off power level;

[0183] Step S21: When the current fault is only a DC / AC fault of the inverter 300, the power level of the energy storage battery 200 is lower than the discharge cut-off power level, and there is power input from the photovoltaic string 100, the energy storage battery 200 is charged through the photovoltaic string 100;

[0184] Step S22: If other faults occur, the inverter 300 controls the BMS of the energy storage battery 200 to disconnect the battery output, and the energy storage battery 200 enters a dormant state;

[0185] Step S23: When there is power input from the photovoltaic string 100, the energy storage battery 200 is awakened at a scheduled time.

[0186] In some embodiments, different control strategies are implemented for the energy storage battery 200, prioritizing timely recharging of the energy storage battery 200 with the free photovoltaic strings 100 while taking into account economic efficiency, thereby extending the battery life. When the photovoltaic storage system cannot recharge, the dormant battery is used to maintain power.

[0187] Example 2:

[0188] Example 2 is a specific description of the battery control method, control device, photovoltaic storage system and storage medium. The battery control method is described in detail below based on the photovoltaic storage system structure in Figure 1.

[0189] The photovoltaic storage system includes a photovoltaic string 100 and an energy storage battery 200. When the photovoltaic storage system is connected to the grid, the abnormal status of the photovoltaic storage system is monitored. When the system is in standby mode, alarms after startup, or failures after startup occur, the entire system needs to be processed.

[0190] In some embodiments, when the system is on standby for a long time without starting, the system starts timing T. When the timeout time is greater than Tstandy (settable), the inverter 300 controls the battery BMS, disconnects the battery output, and the battery enters a dormant state.

[0191] In some embodiments, when an alarm occurs after the system starts normally, for example, the battery discharge falls below the discharge cut-off power SOC1 (settable) alarm or the set standby power SOC2 (settable) alarm, the system immediately stops battery discharge.

[0192] When the power input of the photovoltaic string 100 is detected, the energy storage battery 200 is activated to supplement the power. The photovoltaic storage system supplements the power input of the photovoltaic string 100 to the energy storage battery 200. When the power of the energy storage battery 200 reaches the fourth power level (SOC6), the SOC hysteresis of the supplementary power is performed. The discharge cut-off power level SOC6>SOC1+hysteresis value (configurable), or the standby power alarm SOC6>SOC2+hysteresis value (configurable);

[0193] When no power input from the photovoltaic string 100 is detected, the grid is used to perform the same power replenishment operation, that is, the grid is used to start the energy storage battery 200 for power replenishment. The photovoltaic storage system supplements the grid power input to the energy storage battery 200. When the energy storage battery 200 is charged to the fourth power level (SOC6), the SOC hysteresis of the power replenishment is performed, and the discharge cut-off power level SOC6>SOC1+hysteresis value (configurable), or the standby power alarm SOC6>SOC2+hysteresis value (configurable);

[0194] In some embodiments, when the photovoltaic storage system fails after startup, the photovoltaic storage system will switch to standby mode, and then try to automatically clear the fault and restart, recording the second restart number of the photovoltaic storage system. When the second restart number is greater than the second preset number M (settable), the photovoltaic storage system reports the fault and pushes it to after-sales personnel for repair.

[0195] When the photovoltaic storage system fault persists and has not been repaired, such as only the DC / AC fault of the inverter 300, when the power of the energy storage battery 200 is lower than the discharge cut-off power SOC1 (settable), considering the economy, the photovoltaic string 100 is preferentially used for power replenishment, and the grid is used for power replenishment only when there is no photovoltaic string 100; when the power of the energy storage battery 200 is not lower than the discharge cut-off power SOC1 (settable), the inverter 300 controls the BMS of the energy storage battery 200 to disconnect the battery output, and the energy storage battery 200 enters a dormant state, and the energy storage battery needs to be awakened periodically.

[0196] It should be noted that after the energy storage battery 200 is replenished with power through the photovoltaic string 100 or the power grid, the power of the energy storage battery 200 is replenished to the third power level (SOC5). When the power of the energy storage battery 200 is charged to the third power level (SOC5), the SOC hysteresis of the replenishment is performed, and the discharge cut-off power SOC5>SOC1+hysteresis value (settable), or the standby power alarm SOC5>SOC2+hysteresis value (settable), and then the photovoltaic storage system after replenishment is fault detected to determine whether other faults occur.

[0197] When only the DC / AC fault of the inverter 300 occurs, the energy storage battery 200 continues to be replenished until it is repaired. By continuously replenishing the battery, the service life of the battery can be greatly extended.

[0198] Refer to FIG15 , which is a flow chart of a battery control method provided by a specific example of the present application;

[0199] The following are the specific steps for battery control in the grid-connected mode of the photovoltaic storage system.

[0200] Step S25: Detecting the working status of the solar energy storage system and the power level of the energy storage battery 200;

[0201] Step S26: In the grid-connected mode, the system is not started in standby mode;

[0202] Step S27: The duration of the solar storage system being in the standby state is greater than the first duration;

[0203] Step S28: disconnecting the output of the energy storage battery 200 and controlling the energy storage battery 200 to enter a dormant state;

[0204] Step S29: In the grid-connected mode, an alarm occurs after the system starts normally;

[0205] Step S30: the solar energy storage system immediately stops discharging the energy storage battery 200;

[0206] Step S31: determining whether the power input of the photovoltaic string 100 is detected;

[0207] Step S32: When power input from the photovoltaic string 100 is detected, the photovoltaic string 100 is started to supplement power for the energy storage battery 200, and the photovoltaic storage system supplements the power input from the photovoltaic string 100 to the energy storage battery 200;

[0208] Step S33: When no power input from the photovoltaic string 100 is detected, the photovoltaic storage system supplements the power input from the grid to the energy storage battery 200;

[0209] Step S34: When the energy storage battery 200 is charged to the fourth power level (SOC6), the SOC hysteresis of the supplementary power is performed, and the discharge cut-off power level SOC6>SOC1+hysteresis value, or the standby power warning power level SOC6>SOC2+hysteresis value;

[0210] Step S35: In the grid-connected mode, the solar-storage system fails after normal startup;

[0211] Step S36: the solar storage system switches to standby mode, and then attempts to automatically clear the fault and restart, and records the second restart number of the solar storage system;

[0212] Step S37: Determine whether the second restart number is greater than a second preset number;

[0213] Step S38: When the second restart number is greater than the second preset number, a fault detection is performed on the optical storage system;

[0214] Step S39: determining whether the current fault is only a DC / AC fault of the inverter 300;

[0215] Step S40: If the current fault is only a DC / AC fault of the inverter 300, determine whether the power level of the energy storage battery 200 is lower than the discharge cut-off power level;

[0216] Step S41: determining whether the power input of the photovoltaic string 100 is detected;

[0217] Step S42: If the current fault is only a DC / AC fault of the inverter 300, the power level of the energy storage battery 200 is lower than the discharge cut-off power level, and there is power input from the photovoltaic string 100, the energy storage battery 200 is charged through the photovoltaic string 100;

[0218] Step S43: When no power input from the photovoltaic string 100 is detected, the energy storage battery 200 is supplemented with power through the grid;

[0219] Step S44: The energy storage battery 200 is charged to a third level (SOC5). When the energy storage battery 200 is charged to the third level (SOC5), a SOC hysteresis is performed for charging, where the discharge cut-off level SOC5 is greater than SOC1 + hysteresis value (settable), or the standby power warning level SOC5 is greater than SOC2 + hysteresis value (settable).

[0220] Step S45: performing fault detection on the solar-storage system after the recharge;

[0221] Step S46: When the power level of the energy storage battery 200 is higher than the discharge cut-off power level or other faults occur, the inverter 300 controls the BMS of the energy storage battery 200 to disconnect the energy storage battery output, and the energy storage battery 200 enters a dormant state and needs to be awakened regularly;

[0222] Step S47: Wake up the energy storage battery 200 at a scheduled time.

[0223] In some embodiments, this example can implement different battery control strategies based on the different abnormal conditions of the solar-storage system, maintaining battery power as much as possible. This can also maintain battery power for equipment that is out of service for extended periods, preventing abnormal battery drain. Free photovoltaic power replenishment is prioritized, achieving both economic benefits and extending the life of the energy storage battery 200.

[0224] As shown in FIG16 , FIG16 is a schematic diagram of a control device provided in one embodiment of the present application.

[0225] The control device 1000 of the embodiment of the present application includes one or more processors 1001 and a memory 1002 . FIG16 takes one processor 1001 and one memory 1002 as an example.

[0226] The processor 1001 and the memory 1002 may be connected via a bus or other means. FIG16 takes the bus connection as an example.

[0227] The memory 1002 is a non-transient computer-readable storage medium that can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory 1002 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory 1002 may optionally include a memory 1002 remotely located relative to the processor 1001, and these remote memories may be connected to the control device 1000 via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0228] Those skilled in the art will understand that the device structure shown in FIG16 does not constitute a limitation on the control device 1000 , and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0229] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network nodes. Some or all of the modules may be selected based on actual needs to achieve the objectives of this embodiment.

[0230] The memory, as a non-transient computer-readable storage medium, can be used to store non-transient software programs and non-transient computer executable programs. In addition, the memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0231] The non-transient software program and instructions required to implement the battery control method of the above embodiment are stored in the memory, and when executed by the processor, the above embodiment is executed.

[0232] It is worth noting that this embodiment also provides a photovoltaic storage system, which includes a control device as shown in Figure 16. Since the photovoltaic storage system of the embodiment of the present application has the control device of the above embodiment, and the control device of the above embodiment can execute the battery control method of the above embodiment, the specific implementation methods and technical effects of the photovoltaic storage system of the embodiment of the present application can refer to the specific implementation methods and technical effects of the battery control method of any of the above embodiments.

[0233] The device embodiments or system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate, i.e., they may be located in one place or distributed across multiple network units. Some or all of the modules may be selected based on actual needs to achieve the objectives of the present embodiments.

[0234] In addition, an embodiment of the present application further provides a computer-readable storage medium, which stores computer-executable instructions, and the computer-executable instructions are executed by a processor or controller.

[0235] Those skilled in the art will appreciate that all or some of the steps and systems in the disclosed method above can be implemented as software, firmware, hardware, and appropriate combinations thereof. Some physical components or all physical components can be implemented as software executed by a processor, such as a central processing unit, a digital signal processor, or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include a computer-readable storage medium (or non-transitory medium) and a communication medium (or temporary medium). As known to those skilled in the art, the term computer-readable storage medium is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data) and is volatile and non-volatile, removable, and non-removable. Computer-readable storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technology, CD-ROM, digital versatile disk (DVD), or other optical disk storage, magnetic cassette, magnetic tape, disk storage, or other magnetic storage device, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0236] The above is a specific description of the preferred implementation of the present application, but the present application is not limited to the above implementation mode. Technical personnel familiar with the field can also make various equivalent modifications or substitutions without violating the spirit of the present application. These equivalent modifications or substitutions are all included in the scope defined by the present application.

Claims

1. A battery control method, applied to a photovoltaic storage system, wherein the photovoltaic storage system includes a photovoltaic string and an energy storage battery, and the method comprises: Detecting the working state of the photovoltaic storage system and the power level of the energy storage battery; and When the triggering condition of the battery dormancy strategy is met, controlling the energy storage battery to enter a dormancy mode; The triggering condition of the battery sleep strategy includes at least one of the following: The duration of the solar energy storage system being in the standby state is greater than the first duration; In the off-grid mode, the power level of the energy storage battery is lower than the standby power level or the discharge cut-off power level, and no power input from the photovoltaic string is detected; and The photovoltaic string and / or the energy storage battery fails.

2. The battery control method according to claim 1, wherein: When the triggering condition of the battery dormancy strategy is met, controlling the energy storage battery to enter the dormancy mode includes: In off-grid mode, when the power of the energy storage battery is lower than the standby power or the discharge cut-off power, the energy storage battery is stopped from discharging and the power supply input of the photovoltaic string is detected; When no power input of the photovoltaic string is detected, the photovoltaic storage system is switched to a standby state, and a first power quantity in the standby state is detected; and When the first power level is lower than a first preset power level, the energy storage battery is controlled to enter a sleep mode.

3. The battery control method according to claim 2, after stopping the discharge of the energy storage battery and detecting the power supply input of the photovoltaic string, further comprises: When the power supply input of the photovoltaic string is detected, the power supply input of the photovoltaic string is used to replenish the power of the energy storage battery to a second power, wherein the second power is greater than the standby power or the discharge cut-off power.

4. The battery control method according to any one of claims 1 to 3, wherein: When the triggering condition of the battery dormancy strategy is met, controlling the energy storage battery to enter the dormancy mode also includes: In the off-grid mode, when the photovoltaic storage system fails, the photovoltaic storage system is switched to a standby state; Controlling the optical storage system to clear a fault, restart the optical storage system, and record a first restart number of the optical storage system; When the first restart number is greater than a first preset number, performing fault detection on the optical storage system; and When a failure of the photovoltaic string and / or the energy storage battery is detected, the energy storage battery is controlled to enter a sleep mode.

5. The battery control method according to claim 4, after performing fault detection on the photovoltaic storage system, further comprising: When it is detected that the inverter fails and the photovoltaic string and the energy storage battery do not fail, detecting the power supply input of the photovoltaic string; as well as When the power supply input of the photovoltaic string is detected and the power level of the energy storage battery is lower than the discharge cut-off power level, the energy storage battery is supplemented with power through the power supply input of the photovoltaic string.

6. The battery control method according to any one of claims 1 to 5, wherein: When the current working state of the photovoltaic storage system meets the triggering condition of the battery dormancy strategy, controlling the energy storage battery to enter the dormancy mode also includes: In the grid-connected mode, when the photovoltaic storage system fails, the photovoltaic storage system is switched to a standby state; Controlling the optical storage system to clear a fault, restart the optical storage system, and record a second restart number of the optical storage system; When the second restart number is greater than a second preset number, performing fault detection on the optical storage system; and When a failure of the photovoltaic string and / or the energy storage battery is detected, the energy storage battery is controlled to enter a sleep mode.

7. The battery control method according to claim 6, after performing fault detection on the photovoltaic storage system, further comprising: When it is detected that the inverter fails and the photovoltaic string and the energy storage battery do not fail, detecting the power supply input of the photovoltaic string; as well as When the power supply input of the photovoltaic string is detected and the power level of the energy storage battery is lower than the discharge cut-off power level, the energy storage battery is supplemented with power through the power supply input of the photovoltaic string.

8. The battery control method according to claim 7, after detecting the power supply input of the photovoltaic string, further comprising: When the power input of the photovoltaic string is not detected, the energy storage battery is supplemented with power through the power grid.

9. The battery control method according to claim 7 or 8, after the energy storage battery is charged, further comprising: replenishing the power of the energy storage battery to a third power, wherein the third power is greater than the standby power or the discharge cut-off power; and Perform fault detection on the photovoltaic storage system after recharging.

10. The battery control method according to any one of claims 1 to 9, further comprising: In the grid-connected mode, when the power of the energy storage battery is lower than the standby power or the discharge cut-off power, the energy storage battery is stopped from discharging and the power supply input of the photovoltaic string is detected; as well as When the power supply input of the photovoltaic string is detected, the power supply input of the photovoltaic string is used to replenish the power of the energy storage battery to a fourth power, wherein the fourth power is greater than the standby power or the discharge cut-off power.

11. The battery control method according to claim 10, after stopping the discharge of the energy storage battery and detecting the power supply input of the photovoltaic string, further comprises: When no power input from the photovoltaic string is detected, the power level of the energy storage battery is replenished to a fourth power level through the power grid.

12. The battery control method according to any one of claims 4 to 11, after detecting a failure of the photovoltaic string and / or the energy storage battery and controlling the energy storage battery to enter a sleep mode, further comprising: The energy storage battery is activated according to a preset cycle.

13. A control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the battery control method according to any one of claims 1 to 12 when executing the computer program.

14. A photovoltaic storage system, comprising the control device according to claim 13.

15. A computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are used to enable a computer to execute the battery control method according to any one of claims 1 to 12.

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