Energy storage system, fault control method and device and medium

Abstract

The invention discloses an energy storage system, a fault control method and device and a medium. The fault control method comprises the following steps: acquiring mark information and battery working parameters of all energy storage batteries; grouping all the battery working parameters according to the mark information to obtain a plurality of battery parameter groups; determining an abnormal parameter group according to a preset fault parameter threshold and all battery working parameters in each battery parameter group; determining a target inverter according to the mark information of the energy storage battery corresponding to the abnormal parameter group; and controlling the working state of the target inverter according to the working parameters of each battery in the abnormal parameter group. The method can effectively reduce the influence of the abnormality of the energy storage battery on the power supply of the energy storage system.

Description

Technical Field

[0001] The present invention relates to the technical field of battery energy storage, and particularly relates to an energy storage system, a fault control method, a device and a medium. Background Art

[0002] In the new energy technology architecture, the battery energy storage system, as a key carrier for power energy management, has been deeply integrated into the modern industrial and commercial energy network. During the long-term use of the battery energy storage system, the energy storage batteries in the battery energy storage system may fail due to various factors. In the related art, when a failure occurs in the battery energy storage system, the main method is to directly shut down the system, but this method will affect the power supply of the battery energy storage system. Summary of the Invention

[0003] Embodiments of the present invention provide an energy storage system, a fault control method, a device and a medium, which can effectively reduce the impact of abnormal energy storage batteries on the power supply of the energy storage system.

[0004] In a first aspect, an embodiment of the present invention provides a fault control method for an energy storage system. The energy storage system includes a control module, a plurality of energy storage batteries and a plurality of inverters. The inverter is connected to at least one of the energy storage batteries, and the control module is respectively connected to all the energy storage batteries and all the inverters. The fault control method is applied to the control module, and the fault control method includes:

[0005] Obtain the marking information and battery operating parameters of all the energy storage batteries;

[0006] Group all the battery operating parameters according to the marking information to obtain a plurality of battery parameter groups;

[0007] Determine an abnormal parameter group according to a preset fault parameter threshold and all the battery operating parameters in each battery parameter group;

[0008] Determine a target inverter according to the marking information of the energy storage battery corresponding to the abnormal parameter group;

[0009] Control the operating state of the target inverter according to each battery operating parameter in the abnormal parameter group.

[0010] The fault control method of the energy storage system according to the embodiment of the first aspect of the present invention has at least the following beneficial effects: Since the marking information of the energy storage batteries connected to the same inverter is the same, all battery operating parameters can be grouped according to the marking information, and the battery operating parameters with the same marking information can be divided into the same battery parameter group, that is, the inverters connected to the energy storage batteries corresponding to the same battery parameter group are the same. After determining the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each battery parameter group, because each battery parameter group corresponds to an inverter, the target inverter can be determined according to the marking information of the energy storage battery corresponding to the abnormal parameter group, where the target inverter means that there is an abnormality in the energy storage battery connected to the inverter. Finally, the operating state of the target inverter is controlled according to each battery operating parameter in the abnormal parameter group. The technical solution of the present invention only adjusts the inverter corresponding to the abnormal energy storage battery and will not affect the operating states of other inverters. Therefore, compared with the related art, which uses a direct shutdown method for processing, the present application can effectively reduce the impact of the abnormal energy storage battery on the power supply of the energy storage system.

[0011] In the fault control method of the energy storage system provided by the embodiment of the present invention, there are multiple types of the marking information, the number of types of the marking information is equal to the number of the inverters, and different types of the marking information indicate that the inverters connected to the corresponding energy storage batteries are different. The grouping of all the battery operating parameters according to the marking information to obtain a plurality of battery parameter groups includes:

[0012] Classifying the energy storage batteries corresponding to the same type of the marking information into the same battery cluster, so as to divide all the energy storage batteries into a plurality of battery clusters;

[0013] Combining the battery operating parameters corresponding to the same battery cluster to obtain the battery parameter groups of each battery cluster.

[0014] In the fault control method of the energy storage system provided by the embodiment of the present invention, the determination of the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each battery parameter group includes:

[0015] For each battery parameter group, determining the maximum value of all the battery operating parameters in the current battery parameter group as the first detection parameter;

[0016] Determining the abnormal parameter group according to the preset fault parameter threshold and the first detection parameter corresponding to each battery parameter group.

[0017] In the fault control method of the energy storage system provided by the embodiment of the present invention, the controlling the operating state of the target inverter according to each of the battery operating parameters in the abnormal parameter group includes:

[0018] Determining a fault level according to the difference between the first detection parameter and the fault parameter threshold;

[0019] Controlling the operating state of the target inverter according to the fault level.

[0020] In the fault control method of the energy storage system provided by the embodiment of the present invention, the controlling the operating state of the target inverter according to each of the battery operating parameters in the abnormal parameter group includes:

[0021] Comparing all the battery operating parameters of the abnormal parameter group with the fault parameter threshold in terms of numerical magnitude to determine a fault level;

[0022] Controlling the operating state of the target inverter according to the fault level.

[0023] In the fault control method of the energy storage system provided by the embodiment of the present invention, the comparing all the battery operating parameters of the abnormal parameter group with the fault parameter threshold in terms of numerical magnitude to determine a fault level includes:

[0024] Determining the battery operating parameters in the abnormal parameter group that are greater than the fault parameter threshold as abnormal operating parameters;

[0025] Determining a fault level according to the number of the abnormal operating parameters.

[0026] In the fault control method of the energy storage system provided by the embodiment of the present invention, the controlling the operating state of the target inverter according to the fault level includes:

[0027] When the fault level is at the first fault level, adjusting the output power of the target inverter according to the abnormal operating parameters;

[0028] When the fault level is at the second fault level, controlling the target inverter to stop operating.

[0029] In the fault control method of the energy storage system provided by the embodiment of the present invention, a disconnect switch is further connected between the inverter and the energy storage battery, and the fault control method further includes:

[0030] When the fault level reaches the second fault level, controlling the target inverter to stop operating and turning off the disconnect switch.

[0031] In the fault control method of the energy storage system provided by the embodiment of the present invention, the battery operating parameters include the battery temperature, the fault parameter threshold includes the temperature threshold, the energy storage system further includes a battery cooling device, the battery cooling device includes a heat exchange pipeline for cooling the energy storage battery, and the fault control method further includes:

[0032] When any one of the battery temperatures in the abnormal parameter group is greater than or equal to the temperature threshold, perform a boosting control on the operating power of the battery cooling device;

[0033] When the duration of the battery cooling device operating at the boosted operating power reaches a first preset duration, re-acquire the battery temperature of the energy storage battery corresponding to the abnormal parameter group;

[0034] Control the operating state of the target inverter according to the re-acquired battery temperature and the temperature threshold.

[0035] In a second aspect, an embodiment of the present invention provides an operation control device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and the processor executes the program to implement the fault control method as described in the first aspect.

[0036] According to the operation control device provided by the embodiment of the present invention, it has at least the following beneficial effects: Since the marking information of the energy storage batteries connected to the same inverter is the same, by grouping all the battery operating parameters according to the marking information, the battery operating parameters with the same marking information can be divided into the same battery parameter group, that is, the inverters connected to the energy storage batteries corresponding to the same battery parameter group are the same. After determining the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each battery parameter group, because each battery parameter group corresponds to an inverter, therefore, the target inverter can be determined according to the marking information of the energy storage battery corresponding to the abnormal parameter group, where the target inverter means that there is an abnormality in the energy storage battery connected to this inverter. Finally, control the operating state of the target inverter according to each battery operating parameter in the abnormal parameter group. The technical solution of the present invention only adjusts the inverter corresponding to the abnormal energy storage battery and will not affect the operating states of other inverters. Therefore, compared with the related art, which uses a direct shutdown method for processing, the present application can effectively reduce the impact of the abnormal energy storage battery on the power supply of the energy storage system.

[0037] In a third aspect, an embodiment of the present invention provides an energy storage system, including the operation control device as described in the second aspect embodiment above.

[0038] The energy storage system provided by the embodiments of the present invention has at least the following beneficial effects: Since the marking information of the energy storage batteries connected to the same inverter is the same, all battery operating parameters can be grouped according to the marking information, and the battery operating parameters with the same marking information can be divided into the same battery parameter group, that is, the inverters connected to the corresponding energy storage batteries within the same battery parameter group are the same. After determining the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each battery parameter group, since each battery parameter group corresponds to an inverter, the target inverter can be determined according to the marking information of the energy storage battery corresponding to the abnormal parameter group, where the target inverter means that there is an abnormality in the energy storage battery connected to the inverter. Finally, the operating state of the target inverter is controlled according to each battery operating parameter in the abnormal parameter group. The technical solution of the present invention only adjusts the inverter corresponding to the abnormal energy storage battery and will not affect the operating states of other inverters. Therefore, compared with the related art where direct shutdown is used for processing, this application can effectively reduce the impact of abnormal energy storage batteries on the power supply of the energy storage system.

[0039] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute the fault control method described in the first aspect embodiment above.

[0040] The computer-readable storage medium provided by the embodiments of the present invention has at least the following effects: Since the marking information of the energy storage batteries connected to the same inverter is the same, all battery operating parameters can be grouped according to the marking information, and the battery operating parameters with the same marking information can be divided into the same battery parameter group, that is, the inverters connected to the corresponding energy storage batteries within the same battery parameter group are the same. After determining the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each battery parameter group, since each battery parameter group corresponds to an inverter, the target inverter can be determined according to the marking information of the energy storage battery corresponding to the abnormal parameter group, where the target inverter means that there is an abnormality in the energy storage battery connected to the inverter. Finally, the operating state of the target inverter is controlled according to each battery operating parameter in the abnormal parameter group. The technical solution of the present invention only adjusts the inverter corresponding to the abnormal energy storage battery and will not affect the operating states of other inverters. Therefore, compared with the related art where direct shutdown is used for processing, this application can effectively reduce the impact of abnormal energy storage batteries on the power supply of the energy storage system.

[0041] Other features and advantages of the present invention will be set forth in the following description, and in part will be obvious from the description, or may be learned by practice of the present invention. The objectives and other advantages of the present invention may be realized and attained by the structure particularly pointed out in the specification, claims as well as the drawings. Description of the Drawings

[0042] The drawings are used to provide a further understanding of the technical solution of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the technical solution of the present invention, and do not constitute a limitation to the technical solution of the present invention.

[0043] Figure 1 Structural schematic diagram of the energy storage system provided for the embodiment of the present invention;

[0044] Figure 2 Flowchart of the fault control method for the energy storage system provided for the embodiment of the present invention;

[0045] Figure 3 For Figure 2 Specific flowchart of step S200 in

[0046] Figure 4 For Figure 2 Specific flowchart of step S300 in

[0047] Figure 5 For Figure 2 Specific flowchart of step S500 in

[0048] Figure 6 Flowchart of the fault control method for the energy storage system provided for another embodiment of the present invention;

[0049] Figure 7 Structural schematic diagram of the operation control device provided for the embodiment of the present invention. Detailed Description of the Invention

[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0051] It can be understood that although the functional modules are divided in the device schematic diagram and the logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order from the module division in the device or the order in the flowchart. Terms such as "first" and "second" in the specification, claims or the above-mentioned drawings are used to distinguish similar objects and do not necessarily have to be used to describe a specific order or sequence.

[0052] In the new energy technology architecture, the battery energy storage system, as a key carrier for power energy management, has been deeply integrated into the modern industrial and commercial energy network. During the long-term use of the battery energy storage system, the energy storage batteries in the battery energy storage system may fail due to various factors. In related technologies, when the battery energy storage system fails, the main method is to directly shut down, but this method will affect the power supply of the battery energy storage system.

[0053] Based on this, the present invention provides an energy storage system, a fault control method, a device, and a medium. Since the marking information of the energy storage batteries connected to the same inverter is the same, all battery operating parameters can be grouped according to the marking information. The battery operating parameters with the same marking information can be divided into the same battery parameter group, that is, the inverters connected to the energy storage batteries corresponding to the same battery parameter group are the same. After determining the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each battery parameter group, because each battery parameter group corresponds to an inverter, the target inverter can be determined according to the marking information of the energy storage battery corresponding to the abnormal parameter group, where the target inverter means that there is an abnormality in the energy storage battery connected to this inverter. Finally, the operating state of the target inverter is controlled according to the various battery operating parameters in the abnormal parameter group. The technical solution of the present invention only adjusts the inverter corresponding to the abnormal energy storage battery and will not affect the operating states of other inverters. Therefore, compared with the related technologies that use the method of directly shutting down for processing, the present application can effectively reduce the impact of the abnormal energy storage battery on the power supply of the energy storage system.

[0054] The following further elaborates on the embodiments of the present invention with reference to the accompanying drawings.

[0055] Refer to Figure 1 , Figure 1 which is the structural schematic diagram of the energy storage system provided by the embodiment of the present invention.

[0056] It can be understood that the energy storage system includes a control module, a plurality of energy storage batteries, and a plurality of inverters. Each inverter is connected to at least one energy storage battery. The inverter is used to convert the direct current output by the energy storage battery into alternating current. When an inverter is connected to a plurality of energy storage batteries, the plurality of energy storage batteries connected to the inverter are connected in series in sequence. The control module is respectively connected to all the energy storage batteries so that the control module can obtain the battery operating parameters of all the energy storage batteries. The control module is also connected to all the inverters so that the control module can control the operating state of the inverters. Therefore, the control module can judge whether there is a fault in the energy storage battery according to the battery operating parameters of the energy storage battery. If there is a fault in the energy storage battery, it can control the operating state of the inverter connected to the faulty energy storage battery. Since the control module can independently control the operating state of each inverter, when the control module adjusts the operating state of the inverter connected to the faulty energy storage battery, other inverters can still continuously supply power to external devices and will not affect the operating state of other inverters, thereby reducing the impact of the faulty energy storage battery on the energy storage system.

[0057] It should be noted that a disconnect switch is also connected between the DC side of the inverter and the energy storage battery. When the disconnect switch is in the off state, the energy storage battery is disconnected from the DC side of the inverter. When there is a fault in the energy storage battery, the disconnect switch can be turned off to prevent the faulty energy storage battery from damaging the inverter connected to the faulty energy storage battery. For example, a plurality of energy storage batteries are connected in series to the inverter, and the plurality of energy storage batteries are connected in series to form a battery cluster. The disconnect switch is arranged between the battery cluster and the inverter. Among them, the disconnect switch can be a relay, and the control module is connected to the control terminal of the relay.

[0058] It should be noted that the energy storage system is generally arranged in a box, that is, the energy storage battery, the inverter, and the disconnect switch are all arranged in the box. The humid gas in the external environment may enter the box, resulting in an increase in the air humidity in the box. As the air humidity in the box increases, the risk of short-circuit failure of the energy storage battery will increase. Therefore, the energy storage system also includes a dehumidification device. The dehumidification device includes a dehumidifier and a humidity sensor. The dehumidifier is used to reduce the air humidity in the box. The control module is respectively connected to the dehumidification device. For example, when the air humidity in the box reaches the preset dehumidification threshold, the control module can control the dehumidifier to turn on, thereby reducing the air humidity in the box and further reducing the risk of short-circuit failure of the energy storage battery.

[0059] It should be noted that due to the internal resistance of the energy storage battery, during the operation of the energy storage battery, as the operation time of the energy storage battery increases, the battery temperature of the energy storage battery will continuously rise. Therefore, the energy storage system further includes a battery cooling device. The battery cooling device includes a heat exchange pipeline for cooling the energy storage battery. The heat exchange pipeline is in contact with the surfaces of each energy storage battery. When the refrigerant flows through the heat exchange pipeline, it can absorb the heat generated by the energy storage battery, thereby reducing the battery temperature of the energy storage battery. The control module is connected to the battery cooling device so that the control module can control the working power of the battery cooling device. Among them, the greater the working power of the battery cooling device, the stronger the refrigeration capacity of the battery cooling device.

[0060] It should be noted that when the energy storage battery catches fire, a large amount of carbon dioxide gas will be generated during the combustion process, that is, the concentration of carbon dioxide in the box will rise. Therefore, the energy storage system further includes a fire protection device. The fire protection device includes a carbon dioxide concentration sensor and a fire extinguishing device. The control module is respectively connected to the carbon dioxide concentration sensor and the fire extinguishing device. The fire extinguishing device is used to extinguish the energy storage battery when the energy storage battery catches fire. For example, when the concentration of carbon dioxide in the box reaches the preset carbon dioxide concentration threshold, the control module can control the fire extinguishing device to start and extinguish the energy storage battery in time.

[0061] In a first aspect, referring to Figure 2 , Figure 2 is a flowchart of a fault control method for an energy storage system provided by an embodiment of the present invention. This fault control method for the energy storage system can be applied to the above Figure 1 energy storage system. This fault control method includes but is not limited to the following steps:

[0062] Step S100, obtain the marking information and battery operating parameters of all energy storage batteries;

[0063] Step S200, group all battery operating parameters according to the marking information to obtain multiple battery parameter groups;

[0064] Step S300, determine the abnormal parameter group according to the preset fault parameter threshold and all battery operating parameters in each battery parameter group;

[0065] Step S400, determine the target inverter according to the marking information of the energy storage battery corresponding to the abnormal parameter group;

[0066] Step S500, control the operating state of the target inverter according to each battery operating parameter in the abnormal parameter group.

[0067] It can be understood that in the initial state, the control module does not know the connection relationship between each energy storage battery and each inverter. Therefore, it can obtain the marking information and battery operating parameters of all energy storage batteries. Among them, the marking information of the energy storage batteries connected to the same inverter is the same. Then, the battery operating parameters of the energy storage batteries with the same marking information are divided into the same battery parameter group. Since the energy storage batteries connected to the same inverter are connected in series with each other, that is, the battery operating parameters in the same battery parameter group can be considered as the battery operating parameters of each energy storage battery on the same series branch. Through the preset fault parameter threshold and all the battery operating parameters in each battery parameter group, an abnormal parameter group is determined. Among them, the abnormal data group indicates that at least one of the multiple energy storage batteries corresponding to the abnormal parameter group has a fault. If one energy storage battery on the branch has a fault, it will cause the branch to have a fault. Therefore, after the abnormal parameter group is determined, the target inverter can be determined according to the marking information of the energy storage battery corresponding to the abnormal parameter group. The target inverter is the inverter connected to the faulty energy storage battery. Then, the operating state of the target inverter is controlled according to each battery operating parameter in the abnormal parameter group. Compared with the related technology, if the battery energy storage system fails and adopts the direct shutdown method, the present invention first determines the abnormal parameter group by judging the battery operating parameters in each battery parameter group, and then controls the operating state of the target inverter corresponding to the abnormal parameter group to realize the separate control of the faulty branch. Since the control module only adjusts the operating state of the target inverter and the operating states of the other inverters remain unchanged, that is, the outputs of the other inverters do not change, the influence of the abnormal energy storage battery on the power supply of the energy storage system is effectively reduced.

[0068] Specifically, the energy storage module includes 10 energy storage batteries, the first inverter and the second inverter. The first inverter is connected in series with the first to fifth energy storage batteries, and the second inverter is connected in series with the sixth to tenth energy storage batteries. Since the first inverter is connected in series with the first to fifth energy storage batteries and the second inverter is connected in series with the sixth to tenth energy storage batteries, the marking information of the first to fifth energy storage batteries is the same, and the marking information of the sixth to tenth energy storage batteries is the same. The control module can divide the battery operating parameters of the first to fifth energy storage batteries into the first battery parameter group, and divide the battery operating parameters of the sixth to tenth energy storage batteries into the second battery parameter group. If the first battery parameter group is an abnormal parameter group, the control module can determine the first inverter as the target inverter through the marking information of the energy storage battery corresponding to the first battery parameter group. Then, the control module adjusts the operating state of the first inverter.

[0069] It should be noted that compared with the solution in which a plurality of inverters are included in the energy storage system and each inverter is connected with a control module, the present invention can accurately locate the faulty energy storage battery and the corresponding inverter branch while reducing the production cost of the energy storage system.

[0070] Refer to Figure 3 , Figure 3 which is Figure 2 the specific flowchart of step S200 in

[0071] Step S210: Classify the energy storage batteries corresponding to the same type of marking information into the same battery cluster, so as to divide all energy storage batteries into multiple battery clusters;

[0072] Step S220: Merge the battery operating parameters corresponding to the same battery cluster to obtain the battery parameter groups of each battery cluster.

[0073] It can be understood that there are multiple types of marking information, and the number of types of marking information is equal to the number of inverters, that is, one type of marking information corresponds to one inverter. Different types of marking information indicate different inverters to which the energy storage batteries are connected. The energy storage batteries with the same type of information are connected in series with each other. When multiple energy storage batteries are connected in series, the output ports of the energy storage batteries in the same series branch are the same. Therefore, the energy storage batteries corresponding to the same type of marking information can be classified into the same battery cluster, and then the battery operating parameters corresponding to the same battery cluster are integrated to obtain the battery parameter groups of each battery cluster. The energy storage batteries within each battery cluster are connected in series with each other. If an abnormality occurs in the battery operating parameters within the battery parameter group, it indicates that a fault has occurred in the battery cluster corresponding to the battery parameter group, and the operating state of the inverter connected to the battery cluster can be adjusted.

[0074] Specifically, the first to fifth energy storage batteries are connected to the first inverter, and the sixth to tenth energy storage batteries are connected to the second inverter. Therefore, the first to fifth energy storage batteries can have the same type of marking information, and the sixth to tenth energy storage batteries can have the same type of marking information, that is, the first to fifth energy storage batteries are the same battery cluster, and the sixth to tenth energy storage batteries are the same battery cluster.

[0075] Refer to Figure 4 , Figure 4 which is Figure 2 the specific flowchart of step S300 in

[0076] Step S310: For each battery parameter group, determine the maximum value of all battery operating parameters in the current battery parameter group as the first detection parameter;

[0077] Step S320: Determine the abnormal parameter groups according to the preset fault parameter threshold and the first detection parameter corresponding to each battery parameter group.

[0078] It can be understood that during the operation of the energy storage battery, due to the different production processes and usage times of each energy storage battery, the battery operating parameters of the energy storage batteries corresponding to the same battery parameter group are also different. Since the energy storage batteries corresponding to the same battery parameter group are connected in series, if any energy storage battery in the same series branch fails, it may cause problems in that series branch. When the battery operating parameter is greater than the fault parameter threshold, it indicates that the energy storage battery corresponding to the battery operating parameter has a fault. Therefore, the maximum value of all the battery operating parameters in the battery parameter group can be determined as the first detection parameter, and then the preset fault parameter threshold is compared with the first detection parameter corresponding to each battery parameter group. The battery parameter group with the first detection parameter greater than the fault parameter threshold is determined as the abnormal parameter group. By determining the maximum value of all the battery operating parameters in the battery parameter group as the first detection parameter for comparison, the battery cluster with faulty energy storage batteries can be determined in a timely manner. In addition, in the technical solution of the present invention, by making a judgment on the entire group of battery operating parameters in the battery parameter group, determining the abnormal parameter group, and then directly controlling the inverter corresponding to the abnormal parameter group, it is not necessary to judge each individual energy storage battery, so the efficiency of fault detection can be effectively improved.

[0079] It should be noted that the battery operating parameters include battery temperature, battery current, and battery voltage, and the fault parameter threshold includes a temperature threshold, a current threshold, and a voltage threshold. Therefore, the first detection parameter includes a temperature detection parameter, a current detection parameter, and a voltage detection parameter. Among them, the temperature detection parameter is the maximum value of all the battery temperatures in the current battery parameter group, the current detection parameter is the maximum value of all the battery currents in the current battery parameter group, and the voltage detection parameter is the maximum value of all the battery voltages in the current battery parameter group. During the process of judging the abnormal parameter group, if any one of the temperature detection parameter, the current detection parameter, and the voltage detection parameter is greater than the fault parameter threshold, it can be considered that the battery parameter group is an abnormal parameter group.

[0080] It should be noted that when the first detection parameter is greater than the fault parameter threshold, the larger the difference between the first detection parameter and the fault parameter threshold, the more serious the fault of the energy storage battery. Therefore, the fault level can be determined according to the difference between the first detection parameter and the fault parameter threshold; then, according to different fault levels, the working state of the target inverter can be controlled. For example, when the difference between the first detection parameter and the fault parameter threshold is greater than or equal to the first level threshold, the fault level can be determined as the first fault level. When the difference between the first detection parameter and the fault parameter threshold is greater than or equal to the second level threshold, the fault level can be determined as the second fault level. Then, according to different fault levels, the working state of the target inverter is controlled. The fault degree of the second fault level is greater than that of the first fault level. Among them, the first level threshold, the second level threshold, and the fault parameter threshold can be adjusted according to the actual application situation, and the present invention does not make any restrictions.

[0081] Specifically, the voltage threshold is 3.55 volts, the first level threshold is 0, and the second level threshold is 0.2. When the voltage detection parameter is 3.60, the difference between the voltage detection parameter and the fault parameter threshold is greater than the first level threshold but less than the second level threshold. The fault level can be determined as the first fault level. At this time, it can be considered that there is a voltage fault in the energy storage battery but the fault is controllable. The control module can control the output power of the target inverter to be halved. When the voltage detection parameter is 3.70, the difference between the voltage detection parameter and the fault parameter threshold is greater than the second level threshold. The fault level can be determined as the second fault level. At this time, it can be considered that the voltage of the energy storage battery is out of control. The control module can control the target inverter to stop, avoiding the faulty energy storage battery from continuing to work. In addition, when the fault level is the second fault level, the isolator switch corresponding to the target inverter can also be turned off, thereby cutting off the DC side circuit of the target inverter.

[0082] It should be noted that the control module judges the battery working parameters in the battery parameter group in real time. For example, when the fault level is the first fault level, after the control module controls the output power of the target inverter to be halved, the first detection parameter in the battery parameter group corresponding to the target inverter is less than the fault parameter threshold, indicating that the energy storage battery corresponding to the target inverter has returned to normal. At this time, the abnormal parameter group can be changed to a normal battery parameter group, and the fault level is cleared.

[0083] Therefore, when the fault level reaches the second fault level, the duration of the second fault level can also be recorded. When the duration is greater than the preset time threshold, the isolator switch corresponding to the target inverter is turned off, thereby cutting off the DC side circuit of the target inverter.

[0084] It should be noted that after determining the fault level, different alarm messages can also be sent according to different fault levels. Among them, sending an alarm message can be to send a fault message to the user's mobile device according to the pre-set contact information of the user's mobile device. In addition, the alarm message can also include the fault level and specific fault content. The fault message includes but is not limited to text message reminders, phone voice reminders, etc.; sending a fault message can also be to directly send a sound warning signal or an optical prompt signal.

[0085] Refer to Figure 5 , Figure 5 is Figure 2 the specific flowchart of step S500 in

[0086] Step S510: Compare all battery operating parameters of the abnormal parameter group with the fault parameter threshold value to determine the fault level.

[0087] Step S520: Control the operating state of the target inverter according to the fault level.

[0088] It can be understood that there must be battery operating parameters in the abnormal parameter group that are greater than the fault parameter threshold value. Therefore, all battery operating parameters of the abnormal parameter group can be compared with the fault parameter threshold value in terms of numerical magnitude to determine the fault level, and then the operating state of the target inverter can be controlled according to different fault levels. Among them, after comparing all battery operating parameters of the abnormal parameter group with the fault parameter threshold value in terms of numerical magnitude, the battery operating parameters in the abnormal parameter group that are greater than the fault parameter threshold value can be determined as abnormal operating parameters. The more the number of abnormal operating parameters, the more serious the fault of the energy storage battery corresponding to the abnormal parameter group. Therefore, the fault level can be determined according to the number of abnormal operating parameters, and the more the number of abnormal operating parameters, the higher the fault level. For example, when the number of abnormal operating parameters is less than the preset number threshold, the fault level is determined as the first fault level. When the number of abnormal operating parameters is greater than the preset number threshold, the fault level is determined as the second fault level. Among them, the preset number threshold can be adjusted according to the actual application situation, and the present invention does not make specific limitations.

[0089] It should be noted that the greater the difference between the battery operating parameter and the fault parameter threshold value when the battery operating parameter is greater than the fault parameter threshold value, the more serious the fault of the energy storage battery. Therefore, during the process of comparing all battery operating parameters of the abnormal parameter group with the fault parameter threshold value in terms of numerical magnitude, the difference between the battery operating parameter greater than the fault parameter threshold value and the fault parameter threshold value can also be calculated, and then the maximum value among multiple differences is taken to determine the fault level.

[0090] It should be noted that different control methods can be adopted for different fault levels. For example, when the voltage threshold is 3.55 volts and the maximum difference is less than 0.2, the fault level can be determined as the first fault level. At this time, it can be considered that there is a voltage fault in the energy storage battery but the fault is controllable, and the control module can control the output power of the target inverter to be halved. When the maximum difference is greater than 0.2, the fault level can be determined as the second fault level. At this time, it can be considered that the voltage of the energy storage battery is out of control, and the control module can control the target inverter to stop operating to prevent the faulty energy storage battery from continuing to work. In addition, when the fault level is the second fault level, the isolator switch corresponding to the target inverter can also be turned off to cut off the DC side circuit of the target inverter and prevent the faulty energy storage battery from continuing to output voltage.

[0091] Specifically, when the fault level is at the first fault level, the output power of the target inverter can also be adjusted according to the abnormal operating parameters. For example, calculate the difference between the abnormal operating parameters and the fault parameter threshold, and then gradually reduce the output power of the target inverter as the difference increases until the difference reaches 0.2, at which time the fault level is upgraded to the second fault level and the target inverter is controlled to stop operating.

[0092] Refer to Figure 6 , Figure 6 which is a flowchart of the fault control method for the energy storage system provided by another embodiment of the present invention, including but not limited to the following steps:

[0093] Step S600, when any battery temperature in the abnormal parameter group is greater than or equal to the temperature threshold, control the working power of the battery cooling device to increase;

[0094] Step S700, when the duration of the battery cooling device operating at the increased working power reaches the first preset duration, re-obtain the battery temperature of the energy storage battery corresponding to the abnormal parameter group;

[0095] Step S800, control the working state of the target inverter according to the re-obtained battery temperature and the temperature threshold.

[0096] It can be understood that during the long-term operation of the energy storage battery, due to the heat accumulation effect, the heat of the energy storage battery will continuously accumulate, resulting in an increase in the battery temperature. Therefore, when the temperature of any battery in the abnormal parameter group is greater than or equal to the temperature threshold, the working power of the battery cooling device can be increased to control, thereby improving the refrigeration effect of the battery cooling device, accelerating the heat exchange efficiency of the refrigerant in the heat exchange pipeline with the energy storage battery, and thus reducing the battery temperature of the energy storage battery. When the operation duration of the battery cooling device at the increased working power reaches the first preset duration, the battery temperature of the energy storage battery corresponding to the abnormal parameter group is re-acquired. That is, after the operation duration of the battery cooling device at the increased working power reaches the first preset duration, the battery working parameters of the energy storage battery corresponding to the abnormal parameter group are re-acquired, and then the re-acquired battery temperature is compared with the temperature threshold. According to the comparison result, the working state of the target inverter is adjusted. For example, if the re-acquired battery temperature is less than the temperature threshold and the remaining battery working parameters in the abnormal parameter group are all less than the fault parameter threshold, it indicates that the increase in the battery temperature of the energy storage battery is due to long-term operation rather than a fault of the energy storage battery, and the current working state of the target inverter can be maintained. If the re-acquired battery temperature is greater than the temperature threshold, it indicates that the battery cooling system cannot effectively reduce the battery temperature of the energy storage battery. At this time, it can be considered that the battery temperature of the energy storage battery continues to rise due to an internal fault. That is, the fault level can be determined according to the difference between the battery temperature and the fault parameter threshold, and then the working state of the target inverter can be controlled according to different fault levels.

[0097] In a second aspect, referring to Figure 7 , an embodiment of the present invention provides an operation control device 700, including a memory 710, a processor 720, and a computer program stored on the memory 710 and executable on the processor 720. The processor 720 executes the program to implement the fault control method of the energy storage system in the first aspect embodiment above. For example, execute Figure 2 the method steps S100 to S500 in Figure 3 the method steps S210 to S220 in Figure 4 the method steps S310 to S320 in Figure 5 the method steps S510 to S520 in Figure 6 and the method steps S600 to S800 in

[0098] The memory 710, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs, such as the fault control method of the energy storage system in the above embodiments of the present invention. The processor 720 realizes the fault control method of the energy storage system in the above embodiments of the present invention by running the non-transitory software programs and instructions stored in the memory 710.

[0099] The memory 710 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data required for executing the fault control method of the energy storage system in the above embodiments, etc. In addition, the memory 710 may include a high-speed random access memory 710, and may also include a non-transitory memory 710, such as at least one magnetic disk storage device, a flash memory device, or other non-transitory solid-state storage devices. It should be noted that the memory 710 may optionally include a memory 710 remotely provided with respect to the processor 720, and these remote memories 710 may be connected to the terminal through a network. Examples of the above network include but are not limited to the Internet, an enterprise intranet, a local area network, a mobile communication network, and combinations thereof.

[0100] In a third aspect, an embodiment of the present invention provides an energy storage system. The energy storage system includes an operation control device 700 as in the embodiment of the second aspect. Since the marker information of the energy storage batteries connected to the same inverter is the same, all battery operating parameters can be grouped according to the marker information, and the battery operating parameters with the same marker information can be divided into the same battery parameter group, that is, the inverters connected to the energy storage batteries corresponding to the same battery parameter group are the same. After determining the abnormal parameter group according to the preset fault parameter threshold and all battery operating parameters in each battery parameter group, since each battery parameter group corresponds to an inverter, therefore, the target inverter can be determined according to the marker information of the energy storage battery corresponding to the abnormal parameter group, where the target inverter indicates that there is an abnormality in the energy storage battery connected to the inverter. Finally, the operating state of the target inverter is controlled according to each battery operating parameter in the abnormal parameter group. The technical solution of the present invention only adjusts the inverter corresponding to the abnormal energy storage battery and will not affect the operating states of other inverters. Therefore, compared with the related art, in which the direct shutdown method is used for processing, the present application can effectively reduce the impact of the abnormal energy storage battery on the power supply of the energy storage system.

[0101] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium. The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause a computer to execute the fault control method of the energy storage system in the first aspect embodiment above, such as executing Figure 2 method steps S100 to S500 in Figure 3 method steps S210 to step S220 in Figure 4 method steps S310 to step S320 in Figure 5 method steps S510 to step S520 in Figure 6 and method steps S600 to S800 in

[0102] Those of ordinary skill in the art will understand that all or some of the steps and systems disclosed in the above methods can be implemented as software, firmware, hardware, and their appropriate combinations. 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 can be implemented as hardware, or can be implemented as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include a computer storage medium or a non-transitory medium and a communication medium or a transitory medium. As is well known to those of ordinary skill in the art, a computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. A computer storage medium includes, but is not limited to, RAM, ROM, EEPROM, flash memory, or other memory technologies, CD-ROM, digital versatile disk (DVD), or other optical disk storage, magnetic cassettes, tapes, magnetic disk storage, or other magnetic storage devices, or any other medium that can be used to store the desired information and can be accessed by a computer. In addition, as is well known to those of ordinary skill in the art, a communication medium typically contains computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transmission mechanism, and can include any information delivery medium.

[0103] In the description of this specification, the descriptions referring to the terms "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0104] The above has specifically described the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Those skilled in the art can also make various equivalent deformations or substitutions without departing from the spirit of the present invention, and these equivalent deformations or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A fault control method for an energy storage system, characterized in that: The energy storage system includes a control module, a plurality of energy storage batteries and a plurality of inverters, wherein the inverter is connected to at least one of the energy storage batteries, the control module is respectively connected to all of the energy storage batteries and all of the inverters, and the fault control method is applied to the control module, and the fault control method includes: Obtaining marking information and battery operating parameters of all the energy storage batteries; Grouping all the battery operating parameters according to the marking information to obtain multiple battery parameter groups; Determine an abnormal parameter group according to a preset fault parameter threshold and all the battery operating parameters in each of the battery parameter groups; Determining a target inverter according to the marking information of the energy storage battery corresponding to the abnormal parameter group; The operating state of the target inverter is controlled according to each of the battery operating parameters in the abnormal parameter group.

2. The fault control method according to claim 1, characterized in that: There are multiple types of the tag information, and the number of types of the tag information is equal to the number of the inverters. Different types of the tag information indicate that the energy storage batteries are connected to different inverters. All the battery operating parameters are grouped according to the tag information to obtain multiple battery parameter groups, including: Classifying the energy storage batteries corresponding to the marking information of the same type into the same battery cluster, so as to divide all the energy storage batteries into a plurality of battery clusters; The battery operating parameters corresponding to the same battery cluster are combined to obtain battery parameter groups of each battery cluster.

3. The fault control method according to claim 1, characterized in that: The determining of the abnormal parameter group according to the preset fault parameter threshold and all the battery operating parameters in each of the battery parameter groups includes: For each of the battery parameter groups, determining the maximum value of all the battery operating parameters in the current battery parameter group as the first detection parameter; An abnormal parameter group is determined according to a preset fault parameter threshold and the first detection parameter corresponding to each of the battery parameter groups.

4. The fault control method according to claim 3, characterized in that: The controlling the working state of the target inverter according to each of the battery working parameters in the abnormal parameter group includes: Determining a fault level according to a difference between the first detection parameter and the fault parameter threshold; According to the fault level, the working state of the target inverter is controlled.

5. The fault control method according to claim 1, characterized in that: The controlling the working state of the target inverter according to each of the battery working parameters in the abnormal parameter group includes: Compare the numerical values ​​of all the battery operating parameters of the abnormal parameter group with the fault parameter threshold to determine the fault level; According to the fault level, the working state of the target inverter is controlled.

6. The fault control method according to claim 5, characterized in that: The comparing the numerical values ​​of all the battery operating parameters of the abnormal parameter group with the fault parameter threshold to determine the fault level includes: Determine the battery operating parameter in the abnormal parameter group that is greater than the fault parameter threshold as an abnormal operating parameter; A fault level is determined according to the number of the abnormal operating parameters.

7. The fault control method according to claim 6, characterized in that: The step of controlling the working state of the target inverter according to the fault level includes: When the fault level is at a first fault level, adjusting the output power of the target inverter according to the abnormal operating parameter; When the fault level is at the second fault level, the target inverter is controlled to shut down.

8. The fault control method according to claim 7, characterized in that: An isolating switch is also connected between the inverter and the energy storage battery, and the fault control method further includes: When the fault level reaches the second fault level, the target inverter is controlled to shut down and the isolation switch is turned off.

9. The fault control method according to claim 1, characterized in that: The battery operating parameter includes a battery temperature, the fault parameter threshold includes a temperature threshold, the energy storage system further includes a battery cooling device, the battery cooling device includes a heat exchange pipe for cooling the energy storage battery, and the fault control method further includes: When any battery temperature in the abnormal parameter group is greater than or equal to the temperature threshold, the working power of the battery cooling device is increased and controlled; When the duration for which the battery cooling device operates at the increased working power reaches a first preset duration, reacquiring the battery temperature of the energy storage battery corresponding to the abnormal parameter group; The operating state of the target inverter is controlled according to the reacquired battery temperature and the temperature threshold.

10. An operation control device, characterized in that: The invention comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the fault control method according to any one of claims 1 to 9.

11. An energy storage system, characterized in that: It comprises the operation control device as claimed in claim 10.

12. A computer storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to enable a computer to execute the fault control method according to any one of claims 1 to 9.

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