Battery cluster power-on / power-off control method, apparatus, and related device

Abstract

To solve a problem of manual maintenance being required for fault handling after a battery cluster is separated from a system due to a fault, and to improve the automatic management capability of the system.SOLUTION: The invention provides a battery cluster power-on / off control method, an apparatus, and a related device. The method includes the steps of: determining whether or not a fault-free unconnected RACK of an energy storage system satisfies a charging condition; determining whether a bus voltage of the energy storage system is equal to or higher than a voltage of the fault-free unconnected RACK when the fault-free unconnected RACK satisfies the charging condition; determining whether or not the fault-free unconnected RACK satisfies a cluster inputting condition when the bus voltage of the energy storage system is equal to or higher than the voltage of the fault-free unconnected RACK; and inputting the fault-free unconnected RACK into the energy storage system when the fault-free unconnected RACK satisfies the cluster inputting condition.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of energy storage system battery clusters, and in particular to a battery cluster input / output control method, apparatus, and related devices. [Background technology]

[0002] In a large-scale energy storage system, a battery cluster (Battery Cluster / Battery Rack) is controlled to be turned on and off by a DC contactor in a high-voltage switch box. During system operation, if a battery cluster fails and is disconnected from the system, the energy storage system is still in use. Due to the dynamic change of the differential pressure, the failed cluster has few opportunities to satisfy a small load and the differential pressure to be turned on. After the battery cluster is disconnected from the system due to a failure, it is difficult to reconnect it to the system after the failure is resolved. This ultimately reduces the charging and discharging capacity of the system, affecting the usage and revenue of customers.

[0003] In related technology, battery clusters are controlled to be connected to or disconnected from the system by DC contactors in a high-voltage switch box. However, DC contactors are mechanical contacts, and connecting or disconnecting them under load directly affects the contactor's lifespan. Furthermore, DC contactor specifications provide service lifespans for different load currents. To ensure the service life of the DC contactors, certain requirements are placed on the voltage at which the battery cluster is connected and the voltage of the batteries being connected when the battery cluster is connected or disconnected. Because the differential pressure between the two is large, a large reflux current occurs between the battery clusters at the moment of connection, shortening the lifespan of the DC contactors. Therefore, the differential pressure between the two cannot be large, and software can be used to configure the differential pressure. If the differential pressure is greater than the software-defined threshold, the battery cluster cannot be connected to the system. During system operation, if a fault occurs in one of the battery clusters, it will be disconnected from the system, and the system will charge and discharge normally. However, after the battery cluster fault is resolved, it will not be able to be connected to the system due to the differential pressure.

[0004] Therefore, how to control the on-off and on-off of battery clusters so as to solve the problem of requiring manual maintenance to handle the failure after the battery cluster is disconnected from the system due to a failure and to improve the automatic management capability of the system is a problem that needs to be solved urgently by those skilled in the art. Summary of the Invention [Problem to be solved by the invention]

[0005] In view of this, embodiments of the present invention provide a battery cluster on-board / off-board control method, apparatus, and related devices, which solve the problem of requiring manual maintenance for fault handling after a battery cluster is disconnected from the system due to a fault, and improve the system's automatic management capabilities. [Means for solving the problem]

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions. A first aspect of an embodiment of the present invention discloses a battery cluster power-on / power-off control method applied to an energy storage system, Determining whether a fault-free unconnected RACK of the energy storage system meets a charging condition; When the fault-free unconnected RACK satisfies the charging condition, determining whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK; When the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, determining whether the fault-free unconnected RACK satisfies a cluster entry condition; If the fault-free unconnected RACK satisfies a cluster entry condition, the fault-free unconnected RACK is entered into the energy storage system.

[0007] Optionally, before determining whether a fault-free unconnected RACK of the energy storage system satisfies a charging condition, Determining whether there is a fault-free unconnected RACK in the energy storage system; If there is a fault-free unconnected RACK in the energy storage system, the method further includes: performing a step of determining whether the fault-free unconnected RACK in the energy storage system satisfies a charging condition.

[0008] Optionally, When the fault-free unconnected RACK does not meet the charging condition, determining whether the bus voltage of the energy storage system is lower than or equal to the voltage of the fault-free unconnected RACK; When the bus voltage of the energy storage system is equal to or lower than the voltage of the fault-free unconnected RACK, determining whether the fault-free unconnected RACK satisfies a cluster entry condition; If the fault-free unconnected RACK satisfies a cluster entry condition, the fault-free unconnected RACK is entered into the energy storage system.

[0009] Optionally, the charging condition includes that a charging current of the non-fault unconnected RACK is equal to or greater than a preset current threshold.

[0010] Optionally, in the step of determining whether the bus voltage of the energy storage system is equal to or greater than the fault-free unconnected RACK, The method further includes clearing the power drop count of the energy storage system when the bus voltage of the energy storage system is lower than the voltage of the fault-free unconnected RACK.

[0011] Optionally, the cluster entry condition includes a current operating current of the energy storage system being less than or equal to a preset current.

[0012] Optionally, the cluster entry condition further comprises: a number of energy storage system power drops is greater than a preset number.

[0013] Optionally, in the step of determining whether the fault-free unconnected RACK satisfies a cluster entry condition, If the fault-free unconnected RACK does not satisfy the cluster entry condition, the method further includes reducing the power of the energy storage system and determining again whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK.

[0014] Optionally, the step of injecting the fault-free unconnected RACK into the energy storage system includes: Reading operation information of the fault-free unconnected RACK; and injecting the fault-free unconnected RACK into the energy storage system based on the operation information.

[0015] A second aspect of the present invention discloses a battery cluster input / output control device applied to an energy storage system, the device comprising: a charging determination module for determining whether the fault-free unconnected RACK of the energy storage system meets a charging condition; a first voltage determination module for determining whether a bus voltage of the energy storage system is equal to or greater than a voltage of the non-fault unconnected RACK when the non-fault unconnected RACK satisfies a charging condition; a first cluster entry determination module for determining whether the non-fault non-connected RACK satisfies a cluster entry condition when the bus voltage of the energy storage system is equal to or greater than the voltage of the non-fault non-connected RACK; a first injection module for injecting the fault-free unconnected RACK into the energy storage system when the fault-free unconnected RACK satisfies a cluster injection condition.

[0016] A third aspect of an embodiment of the present invention discloses an electronic device for executing a program, which, when executed, executes a battery cluster power-on / power-off control method described in any one of the first aspect of an embodiment of the present invention.

[0017] A fourth aspect of an embodiment of the present invention discloses a computer storage medium, the storage medium including a storage program, which, when executed, controls a device in which the storage medium is disposed to perform a battery cluster power-on / power-off control method described in any one of the first aspects of an embodiment of the present invention.

[0018] According to the battery cluster input / output control method, apparatus, and related device provided by the above-mentioned embodiment of the present invention, the method includes the steps of: determining whether a fault-free unconnected RACK of the energy storage system satisfies a charging condition; if the fault-free unconnected RACK satisfies the charging condition, determining whether a bus voltage of the energy storage system is equal to or higher than a voltage of the fault-free unconnected RACK; if the bus voltage of the energy storage system is equal to or higher than a voltage of the fault-free unconnected RACK, determining whether the fault-free unconnected RACK satisfies a cluster input condition; and if the fault-free unconnected RACK satisfies the cluster input condition, inputting the fault-free unconnected RACK into the energy storage system. In this method, it is sequentially determined whether the fault-free unconnected RACK in the energy storage system meets the charging conditions, whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK meets the cluster entry conditions. After that, the fault-free unconnected RACK that meets the cluster entry conditions is entered into the energy storage system, thereby solving the problem of requiring manual maintenance to handle the fault after the battery cluster is separated from the system due to a fault and improving the automatic management capability of the system.

[0019] In order to more clearly explain the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Obviously, the drawings in the following description are only the embodiments of the present invention. Those skilled in the art can derive other drawings from these drawings without creative efforts. [Brief explanation of the drawings]

[0020] [Figure 1] 3 is a flowchart of a battery cluster power-on / off control method according to an embodiment of the present invention. [Figure 2] 1 is a flowchart of injecting a fault-free unconnected RACK according to an embodiment of the present invention; [Figure 3] 10 is a flowchart illustrating extraction of a faulty RACK according to an embodiment of the present invention. [Figure 4] FIG. 1 is a diagram illustrating the principle of a control policy for extracting a failure cluster from a system according to an embodiment of the present invention. [Figure 5] FIG. 10 is a principle diagram of a control policy for introducing a failed battery cluster into the system after recovery from the failure according to an embodiment of the present invention; [Figure 6] 1 is a schematic configuration diagram of a battery cluster on / off control device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE INVENTION

[0021] The following clearly and completely describes the technical solutions in the embodiments of the present invention, in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of protection of the present invention.

[0022] As used herein, the terms "comprise," "include," or any other variation thereof, are intended to cover a non-exclusive inclusion, whereby a process, method, article, or device that includes a set of elements includes not only those elements but also other elements not expressly listed or inherent in such process, method, article, or device. Absent further limitations, an element defined by the phrase "comprises one of" does not exclude the presence of other identical elements in a process, method, article, or device that includes that element.

[0023] As can be seen from the background art, in the conventional battery cluster on / off control method, after a battery cluster is disconnected from the system due to a fault, manual maintenance is required to handle the fault, and the system's automatic management ability is poor.

[0024] Therefore, an embodiment of the present invention provides a method, apparatus, and related devices for controlling the input and output of a battery cluster. In this method, it is sequentially determined whether the fault-free unconnected RACK in the energy storage system satisfies the charging conditions, whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK satisfies the cluster input conditions. Then, the fault-free unconnected RACK that satisfies the cluster input conditions is input into the energy storage system, thereby solving the problem of requiring manual maintenance for fault handling after a battery cluster is output from the system due to a fault, and improving the automatic management capability of the system.

[0025] As shown in FIG. 1, it is a flowchart of a battery cluster power-on / power-off control method provided by an embodiment of the present invention.

[0026] The battery cluster power-on / power-off control method is applied to an energy storage system.

[0027] The battery cluster power-on / off control method mainly includes the following steps: Step S101: Determine whether the fault-free unconnected RACK in the energy storage system meets the charging condition; if yes, execute step S102; if not, execute step S107. In step S101, no fault means that in the RACK automatic insertion and extraction process, after the RACK is extracted from the energy storage system due to a fault, the fault of the failed RACK is recovered. Disconnected means that the RACK contactors are not closed and the RACK is not connected in parallel to the DC bus of the energy storage system.

[0028] In actual applications, due to the characteristics of lithium batteries, the battery voltage rises when charging and drops when discharging. When determining charging, a RACK whose closing voltage is greater than the bus voltage is required; otherwise, a RACK whose closing voltage is less than the bus voltage is required.

[0029] The charging condition is that the charging current of the RACK is equal to or greater than a preset current threshold.

[0030] The specific value of the preset current threshold can be determined according to the actual situation of the battery cluster power-on / power-off, and is not limited by the present application, and is within the scope of protection of the present application.

[0031] In some embodiments, the charging current is 2A or greater.

[0032] Specifically, in the process of implementing step S101, the charging current of the fault-free unconnected RACK is compared with a preset current threshold. If the charging current of the fault-free unconnected RACK of the energy storage system is greater than or equal to the preset current threshold, it is determined that the fault-free unconnected RACK of the energy storage system meets the charging conditions, and step S102 is implemented. If the charging current of the fault-free unconnected RACK of the energy storage system is less than the preset current threshold, it is determined that the fault-free unconnected RACK of the energy storage system does not meet the charging condition, and executes step S107.

[0033] Preferably, before performing step S101 to determine whether the fault-free unconnected RACK of the energy storage system satisfies the charging condition, The method further includes the step of determining whether there is a fault-free unconnected RACK in the energy storage system, and if there is a fault-free unconnected RACK in the energy storage system, executing step S101; if there is no fault-free unconnected RACK in the energy storage system, directly terminating the operation.

[0034] In practical application, in the RACK automatic insertion and removal process, after a RACK is removed from the energy storage system due to a fault, if the fault of the failed RACK is recovered, it is considered that the RACK is not faulty.

[0035] When the RACK contactor is closed and the RACK is connected in parallel to the DC bus of the access energy storage system, the RACK is considered to be connected; conversely, the RACK is considered to be disconnected.

[0036] Furthermore, it is determined whether there is a fault-free, unconnected RACK in the energy storage system, that is, whether there is a RACK that has been disconnected from the energy storage system due to a fault and then recovered from the fault, and whose RACK contactor is not closed and is not connected in parallel to the DC bus of the access energy storage system. If there is, execute step S101; if there is not, directly terminate the operation.

[0037] Step S102: Determine whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK; if so, execute step S103; if not, execute step S106.

[0038] Specifically, in the process of implementing step S102, if it is determined that the fault-free unconnected RACK of the energy storage system meets the charging condition, the bus voltage of the energy storage system and the voltage of the fault-free unconnected RACK are detected, and the bus voltage of the energy storage system is compared with the voltage of the fault-free unconnected RACK. If the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, step S103 is executed; if the bus voltage of the energy storage system is lower than the voltage of the fault-free unconnected RACK, step S106 is executed.

[0039] Step S103: Determine whether the fault-free unconnected RACK satisfies the cluster entry condition, and if so, execute step S104; if not, execute step S105.

[0040] In step S103, the cluster input condition includes that the current operating current of the energy storage system is equal to or less than a preset current.

[0041] The specific value of the preset current can be determined according to the actual situation of the battery cluster power-on / power-off, and is not limited in the present application, and is within the scope of protection of the present application.

[0042] In some embodiments, the preset current is 10A.

[0043] The cluster entry condition further includes the number of power drops in the energy storage system being greater than a preset number.

[0044] The specific value of the preset number of times can be determined according to the actual situation of the battery cluster power-on / power-off, and is not limited in the present application, and all are within the scope of protection of the present application.

[0045] In some embodiments, the preset number is three.

[0046] Specifically, in the process of implementing step S103, if it is determined that the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, it detects the current operating current of the energy storage system and compares the current operating current of the energy storage system with a preset current. If the current operating current of the energy storage system is equal to or less than the preset current, it is determined that the fault-free unconnected RACK meets the cluster entry conditions, and executes step S104; if the current operating current of the energy storage system is greater than the preset current, it is determined that the fault-free unconnected RACK does not meet the cluster entry conditions, and executes step S105.

[0047] Alternatively, if it is determined that the bus voltage of the energy storage system is greater than or equal to the voltage of the fault-free unconnected RACK, the number of power drops of the energy storage system is detected, and the number of power drops of the energy storage system is compared with a preset number. If the number of power drops of the energy storage system is greater than the preset number, it is determined that the fault-free unconnected RACK meets the cluster entry condition, and step S104 is executed; if the number of power drops of the energy storage system is less than or equal to the preset number, it is determined that the fault-free unconnected RACK does not meet the cluster entry condition, and step S105 is executed.

[0048] Step S104: The fault-free unconnected RACK is input into the energy storage system.

[0049] Specifically, in the process of implementing step S104, if it is determined that the fault-free unconnected RACK satisfies the cluster entry condition, the fault-free unconnected RACK that satisfies the cluster entry condition is entered into the energy storage system.

[0050] Preferably, in one specific embodiment, the process of performing step S104 to input a fault-free unconnected RACK into the energy storage system includes the following steps, as shown in FIG. Step S201: The operation information of the fault-free unconnected RACK is read. Step S202: Based on the operation information, a fault-free unconnected RACK is injected into the energy storage system.

[0051] In practical applications, the RACK reports its own information in real time, including contactor status, fault status, fault information, current and voltage, etc., and the energy storage system makes logical decisions according to the information reported by the RACK to determine whether to input the RACK into the energy storage system or to extract the RACK from the energy storage system.

[0052] As can be seen from the above description, when the fault-free unconnected RACK meets the cluster entry conditions, the energy storage system reads the operation information of the fault-free unconnected RACK, and confirms that the fault-free unconnected RACK that meets the cluster entry conditions has been entered into the energy storage system based on the current operation information of the energy storage system and information such as current and voltage reported from the fault-free unconnected RACK.

[0053] Step S105: Reduce the energy storage system power.

[0054] Specifically, in the process of implementing step S105, if it is determined that the fault-free unconnected RACK does not meet the cluster entry conditions, the current power of the energy storage system is detected, the energy storage system is controlled to reduce the power to half of the current power, and then it is determined again whether the bus voltage of the energy storage system is equal to or higher than the voltage of the fault-free unconnected RACK, that is, the process returns to step S102.

[0055] Step S106: Clear the power drop count of the energy storage system.

[0056] Specifically, in the process of implementing step S106, if it is determined that the fault-free unconnected RACK of the energy storage system meets the charging condition and the bus voltage of the energy storage system is lower than the voltage of the fault-free unconnected RACK, the power drop count of the energy storage system is cleared.

[0057] Alternatively, if it is determined that the fault-free unconnected RACK of the energy storage system does not meet the charging condition and the bus voltage of the energy storage system is greater than the voltage of the fault-free unconnected RACK, the power drop count of the energy storage system is cleared.

[0058] Step S107: Determine whether the bus voltage of the energy storage system is lower than or equal to the voltage of the fault-free unconnected RACK; if so, execute step S108; if not, execute step S106.

[0059] Specifically, in the process of implementing step S107, if it is determined that the fault-free unconnected RACK of the energy storage system does not meet the charging conditions, the bus voltage of the energy storage system and the voltage of the fault-free unconnected RACK are detected, and the bus voltage of the energy storage system is compared with the voltage of the fault-free unconnected RACK. If the bus voltage of the energy storage system is less than or equal to the voltage of the fault-free unconnected RACK, step S108 is executed; if the bus voltage of the energy storage system is greater than the voltage of the fault-free unconnected RACK, step S106 is executed.

[0060] Step S108: Determine whether the fault-free unconnected RACK satisfies the cluster entry condition, and if so, execute step S109; if not, execute step S110.

[0061] The cluster input conditions in step S108 are the same as those explained in step S103, and can be referred to, so they will not be explained again here.

[0062] Specifically, in the process of implementing step S108, if it is determined that the bus voltage of the energy storage system is lower than or equal to the voltage of the fault-free unconnected RACK, the current operating current of the energy storage system is detected, and the current operating current of the energy storage system is compared with a preset current. If the current operating current of the energy storage system is lower than or equal to the preset current, it is determined that the fault-free unconnected RACK meets the cluster entry condition, and step S109 is executed; if the current operating current of the energy storage system is higher than the preset current, it is determined that the fault-free unconnected RACK does not meet the cluster entry condition, and step S110 is executed.

[0063] Alternatively, the number of power drops of the energy storage system is detected, and the number of power drops of the energy storage system is compared with a preset number. If the number of power drops of the energy storage system is greater than the preset number, it is determined that the fault-free unconnected RACK meets the cluster entry condition, and step S109 is executed; if the number of power drops of the energy storage system is less than the preset number, it is determined that the fault-free unconnected RACK does not meet the cluster entry condition, and step S110 is executed.

[0064] Step S109: The fault-free and unconnected RACK is input into the energy storage system.

[0065] Specifically, in the process of implementing step S109, if it is determined that the fault-free unconnected RACK satisfies the cluster entry condition, the fault-free unconnected RACK that satisfies the cluster entry condition is entered into the energy storage system.

[0066] Step S110: Reduce the energy storage system power.

[0067] Specifically, in the process of implementing step S110, if it is determined that the fault-free unconnected RACK does not meet the cluster entry conditions, the current power of the energy storage system is detected, the energy storage system is controlled to reduce the power to half of the current power, and then it is determined again whether the bus voltage of the energy storage system is lower than or equal to the voltage of the fault-free unconnected RACK, that is, the process returns to step S107.

[0068] Based on the battery cluster input / output separation control method provided by the embodiment of the present invention, it is sequentially determined whether the fault-free unconnected RACK of the energy storage system satisfies the charging conditions, whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK satisfies the cluster input conditions, and then the fault-free unconnected RACK that satisfies the cluster input conditions is input into the energy storage system, thereby solving the problem of requiring manual maintenance for fault handling after a battery cluster is separated from the system due to a fault and improving the automatic management capability of the system.

[0069] Based on the above-mentioned embodiment of injecting a fault-free unconnected RACK into the energy storage system, the embodiment of the present invention further provides an embodiment of correspondingly extracting a faulty RACK from the energy storage system, which includes the following steps, as shown in FIG. Step S301: Determine whether there is a faulty RACK in the energy storage system, and if so, execute step S302; otherwise, directly end the operation.

[0070] As can be seen from the above, the fault means that a fault occurs in the RACK during the RACK automatic insertion and removal process, which affects the operating efficiency of the energy storage system.

[0071] Furthermore, determine whether there is a faulty RACK in the energy storage system, that is, determine whether there is a faulty RACK in the energy storage system, and if there is, execute step S302; if there is not, directly end the operation.

[0072] In actual applications, the CMU (cell monitor unit, battery cluster management unit) detects the operation information of each RACK in the energy storage system and, based on the operation information of each RACK, detects whether the RACK has a fault. If the RACK has a fault, its required power is set to 0; if the RACK has no fault, its required power is obtained according to a preset current limit matrix. The CMU then reports the fault status and required power of each RACK to the battery system management unit. The battery system management unit collects or reads the fault status and required power of each RACK in the energy storage system reported by the CMU in real time and controls the charging and discharging power of the system.

[0073] The operation information of each RACK includes at least the fault status, connection status, and corresponding power requirements of the RACK.

[0074] Step S302: Determine whether the faulty RACK satisfies the cluster cut-out condition. If yes, execute step S303; if not, execute step S306.

[0075] In step S302, the cluster extraction conditions include that the charging and discharging power of the energy storage system is equal to a preset power.

[0076] The specific value of the preset power can be determined according to the actual situation of the battery cluster power supply and power supply, and is not limited by the present application, and is within the scope of protection of the present application.

[0077] Specifically, in the process of implementing step S302, if it is determined that there is a faulty RACK in the energy storage system, detect the charging and discharging power of the energy storage system, compare the charging and discharging power of the energy storage system with a preset power, if the charging and discharging power of the energy storage system is equal to the preset power, it is determined that the faulty RACK meets the cluster cutting condition, and executes step S303; if the charging and discharging power of the energy storage system is not equal to the preset power, it is determined that the faulty RACK does not meet the cluster cutting condition, and executes step S307.

[0078] Step S303: The faulty RACK is extracted from the energy storage system.

[0079] Specifically, in the process of implementing step S303, if it is determined that the faulty RACK satisfies the cluster extraction condition, the faulty RACK that satisfies the cluster extraction condition is extracted from the energy storage system. In practical application, after determining that the faulty RACK satisfies the cluster cutting condition, the charging and discharging power of the energy storage system is first reduced to 0, and then the faulty RACK that satisfies the cluster cutting condition is cut out from the energy storage system.

[0080] Step S304: The number of connected RACKs is determined.

[0081] Specifically, in the process of implementing step S304, after the faulty RACKs are extracted from the energy storage system, there are still fault-free RACKs in the energy storage system, and among the fault-free RACKs, the RACKs in the connected state are determined, that is, the number of connected RACKs among the fault-free RACKs is determined.

[0082] Step S305: If the number of connected RACKs is less than the preset minimum number of RACKs, execute step S306; otherwise, execute step S307.

[0083] In step S305, the minimum number of RACKs is the minimum number of RACKs to satisfy the power usage of the client, and the default is the total number of RACKs.

[0084] In some embodiments, the minimum number of RACKs is one.

[0085] Specifically, in the process of implementing step S305, the number of connected RACKs is compared with the preset minimum number of RACKs. If the number of connected RACKs is less than the preset minimum number of RACKs, it indicates that the number of connected RACKs in the energy storage system cannot meet the client power demand, and step S306 is executed; if the number of connected RACKs is equal to or greater than the preset minimum number of RACKs, it indicates that the number of connected RACKs in the energy storage system can meet the client power demand, and step S307 is executed.

[0086] Step S306: All RACKs are disconnected from the energy storage system, and the energy storage system is controlled to change from the running mode to the failure mode.

[0087] Specifically, in the process of implementing step S306, if it is determined that the number of connected RACKs is less than the preset minimum number of RACKs, all battery clusters are disconnected from the energy storage system, it is determined that the current operating mode of the energy storage system is the running mode, and the energy storage system is controlled to convert from the running mode to the failure mode.

[0088] In other words, if it determines that the number of connected RACKs is less than the preset minimum number of RACKs, the battery system management unit controls all RACKs to power down; specifically, the battery system management unit controls the energy storage system to issue a power-down command to the battery cluster management unit, and the battery cluster management unit receives the power-down command and controls all RACKs to power down based on the power-down command.

[0089] Step S307: The power requirements of the connected RACKs and the total number of all RACKs are determined.

[0090] Specifically, in the process of implementing step S307, if it is determined that the number of connected RACKs is greater than or equal to the preset minimum number of RACKs, the required power of each connected RACK and the total number of all RACKs are obtained based on the operation information of all RACKs.

[0091] Step S308: Calculate the charging and discharging power of the energy storage system based on the required power of the connected RACKs and the total number of all RACKs.

[0092] Specifically, in the process of implementing step S308, the system charge / discharge power is calculated based on the required power of each connected RACK and the total number of all RACKs.

[0093] Step S309: Based on the charging and discharging power of the energy storage system, restore the power of the energy storage system and control the energy storage system to operate normally.

[0094] Specifically, in the process of implementing step S309, the power of the energy storage system is restored based on the calculated charging and discharging power of the energy storage system, and the energy storage system is controlled to operate normally based on the power of the energy storage system.

[0095] Based on the battery cluster input / output cut-out control method provided by the embodiment of the present invention, after determining that the faulty RACK of the energy storage system meets the cluster cut-out condition, the faulty RACK is cut out from the energy storage system, and whether to cut out all RACKs from the energy storage system is determined based on the number of connected RACKs, thereby determining whether the energy storage system is in a fault mode and improving the automatic management ability of the system.

[0096] To better understand the above-mentioned cluster cut-out control policy and cluster introduction control policy, FIG. 4 shows a principle diagram of the control policy for cutting out a faulty cluster from the system provided by the embodiment of the present invention.

[0097] In Figure 4, the battery cluster management unit CMU detects whether any RACK has a fault, and if there is a fault, it detects the chargeable / dischargeable power of the battery cluster and the RACK required power, in this case the RACK required power is 0, and if there is no fault, it obtains the RACK required power based on the preset current limit matrix and uploads the RACK status and power to the battery system management unit.

[0098] The battery system management unit collects the status and power values reported by the CMU in real time and controls the charging and discharging power of the system. If a RACK fails, the battery system management unit controls the charging and discharging power of the system to 0 and controls the failed RACK to be cut out from the system. The battery system management unit determines whether the number of connected RACKs is smaller than a set minimum number of RACKs, and if the number of connected RACKs is equal to or greater than the minimum number of RACKs, calculates the system charging / discharging power according to the currently connected RACKs, restores the system power, and allows the system to operate normally; if the number of connected RACKs is smaller than the set minimum number of RACKs, controls the system to extract all RACKs, controls the system to power down all RACKs, and controls the system to convert from operation mode to failure mode, or issues a command to the battery cluster management unit CMU, and the battery cluster management unit CMU receives the command and controls the system to power down the corresponding RACK according to the command.

[0099] FIG. 5 shows a principle diagram of a control policy for entering a failed RACK into a system after the failed RACK has recovered from its failure, provided by an embodiment of the present invention.

[0100] In FIG. 5, Step 1: If the energy storage system monitors that there is a fault-free unconnected RACK, it executes Step 2. Step 2: If the fault-free unconnected RACK satisfies the charging condition, execute step 3; otherwise, execute step 6. Step 3: Determine whether the bus voltage of the energy storage system is equal to or greater than the RACK voltage to be turned on or off. If it is greater, execute step 4; if not, execute step 5. Step 4: The energy storage system continuously reduces the power, detects the number of times the energy storage system's power has continuously reduced and the current operating current of the energy storage system, and determines whether the number of times the energy storage system's power has continuously reduced is greater than 3 or whether the current operating current is less than or equal to 10A. If the conditions are not met, reduce the power of the energy storage system to half of the current power and return to step 2; if the conditions are met, control the energy storage system to input the RACK that should be input or output, and return to step 1. Step 5: Clear the number of consecutive power drops in the energy storage system and return to step 1. Step 6: Determine whether the bus voltage of the energy storage system is equal to or lower than the RACK voltage to be turned on or off. If so, execute step 7; if not, execute step 8. Step 7: The energy storage system continuously reduces the power, detects the number of times the energy storage system's power continuously reduces and the current operating current of the energy storage system, and determines whether the number of times the energy storage system's power continuously reduces is greater than 3 or whether the current operating current is less than or equal to 10A. If the conditions are not met, reduce the power of the energy storage system to half of the current power and return to step 2; if the conditions are met, control the energy storage system to power on the RACK that should be powered on or off, and return to step 1. Step 8: Clear the number of consecutive power drops in the energy storage system, and then return to step 1.

[0101] The battery cluster power-on / power-off control method described above thoroughly solves the problem of requiring manual intervention to close a battery cluster after it is disconnected from the system due to a fault, thereby reducing system maintenance and operation costs. Furthermore, when powering on / off, the voltage change characteristics of the lithium-iron battery after a power drop are taken into account, and a three-step power drop sequence effectively reduces the power-on / power-off time, maximizing system utilization and ensuring client revenue. Furthermore, the intelligent management capabilities of the system can be improved without increasing hardware costs.

[0102] Based on the battery cluster entry and exit control method provided by the embodiment of the present invention, if a faulty RACK exists in the energy storage system and the faulty RACK satisfies the cluster entry conditions, the faulty RACK is exited from the energy storage system, and it is sequentially determined that a fault-free unconnected RACK exists in the energy storage system and the fault-free unconnected RACK satisfies the charging conditions, the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, and the fault-free unconnected RACK satisfies the cluster entry conditions. Then, the fault-free unconnected RACK that satisfies the cluster entry conditions is entered into the energy storage system, thereby solving the problem of requiring manual maintenance for fault handling after a battery cluster is exited from the system due to a fault and improving the automatic management capability of the system.

[0103] Corresponding to the battery cluster power-on / off control method shown in FIG. 1 of the above embodiment of the present invention, the embodiment of the present invention further provides a battery cluster power-on / off control device, which is applied to an energy storage system. As shown in FIG. 6, the battery cluster power-on / off control device includes: a charging judgment module 601, a first voltage judgment module 602, a first cluster power-on judgment module 603, and a first power-on module 604.

[0104] The charging judgment module 601 judges whether the fault-free unconnected RACK of the energy storage system meets the charging conditions, and if the fault-free unconnected RACK meets the charging conditions, executes the first voltage judgment module 602, and if the fault-free unconnected RACK does not meet the charging conditions, executes the second voltage judgment module. The first voltage judgment module 602 judges whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, and if the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, executes the first cluster input judgment module 603, and if the bus voltage of the energy storage system is lower than the voltage of the fault-free unconnected RACK, executes the clear module. The first cluster entry judgment module 603 judges whether the fault-free unconnected RACK satisfies the cluster entry condition, and if the fault-free unconnected RACK satisfies the cluster entry condition, executes the first entry module; if the fault-free unconnected RACK does not satisfy the cluster entry condition, executes the first power reduction module. A first injection module 604 injects the fault-free unconnected RACK into the energy storage system.

[0105] Optionally, based on the battery cluster power-on / off control device shown in Figure 6 above, before the charging judgment module 601 judges whether the fault-free unconnected RACK of the energy storage system meets the charging conditions, in combination with Figure 6, the battery cluster power-on / off control device further comprises a first judgment module.

[0106] The first determination module determines whether there is a fault-free unconnected RACK in the energy storage system; if there is a fault-free unconnected RACK in the energy storage system, executes the charging determination module 601 .

[0107] Optionally, based on the battery cluster power-on / off control device shown in Figure 6 above, by combining Figure 6, the battery cluster power-on / off control device further includes a second voltage judgment module, a second cluster power-on judgment module, and a second power-on module.

[0108] a second voltage determination module for determining whether a bus voltage of the energy storage system is equal to or lower than a voltage of the non-fault unconnected RACK; if the bus voltage of the energy storage system is equal to or lower than a voltage of the non-fault unconnected RACK, executing a second cluster input determination module; if the bus voltage of the energy storage system is higher than a voltage of the non-fault unconnected RACK, executing a clear module; a second cluster entry determination module for determining whether the fault-free unconnected RACK satisfies a cluster entry condition; if the fault-free unconnected RACK satisfies the cluster entry condition, executing a second entry module; if the fault-free unconnected RACK does not satisfy the cluster entry condition, executing a second power reduction module; A second injection module injects the fault-free unconnected RACK into the energy storage system.

[0109] Optionally, based on the battery cluster power-on / off control device shown in FIG. 6 above, the charging condition includes: the charging current of the fault-free unconnected RACK is equal to or greater than a preset current threshold.

[0110] Optionally, based on the battery cluster power-on / off control device shown in the above FIG. 6, and combining FIG. 6, the battery cluster power-on / off control device further includes a clear module.

[0111] The clear module clears the power drop count of the energy storage system.

[0112] Optionally, based on the battery cluster power-on / power-off control device shown in FIG. 6 above, the cluster power-on condition includes: a current operating current of the energy storage system is equal to or less than a preset current.

[0113] Optionally, based on the battery cluster power-on / off control device shown in FIG. 6 above, the cluster power-on condition further includes: the energy storage system power drop count is greater than a preset count.

[0114] Optionally, based on the battery cluster power-on / off control device shown in Figure 6 above, by combining Figure 6, the battery cluster power-on / off control device further includes a first power drop module and a second power drop module.

[0115] The first power reduction module reduces the power of the energy storage system and determines again whether the bus voltage of the energy storage system is equal to or greater than the voltage of the non-fault unconnected RACK.

[0116] The second power reduction module reduces the power of the energy storage system and again determines whether the bus voltage of the energy storage system is equal to or lower than the voltage of the non-fault unconnected RACK.

[0117] Optionally, based on the first input module and the second input module shown in FIG. 6 above, the first input module or the second input module specifically: Read the operational information of the fault-free unconnected RACK; Based on the operation information, the fault-free unconnected RACK is input into the energy storage system.

[0118] In addition, the specific principles and execution procedures of each module in the battery cluster power-on / power-off control device disclosed in the above embodiment of the present invention are the same as those in the battery cluster power-on / power-off control method implemented by the present invention, and reference can be made to the corresponding parts in the battery cluster power-on / power-off control method disclosed in the above embodiment of the present invention, and will not be repeated here.

[0119] According to the battery cluster on / off control device provided by the embodiment of the present invention, it is sequentially determined whether the fault-free unconnected RACK of the energy storage system satisfies the charging conditions, whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK satisfies the cluster on-off conditions, and then the fault-free unconnected RACK that satisfies the cluster on-off conditions is on-off into the energy storage system, thereby solving the problem of requiring manual maintenance for fault handling after a battery cluster is on-off from the system due to a fault and improving the automatic management capability of the system.

[0120] An embodiment of the present application further discloses an electronic device for executing a program, which, when executed, performs the battery cluster power-on / power-off control method described in any of the above embodiments.

[0121] For the explanation of the battery cluster power-on / power-off control method, please refer to the corresponding embodiment above, and the explanation will not be repeated here.

[0122] An embodiment of the present application further discloses a computer storage medium, the storage medium including a storage program, which, when executed, controls a device in which the storage medium is disposed to perform the battery cluster power-on / power-off control method described in any of the above embodiments.

[0123] In the context of this application, a computer storage medium may be a tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device. A machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the above. More specific examples of machine-readable storage media include an electrical connection of one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a convenient compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0124] For the explanation of the battery cluster power-on / power-off control method, please refer to the corresponding embodiment above, and the explanation will not be repeated here.

[0125] Those skilled in the art will further recognize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be realized by electronic hardware, computer software, or a combination of both, and that the above description generally describes the configurations and steps of each example according to their functions in order to clearly explain the compatibility between hardware and software. Whether these functions are performed by hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may realize the described functions using different methods for each specific application, but such realizations should not be considered to go beyond the scope of the present application.

[0126] As used herein, relational terms such as "first" and "second" are used solely to distinguish one entity or operation from another and do not require or imply the existence of any such actual relationship or ordering between those entities or operations. Furthermore, the terms "comprise," "comprises," or any other variation thereof are intended to cover a non-exclusive inclusion, whereby a process, method, article, or device comprising a set of elements includes not only those elements but also other elements not expressly listed or inherent in such process, method, article, or device. Absent further limitations, an element defined by the phrase "comprising one or more..." does not exclude the presence of other identical elements in a process, method, article, or device that includes that element.

[0127] The above description of the disclosed embodiments will enable those skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery cluster input / output control method, comprising: [0023] As applied to an energy storage system, the method comprises: Determining whether a fault-free unconnected RACK of the energy storage system satisfies a charging condition; When the fault-free unconnected RACK satisfies the charging condition, determining whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK; When the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK, determining whether the fault-free unconnected RACK satisfies a cluster entry condition; If the fault-free unconnected RACK satisfies a cluster injection condition, injecting the fault-free unconnected RACK into the energy storage system; Including, the charging condition includes that a charging current of the fault-free unconnected RACK is equal to or greater than a preset current threshold; The method, wherein the cluster entry condition includes that the current operating current of the energy storage system is equal to or less than a preset current, or that the number of power drops of the energy storage system is greater than a preset number.

2. Before determining whether the fault-free unconnected RACK of the energy storage system satisfies the charging condition, Determining whether there is a fault-free unconnected RACK in the energy storage system; When there is a fault-free unconnected RACK in the energy storage system, performing a step of determining whether the fault-free unconnected RACK in the energy storage system satisfies a charging condition; The method of claim 1 further comprising:

3. If the fault-free unconnected RACK does not satisfy the charging condition, determining whether the bus voltage of the energy storage system is lower than or equal to the voltage of the fault-free unconnected RACK; When the bus voltage of the energy storage system is equal to or lower than the voltage of the fault-free unconnected RACK, determining whether the fault-free unconnected RACK satisfies a cluster entry condition; If the fault-free unconnected RACK satisfies a cluster injection condition, injecting the fault-free unconnected RACK into the energy storage system; The method of claim 1 further comprising:

4. In the step of determining whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected rack, clearing the power drop count of the energy storage system when the bus voltage of the energy storage system is lower than the voltage of the fault-free unconnected rack; The method of claim 1 further comprising:

5. In the step of determining whether the fault-free unconnected RACK satisfies the cluster entry condition, If the fault-free unconnected RACK does not satisfy the cluster entry condition, reducing the power of the energy storage system, and determining again whether the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK; The method of claim 1 further comprising:

6. The step of inputting the fault-free unconnected RACK into the energy storage system includes: reading the operation information of the fault-free unconnected RACK; Injecting the fault-free unconnected RACK into the energy storage system based on the operation information; 2. The method of claim 1, comprising:

7. A battery cluster input / output control device applied to an energy storage system, a charging determination module for determining whether a fault-free unconnected RACK of the energy storage system satisfies a charging condition; a first voltage determination module for determining whether a bus voltage of the energy storage system is equal to or greater than a voltage of the non-fault unconnected RACK when the non-fault unconnected RACK satisfies a charging condition; a first cluster entry determination module for determining whether the fault-free unconnected RACK satisfies a cluster entry condition when the bus voltage of the energy storage system is equal to or greater than the voltage of the fault-free unconnected RACK; a first injection module for injecting the fault-free unconnected RACK into the energy storage system when the fault-free unconnected RACK satisfies a cluster injection condition; Including, the charging condition includes that a charging current of the fault-free unconnected RACK is equal to or greater than a preset current threshold; The cluster input / output condition includes that the current operating current of the energy storage system is equal to or less than a preset current, or the number of power drops of the energy storage system is greater than a preset number.

8. An electronic device for executing a program, When the program is executed, the battery cluster power-on / power-off control method according to any one of claims 1 to 6 is executed. An electronic device characterized by:

9. 1. A computer storage medium, comprising: The storage medium includes a storage program, and when the storage program is executed, the storage medium controls a device in which the storage medium is disposed to execute the battery cluster power-on / power-off control method described in any one of claims 1 to 6.

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