Battery cluster power-on / 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 the operation of the system, after a battery cluster is faulty and disconnected from the system, the energy storage system is still in use, and due to the dynamic change of the differential pressure, the faulty cluster has few opportunities to meet a small load and to meet the differential pressure to be turned on, and after the battery cluster is faulty and disconnected from the system, it is difficult to be turned on again after the fault is dealt with, which ultimately reduces the charging and discharging capacity of the system and affects the usage and profits of clients.

[0003] In the related art, the battery cluster is controlled to be inserted into or removed from the system by the DC contactor in the high-voltage switch box, but the DC contactor is a mechanical contact, and the insertion and removal of the DC contactor under load directly affects the life of the contactor. In addition, the specifications of the DC contactor provide a service life for different load currents, and in order to guarantee the service life of the DC contactor, there are certain requirements for the voltage at which the battery cluster is inserted and the battery voltage to be inserted when the battery cluster is inserted and removed, and since the pressure difference between the two is large, a large circulation current occurs between the battery cluster at the moment of insertion, which reduces the life of the DC contactor. Therefore, the pressure difference between the two cannot be large, and the pressure difference can be configured by software, and if the pressure difference is greater than the software-set threshold, the battery cluster cannot be inserted into the system. During the operation of the system, after a failure occurs in one of the battery clusters, it is removed from the system, and the system charges and discharges normally, and after the failure processing of the battery cluster, it cannot be inserted into the system due to the pressure difference.

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

[0005] In view of this, an embodiment of the present invention provides a battery cluster power-on / off control method, apparatus, and related devices, which solves the problem of manual maintenance required for fault handling after a battery cluster is powered off from a system due to a fault, and improves the automatic management capability of the system. [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 supply / disconnection 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 non-fault unconnected RACK satisfies a charging condition, 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 bus voltage of the energy storage system is equal to or greater than the voltage of the non-fault non-connected RACK, determining whether the non-fault non-connected 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.

[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; The method further includes: performing, when there is a fault-free unconnected RACK in the energy storage system, determining whether the fault-free unconnected RACK in the energy storage system satisfies a charging condition.

[0008] Optionally, When the non-fault 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 non-fault unconnected RACK; When the bus voltage of the energy storage system is equal to or lower than the voltage of the non-fault non-connected RACK, determining whether the non-fault non-connected RACK satisfies a cluster entry condition; If the fault-free unconnected RACK satisfies a cluster injection condition, the fault-free unconnected RACK is injected 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 a bus voltage of the energy storage system is equal to or greater than the non-fault 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 non-fault unconnected RACK.

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

[0012] Optionally, the cluster entry condition further comprises: an energy storage system power drop count is greater than a preset count.

[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 energy storage system power, and determining again whether the bus voltage of the energy storage system is equal to or higher 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 non-faulty non-connected 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 on / off control device applied to an energy storage system, the device comprising: A charging judgment module for judging whether a 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 meets a charging condition; a first cluster entry judgment module for judging 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 the program is executed, executes a battery cluster power-on / 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 stored program, the stored program, when executed, controlling a device in which the storage medium is disposed to execute a battery cluster power-on / off control method as 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 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 the 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 of the energy storage system meets the charging conditions, whether the bus voltage of the energy storage system is greater than or equal to the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK meets the cluster insertion conditions. Then, the fault-free unconnected RACK that meets the cluster insertion conditions is inserted into the energy storage system, thereby solving the problem of manual maintenance being required for fault handling 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 describe 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 obtain other drawings from these drawings without creative efforts. [Brief description of the drawings]

[0020] [Figure 1] 4 is a flowchart of a battery cluster power-on / off control method according to an embodiment of the present invention. [Diagram 2] 4 is a flow chart of throwing a fault-free unconnected RACK according to an embodiment of the present invention; [Diagram 3] 11 is a flowchart for extracting a faulty RACK according to an embodiment of the present invention. [Figure 4] FIG. 2 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. [Diagram 5] FIG. 2 is a principle diagram of a control policy for introducing a failed battery cluster into a system after the failure is recovered according to an embodiment of the present invention; [Figure 6] 1 is a schematic configuration diagram of a battery cluster power-on / off control device according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The following will clearly and completely describe 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, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0022] In this application, 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 comprises a set of elements includes not only those elements, but also other elements not expressly listed or inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprises a" does not exclude the presence of other identical elements in the process, method, article, or device that comprises the element.

[0023] As can be seen from the background art, in the conventional battery cluster power-on / off control method, after a battery cluster is powered off from the system due to a fault, manual maintenance is required for fault handling, and the system has poor automatic management capability.

[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 a fault-free unconnected RACK in an energy storage system satisfies the charging conditions, whether the bus voltage of the energy storage system is equal to or higher 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 manual maintenance being required 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.

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

[0026] The battery cluster power-on / 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: judge whether the fault-free unconnected RACK in the energy storage system meets the charging condition, if so, execute step S102, if not, execute step S107. In step S101, no fault means that in the RACK automatic insertion and extraction process, after a RACK is extracted from the energy storage system due to a fault, the fault of the failed RACK is restored. 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 practical applications, according to the characteristics of lithium batteries, the battery voltage rises when charging and falls 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] In addition, the specific value of the preset current threshold can be determined according to the actual situation of the battery cluster power-on / off, and is not limited in the present application, and all are 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 executed. If the charging current of the non-fault unconnected RACK in the energy storage system is less than the preset current threshold, it is determined that the non-fault unconnected RACK in 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 meets 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, and if there is no fault-free unconnected RACK in the energy storage system, directly terminating the operation.

[0034] In practical application, in the process of automatic RACK insertion and removal, after a RACK is removed from the energy storage system due to a fault, if the fault of the failed RACK is restored, 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, and conversely, the RACK is considered to be unconnected.

[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 the 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 not, directly end the operation.

[0037] Step S102: judge 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 greater than or equal to the voltage of the fault-free unconnected RACK, step S103 is executed; if the bus voltage of the energy storage system is less 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; if so, execute step S104; if not, execute step S105.

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

[0041] It should be noted that the specific value of the preset current can be determined according to the actual situation of the battery cluster power-on / 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 a power drop count of the energy storage system being greater than a preset number.

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

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

[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, detect the current operating current of the energy storage system, and compare 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 condition, 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 condition, 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 injected 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, and current and voltage information, and the energy storage system makes a logical decision 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, detect the current power of the energy storage system, control the energy storage system to reduce the power to half of the current power, and then judge 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, return 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: judge whether the bus voltage of the energy storage system is lower than or equal to the voltage of the non-fault unconnected RACK, if yes, 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 lower 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 higher than the voltage of the fault-free unconnected RACK, step S106 is executed.

[0060] Step S108: judge 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, detect the current operating current of the energy storage system, and compare the current operating current of the energy storage system 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 executes step S109; 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 executes step S110.

[0063] Alternatively, detect the number of power drops of the energy storage system, compare the number of power drops of the energy storage system with a preset number, and if the number of power drops of the energy storage system is greater than the preset number, determine that the fault-free unconnected RACK meets the cluster entry condition, and execute step S109; if the number of power drops of the energy storage system is less than or equal to the preset number, determine that the fault-free unconnected RACK does not meet the cluster entry condition, and execute step S110.

[0064] Step S109: The fault-free unconnected RACK is injected 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, detect the current power of the energy storage system, control the energy storage system to reduce the power to half of the current power, and then judge 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, return to step S107.

[0068] Based on the battery cluster input / output 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 condition, whether the bus voltage of the energy storage system is equal to or higher than the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK satisfies the cluster input condition, and then the fault-free unconnected RACK that satisfies the cluster input condition is input into the energy storage system, thereby solving the problem of manual maintenance being required for fault handling after the 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. As shown in FIG. 3, the embodiment includes the following steps: Step S301: judge whether there is a faulty RACK in the energy storage system, if yes, execute step S302, if not, 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 on-off process, which affects the operation efficiency of the energy storage system.

[0071] Furthermore, it determines whether there is a faulty RACK in the energy storage system, that is, it determines whether there is a faulty RACK in the energy storage system, and if there is, executes step S302; if not, directly ends the operation.

[0072] In practical applications, a CMU (cell monitor unit, battery cluster management unit) detects the operation information of each RACK in the energy storage system, and detects whether the RACK has a fault based on the operation information of each RACK. If the RACK has a fault, the required power of the RACK is set to 0, and if the RACK has no fault, the required power of the RACK is obtained according to a preset current limit matrix. Then, the CMU 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 failed RACK satisfies the cluster extraction condition. If so, 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] In addition, the specific value of the preset power can be determined according to the actual situation of the power supply and power supply of the battery cluster, and is not limited in the present application, and all of them are 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 extraction 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 extraction 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 it is determined 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 RACK is 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 a 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 RACK number, 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, which is the total number of RACKs by default.

[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 a preset minimum number of RACKs. If the number of connected RACKs is smaller 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 convert 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, the current operating mode of the energy storage system is determined to be a running mode, and the energy storage system is controlled to convert from the running mode to a failure mode.

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

[0089] Step S307: The required power 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 a 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 according to 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: According to the charging and discharging power of the energy storage system, recover 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 according to the calculated charging and discharging power of the energy storage system, and the energy storage system is controlled to operate normally according to the power of the energy storage system.

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

[0096] In order to better understand the above-mentioned cluster cut-out control policy and cluster introduction control policy, as shown in FIG. 4, a principle diagram of the control policy for cutting out a faulty cluster from a system provided by an embodiment of the present invention is shown.

[0097] In FIG. 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 which 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 current connected RACKs, recovers the system power, and operates the system normally; if the number of connected RACKs is smaller than the set minimum number of RACKs, controls the system to extract all RACKs, controls all RACKs to be powered down, controls the system to convert from an operating mode to a 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 corresponding RACK to be powered down according to the command.

[0099] As shown in FIG. 5, after the failure of the failed RACK is recovered, the control policy of entering the system after the failure of the failed RACK is recovered is provided by the 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, execute 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 higher than the RACK voltage to be turned on or off. If it is, 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 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 drops is more than 3 times or the current operating current is less than or equal to 10A. If the condition is not met, reduce the power of the energy storage system to half of the current power and return to step 2; if the condition is met, control the energy storage system to input the RACK that should be input / output, and return to step 1. Step 5: Clear the number of consecutive power drops in the energy storage system, and then go back 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 switched on or off, and 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 power of the energy storage system continuously reduces and the current operating current of the energy storage system, and determines whether the number of continuous power drops of the energy storage system is more than 3 times or the current operating current is less than or equal to 10A. If the condition is not met, reduce the power of the energy storage system to half of the current power, and return to step 2; if the condition is met, control the energy storage system to turn on the RACK that should be turned on or off, and return to step 1. Step 8: Clear the number of consecutive power drops in the energy storage system, and then go back to step 1.

[0101] The above-mentioned battery cluster power-on / off control method thoroughly solves the problem that manual intervention is required to close the battery cluster after it is disconnected from the system due to a fault, and reduces the maintenance and operation costs of the system. In addition, when power-on / off is performed, the voltage change characteristics of the lithium iron battery after the power drop are taken into consideration, and the power-on / off time can be effectively reduced by three consecutive step-down power drops, maximizing the system utilization rate and ensuring the profits of clients. In addition, the intelligent management ability of the system can be improved without increasing the hardware cost.

[0102] Based on the battery cluster input / output separation control method provided by the embodiment of the present invention, when a faulty RACK exists in the energy storage system and the faulty RACK satisfies the cluster extraction condition, the faulty RACK is separated 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 condition, the bus voltage of the energy storage system is equal to or higher than the voltage of the fault-free unconnected RACK, and the fault-free unconnected RACK satisfies the cluster input condition, and then the fault-free unconnected RACK that satisfies the cluster input condition is input into the energy storage system, thereby solving the problem of needing 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.

[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 input judgment module 603, and a first input 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 executes a first voltage judgment module 602 if the fault-free unconnected RACK meets the charging conditions, and executes a second voltage judgment module if the fault-free unconnected RACK does not meet the charging conditions. The first voltage judgment module 602 judges whether the bus voltage of the energy storage system is greater than or equal to the voltage of the non-fault unconnected RACK, and if the bus voltage of the energy storage system is greater than or equal to the voltage of the non-fault unconnected RACK, executes the first cluster input judgment module 603, and if the bus voltage of the energy storage system is less than the voltage of the non-fault unconnected RACK, executes a clear module. The first cluster entry judgment module 603 judges whether the fault-free, unconnected RACK satisfies the cluster entry condition, and executes a first entry module if the fault-free, unconnected RACK satisfies the cluster entry condition, and executes a first power drop module if the fault-free, unconnected RACK does not satisfy the cluster entry condition. 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 FIG. 6 above, before the charging judgment module 601 judges whether the fault-free unconnected RACK of the energy storage system meets the charging condition, in combination with FIG. 6, the battery cluster power-on / off control device further includes a first judgment module.

[0106] The first judgment module judges 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 judgment module 601;

[0107] Optionally, based on the battery cluster power-on / off control device shown in FIG. 6 above, by combining FIG. 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 judgment module judges whether a bus voltage of the energy storage system is equal to or lower than a voltage of the non-fault unconnected RACK, and if the bus voltage of the energy storage system is equal to or lower than a voltage of the non-fault unconnected RACK, executes a second cluster input judgment module; if the bus voltage of the energy storage system is higher than a voltage of the non-fault unconnected RACK, executes a clear module; A second cluster entry judgment module judges whether the non-faulty unconnected RACK satisfies a cluster entry condition, and if the non-faulty unconnected RACK satisfies the cluster entry condition, executes a second entry module; if the non-faulty unconnected RACK does not satisfy the cluster entry condition, executes a second power drop 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: a charging current of the non-fault 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, combining FIG. 6, the battery cluster power-on / off control device further includes a clear module.

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

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

[0114] Optionally, based on the battery cluster power-on / off control device shown in FIG. 6 above, combining FIG. 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 greater than or equal to the voltage of the non-fault unconnected RACK.

[0116] A second power reduction module reduces the power of the energy storage system and determines again whether the bus voltage of the energy storage system is less than or equal to 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 operation information of the non-faulty non-connected RACK; Based on the operation information, the fault-free unconnected RACK is injected into the energy storage system.

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

[0119] According to the battery cluster on-off / off-connection control device provided by an embodiment of the present invention, after sequentially determining 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 higher than the voltage of the fault-free unconnected RACK, and whether the fault-free unconnected RACK satisfies the cluster on-connection conditions, the fault-free unconnected RACK that satisfies the cluster on-connection conditions is on-connected to the energy storage system, thereby solving the problem of needing manual maintenance for fault handling after the battery cluster is on-connected 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 the program is executed, performs the battery cluster power-on / off control method described in any of the above embodiments.

[0121] For an explanation of the battery cluster power-on / 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 stored program, which, when executed, controls a device in which the storage medium is disposed to perform a battery cluster power-on / 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, capable of containing or storing 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 by 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 disk 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 / off control method, please refer to the corresponding embodiment above, and it will not be repeated here.

[0125] A person skilled in the art can 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 in order to clearly describe the compatibility of hardware and software, the above description generally describes the configurations and steps of each example according to their functions. Whether these functions are performed by hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can realize the described functions using different methods for each specific application, but such realization should not be considered to go beyond the scope of the present application.

[0126] In this application, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not require or imply that any such actual relationship or sequence exists between those entities or operations. And the terms "comprise", "comprises", 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 recited or elements inherent in such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "including one..." does not exclude the presence of other identical elements in the process, method, article, or device that includes the element.

[0127] The above description of the disclosed embodiments enables one skilled in the art to realize 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 power-on / off control method, comprising: [0023] In accordance with the present invention, the method is applied to an energy storage system, the method comprising: Determining whether a fault-free unconnected RACK of the energy storage system satisfies a charging condition; When the fault-free unconnected RACK satisfies a charging condition, determining whether a bus voltage of the energy storage system is equal to or greater than a 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 non-fault non-connected RACK, determining whether the non-fault non-connected RACK satisfies a cluster entry condition; If the fault-free unconnected RACK satisfies a cluster injection condition, the fault-free unconnected RACK is injected into the energy storage system; The method according to claim 1, further comprising:

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

4. The charging condition includes that a charging current of the non-fault unconnected RACK is equal to or greater than a preset current threshold value.

4. The method according to claim 1 or 3.

5. 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:

6. The cluster input condition includes that a current operating current of the energy storage system is equal to or less than a preset current; 4. The method according to claim 1 or 3.

7. The cluster input condition further includes that the number of power drops of the energy storage system is greater than a preset number.

4. The method according to claim 1 or 3.

8. In the step of determining whether the fault-free non-connected RACK satisfies a 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 higher than the voltage of the fault-free unconnected RACK; The method according to claim 1 or 3, further comprising:

9. The step of injecting the fault-free unconnected RACK into the energy storage system includes: reading the operation information of the non-fault non-connected RACK; injecting the fault-free unconnected RACK into the energy storage system based on the operation information; 4. The method according to claim 1 or 3, comprising:

10. A battery cluster input / output control device applied to an energy storage system, comprising: A charging judgment module for judging whether a 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 input determination module for determining whether the non-fault non-connected RACK satisfies a cluster input condition when a bus voltage of the energy storage system is equal to or greater than a voltage of the non-fault non-connected RACK; a first input module for inputting the non-fault non-connected RACK into the energy storage system when the non-fault non-connected RACK satisfies a cluster input condition; A battery cluster power-on / off control device comprising:

11. An electronic device for executing a program, When the program is executed, the battery cluster power-on / off control method according to any one of claims 1 to 9 is executed.

1. An electronic device comprising:

12. 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 / off control method described in any one of claims 1 to 9. A computer storage medium.

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