Energy storage system, control method and related device

Abstract

The invention discloses an energy storage system, a control method and a related device, the energy storage system comprises a controller and m inverters, each inverter is connected with a corresponding battery cluster unit, each battery cluster unit comprises a plurality of battery clusters, each inverter and the corresponding battery cluster unit form a battery unit, and m is an integer greater than or equal to 2; the controller is used for controlling a first inverter in a first battery unit and a corresponding first battery cluster unit to be started under the condition that the energy storage system is shut down and the first battery unit in the m battery units is not started, and if the first inverter is not started or the first battery cluster unit is in a non-operation state, the first inverter in the first battery unit and the corresponding first battery cluster unit are started. And if yes, determining that the first battery unit is an abnormal battery unit. Thus, the configuration relation between the inverter and the battery cluster unit is checked, the battery cluster unit is prevented from being overcharged or overdischarged due to wrong configuration, and the safety and reliability of the energy storage system are improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an energy storage system, a control method and related devices. Background Art

[0002] The current energy storage system includes multiple inverters and multiple battery clusters, and each inverter is connected to multiple corresponding battery clusters. However, there may be hardware wiring errors or software configuration errors between the inverter and the battery cluster, which may cause the battery cluster to overcharge or over-discharge, reducing the safety and reliability of the energy storage system. Summary of the invention

[0003] Based on the above problems, the present application provides an energy storage system, a control method and related devices, aiming to solve the problems of low safety and reliability of the energy storage system.

[0004] The embodiments of the present application disclose the following technical solutions:

[0005] In a first aspect, an embodiment of the present application provides an energy storage system, comprising: a controller and m inverters, each inverter being connected to a corresponding battery cluster unit, the battery cluster unit comprising a plurality of battery clusters, each inverter and the corresponding battery cluster unit forming a battery unit, and m being an integer greater than or equal to 2;

[0006] The controller is used to control the first inverter in the first battery unit and the corresponding first battery cluster unit to start up when the energy storage system is shut down and the first battery unit among the m battery units is not started up. If there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state, the first battery unit is determined to be an abnormal battery unit.

[0007] Optionally, the controller is also used to control the first inverter of the first battery unit to charge or discharge according to the target power when the energy storage system is shut down and the first battery unit is turned on, and to determine whether the first battery unit is an abnormal battery unit according to the target power and the changed power of the first battery cluster unit.

[0008] Optionally, the controller is used to determine that the first battery cell is an abnormal battery cell if the changed power exceeds a preset power range; the preset power range is obtained based on the target power.

[0009] Optionally, the controller is further used to determine that the first battery cell is an abnormal battery cell if there is a second battery cell whose DC side voltage is not zero among the m battery cells when the energy storage system is shut down and the first battery cell is turned on.

[0010] Optionally, the controller is further used to determine that the first battery unit is an abnormal battery unit if the DC side voltage of the first inverter of the first battery unit is less than a preset voltage when the energy storage system is shut down and the first battery unit is turned on.

[0011] Optionally, the controller is further used to: before controlling the first inverter to charge or discharge according to the target power, obtain the remaining power of the first battery cluster unit, if the remaining power is greater than the preset power, send a discharge instruction to the first inverter, the discharge instruction indicates that the target power is the first power; if the remaining power is less than or equal to the preset power, send a charge instruction to the first inverter, the charge instruction indicates that the target power is the second power;

[0012] The controller is used to control the first inverter to discharge according to the first power according to the discharge instruction, or control the first inverter to charge according to the second power according to the charge instruction.

[0013] Optionally, the controller is further used to determine that the first battery cell is an abnormal battery cell if the first inverter does not respond or the contactor of the first battery cluster unit does not respond after controlling the first inverter in the first battery cell and the corresponding first battery cluster unit to start up.

[0014] Optionally, the controller is further used to send a number corresponding to the abnormal battery cell after determining the abnormal battery cell.

[0015] In a second aspect, an embodiment of the present application provides a control method for an energy storage system, the energy storage system comprising: a controller and m inverters, each inverter being connected to a corresponding battery cluster unit, the battery cluster unit comprising a plurality of battery clusters, each inverter and the corresponding battery cluster unit forming a battery unit, and m being an integer greater than or equal to 2;

[0016] Control methods include:

[0017] When the energy storage system is shut down and the first battery unit among the m battery units is not powered on, controlling the first inverter in the first battery unit and the corresponding first battery cluster unit to power on;

[0018] If there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state, the first battery unit is determined to be an abnormal battery unit.

[0019] Optionally, the method further comprises:

[0020] When the energy storage system is shut down and the first battery unit is turned on, controlling the first inverter to charge or discharge according to the target power;

[0021] It is determined whether the first battery cell is an abnormal battery cell according to the target power and the changed power of the first battery cluster cell corresponding to the first inverter.

[0022] Optionally, judging whether the first battery cell is an abnormal battery cell according to the target power and the changed power of the first battery cluster cell corresponding to the first inverter includes:

[0023] If the changed power exceeds a preset power range, the first battery cell is determined to be an abnormal battery cell; the preset power range is obtained based on the target power.

[0024] Optionally, it also includes: when the energy storage system is shut down and the first battery unit is turned on, if there is a second battery unit whose DC side voltage is not zero among the m battery units, determining that the first battery unit is an abnormal battery unit.

[0025] Optionally, it also includes: when the energy storage system is shut down and the first battery unit is turned on, if the DC side voltage of the first inverter of the first battery unit is less than a preset voltage, determining that the first battery unit is an abnormal battery unit.

[0026] Optionally, it also includes:

[0027] Before controlling the first inverter to charge or discharge according to the target power, obtaining the remaining power of the first battery cluster unit;

[0028] If the remaining power is greater than the preset power, a discharge instruction is sent to the first inverter, the discharge instruction indicating that the target power is the first power;

[0029] If the remaining power is less than or equal to the preset power, a charging instruction is sent to the first inverter, and the charging instruction indicates that the target power is the second power;

[0030] Controlling the first inverter to charge or discharge according to the target power includes:

[0031] The first inverter is controlled to discharge at the first power according to the discharge instruction, or the first inverter is controlled to charge at the second power according to the charge instruction.

[0032] Optionally, it also includes: after controlling the first inverter in the first battery unit and the corresponding first battery cluster unit to start up, if the first inverter does not respond or the contactor of the first battery cluster unit does not respond, determining that the first battery unit is an abnormal battery unit.

[0033] Optionally, the method further includes: after determining the abnormal battery cell, sending the number corresponding to the abnormal battery cell.

[0034] In a third aspect, an embodiment of the present application provides a control device, comprising a processor and a memory, wherein the processor is connected to the memory, the memory is used to store programs, instructions or codes, and the processor is used to execute the programs, instructions or codes in the memory to complete the control method of the energy storage system as described in the second aspect.

[0035] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program, wherein the computer program is loaded by a processor to execute the control method of the energy storage system as described in the second aspect.

[0036] The energy storage system provided by the embodiment of the present application includes a controller and m inverters, each inverter is connected to a corresponding battery cluster unit, the battery cluster unit includes multiple battery clusters, each inverter and the corresponding battery cluster unit constitute a battery unit, and m is an integer greater than or equal to 2; the controller is used to control the first inverter in the first battery unit and the corresponding first battery cluster unit to start up when the energy storage system is shut down and the first battery unit in the m battery units is not turned on, and if the first inverter is not turned on or the first battery cluster unit is in a non-operating state, the first battery unit is determined to be an abnormal battery unit. In this way, the configuration relationship between the inverter and the battery cluster unit is checked to avoid overcharging or overdischarging of the battery cluster unit due to incorrect configuration, thereby improving the safety and reliability of the energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0038] Figure 1 A schematic diagram of a DC-side parallel energy storage system provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

[0040] Figure 3 A schematic diagram of a flow chart of a control method for an energy storage system provided in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of a control process of an energy storage system provided in an embodiment of the present application;

[0042] Figure 5 A schematic diagram of a control process of another energy storage system provided in an embodiment of the present application;

[0043] Figure 6 A schematic diagram of the structure of a control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0044] In order to explain the relationship between the inverter and the battery cluster, Figure 1 As shown, the energy storage system can be a DC-side parallel energy storage system, in which one energy storage inverter PCS (e.g., model SC5000UD, rated power 5000kw) can be equivalent to four power-divided inverters (e.g., model SC1250UD, rated power 1250kw). Each inverter is connected to 12 battery clusters on the DC side, and each 12 battery clusters constitute a battery cluster unit, that is, the battery cluster unit corresponds to the inverter one by one; wherein, the rated capacity of a battery cluster unit can be 5015kwh.

[0045] The DC power lines between each inverter and the corresponding multiple battery clusters must be correctly connected, and the software configuration between the inverter and the corresponding battery unit must be correct to ensure the normal operation of the system. However, staff may make mismatches during hardware wiring or software configuration.

[0046] As an example, combining Figure 1 As shown, it is assumed that inverter 1 should be connected to 12 battery clusters in battery cluster unit 1, but due to wiring error, inverter 1 is connected to 11 battery clusters in battery cluster unit 1, and the 12th battery cluster is connected to inverter 2; if the corresponding battery cluster unit 2 is charged through inverter 2 at this time, since the 12th battery cluster is connected to inverter 2, the 12th battery cluster will be charged while charging the battery cluster unit 2. Assuming that the 12th battery cluster is fully charged, the 12th battery cluster will be overcharged.

[0047] As another example, combining Figure 1 As shown, it is assumed that inverter 1 should be connected to the 12 battery clusters in battery cluster unit 1, and the wiring is correct, but inverter 1 is connected to battery cluster unit 2, and inverter 2 is connected to battery cluster unit 1 during software configuration; if the corresponding battery cluster unit 2 is discharged through inverter 2 at this time, since the battery cluster unit corresponding to inverter 2 is configured as battery cluster unit 1 during software configuration, the actual control is to discharge battery cluster unit 1 through inverter 2. Assuming that the power of battery cluster unit 1 has reached the minimum power, it will cause battery cluster unit 1 to be over-discharged.

[0048] From the above examples, it can be seen that there may be hardware wiring errors or software configuration errors between the inverter and the battery cluster, which may cause the battery cluster in the battery cluster unit to be overcharged or over-discharged, reducing the safety and reliability of the energy storage system.

[0049] In order to solve the above problems, an embodiment of the present application provides an energy storage system, a control method and related devices, wherein the energy storage system includes a controller and m inverters, each inverter is connected to a corresponding battery cluster unit, the battery cluster unit includes multiple battery clusters, each inverter and the corresponding battery cluster unit constitute a battery unit, and m is an integer greater than or equal to 2; the controller is used to control the first inverter in the first battery unit and the corresponding first battery cluster unit to start up when the energy storage system is shut down and the first battery cell among the m battery cells is not turned on, and if there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state, the first battery cell is determined to be an abnormal battery cell.

[0050] In this way, the configuration relationship between the inverter and the battery cluster unit can be checked to avoid overcharging or overdischarging of the battery cluster unit due to incorrect configuration, thereby improving the safety and reliability of the energy storage system.

[0051] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0052] See also Figure 2 , which is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application, combined with Figure 1 As shown, the energy storage system 20 provided in the embodiment of the present application may include: a controller 21 and m inverters 22, each inverter 22 is connected to a corresponding battery cluster unit, the battery cluster unit includes a plurality of battery clusters, each inverter 22 and the corresponding battery cluster unit constitute a battery unit, and m is an integer greater than or equal to 2.

[0053] Energy storage system refers to a system that stores energy through battery clusters and converts the stored energy back into electrical energy or other forms of energy for use when needed. Inverter is a power conversion device, and its main function is to convert direct current (DC) into alternating current (AC).

[0054] A battery cluster refers to a battery combination that is connected in series, parallel, or series-parallel and can operate independently after being connected to an inverter. The battery cluster is an important component of the energy storage system. The battery cluster is used to store electrical energy and release it when needed. The battery cluster can smooth power output, reduce power fluctuations, and improve power quality and reliability.

[0055] A battery cluster unit refers to a unit composed of multiple battery clusters. Each battery cluster unit corresponds to an inverter. The number of battery clusters included in each battery cluster unit is not limited here, and the specific number can be determined according to actual needs or application scenarios.

[0056] It should be understood that in the embodiment of the present application, m battery units may be included, each battery unit may include an inverter and a battery cluster unit, and each battery cluster unit may include multiple battery clusters.

[0057] The controller 21 is used to control the first inverter 22 in the first battery cell and the corresponding first battery cluster unit to start up when the energy storage system is shut down and the first battery cell among the m battery cells is not started up. If there is no voltage on the DC side of the first inverter 22 or the first battery cluster unit is in a non-operating state, the first battery cell is determined to be an abnormal battery cell.

[0058] The controller means a main command device that changes the wiring of the main circuit or control circuit and the resistance value in the circuit in a predetermined order to control the starting, speed regulation, braking and reversing of the motor. The controller is a "decision-making body" that issues commands and is used to coordinate and schedule the operation of the entire energy storage system. In the embodiment of the present application, the controller can be a controller in the inverter, a controller of the energy storage system, or a separate external controller. The controller is not specifically limited here.

[0059] The shutdown of the energy storage system means that the energy storage system is in a non-working state. It should be understood that if the energy storage system is in a working state, then all inverters and corresponding battery cluster units will be in a working state. It is difficult to determine which inverters and battery cluster units have hardware wiring errors or software configuration errors. Therefore, each embodiment of the present application needs to be implemented when the energy storage system is shut down.

[0060] The non-operation state means a state where a voltage exists at the output terminal of the battery cluster unit but no current exists.

[0061] It should be understood that, when the wiring is normal and there are no faults, when the first inverter and the corresponding first battery cluster unit are turned on, the contactor corresponding to the first battery cluster unit is closed in response to the power-on command, and there is voltage at the output end of the first battery cluster unit. Since the first battery cluster unit is connected to the first inverter via the closed contactor to form a closed loop, there is current at the output end of the first battery cluster unit.

[0062] However, when there is a hardware wiring error or a software configuration error between the first inverter and the first battery cluster unit (taking the hardware wiring error as an example, assuming that the first battery cluster unit is connected to the second inverter), after the contactor corresponding to the first battery cluster unit is closed, there is voltage at the output end of the first battery cluster unit, but because the first battery cluster unit is connected to the second inverter and the second inverter is not turned on, there is no current at the output end of the first battery cluster unit.

[0063] It should be understood that by controlling the first inverter of the first unit and the corresponding first battery cluster unit to start up, it is determined whether there is voltage on the DC side of the first inverter and whether the first battery cluster unit is in operation.

[0064] In one example, if the hardware wiring is incorrect (the first battery cluster unit is connected to other inverters, and the first inverter is connected to other battery cluster units), the DC side of the corresponding first inverter has no voltage because the other battery cluster units are not powered on; or the DC side of the first inverter has no voltage because the first battery cluster unit does not power the first inverter.

[0065] In another example, if the hardware wiring is incorrect (the first battery cluster unit is connected to other inverters, and the first inverter is connected to other battery cluster units), the other battery cluster units connected to the first inverter will be configured as the corresponding "first battery cluster unit" during software configuration. Then the controller controls the first unit to start up, but actually turns on the first inverter and the "first battery cluster unit", and does not turn on the first battery cluster unit corresponding to the first inverter, which causes the first battery cluster unit to be in a non-operating state.

[0066] In another example, if the hardware wiring is correct but the software configuration is incorrect (the first inverter is configured with other battery cluster units and / or the first battery cluster unit is configured with other inverters), the controller controls the first battery unit to turn on, which actually turns on the first inverter and other battery cluster units, or turns on other inverters and the first battery cluster unit, or turns on other inverters and other battery cluster power supplies, so that there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state.

[0067] Therefore, in the embodiment of the present application, the unpowered battery cells are powered on one by one to determine whether there is voltage on the DC side of the inverter in the current battery cell (e.g., the first battery cell) and whether the battery cluster unit is in operation, so as to identify the battery cells with hardware wiring errors or software configuration errors as abnormal battery cells. The configuration relationship between the inverter and the battery cluster unit is checked to avoid overcharging or overdischarging of the battery cluster unit due to incorrect configuration, thereby improving the safety and reliability of the energy storage system.

[0068] Based on the energy storage system provided in the above embodiment, in a possible implementation, the controller 21 is further configured to determine that the first battery cell is an abnormal battery cell if the first inverter 22 does not respond or the contactor of the first battery cluster unit does not respond.

[0069] The inverter is not responding, which means that the switch of the inverter does not close in response to the power-on command, thereby causing the inverter to be unable to be in a working state; the contactor of the battery cluster unit is not responding, which means that the contactor between the battery cluster unit and the inverter, which is used to achieve conduction and disconnection, does not close in response to the power-on command.

[0070] The power-on instruction refers to an instruction for controlling the first inverter 22 in the first battery unit and the corresponding first battery cluster unit to start up.

[0071] It should be understood that in the present implementation, after the controller controls the first battery unit to start up, there may be no voltage on the DC side of the first inverter or the battery cluster unit may be in a non-operating state due to a hardware failure. Therefore, the controller can check the hardware of the inverter and the contactor to determine the first battery cell in which the first inverter is not turned on or the contactor of the first battery cluster unit is not closed as an abnormal battery cell. On the basis of identifying hardware wiring errors or software configuration errors, the controller can further identify hardware failures to improve the safety and reliability of the system.

[0072] Based on the energy storage system provided in the above embodiment, in another possible implementation, the controller 21 is also used to determine that the first battery unit is an abnormal battery unit if the DC side voltage of the first inverter 22 of the first battery unit is less than a preset voltage when the energy storage system is shut down and the first battery unit is turned on.

[0073] The first battery unit being turned on means that the first inverter and the corresponding first battery cluster unit are turned on.

[0074] The preset voltage refers to the condition for determining whether there is voltage on the DC side of the inverter. For example, the preset voltage can be 10V. If it is greater than or equal to 10V, it is considered that there is a DC side voltage, otherwise it is considered that there is no DC side voltage. It should be understood that in some cases, even if the inverter and the battery cluster unit are connected incorrectly, there may still be some voltage. For example, the energy storage system has just stopped and the DC side voltage of the inverter has not dropped to zero. In order to improve the accuracy of the inspection, a DC side voltage less than the preset voltage can be considered as the absence of the DC side voltage.

[0075] It should be understood that when there is a hardware connection error or a software configuration error between the inverter and the battery cluster unit, the DC side voltage of the inverter may be lower than the preset voltage. In this way, it is possible to determine whether there is a hardware connection error or a software configuration error between the first inverter and the first battery cluster unit by judging whether the DC side voltage of the first inverter is lower than the preset voltage.

[0076] As an example, taking hardware wiring error as an example, inverter 1 is connected to battery cluster unit 2, and inverter 2 is connected to battery cluster unit 1. If inverter 1 is turned on and the contactor of battery cluster unit 1 is closed, it is considered that the first battery unit has been turned on. However, since the contactor of battery cluster unit 2 is not closed, battery cluster unit 1 is connected to inverter 2, there will be no voltage on the DC side of inverter 1, that is, the DC side voltage of inverter 1 is zero, thereby determining that inverter 1 and battery cluster unit 1 are incorrectly connected.

[0077] In an embodiment of the present application, by determining whether the DC side voltage of the first inverter of the first battery unit is less than a preset voltage, the configuration relationship between the first inverter and the first battery cluster unit is checked to avoid overcharging or overdischarging of the battery cluster unit due to incorrect configuration, thereby improving the safety and reliability of the energy storage system.

[0078] Based on the energy storage system provided by the above embodiments, in some possible cases, the inverter and the battery cluster unit are not completely hardware wiring errors or software configuration errors, but there are partial hardware wiring errors or partial software configuration errors. At this time, it is difficult for the above embodiments to determine the battery unit with partial hardware wiring errors or partial software configuration errors.

[0079] As an example, assuming that inverter 1 is connected to battery cluster unit 1 composed of 12 battery clusters, and inverter 2 is connected to battery cluster unit 2 composed of 12 battery clusters, if the hardware wiring is wrong, inverter 1 may be connected to 10 battery clusters in battery cluster unit 1, and inverter 2 may be connected to 2 battery clusters in battery cluster unit 1 and 12 battery clusters in battery cluster unit 2; if the software configuration is wrong and the hardware connection is correct, inverter 1 may be configured with 10 battery clusters in battery cluster unit 1, and inverter 2 may be configured with 2 battery clusters in battery cluster unit 1 and 12 battery clusters in battery cluster unit 2. In such a case, when inverter 1 and the corresponding battery cluster unit 1 are closed, in the case of hardware wiring error, there is voltage on the DC side of inverter 1, and the battery cluster unit is in operation; similarly, in the case of software configuration error, there is voltage on the DC side of inverter 1, and the battery cluster unit is in operation.

[0080] In order to solve the above technical problems, in a possible implementation method, the controller 21 is also used to control the first inverter 22 of the first battery unit to charge or discharge according to the target power when the energy storage system is shut down and the first battery unit is turned on, and to determine whether the first battery unit is an abnormal battery unit according to the target power and the changed power of the first battery cluster unit corresponding to the first inverter 22.

[0081] The target power refers to a preset charging power or a preset discharging power. Whether the first inverter charges or discharges according to the target power can be determined according to the remaining power of the first battery cluster unit.

[0082] Therefore, in one possible implementation, before the first inverter 22 controlling the first battery unit performs charging or discharging according to the target power, the controller 21 is also used to obtain the remaining power of the first battery cluster unit of the first battery unit; if the remaining power is greater than the preset power, a discharge instruction is sent to the first inverter 22, and the discharge instruction indicates that the target power is the first power; if the remaining power is less than or equal to the preset power, a charging instruction is sent to the first inverter 22, and the charging instruction indicates that the target power is the first power.

[0083] Correspondingly, the controller 21 is used to control the first inverter 22 to discharge at the first power according to the discharge instruction, or to control the first inverter 22 to charge at the first power according to the charging instruction.

[0084] The remaining capacity refers to the amount of power currently available in the battery cluster unit, and the remaining capacity reflects the ability of the battery cluster unit to continue to supply power. The remaining capacity is a relative value, which can generally be expressed as a percentage, and the percentage is calculated based on the nominal (rated) capacity of the battery. For example, if the nominal capacity of the battery cluster unit is 100Ah, and the current remaining capacity is 50%, it means that there is 50Ah of power available in the battery cluster unit.

[0085] Among them, in a possible implementation, the remaining power can be obtained according to the state of charge SOC of the battery cluster unit. SOC (State of Charge, state of charge or remaining capacity) refers to the ratio of the remaining power in the battery to its nominal capacity, also expressed as a percentage. The calculation formula of SOC is usually: SOC = remaining power / nominal capacity × 100%. Alternatively, if the power that has been discharged by the battery cluster unit after the last charge is taken into account, SOC can also be expressed as: SOC = remaining power / (discharged power + remaining power) × 100%.

[0086] The preset power level refers to a value used to determine whether to send a charging instruction or a discharging instruction, such as 50%, 60%, etc., which is not specifically limited here.

[0087] The discharge instruction refers to an instruction for controlling the second inverter to discharge according to the first power. The first power refers to the discharge power under the discharge instruction. For example, the first power may be 5% of the rated discharge power of the second inverter.

[0088] The charging instruction refers to an instruction for controlling the second inverter to charge according to the second power, and the second power refers to the charging power under the charging instruction. For example, the second power may be 5% of the rated charging power of the second inverter.

[0089] It should be understood that the remaining power of the battery cluster unit is generally maintained within a safe range, such as 20% to 90%. In order to avoid overcharging or over-discharging of the battery cluster unit during the detection process, the embodiment of the present application can be determined based on the remaining power of the battery cluster unit, that is, discharging when the remaining power of the second battery cluster unit is greater than the preset power, and charging when the remaining power of the second battery cluster unit is less than the preset power, so as to ensure the safety and reliability of the battery cluster unit.

[0090] Among them, after the controller controls the second inverter to charge or discharge according to the target power, the output power of the second battery cluster unit will change with the change of charging or discharging. Therefore, it is possible to judge whether the second battery cell is an abnormal battery cell based on the target power and the changed power of the second battery cluster unit corresponding to the second inverter.

[0091] The variable power refers to the change in output power of the second battery cluster unit within a preset time when the second battery cluster unit is charged or discharged. The preset time refers to the time for collecting the output power of the second battery cluster unit during charging or discharging, such as 5 seconds, 10 seconds, etc., which is not specifically limited here.

[0092] In a possible implementation, the controller 21 is configured to determine that the first battery cell is an abnormal battery cell if the changed power exceeds a preset power range.

[0093] The preset power range means the power range of the battery unit that meets the non-abnormal conditions, wherein the preset power range is obtained based on the target power. As a possible implementation, the lower limit of the preset power range may be the difference between the absolute value of the target power and the absolute value of the fluctuating power, and the upper limit of the preset power range may be the sum of the absolute value of the target power and the absolute value of the fluctuating power, the fluctuating power being the product of the target power and the preset proportional coefficient, and the preset proportional coefficient may be determined according to the requirements.

[0094] As an example, assuming that the target power is P2, the fluctuating power is P3, the fluctuating power P3 = P2×10%, the lower limit of the preset power range is |P2|-|P3|, and the upper limit of the preset power range is |P2+|P3|, then the preset power range is |P2|-|P3|<|P1|<|P2|+|P3|, where P1 represents the absolute value of the varying power.

[0095] It should be understood that if there are some hardware wiring errors or some software configuration errors between the inverter and the battery cluster unit, the output power of the battery cluster unit will be inconsistent with the target power of the inverter. For example, taking some hardware wiring errors as an example, if one inverter corresponds to 12 battery clusters, inverter 1 is connected to 6 battery clusters of battery cluster unit 1, and inverter 2 is connected to 18 battery clusters of the battery cluster unit (6 of which are battery clusters of battery cluster unit 1), then when inverter 1 is charged, only 6 battery clusters in battery cluster unit 1 are charged. At this time, since the inverter is connected to 6 battery clusters, the output power of the corresponding battery cluster unit 1 will be less than the preset power range, that is, the output power of the battery cluster unit 1 is inconsistent with the charging power (target power) of the inverter.

[0096] Therefore, in an embodiment of the present application, after controlling the first battery unit to start up, the controller can control the first inverter to charge or discharge according to the target power, and then determine whether the output power of the first battery cluster unit is within the preset power range. If the output power is not within the preset power range, it can be determined that there are some hardware wiring errors or some software configuration errors between the first inverter and the first battery cluster unit.

[0097] The embodiment of the present application improves the safety and reliability of the energy storage system by further controlling the inverter to charge or discharge according to the target power after the battery unit is turned on, and then judging whether the output power of the battery cluster unit exceeds the preset power range to judge whether there is an error in the battery unit (hardware wiring error or software configuration error).

[0098] Based on the energy storage system provided by the above embodiments, in some possible cases, the inverter and the battery cluster unit are not completely hardware wiring errors or software configuration errors, but there are partial hardware wiring errors or partial software configuration errors. At this time, it is difficult for the above embodiments to determine the battery unit with partial hardware wiring errors or partial software configuration errors.

[0099] In order to solve the above technical problems, in another possible implementation method, the controller 21 is also used to determine that the first battery cell is an abnormal battery cell if there is a second battery cell with a DC side voltage of zero on the second inverter among the m battery cells when the energy storage system is shut down and the first battery cell is turned on.

[0100] The DC side voltage refers to the voltage on the side where the inverter is connected to the battery cluster unit. When the wiring is normal, the software configuration is normal, and there is no fault, when the inverter is turned on and the contactor of the battery cluster unit is closed, there should be voltage on the DC side of the inverter.

[0101] It should be noted that in the case where there are partial wiring errors or partial software configuration errors between the inverter and the battery cluster unit, in addition to the battery unit that is currently powered on, there will also be voltage on the DC side of the incorrectly wired or incorrectly configured battery unit, that is, the DC side voltage of the second inverter of the second battery unit is not zero.

[0102] As an example, taking partial hardware wiring errors as an example, if an inverter corresponds to 12 battery clusters, inverter 1 is connected to 11 battery clusters of battery cluster unit 1, and inverter 2 is connected to 13 battery clusters of battery cluster unit (one of which is the battery cluster of battery cluster unit 1). At this time, if inverter 1 is turned on and the contactor of battery cluster unit 1 is closed, due to hardware wiring errors, there will also be voltage on inverter 2, that is, the DC side voltage of inverter 2 is not zero.

[0103] In an embodiment of the present application, by judging whether the DC side voltage of the inverter of other battery cells (second battery cells) except the first battery cell is zero, it is determined whether there is a wiring error between the first inverter and the first battery cluster unit, and the configuration relationship between the inverter and the battery cluster unit is checked to avoid overcharging or over-discharging of the battery cluster unit due to incorrect configuration, thereby improving the safety and reliability of the energy storage system.

[0104] Based on the energy storage system provided by any of the above embodiments, in some possible implementations, the controller 21 is further configured to send a serial number corresponding to the abnormal battery cell after determining the abnormal battery cell.

[0105] The controller may send the number corresponding to the abnormal battery cell to the host computer, or send the number corresponding to the abnormal battery cell to other devices, wherein the controller has a communication connection with the host computer or other devices, which is not specifically limited here.

[0106] It should be understood that the controller sends the number corresponding to the abnormal battery cell to the host computer or other equipment so that the abnormal battery cell can be displayed to the maintenance personnel through the host computer or other equipment, which facilitates the maintenance personnel to carry out inspection and maintenance, improves the efficiency of manual maintenance, and reduces the difficulty of maintenance.

[0107] In addition, after determining the abnormal battery cell, the controller can also obtain and send the serial number corresponding to the abnormal battery cell to facilitate maintenance personnel to carry out inspection and maintenance. On the basis of realizing the configuration relationship check between the inverter and the battery cluster unit, it also realizes the inspection of battery cell failure, enriches the dimension of battery cell detection, improves inspection efficiency, and also improves the efficiency of manual maintenance.

[0108] Based on the energy storage system provided in the above embodiment, in a possible implementation, the controller 21 in the energy storage system can determine different fault types according to different preset conditions, so that when indicating that the battery cell is an abnormal battery cell, the fault type of the abnormal battery cell can be further indicated.

[0109] In one implementation, whether it is the first fault type can be determined based on the voltage on the DC side of the inverter. Specifically, when there is no voltage on the DC side of the inverter, it is determined to be the first fault type. Of course, in one implementation, the first fault type can also be determined based on the operating state of the battery cluster unit. Specifically, when the battery cluster unit is in a non-operating state, it is determined to be the first fault type. The first fault type indicates an abnormality caused by all hardware wiring errors or all software configuration errors between the inverter and the battery cluster unit.

[0110] In one implementation, whether it is the second fault type can be determined based on the response of the inverter. Specifically, when the inverter does not respond to the power-on instruction, it is determined to be the second fault type. The second fault type represents an abnormality caused by an inverter fault.

[0111] In one implementation, whether it is the third fault type can be determined based on the response of the contactor corresponding to the battery cluster unit. Specifically, when the contactor corresponding to the battery cluster unit does not respond to the power-on instruction, it is determined to be the third fault type. The third fault type indicates an abnormality caused by a fault in the contactor corresponding to the battery cluster unit.

[0112] In one implementation, it can be determined whether it is the fourth fault type based on the change in power of the battery cluster unit. Specifically, the fourth fault type indicates that when the inverter is charged or discharged according to the target power, if the change in power of the battery cluster unit exceeds the preset power range, it is determined to be the fourth fault type. Of course, in one implementation, it can also be determined whether it is the fourth fault type based on the DC side voltage of an inverter (such as the second inverter) other than the current inverter (such as the first inverter). Specifically, when there is an inverter with a non-zero DC side voltage in addition to the current inverter, it is determined to be the fourth fault type. Among them, the fourth fault type is characterized by an abnormality caused by a partial hardware wiring error or a partial software configuration error between the inverter and the battery cluster unit.

[0113] In one implementation, whether it is the fifth fault type can be determined based on the voltage at the output end of the battery cluster unit. Specifically, when there is no voltage at the output end of the battery cluster unit, it is determined to be the fifth fault type. The fifth fault type indicates an abnormality caused by a battery cluster unit failure.

[0114] It should be noted that before the above-mentioned judgments based on the various fault types are made, the energy storage system is shut down, and the current battery unit (such as the first battery unit) is turned on.

[0115] Based on the energy storage system provided in the above embodiment, see Figure 3 , which is a flow chart of a control method for an energy storage system provided in an embodiment of the present application.

[0116] The energy storage system provided in the embodiment of the present application is the energy storage system described in any of the above embodiments, combined with Figure 3 As shown, the control method of the energy storage system provided in the embodiment of the present application may include:

[0117] S301: When the energy storage system is shut down and a first battery unit among the m battery units is not powered on, control a first inverter in the first battery unit and a corresponding first battery cluster unit to power on.

[0118] S302: If there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state, determine that the first battery unit is an abnormal battery unit.

[0119] S303: If there is voltage on the DC side of the first inverter and the first battery cluster unit is in operation, determine that the first battery unit is a normal battery unit.

[0120] The non-abnormal battery cell refers to a battery cell in which the DC side of the inverter has voltage and the battery cluster unit is in an operating state.

[0121] In one implementation, the method further includes: when the energy storage system is shut down and the first battery unit is turned on, controlling the first inverter of the first battery unit to charge or discharge according to the target power, and judging whether the first battery unit is an abnormal battery unit according to the target power and the changed power of the first battery cluster unit.

[0122] In one implementation, the method further includes: if the changed power exceeds a preset power range, determining that the first battery cell is an abnormal battery cell; the preset power range is obtained based on the target power.

[0123] In one implementation, the method also includes: when the energy storage system is shut down and the first battery unit is turned on, determining whether the DC side voltage of the second inverter of the second battery unit among the m battery units is zero; if there is a second battery unit whose DC side voltage is not zero, determining that the first battery unit is an abnormal battery unit; wherein the second battery unit is a battery unit other than the first battery unit among the m battery units.

[0124] In one implementation, the method further includes: when the energy storage system is shut down and the first battery unit is turned on, if the DC side voltage of the first inverter of the first battery unit is less than a preset voltage, determining that the first battery unit is an abnormal battery unit.

[0125] In one implementation, before controlling the first inverter to charge or discharge according to the target power, the method further includes: obtaining the remaining power of the first battery cluster unit, and if the remaining power is greater than the preset power, sending a discharge instruction to the first inverter, the discharge instruction indicating that the target power is the first power; if the remaining power is less than or equal to the preset power, sending a charge instruction to the first inverter, the charge instruction indicating that the target power is the second power;

[0126] The controlling the first inverter of the first battery unit to charge or discharge according to the target power includes: controlling the first inverter to discharge according to the first power according to the discharge instruction, or controlling the first inverter to charge according to the second power according to the charge instruction.

[0127] In one implementation, the method further includes: if the first inverter is not powered on or the contactor of the first battery cluster unit is not closed, determining that the first battery unit is an abnormal battery unit.

[0128] In one implementation, the method further includes: after determining the abnormal battery cell, acquiring and sending a serial number corresponding to the abnormal battery cell.

[0129] The control method of the energy storage system provided in the embodiment of the present application has the same beneficial effects as the energy storage system provided in the above embodiment, so it will not be described in detail.

[0130] See also Figure 4 , which is a schematic diagram of a control process of an energy storage system provided in an embodiment of the present application. Figure 4 As shown, the control process of the energy storage system provided in the embodiment of the present application can be:

[0131] Step 1: Issue a system self-check instruction; if the energy storage system is in a shutdown state, execute step 2; if the energy storage system is in a non-shutdown state, end the process.

[0132] The self-check instruction means an instruction for checking the battery unit. The non-shutdown state means that the energy storage system is in a state other than the shutdown state, such as a working state, a dormant state, and the like.

[0133] Step 2: Determine whether there is a fault in the battery unit in the energy storage system. If there is a fault, check the next battery unit. If there is no fault, execute step 3.

[0134] Step 3: Send a start-up command to the inverter and send a contactor closing command to the corresponding battery cluster unit.

[0135] The battery unit without fault means the battery unit characterized as without fault after the last detection. The startup command means the command for controlling the startup of the inverter, and the contactor closing command means the command for controlling the closing of the contactor of the battery cluster unit.

[0136] It should be understood that in the embodiment of the present application, the battery cells may be detected in sequence according to their corresponding numbers, or one battery cell may be arbitrarily selected from a plurality of battery cells for detection, and the detection order of the battery cells is not limited herein.

[0137] Step 4: When the inverter switches to the operating state, if the battery cluster unit corresponding to the inverter is in the non-operating state or there is no voltage on the DC side of the inverter, the battery unit corresponding to the inverter is determined to be an abnormal battery unit, and the next inverter executes step 2; otherwise, execute step 5.

[0138] As an example, assuming that the inverter 1 switches to the operating state, if the battery cluster unit 1 corresponding to the inverter 1 is in the non-operating state or there is no voltage on the DC side of the inverter 1, it is determined that the battery unit 1 corresponding to the inverter 1 is an abnormal battery unit.

[0139] Step 5: Determine whether the SOC of the battery cluster unit is greater than a preset value, and if so, issue a discharge command; if not, issue a charge command.

[0140] The target power of the inverter can be determined according to the SOC of the battery cluster unit corresponding to the inverter. When the SOC is greater than or equal to 50%, a discharge power of 5% (settable) of the rated value of the inverter (referred to as P2) is sent, and when the SOC is less than 50%, a charging power of 5% of the rated value of the inverter (referred to as P2) is sent.

[0141] Step 6: Continuously collect the output power of the battery cluster unit for 5 seconds and determine whether the output power is consistent with the target power; if consistent, the next inverter is made to execute step 2; if inconsistent, the battery unit corresponding to the inverter is determined to be an abnormal battery unit.

[0142] As an example, check whether the product of the voltage and current of the battery cluster unit corresponding to the inverter (referred to as P1) is consistent with the target power (P2) issued by the inverter. Generally, the fluctuating power P3 = P2*10%, and the preset power range is |P2|-|P3|<|P1|<|P2|+|P3|. If P1 is within this range, the power is considered consistent, otherwise it is inconsistent.

[0143] Step 7: After all battery cells have been checked, determine whether there is an abnormal battery cell. If so, send the number of the abnormal battery cell. If not, end the process.

[0144] Among them, according to the number of recorded abnormal battery cells, if the number of abnormal battery cells is greater than 0, a pop-up window will prompt the number of the abnormal battery cell; if the number of abnormal battery cells is 0, it will prompt that the wiring is normal.

[0145] Among them, during the execution of the above steps, the energy storage system is prohibited from straight-line startup operation.

[0146] Based on the control process of the energy storage system provided in the above embodiment, see Figure 5 , which is a schematic diagram of the control process of another energy storage system provided by an embodiment of the present application. If no abnormality is detected in the battery unit in the above embodiment, a further check is required to prevent partial hardware wiring errors or partial software configuration errors. Figure 5 As shown, the control process of the energy storage system further provided in the embodiment of the present application may be:

[0147] Step 1: Issue a system self-check instruction; if the energy storage system is in a shutdown state, execute step 2; if the energy storage system is in a non-shutdown state, end the process.

[0148] Step 2: Determine whether there is a fault in the battery cluster unit in the energy storage system. If there is a fault, check the next battery unit. If there is no fault, execute step 3.

[0149] Step 3: Send contactor closing instructions to the battery cluster units in sequence; if the contactor is not closed after 5 seconds or the contactor is faulty, the battery unit is determined to be an abnormal battery unit, and the next battery unit is controlled to execute step 2; if the contactor is normal, execute step 4.

[0150] In the embodiment of the present application, the contactor corresponding to the battery cluster unit may be checked, and the inverter may also be checked at the same time, which is not specifically limited here.

[0151] A battery cluster unit without a fault means a battery cluster unit that a previous inspection result indicates has no faults.

[0152] Step 4: Determine whether the DC side voltage of the inverter corresponding to the battery cluster unit is less than the preset voltage. If so, determine that the battery cell corresponding to the battery cluster unit is an abnormal battery cell; if not, disconnect the contactor and determine the next battery cell.

[0153] If the DC side voltage is greater than 10V, it is considered that there is a DC side voltage.

[0154] Step 5: After all battery cells have been checked, determine whether there is an abnormal battery cell. If so, send the number of the abnormal battery cell. If not, end the process.

[0155] Among them, it can be judged based on the number of recorded abnormal battery cells. If the number of abnormal battery cells is greater than 0, a pop-up window will prompt the cell number of the abnormal battery cell. If the number of abnormal battery cells is 0, it will prompt that the wiring is normal.

[0156] Among them, during the execution of the above steps, the energy storage system is prohibited from straight-line startup operation.

[0157] Based on the control method of the energy storage system provided in the above embodiment, in a possible implementation manner, see Figure 6 , which is a schematic diagram of a control device provided in an embodiment of the present application.

[0158] The control device may include a memory 611 and a processor 612. Figure 6 As shown, the memory may be a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM memory, an Electronic Programmable ROM (EPROM), a register, a hard disk, a removable disk, etc.

[0159] The memory 611 can store computer instructions. When the computer instructions stored in the memory 611 are executed by the processor 612, the processor 612 can be used to execute the control method of the energy storage system. The memory 611 can also store data, for example, information such as target power and variable power involved in the above embodiments.

[0160] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the process or function according to the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server, data center, etc. that includes one or more available media integrated. The available medium can be a magnetic medium, (e.g., a floppy disk, a hard disk, a tape), or a semiconductor medium (e.g., a solid state drive (solid statedisk, SSD)), etc.

[0161] The present application also provides a readable storage medium for storing the method provided in the above embodiment, for example, a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM memory, an electronic programmable ROM (EPROM), a register, a hard disk, a removable disk or any other form of storage medium in the art.

[0162] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. For the method disclosed in the embodiment, since it corresponds to the product embodiment disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the product embodiment part.

[0163] The "first" and "second" in the names such as "first" and "second" (if any) mentioned in the embodiments of the present application are only used as name identifiers and do not represent the first or second in order.

[0164] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An energy storage system, characterized in that: include: A controller and m inverters, each of the inverters is connected to a corresponding battery cluster unit, the battery cluster unit includes a plurality of battery clusters, each of the inverters and the corresponding battery cluster unit constitute a battery unit, and m is an integer greater than or equal to 2; The controller is used for controlling the first inverter in the first battery cell and the corresponding first battery cluster unit to start up when the energy storage system is shut down and the first battery cell among the m battery cells is not started up, and if there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state, determining that the first battery cell is an abnormal battery cell.

2. The system according to claim 1, characterized in that The controller is further used to control the first inverter of the first battery unit to charge or discharge according to the target power when the energy storage system is shut down and the first battery unit is turned on, and to determine whether the first battery unit is an abnormal battery unit according to the target power and the changed power of the first battery cluster unit.

3. The system according to claim 2, characterized in that The controller is used to determine that the first battery cell is an abnormal battery cell if the changed power exceeds a preset power range; the preset power range is obtained based on the target power.

4. The system according to claim 1, characterized in that The controller is further configured to, when the energy storage system is shut down and the first battery unit is turned on, determine that the first battery unit is an abnormal battery unit if there is a second battery unit whose DC side voltage is not zero among the m battery units.

5. The system according to claim 1, characterized in that The controller is further configured to determine that the first battery unit is an abnormal battery unit if a DC side voltage of the first inverter of the first battery unit is less than a preset voltage when the energy storage system is shut down and the first battery unit is turned on.

6. The system according to claim 2, characterized in that The controller is further configured to: before controlling the first inverter to charge or discharge according to the target power, obtain the remaining power of the first battery cluster unit, and if the remaining power is greater than a preset power, send a discharge instruction to the first inverter, wherein the discharge instruction indicates that the target power is a first power; if the remaining power is less than or equal to the preset power, send a charge instruction to the first inverter, wherein the charge instruction indicates that the target power is a second power; The controller is used to control the first inverter to discharge according to the first power according to the discharge instruction, or to control the first inverter to charge according to the second power according to the charge instruction.

7. The system according to claim 1, characterized in that The controller is further used to determine that the first battery cell is an abnormal battery cell if the first inverter does not respond or the contactor of the first battery cluster unit does not respond after controlling the first inverter in the first battery cell and the corresponding first battery cluster unit to start up.

8. The system according to any one of claims 1 to 7, characterized in that: The controller is further configured to send a serial number corresponding to the abnormal battery cell after determining the abnormal battery cell.

9. A control method for an energy storage system, characterized in that: The energy storage system comprises: a controller and m inverters, each of the inverters is connected to a corresponding battery cluster unit, the battery cluster unit comprises a plurality of battery clusters, each of the inverters and the corresponding battery cluster unit constitute a battery unit, and m is an integer greater than or equal to 2; The control method comprises: When the energy storage system is shut down and a first battery unit among the m battery units is not powered on, controlling a first inverter in the first battery unit and a corresponding first battery cluster unit to power on; If there is no voltage on the DC side of the first inverter or the first battery cluster unit is in a non-operating state, it is determined that the first battery unit is an abnormal battery unit.

10. The control method according to claim 9, characterized in that: The method further comprises: When the energy storage system is shut down and the first battery unit is turned on, controlling the first inverter to charge or discharge according to a target power; Whether the first battery cell is an abnormal battery cell is determined according to the target power and the changed power of the first battery cluster cell corresponding to the first inverter.

11. A control device, characterized in that: It includes a processor and a memory, the processor is connected to the memory, the memory is used to store programs, instructions or codes, and the processor is used to execute the programs, instructions or codes in the memory to complete the control method of the energy storage system as described in any one of claims 9-10.

12. A computer-readable storage medium, characterized in that: A computer program is stored, and the computer program is loaded by a processor to execute the control method of the energy storage system according to any one of claims 9 to 10.

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