Method and device for adjusting input state, storage medium and electronic device

Abstract

The invention discloses an input state adjusting method and device, a storage medium and an electronic device, and the method comprises the steps: obtaining real-time data corresponding to each battery unit in an energy storage system, the energy storage system comprises a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data at least comprises the voltage corresponding to each battery cluster and the charge state corresponding to each battery cluster; determining the working state of each battery cluster according to the real-time data, and generating a target pulse signal corresponding to the working state; and adjusting the input state of each battery cluster during the operation of the energy storage system by using the target pulse signal. By adopting the technical scheme, the problems of low battery utilization rate, high misoperation risk and high cost of the energy storage system in the related technology are solved. And the battery utilization rate in the energy storage system is improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage devices, and in particular to a method and device for adjusting an input state, a storage medium, and an electronic device. Background Art

[0002] In recent years, energy storage technology, especially battery energy storage, has played an increasingly important role in improving the flexibility and stability of power systems. As an advanced energy storage solution, the cascaded high-voltage direct-mounted energy storage system has been widely favored because it can be directly connected to the high-voltage grid without the need for additional boosting equipment, and its modular design facilitates expansion and maintenance. The system consists of several battery clusters and their corresponding power conversion units connected in series. Each power conversion unit is independently controlled to achieve efficient storage and release of energy.

[0003] However, battery energy storage systems face a key challenge in actual operation: the problem of battery consistency. Due to differences in manufacturing processes, environmental conditions, and aging, even batteries in the same energy storage system can have different performances, and these differences will gradually increase over time. This inconsistency causes some batteries to reach the charge and discharge thresholds faster than other batteries during the charge and discharge process of the energy storage system, i.e., overcharge or over-discharge. Overcharging or over-discharging will not only damage the battery and shorten its life, but may also cause the stability of the energy storage system to decrease, affecting its overall performance and economic benefits.

[0004] In order to solve the above problems, the current cascade type high voltage direct hanging energy storage system usually adopts two strategies to deal with overcharged or over-discharged batteries. The first method is to limit the energy storage system to perform the opposite operation when overcharge or over-discharge is detected (for example, only discharge is allowed when overcharged, and only charging is allowed when over-discharged). Although this method is simple, it will lead to a significant reduction in battery utilization, especially in long-term energy storage applications, the economy and reliability of the system will be greatly reduced.

[0005] The second method is to add a bypass contactor to each power conversion unit. When the battery is overcharged or over-discharged, the bypass contactor automatically cuts off the connection between the battery and the system to ensure the normal operation of other parts of the system. However, this strategy has several major disadvantages: First, adding a bypass contactor will significantly increase the system cost, especially for large energy storage systems, the additional cost cannot be ignored; second, the working environment of the energy storage system is complex, and the bypass contactor may malfunction due to electromagnetic interference, causing a short circuit inside the power conversion unit, posing a safety hazard; third, once the contactor is closed, it usually cannot be automatically separated due to design reasons, which means that when the system state switches from charging to discharging, or vice versa, the overcharged or over-discharged battery cannot be put back into operation, further reducing the battery utilization; finally, manually operating the bypass contactor increases maintenance costs and complexity.

[0006] With regard to the problems in related technologies of low battery utilization rate, high risk of malfunction and high cost of energy storage systems, no effective solution has been proposed so far.

[0007] Therefore, it is necessary to improve the related technology to overcome the above-mentioned defects in the related technology. Summary of the invention

[0008] The embodiments of the present application provide a method and device for adjusting the input state, a storage medium and an electronic device to at least solve the problems of low battery utilization, high risk of malfunction and high cost of the energy storage system.

[0009] According to one aspect of an embodiment of the present application, a method for adjusting a startup state is provided, comprising: obtaining real-time data corresponding to each battery unit in an energy storage system, wherein the energy storage system comprises a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data comprises at least: a voltage corresponding to each battery cluster, and a state of charge corresponding to each battery cluster; determining a working state of each battery cluster according to the real-time data, and generating a target pulse signal corresponding to the working state; and using the target pulse signal to adjust the startup state of each battery cluster when the energy storage system is running.

[0010] In an exemplary embodiment, after using the target pulse signal to adjust the input status of each battery cluster during the operation of the energy storage system, the method further includes: counting the real-time input status of different battery clusters in the energy storage system at the same time; determining a first number of power conversion units in bypass operation in the energy storage system according to the real-time input status, and determining a second number of power conversion units in non-bypass operation in the energy storage system; and determining whether to perform switching or shutdown processing on the energy storage system based on the first number and the second number.

[0011] In an exemplary embodiment, determining whether to perform switching or shutdown processing on the energy storage system is based on a first number and a second number, including: when the first number is greater than the second number, determining to perform switching or shutdown processing on the energy storage system; when the first number is less than or equal to the second number, determining not to perform switching or shutdown processing on the energy storage system.

[0012] In an exemplary embodiment, after determining that no switching or shutdown processing is performed on the energy storage system, the method further includes: switching the non-bypass working power conversion unit to a zero-level state; controlling the power conversion unit in the zero-level state to generate a drive pulse signal, wherein the drive pulse signal is used to release the blocking management of the switch tube in the power conversion unit.

[0013] In an exemplary embodiment, after using the target pulse signal to adjust the input status of each battery cluster when the energy storage system is running, the method further includes: continuously monitoring the input voltage of each battery cluster; when it is determined that the energy storage system executes a charging instruction, blocking management is performed on the switch tubes in the power conversion units corresponding to the battery clusters whose input voltage is greater than a first preset voltage threshold, wherein the switch tubes are used to control the generation of the target pulse signal; when it is determined that the energy storage system executes a discharging instruction, blocking management is performed on the switch tubes in the power conversion units corresponding to the battery clusters whose input voltage is less than a second preset voltage threshold.

[0014] In an exemplary embodiment, after using the target pulse signal to adjust the input state of each battery cluster during the operation of the energy storage system, the method further includes: recording the latest working state of different battery clusters after adjusting the input state to obtain target state information; calculating the target number of remaining available power conversion units in the energy storage system corresponding to the target state information; adjusting the phase of the modulation waveform and the basic carrier based on the target number to obtain the target carrier; and generating a new target pulse signal according to the target carrier.

[0015] According to another aspect of an embodiment of the present application, a device for adjusting the input status is also provided, including: an acquisition module, used to acquire real-time data corresponding to each battery unit in an energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: a voltage corresponding to each battery cluster, and a state of charge corresponding to each battery cluster; a generation module, used to determine the working status of each battery cluster according to the real-time data, and generate a target pulse signal corresponding to the working status; an adjustment module, used to use the target pulse signal to adjust the input status of each battery cluster when the energy storage system is running.

[0016] According to another aspect of the embodiments of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the above-mentioned input status adjustment method when running.

[0017] According to another aspect of an embodiment of the present application, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the input status adjustment method through the computer program.

[0018] According to another aspect of the embodiments of the present application, a computer program product is provided, including a computer program, and the method for adjusting the input state when the computer program is executed by a processor.

[0019] Through this application, real-time data corresponding to each battery cell in the energy storage system is obtained, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: the voltage corresponding to each battery cluster, the state of charge corresponding to each battery cluster; the working state of each battery cluster is determined according to the real-time data, and a target pulse signal corresponding to the working state is generated; and the target pulse signal is used to adjust the input state of each battery cluster when the energy storage system is running. The above technical scheme solves the problems of low battery utilization rate, high risk of malfunction and high cost in the energy storage system in the related technology. By real-time monitoring of the state of the battery cluster and dynamically adjusting its input state in the energy storage system, the operating efficiency and safety of the energy storage system are effectively improved. The scheme can adaptively adjust the pulse signal according to the voltage and state of charge of the battery cluster, thereby realizing the refined management of the battery cluster and avoiding the degradation of system performance and safety hazards caused by different states of battery cells. In practical applications, this method can significantly improve the energy utilization rate of the energy storage system, extend battery life, reduce maintenance costs, and provide strong technical support for large-scale energy storage applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 It is a hardware structure block diagram of a computer terminal of an input state adjustment method of an embodiment of the present application;

[0023] Figure 2 is a flow chart of a method for adjusting an input state according to an embodiment of the present application;

[0024] Figure 3 It is a basic topology diagram of a cascade type high voltage direct-mounted energy storage system according to an embodiment of the present application;

[0025] Figure 4 It is a strategy flow chart for improving battery utilization of a cascade type high voltage direct-mounted energy storage system according to an embodiment of the present application;

[0026] Figure 5 is a flow chart of a driving pulse generation principle of a power conversion unit according to an embodiment of the present application;

[0027] Figure 6 is a topological schematic diagram of a power conversion unit according to an embodiment of the present application;

[0028] Figure 7 It is a structural block diagram of an input state adjustment according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] 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 should fall within the scope of protection of the present application.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] The method embodiments provided in the embodiments of the present application can be executed in a computer terminal, a mobile terminal or a similar computing device. Taking running on a computer terminal as an example, Figure 1 1 is a hardware structure block diagram of a computer terminal of an input state adjustment method of an embodiment of the present application. Figure 1 As shown, the computer terminal may include one or more ( Figure 1 The computer terminal includes a processor 102 (only one is shown in the figure) (the processor 102 may include but is not limited to a processing device such as a microprocessor (Central Processing Unit, CPU) or a programmable logic device (Field Programmable Gate Array, FPGA)) and a memory 104 for storing data, wherein the computer terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1The structure shown is only for illustration and does not limit the structure of the above-mentioned computer terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0032] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for adjusting the input state in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the computer terminal via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0033] The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of a computer terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0034] In this embodiment, a method for adjusting the input state is provided. Figure 2 is a flow chart of a method for adjusting an input state according to an embodiment of the present application, such as Figure 2 As shown, the process includes the following steps S202-S206:

[0035] Step S202: acquiring real-time data corresponding to each battery unit in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: a voltage corresponding to each battery cluster and a state of charge corresponding to each battery cluster;

[0036] Step S204: determining the working state of each battery cluster according to the real-time data, and generating a target pulse signal corresponding to the working state;

[0037] Step S206: using the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running.

[0038] In the above steps, real-time data corresponding to each battery cell in the energy storage system is obtained, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: the voltage corresponding to each battery cluster, and the state of charge corresponding to each battery cluster; the working state of each battery cluster is determined according to the real-time data, and a target pulse signal corresponding to the working state is generated; and the target pulse signal is used to adjust the input state of each battery cluster when the energy storage system is running. The above technical scheme solves the problems of low battery utilization rate, high risk of malfunction and high cost in the energy storage system in the related technology. By real-time monitoring of the state of the battery cluster and dynamically adjusting its input state in the energy storage system, the operating efficiency and safety of the energy storage system are effectively improved. The scheme can adaptively adjust the pulse signal according to the voltage and state of charge of the battery cluster, thereby realizing the refined management of the battery cluster and avoiding the degradation of system performance and safety hazards caused by different states of battery cells. In practical applications, this method can significantly improve the energy utilization rate of the energy storage system, extend battery life, reduce maintenance costs, and provide strong technical support for large-scale energy storage applications.

[0039] In an exemplary embodiment, after using the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running, the above method also includes: counting the real-time input states of different battery clusters in the energy storage system at the same time; determining the first number of power conversion units in bypass operation in the energy storage system according to the real-time input state, and determining the second number of power conversion units in non-bypass operation in the energy storage system; determining whether to perform switching or shutdown processing on the energy storage system based on the first number and the second number. By counting and analyzing the real-time input state of the battery cluster, potential problems in the system can be discovered in time, such as overcharging or over-discharging of the battery cluster, so as to take corresponding management measures to ensure the stable operation of the energy storage system, which is particularly suitable for energy storage applications that require high reliability and long life, such as grid energy storage, data center backup power supply, etc.

[0040] Assume that a cascaded high-voltage direct-mounted energy storage system consists of 12 battery clusters, each cluster is equipped with a power conversion unit, and the maximum number of power conversion units that can be bypassed in the system design is 3. At a certain moment, the system monitoring shows that: battery cluster 1, battery cluster 2 and battery cluster 10 are bypassed due to overcharging; battery cluster 6 is also bypassed due to overdischarge; the remaining battery clusters (3, 4, 5, 7, 8, 9, 11 and 12) are in normal working condition. At this time, the first number corresponds to 4 (that is, the power conversion units corresponding to battery clusters 1, 2, 6 and 10). The second number corresponds to 8 (that is, the power conversion units corresponding to battery clusters 3, 4, 5, 7, 8, 9, 11 and 12). Further, according to the real-time input status, the system will automatically make the following judgments and adjustments: Check whether the first number (the number of bypassed power conversion units) exceeds the maximum bypass number allowed by the system design (3 in this case). If the first number exceeds the maximum allowable bypass number (i.e., the first number is 4, which exceeds 3), the system will enter the decision-making stage: determine the current power instruction. If it is a charging instruction, considering that battery clusters 1, 2, and 10 are overcharged and battery cluster 6 is over-discharged, the system may determine that the requirements for further charging cannot be met because the additional battery clusters may be overcharged. If it is a discharging instruction, since battery cluster 6 is over-discharged and battery clusters 1, 2, and 10 have been bypassed, the system may also determine that the requirements for further discharging cannot be met because the additional battery clusters may be over-discharged. If the number of overcharged battery clusters under the charging instruction exceeds the number that can be bypassed, the system will automatically switch to the discharge mode or shut down completely to prevent more battery clusters from being overcharged. Similarly, if the number of over-discharged battery clusters under the discharge instruction exceeds the number that can be bypassed, the system will automatically switch to the charging mode or shut down completely to prevent more battery clusters from being over-discharged.

[0041] In summary, by real-time counting of the number of power conversion units in bypass and non-bypass states, combined with the current power command of the system, the operation mode of the energy storage system is intelligently judged and adjusted, effectively avoiding system shutdown or performance degradation caused by excessive battery overcharge / over-discharge, while maximizing the battery utilization rate and ensuring the economy and reliability of the system.

[0042] In an exemplary embodiment, determining whether to perform switching or shutdown processing on the energy storage system based on the first number and the second number includes: when the first number is greater than the second number, determining to perform switching or shutdown processing on the energy storage system; when the first number is less than or equal to the second number, determining not to perform switching or shutdown processing on the energy storage system. The above strategy can effectively prevent too many power conversion units in the system from entering the bypass working state, avoiding a significant decline in system performance.

[0043] In an exemplary embodiment, after determining that the energy storage system will not be switched or shut down, the method further includes: switching the non-bypass power conversion unit to a zero-level state; controlling the power conversion unit in the zero-level state to generate a drive pulse signal, wherein the drive pulse signal is used to release the blocking management of the switch tube in the power conversion unit. In summary, by switching the power conversion unit to a zero-level state, unnecessary energy loss can be reduced and the energy efficiency of the system can be improved. At the same time, releasing the blocking management of the switch tube can ensure that the system can respond quickly when needed, which is suitable for scenarios that require efficient energy management and rapid response, such as smart grids, microgrids, etc.

[0044] In an exemplary embodiment, after using the target pulse signal to adjust the input status of each battery cluster when the energy storage system is running, the method further includes: continuously monitoring the input voltage of each battery cluster; when it is determined that the energy storage system executes a charging instruction, blocking management is performed on the switch tubes in the power conversion units corresponding to the battery clusters whose input voltage is greater than a first preset voltage threshold, wherein the switch tubes are used to control the generation of the target pulse signal; when it is determined that the energy storage system executes a discharging instruction, blocking management is performed on the switch tubes in the power conversion units corresponding to the battery clusters whose input voltage is less than a second preset voltage threshold.

[0045] In summary, the above-mentioned dynamic voltage monitoring and management mechanism can effectively prevent overcharging or over-discharging of battery clusters, protect battery cells, extend the service life of the energy storage system, and greatly improve the effect in scenarios that require refined management of battery status, such as home energy storage systems, commercial energy storage facilities, etc.

[0046] In an exemplary embodiment, after using the target pulse signal to adjust the input state of each battery cluster during the operation of the energy storage system, the method further includes: recording the latest working state of different battery clusters after adjusting the input state to obtain target state information; calculating the target number of remaining available power conversion units in the energy storage system corresponding to the target state information; adjusting the phase of the modulation waveform and the basic carrier based on the target number to obtain the target carrier; and generating a new target pulse signal according to the target carrier.

[0047] Assume that an energy storage system contains 16 battery clusters (16 power conversion units), and the system design allows a maximum of 4 power conversion units to be bypassed. In a certain operation, system monitoring shows that battery cluster 1 and battery cluster 4 are switched to zero-level state due to overcharging, and battery cluster 12 and battery cluster 15 are also switched to zero-level state due to overdischarge, that is, a total of 4 power conversion units are bypassed. After completing the above-mentioned power conversion unit input state adjustment, the system needs to record the latest working state, that is, which power conversion units have been bypassed and which are still operating normally. The target state information here includes: the power conversion units corresponding to battery clusters 1, 4, 12, and 15 are in bypass state. The power conversion units corresponding to the remaining battery clusters 2, 3, 5-11, 13, 14, and 16 are in normal working state. It should be noted that the target number refers to the number of power conversion units still available in the system. In this example, since the power conversion units corresponding to battery clusters 1, 4, 12, and 15 are bypassed, the target number is 16-4=12 power conversion units. Adjust the phase of the modulation waveform and the basic carrier to generate the target carrier. Specifically, the original modulation waveform and basic carrier phase of the system are based on the operation of all power conversion units (16). Now, since 4 power conversion units are bypassed, the system needs to adjust the modulation waveform and carrier phase to adapt to the operation of the remaining 12 power conversion units. The specific adjustment method is as follows: First, recalculate the amplitude of the modulation wave to match the number of remaining power conversion units. The amplitude of the modulation wave should be proportional to the target number to ensure that each normally operating power conversion unit can bear appropriate power and maintain the overall output power of the system unchanged. Then, adjust the phase of the basic carrier so that the phase difference between adjacent levels is suitable for the remaining 12 power conversion units. This adjustment is to optimize the power distribution between power conversion units to ensure that the system can operate efficiently even when some power conversion units are bypassed.

[0048] It is understandable that by recording and analyzing the latest working status of the battery cluster, the phase of the modulation waveform and the basic carrier can be dynamically adjusted to optimize the generation of the pulse signal, further improving the energy conversion efficiency of the energy storage system and the intelligence level of battery management, which is suitable for energy storage applications that require high adaptability and optimization, such as renewable energy power generation, electric vehicle charging stations, etc.

[0049] Obviously, the embodiments described above are only some embodiments of the present application, not all embodiments. In order to better understand the above method, the above process is described below in conjunction with the embodiments, but it is not intended to limit the technical solutions of the embodiments of the present application, specifically:

[0050] The optional embodiment of the present application provides a method for improving the battery utilization rate of a cascade type high voltage direct-mounted energy storage system, which can correctly cut out the battery when it is overcharged / over-discharged, and maintain the normal operation of the remaining batteries. Specifically, based on the relevant technology, the bypass contactor that is prone to malfunction is not used for bypass, but through control, the AC side of the power conversion unit to be bypassed is in a zero-level state, achieving an equivalent bypass, avoiding the risk of short circuit on the battery side, and allowing the remaining batteries that are still working to continue to operate; at the same time, the over-discharge unit is re-activated when the discharge instruction is given, and the over-charge unit is re-activated when the discharge instruction is given, further improving the battery utilization rate.

[0051] Optional, Figure 3 It is a basic topology diagram of a cascaded high-voltage direct-mounted energy storage system according to an embodiment of the present application; specifically, when the energy storage system detects that a battery cluster is overcharged / over-discharged, the energy storage system can automatically set the power conversion unit corresponding to the battery cluster to a zero-level state according to the actual working state, so that no current flows through the overcharged / over-discharged battery cluster, reaching a bypass state, and the remaining power conversion units output normally, thereby ensuring the normal operation of other battery clusters outside the battery cluster.

[0052] As an optional implementation, Figure 4 This is a strategy flow chart for improving the battery utilization rate of the cascade type high voltage direct-mounted energy storage system according to an embodiment of the present application. Specifically, the above strategy flow includes the following steps:

[0053] Step 1, determining the power command switching logic, including: when the system power command changes, if the active power is positive, it is discharging, and if the active power is negative, it is charging; under the charging command, if there is a power conversion unit that was bypassed due to over-discharge, the driving pulses of the switch tubes of all power conversion units are first blocked to avoid malfunction of the switch tubes, and the over-discharge units are put back into the working state, that is, they are counted as normal units; under the discharging command, if there is a power conversion unit that was bypassed due to over-charge, the driving pulses of the switch tubes of all power conversion units are first blocked, and the over-charge units are put back into the working state, that is, they are counted as normal units; in addition, the available number of stages of the remaining available power conversion units can be calculated, and the modulation wave obtained by the control loop can be divided by the available number of stages to obtain the modulation wave of each stage, and the basic carrier is phase-shifted based on the available number of stages, and the phase difference between adjacent stages is: Where S is the number of available levels. Optional, Figure 5 It is a flow chart of the principle of generating driving pulses of the power conversion unit according to the embodiment of the present application. Then, the driving pulse signal of the power conversion unit is regenerated after modulating each level of modulation wave and the phase-shifted carrier wave. The pulse blocking of all units is released.

[0054] Step 2, monitoring and processing battery overcharge / over-discharge, including: continuously monitoring the voltage of each battery, under the charging instruction, when the battery voltage is greater than the threshold, it is considered to be overcharged, then the drive pulses of the switch tubes of all power conversion units are first blocked to avoid malfunction of the switch tubes, and then the overcharge bypass level count is increased; under the discharging instruction, when the battery voltage is less than the threshold, it is considered to be over-discharged, then the drive pulses of the switch tubes of all power conversion units are first blocked to avoid malfunction of the switch tubes, and then the over-discharge bypass level count is increased.

[0055] Step three, determine the accumulated bypass number, and determine the zero-level pulse switching process based on the accumulated result. The accumulated bypass number includes: under the charging instruction, compare the overcharge bypass count with the bypassable count. If the overcharge bypass count is greater than the bypassable count, the system cannot continue to bypass. At this time, charging should be prohibited, and the power instruction should be switched to a discharge or shutdown instruction; under the discharge instruction, compare the over-discharge bypass count with the bypassable count. If the over-discharge bypass count is greater than the bypassable count, the system cannot continue to bypass. At this time, discharging should be prohibited, and the power instruction should be switched to a charge or shutdown instruction. Zero-level pulse switching includes: if the bypass level count is less than the bypassable level, the drive pulse of the newly added power conversion unit to be bypassed is set to VT1 and VT3 to be turned on, and VT2 and VT4 to be turned off, so that a zero-level bypass state is presented. Figure 6 : is a topological diagram of a power conversion unit according to an embodiment of the present application. ab = 0, the AC side is in a short-circuit state; while c and d are always disconnected, avoiding a short circuit on the battery side. Then the remaining drive pulses are regenerated according to the remaining available units. After the adjustment is completed, the pulse blockade is released and the operation continues, and the battery status continues to be monitored.

[0056] It should be noted that during the execution of the above optional implementation methods, the following aspects are mainly focused on:

[0057] The first aspect is the judgment of power unit input, that is, under the charging instruction, the power conversion unit that was bypassed due to over-discharge will be put into operation again; under the discharging instruction, the power conversion unit that was bypassed due to over-charge will be put into operation again. Before re-operation, the system will block the drive pulses of all power conversion units to avoid malfunction, and then generate new drive pulse signals.

[0058] The second aspect: battery status monitoring and processing; during charging, when the battery voltage or battery SOC exceeds the threshold, the battery is considered to be overcharged; during discharging, when the battery voltage or battery SOC is lower than the threshold, the battery is considered to be over-discharged. In case of overcharge / over-discharge, the system will block the drive pulses of all power conversion units to avoid malfunction, and then increase the bypass count. Compare the overcharge / over-discharge bypass count with the bypassable count. If the bypass count exceeds the bypassable count, stop charging / discharging and wait for the power command to switch or shut down. When the bypass count does not exceed the bypassable count, switch the power conversion unit to be bypassed to the zero level state, regenerate the drive pulse signal, and unblock it to continue running.

[0059] The third aspect: the zero-level state is achieved by setting the power conversion unit to be bypassed so that VT1 and VT3 are turned on and VT2 and VT4 are turned off, so that the AC side is in a zero-level state to prevent current from flowing through the overcharged / over-discharged battery.

[0060] The fourth aspect: generating driving pulse signals; calculating the number of remaining available power conversion units, adjusting the phase of the modulation waveform and the basic carrier wave, modulating each level of the modulation wave and the phase-shifted carrier wave, and generating a new driving pulse signal. When the number of levels decreases, in order to maintain the original power, the modulation index needs to be increased, but it must not exceed the upper limit to avoid over-modulation.

[0061] In summary, the optional embodiment of the present application proposes a method for improving the battery utilization rate of a cascade-type high-voltage direct-mounted energy storage system. The cascade-type high-voltage direct-mounted energy storage system consists of multiple power conversion units connected in series, and each power conversion unit corresponds to a battery cluster. When the system detects that a battery cluster is overcharged or over-discharged, the corresponding power conversion unit will be switched to a zero-level state to achieve a bypass effect, preventing the battery cluster from continuing to work, while the remaining power conversion units at the same level can still work normally, thereby improving the battery utilization rate.

[0062] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods of each embodiment of the present application.

[0063] In the present embodiment, a device for adjusting the input state is also provided, which is used to implement the above-mentioned embodiments and preferred embodiments, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the equipment described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware is also possible and conceived.

[0064] Figure 7 : is a structural block diagram of an input state adjustment device according to an embodiment of the present application, the device comprising:

[0065] The acquisition module 72 is used to acquire real-time data corresponding to each battery unit in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data at least includes: a voltage corresponding to each battery cluster and a state of charge corresponding to each battery cluster;

[0066] A generating module 74, configured to determine the working state of each battery cluster according to the real-time data, and to generate a target pulse signal corresponding to the working state;

[0067] The adjustment module 76 is used to use the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running.

[0068] The above device obtains real-time data corresponding to each battery cell in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data at least includes: the voltage corresponding to each battery cluster, and the state of charge corresponding to each battery cluster; the working state of each battery cluster is determined according to the real-time data, and a target pulse signal corresponding to the working state is generated; and the target pulse signal is used to adjust the input state of each battery cluster when the energy storage system is running. The above technical scheme solves the problems of low battery utilization rate, high risk of malfunction and high cost in the energy storage system in the related technology. By real-time monitoring of the state of the battery cluster and dynamically adjusting its input state in the energy storage system, the operating efficiency and safety of the energy storage system are effectively improved. The scheme can adaptively adjust the pulse signal according to the voltage and state of charge of the battery cluster, thereby realizing the refined management of the battery cluster and avoiding the degradation of system performance and safety hazards caused by different states of battery cells. In practical applications, this method can significantly improve the energy utilization rate of the energy storage system, extend battery life, reduce maintenance costs, and provide strong technical support for large-scale energy storage applications.

[0069] In an exemplary embodiment, the above-mentioned device also includes: a determination module, which is used to count the real-time input status of different battery clusters in the energy storage system at the same time after using the target pulse signal to adjust the input status of each battery cluster when the energy storage system is running; determine the first number of power conversion units in bypass operation in the energy storage system according to the real-time input status, and determine the second number of power conversion units in non-bypass operation in the energy storage system; determine whether to perform switching or shutdown processing on the energy storage system based on the first number and the second number.

[0070] In an exemplary embodiment, the above-mentioned determination module is also used to determine whether to perform switching or shutdown processing on the energy storage system when the first number is greater than the second number; when the first number is less than or equal to the second number, determine not to perform switching or shutdown processing on the energy storage system.

[0071] In an exemplary embodiment, the above-mentioned determination module also includes: a generation unit, which is used to determine that after no switching or shutdown processing is performed on the energy storage system, the non-bypass power conversion unit is switched to a zero-level state; and control the power conversion unit in the zero-level state to generate a drive pulse signal, wherein the drive pulse signal is used to release the blocking management of the switch tube in the power conversion unit.

[0072] In an exemplary embodiment, the above-mentioned device also includes: a management module, which is used to continuously monitor the input voltage of each battery cluster after using the target pulse signal to adjust the input status of each battery cluster when the energy storage system is running; when it is determined that the energy storage system executes a charging instruction, the switch tube in the power conversion unit corresponding to the battery cluster whose input voltage is greater than the first preset voltage threshold is blocked and managed, wherein the switch tube is used to control the generation of the target pulse signal; when it is determined that the energy storage system executes a discharging instruction, the switch tube in the power conversion unit corresponding to the battery cluster whose input voltage is less than the second preset voltage threshold is blocked and managed.

[0073] In an exemplary embodiment, the above-mentioned device also includes: a pulse module, which is used to record the latest working status of different battery clusters after adjusting the input status when the energy storage system is running, and obtain target status information after using the target pulse signal to adjust the input status of each battery cluster during operation of the energy storage system; calculate the target number of remaining available power conversion units in the energy storage system corresponding to the target status information; adjust the phase of the modulation waveform and the basic carrier based on the target number to obtain the target carrier; and generate a new target pulse signal according to the target carrier.

[0074] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0075] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0076] S1. Acquire real-time data corresponding to each battery unit in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: a voltage corresponding to each battery cluster and a state of charge corresponding to each battery cluster;

[0077] S2. determining the working state of each battery cluster according to the real-time data, and generating a target pulse signal corresponding to the working state;

[0078] S3. Using the target pulse signal, adjust the input state of each battery cluster when the energy storage system is running.

[0079] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0080] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0081] An embodiment of the present application further provides a computer program product, including a computer program, and when the computer program is executed by a processor, the steps in any one of the above method embodiments are performed.

[0082] An embodiment of the present application further provides another computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0083] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0084] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0085] S1. Acquire real-time data corresponding to each battery unit in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: a voltage corresponding to each battery cluster and a state of charge corresponding to each battery cluster;

[0086] S2. determining the working state of each battery cluster according to the real-time data, and generating a target pulse signal corresponding to the working state;

[0087] S3. Using the target pulse signal, adjust the input state of each battery cluster when the energy storage system is running.

[0088] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0089] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0090] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0091] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for adjusting an input state, characterized in that: include: Acquire real-time data corresponding to each battery unit in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: a voltage corresponding to each battery cluster and a state of charge corresponding to each battery cluster; Determine the working state of each battery cluster according to the real-time data, and generate a target pulse signal corresponding to the working state; The target pulse signal is used to adjust the input state of each battery cluster when the energy storage system is running.

2. The method according to claim 1, characterized in that After using the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running, the method further includes: Counting the real-time input status of different battery clusters in the energy storage system at the same time; Determine a first number of power conversion units in bypass operation in the energy storage system according to the real-time input state, and determine a second number of power conversion units in non-bypass operation in the energy storage system; Whether to perform switching or shutdown processing on the energy storage system is determined based on the first number and the second number.

3. The method according to claim 2, characterized in that Determining whether to perform switching or shutdown processing on the energy storage system based on the first number and the second number includes: When the first number is greater than the second number, determining to perform switching or shutdown processing on the energy storage system; When the first number is less than or equal to the second number, it is determined that no switching or shutdown processing is performed on the energy storage system.

4. The method according to claim 2, characterized in that: After determining that the energy storage system is not to be switched or shut down, the method further includes: Switching the non-bypass power conversion unit to a zero-level state; A power conversion unit in a zero-level state is controlled to generate a driving pulse signal, wherein the driving pulse signal is used to release the blocking management of the switch tube in the power conversion unit.

5. The method according to claim 1, characterized in that After using the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running, the method further includes: Continuously monitor the input voltage of each battery cluster; When it is determined that the energy storage system executes a charging instruction, blocking management is performed on the switch tube in the power conversion unit corresponding to the battery cluster whose input voltage is greater than the first preset voltage threshold, wherein the switch tube is used to control the generation of the target pulse signal; When it is determined that the energy storage system executes the discharge instruction, the switch tubes in the power conversion units corresponding to the battery cluster whose input voltage is less than the second preset voltage threshold are locked and managed.

6. The method according to claim 1, characterized in that After using the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running, the method further includes: Record the latest working status of different battery clusters after adjusting the input status to obtain target status information; calculate the target number of remaining available power conversion units in the energy storage system corresponding to the target status information; Adjusting the phase of the modulation waveform and the base carrier based on the target quantity to obtain a target carrier; A new target pulse signal is generated according to the target carrier.

7. A device for adjusting the input state, characterized in that: include: An acquisition module is used to acquire real-time data corresponding to each battery unit in the energy storage system, wherein the energy storage system includes a plurality of power conversion units connected in series, and each power conversion unit corresponds to a battery cluster; the real-time data includes at least: a voltage corresponding to each battery cluster and a state of charge corresponding to each battery cluster; A generating module, used to determine the working state of each battery cluster according to the real-time data, and generate a target pulse signal corresponding to the working state; The adjustment module is used to use the target pulse signal to adjust the input state of each battery cluster when the energy storage system is running.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method according to any one of claims 1 to 6 when executed.

9. An electronic device comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 6 through the computer program.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

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