SOC imbalance adjustment method and device, storage medium, electronic device, and computer program product

Abstract

The present application discloses a method and device for adjusting #imgabs0# imbalance, a storage medium, an electronic device, and a computer program product, relating to the field of batteries. The method for adjusting #imgabs1# imbalance is applied to a high-voltage cascade energy storage system, comprising: sampling the battery charge state of a three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result; determining the intra-phase #imgabs2# imbalance of the three-phase battery cluster based on the sampling result to obtain a first imbalance; and determining the inter-phase #imgabs3# imbalance of the three-phase battery cluster based on the sampling result to obtain a second imbalance; determining an output fundamental voltage based on the first imbalance, and superimposing the output fundamental voltage on #imgabs4# cells of the three-phase battery cluster to adjust the intra-phase #imgabs5# imbalance; and determining a zero-sequence voltage based on the second imbalance, and adjusting the inter-phase #imgabs6# imbalance based on the zero-sequence voltage.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a Method and device for adjusting imbalance, storage medium, electronic device, and computer program product. Background Art

[0002] In a high-voltage cascade energy storage system, battery clusters are connected in series. The bridge power unit realizes large capacity and high flexibility power conversion. ) is an important factor in ensuring the overall system performance and battery life. Balancing algorithms include fundamental voltage injection and zero-sequence voltage injection, which are used for intra-phase and inter-phase respectively. Balanced, but their balanced power adjustment capabilities are limited and cannot effectively cope with the system operation Dynamic changes in imbalance and fluctuations in phase current amplitude.

[0003] Specifically, the balancing current of the fundamental voltage injection method is The imbalance degree, balance adjustment coefficient and phase current amplitude are linearly related. When the imbalance degree decreases or the phase current amplitude decreases, the balancing current also decreases, resulting in a slower balancing rate. The zero-sequence voltage injection method also faces Balancing current with phase The problem of reducing the imbalance degree and the phase current amplitude is reduced, which limits the improvement of the balancing speed and cannot meet the requirements of the high-voltage cascade energy storage system under variable working conditions. Balance demand.

[0004] Regarding related technologies, traditional regulation There is no effective solution to the problem of low flexibility of the imbalance method.

[0005] Therefore, it is necessary to improve the related technology to overcome the above-mentioned defects in the related technology. Summary of the Invention

[0006] The embodiment of the present application provides a Imbalance adjustment method and device, storage medium, electronic device, computer program product, to at least solve the problem of traditional adjustment The problem of low flexibility of the imbalance method.

[0007] According to one aspect of the embodiment of the present application, there is provided a The method for adjusting the imbalance degree is applied to a high-voltage cascade energy storage system, comprising: sampling the battery charge state of a three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result; determining the phase internal state of the three-phase battery cluster according to the sampling result; Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. Unbalance, obtain a second imbalance; determine the output fundamental voltage according to the first imbalance, and The output fundamental voltage is superimposed by each unit to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance.

[0008] In an exemplary embodiment, the method of determining the output fundamental voltage according to the first imbalance degree includes: obtaining the angular frequency of the fundamental voltage of the high-voltage cascade energy storage system and the phase of the first grid-side current of the high-voltage cascade energy storage system; determining the initial output fundamental voltage according to the following formula: , and according to the initial output fundamental voltage Determine the output fundamental voltage: ;in, is the first imbalance, is the angular frequency of the fundamental voltage, is the phase of the first grid-side current, is the gain coefficient, which is the effective value of the current of the grid-side AC power of the high-voltage cascade energy storage system. and the first preset coefficient Determined coefficient.

[0009] In an exemplary embodiment, the initial output fundamental voltage is determined according to the following formula: Previously, the method also includes: obtaining the effective value of the current of the grid-side AC power and the first preset coefficient ; Based on the effective value of the current of the grid-side AC and the first preset coefficient , the gain coefficient is determined by the following formula : .

[0010] In an exemplary embodiment, according to the initial output fundamental voltage Determining the output fundamental voltage includes: determining a first adjustment coefficient by the following formula : ;in, For the phase The maximum value of the imbalance in the first range, For the phase The minimum value of the imbalance degree in the first range, is the second preset coefficient; based on the first adjustment coefficient , the initial output fundamental voltage is calculated by the following formula Adjust to get the first output fundamental voltage , and according to the first output fundamental voltage Determine the output fundamental voltage: .

[0011] In an exemplary embodiment, the first output fundamental voltage Determining the output fundamental voltage includes: determining a second adjustment coefficient by the following formula : in, is the effective value of the rated current of the high-voltage cascade energy storage system, is the third preset coefficient; based on the first adjustment coefficient and / or the second adjustment coefficient , the first output fundamental voltage is given by the following formula Adjust to obtain the output fundamental voltage : .

[0012] In an exemplary embodiment, determining the zero-sequence voltage according to the second imbalance degree includes: determining the initial zero-sequence voltage by the following formula: , and according to the initial zero sequence voltage Determine the zero-sequence voltage: ;in, For the first phase Imbalance, For the second phase Unbalance, the first phase The unbalance degree is correlated with the second unbalance degree, and the second phase The imbalance degree is correlated with the second imbalance degree, is the angular frequency of the fundamental voltage, is the second preset coefficient, is the phase of the second grid-side current.

[0013] In an exemplary embodiment, the initial zero-sequence voltage Determining the zero-sequence voltage includes: determining a third adjustment coefficient by the following formula : ;in, For the phase The maximum value of the imbalance in the second range, For the phase The minimum value of the imbalance in the second range, is the gain coefficient, which is the effective value of the current of the grid-side AC power and the first preset coefficient The coefficient determined; and the fourth adjustment coefficient determined by the following formula : ;in, is the effective value of the grid-side alternating current, is the effective value of the rated current, is the fourth preset coefficient; based on the third adjustment coefficient and the fourth adjustment coefficient , the initial zero-sequence voltage is calculated by the following formula: Adjust to get zero sequence voltage : .

[0014] According to another aspect of the embodiment of the present application, there is also provided a The device for adjusting the imbalance degree is applied to a high-voltage cascade energy storage system, comprising: a sampling module for sampling the battery charge state of a three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result; a determination module for determining the phase internal state of the three-phase battery cluster according to the sampling result. Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. imbalance, obtaining a second imbalance; and a regulating module for determining an output fundamental voltage according to the first imbalance, and outputting a voltage at the output of the three-phase battery cluster. The output fundamental voltage is superimposed by each unit to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance.

[0015] According to another aspect of the embodiment of the present application, a computer-readable storage medium is further provided, wherein the computer-readable storage medium includes a stored program, wherein the program is configured to execute the above-mentioned How to adjust the imbalance.

[0016] According to another aspect of the embodiment of the present application, there is also provided an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, wherein the processor is configured to execute the above-mentioned How to adjust the imbalance.

[0017] According to another aspect of the embodiment of the present application, a computer program product is provided, including a computer program, wherein when the computer program is executed by a processor, How to adjust the imbalance.

[0018] In this application, the battery charge state of a three-phase battery cluster in a high-voltage cascade energy storage system is sampled, and the phase internal state of the three-phase battery cluster is determined according to the sampling results. Unbalance and phase Unbalance degree, thus according to the phase of the three-phase battery cluster Unbalance and phase The imbalance determines the output fundamental voltage and zero-sequence voltage, and uses the fundamental voltage and zero-sequence voltage to adjust the intra-phase imbalance and inter-phase imbalance of the three-phase battery cluster. The imbalance degree can be precisely adjusted, avoiding the lack of flexibility caused by the fixed parameter setting of the traditional method, thus solving the problem of traditional adjustment The problem of low flexibility of the imbalance method. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 This is an embodiment of the present application Hardware structure block diagram of a mobile terminal for adjusting the imbalance degree;

[0022] Figure 2 According to an embodiment of the present application Flowchart of the imbalance adjustment method;

[0023] Figure 3 According to an embodiment of the present application Schematic diagram of the process of determining the degree of imbalance;

[0024] Figure 4 An intra-phase battery cluster according to an embodiment of the present application Parameter adaptive equalization control block diagram;

[0025] Figure 5 is a schematic diagram of injecting a zero-sequence voltage vector according to an embodiment of the present application;

[0026] Figure 6 This is a block diagram of a phase-to-phase battery cluster state of charge balancing control according to an embodiment of the present application;

[0027] Figure 7 According to an embodiment of the present application Structural block diagram of the imbalance adjustment device. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0029] 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 sequential order. 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 a sequence 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.

[0030] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal of a method for adjusting SOC imbalance according to an embodiment of the present application. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1Only one is shown) a processor 102 (the processor 102 may include but is not limited to a microprocessor (MP) or a field programmable gate array (FPGA) and other processing devices) and a memory 104 for storing data. The mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It will be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components than shown, or with Figure 1 Different configurations shown.

[0031] The memory 104 can be used to store computer programs, such as software programs and modules of application software, such as the computer program corresponding to the method for detecting aerodynamic imbalance in the embodiments of the present application. The processor 102 executes the computer program stored in the memory 104 to execute various functional applications and data processing, thereby implementing the above-mentioned method. The memory 104 may include high-speed random access memory and may also include 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 memory remotely located relative to the processor 102, and these remote memories may be connected to the mobile 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.

[0032] Transmission device 106 is used to receive or transmit data via a network. A specific example of the aforementioned network may include a wireless network provided by the mobile terminal's communications provider. In one embodiment, transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to enable communication with the Internet. In another embodiment, transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0033] In order to solve the above problems, this embodiment provides a The imbalance adjustment method is applied to high voltage cascade energy storage system. Figure 2 According to an embodiment of the present application Flowchart of the imbalance adjustment method, such as Figure 2 As shown, the process includes the following steps S202-S206:

[0034] Step S202: sampling the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result;

[0035] Optionally, firstly, all three-phase battery clusters of the high-voltage cascade energy storage system are Sampling is performed to calculate the phase Unbalance, intra-phase Imbalance.

[0036] It should be noted that due to the battery It is a key factor in determining the charging and discharging capacity of the energy storage system and the battery life. Real-time sampling can ensure that the system accurately grasps the charge status of the battery pack.

[0037] Step S204: Determine the phase of the three-phase battery cluster according to the sampling result. Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. Unbalance degree, and obtain the second unbalance degree;

[0038] Alternatively, as Figure 3 As shown, according to the sampling results obtained in step S202, the system further analyzes and calculates the phase Unbalance and phase Imbalance, namely, first imbalance and second imbalance.

[0039] It should be noted that Unbalance refers to the difference between battery cells in the same phase. The inconsistency between The imbalance reflects the difference between battery clusters in different phases. By calculating the first and second imbalances within and between phases, the battery The degree of imbalance provides a basis for subsequent balance adjustment.

[0040] Step S206: Determine the output fundamental voltage according to the first imbalance degree, and superimpose the output fundamental voltage on the N cells of the three-phase battery cluster to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance.

[0041] Optionally, step S206 is the entire The core of the imbalance adjustment method includes two parts: (1) In-phase Imbalance adjustment: Based on the calculated first imbalance, the system determines an output fundamental voltage value. The fundamental voltage is a voltage that matches the fundamental frequency of the system. By controlling its magnitude and phase, a balanced current can be generated within the battery cluster, thereby eliminating the phase imbalance. Imbalance; when the phase is detected After the imbalance is eliminated, this method requires superimposing the output fundamental voltage on the AC side of each cell of the three-phase battery cluster. In this way, a specific balancing current can be generated in each battery cell to accelerate the phase The balancing process improves the balancing efficiency; (2) Unbalance adjustment: Based on the second unbalance, the system calculates and determines the zero-sequence voltage. Zero-sequence voltage is a special voltage in a three-phase system. It does not pass through the neutral point in a star connection, but can generate a balanced current between the three phases. By changing the magnitude and phase angle of the zero-sequence voltage, additional balanced current can be generated between the three-phase battery clusters to adjust the phase-to-phase balance. Unbalance. This method can effectively adjust the balance between different phases without being affected by the total power of the system. difference.

[0042] It should be noted that the above steps can be implemented to adapt to different Unbalance and phase current amplitude changes, avoiding the traditional The problem of reducing the balancing current in the balancing method improves the flexibility and adaptability of the system. The application of adjustment coefficient and adaptive current adjustment coefficient makes The equilibrium process can be When the imbalance degree is reduced or the phase current amplitude decreases, the balancing speed is still kept high, which avoids the slow balancing process and improves the overall performance of the energy storage system. Unbalance avoids excessive charge and discharge between battery cells, reduces thermal and electrical stress of the battery, thereby extending battery life and reducing system maintenance costs. The consistency of the high voltage cascade energy storage system is the key to ensure its performance. Consistency optimizes the system's charging and discharging capabilities and energy management, and improves the overall performance of the energy storage system.

[0043] The above steps are to sample the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system, thereby determining the phase internal state of the three-phase battery cluster according to the sampling results. Unbalance and phase Unbalance degree, thus according to the phase of the three-phase battery cluster Unbalance and phase The imbalance determines the output fundamental voltage and zero-sequence voltage, and uses the fundamental voltage and zero-sequence voltage to adjust the intra-phase imbalance and inter-phase imbalance of the three-phase battery cluster. The imbalance degree can be precisely adjusted, avoiding the lack of flexibility caused by the fixed parameter setting of the traditional method, thus solving the problem of traditional adjustment The problem of low flexibility of the imbalance method.

[0044] In an exemplary embodiment, determining the output fundamental voltage according to the first imbalance degree may be achieved by following the steps S11-S12:

[0045] Step S11: acquiring the angular frequency of the fundamental voltage of the high-voltage cascade energy storage system and the phase of the first grid-side current of the high-voltage cascade energy storage system;

[0046] Optionally, the system first obtains the fundamental voltage angular frequency of the high-voltage cascade energy storage system. This fundamental voltage angular frequency is the fundamental frequency of the system during operation, directly determining the fluctuation rate of the AC power and a key parameter for calculating the output fundamental voltage. The system also obtains the phase of the first grid-side current.

[0047] It should be noted that the grid-side current phase reflects the phase difference between current and voltage, and is crucial for controlling the direction and magnitude of the balancing current.

[0048] Step S12: Determine the initial output fundamental voltage according to the following formula: , and according to the initial output fundamental voltage Determine the output fundamental voltage:

[0049] ;

[0050] in, is the first imbalance, is the angular frequency of the fundamental voltage, is the phase of the first grid-side current, is the gain coefficient, which is the effective value of the current of the grid-side AC power of the high-voltage cascade energy storage system. and the first preset coefficient Determined coefficient.

[0051] It should be noted that this step is to The degree of imbalance is directly linked to the output of the fundamental voltage, so the magnitude of the output fundamental voltage is not only related to The real-time state of the imbalance is related to the system operation state (current RMS and current phase). As the imbalance decreases over time or the system current changes, the output fundamental voltage can also be adjusted adaptively to ensure Sustainability and efficiency of the balancing process.

[0052] It should be noted that the adaptive adjustment of the gain coefficient ensures that the output fundamental voltage can be adjusted according to Flexible adjustment of imbalance and system operation status is more flexible and changeable than traditional methods, which improves Balanced adaptability and speed. Real-time monitoring and adjustment ensures Under any working condition, it can be balanced, avoiding excessive differences in the state of charge between battery cells, thereby improving the stability and energy efficiency of the system. Imbalance reduces overcharge and discharge between battery cells, reduces battery thermal stress and electrical stress, helps to extend battery life and reduce system maintenance costs.

[0053] In an exemplary embodiment, the initial output fundamental voltage is determined according to the following formula: Previously, the method further includes the following steps S21-S22:

[0054] Step S21: Obtaining the effective value of the grid-side AC current and the first preset coefficient ;

[0055] Optionally, in step S21, the system monitors the grid-side AC current in real time and calculates the effective value of the current. The effective value of the current is a standard method for measuring the size of the AC current, which reflects the average energy level of the current over a period of time. At the same time, the system needs to preset a first preset coefficient, which is determined according to the design requirements of the system and the characteristics of the battery, and is used to adjust the gain coefficient to ensure Optimization of the equilibrium process.

[0056] It should be noted that this step provides key input parameters for the subsequent gain coefficient calculation to ensure that it can reflect the current operating status of the system.

[0057] Step S22: Based on the effective value of the current of the grid-side AC power and the first preset coefficient , the gain coefficient is determined by the following formula :

[0058] .

[0059] Optionally, based on the current RMS value and the first preset coefficient , determine the gain coefficient by the formula , which converts the gain factor to the effective current value and the first preset coefficient This means that when the system current amplitude decreases, the gain factor will increase accordingly to maintain The balancing current size during the balancing process ensures that the balancing efficiency is not affected by current changes.

[0060] It should be noted that the effective value of the current Dynamic coupling, the gain coefficient can adapt to the current changes under different working conditions, ensuring The consistency of the balanced rate improves the system's performance under low current conditions. The gain coefficient is adjusted based on the first preset coefficient, which makes The balancing strategy can be optimized according to the characteristics of the specific energy storage system and battery cluster, improving The adaptive adjustment of the gain coefficient helps maintain the accuracy and effect of the balance. System stability and energy efficiency during the balancing process, avoiding The over- or under-regulation of the balancing current reduces the uneven charge and discharge between battery cells, thereby improving the operating efficiency of the entire energy storage system and the battery life. , reducing the difference in charge state between battery cells, lowering system maintenance costs and battery failure rate, so that the high-voltage cascade energy storage system can maintain high reliability and economy in long-term operation.

[0061] It should be noted that this embodiment effectively overcomes the traditional The flexibility of the regulation method under current changes improves the high-voltage cascade energy storage system. The efficiency and accuracy of imbalance adjustment have a significant effect on improving the overall system performance and battery life.

[0062] In an exemplary embodiment, determining the output fundamental voltage according to the initial output fundamental voltage may be achieved by the following steps S31-S32:

[0063] Step S31: Determine the first adjustment coefficient using the following formula: :

[0064] ;

[0065] in, For the phase The maximum value of the imbalance in the first range, For the phase The minimum value of the imbalance degree in the first range, is the second preset coefficient;

[0066] It should be noted that the key to this step is to calculate the first adjustment coefficient, which reflects the phase Adjustment capability within the imbalance range. The calculation of the first adjustment coefficient is based on The range of variation of the imbalance degree makes the adjustment of the output fundamental voltage more sensitive. The actual fluctuation of the imbalance. When the imbalance is at a high level, the first adjustment coefficient is large, which can generate a large balancing current and accelerate Equilibrium process; on the contrary, when When the battery tends to be balanced, the first adjustment coefficient decreases and the balancing current also decreases accordingly, thus avoiding excessive balancing and ensuring the safety of the battery pack.

[0067] Step S32: Based on the first adjustment coefficient , the initial output fundamental voltage is calculated by the following formula Adjust to get the first output fundamental voltage , and according to the first output fundamental voltage Determine the output fundamental voltage:

[0068] .

[0069] It should be noted that the first output fundamental voltage is the product of the initial output fundamental voltage and the first adjustment coefficient. In this way, the output fundamental voltage can be automatically adjusted according to the change of the first adjustment coefficient, achieving more accurate and effective Balance control.

[0070] It should be noted that by adaptively adjusting the output fundamental voltage, this embodiment can more accurately control The balancing process avoids the inefficiency or over-balancing problems that may be caused by the "one-size-fits-all" control strategy. When the imbalance is large, the first adjustment coefficient is large, which makes the output fundamental voltage increase accordingly, thereby increasing the balancing current and accelerating the The calculation of the first adjustment factor takes into account the The real-time range of imbalance, which enables the system to adjust adaptively Balancing strategy to cope with different operating conditions, improving the overall adaptability and flexibility of the system. As the voltage tends to be balanced, the first adjustment coefficient decreases, avoiding excessive current in the balancing process, helping to reduce the energy loss of battery cells caused by excessive balancing operations and extending battery life. By accurately controlling the output fundamental voltage, this embodiment not only improves The balanced efficiency also optimizes the energy management of the system to ensure The rational distribution of the total energy of the system during the balancing process avoids energy waste.

[0071] In an exemplary embodiment, determining the output fundamental voltage according to the first output fundamental voltage may be achieved by following the steps S41-S42:

[0072] Step S41: Determine the second adjustment coefficient using the following formula: :

[0073]

[0074] in, is the effective value of the rated current of the high-voltage cascade energy storage system, is the third preset coefficient;

[0075] Optionally, the calculation of the second adjustment coefficient is based on the rated current effective value of the high-voltage cascade energy storage system and the third preset coefficient. The main purpose of this formula is to adjust the amplitude of the output fundamental voltage according to the relative size of the current system current and the rated current to ensure that the output fundamental voltage is stable at different current levels. Balancing process efficiency and safety.

[0076] It should be noted that when the actual operating current of the system is close to the rated current, the second adjustment coefficient is close to 0, which means that the adjustment of the output fundamental voltage is small; on the contrary, when the system current is lower than the rated current, the second adjustment coefficient will increase, and the adjustment range of the output fundamental voltage will also increase accordingly, thereby ensuring The balancing process is still effective under low current conditions.

[0077] Step S42: Based on the first adjustment coefficient and / or the second adjustment coefficient , the first output fundamental voltage is given by the following formula Adjust to obtain the output fundamental voltage :

[0078] .

[0079] Optionally, the final output fundamental voltage is the product of the first output fundamental voltage and the first adjustment coefficient and / or the second adjustment coefficient. This means that the final value of the output fundamental voltage not only takes into account The actual size of the imbalance (reflected by the first adjustment coefficient) also takes into account the relative relationship between the current operating current and the rated current of the system (reflected by the second adjustment coefficient), ensuring The effectiveness and adaptability of the balancing strategy under different operating conditions.

[0080] It should be noted that, through the dual adjustment of the first adjustment coefficient and the second adjustment coefficient, the output fundamental voltage can better adapt to The change of imbalance and the fluctuation of system operating current ensure The flexibility and efficiency of the balancing process. The first adjustment coefficient reflects The second adjustment coefficient takes into account the change of imbalance, and the influence of system operating current on the balancing process. The combination of the two makes the adjustment of output fundamental voltage more accurate and avoids The adaptive adjustment of the output fundamental voltage helps to maintain the system in the The stability of the balancing process, especially under low current conditions, can be effectively maintained through the amplification of the second adjustment coefficient. The stability of the balancing process and the size of the balancing current avoid the The strategy in this embodiment also optimizes energy utilization by precisely controlling the output fundamental voltage, avoiding unnecessary energy loss and ensuring Efficient use of energy in the balancing process. By avoiding excessive balancing current and adjusting The balancing strategy of this embodiment helps to reduce the stress of the battery cells and extend the service life of the battery pack.

[0081] It should be noted that in this embodiment The imbalance adjustment method introduces the first adjustment coefficient and the second adjustment coefficient to adjust the output fundamental voltage adaptively, which not only improves The balanced accuracy and efficiency also enhance the adaptability and stability of the system under different operating conditions, and have a significant effect on improving the performance of the high-voltage cascade energy storage system and extending the battery life.

[0082] In an exemplary embodiment, the determination of the zero-sequence voltage according to the second imbalance degree can be achieved by the following steps: determining the initial zero-sequence voltage by the following formula , and according to the initial zero sequence voltage Determine the zero-sequence voltage:

[0083] ;

[0084] in, For the first phase Imbalance, For the second phase Unbalance, the first phase The unbalance degree is correlated with the second unbalance degree, and the second phase The imbalance degree is correlated with the second imbalance degree, is the angular frequency of the fundamental voltage, is the second preset coefficient, is the phase of the second grid-side current.

[0085] Optionally, first define the injected zero-sequence voltage : , suppose the three-phase symmetrical current of the system is ( )for , then the additional power generated by the zero-sequence voltage ( 、 、 )for , use this power to eliminate the phase Unbalanced, just make the additional power proportional to the imbalance of each phase, that is, , where Is a positive number.

[0086] It should be noted that when the current of the energy storage system is not zero, the zero-sequence voltage can add a power to each phase. By changing the phase angle of the zero-sequence voltage, the distribution of the additional power on each phase can be controlled. Since the sum of the three-phase current is zero, the zero-sequence voltage does not affect the total power of the energy storage system. The vector analysis diagram is as follows Figure 5 As shown in Figure 1, after adding a zero-sequence component to the three-phase voltage, the output voltage of each phase of the power conversion system (PCS) changes. Therefore, as long as the zero-sequence voltage is properly selected The amplitude and phase angle can achieve the control of inter-phase power balance and further realize The purpose of balance.

[0087] It should be noted that this step combines the magnitude of the zero-sequence voltage with The zero sequence voltage is directly related to the phase imbalance of the system, taking into account the electrical parameters of the system operation (angular frequency and current phase). In this way, the zero sequence voltage can respond adaptively Changes in imbalance ensure that Under unbalanced conditions, the injection of zero-sequence voltage can effectively balance the phases. .

[0088] It should be noted that by combining the zero sequence voltage with Phase imbalance is directly linked, this embodiment can be based on The real-time change of the imbalance degree dynamically adjusts the magnitude and phase of the zero-sequence voltage to achieve phase-to-phase The adaptive adjustment of zero-sequence voltage takes into account the changes in system electrical parameters (such as angular frequency and current phase), which enables the high-voltage cascade energy storage system to maintain accurate balance under different operating conditions. Balanced efficiency. By precisely controlling the zero sequence voltage, The system over- or under-regulation caused by improper adjustment of phase imbalance enhances the stability and safety of the system. The dynamic adjustment of zero-sequence voltage helps to optimize the distribution and utilization of energy, avoid unnecessary energy loss, and improve the overall energy conversion efficiency of the energy storage system. Phase imbalance, this embodiment helps to reduce uneven charging and discharging between battery cells, reduce battery stress, and thus extend the service life of the battery pack.

[0089] In an exemplary embodiment, determining the zero-sequence voltage according to the initial zero-sequence voltage may be achieved by following steps S51 to S53:

[0090] Step S51: Determine the third adjustment coefficient using the following formula: :

[0091] ;

[0092] in, For the phase The maximum value of the imbalance in the second range, For the phase The minimum value of the imbalance in the second range, is the gain coefficient, which is the effective value of the current of the grid-side AC power and the first preset coefficient coefficient of determination;

[0093] Optionally, this formula is designed to allow the zero sequence voltage to be adjusted to reflect The actual change in imbalance ensures When the imbalance is large, the adjustment range of the zero-sequence voltage is also large, thus accelerating the Balanced speed; when When approaching equilibrium, the adjustment of zero-sequence voltage will be reduced to avoid over-balancing.

[0094] Step S52: Determine the fourth adjustment coefficient using the following formula: :

[0095] ;

[0096] in, is the effective value of the grid-side alternating current, is the effective value of the rated current, is the fourth preset coefficient;

[0097] It should be noted that the role of the fourth adjustment coefficient is that when the actual operating current of the system is lower than the rated current, by increasing the fourth adjustment coefficient, the amplitude of the zero-sequence voltage can be appropriately increased to ensure that the system is under low current conditions. The effectiveness of the balancing process.

[0098] Step S53: Based on the third adjustment coefficient and the fourth adjustment coefficient , the initial zero-sequence voltage is calculated by the following formula: Adjust to get zero sequence voltage :

[0099] .

[0100] Alternatively, this means that the final zero-sequence voltage is determined by the product of the initial zero-sequence voltage and the third adjustment coefficient and the fourth adjustment coefficient. In this way, the magnitude of the zero-sequence voltage not only takes into account The imbalance and current state also ensure that it can adapt to changes in system operating conditions, providing more adaptive and accurate Balance control.

[0101] It should be noted that the introduction of the third adjustment coefficient and the fourth adjustment coefficient enables the adjustment of the zero-sequence voltage to be adaptive. The change of imbalance and the fluctuation of system operating current ensure the Balanced efficiency. Reflected by the third adjustment coefficient The change of imbalance degree and the fourth adjustment coefficient take into account the influence of system operating current on the balancing process. The combination of the two makes the adjustment of zero-sequence voltage more accurate and avoids The adaptive adjustment of zero sequence voltage helps to maintain the stability of system operation, especially in During the phase imbalance adjustment process, the Improper adjustment may cause system performance degradation. The imbalance adjustment strategy not only improves Balanced efficiency also optimizes the utilization of system energy, avoids unnecessary energy loss, and improves the overall energy conversion efficiency of the energy storage system. Phase imbalance avoids unbalanced charging and discharging between battery cells, reduces battery stress, and thus helps to extend the service life of the battery pack.

[0102] It should be noted that, through the above steps, by introducing and applying the third adjustment coefficient and the fourth adjustment coefficient, not only the The flexibility and precision of inter-phase imbalance adjustment also improves the stability and energy efficiency of system operation, and has a significant positive impact on the performance improvement and battery life extension of high-voltage cascade energy storage systems.

[0103] Optionally, the battery When the discharge power is large and the charging power is small, the battery will be The discharge power becomes smaller and the charging power becomes larger.

[0104] Obviously, the embodiments described above are only part of the embodiments of the present invention, rather than all the 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 invention. Specifically:

[0105] First of all, it should be noted that in a high-voltage cascade energy storage system, the DC side of the power unit is connected to a high-voltage battery cluster, which is generally composed of multiple battery packs connected in series. Inside the pack are a large number of lithium iron phosphate cells connected in series and parallel, and equipped with a signal acquisition module, a cooling module, and a fire protection module. The high-voltage cascade energy storage system realizes power conversion by connecting power units in series. The whole system has a large capacity and a high degree of modularity, and the battery state of charge is Consistency has an important impact on the charge and discharge capacity of the entire device, so The research on balancing algorithms is the key to ensuring the performance and life of energy storage systems.

[0106] In a high-voltage cascade energy storage system, the battery state of charge Balancing is key to ensuring system performance and longevity. The balanced approach, while able to achieve However, the adjustment of the balanced power is not flexible enough and it is difficult to adapt to the needs of the system under different working conditions.

[0107] Therefore, the present application provides a parameter adaptive Balancing strategy, enabling it to adapt to parameters Balanced strategy is implemented in more diverse scenarios Fast balancing.

[0108] like Figure 3 As shown, firstly, the three-phase battery clusters of the high-voltage cascade energy storage system are Sampling is performed to calculate the phase Imbalance , phase within Imbalance .

[0109] 1. Phase The adaptive strategy for equalization parameters is as follows:

[0110] Assuming that the three phases of a three-phase battery are phase a, phase b, and phase c, taking phase a as an example, the SOC balance of each cell in the phase is achieved by superimposing a corresponding output fundamental voltage on the AC side of each cell:

[0111] ;

[0112] in is the effective value of the fundamental voltage, is the phase of the fundamental voltage, and Same meaning.

[0113] Then the additional power generated by the additional output voltage is:

[0114] ;

[0115] in is the effective value of the AC current on the grid side, is the phase of the grid-side current.

[0116] Use this power to eliminate the To solve the imbalance, we only need to make the additional power proportional to the imbalance degree of each unit in the phase, that is, In the formula is a positive constant.

[0117] Solving the above formula we get:

[0118] ;

[0119] Therefore, the superposition component of the output voltage at each unit AC can be taken as follows:

[0120] ;

[0121] In the formula The gain is selected according to the system requirements.

[0122] Considering that in actual operation, will decrease over time, causing the balancing current to decrease and introducing Equalization Adaptive Adjustment factor :

[0123] ;

[0124] in It is a positive constant and can be adjusted as needed. Will follow As the deviation decreases, it gradually increases, thereby adjusting the balancing current. When the deviation is 0, the balancing current can also drop to 0.

[0125] In addition, the introduction of Balanced adaptive current adjustment coefficient :

[0126] ;

[0127] in N is the rated current effective value, It is a positive constant and can be adjusted as needed. It will gradually increase as the grid-side current decreases, thereby adjusting the balancing current. When the deviation is 0, the balancing current can also drop to 0.

[0128] In summary, the superimposed components of the output voltage at the AC point of each unit are:

[0129] .

[0130] At this point, it can be proved that the active power added by each unit is equal to the active power of each unit. The imbalance degree is proportional to the voltage component of each unit in phase b and phase c. The block diagram of the battery pack balancing control within the phase is as follows: Figure 4 shown.

[0131] 2. Alternate The balance improvement strategy is as follows:

[0132] First, define the injected zero-sequence voltage :

[0133] ;

[0134] Assume that the three-phase symmetrical current of the system is:

[0135] ;

[0136] Then the additional power generated by the zero-sequence voltage is:

[0137] ;

[0138] Use this power to eliminate the phase To solve the imbalance, we only need to make the additional power proportional to the imbalance degree of each phase, that is:

[0139] ;

[0140] In the formula, λ is a positive constant.

[0141] When the current of the energy storage system is not zero, the zero-sequence voltage can add a power to each phase. By changing the phase angle of the zero-sequence voltage, the distribution of the additional power on each phase can be controlled. Since the sum of the three-phase current is zero, the zero-sequence voltage does not affect the total power of the energy storage system. The vector analysis diagram is as follows Figure 5 As shown in Figure 1, after adding a zero-sequence component to the three-phase voltage, the output voltage of each phase of the PCS changes. Therefore, as long as the zero-sequence voltage is properly selected The amplitude and phase angle can achieve the control of inter-phase power balance and further realize The purpose of balance.

[0142] Considering that in actual operation, It will become smaller over time, causing the phase-to-phase balancing current to become smaller, introducing Equalization Adaptive Adjustment factor :

[0143] ;

[0144] in It is a positive constant and can be adjusted as needed. Will follow As the deviation decreases, it gradually increases, thereby adjusting the phase-to-phase balanced current. When the deviation is 0, the balancing current can also drop to 0.

[0145] In addition, the introduction of Balanced adaptive current adjustment coefficient :

[0146] ;

[0147] in It is a positive constant and can be adjusted as needed. It will gradually increase as the grid-side current decreases, thereby adjusting the phase-to-phase balancing current. When the deviation is 0, the balancing current can also drop to 0.

[0148] consider is the inherent gain coefficient of phase balancing, and its size can be selected according to system needs. It should be noted that it cannot be too large, otherwise it will easily lead to system overmodulation and thus voltage distortion. Therefore, the total zero-sequence voltage injection expression is obtained as follows:

[0149] ;

[0150] In summary, the interphase battery cluster balancing control block diagram is as follows: Figure 6 shown.

[0151] It should be noted that the intra-phase balance increases the intra-phase Equalization Adaptive Adjustment factor , solved the problem The problem of reduced current balance in phases caused by the deviation increasing and decreasing with time increases the Balanced adaptive current adjustment coefficient , which solves the problem of reduced intra-phase balanced current caused by reduced grid-side current; inter-phase balancing increases inter-phase Equalization Adaptive Adjustment factor , solving the interphase The problem of phase-to-phase balanced current reduction caused by the deviation increasing and decreasing with time; Balanced adaptive current adjustment coefficient , which solves the problem of reduced inter-phase balanced current caused by reduced grid-side current.

[0152] It should be noted that the present application proposes a device with adjustable balanced power The balancing control method can make the high-voltage cascade energy storage system It has more advantages in terms of balancing speed and has higher flexibility than traditional strategies. It can customize parameter settings and can Realizing parameter adaptation in the equalization process to achieve better equalization effect has important theoretical and practical application value.

[0153] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the existing technology, can be embodied in the form of a software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for enabling 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.

[0154] In this embodiment, there is also provided a An imbalance adjustment device is applied to a high-voltage cascade energy storage system. This device is used to implement the above-mentioned embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" may refer to a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

[0155] Figure 7 According to an embodiment of the present application A structural block diagram of an imbalance adjustment device, the device comprising:

[0156] The sampling module 702 is used to sample the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result;

[0157] The determination module 704 is configured to determine the phase of the three-phase battery cluster according to the sampling result. Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. Unbalance degree, and obtain the second unbalance degree;

[0158] The adjustment module 706 is configured to determine an output fundamental voltage according to the first imbalance degree, and to superimpose the output fundamental voltage on the N units of the three-phase battery cluster to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance.

[0159] The above device samples the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system, thereby determining the phase internal state of the three-phase battery cluster according to the sampling result. Unbalance and phase Unbalance degree, thus according to the phase of the three-phase battery cluster Unbalance and phase The imbalance determines the output fundamental voltage and zero-sequence voltage, and uses the fundamental voltage and zero-sequence voltage to adjust the intra-phase imbalance and inter-phase imbalance of the three-phase battery cluster. The imbalance degree can be precisely adjusted, avoiding the lack of flexibility caused by the fixed parameter setting of the traditional method, thus solving the problem of traditional adjustment The problem of low flexibility of the imbalance method.

[0160] In an exemplary embodiment, the adjustment module 706 is further configured to obtain the angular frequency of the fundamental voltage of the high-voltage cascade energy storage system and the phase of the first grid-side current of the high-voltage cascade energy storage system; determine the initial output fundamental voltage according to the following formula: , and according to the initial output fundamental voltage Determine the output fundamental voltage: ;in, is the first imbalance, is the angular frequency of the fundamental voltage, is the phase of the first grid-side current, is the gain coefficient, which is the effective value of the current of the grid-side AC power of the high-voltage cascade energy storage system. and the first preset coefficient Determined coefficient.

[0161] In an exemplary embodiment, the adjustment module 706 is further configured to determine the initial output fundamental voltage according to the following formula: Before, obtain the effective value of the current of the grid-side AC power and the first preset coefficient ; Based on the effective value of the current of the grid-side AC and the first preset coefficient , the gain coefficient is determined by the following formula : .

[0162] In an exemplary embodiment, the adjustment module 706 is further configured to determine the first adjustment coefficient by the following formula: : ;in, For the phase The maximum value of the imbalance in the first range, For the phase The minimum value of the imbalance degree in the first range, is the second preset coefficient; based on the first adjustment coefficient , the initial output fundamental voltage is calculated by the following formula Adjust to get the first output fundamental voltage , and according to the first output fundamental voltage Determine the output fundamental voltage: .

[0163] In an exemplary embodiment, the adjustment module 706 is further configured to determine the second adjustment coefficient by the following formula: : in, is the effective value of the rated current of the high-voltage cascade energy storage system, is the third preset coefficient; based on the first adjustment coefficient and / or the second adjustment coefficient , the first output fundamental voltage is given by the following formula Adjust to obtain the output fundamental voltage : .

[0164] In an exemplary embodiment, the adjustment module 706 is further configured to determine the initial zero-sequence voltage by the following formula: , and according to the initial zero sequence voltage Determine the zero-sequence voltage: ; in, For the first phase Imbalance, For the second phase Unbalance, the first phase The unbalance degree is correlated with the second unbalance degree, and the second phase The imbalance degree is correlated with the second imbalance degree, is the angular frequency of the fundamental voltage, is the second preset coefficient, is the phase of the second grid-side current.

[0165] In an exemplary embodiment, the adjustment module 706 is further configured to determine the third adjustment coefficient by the following formula: : ;in, For the phase The maximum value of the imbalance in the second range, For the phase The minimum value of the imbalance in the second range, is a gain coefficient, which is calculated based on the effective value I of the grid-side AC current and the first preset coefficient The fourth adjustment coefficient is determined by the following formula : ; Wherein, I is the effective value of the current of the grid-side alternating current, is the effective value of the rated current, is the fourth preset coefficient; based on the third adjustment coefficient and the fourth adjustment coefficient , the initial zero-sequence voltage is calculated by the following formula: Adjust to get zero sequence voltage : .

[0166] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored. The computer program is configured to execute the steps of any of the above method embodiments when run.

[0167] Optionally, in this embodiment, the storage medium may be configured to store a computer program for performing the following steps:

[0168] S1, sampling the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result;

[0169] S2, determining the phase of the three-phase battery cluster according to the sampling result. Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. Unbalance degree, and obtain the second unbalance degree;

[0170] S3, determining an output fundamental voltage according to the first imbalance, and superimposing the output fundamental voltage on the N cells of the three-phase battery cluster to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance.

[0171] 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.

[0172] 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 here.

[0173] An embodiment of the present application further provides a computer program product, including a computer program, and the computer program performs the steps of any of the above method embodiments when executed by a processor.

[0174] An embodiment of the present application further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0175] Optionally, in this embodiment, the processor may be configured to execute the following steps through a computer program:

[0176] S1, sampling the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result;

[0177] S2, determining the phase of the three-phase battery cluster according to the sampling result. Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. Unbalance degree, and obtain the second unbalance degree;

[0178] S3, determining an output fundamental voltage according to the first imbalance, and superimposing the output fundamental voltage on the N cells of the three-phase battery cluster to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance.

[0179] 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.

[0180] 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 here.

[0181] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be implemented using a general-purpose computing device, they can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices, they can be implemented using program code executable by the computing device, and thus, 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 performed in a different order than herein, or they can be fabricated into separate integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0182] The above is only a preferred embodiment 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 The method for adjusting the imbalance degree is characterized in that: Applied to high-voltage cascade energy storage systems, including: Sampling the battery charge state of a three-phase battery cluster in a high-voltage cascade energy storage system to obtain a sampling result; Determine the phase of the three-phase battery cluster according to the sampling result Unbalance degree, obtain a first imbalance degree; and determine the phase-to-phase balance of the three-phase battery cluster according to the sampling result. Unbalance degree, and obtain the second unbalance degree; The output fundamental voltage is determined according to the first imbalance, and the output fundamental voltage is superimposed on the N cells of the three-phase battery cluster to adjust the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance; The method of determining the output fundamental voltage according to the first imbalance degree includes: obtaining the angular frequency of the fundamental voltage of the high-voltage cascade energy storage system and the phase of the first grid-side current of the high-voltage cascade energy storage system; determining the initial output fundamental voltage according to the following formula: , and according to the initial output fundamental voltage Determine the output fundamental voltage: ;in, is the first imbalance, is the angular frequency of the fundamental voltage, is the phase of the first grid-side current, is the gain coefficient, which is the effective value of the current of the grid-side AC power of the high-voltage cascade energy storage system. and the first preset coefficient coefficient of determination; According to the initial output fundamental voltage Determining the output fundamental voltage includes: determining a first adjustment coefficient by the following formula : ;in, For the phase The maximum value of the imbalance in the first range, For the phase The minimum value of the imbalance degree in the first range, is the second preset coefficient; based on the first adjustment coefficient , the initial output fundamental voltage is calculated by the following formula Adjust to get the first output fundamental voltage , and according to the first output fundamental voltage Determine the output fundamental voltage: .

2. The method according to claim 1, characterized in that The initial output fundamental voltage is determined according to the following formula Previously, the method also included: Obtain the effective value of the current of the grid-side AC power and the first preset coefficient ; Based on the effective value of the current of the grid-side AC and the first preset coefficient , the gain coefficient is determined by the following formula : 。 3. The method according to claim 1, characterized in that According to the first output fundamental voltage Determining the output fundamental voltage includes: The second adjustment coefficient is determined by the following formula : ； in, is the effective value of the rated current of the high-voltage cascade energy storage system, is the third preset coefficient; Based on the first adjustment coefficient and / or the second adjustment coefficient , the first output fundamental voltage is given by the following formula Adjust to obtain the output fundamental voltage : 。 4. The method according to claim 1, wherein The determining of the zero-sequence voltage according to the second imbalance degree includes: The initial zero-sequence voltage is determined by the following formula , and according to the initial zero sequence voltage Determine the zero-sequence voltage: ； in, For the first phase Imbalance, For the second phase Unbalance, the first phase The unbalance degree is correlated with the second unbalance degree, and the second phase The imbalance degree is correlated with the second imbalance degree, is the angular frequency of the fundamental voltage, is the second preset coefficient, is the phase of the second grid-side current.

5. The method according to claim 4, characterized in that According to the initial zero-sequence voltage Determining the zero-sequence voltage includes: The third adjustment coefficient is determined by the following formula : ； in, For the phase The maximum value of the imbalance in the second range, For the phase The minimum value of the imbalance in the second range, is the gain coefficient, which is the effective value of the current of the grid-side AC power and the first preset coefficient The coefficient of determination; and The fourth adjustment coefficient is determined by the following formula : ； in, is the effective value of the grid-side alternating current, is the effective value of the rated current, is the fourth preset coefficient; Based on the third adjustment coefficient and the fourth adjustment coefficient , the initial zero-sequence voltage is calculated by the following formula: Adjust to get zero sequence voltage : 。 6. A The device for adjusting the degree of imbalance is characterized in that: Applied to high-voltage cascade energy storage systems, including: A sampling module is used to sample the battery charge state of the three-phase battery cluster in the high-voltage cascade energy storage system to obtain a sampling result; a determination module for determining the intra-phase SOC imbalance of the three-phase battery cluster according to the sampling result to obtain a first imbalance; and determining the inter-phase SOC imbalance of the three-phase battery cluster according to the sampling result. Unbalance degree, and obtain the second unbalance degree; The regulating module is configured to determine an output fundamental voltage according to the first imbalance degree, and to superimpose the output fundamental voltage on the N units of the three-phase battery cluster to regulate the phase Unbalance; and determining the zero-sequence voltage according to the second unbalance, and determining the phase-to-phase Adjust the imbalance; Among them, the adjustment module is also used to determine the output fundamental voltage according to the first imbalance, including: obtaining the angular frequency of the fundamental voltage of the high-voltage cascade energy storage system and the phase of the first grid-side current of the high-voltage cascade energy storage system; determining the initial output fundamental voltage according to the following formula , and according to the initial output fundamental voltage Determine the output fundamental voltage: ;in, is the first imbalance, is the angular frequency of the fundamental voltage, is the phase of the first grid-side current, is the gain coefficient, which is the effective value of the current of the grid-side AC power of the high-voltage cascade energy storage system. and the first preset coefficient coefficient of determination; The regulating module is further configured to output the fundamental voltage according to the initial Determining the output fundamental voltage includes: determining a first adjustment coefficient by the following formula : ;in, For the phase The maximum value of the imbalance in the first range, For the phase The minimum value of the imbalance degree in the first range, is the second preset coefficient; based on the first adjustment coefficient , the initial output fundamental voltage is calculated by the following formula Adjust to get the first output fundamental voltage , and according to the first output fundamental voltage Determine the output fundamental voltage: 。 7. 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 5 when executed.

8. 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 5 through the computer program.

9. 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 5 is implemented.

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