Balancing control method and device for H-bridge cascaded energy storage system, medium and electronic equipment

Abstract

The invention relates to an H-bridge cascade energy storage system balance control method and device, a medium and electronic equipment, and the method comprises the steps: determining a battery charge state difference value between the battery charge states of a plurality of cascade energy storage sub-modules in a phase and a corresponding average battery charge state for any phase in an H-bridge cascade energy storage system; according to the charging and discharging state of the H-bridge cascade energy storage system, determining a proportionality coefficient for the battery charge state difference value; for any corresponding energy storage sub-module, determining modulation current for the energy storage sub-module according to the proportionality coefficient, the battery charge state difference value, the corresponding phase current and the battery capacity of each energy storage sub-module in the phase; and determining a modulation wave corresponding to the energy storage sub-module according to the total power of the phase, the total modulation voltage of the phase, the DC voltage of the energy storage sub-module and the corresponding modulation current, and performing equalization control on the energy storage sub-module according to the modulation wave.

Description

Technical Field

[0001] The present disclosure relates to the technical field of energy storage system control, and in particular to a method, device, medium and electronic equipment for balancing control of an H-bridge cascade energy storage system. Background Art

[0002] In AC power grid or DC power grid system, fixed capacity energy storage devices are often added to reduce the power fluctuation caused by access to the power grid and improve power supply reliability. Battery energy storage system is generally composed of energy storage batteries and high-power energy storage power conversion system. During the charging and discharging process of the battery energy storage system, there is an error between the battery state of charge of the energy storage battery and the average value of the battery state of charge of the phase. This error causes different battery state of charge change speeds for each energy storage battery, which is not conducive to the consistency of battery charging and discharging.

[0003] In the related art, according to the error between the battery state of charge of the ith energy storage battery and the average value of the battery state of charge of the phase, the differential current of the ith energy storage battery is obtained through a proportional coefficient amplification link. The differential current generates active power in the balancing process. Therefore, the total modulation wave of the phase where the ith energy storage battery is located is distributed according to the proportional coefficient, and then the modulation wave of the ith energy storage battery is obtained. Then, the current of the ith energy storage battery is modulated according to the modulation wave. However, this scheme of distributing the total modulation wave of the phase where the ith energy storage battery is located according to the proportional coefficient has poor accuracy of the modulation wave, resulting in poor balancing control effect on the battery energy storage system. Summary of the invention

[0004] The purpose of the present disclosure is to provide a balanced control method, device, medium and electronic equipment for an H-bridge cascade energy storage system, aiming to improve the accuracy of calculating the modulation current, thereby improving the accuracy of the modulation wave, thereby improving the balanced control effect of the battery energy storage system.

[0005] In order to achieve the above-mentioned object, the first aspect of the present disclosure provides a balanced control method for an H-bridge cascade energy storage system, comprising:

[0006] For any phase in the H-bridge cascade energy storage system, determining a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge;

[0007] Determining a proportionality coefficient for the battery state of charge difference according to the charge and discharge state of the H-bridge cascade energy storage system;

[0008] For any of the corresponding energy storage submodules, determining a modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase;

[0009] The modulation voltage corresponding to the energy storage submodule is determined according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, and the energy storage submodule is balanced controlled according to the modulation voltage.

[0010] Optionally, for any of the corresponding energy storage submodules, determining the modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase includes:

[0011] For any of the corresponding energy storage submodules, determining a balancing reference current corresponding to the energy storage submodule according to the proportional coefficient and the battery state of charge difference;

[0012] Determining the total battery capacity of the phase according to the battery capacity of each of the energy storage submodules in the phase;

[0013] Determine a power reference current corresponding to the energy storage submodule according to the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules;

[0014] A modulation current for the energy storage submodule is determined according to the corresponding balancing reference current and the power reference current.

[0015] Optionally, the modulation current i of the energy storage submodule is calculated by the following formula: xi :

[0016]

[0017] Among them, C x is the total battery capacity of the phase where the i-th energy storage submodule is located, K p is the proportionality coefficient, ΔSOC xi is the battery state of charge difference of the i-th energy storage submodule, C xi is the battery capacity of the i-th energy storage submodule, I x is the phase current corresponding to the i-th energy storage submodule.

[0018] Optionally, determining the modulation wave corresponding to the energy storage submodule according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current includes:

[0019] Calculating the power of each energy storage submodule according to the modulation current of the energy storage submodule and the DC voltage of the energy storage submodule on the DC side;

[0020] Calculate the proportion of the power of each energy storage submodule in the total power of the phase to obtain the power proportion coefficient;

[0021] According to the power proportional coefficient, the total phase modulation voltage of the phase where the energy storage submodule is located is divided into the modulation voltages of the various energy storage submodules.

[0022] Optionally, for any phase in the H-bridge cascade energy storage system, determining a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge includes:

[0023] For any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase;

[0024] Determining the sum of the battery states of charge of the plurality of cascaded energy storage submodules in the phase as the corresponding total battery state of charge;

[0025] Determining the corresponding average battery state of charge according to the number of the plurality of cascaded energy storage submodules in the phase and the total battery state of charge;

[0026] The difference between the battery state of charge of each of the energy storage submodules in the phase and the average battery state of charge is calculated to obtain the battery state of charge difference corresponding to the energy storage submodule.

[0027] Optionally, for any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase includes:

[0028] For any phase in the H-bridge cascade energy storage system, determining the module current of each of the energy storage submodules in the phase;

[0029] Determining a change in the battery state of charge of the energy storage submodule according to the battery capacity of the energy storage submodule and the module current;

[0030] The battery states of the plurality of cascaded energy storage submodules in the phase are determined according to the initial value of the battery state of charge of the energy storage submodule and the variation.

[0031] In a second aspect of the present disclosure, a balanced control device for an H-bridge cascade energy storage system is provided, comprising:

[0032] A first determination module is configured to determine, for any phase in the H-bridge cascade energy storage system, a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge;

[0033] A second determination module is configured to determine a proportionality coefficient for the battery state of charge difference according to the charge and discharge state of the H-bridge cascade energy storage system;

[0034] A third determination module is configured to determine, for any of the corresponding energy storage submodules, a modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase;

[0035] The fourth determination module is configured to determine the modulation voltage corresponding to the energy storage submodule according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, and to perform balanced control on the energy storage submodule according to the modulation voltage.

[0036] Optionally, the third determining module is configured to:

[0037] For any of the corresponding energy storage submodules, determining a balancing reference current corresponding to the energy storage submodule according to the proportional coefficient and the battery state of charge difference;

[0038] Determining the total battery capacity of the phase according to the battery capacity of each of the energy storage submodules in the phase;

[0039] Determine a power reference current corresponding to the energy storage submodule according to the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules;

[0040] A modulation current for the energy storage submodule is determined according to the corresponding balancing reference current and the power reference current.

[0041] Optionally, the modulation current i of the energy storage submodule is calculated by the following formula: xi :

[0042]

[0043] Among them, C x is the total battery capacity of the phase where the i-th energy storage submodule is located, K p is the proportionality coefficient, ΔSOC xi is the battery state of charge difference of the i-th energy storage submodule, C xi is the battery capacity of the i-th energy storage submodule, I x is the phase current corresponding to the i-th energy storage submodule.

[0044] Optionally, the fourth determining module is configured to:

[0045] Calculating the power of each energy storage submodule according to the modulation current of the energy storage submodule and the DC voltage of the energy storage submodule on the DC side;

[0046] Calculate the proportion of the power of each energy storage submodule in the total power of the phase to obtain the power proportion coefficient;

[0047] According to the power proportional coefficient, the total phase modulation voltage of the phase where the energy storage submodule is located is divided into the modulation voltages of the various energy storage submodules.

[0048] Optionally, the first determining module is configured to:

[0049] For any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase;

[0050] Determining the sum of the battery states of charge of the plurality of cascaded energy storage submodules in the phase as the corresponding total battery state of charge;

[0051] Determining the corresponding average battery state of charge according to the number of the plurality of cascaded energy storage submodules in the phase and the total battery state of charge;

[0052] The difference between the battery state of charge of each of the energy storage submodules in the phase and the average battery state of charge is calculated to obtain the battery state of charge difference corresponding to the energy storage submodule.

[0053] Optionally, the first determining module is configured to:

[0054] For any phase in the H-bridge cascade energy storage system, determining the module current of each of the energy storage submodules in the phase;

[0055] Determining a change in the battery state of charge of the energy storage submodule according to the battery capacity of the energy storage submodule and the module current;

[0056] The battery states of the plurality of cascaded energy storage submodules in the phase are determined according to the initial value of the battery state of charge of the energy storage submodule and the variation.

[0057] According to a third aspect of the present disclosure, there is provided a non-temporary computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0058] According to a fourth aspect of the present disclosure, there is provided an electronic device, comprising:

[0059] a memory having a computer program stored thereon;

[0060] A processor is used to execute the computer program in the memory to implement the steps of any one of the methods in the first aspect.

[0061] Through the above technical solution, at least the following beneficial effects can be achieved:

[0062] By determining the modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each energy storage submodule in the phase, the accuracy of calculating the modulation current is improved, and then the accuracy of the modulation wave is improved, thereby improving the balancing control effect of the battery energy storage system.

[0063] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0065] Figure 1 It is a flow chart of a method for balancing control of an H-bridge cascade energy storage system according to an exemplary embodiment.

[0066] Figure 2 An implementation according to an exemplary embodiment is shown Figure 1 Flow chart of step S3 in FIG.

[0067] Figure 3 It is a schematic diagram showing balanced control of an H-bridge cascade energy storage system according to an exemplary embodiment.

[0068] Figure 4 It is a comparison diagram of balanced control effects of an H-bridge cascade energy storage system according to an exemplary embodiment.

[0069] Figure 5 It is a block diagram of a balancing control device for an H-bridge cascade energy storage system according to an exemplary embodiment.

[0070] Figure 6 It is a block diagram of an electronic device according to an exemplary embodiment. DETAILED DESCRIPTION

[0071] The specific implementation of the present disclosure is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described herein is only used to illustrate and explain the present disclosure, and is not used to limit the present disclosure.

[0072] The present disclosure provides an H-bridge cascade energy storage system balancing control method, which is applied to a battery management system. Figure 1As shown, including:

[0073] In step S1, for any phase in the H-bridge cascade energy storage system, a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge is determined;

[0074] It can be explained that the H-bridge cascade energy storage system may include multiple phases, for example, the H-bridge cascade energy storage system includes three phases, each phase includes multiple cascaded energy storage submodules. Each energy storage submodule includes an energy storage power conversion system composed of a battery unit and an H-bridge.

[0075] In step S2, a proportionality coefficient for the battery state of charge difference is determined according to the charge and discharge state of the H-bridge cascade energy storage system.

[0076] In the charging state, if the difference between the battery state of charge SOC (State of Charge) of the energy storage submodule in the phase and the average battery state of charge of the phase is too large, the energy storage submodule needs a larger current to charge, and the proportional coefficient Kp needs to be a positive value; in the discharging state, if the difference between the battery state of charge SOC of the energy storage submodule in the phase and the average battery state of charge of the phase is too large, the energy storage submodule needs a smaller current to discharge, and the proportional coefficient Kp needs to be a negative value. And within a certain range, the proportional coefficient Kp can be proportional to the difference.

[0077] For example, if the SOC of the i-th energy storage submodule of phase A deviates too much from the average battery state of charge of phase A, the i-th submodule needs a larger current to charge, and the proportional coefficient Kp needs to be a positive value. The larger the difference, the larger the value of the proportional coefficient Kp. During discharge, if the SOC of the i-th submodule of phase A deviates too much from the average SOC of the submodules of phase A, the i-th submodule needs to be discharged less, and the proportional coefficient Kp needs to be a negative value. The larger the difference, the larger the absolute value of the proportional coefficient Kp.

[0078] In step S3, for any of the corresponding energy storage submodules, a modulation current for the energy storage submodule is determined according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase;

[0079] Among them, in the embodiment of the present disclosure, it is necessary to calculate the total battery capacity of the phase according to the battery capacity of each of the energy storage submodules in the phase, and then determine the modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules in the phase.

[0080] In step S4, the modulation voltage corresponding to the energy storage submodule is determined according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, and the energy storage submodule is balanced controlled according to the modulation voltage.

[0081] The above technical solution determines the modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each energy storage submodule in the phase, thereby improving the accuracy of calculating the modulation current, and then improving the accuracy of the modulation wave, thereby improving the balanced control effect of the battery energy storage system.

[0082] Alternatively, see Figure 2 As shown, in step S3, for any of the corresponding energy storage submodules, the modulation current for the energy storage submodule is determined according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase, including:

[0083] In step S31, for any of the corresponding energy storage submodules, a balancing reference current corresponding to the energy storage submodule is determined according to the proportional coefficient and the battery state of charge difference;

[0084] In the embodiment of the present disclosure, different battery charge states have different effects on the balancing reference current. For example, during the discharge process, if the battery charge state of the ith submodule is too small, the value of the balancing reference current of the ith submodule needs to be reduced accordingly. It can be calculated by the following formula:

[0085]

[0086] Among them, SOCx is the average battery state of charge of any phase in the H-bridge cascade energy storage system, SOC value, SOC xi is the battery charge state of the i-th energy storage submodule, and Kp is the proportional coefficient corresponding to the i-th energy storage submodule.

[0087] In step S32, the total battery capacity of the phase is determined according to the battery capacity of each of the energy storage submodules in the phase;

[0088] Among them, C x1 to C xn is the battery capacity of each energy storage submodule in any phase, then the total battery capacity of this phase is:

[0089] In step S33, a power reference current corresponding to the energy storage submodule is determined according to the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules;

[0090] In the embodiment of the present disclosure, the power reference current corresponding to any energy storage submodule is calculated by the following formula:

[0091]

[0092] Among them, i bx is the phase current corresponding to each i-th energy storage submodule.

[0093] In step S34, a modulation current for the energy storage submodule is determined according to the corresponding balancing reference current and the power reference current.

[0094] Optionally, the modulation current i of the energy storage submodule is calculated by the following formula: xi :

[0095]

[0096] Among them, C x is the total battery capacity of the phase where the i-th energy storage submodule is located, K p is the proportionality coefficient, ΔSOC xi is the battery state of charge difference of the i-th energy storage submodule, C xi is the battery capacity of the i-th energy storage submodule, I x is the phase current corresponding to the i-th energy storage submodule.

[0097] Optionally, determining the modulation wave corresponding to the energy storage submodule according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current includes:

[0098] Calculating the power of each energy storage submodule according to the modulation current of the energy storage submodule and the DC voltage of the energy storage submodule on the DC side;

[0099] Calculate the proportion of the power of each energy storage submodule in the total power of the phase to obtain the power proportion coefficient;

[0100] According to the power proportional coefficient, the total phase modulation voltage of the phase where the energy storage submodule is located is divided into the modulation voltages of the various energy storage submodules.

[0101] Based on the modulation current of the energy storage submodule and the DC voltage of the energy storage submodule on the DC side, the power of each energy storage submodule can be calculated, and further, the proportion of the power of each energy storage submodule in the total power of the phase is calculated to obtain the power proportional coefficient. The power proportional coefficient can correspond to the proportion of the output voltage of each energy storage submodule on the AC side in the total voltage, and the total phase modulation voltage of the phase where the energy storage submodule is located is divided into the modulation voltages of each energy storage submodule according to this proportion.

[0102] Optionally, for any phase in the H-bridge cascade energy storage system, determining a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge includes:

[0103] For any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase;

[0104] Determining the sum of the battery states of charge of the plurality of cascaded energy storage submodules in the phase as the corresponding total battery state of charge;

[0105] Determining the corresponding average battery state of charge according to the number of the plurality of cascaded energy storage submodules in the phase and the total battery state of charge;

[0106] The difference between the battery state of charge of each of the energy storage submodules in the phase and the average battery state of charge is calculated to obtain the battery state of charge difference corresponding to the energy storage submodule.

[0107] Optionally, for any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase includes:

[0108] For any phase in the H-bridge cascade energy storage system, determining the module current of each of the energy storage submodules in the phase;

[0109] Determining a change in the battery state of charge of the energy storage submodule according to the battery capacity of the energy storage submodule and the module current;

[0110] The battery states of the plurality of cascaded energy storage submodules in the phase are determined according to the initial value of the battery state of charge of the energy storage submodule and the variation.

[0111] In the embodiment of the present disclosure, within a certain period of time, the change in the battery state of charge of the energy storage submodule is the ratio of the current I to the battery capacity, and the battery state of charge of the energy storage submodule can be calculated by the following formula:

[0112]

[0113] Among them, SOC x0 is the initial value of the battery state of charge of the i-th energy storage submodule in any phase, SOC Δ is the change in the battery state of charge of the i-th energy storage submodule within Δt.

[0114] It can be seen from the above formula that when the battery capacities of the energy storage submodules in the H-bridge cascade energy storage system are inconsistent, in order to ensure the balance of the battery charge state in the phase, the following conditions must be met:

[0115]

[0116] Among them, I b1 To I bn is the current of multiple cascaded energy storage submodules in any phase, C1 to C n is the battery capacity of multiple cascaded energy storage submodules in any phase, I bx is the phase current, C x is the total battery capacity of this phase.

[0117] The technical solution of the present disclosure is exemplarily described below by means of an embodiment. Figure 3 As shown, in this embodiment, phase A is taken as an example for explanation. First, according to the battery state of charge SOC of each energy storage submodule cascaded in phase A, Ai , calculate the average battery state of charge SOC of phase A A , and then calculate the battery state of charge SOC of each energy storage submodule in phase A Ai The average battery state of charge SOC of phase A A The difference between the battery state of charge ΔSOC Ai .

[0118] Furthermore, according to the charge and discharge signal I x Determine the proportionality factor K p The positive and negative and size of the battery state of charge difference ΔSOC Ai and proportionality factor K p , calculate the balanced reference current ΔI i .

[0119] In addition, the phase current corresponding to phase A can be determined based on the total power and voltage of phase A, and then the total battery capacity of phase A can be determined. The battery capacity C of each energy storage submodule in phase A Ai , the power reference current is calculated.

[0120] Further, the balanced reference current ΔI is calculated i The sum of the power reference current and the modulation current of each energy storage submodule is obtained. And calculate the modulation current of the energy storage submodule The DC voltage V of the energy storage submodule on the DC side bAi The product of the power of each energy storage submodule is obtained; the phase current i of phase A is calculated A The phase voltage v of phase A AO The total power of phase A is obtained by multiplying the power of each energy storage submodule by the total power of the phase in which it is located, and then the power ratio coefficient is obtained; according to the power ratio coefficient, the total phase modulation voltage v of the phase in which the energy storage submodule is located is converted into AO * Divided into the modulation voltage I of each energy storage submodule Ai .

[0121] Figure 4 As shown, compared with no balancing control, the technical solution of the present application can significantly slow down the reduction of the battery state of charge of the energy storage submodule. Secondly, if two energy storage submodules of the same phase use the technical solution of the present application, the difference between the battery states of charge is small, and, compared with the balancing control method in the related art, the battery state of charge is reduced less, and a better balancing control effect can be achieved.

[0122] The present disclosure also provides an H-bridge cascade energy storage system balancing control device, see Figure 5 As shown, the H-bridge cascade energy storage system balancing control device 500 includes:

[0123] A first determination module 510 is configured to determine, for any phase in the H-bridge cascade energy storage system, a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge;

[0124] A second determination module 520 is configured to determine a proportionality coefficient for the battery state of charge difference according to the charge and discharge state of the H-bridge cascade energy storage system;

[0125] A third determination module 530 is configured to determine, for any of the corresponding energy storage submodules, a modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current, and the battery capacity of each of the energy storage submodules in the phase;

[0126] The fourth determination module 540 is configured to determine the modulation voltage corresponding to the energy storage submodule according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, and perform balanced control on the energy storage submodule according to the modulation voltage.

[0127] Optionally, the third determining module 530 is configured to:

[0128] For any of the corresponding energy storage submodules, determining a balancing reference current corresponding to the energy storage submodule according to the proportional coefficient and the battery state of charge difference;

[0129] Determining the total battery capacity of the phase according to the battery capacity of each of the energy storage submodules in the phase;

[0130] Determine a power reference current corresponding to the energy storage submodule according to the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules;

[0131] A modulation current for the energy storage submodule is determined according to the corresponding balancing reference current and the power reference current.

[0132] Optionally, the modulation current i of the energy storage submodule is calculated by the following formula: xi :

[0133]

[0134] Among them, C x is the total battery capacity of the phase where the i-th energy storage submodule is located, K p is the proportionality coefficient, ΔSOC xi is the battery state of charge difference of the i-th energy storage submodule, C xi is the battery capacity of the i-th energy storage submodule, I x is the phase current corresponding to the i-th energy storage submodule.

[0135] Optionally, the fourth determining module 540 is configured to:

[0136] Calculating the power of each energy storage submodule according to the modulation current of the energy storage submodule and the DC voltage of the energy storage submodule on the DC side;

[0137] Calculate the proportion of the power of each energy storage submodule in the total power of the phase to obtain the power proportion coefficient;

[0138] According to the power proportional coefficient, the total phase modulation voltage of the phase where the energy storage submodule is located is divided into the modulation voltages of the various energy storage submodules.

[0139] Optionally, the first determining module 510 is configured to:

[0140] For any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase;

[0141] Determining the sum of the battery states of charge of the plurality of cascaded energy storage submodules in the phase as the corresponding total battery state of charge;

[0142] Determining the corresponding average battery state of charge according to the number of the plurality of cascaded energy storage submodules in the phase and the total battery state of charge;

[0143] The difference between the battery state of charge of each of the energy storage submodules in the phase and the average battery state of charge is calculated to obtain the battery state of charge difference corresponding to the energy storage submodule.

[0144] Optionally, the first determining module 510 is configured to:

[0145] For any phase in the H-bridge cascade energy storage system, determining the module current of each of the energy storage submodules in the phase;

[0146] Determining a change in the battery state of charge of the energy storage submodule according to the battery capacity of the energy storage submodule and the module current;

[0147] The battery states of the plurality of cascaded energy storage submodules in the phase are determined according to the initial value of the battery state of charge of the energy storage submodule and the variation.

[0148] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0149] The embodiments of the present disclosure also provide a non-temporary computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the steps of the method described in any one of the aforementioned embodiments are implemented.

[0150] The present disclosure also provides an electronic device, including:

[0151] a memory having a computer program stored thereon;

[0152] A processor is used to execute the computer program in the memory to implement the steps of the method in any one of the aforementioned embodiments.

[0153] Figure 6 FIG. 7 is a block diagram of an electronic device 700 according to an exemplary embodiment. Figure 6 As shown, the electronic device can be configured as a battery management system, and the electronic device 700 can include: a processor 701, a memory 702. The electronic device 700 can also include one or more of a multimedia component 703, an input / output (I / O) interface 704, and a communication component 705.

[0154] Among them, the processor 701 is used to control the overall operation of the electronic device 700 to complete all or part of the steps in the above-mentioned H-bridge cascade energy storage system balancing control method. The memory 702 is used to store various types of data to support the operation of the electronic device 700. These data may include instructions for any application or method used to operate on the electronic device 700, as well as application-related data. The memory 702 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (Static Random Access Memory, referred to as SRAM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, referred to as EEPROM), erasable programmable read-only memory (Erasable Programmable Read-Only Memory, referred to as EPROM), programmable read-only memory (Programmable Read-Only Memory, referred to as PROM), read-only memory (Read-Only Memory, referred to as ROM), magnetic memory, flash memory, disk or optical disk. The multimedia component 703 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include at least one speaker for outputting audio signals. The I / O interface 704 provides an interface between the processor 701 and other interface modules, and the other interface modules may be keyboards, mice, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 705 is used for wired or wireless communication between the electronic device 700 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more of them, is not limited here. Therefore, the corresponding communication component 705 may include: Wi-Fi module, Bluetooth module, NFC module, etc. Thus, the equalization control result can be reported to the upper computer.

[0155] In an exemplary embodiment, the electronic device 700 can be implemented by one or more application specific integrated circuits (ASIC), digital signal processors (DSP), digital signal processing devices (DSPD), programmable logic devices (PLD), field programmable gate arrays (FPGA), controllers, microcontrollers, microprocessors or other electronic components to execute the above-mentioned H-bridge cascade energy storage system balancing control method.

[0156] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided, and when the program instructions are executed by a processor, the steps of the above-mentioned H-bridge cascade energy storage system balancing control method are implemented. For example, the computer-readable storage medium can be the above-mentioned memory 702 including program instructions, and the above-mentioned program instructions can be executed by the processor 701 of the electronic device 700 to complete the above-mentioned H-bridge cascade energy storage system balancing control method.

[0157] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings; however, the present disclosure is not limited to the specific details in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope of the present disclosure.

[0158] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0159] In addition, various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A balanced control method for an H-bridge cascade energy storage system, characterized in that: include: For any phase in the H-bridge cascade energy storage system, determining a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge; Determining a proportionality coefficient for the battery state of charge difference according to the charge and discharge state of the H-bridge cascade energy storage system; For any of the corresponding energy storage submodules, determining a modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase; The modulation voltage corresponding to the energy storage submodule is determined according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, and the energy storage submodule is balanced controlled according to the modulation voltage.

2. The method according to claim 1, characterized in that The step of determining the modulation current for any of the corresponding energy storage submodules according to the proportional coefficient, the battery state of charge difference, the corresponding phase current, and the battery capacity of each of the energy storage submodules in the phase comprises: For any of the corresponding energy storage submodules, determining a balancing reference current corresponding to the energy storage submodule according to the proportional coefficient and the battery state of charge difference; Determining the total battery capacity of the phase according to the battery capacity of each of the energy storage submodules in the phase; Determine a power reference current corresponding to the energy storage submodule according to the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules; A modulation current for the energy storage submodule is determined according to the corresponding balancing reference current and the power reference current.

3. The method according to claim 2, characterized in that The modulation current i of the energy storage submodule is calculated by the following formula: xi : Among them, C x is the total battery capacity of the phase where the i-th energy storage submodule is located, K p is the proportionality coefficient, ΔSOC xi is the battery state of charge difference of the i-th energy storage submodule, C xi is the battery capacity of the i-th energy storage submodule, I x is the phase current corresponding to the i-th energy storage submodule.

4. The method according to claim 1, characterized in that: The determining, according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, a modulation wave corresponding to the energy storage submodule comprises: Calculating the power of each energy storage submodule according to the modulation current of the energy storage submodule and the DC voltage of the energy storage submodule on the DC side; Calculate the proportion of the power of each energy storage submodule in the total power of the phase to obtain the power proportion coefficient; According to the power proportional coefficient, the total phase modulation voltage of the phase where the energy storage submodule is located is divided into the modulation voltages of the various energy storage submodules.

5. The method according to claim 1, characterized in that The step of determining, for any phase in the H-bridge cascade energy storage system, a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge comprises: For any phase in the H-bridge cascade energy storage system, determining the battery charge state of a plurality of cascaded energy storage submodules in the phase; Determining the sum of the battery states of charge of the plurality of cascaded energy storage submodules in the phase as the corresponding total battery state of charge; Determining the corresponding average battery state of charge according to the number of the plurality of cascaded energy storage submodules in the phase and the total battery state of charge; The difference between the battery state of charge of each of the energy storage submodules in the phase and the average battery state of charge is calculated to obtain the battery state of charge difference corresponding to the energy storage submodule.

6. The method according to claim 5, characterized in that The step of determining the battery charge state of a plurality of cascaded energy storage submodules in any phase of the H-bridge cascaded energy storage system comprises: For any phase in the H-bridge cascade energy storage system, determining the module current of each of the energy storage submodules in the phase; Determining a change in the battery state of charge of the energy storage submodule according to the battery capacity of the energy storage submodule and the module current; The battery states of the plurality of cascaded energy storage submodules in the phase are determined according to the initial value of the battery state of charge of the energy storage submodule and the variation.

7. An H-bridge cascade energy storage system balancing control device, characterized in that: include: A first determination module is configured to determine, for any phase in the H-bridge cascade energy storage system, a battery state of charge difference between a battery state of charge of a plurality of cascaded energy storage submodules in the phase and a corresponding average battery state of charge; A second determination module is configured to determine a proportionality coefficient for the battery state of charge difference according to the charge and discharge state of the H-bridge cascade energy storage system; A third determination module is configured to determine, for any of the corresponding energy storage submodules, a modulation current for the energy storage submodule according to the proportional coefficient, the battery state of charge difference, the corresponding phase current and the battery capacity of each of the energy storage submodules in the phase; The fourth determination module is configured to determine the modulation voltage corresponding to the energy storage submodule according to the total power of the phase, the total phase modulation voltage, the DC voltage of the energy storage submodule and the corresponding modulation current, and to perform balanced control on the energy storage submodule according to the modulation voltage.

8. The device according to claim 7, characterized in that The third determining module is configured to: For any of the corresponding energy storage submodules, determining a balancing reference current corresponding to the energy storage submodule according to the proportional coefficient and the battery state of charge difference; Determining the total battery capacity of the phase according to the battery capacity of each of the energy storage submodules in the phase; Determine a power reference current corresponding to the energy storage submodule according to the corresponding phase current, the total battery capacity and the battery capacity of each of the energy storage submodules; A modulation current for the energy storage submodule is determined according to the corresponding balancing reference current and the power reference current.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are implemented.

10. An electronic device, characterized in that: include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to any one of claims 1 to 6.

Images