A power control method and system for energy storage system

Abstract

The present invention provides a power control method and system for an energy storage system, which belongs to the technical field of energy storage devices, and specifically comprises: determining the output power range of a reliable output combiner box based on the remaining capacity of corresponding battery packs of different reliable output combiner boxes and historical discharge curves; determining the regulation scheme of the energy storage system by using the output power range of the reliable output combiner box with the energy storage regulation power of the energy storage system as a constraint condition; determining the optimal regulation scheme by the number of reliable output combiner boxes in different regulation schemes and the output power ranges of different reliable output combiner boxes; performing regulation output of the energy storage system by using the optimal regulation scheme; determining the output power of different reliable output combiner boxes by using the remaining capacity of corresponding battery packs of different reliable output combiner boxes after output and the reliability coefficients at different output powers, thereby improving the reliability of energy storage regulation of the energy storage system.

Description

Technical Field

[0001] The present invention belongs to the technical field of energy storage devices, and in particular relates to a power control method and system for an energy storage system. Background Art

[0002] With the rapid development of energy storage technology, energy storage systems have gradually become a key technical means to respond to grid peak and frequency regulation, greatly improving the safety and stability of grid operation.

[0003] In order to adjust the output power of the energy storage system and ensure the operational reliability and safety of the energy storage system, the invention patent application CN202410021015.X "An output power adjustment method and computer device for energy storage inverter" realizes dynamic adjustment of the output power according to the similarity of the output current waveforms of the inverter and the combiner box, thereby ensuring the power quality of the output power. However, at the same time, the following technical problems exist:

[0004] For energy storage systems, due to the limitations of battery characteristics, the output power range of batteries is not always constant in different capacity ranges. Generally speaking, the lower the remaining capacity, the lower the output power. Therefore, if the output power of the energy storage system cannot be controlled in combination with the remaining capacity of the battery, the reliability of the operation of the energy storage system cannot be guaranteed.

[0005] In response to the above technical problems, the present invention provides a power control method and system for an energy storage system. Summary of the invention

[0006] To achieve the purpose of the present invention, the present invention adopts the following technical solutions:

[0007] According to one aspect of the present invention, a power control method for an energy storage system is provided.

[0008] A power control method for an energy storage system, specifically comprising:

[0009] S1 determines the battery packs connected to different combiner boxes in the energy storage system and uses them as corresponding battery packs, determines the working reliability of different combiner boxes according to the remaining capacity and historical discharge curves of different corresponding battery packs, and determines the reliable output combiner box among the combiner boxes using the working reliability;

[0010] S2 determines the reliability coefficient of the reliable output combiner box at different output powers based on the remaining capacity and historical discharge curve of the corresponding battery pack of different reliable output combiner boxes, and determines the output power range of the different reliable output combiner boxes using the reliability coefficient;

[0011] S3 takes the energy storage regulation power of the energy storage system as a constraint condition, uses the output power range of the reliable output combiner box to determine the regulation scheme of the energy storage system, and determines the optimal regulation scheme through the number of reliable output combiner boxes in different regulation schemes and the output power ranges of different reliable output combiner boxes;

[0012] S4 uses the optimal adjustment scheme to adjust the output of the energy storage system, and determines the output power of different reliable output combiner boxes based on the remaining capacity of the corresponding battery pack after the output and the reliability coefficient at different output powers.

[0013] The beneficial effects of the present invention are:

[0014] 1. In the present invention, a reliable output combiner box in the combiner box is determined according to the remaining capacity and historical discharge curves of different corresponding battery packs, thereby achieving a comprehensive consideration of the influence of the remaining capacity of the battery pack on the discharge efficiency, avoiding the influence of insufficient remaining capacity on the reliability of the output power of the combiner box, and also laying a foundation for using a reliable output combiner box to perform energy storage regulation of the energy storage system, improving the reliability of energy storage regulation, and avoiding the influence of sudden changes in output power on the reliability of energy storage regulation of the energy storage system.

[0015] 2. In the present invention, the output powers of different reliable output combiner boxes are determined based on the remaining capacity of the corresponding battery packs after output and the reliability coefficients at different output powers. On the basis of satisfying the reliability of energy storage regulation of the energy storage system, the energy storage regulation of the energy storage system is made more reliable by considering the reliability coefficient. At the same time, by further considering the remaining capacity of the corresponding battery packs after output, the regulation potential of the energy storage system after energy storage regulation is comprehensively guaranteed, thereby ensuring the reliability and stability of the operation of the energy storage system.

[0016] A further technical solution is that the battery pack connected to the combiner box is determined according to the corresponding connection relationship between the battery pack and the combiner box.

[0017] A further technical solution is that the remaining capacity of the corresponding battery pack is determined based on monitoring data of the battery pack.

[0018] A further technical solution is that the historical discharge curve of the corresponding battery pack is determined based on monitoring data of the historical discharge of the battery pack.

[0019] A further technical solution is that the method for determining the working reliability of the combiner box is:

[0020] Determine a historical discharge curve within different discharge depth intervals according to the remaining capacity of the corresponding battery pack, and determine a change in output power within different discharge depth intervals according to the historical discharge curve;

[0021] Determine the discharge depth interval in which the output power variation does not meet the requirement by using the output power variation, and use it as the power variation interval, and determine the output reliability of different corresponding battery packs according to the number of the power variation intervals;

[0022] The working reliability of the combiner box is determined based on the output reliabilities of different corresponding battery packs.

[0023] A further technical solution is that the working reliability of the combiner box ranges from 0 to 1, wherein when the working reliability of the combiner box is greater than a preset reliability threshold, the combiner box is determined to be a reliable output combiner box.

[0024] A further technical solution is that the output power range of the reliable output combiner box is determined according to the range of output power that meets the requirements of the reliability coefficient of the reliable output combiner box.

[0025] A further technical solution is that the optimal adjustment scheme is the adjustment scheme with the largest scheme adaptation coefficient.

[0026] A further technical solution is that the adjustment complexity of the adjustment scheme is determined according to the ratio of the number of reliable output combiner boxes in the adjustment scheme to the number of preset combiner boxes.

[0027] A further technical solution is that the method for determining the optimal adjustment solution is:

[0028] Based on the energy storage regulation power of the energy storage system, the output regulation power of different reliable output combiner boxes is determined according to equal power distribution, and the regulation reliability of different reliable output combiner boxes is determined according to the output regulation power of different reliable output combiner boxes and the endpoint deviation of the output power range of the reliable output combiner boxes;

[0029] Determine the average value of the regulation reliability in the regulation scheme by using the regulation reliabilities of different reliable output combiner boxes, and use the ratio of the average value of the regulation reliability to the number of reliable output combiner boxes in the regulation scheme to calculate the scheme adaptation coefficient of the regulation scheme;

[0030] The scheme adaptation coefficient is used to determine the optimal adjustment scheme among the adjustment schemes.

[0031] In a second aspect, the present invention provides a computer system comprising: a memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that: when the processor runs the computer program, it executes the above-mentioned power control method for an energy storage system.

[0032] Other features and advantages will be described in the following description. The objects and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and drawings.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.

[0035] Figure 1 is a flow chart of a power control method for an energy storage system;

[0036] Figure 2 is a flow chart of a method for determining the operating reliability of a combiner box;

[0037] Figure 3 is a flow chart of a method for determining a reliability coefficient;

[0038] Figure 4 is a flow chart of a method for determining an optimal adjustment solution;

[0039] Figure 5 It is a framework diagram of a computer system. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0041] For the energy storage system, the lower the remaining capacity of the battery, the lower its output power. Therefore, it is necessary to control the output power of the energy storage system in combination with the remaining capacity of the battery to avoid being unable to meet the frequency and peak regulation requirements of the grid side due to the remaining capacity being too low.

[0042] Working reliability: It is determined based on the remaining capacity of the corresponding battery pack and the historical discharge curve, and based on the proportion of the number of abnormal changes in output power in the historical discharge curve under the remaining capacity. If the proportion is 0.1, the working reliability is 0.9, and the junction box with a working reliability greater than 0.95 is regarded as a reliable output junction box.

[0043] Reliability coefficient: It is determined based on the proportion of times when the deviation between the actual output power and the output power of the reliable output combiner box under different output powers is greater than 10%. If the proportion of times when the deviation between the actual output power and the output power is greater than 10% is 0.2, the reliability coefficient is 0.8, and the output power range is determined for output powers above 0.9.

[0044] Optimal regulation scheme: It is determined by the number of reliable output combiner boxes in different regulation schemes and the output power ranges of different reliable output combiner boxes. Specifically, the endpoint deviation from the energy storage regulation power is determined based on the superposition of the output power ranges of the reliable output combiner boxes. The optimal regulation scheme is determined by the endpoint deviation and the number of reliable output combiner boxes. Specifically, if the endpoint deviation is 1MW, the energy storage regulation power is 10MW, the number of reliable output combiner boxes is 20, and the total number of combiner boxes in the energy storage system is 100, then 1 / 10-0.1 (20 / 100) = 0.08. Finally, the largest one is taken as the optimal regulation scheme.

[0045] Output power of reliable output combiner box: the output power of different reliable output combiner boxes is determined according to the reliability coefficients under different output powers, and the output power of the reliable output combiner box is determined specifically according to the reliability coefficients in proportion.

[0046] The specific contents include the following:

[0047] To solve the above problems, according to one aspect of the present invention, Figure 1 As shown, a power control method for an energy storage system is provided, which specifically includes:

[0048] S1 determines the battery packs connected to different combiner boxes in the energy storage system and uses them as corresponding battery packs, determines the working reliability of different combiner boxes according to the remaining capacity and historical discharge curves of different corresponding battery packs, and determines the reliable output combiner box among the combiner boxes using the working reliability;

[0049] Furthermore, the battery pack connected to the combiner box is determined according to the corresponding connection relationship between the battery pack and the combiner box.

[0050] It should be noted that the remaining capacity of the corresponding battery pack is determined based on the monitoring data of the battery pack.

[0051] It can be understood that the historical discharge curve of the corresponding battery pack is determined based on the monitoring data of the historical discharge of the battery pack.

[0052] Specifically, it should be noted that Figure 2 As shown, the method for determining the working reliability of the combiner box is:

[0053] Determine a historical discharge curve within different discharge depth intervals according to the remaining capacity of the corresponding battery pack, and determine a change in output power within different discharge depth intervals according to the historical discharge curve;

[0054] Determine the discharge depth interval in which the output power variation does not meet the requirement by using the output power variation, and use it as the power variation interval, and determine the output reliability of different corresponding battery packs according to the number of the power variation intervals;

[0055] The working reliability of the combiner box is determined based on the output reliabilities of different corresponding battery packs.

[0056] Furthermore, the working reliability of the combiner box has a value range of 0 to 1, wherein when the working reliability of the combiner box is greater than a preset reliability threshold, the combiner box is determined to be a reliable output combiner box.

[0057] It can be understood that when the variation slope of the output power in the discharge depth interval at the unit discharge capacity is not within the preset range, it is determined that the output power variation in the discharge depth interval does not meet the requirement.

[0058] In another possible embodiment, the method for determining the working reliability of the combiner box is:

[0059] Determine a historical discharge curve within different discharge depth intervals according to the remaining capacity of the corresponding battery pack, and determine a change in output power within different discharge depth intervals according to the historical discharge curve;

[0060] The output power variation is used to determine the discharge depth interval in which the output power variation does not meet the requirement, and the interval is used as the power variation interval, and the weight values ​​of different power variation intervals are determined according to the discharge depths corresponding to the different power variation intervals, and the output reliability of different corresponding battery packs is determined according to the sum of the weight values ​​of the different power variation intervals;

[0061] The output deviation battery pack in the corresponding battery pack is determined by using the output reliability, and the working reliability of the combiner box is determined by using the quantity ratio of the output deviation battery pack.

[0062] In another possible embodiment, the method for determining the working reliability of the combiner box is:

[0063] Determine a historical discharge curve within different discharge depth intervals according to the remaining capacity of the corresponding battery pack, and determine a change in output power within different discharge depth intervals according to the historical discharge curve;

[0064] Using the output power variation, determine whether there is a corresponding battery pack whose output power variation does not meet the required discharge depth range. If so, proceed to the next step. If not, determine the working reliability of the combiner box using the preset working reliability.

[0065] The discharge depth interval in which the output power variation does not meet the requirement is taken as the power variation interval, and the corresponding battery pack in which the power variation interval exists is taken as the power variation battery pack, and it is determined whether the number of the power variation battery packs meets the requirement, if so, proceed to the next step, if not, it is determined that the combiner box does not belong to the reliable output combiner box;

[0066] Determine the weight values ​​of different power variation intervals by the discharge depths corresponding to different power variation intervals, and determine whether there is an unreliable output battery pack in the power variation battery pack by using the weight values ​​of the power variation intervals. If so, determine that the combiner box does not belong to a reliable output combiner box. If not, proceed to the next step.

[0067] The output reliability of different corresponding battery packs is determined according to the sum of weight values ​​of different power variation intervals, the output deviation battery pack in the corresponding battery pack is determined by the output reliability, and the working reliability of the junction box is determined by the proportion of the output deviation battery packs.

[0068] S2 determines the reliability coefficient of the reliable output combiner box at different output powers based on the remaining capacity and historical discharge curve of the corresponding battery pack of different reliable output combiner boxes, and determines the output power range of the different reliable output combiner boxes using the reliability coefficient;

[0069] Specifically, Figure 3 As shown, the method for determining the reliability coefficient is:

[0070] Determine the output power of different corresponding battery packs under the output power according to the output power of the reliable output combiner box, and determine the maximum stable discharge time under the remaining capacity of the corresponding battery pack based on the output power and the historical discharge curve;

[0071] Determining discharge reliability coefficients of different corresponding battery packs based on the maximum stable discharge time;

[0072] The reliability coefficient of the reliable output combiner box at the output power is determined by the average value of the discharge reliability coefficients of different corresponding battery packs.

[0073] Further, the output power range of the reliable output combiner box is determined according to the range of output powers whose reliability coefficient of the reliable output combiner box meets the requirements.

[0074] In another possible embodiment, the method for determining the reliability coefficient is:

[0075] Determine the output power of different corresponding battery packs under the output power according to the output power of the reliable output combiner box, and determine the maximum stable discharge time under the remaining capacity of the corresponding battery pack based on the output power and the historical discharge curve;

[0076] Determine whether there is a corresponding battery pack whose maximum stable discharge time is less than a preset time, if so, determine that the reliability coefficient of the reliable output combiner box at the output power does not meet the requirement, if not, proceed to the next step;

[0077] Based on the output power and the historical discharge curve, the number of changes in the output power of different battery packs in the maximum stable discharge time is determined, and the output reliability of different corresponding battery packs is determined in combination with the change in the output power of different change times, and it is judged whether the number of corresponding battery packs whose output reliability is less than the preset reliability meets the requirements, if so, proceed to the next step, if not, it is determined that the reliability coefficient of the reliable output combiner box at the output power does not meet the requirements;

[0078] Based on the maximum stable discharge time and output reliability, the discharge reliability coefficients of different corresponding battery packs are determined, and it is judged whether the number of corresponding battery packs whose discharge reliability coefficients are less than a preset reliability threshold meets the requirements. If so, proceed to the next step; if not, it is determined that the reliability coefficient of the reliable output combiner box at the output power does not meet the requirements;

[0079] The reliability coefficient of the reliable output combiner box at the output power is determined by the average value of the discharge reliability coefficients of different corresponding battery packs.

[0080] S3 takes the energy storage regulation power of the energy storage system as a constraint condition, uses the output power range of the reliable output combiner box to determine the regulation scheme of the energy storage system, and determines the optimal regulation scheme through the number of reliable output combiner boxes in different regulation schemes and the output power ranges of different reliable output combiner boxes;

[0081] Specifically, it should be noted that the method for determining the adjustment scheme is:

[0082] The reliable output combiner boxes are combined to generate multiple combiner box combinations, and a regulation scheme for the energy storage system is generated based on the combiner box combinations, with the energy storage regulation power of the energy storage system being within the output power range of the combiner box combinations as a constraint.

[0083] Specifically, Figure 4 As shown, the method for determining the optimal adjustment scheme is:

[0084] Based on the number of reliable output combiner boxes in different regulation schemes, the regulation complexity of different regulation schemes is determined;

[0085] Based on the energy storage regulation power of the energy storage system, the output regulation power of different reliable output combiner boxes is determined according to equal power distribution, and the regulation reliability of different reliable output combiner boxes is determined according to the output regulation power of different reliable output combiner boxes and the endpoint deviation of the output power range of the reliable output combiner boxes;

[0086] The comprehensive regulation reliability of the regulation scheme is determined by the regulation reliability of different reliable output combiner boxes, and the scheme adaptation coefficient of the regulation scheme is determined in combination with the regulation complexity of the regulation scheme. The scheme adaptation coefficient is used to determine the optimal regulation scheme among the regulation schemes.

[0087] Furthermore, the optimal adjustment scheme is the adjustment scheme with the largest scheme adaptation coefficient.

[0088] It can be understood that the regulation complexity of the regulation scheme is determined according to the ratio of the number of reliable output combiner boxes to the number of preset combiner boxes in the regulation scheme.

[0089] It should also be noted that the method for determining the optimal adjustment scheme is:

[0090] Based on the energy storage regulation power of the energy storage system, the output regulation power of different reliable output combiner boxes is determined according to equal power distribution, and the regulation reliability of different reliable output combiner boxes is determined according to the output regulation power of different reliable output combiner boxes and the endpoint deviation of the output power range of the reliable output combiner boxes;

[0091] Determine the average value of the regulation reliability in the regulation scheme by using the regulation reliabilities of different reliable output combiner boxes, and use the ratio of the average value of the regulation reliability to the number of reliable output combiner boxes in the regulation scheme to calculate the scheme adaptation coefficient of the regulation scheme;

[0092] The scheme adaptation coefficient is used to determine the optimal adjustment scheme among the adjustment schemes.

[0093] In another embodiment, the method for determining the optimal adjustment solution is:

[0094] S31: obtaining the number of reliable output combiner boxes in the adjustment scheme, and determining whether the number of reliable output combiner boxes in the adjustment scheme is greater than the preset number of combiner boxes. If so, determining that the adjustment scheme is not an optimal adjustment scheme. If not, proceeding to the next step.

[0095] S32 determines the output regulation powers of different reliable output combiner boxes according to equal power distribution based on the energy storage regulation power of the energy storage system, determines the regulation reliability of different reliable output combiner boxes according to the output regulation powers of different reliable output combiner boxes and the endpoint deviations of the output power ranges of the reliable output combiner boxes, and determines whether there is a reliable output combiner box whose regulation reliability does not meet the requirements. If so, it is determined that the regulation scheme does not belong to the optimal regulation scheme. If not, proceed to the next step.

[0096] S33 determines whether the adjustment reliability of different reliable output combiner boxes is greater than the reliability limit threshold. If so, proceed to step S36; if not, proceed to the next step;

[0097] S34 determines whether the average values ​​of the regulation reliability of different reliable output combiner boxes meet the requirements, if yes, proceeds to the next step, if no, determines that the regulation scheme does not belong to the optimal regulation scheme;

[0098] S35: taking a reliable output combiner box whose adjustment reliability is less than a reliability limit threshold as a suspected unreliable combiner box, and judging whether the number of suspected unreliable combiner boxes in the adjustment scheme meets the requirement, if so, proceeding to the next step, if not, determining that the adjustment scheme does not belong to the optimal adjustment scheme;

[0099] S36 determines the regulation complexity of different regulation schemes based on the number of reliable output junction boxes in different regulation schemes, determines the comprehensive regulation reliability of the regulation scheme through the regulation reliability of different reliable output junction boxes, determines the scheme adaptation coefficient of the regulation scheme in combination with the regulation complexity of the regulation scheme, and determines the optimal regulation scheme among the regulation schemes using the scheme adaptation coefficient.

[0100] S4 uses the optimal adjustment scheme to adjust the output of the energy storage system, and determines the output power of different reliable output combiner boxes based on the remaining capacity of the corresponding battery pack after the output and the reliability coefficient at different output powers.

[0101] Furthermore, the method for determining the output power of the reliable output combiner box is:

[0102] Determine the energy storage regulation duration of the energy storage system according to the energy storage regulation demand of the energy storage system, and generate multiple output power regulation schemes according to the energy storage regulation power of the energy storage system and the output power range of the reliable output combiner box;

[0103] Obtaining output powers of different reliable output combiner boxes in different output power adjustment schemes, and determining power adaptation coefficients of different reliable output combiner boxes by reliability coefficients under the output powers and the remaining capacities of corresponding battery packs after output;

[0104] The comprehensive adaptation coefficient of the energy storage power regulation scheme is determined according to the power adaptation coefficients of different reliable output combiner boxes, and the output power of different reliable output combiner boxes is determined by using the comprehensive adaptation coefficient.

[0105] Embodiment 2 In the second aspect, as Figure 5 As shown, the present invention provides a computer system, comprising: a memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that: when the processor runs the computer program, the above-mentioned power control method for an energy storage system is executed.

[0106] The above-mentioned power control method for an energy storage system specifically includes:

[0107] Determine the battery packs connected to different combiner boxes in the energy storage system and use them as corresponding battery packs, determine the working reliability of different combiner boxes according to the remaining capacity and historical discharge curves of different corresponding battery packs, and determine the reliable output combiner box among the combiner boxes using the working reliability;

[0108] Based on the remaining capacity and historical discharge curves of the corresponding battery packs of different reliable output combiner boxes, the reliability coefficients of the reliable output combiner boxes at different output powers are determined, and the output power ranges of the different reliable output combiner boxes are determined using the reliability coefficients;

[0109] Taking the energy storage regulation power of the energy storage system as a constraint condition, using the output power range of the reliable output combiner box to determine the regulation scheme of the energy storage system, based on the energy storage regulation power of the energy storage system, determining the output regulation powers of different reliable output combiner boxes according to equal power distribution, and determining the regulation reliability of different reliable output combiner boxes according to the output regulation powers of different reliable output combiner boxes and the endpoint deviations of the output power range of the reliable output combiner box;

[0110] Determine the average value of the regulation reliability in the regulation scheme by using the regulation reliabilities of different reliable output combiner boxes, and use the ratio of the average value of the regulation reliability to the number of reliable output combiner boxes in the regulation scheme to determine the scheme adaptation coefficient of the regulation scheme, and use the scheme adaptation coefficient to determine the optimal regulation scheme in the regulation scheme;

[0111] The optimal adjustment scheme is used to adjust the output of the energy storage system, and the energy storage adjustment duration of the energy storage system is determined according to the energy storage adjustment demand of the energy storage system, and multiple output power adjustment schemes are generated according to the energy storage adjustment power of the energy storage system and the output power range of the reliable output combiner box;

[0112] Obtaining output powers of different reliable output combiner boxes in different output power adjustment schemes, and determining power adaptation coefficients of different reliable output combiner boxes by reliability coefficients under the output powers and the remaining capacities of corresponding battery packs after output;

[0113] The comprehensive adaptation coefficient of the energy storage power regulation scheme is determined according to the power adaptation coefficients of different reliable output combiner boxes, and the output power of different reliable output combiner boxes is determined by using the comprehensive adaptation coefficient.

[0114] Based on the above embodiments, the present invention achieves the following beneficial effects:

[0115] 1. In the present invention, a reliable output combiner box in the combiner box is determined according to the remaining capacity and historical discharge curves of different corresponding battery packs, thereby achieving a comprehensive consideration of the influence of the remaining capacity of the battery pack on the discharge efficiency, avoiding the influence of insufficient remaining capacity on the reliability of the output power of the combiner box, and also laying a foundation for using a reliable output combiner box to perform energy storage regulation of the energy storage system, improving the reliability of energy storage regulation, and avoiding the influence of sudden changes in output power on the reliability of energy storage regulation of the energy storage system.

[0116] 2. In the present invention, the output powers of different reliable output combiner boxes are determined based on the remaining capacity of the corresponding battery packs after output and the reliability coefficients at different output powers. On the basis of satisfying the reliability of energy storage regulation of the energy storage system, the energy storage regulation of the energy storage system is made more reliable by considering the reliability coefficient. At the same time, by further considering the remaining capacity of the corresponding battery packs after output, the regulation potential of the energy storage system after energy storage regulation is comprehensively guaranteed, thereby ensuring the reliability and stability of the operation of the energy storage system.

[0117] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device, equipment, and non-volatile computer storage medium embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0118] The above is a description of a specific embodiment of the specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0119] The above description is only one or more embodiments of this specification and is not intended to limit this specification. For those skilled in the art, one or more embodiments of this specification may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of one or more embodiments of this specification shall be included in the scope of the claims of this specification.

Claims

1. A power control method for an energy storage system, characterized in that: Specifically include: Determine the battery packs connected to different combiner boxes in the energy storage system and use them as corresponding battery packs, determine the working reliability of different combiner boxes according to the remaining capacity and historical discharge curves of different corresponding battery packs, and determine the reliable output combiner box among the combiner boxes using the working reliability; Based on the remaining capacity and historical discharge curves of the corresponding battery packs of different reliable output combiner boxes, the reliability coefficients of the reliable output combiner boxes at different output powers are determined, and the output power ranges of the different reliable output combiner boxes are determined using the reliability coefficients; Taking the energy storage regulation power of the energy storage system as a constraint condition, determining the regulation scheme of the energy storage system by using the output power range of the reliable output combiner box, and determining the optimal regulation scheme by the number of reliable output combiner boxes in different regulation schemes and the output power ranges of different reliable output combiner boxes; The optimal adjustment scheme is used to adjust the output of the energy storage system, and the output power of different reliable output combiner boxes is determined based on the remaining capacity of the corresponding battery pack after the output of different reliable output combiner boxes and the reliability coefficients at different output powers; The method for determining the working reliability of the combiner box is: Determine a historical discharge curve within different discharge depth intervals according to the remaining capacity of the corresponding battery pack, and determine a change in output power within different discharge depth intervals according to the historical discharge curve; Determine the discharge depth interval in which the output power variation does not meet the requirement by using the output power variation, and use it as the power variation interval, and determine the output reliability of different corresponding battery packs according to the number of the power variation intervals; Determining the working reliability of the combiner box based on the output reliability of different corresponding battery packs; The method for determining the reliability coefficient is: Determine the output power of different corresponding battery packs under the output power according to the output power of the reliable output combiner box, and determine the maximum stable discharge time under the remaining capacity of the corresponding battery pack based on the output power and the historical discharge curve; Determining discharge reliability coefficients of different corresponding battery packs based on the maximum stable discharge time; The reliability coefficient of the reliable output combiner box at the output power is determined by the average value of the discharge reliability coefficients of different corresponding battery packs.

2. The power control method for an energy storage system according to claim 1, characterized in that: The battery pack connected to the combiner box is determined according to the corresponding connection relationship between the battery pack and the combiner box.

3. The power control method for an energy storage system according to claim 1, characterized in that: The remaining capacity of the corresponding battery pack is determined based on the monitoring data of the battery pack.

4. The power control method for an energy storage system according to claim 1, characterized in that: The working reliability of the combiner box has a value range of 0 to 1, wherein when the working reliability of the combiner box is greater than a preset reliability threshold, the combiner box is determined to be a reliable output combiner box.

5. The power control method for an energy storage system according to claim 1, characterized in that: The output power range of the reliable output combiner box is determined according to the range of output power that the reliability coefficient of the reliable output combiner box meets the requirements.

6. The power control method for an energy storage system according to claim 1, characterized in that: The method for determining the adjustment scheme is: The reliable output combiner boxes are combined to generate multiple combiner box combinations, and a regulation scheme for the energy storage system is generated based on the combiner box combinations, with the energy storage regulation power of the energy storage system being within the output power range of the combiner box combinations as a constraint.

7. The power control method for an energy storage system according to claim 1, characterized in that: The method for determining the optimal adjustment scheme is: Based on the energy storage regulation power of the energy storage system, the output regulation power of different reliable output combiner boxes is determined according to equal power distribution, and the regulation reliability of different reliable output combiner boxes is determined according to the output regulation power of different reliable output combiner boxes and the endpoint deviation of the output power range of the reliable output combiner boxes; Determine the average value of the regulation reliability in the regulation scheme by using the regulation reliabilities of different reliable output combiner boxes, and use the ratio of the average value of the regulation reliability to the number of reliable output combiner boxes in the regulation scheme to calculate the scheme adaptation coefficient of the regulation scheme; The scheme adaptation coefficient is used to determine the optimal adjustment scheme among the adjustment schemes.

8. A computer system comprising: A memory and a processor connected in communication, and a computer program stored in the memory and capable of running on the processor, characterized in that: when the processor runs the computer program, a power control method for an energy storage system as described in any one of claims 1-7 is executed.

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