Joint control method and system for anti-flow and capacity protection of energy storage system

Abstract

The application provides a joint control method and system for anti-flow and capacity protection of an energy storage system, relates to the field of electric power energy storage, and comprises the following steps: collecting electric power system power consumption data information; in the case that the state of charge (SOC) is in a target interval, determining whether grid-connected power changes within a preset interval period; in the case that the grid-connected power changes within the preset interval period, jointly analyzing the grid-connected power and the state of charge (SOC) based on a capacity protection threshold and an anti-flow threshold, and generating an adjustment instruction to adjust the energy storage power of the electric power system. The application generates corresponding adjustment instructions through joint discriminant analysis based on the preset capacity protection threshold and the preset anti-flow threshold, simultaneously considering two angles of the grid-connected power and the state of charge (SOC), logically judges according to real-time data, and accurately controls the anti-flow and capacity protection operations, so that the overall operation efficiency and stability of the electric power system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power energy storage, in particular to a joint control method and system for anti-flow and capacity protection of energy storage system. BACKGROUND

[0002] The power grid needs to match the power generation and consumption, and the power generation and consumption will change over time. The balance of energy storage and demand response of the energy storage system is crucial. Power energy storage technology is one of the key technologies to solve the imbalance between supply and demand of the power grid, improve the stability and reliability of the power grid, and is becoming more and more important with the large-scale grid connection of renewable energy and the development of smart grid. In practical application, the energy storage system often has reverse flow, which is harmful to the capacity and stable operation of the energy storage system. Reverse flow refers to the phenomenon that when the output power of the new energy power generation system is greater than the user's electricity demand, the excess electric energy will flow back to the power grid, which may lead to instability or even collapse of the power grid system.

[0003] In related technologies, the power system usually uses fixed threshold or preset conditions to trigger the anti-flow and capacity protection mechanism. Although these methods are simple and direct, they often have problems such as delayed response, high misjudgment rate, etc. when facing complex and variable power system operation. For example, in the process of preventing reverse flow by monitoring real-time grid-connected power and energy storage power parameters, when the grid-connected power exceeds the set threshold, the energy storage power is directly adjusted. However, this method may cause the system to fail to correctly judge the current state when the grid-connected power data is constant or missing for a long time, resulting in misoperation. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides a joint control method and system for anti-flow and capacity protection of energy storage system, which solves the problem that the power system focuses on single target of anti-flow or capacity protection, and is difficult to realize overall system performance optimization.

[0005] To achieve the above purpose, the present application is realized by the following technical scheme:

[0006] In a first aspect, an embodiment of the present application provides a joint control method for anti-flow and capacity protection of an energy storage system. The joint control method comprises: collecting power consumption data information of a power system based on a preset interval time, the power consumption data information including a state of charge (SOC), grid-connected power and energy storage power; determining whether the SOC is in a target interval between a preset discharging cutoff threshold and a preset charging cutoff threshold; in a case where the SOC is in the target interval, determining whether the grid-connected power changes in a preset interval period; in a case where the grid-connected power changes in the preset interval period, performing joint discriminant analysis on the grid-connected power and the SOC based on a preset capacity protection threshold and a preset anti-flow threshold, and generating a corresponding adjustment instruction; and adjusting the energy storage power of the power system based on the adjustment instruction to perform anti-flow and capacity protection on the power system.

[0007] According to the first aspect of the embodiment of the present application, in a case where the grid-connected power changes in the preset interval period, the joint discriminant analysis on the grid-connected power and the SOC based on the preset capacity protection threshold and the preset anti-flow threshold, and the generation of the corresponding adjustment instruction, comprise: in a case where an absolute value of the grid-connected power is greater than the preset capacity protection threshold and the grid-connected power is greater than or equal to the preset anti-flow threshold, calculating a first energy storage adjustment power based on the grid-connected power and the capacity protection threshold; determining a sum of the first energy storage adjustment power and the energy storage power as an operating power; calculating a target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold; and generating a corresponding adjustment instruction according to the target operating power, the adjustment instruction being used to control adjustment of the energy storage power of the power system in a current stage.

[0008] According to the first aspect of the embodiment of the present application, before the calculation of the target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, the joint control method for anti-flow and capacity protection of the energy storage system further comprises: in a case where the grid-connected power is less than the anti-flow threshold, calculating a difference between the grid-connected power and the anti-flow threshold to obtain a second energy storage adjustment power; and determining a sum of the second energy storage adjustment power and the energy storage power as the operating power.

[0009] According to the first aspect of the embodiment of the present application, the calculation of the target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold comprises: in a case where the operating power is negative, determining whether the SOC is less than the charging cutoff threshold; in a case where the SOC is less than the charging cutoff threshold, determining whether a preset charging rated power threshold is less than or equal to the operating power; in a case where the charging rated power threshold is greater than the operating power, determining that the charging rated power threshold is the target operating power; and in a case where the charging rated power threshold is less than or equal to the operating power, determining that the operating power is the target operating power.

[0010] According to a first aspect of the embodiments of the present application, the foregoing calculating the target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold further comprises: in the case that the operating power is positive, judging whether the state of charge SOC is greater than the discharging cutoff threshold; in the case that the state of charge SOC is greater than the discharging cutoff threshold, judging whether the operating power is less than or equal to a preset discharging rated power threshold; in the case that the operating power is greater than the discharging rated power threshold, determining the discharging rated power threshold as the target operating power; in the case that the operating power is less than or equal to the discharging rated power threshold, determining the operating power as the target operating power.

[0011] According to the first aspect of the embodiments of the present application, in the case that the absolute value of the foregoing grid-connected power is greater than a preset capacity protection threshold, and the grid-connected power is greater than or equal to a preset anti-reverse flow threshold, the foregoing calculating the first energy storage adjustment power based on the grid-connected power and the capacity protection threshold comprises: judging the positive and negative of the grid-connected power; in the case that the grid-connected power is positive, calculating the difference between the grid-connected power and the capacity protection threshold to obtain the first energy storage adjustment power; in the case that the grid-connected power is negative, determining the difference between the negative value of the grid-connected power and the capacity protection threshold as the first energy storage adjustment power.

[0012] According to the first aspect of the embodiments of the present application, the foregoing joint control method for anti-reverse flow and capacity protection of the energy storage system further comprises: under a target condition, adjusting the energy storage power to 0 to stop the charging and discharging operation of the energy storage device; the target condition comprises: the grid-connected power does not change within a preset interval period, the state of charge SOC is greater than or equal to the charging cutoff threshold, and the state of charge SOC is less than or equal to the discharging cutoff threshold.

[0013] According to the first aspect of the embodiments of the present application, the foregoing joint control method for anti-reverse flow and capacity protection of the energy storage system further comprises: under a target condition, adjusting the energy storage power to 0 to stop the charging and discharging operation of the energy storage device; the target condition comprises: the grid-connected power does not change within a preset interval period, the state of charge SOC is greater than or equal to the charging cutoff threshold, and the state of charge SOC is less than or equal to the discharging cutoff threshold.

[0014] In a third aspect, an electronic device is provided, which comprises a processor, a memory, and a program stored in the memory and capable of running on the processor, and the program, when executed by the processor, implements the joint control method for anti-reverse flow and capacity protection of the energy storage system according to the first aspect.

[0015] In a fourth aspect, a computer readable storage medium is provided, which stores a program or instructions, and the program or instructions, when executed by a processor, implements the joint control method for anti-reverse flow and capacity protection of the energy storage system according to the first aspect.

[0016] The present application provides a joint control method and system for anti-reverse flow and capacity protection of an energy storage system. Compared with the prior art, the present application has the following beneficial effects:

[0017] The present application collects the state of charge (SOC) of the power system, the grid-connected power and the energy storage power at intervals in real time to monitor the power system. When the state of charge (SOC) is between the discharge cutoff threshold and the charge cutoff threshold, the anti-reverse flow and capacity protection are performed by regulating the energy storage power. The present application generates corresponding adjustment instructions by performing joint discriminant analysis based on the preset capacity protection threshold and the preset anti-reverse flow threshold, considering the grid-connected power and the state of charge (SOC) from two angles. The present application comprehensively considers the dual goals of anti-reverse flow and capacity protection to optimize the overall performance of the power system. According to the real-time data, logical judgment can be made to adapt to the needs of different power systems. By accurately controlling the anti-reverse flow and capacity protection operations, the present application can avoid unnecessary energy waste and equipment damage, and improve the overall operation efficiency and stability of the power system. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0019] Figure 1 is a flowchart of a joint control method for anti-reverse flow and capacity protection of an energy storage system provided by the present application;

[0020] Figure 2 is Figure 1 is an exemplary flowchart of S120 in the method;

[0021] Figure 3 is Figure 2 is an exemplary flowchart of S230 in the method;

[0022] Figure 4 is Figure 2 Another exemplary flowchart of S230 in the method is shown in FIG. 2B.

[0023] Figure 5 FIG. 1 is a structural diagram of a joint control system for anti-reverse flow and capacity protection of an energy storage system according to an embodiment of the present application.

[0024] Figure 6 FIG. 1 is a structural diagram of a joint control system for anti-reverse flow and capacity protection of an energy storage system according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application are described clearly and completely. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] It should be noted that, in this document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element preceded by "comprises... a" does not, without more constraints, foreclose the existence of additional identical elements in the process, method, article, or apparatus that comprises the stated elements.

[0027] The embodiments of the present application provide a joint control method and system for anti-reverse flow and capacity protection of an energy storage system, which solves the problem that the power system focuses on a single target of anti-reverse flow or capacity protection, and it is difficult to achieve the optimization of the overall performance of the system.

[0028] The technical solutions in the embodiments of the present application have the following general ideas to solve the above technical problems:

[0029] The power grid needs to match the power generation and consumption, and the power generation and consumption will change over time. The balance of energy storage and demand response of the energy storage system is crucial; power storage technology is one of the key technologies to solve the imbalance between supply and demand of the power grid, improve the stability and reliability of the power grid, and with the large-scale grid connection of renewable energy and the development of smart grid, power storage technology is becoming more and more important. In actual application, the energy storage system often has reverse flow, which is not conducive to the capacity and stable operation of the energy storage system. Reverse flow refers to when the output power of the new energy power generation system is greater than the user's power demand, the excess power will flow back to the power grid, which may cause the power grid system to be unstable or even collapse.

[0030] In related technologies, the power system usually uses fixed thresholds or preset conditions to trigger the anti-reverse flow and capacity protection mechanism. Although these methods are simple and direct, they often have problems such as delayed response, high misjudgment rate, etc. when facing complex and variable power system operation. For example, in the process of preventing reverse flow by monitoring real-time grid-connected power and energy storage power parameters, when the grid-connected power exceeds the set threshold, the energy storage power is directly adjusted. However, this method may cause the system to fail to correctly determine the current state when the grid-connected power data is constant or missing for a long time, resulting in misoperation.

[0031] In order to better understand the above technical solutions, the above technical solutions will be described in detail in conjunction with the drawings in the specification and specific embodiments.

[0032] First, a joint control method for energy storage system anti-reverse flow and capacity protection provided by the embodiments of the present application will be introduced.

[0033] The flowchart of the joint control method for energy storage system anti-reverse flow and capacity protection provided by the embodiments of the present application is shown in Figure 1 The joint control method can include the following steps S110-S150.

[0034] S110, based on the preset interval time, collect the power consumption data information of the power system, and the power consumption data information includes the state of charge SOC, grid-connected power and energy storage power.

[0035] S120, judge whether the state of charge SOC is in the target interval between the preset discharge cutoff threshold and the preset charge cutoff threshold.

[0036] S130, in the case that the state of charge SOC is in the target interval, judge whether the grid-connected power changes within the preset interval period.

[0037] S140, in the case that the grid-connected power changes in the preset interval period, jointly discriminates the grid-connected power and the state of charge SOC based on the preset capacity protection threshold and the preset anti-flow threshold, and generates a corresponding adjustment instruction.

[0038] S150, based on the adjustment instruction, adjusting the energy storage power of the power system to prevent reverse flow and capacity protection of the power system.

[0039] In the embodiments of the present application, the state of charge SOC, the grid-connected power and the energy storage power of the power system are collected in real time, so that the power system can be monitored. When the state of charge SOC is between the discharge cutoff threshold and the charge cutoff threshold, the energy storage power is regulated to prevent reverse flow and capacity protection. It can be understood that the present application considers whether the grid-connected power changes in the preset interval to adjust the power system at regular intervals.

[0040] It should be noted that the present application considers both the grid-connected power and the state of charge SOC based on the preset capacity protection threshold and the preset anti-flow threshold, and generates a corresponding adjustment instruction by joint discriminant analysis. The present application can adapt to the needs of different power systems by logical judgment based on real-time data. By accurately controlling the anti-flow and capacity protection operations, the present application can avoid unnecessary energy waste and equipment damage, improve the overall operation efficiency and stability of the power system. By combining logical judgment and data monitoring, the system can more accurately determine the state of the power system and make corresponding adjustments.

[0041] In one example, the preset interval time can be 60 seconds, and it is checked whether real-time data about the state of charge SOC, the grid-connected power and the energy storage power has been received in the past 60 seconds, which is a prerequisite for starting other logical discrimination programs of the present application.

[0042] In one example, the preset interval period can be 15 minutes, and whether the grid-connected power changes in the last 15 minutes is monitored, which is used to determine the subsequent operation logic.

[0043] In one example, the aforementioned preset capacity protection threshold can be 400kw, and the preset anti-flow threshold can be -30kW. The anti-flow threshold is set to prevent power from flowing back to the power system and ensure the stability of the power system.

[0044] In some embodiments, as shown in Figure 2 The aforementioned in the case that the grid-connected power changes in the preset interval period, jointly discriminates the grid-connected power and the state of charge SOC based on the preset capacity protection threshold and the preset anti-flow threshold, and generates a corresponding adjustment instruction, that is, S140 can specifically include the following steps:

[0045] S210, in a case that the absolute value of the grid-connected power is greater than the preset capacity protection threshold and the grid-connected power is greater than or equal to the preset anti-reverse flow threshold, calculating a first energy storage adjustment power based on the grid-connected power and the capacity protection threshold.

[0046] S220, determining that a sum of the first energy storage adjustment power and the energy storage power is the operating power.

[0047] S230, calculating a target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold.

[0048] S240, generating a corresponding adjustment instruction according to the target operating power, the adjustment instruction being used to control the energy storage power of the adjustment power system in the current stage.

[0049] In the embodiments of the present application, it can be understood that, in a case that the grid-connected power is greater than or equal to the preset anti-reverse flow threshold, the anti-reverse flow threshold does not need to be considered to guide the determination of the operating power, and only one aspect of the grid-connected power and the capacity protection threshold needs to be considered. After the operating power is determined, the obtained operating power is further logically analyzed and processed based on the charging cutoff threshold and the discharging cutoff threshold to obtain the target operating power to guide the adjustment of the energy storage power of the power system.

[0050] In some embodiments, before the aforementioned calculation of the target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, that is, before the aforementioned S230, the joint control method for the energy storage system anti-reverse flow and capacity protection provided by the present application can further include the following steps:

[0051] S221, in a case that the grid-connected power is less than the anti-reverse flow threshold, calculating a difference between the grid-connected power and the anti-reverse flow threshold to obtain a second energy storage adjustment power.

[0052] S222, determining that a sum of the second energy storage adjustment power and the energy storage power is the operating power.

[0053] In the embodiments of the present application, it can be understood that, in a case that the grid-connected power is less than the anti-reverse flow threshold, the anti-reverse flow threshold needs to be considered to guide the determination of the operating power, and since the first energy storage adjustment power determined based on the capacity protection threshold is usually much smaller than the second energy storage adjustment power determined based on the anti-reverse flow threshold. Based on this, when the operating power is calculated in a case that the grid-connected power is less than the anti-reverse flow threshold, only the second energy storage adjustment power and the energy storage power are considered, and the aforementioned first energy storage adjustment power does not need to be considered.

[0054] In some embodiments, as shown in Figure 3 the aforementioned calculation of the target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, that is, the aforementioned S230 can specifically include the following steps:

[0055] S310, in a case where the running power is a negative value, determining whether the state of charge SOC is less than a charging cut-off threshold.

[0056] S320, in a case where the state of charge SOC is less than the charging cut-off threshold, determining whether a preset charging rated power threshold is less than or equal to the running power.

[0057] S330, in a case where the charging rated power threshold is greater than the running power, determining that the charging rated power threshold is the target running power.

[0058] S340, in a case where the charging rated power threshold is less than or equal to the running power, determining that the running power is the target running power.

[0059] In the embodiments of the present application, it can be understood that the present application generates an adjustment instruction based on the target running power to control the adjustment power system to adjust the energy storage power in the current stage. When determining the target running power, when the running power is a negative value, the greater one between the foregoing charging rated power threshold and the foregoing running power is selected as the target running power.

[0060] It should be noted that the joint control method provided by the present application checks whether the real-time state of charge SOC is less than the set charging cut-off threshold, which determines whether the power system is allowed to charge.

[0061] In one example, the charging cut-off threshold can be 100%.

[0062] In some embodiments, as shown in Figure 4 based on the running power, the charging cut-off threshold and the discharging cut-off threshold, the target running power is calculated, that is, the foregoing S230 can further include the following steps:

[0063] S410, in a case where the running power is a positive value, determining whether the state of charge SOC is greater than a discharging cut-off threshold.

[0064] S420, in a case where the state of charge SOC is greater than the discharging cut-off threshold, determining whether the running power is less than or equal to a preset discharging rated power threshold.

[0065] S430, in a case where the running power is greater than the discharging rated power threshold, determining that the discharging rated power threshold is the target running power.

[0066] S440, in a case where the running power is less than or equal to the discharging rated power threshold, determining that the running power is the target running power.

[0067] In the embodiments of the present application, it can be understood that the positive and negative values of the running power correspond to different operation logics. When the running power is positive, the smaller one between the foregoing charging rated power threshold and the foregoing running power is selected as the target running power to ensure the safety of the power system.

[0068] It should be noted that the joint control method provided in the present application checks whether the real-time state of charge SOC is greater than the set discharge cutoff threshold, which determines whether the power system is allowed to discharge.

[0069] In one example, the discharge cutoff threshold can be 10%, and in the case that the state of charge SOC is lower than 10%, the control stops the discharge of the power system to perform forced power preservation.

[0070] In some embodiments, in the case that the absolute value of the grid-connected power is greater than the preset capacity protection threshold, and the grid-connected power is greater than or equal to the preset anti-backflow threshold, the first energy storage adjustment power is calculated based on the grid-connected power and the capacity protection threshold, that is, the foregoing S210 can specifically include the following steps:

[0071] S211, judging the positive and negative of the grid-connected power.

[0072] S212, in the case that the grid-connected power is positive, calculating the difference between the grid-connected power and the capacity protection threshold to obtain the first energy storage adjustment power.

[0073] S213, in the case that the grid-connected power is negative, determining the difference between the negative value of the grid-connected power and the capacity protection threshold as the first energy storage adjustment power.

[0074] In the embodiments of the present application, it can be understood that the first energy storage adjustment power is determined based on the difference between the grid-connected power and the capacity protection threshold, and the different positive and negative values of the grid-connected power correspond to different specific processing methods.

[0075] In one example, the foregoing joint control method for the energy storage system anti-backflow and capacity protection further includes: performing 0 adjustment on the energy storage power under a target condition to stop the charging and discharging operation of the energy storage device; the target condition includes that the grid-connected power does not change within a preset interval period, the state of charge SOC is greater than or equal to the charging cutoff threshold, and the state of charge SOC is less than or equal to the discharge cutoff threshold.

[0076] In some embodiments, the foregoing combined control method for anti-inrush and capacity protection of the energy storage system can further include: in the case that the absolute value of the grid-connected power is less than or equal to the capacity protection threshold, determining whether the current time is the whole point of the preset interval period, and in the case that the current time is not the whole point of the preset interval period, not adjusting the current energy storage power; in the case that the grid-connected power is greater than or equal to the anti-inrush threshold, determining whether the current time is the whole point of the preset interval period; and in the case that the current time is not the whole point of the preset interval period, not adjusting the current energy storage power.

[0077] It can be understood that, whether the energy storage power of the power system is adjusted based on the capacity protection threshold or the anti-inrush threshold, the present application is based on the preset interval period, and the time for adjusting the energy storage power is the whole point of the corresponding preset interval period.

[0078] In some embodiments, the combined control method for anti-inrush and capacity protection of the energy storage system provided by the present application can be applied to a commercial-scale photovoltaic energy storage integrated project. The intelligent anti-inrush and dynamic capacity protection strategy in the present application can be integrated into system management software. For example, a photovoltaic energy storage integrated project can be configured with a 1 mw photovoltaic array and a 500 kWh energy storage battery pack to provide stable power supply to the local community.

[0079] For example, in a typical spring afternoon, due to cloud cover, the photovoltaic output drops sharply, resulting in real-time data changes. Through the response of the anti-inrush strategy, the discharge amount of the energy storage battery can be reduced, and the situation of power flowing back to the grid can be avoided.

[0080] For example, during the summer high-temperature period, the energy storage battery faces the risk of capacity degradation under high-temperature environment. Based on the dynamic capacity protection strategy and the current state of charge SOC level provided by the present application, the charging and discharging strategy can be automatically adjusted to avoid full-power charging and discharging when the battery temperature is higher than 45℃, effectively protecting the battery health. Based on the dynamic capacity protection strategy, even in continuous high-temperature weather for several days, the maximum temperature of the battery will not exceed the design upper limit, which can significantly prolong the service life of the battery.

[0081] Based on this, the combined control method for anti-inrush and capacity protection of the energy storage system provided by the present application not only realizes efficient management of the photovoltaic energy storage system at the technical level, but also exhibits good benefits in practical application, providing strong support for the sustainable development of renewable energy.

[0082] In some embodiments, please refer to Figure 5The application also provides a combined control system 500 for anti-flow and capacity protection of an energy storage system, which specifically can include the following modules:

[0083] The acquisition module 510 is configured to acquire power consumption data information of the power system based on a preset interval time, and the power consumption data information includes a state of charge (SOC), grid-connected power and energy storage power.

[0084] The judgment module 520 is configured to judge whether the state of charge (SOC) is in a target interval between a preset discharging cutoff threshold and a preset charging cutoff threshold.

[0085] The judgment module 520 is also configured to judge whether the grid-connected power changes in a preset interval period when the state of charge (SOC) is in the target interval.

[0086] The analysis module 530 is configured to perform combined discriminant analysis on the grid-connected power and the state of charge (SOC) based on a preset capacity protection threshold and a preset anti-flow threshold, and generate a corresponding adjustment instruction when the grid-connected power changes in the preset interval period.

[0087] The adjustment module 540 is configured to adjust the energy storage power of the power system based on the adjustment instruction to perform anti-flow and capacity protection on the power system.

[0088] According to the embodiments of the application, any multiple modules of the acquisition module 510, the judgment module 520, the analysis module 530 and the adjustment module 540 can be combined in one module, or any one of the modules can be split into multiple modules. Alternatively, at least part of the functions of one or more of the modules can be combined with at least part of the functions of other modules, and implemented in one module.

[0089] In some embodiments, the analysis module 530 can include the following units:

[0090] The first power calculation unit 531 is configured to calculate a first energy storage adjustment power based on the grid-connected power and the capacity protection threshold when the absolute value of the grid-connected power is greater than the preset capacity protection threshold and the grid-connected power is greater than or equal to the preset anti-flow threshold.

[0091] The first power determination unit 532 is configured to determine that the sum of the first energy storage adjustment power and the energy storage power is the operating power.

[0092] The second power calculation unit 533 is configured to calculate a target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold.

[0093] The instruction generation unit 534 is configured to generate a corresponding adjustment instruction according to the target operating power, the adjustment instruction being used to control the energy storage power of the adjustment power system in the current stage.

[0094] In some embodiments, the analysis module 530 can further include a second power determination unit 535, which can be specifically configured to:

[0095] In a case where the grid-connected power is less than the anti-inrush threshold, a difference between the grid-connected power and the anti-inrush threshold is calculated to obtain a second energy storage adjustment power;

[0096] The sum of the second energy storage adjustment power and the energy storage power is determined as the operating power.

[0097] In some embodiments, the aforementioned second power calculation unit 533 can be specifically configured to:

[0098] In a case where the operating power is negative, it is determined whether the state of charge SOC is less than a charging cutoff threshold;

[0099] In a case where the state of charge SOC is less than the charging cutoff threshold, it is determined whether a preset charging rated power threshold is less than or equal to the operating power;

[0100] In a case where the charging rated power threshold is greater than the operating power, the charging rated power threshold is determined as the target operating power;

[0101] In a case where the charging rated power threshold is less than or equal to the operating power, the operating power is determined as the target operating power.

[0102] In some embodiments, the aforementioned second power calculation unit 533 can be further configured to:

[0103] In a case where the operating power is positive, it is determined whether the state of charge SOC is greater than a discharging cutoff threshold;

[0104] In a case where the state of charge SOC is greater than the discharging cutoff threshold, it is determined whether the operating power is less than or equal to a preset discharging rated power threshold;

[0105] In a case where the operating power is greater than the discharging rated power threshold, the discharging rated power threshold is determined as the target operating power;

[0106] In a case where the operating power is less than or equal to the discharging rated power threshold, the operating power is determined as the target operating power.

[0107] In some embodiments, the aforementioned first power calculation unit 531 can be specifically configured to:

[0108] The grid-connected power is determined to be positive or negative;

[0109] In the case that the grid-connected power is a positive value, a difference between the grid-connected power and the capacity protection threshold is calculated to obtain the first energy storage adjustment power;

[0110] In the case that the grid-connected power is a negative value, a difference between the grid-connected power and a negative value of the capacity protection threshold is determined as the first energy storage adjustment power.

[0111] Figure 5 Each module in the device has the function of implementing each step in the foregoing joint control method for anti-flow and capacity protection of an energy storage system, and can achieve the corresponding technical effects. For brevity of description, no further description is given here.

[0112] In some embodiments, the present application provides an electronic device, a structural schematic diagram of which is shown in Figure 6

[0113] The electronic device can include a processor 610 and a memory 620 storing computer program instructions.

[0114] Specifically, the processor 610 described above can include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or can be configured as one or more integrated circuits that implement embodiments of the present application.

[0115] The memory 620 can include a mass storage for data or instructions. By way of example and not limitation, the memory 620 can include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. Where appropriate, the memory 620 can include removable or non-removable (or fixed) media. Where appropriate, the memory 620 can be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, the memory 620 is non-volatile solid-state memory.

[0116] The memory 620 can include read-only memory (ROM), random access memory (RAM), a disk storage medium device, an optical storage medium device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, generally, the memory 620 includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions that, when executed (e.g., by one or more processors), cause performance of any of the operations described above in connection with the joint control method for anti-flow and capacity protection of an energy storage system. ​

[0117] The processor 610 implements the energy storage system anti-flow and capacity protection oriented joint control method in any of the above embodiments by reading and executing computer program instructions stored in the memory 620.

[0118] In one example, the electronic device can further include a communication interface 630 and a bus 600. As shown, the processor 610, the memory 620, and the communication interface 630 are connected through the bus 600 and complete communication with each other. Figure 6

[0119] The communication interface 630 is mainly used to realize the communication between the modules, devices, units and / or equipment in the embodiments of the present application.

[0120] The bus 600 includes hardware, software or both to couple components of the online data traffic billing device to each other. By way of example, and not limitation, the bus can include an accelerated graphics port (AGP) or other graphics bus, an enhanced industry standard architecture (EISA) bus, a front-side bus (FSB), a HyperTransport (HT) interconnect, an industry standard architecture (ISA) bus, an infiniband interconnect, a low pin count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a peripheral component interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a serial advanced technology attachment (SATA) bus, a video electronics standards association local (VLB) bus, or another suitable bus or a combination of two or more of these. Where suitable, the bus 600 can include one or more buses. Although particular buses are described and shown in the embodiments of the present application, the present application contemplates any suitable bus or interconnect.

[0121] In addition, in combination with the energy storage system anti-flow and capacity protection oriented joint control method in the above embodiments, the embodiments of the present application can provide a computer storage medium to realize. The computer storage medium has computer program instructions stored thereon; the computer program instructions are executed by the processor to realize any of the energy storage system anti-flow and capacity protection oriented joint control methods in the above embodiments.

[0122] It should be clear that the present application is not limited to the specific configurations and processes described above and shown in the drawings. For the sake of brevity, detailed descriptions of well-known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present application is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after understanding the spirit of the present application.

[0123] ​The functional blocks shown in the structural block diagrams above can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application specific integrated circuits (ASICs), appropriate firmware, plug-ins, functional cards, and the like. When implemented in software, the elements of the present application are program or code segments that are used to perform the required tasks. The program or code segments can be stored in a machine-readable medium or transmitted through a data signal carried in a carrier wave over a transmission medium or communication link. A "machine-readable medium" includes any medium that can store or transport information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROMs, flash memories, erasable ROMs (EROMs), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, and the like. The code segments can be downloaded via computer networks such as the Internet, intranets, and the like.

[0124] It is also noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in an order different from the embodiments, or several steps can be performed simultaneously.

[0125] The computer program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other processing devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other processing devices to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks. These computer program instructions can also be stored in a computer readable medium that can direct a computer, other programmable data processing apparatus, or other processing devices to operate in a particular manner, such that the instructions stored in the computer readable medium produce an article of manufacture including instructions which implement the function / act specified in the flowchart and / or block diagram block or blocks.

[0126] In summary, compared with the prior art, the present application has the following beneficial effects:

[0127] 1. The application prevents reverse flow and capacity protection by regulating energy storage power, based on the preset capacity protection threshold and the preset reverse flow prevention threshold, considering both grid-connected power and state of charge (SOC), and generating corresponding adjustment instructions through joint discriminant analysis, which can balance reverse flow prevention, capacity protection and maximum charging and discharging capacity, achieve optimal decision-making, and optimize the overall performance of the power system.

[0128] 2. The application does not rely on fixed threshold judgment, but makes logical judgment based on real-time data, which can adapt to the needs of different power systems and increase the flexibility of the system; through accurate control of reverse flow prevention and capacity protection operation, unnecessary energy waste and equipment damage can be avoided, and the overall operation efficiency and stability of the power system can be improved.

[0129] 3. The application combines logical judgment and data monitoring, so that the system can more accurately judge the state of the power system and make corresponding adjustments.

[0130] The above examples are only used to illustrate the technical solutions of the application, but not to limit it; although the application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing examples, or make equivalent substitutions for some technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A method for combined control of anti-flow and capacity protection for energy storage system, characterized in that, The method comprises the following steps: acquiring power consumption data information of the power system based on a preset interval time, wherein the power consumption data information comprises a state of charge (SOC), grid-connected power and energy storage power; determining whether the state of charge (SOC) is in a target interval between a preset discharging cutoff threshold and a preset charging cutoff threshold; when the state of charge (SOC) is in the target interval, determining whether the grid-connected power changes in a preset interval period; when the grid-connected power changes in the preset interval period, jointly analyzing the grid-connected power and the state of charge (SOC) based on a preset capacity protection threshold and a preset anti-inrush threshold, and generating a corresponding adjustment instruction; adjusting the energy storage power of the power system based on the adjustment instruction to prevent anti-inrush and capacity protection of the power system; when the grid-connected power changes in the preset interval period, jointly analyzing the grid-connected power and the state of charge (SOC) based on a preset capacity protection threshold and a preset anti-inrush threshold, and generating a corresponding adjustment instruction, comprising: when the absolute value of the grid-connected power is greater than the preset capacity protection threshold, and the grid-connected power is greater than or equal to the preset anti-inrush threshold, calculating a first energy storage adjustment power based on the grid-connected power and the capacity protection threshold; determining that the sum of the first energy storage adjustment power and the energy storage power is an operating power; calculating a target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold; generating a corresponding adjustment instruction according to the target operating power, wherein the adjustment instruction is used to control the adjustment of the energy storage power of the power system in the current stage; before the step of calculating a target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, the joint control method for energy storage system anti-inrush and capacity protection further comprises: when the grid-connected power is less than the anti-inrush threshold, calculating a difference between the grid-connected power and the anti-inrush threshold to obtain a second energy storage adjustment power; determining that the sum of the second energy storage adjustment power and the energy storage power is an operating power; the step of calculating a target operating power based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, comprising: when the operating power is negative, determining whether the state of charge (SOC) is less than the charging cutoff threshold; when the state of charge (SOC) is less than the charging cutoff threshold, determining whether a preset charging rated power threshold is less than or equal to the operating power; when the charging rated power threshold is greater than the operating power, determining that the charging rated power threshold is a target operating power; when the charging rated power threshold is less than or equal to the operating power, determining that the operating power is a target operating power; when the operating power is positive, determining whether the state of charge (SOC) is greater than the discharging cutoff threshold; when the state of charge (SOC) is greater than the discharging cutoff threshold, determining whether the operating power is less than or equal to a preset discharging rated power threshold; In a case where the operating power is greater than the discharging rated power threshold, the discharging rated power threshold is determined as a target operating power; In a case where the operating power is less than or equal to the discharging rated power threshold, the operating power is determined as a target operating power; The joint control method for anti-reverse flow and capacity protection of the energy storage system further comprises: performing 0 adjustment on the energy storage power under a target condition to stop the charge-discharge operation of the energy storage device; the target condition includes that the grid-connected power does not change in the preset interval period, the state of charge SOC is greater than or equal to the charge cutoff threshold, and the state of charge SOC is less than or equal to the discharge cutoff threshold; In a case where the absolute value of the grid-connected power is less than or equal to the capacity protection threshold, it is judged whether the current time is the whole point of the preset interval period, and in a case where the current time is not the whole point of the preset interval period, the current energy storage power is not adjusted; in a case where the grid-connected power is greater than or equal to the anti-reverse flow threshold, it is judged whether the current time is the whole point of the preset interval period; in a case where the current time is not the whole point of the preset interval period, the current energy storage power is not adjusted; The joint control method for anti-reverse flow and capacity protection of the energy storage system is applied to a photovoltaic energy storage integrated project, and intelligent anti-reverse flow and dynamic capacity protection strategies are integrated into system management software; the photovoltaic energy storage integrated project is configured with a photovoltaic array and an energy storage battery pack.

2. The method for combined control against reverse flow and capacity protection for energy storage system according to claim 1, characterized in that, In a case where the absolute value of the grid-connected power is greater than a preset capacity protection threshold, and the grid-connected power is greater than or equal to a preset anti-reverse flow threshold, the first energy storage adjustment power is calculated based on the grid-connected power and the capacity protection threshold, comprising: judging the grid-connected power; in a case where the grid-connected power is positive, calculating the difference between the grid-connected power and the capacity protection threshold to obtain the first energy storage adjustment power; in a case where the grid-connected power is negative, determining the difference between the negative value of the grid-connected power and the capacity protection threshold as the first energy storage adjustment power.

3. A combined control system for anti- reverse flow and capacity protection of energy storage system, based on the combined control method for anti- reverse flow and capacity protection of energy storage system according to any one of claims 1-2, characterized in that, comprising: a collection module configured to collect power consumption data information of a power system based on a preset interval time, the power consumption data information including a state of charge SOC, a grid-connected power, and an energy storage power; a judgment module configured to judge whether the state of charge SOC is in a target interval between a preset discharging cutoff threshold and a preset charging cutoff threshold; the judgment module is further configured to, in a case where the state of charge SOC is in the target interval, judge whether the grid-connected power changes in a preset interval period; an analysis module configured to, in a case where the grid-connected power changes in the preset interval period, perform joint discriminant analysis on the grid-connected power and the state of charge SOC based on a preset capacity protection threshold and a preset anti-reverse flow threshold, and generate a corresponding adjustment instruction; an adjustment module configured to adjust the energy storage power of the power system based on the adjustment instruction to perform anti-reverse flow and capacity protection on the power system; In the case that the grid-connected power changes within the preset interval, the grid-connected power and the state of charge SOC are jointly analyzed based on the preset capacity protection threshold and the preset anti-backflow threshold, and a corresponding adjustment instruction is generated, including: In the case that the absolute value of the grid-connected power is greater than the preset capacity protection threshold, and the grid-connected power is greater than or equal to the preset anti-backflow threshold, a first energy storage adjustment power is calculated based on the grid-connected power and the capacity protection threshold; The sum of the first energy storage adjustment power and the energy storage power is determined as an operating power; A target operating power is calculated based on the operating power, the charging cutoff threshold and the discharging cutoff threshold; A corresponding adjustment instruction is generated according to the target operating power, which is used to control the adjustment power system to adjust the energy storage power in the current stage; Before the target operating power is calculated based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, the joint control method for energy storage system anti-backflow and capacity protection further includes: In the case that the grid-connected power is less than the anti-backflow threshold, a second energy storage adjustment power is calculated by calculating the difference between the grid-connected power and the anti-backflow threshold; The sum of the second energy storage adjustment power and the energy storage power is determined as an operating power; The target operating power is calculated based on the operating power, the charging cutoff threshold and the discharging cutoff threshold, including: In the case that the operating power is negative, it is determined whether the state of charge SOC is less than the charging cutoff threshold; In the case that the state of charge SOC is less than the charging cutoff threshold, it is determined whether a preset charging rated power threshold is less than or equal to the operating power; In the case that the charging rated power threshold is greater than the operating power, the charging rated power threshold is determined as the target operating power; In the case that the charging rated power threshold is less than or equal to the operating power, the operating power is determined as the target operating power.

4. An electronic device, comprising: including: A processor, a memory, and a program stored on the memory and executable on the processor, the program being executed by the processor to implement the joint control method for energy storage system anti-backflow and capacity protection according to any one of claims 1 to 2.

5. A computer-readable storage medium, characterized in that, The program or instructions are stored on the computer readable storage medium, and the program or instructions are executed by the processor to implement the joint control method for energy storage system anti-backflow and capacity protection according to any one of claims 1 to 2.

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