Energy storage countercurrent prevention method and system, electronic equipment and storage medium

Abstract

The invention discloses an energy storage countercurrent prevention method and system, electronic equipment and a storage medium. According to the scheme, a bus voltage value and a transformer output power value of energy storage equipment connected to a power grid are obtained; comparing the bus voltage value with a set voltage threshold value; when the bus voltage value is greater than or equal to a set voltage threshold value, adopting a high-voltage anti-countercurrent strategy, judging whether countercurrent occurs or not according to the obtained transformer output power value and a preset anti-countercurrent threshold value range, and executing high-voltage anti-countercurrent operation; when the bus voltage value is smaller than a set voltage threshold value, a low-voltage anti-countercurrent strategy is adopted, whether countercurrent occurs or not is judged according to the obtained transformer output power value and a preset anti-countercurrent threshold value range, and low-voltage anti-countercurrent operation is executed; the bus type is determined by detecting the bus voltage, the energy storage equipment is subjected to countercurrent prevention by matching the corresponding countercurrent prevention strategy, the access conditions of different energy storage equipment are compatible, and the countercurrent prevention effect is improved; the embodiment of the invention can be widely applied to the technical field of data processing.

Description

Technical Field

[0001] The present invention relates to the field of data processing technology, and in particular to an energy storage backflow prevention method, system, electronic equipment and storage medium. Background Art

[0002] Due to the differences in electricity usage characteristics of different industrial and commercial users and regional power construction, energy storage equipment poses a safety risk of causing backflow impacts to the power network. Therefore, energy storage equipment needs to be equipped with an energy management system for access control to achieve backflow prevention. However, in actual applications, multiple energy storage devices are connected to the same low-voltage busbar side. The existing backflow prevention access devices and strategies cannot fully absorb the backflow of electric energy, resulting in backflow and poor backflow prevention effect. The existing technology uses high-voltage backflow prevention devices to access the power grid, but it is not compatible with the existing low-voltage backflow prevention access strategy, resulting in poor backflow prevention effect. Summary of the Invention

[0003] The main purpose of the embodiments of the present invention is to provide an energy storage backflow prevention method, system, electronic device and storage medium, which can improve the backflow prevention effect.

[0004] To achieve the above objectives, an embodiment of the present invention provides a method for preventing backflow of stored energy, the method comprising:

[0005] Obtaining a bus voltage value and a current transformer output power value, and comparing the bus voltage value with a preset voltage threshold;

[0006] If the bus voltage value is greater than or equal to the preset voltage threshold, a high-voltage backflow prevention operation is performed according to the current transformer output power value and the preset backflow prevention threshold range;

[0007] If the bus voltage value is less than the preset voltage threshold, a low-voltage backflow prevention operation is performed according to the current transformer output power value and the preset backflow prevention threshold range.

[0008] In some embodiments, performing the high-voltage backflow prevention operation according to the current transformer output power value specifically includes:

[0009] Comparing the current transformer output power value with a preset anti-backflow threshold range;

[0010] If the current transformer output power value is greater than the upper limit of the preset anti-backflow threshold range, maintaining the current state of the energy management system;

[0011] If the current transformer output power value is within the preset anti-backflow threshold range, calculating the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range, and issuing an anti-backflow alarm according to the anti-backflow alarm level;

[0012] If the current transformer output power value is less than the lower limit of the preset anti-backflow threshold range, a power reduction instruction is generated according to a preset step size, and the power reduction instruction is sent to the energy management system.

[0013] In some embodiments, performing the low-voltage backflow prevention operation according to the current transformer output power value specifically includes:

[0014] Obtain a power value data set, and compare the current transformer output power value with a preset anti-backflow threshold range; wherein the power value data set includes the grid-connected transformer output power value, the first metering power value, and the second metering power value;

[0015] If the current transformer output power value is greater than the upper limit of the preset anti-backflow threshold range, maintaining the current state of the energy management system;

[0016] If the current transformer output power value is within the preset anti-backflow threshold range, calculating the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range, and issuing an anti-backflow alarm according to the anti-backflow alarm level;

[0017] If the current transformer output power value is less than the lower limit of the preset anti-backflow threshold range, calculation is performed based on the current transformer output power value and the power value data set to determine the adjustment threshold set, and a power reduction instruction is generated based on the adjustment threshold set and the preset step size, and the power reduction instruction is sent to the energy management system.

[0018] In some embodiments, performing calculations based on the current transformer output power value and the power value data set to determine the adjustment threshold set specifically includes:

[0019] Calculate the sum of the current transformer output power value and the first metered power in the power value data set as the first load power value; calculate the sum of the grid-connected power value in the power value data set and the second metered power value in the power value data set as the second load power value;

[0020] Calculating based on the first load power value, the second load power value, and the first load power value to determine a first parameter; and using the ratio of the current transformer output power value to the first parameter as a first adjustment threshold; calculating based on the first load power value, the second load power value, and the second load power value to determine a second parameter; and using the ratio of the grid-connected power value to the second parameter as a second adjustment threshold;

[0021] The adjustment threshold set is determined according to the first adjustment threshold and the second adjustment threshold.

[0022] In some embodiments, the method further comprises:

[0023] Obtaining the number of anti-backflow alarms within a preset time period, and comparing the number of anti-backflow alarms with a preset limit value;

[0024] If the number of anti-backflow alarms is less than or equal to the preset limit value, maintaining the preset anti-backflow threshold range;

[0025] If the number of anti-backflow alarms is greater than the preset limit value, the upper limit value and the lower limit value of the preset anti-backflow threshold range are adjusted according to the preset values.

[0026] In some embodiments, the method further comprises:

[0027] Determining a consecutive number of times based on the output power value of the power-adjusted transformer and the preset anti-backflow threshold range, and comparing the consecutive number of times with the preset threshold; wherein the consecutive number of times represents the consecutive number of times the output power value of the power-adjusted transformer is greater than the upper limit of the preset anti-backflow threshold range;

[0028] If the number of consecutive times is less than the preset threshold, the power reduction instruction is maintained, and a warning instruction for adjusting the anti-backflow threshold is issued;

[0029] If the number of consecutive times is greater than or equal to the preset threshold, the power reduction instruction is canceled and the preset backflow prevention threshold range is maintained.

[0030] In some embodiments, the calculating of the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range specifically includes:

[0031] Calculate the ratio of the current transformer output power value to the lower limit of the preset anti-backflow threshold range to determine the third parameter; calculate the ratio of the current transformer output power value to the upper limit of the preset anti-backflow threshold range to determine the fourth parameter;

[0032] The anti-backflow alarm level is determined according to the third parameter and the fourth parameter.

[0033] To achieve the above objectives, another aspect of an embodiment of the present invention provides an energy storage backflow prevention system, comprising a data acquisition module, a data processing module, and an interface module, wherein:

[0034] The data acquisition module is used to obtain the bus voltage value and the current transformer output power of the energy storage device, and send the bus voltage value and the current transformer output power to the data processing module;

[0035] The data processing module is used in any of the above methods;

[0036] The interface module is used to connect to the energy storage device.

[0037] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides an electronic device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the above-mentioned method when executing the computer program.

[0038] To achieve the above-mentioned purpose, another aspect of an embodiment of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method described above is implemented.

[0039] Implementation of the embodiments of the present invention includes the following beneficial effects: the embodiments of the present invention provide a method, system, electronic device, and storage medium for energy storage backflow prevention; the scheme obtains the bus voltage value and transformer output power value of the energy storage device connected to the power grid; compares the bus voltage value with a set voltage threshold; when the bus voltage value is greater than or equal to the set voltage threshold, adopts a high-voltage backflow prevention strategy, determines whether the energy storage device has backflow based on the obtained transformer output power value and a preset backflow prevention threshold range, and performs a high-voltage backflow prevention operation; when the bus voltage value is less than the set voltage threshold, adopts a low-voltage backflow prevention strategy, determines whether the energy storage device has backflow based on the obtained transformer output power value and a preset backflow prevention threshold range, and performs a low-voltage backflow prevention operation; determines the bus type by detecting the bus voltage, and then matches the corresponding backflow prevention strategy to perform backflow prevention processing on the energy storage device, is compatible with different energy storage device access conditions, and improves the backflow prevention effect; sets an backflow prevention threshold range to determine whether backflow occurs, prevents the energy storage device from repeatedly starting during dynamic fluctuations, and thereby improves the overall backflow prevention effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic flow chart of the steps of an energy storage backflow prevention method provided by an embodiment of the present invention;

[0041] Figure 2 This is a schematic flow chart of the steps for performing a high-pressure backflow prevention operation in an energy storage backflow prevention method provided by an embodiment of the present invention;

[0042] Figure 3 This is a schematic flow chart of the steps for performing a low-pressure backflow prevention operation in an energy storage backflow prevention method provided by an embodiment of the present invention;

[0043] Figure 4 This is a schematic flow chart of the steps of determining an adjustment threshold set in a method for preventing backflow of energy storage provided by an embodiment of the present invention;

[0044] Figure 5This is a schematic flow chart of the steps for adjusting a preset anti-backflow threshold range in an energy storage anti-backflow method provided by an embodiment of the present invention;

[0045] Figure 6 This is a schematic flow chart of the steps of canceling a power reduction instruction in a method for preventing backflow of energy storage provided by an embodiment of the present invention;

[0046] Figure 7 This is a flowchart of steps for calculating an anti-backflow alarm level in an energy storage anti-backflow method provided by an embodiment of the present invention;

[0047] Figure 8 This is a structural block diagram of a backflow prevention device in a specific embodiment provided by an embodiment of the present invention;

[0048] Figure 9 This is a structural diagram of a high-pressure backflow prevention system in a specific embodiment provided by an embodiment of the present invention;

[0049] Figure 10 This is a schematic flow chart of a high-pressure backflow prevention strategy in a specific embodiment provided by an embodiment of the present invention;

[0050] Figure 11 This is a structural diagram of a low-pressure backflow prevention system in a specific embodiment provided by an embodiment of the present invention;

[0051] Figure 12 This is a schematic flow chart of a low-pressure backflow prevention strategy in a specific embodiment provided by an embodiment of the present invention;

[0052] Figure 13 This is a structural block diagram of an energy storage anti-backflow system provided by an embodiment of the present invention;

[0053] Figure 14 The figure is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are provided for ease of description only and do not limit the order of the steps. The order of execution of the steps in the embodiments can be adaptively adjusted based on the understanding of those skilled in the art.

[0055] In the following description, reference is made to “some embodiments”, which describes a subset of all possible embodiments, but it will be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0056] In the following description, the terms "first\second\third" are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It is understandable that "first\second\third" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present invention described herein can be implemented in an order other than that illustrated or described herein.

[0057] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention pertains. The terms used in the embodiments of the present invention are for the purpose of describing the embodiments of the present invention only and are not intended to limit the present invention.

[0058] Before further explaining the embodiments of the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are subject to the following interpretations.

[0059] Energy storage backflow prevention: This prevents the load from being unable to absorb the energy stored in the energy storage system when discharging, thereby causing the energy to be fed back to the grid.

[0060] Integrated energy storage cabinet: refers to an energy storage system that uses batteries as energy storage carriers and includes a cabinet, battery pack units, battery management units, energy storage converters, control units, fire protection units, and temperature and humidity management units.

[0061] Figure 1 This is an optional flow chart of an energy storage backflow prevention method provided in an embodiment of the present application. Figure 1 The method may include but is not limited to steps S101 to S103.

[0062] Step S101, obtaining a bus voltage value and a current transformer output power value, and comparing the bus voltage value with a preset voltage threshold;

[0063] Step S102: If the bus voltage value is greater than or equal to the preset voltage threshold, a high-voltage backflow prevention operation is performed according to the current transformer output power value and the preset backflow prevention threshold range;

[0064] Step S103: If the bus voltage value is less than the preset voltage threshold, a low voltage backflow prevention operation is performed according to the current transformer output power value and the preset backflow prevention threshold range.

[0065] In steps S101 to S106 shown in the embodiment of the present application, the backflow prevention device is connected to the energy storage device and establishes a communication connection with the energy management system of the energy storage device and the grid connection point of the energy storage device. Then, the output power of the energy storage device and the bus voltage value of the energy storage device connected to the grid, such as the output power of the energy storage device transformer, are collected in real time. The system determines the access form of the energy storage device based on the collected bus voltage value, and then matches the corresponding backflow prevention strategy for energy management. At the same time, the system compares the collected output power of the energy storage device with a preset backflow prevention threshold to determine whether the energy storage device has a backflow phenomenon. In this embodiment, the system determines whether the energy storage device is connected to high voltage based on the bus voltage value. For example, in the case of high-voltage anti-backflow and low-voltage access, the system adopts a high-voltage anti-backflow strategy to manage the energy storage device and achieve backflow prevention. If the system determines that the energy storage device is low-voltage access, such as low-voltage multi-grid point low-voltage anti-backflow access, the system adopts a low-voltage anti-backflow strategy to manage the energy storage device. Specifically, the system determines whether the energy storage device has backflow based on the set backflow prevention threshold and the real-time collected output power of the energy storage device. The backflow prevention threshold includes an upper limit and a lower limit, both of which are positive power values, indicating that the energy storage device is allowed to charge from the grid. When the output power of the energy storage device is lower than the lower limit of the backflow prevention threshold, the system determines that the energy storage device is close to returning power to the grid, that is, a backflow phenomenon occurs.

[0066] See also Figure 2 In some embodiments, step S102 may include but is not limited to steps S201 to S204:

[0067] Step S201, comparing the current transformer output power value with a preset anti-backflow threshold range;

[0068] Step S202: If the current transformer output power value is greater than the upper limit of the preset anti-backflow threshold range, the current state of the energy management system is maintained;

[0069] Step S203: If the current transformer output power value is within the preset anti-backflow threshold range, calculate the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range, and issue an anti-backflow alarm according to the anti-backflow alarm level;

[0070] Step S204: If the current transformer output power value is less than the lower limit of the preset anti-backflow threshold range, a power reduction instruction is generated according to a preset step size, and the power reduction instruction is sent to the energy management system.

[0071] In step S201 of some embodiments, the system determines that the energy storage device is in a high-voltage access form based on the collected bus voltage value, and matches the high-voltage backflow prevention strategy to perform backflow prevention monitoring and backflow prevention processing on the energy storage device; the system compares the real-time collected output power of the energy storage device with the set backflow prevention threshold to determine whether the energy storage device has a backflow phenomenon.

[0072] In step S202 of some embodiments, if the system determines that the current output power of the energy storage device exceeds the upper limit of the set backflow prevention threshold, it means that the energy storage device is currently obtaining electricity from the power grid for charging and the energy storage device is in a normal working state; at this time, the system does not take any action, and the energy management system built into the energy storage device maintains its current state.

[0073] In step S203 of some embodiments, if the system determines through comparison that the current output power of the energy storage device is less than or equal to the upper limit of the anti-backflow threshold, and the current output power of the energy storage device is greater than or equal to the lower limit of the anti-backflow threshold, it means that the load connected to the energy storage device cannot fully consume the output electric energy, and some energy storage integrated cabinet devices in the energy storage device may have a backflow phenomenon; the system calculates based on the current output power of the energy storage device and the upper and lower limits of the preset anti-backflow threshold, and determines the fault alarm signal and the anti-backflow alarm signal under different anti-backflow conditions. The system sends an anti-backflow alarm to the energy management system in the energy storage device based on the calculation results; the energy management system in the energy storage device performs energy management on the energy storage device after receiving the anti-backflow alarm, and realizes energy consumption through the cross-transformer.

[0074] In step S204 of some embodiments, if the system determines through comparison that the current output power of the energy storage device is less than the lower limit of the anti-backflow threshold, it means that the energy storage device returns electric energy to the power grid, and a backflow phenomenon occurs; the system generates a power adjustment instruction according to the set power adjustment step, and sends the power adjustment instruction to the energy management system set in the energy storage device. The energy management system in the energy storage device adjusts the output power of the energy storage device according to the power adjustment instruction according to the preset power adjustment step to reduce the reverse power output of the energy storage device.

[0075] See also Figure 3 In some embodiments, step S103 may include but is not limited to steps S301 to S304:

[0076] Step S301: obtaining a power value data set and comparing the current transformer output power value with a preset anti-backflow threshold range; wherein the power value data set includes a grid-connected power value, a first metering power value, and a second metering power value;

[0077] Step S302: If the current transformer output power value is greater than the upper limit of the preset anti-backflow threshold range, the current state of the energy management system is maintained;

[0078] Step S303: If the current transformer output power value is within the preset anti-backflow threshold range, calculate the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range, and issue an anti-backflow alarm according to the anti-backflow alarm level;

[0079] Step S304: If the current transformer output power value is less than the lower limit of the preset anti-backflow threshold range, calculation is performed based on the current transformer output power value and the power value data set to determine the adjustment threshold set, and a power reduction instruction is generated based on the adjustment threshold set and the preset step size, and the power reduction instruction is sent to the energy management system.

[0080] In step S301 of some embodiments, the system determines that the energy storage device is in a low-voltage access form based on the collected bus voltage value, and matches the low-voltage backflow prevention strategy to monitor and prevent backflow of the energy storage device; in this embodiment, the system simulates the high-voltage backflow prevention strategy by judging the total backflow prevention power value of multiple grid-connected points and superimposing them to realize the backflow prevention function of the energy storage device; because in the low-voltage grid-connected form, the low-voltage transformers of multiple energy storage devices are connected to the low-voltage grid-connected points and then connected to the power grid; in addition to obtaining the output power of the energy storage device, the system also needs to collect the backflow prevention power value of the grid-connected points to determine whether the multiple grid-connected access devices have a backflow phenomenon on the power grid at different grid-connected nodes; at the same time, a gateway meter is set at each grid-connected node to measure the power data of the energy storage device in addition to general loads.

[0081] In step S302 of some embodiments, the system compares the collected transformer output power data with a preset anti-backflow threshold range to determine whether a backflow phenomenon occurs in the current energy storage device; if the system determines that the output power value of the transformer exceeds the upper limit of the preset anti-backflow threshold range, it indicates that the current power grid is outputting power to the energy storage device, that is, the energy storage device is storing electrical energy; the system maintains the working state of the energy management system in the current energy storage device and does not perform anti-backflow processing.

[0082] In step S303 of some embodiments, if the system determines that the current transformer output power value falls within the set anti-backflow threshold range, the system determines that some of the multiple energy storage devices connected to the power grid may have a backflow phenomenon, that is, the loads connected to some energy storage devices cannot fully absorb the electric energy output by the energy storage devices, and the remaining electric energy is returned to the power grid; the system calculates based on the current transformer output power value and the set anti-backflow threshold range, determines the anti-backflow alarm level corresponding to the current possible backflow phenomenon, and issues an anti-backflow alarm to the energy management system in the energy storage device according to the calculated alarm level. The energy management system regulates the energy storage device according to the received anti-backflow alarm to reduce the occurrence of partial backflow phenomena.

[0083] In step S304 of some embodiments, the system determines that the current transformer output power is lower than the lower limit of the set anti-backflow threshold range, and the system determines that a backflow phenomenon occurs in the energy storage device; the system calculates the power adjustment threshold based on the current transformer output power value, the collected grid-connected power and the output power of the energy storage device, and the system generates a corresponding power reduction instruction based on the calculated power adjustment threshold, and sends it to the energy management system of the energy storage device via wired or wireless means. The energy management system adjusts the output power of the energy storage device according to the received power reduction instruction, reduces the output electric energy, and transfers the excess electric energy to other transformer devices in the energy storage device for consumption, so as to reduce the phenomenon of electric energy being returned to the power grid.

[0084] See also Figure 4 In some embodiments, step S304 may include but is not limited to steps S401 to S403:

[0085] Step S401, calculating the sum of the current transformer output power value and the first metered power in the power value data set as the first load power value; calculating the sum of the grid-connected power value in the power value data set and the second metered power value in the power value data set as the second load power value;

[0086] Step S402: Calculate based on the first load power value, the second load power value, and the first load power value to determine a first parameter; and use the ratio of the current transformer output power value to the first parameter as a first adjustment threshold; calculate based on the first load power value, the second load power value, and the second load power value to determine a second parameter; and use the ratio of the grid-connected power value to the second parameter as a second adjustment threshold;

[0087] Step S403: determining an adjustment threshold set according to the first adjustment threshold and the second adjustment threshold.

[0088] In step S401 of some embodiments, the system calculates a power regulation threshold based on the current transformer output power value, the collected grid-connected power, and the output power of the energy storage device. The system limits the amplitude of power regulation by the energy management system in the energy storage device based on the calculated power regulation threshold to avoid excessive power fluctuations output by the energy storage device, thereby affecting the normal operation of the load connected to the energy storage device. In this embodiment, the system calculates the sum of the current transformer output power and the metered power value collected by the metering meter as the load power value of the energy storage device connected to the same grid-connected node. Similarly, the load power values of other nodes are calculated. The system determines the power value required by the load connected to each energy storage device based on the calculated load power value, and then determines the power regulation threshold corresponding to the load.

[0089] In step S402 of some embodiments, the system first calculates the ratio of the transformer output power to the load power of each grid-connected node, then calculates the ratio of this ratio to the total load power of all grid-connected nodes, and determines the maximum power regulation threshold of each grid-connected node. For example, in an energy storage system with two grid-connected nodes, the backflow prevention system calculates the maximum power regulation threshold of the first grid-connected node and the second grid-connected node respectively using the following formula:

[0090]

[0091] Among them, a and b are the maximum regulation thresholds of grid connection point 1 and grid connection point 2 respectively, P 逆 is the sum of the anti-backflow power values of grid connection point 1 and grid connection point 2, P 负1 , P 负2 They are the load power values of grid connection point 1 and grid connection point 2 respectively.

[0092] In step S403 of some embodiments, the system uses the calculated maximum power regulation threshold of each grid connection point as the regulation threshold set. The system generates corresponding power adjustment instructions based on the regulation threshold set and sends them to the energy management system of each corresponding energy storage device, so that the energy management system gradually adjusts the power output of each energy storage module, reduces backflow, and improves the energy utilization rate of the energy storage device.

[0093] See also Figure 5 In some embodiments, the energy storage backflow prevention method provided by the embodiment of the present invention may also include but is not limited to steps S501 to S503:

[0094] Step S501, obtaining the number of anti-backflow alarms within a preset time period, and comparing the number of anti-backflow alarms with a preset limit value;

[0095] Step S502: If the number of anti-backflow alarms is less than or equal to the preset limit value, maintain the preset anti-backflow threshold range;

[0096] Step S503: If the number of backflow prevention alarms is greater than the preset limit value, the upper limit value and the lower limit value of the preset backflow prevention threshold range are adjusted according to the preset values.

[0097] In step S501 of some embodiments, the system regularly performs operation and maintenance inspections on the energy management system of each energy storage device, counts the number of anti-backflow alarms received by each energy management system within an operation and maintenance inspection cycle, compares the statistical results with the set limit value, and determines whether to adjust the pre-set anti-backflow threshold to improve the sensitivity of the anti-backflow processing.

[0098] In step S502 of some embodiments, if the system determines that the number of anti-backflow alarms received by the current energy management system is less than or equal to the set limit value, it means that the risk of backflow occurring in the energy storage device during operation is low, and the system can normally monitor whether backflow occurs in each energy storage device.

[0099] In step S503 of some embodiments, if the system determines that the number of anti-backflow alarms received by the current energy management system exceeds the set limit value, it means that the energy storage device has a high risk of backflow during operation, and the system's current anti-backflow threshold is too low. When the energy storage device has backflow, the system may not be able to detect it. Therefore, it is necessary to increase the upper and lower limits of the anti-backflow threshold to improve the accuracy of system monitoring.

[0100] See also Figure 6 In some embodiments, the energy storage backflow prevention method provided by the embodiment of the present invention may also include but is not limited to steps S601 to S603:

[0101] Step S601, determining a consecutive number of times based on the output power value of the power-adjusted transformer and a preset anti-backflow threshold range, and comparing the consecutive number of times with a preset threshold; wherein the consecutive number of times represents the consecutive number of times the output power value of the power-adjusted transformer is greater than the upper limit of the preset anti-backflow threshold range;

[0102] Step S602: If the number of consecutive times is less than the preset threshold, the power reduction instruction is maintained and a warning instruction for adjusting the anti-backflow threshold is issued;

[0103] Step S603: If the consecutive times are greater than or equal to the preset threshold, the power reduction instruction is cancelled and the preset anti-backflow threshold range is maintained.

[0104] In step S601 of some embodiments, upon detecting a backflow phenomenon in an energy storage device, the system generates a power adjustment instruction and sends it to the energy management system of the corresponding energy storage device. After the energy management system reduces the output power of the energy storage device according to the power adjustment instruction, the system detects the output power of the energy storage device to determine whether it exceeds the upper limit of the backflow prevention threshold, and determines whether to adjust the output power of the energy storage device through comparison.

[0105] In step S602 of some embodiments, if the upper limit value is still not exceeded, indicating that the energy storage device still has a backflow risk, the system continues to generate a power adjustment instruction to enable the energy management system to adjust the output power of the energy storage device;

[0106] In step S603 of some embodiments, if the output power of the energy storage device exceeds the upper limit value, the system continuously detects whether the output power of the energy storage device exceeds the upper limit value. If the system monitors that the output power of the energy storage device exceeds the upper limit value for multiple consecutive times and meets the set threshold, such as 3 consecutive times or 10 consecutive times, the system cancels the power adjustment instruction issued to the energy management system.

[0107] See also Figure 7 In some embodiments, the energy storage backflow prevention method provided by the embodiment of the present invention may also include but is not limited to steps S701 to S703:

[0108] Step S701, calculating the ratio of the current transformer output power value to the lower limit of the preset anti-backflow threshold range to determine the third parameter; calculating the ratio of the current transformer output power value to the upper limit of the preset anti-backflow threshold range to determine the fourth parameter;

[0109] Step S702: Determine the anti-backflow alarm level according to the third parameter and the fourth parameter.

[0110] In step S701 of some embodiments, when the system detects that the output power of the energy storage device falls within a preset anti-backflow threshold, the system calculates the anti-backflow alarm level based on the output power of the energy storage device and the upper and lower limits of the anti-backflow threshold; in this embodiment, the system calculates the ratio of the output power of the energy storage device to the upper and lower limits of the anti-backflow threshold respectively, which is used to further determine the specific alarm signal.

[0111] In step S702 of some embodiments, fault alarm signals and anti-backflow alarm signals of different anti-backflow conditions are triggered according to the calculated ratio; for example: minor alarm, medium alarm, severe alarm, etc.

[0112] The following describes the embodiments of the present invention in detail with reference to specific application examples:

[0113] See also Figure 8 The energy storage anti-backflow method provided by the embodiment of the present invention is applied in the following situations: Figure 8 In the anti-backflow monitoring device shown, the device is provided with a data acquisition module, a data calculation module, a data control module and an interface module; wherein the data acquisition module collects the real-time charging and discharging power of the transformer side emitted by the grid meters on different bus sides; when the anti-backflow meters on the grid side of multiple grid-connected points are connected, the data calculation module performs corresponding anti-backflow data calculation according to the type of bus where the meter is located, and determines the corresponding power output value; the data control module compares the calculated anti-backflow data with the preset threshold range, and sends different anti-backflow level signals according to its internal self-judgment algorithm; the interface module includes a certain number of different types of interfaces, including optical fiber interface, RJ45 interface and RS485 interface.

[0114] When multiple energy storage cabinets are connected to the grid through two 400V low-voltage grid connection points, in order to prevent local reverse flow between low-voltage transformers and achieve good absorption, the anti-reverse flow meter sampling point is set at the 400V upper-level high-voltage grid connection point, such as Figure 9 As shown, the high-voltage backflow prevention meter can draw power from the 220V power supply inside the high-voltage distribution room; since the two grid connection points are far away from the high-voltage backflow prevention point, the high-voltage backflow prevention and energy storage system grid connection points are directly connected using an optical fiber interface, and the high-voltage backflow prevention monitoring device is close to the high-voltage backflow prevention meter and directly communicates using the RS485 serial port; Figure 10 As shown, the anti-backflow monitoring device compares the real-time collected power value with the set anti-backflow threshold. If the power value falls between the upper and lower limits P1 and P2 of the anti-backflow threshold, the anti-backflow monitoring device sends a slight backflow alarm to the energy management system in each energy storage cabinet as a reminder, without limiting the power output of each energy storage cabinet. During the regular monthly operation and maintenance of the system, if it is found that the number of slight backflow alarms exceeds the limit value, the upper and lower limits P1 and P2 of the anti-backflow threshold will be revised and increased. If the power value is greater than the upper limit P2 of the anti-backflow threshold, the anti-backflow monitoring device will not operate, and the energy storage cabinet will be turned off. The cabinet maintains its current working state; if the power value is less than the lower limit of the anti-backflow threshold P1, the anti-backflow device sends a phased power reduction step adjustment instruction to the energy management system of each energy storage integrated cabinet, and adjusts the power with a certain step size, which ranges from 5 to 15kW / s; the energy management system in each energy storage integrated cabinet responds to the issued power reduction instruction to adjust the power; the anti-backflow device detects the output power of the energy storage integrated cabinet in real time until it detects that the output power is greater than the upper limit of the anti-backflow threshold P2 for 3 to 10 consecutive times, and the anti-backflow device can cancel the anti-backflow power reduction instruction.

[0115] When the high-voltage side cannot meet the requirements of connecting to the high-voltage anti-backflow meter, the anti-backflow device adopts the low-voltage anti-backflow superposition algorithm to implement the "virtual high-voltage anti-backflow strategy" for anti-backflow processing; Figure 11 As shown in the figure, the anti-backflow device is installed in the main energy storage integrated cabinet of grid connection point 1, and is powered by a 220V power supply. At the same time, a low-voltage side metering meter is installed between the two grid connection points and the energy storage integrated cabinet to collect the gateway metering power value of the energy storage integrated cabinet. Since the two grid connection points are close to the low-voltage anti-backflow point, the low-voltage anti-backflow and the two grid connection points of the energy storage system are directly connected using the RS485 interface. The anti-backflow monitoring device is close to the high-voltage anti-backflow meter and directly communicates using the RS485 serial port. Figure 12 As shown, the anti-backflow device collects the real-time anti-backflow value P of the two grid-connected nodes. 逆1 、P 逆2 , and the gateway metering power value P collected by the metering meter of the grid-connected node 计1, P 计2 ; Calculate the sum of the anti-backflow values of the two grid-connected nodes as P 逆 , the load power value P of the two grid-connected nodes 负1 、P 负2 , calculate the maximum regulation thresholds a and b of the two grid-connected nodes based on the calculated sum of the anti-backflow values and the load power values of the two grid-connected nodes; compare the sum of the anti-backflow values with the set anti-backflow thresholds. If the sum of the anti-backflow values falls between the upper and lower limits P1 and P2 of the anti-backflow thresholds, the anti-backflow monitoring device will send a slight backflow alarm to the energy management system in each energy storage cabinet as a reminder, without limiting the power output of each energy storage cabinet; during the regular monthly operation and maintenance of the system, if it is found that the number of slight backflow alarms exceeds the limit value, the upper and lower limits P1 and P2 of the anti-backflow threshold will be revised and increased; if the sum of the anti-backflow values falls between the upper and lower limits P1 and P2 of the anti-backflow thresholds, the anti-backflow monitoring device will send a slight backflow alarm to the energy management system in each energy storage cabinet as a reminder, without limiting the power output of each energy storage cabinet; during the regular monthly operation and maintenance of the system, if it is found that the number of slight backflow alarms exceeds the limit value, the upper and lower limits P1 and P2 of the anti-backflow threshold will be revised and increased; If the sum of the anti-backflow values is less than the anti-backflow lower limit P1, the anti-backflow monitoring device will not operate and the energy storage cabinet will maintain its current working state. If the sum of the anti-backflow values is less than the anti-backflow lower limit P1, the anti-backflow device will adjust the output power of the energy storage cabinet of each grid-connected node based on the calculated maximum adjustment thresholds a and b of the grid-connected node. The anti-backflow device will detect the output power of each energy storage cabinet in real time and calculate the sum of the output power of each energy storage cabinet in real time. If the sum of the output powers is detected to be greater than the anti-backflow upper limit P2 for 3 to 10 consecutive times, the anti-backflow device will cancel the anti-backflow power reduction instruction.

[0116] Implementation of the embodiments of the present invention includes the following beneficial effects: the embodiments of the present invention provide a method, system, electronic device, and storage medium for energy storage backflow prevention; the scheme obtains the bus voltage value and transformer output power value of the energy storage device connected to the power grid; compares the bus voltage value with a set voltage threshold; when the bus voltage value is greater than or equal to the set voltage threshold, adopts a high-voltage backflow prevention strategy, determines whether the energy storage device has backflow based on the obtained transformer output power value and a preset backflow prevention threshold range, and performs a high-voltage backflow prevention operation; when the bus voltage value is less than the set voltage threshold, adopts a low-voltage backflow prevention strategy, determines whether the energy storage device has backflow based on the obtained transformer output power value and a preset backflow prevention threshold range, and performs a low-voltage backflow prevention operation; determines the bus type by detecting the bus voltage, and then matches the corresponding backflow prevention strategy to perform backflow prevention processing on the energy storage device, is compatible with different energy storage device access conditions, and improves the backflow prevention effect; sets an backflow prevention threshold range to determine whether backflow occurs, prevents the energy storage device from repeatedly starting during dynamic fluctuations, and thereby improves the overall backflow prevention effect.

[0117] See also Figure 13 The embodiment of the present invention further provides an energy storage backflow prevention system, which can implement the above energy storage backflow prevention method. The system includes a data acquisition module, a data processing module and an interface module, wherein:

[0118] The data acquisition module is used to obtain the bus voltage value and the current transformer output power of the energy storage device, and send the bus voltage value and the current transformer output power to the data processing module;

[0119] A data processing module, configured to execute the method of the above method embodiment;

[0120] Interface module, used to connect energy storage devices.

[0121] It can be seen that the contents of the above method embodiments are all applicable to the present system embodiments. The functions specifically implemented by the present system embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0122] The present application also provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the aforementioned energy storage backflow prevention method. The electronic device can be any smart terminal, such as a tablet computer or an in-vehicle computer.

[0123] It can be understood that the contents of the above method embodiments are applicable to the present device embodiments, the functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0124] See also Figure 14 , Figure 14 The hardware structure of an electronic device according to another embodiment is shown. The electronic device includes:

[0125] The processor 1401 can be implemented as a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0126] The memory 1402 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 1402 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1402 and is called by the processor 1401 to execute a method for preventing backflow of energy storage in the embodiments of this application.

[0127] Input / output interface 1403, used to implement information input and output;

[0128] Communication interface 1404, used to implement communication interaction between this device and other devices, which can be achieved through wired means (such as USB, network cable, optical fiber, etc.) or wireless means (such as mobile network, WiFi, Bluetooth, etc.);

[0129] Bus 1405 , which transmits information between various components of the device (e.g., processor 1401 , memory 1402 , input / output interface 1403 , and communication interface 1404 );

[0130] The processor 1401 , the memory 1402 , the input / output interface 1403 and the communication interface 1404 are connected to each other in communication within the device via a bus 1405 .

[0131] Among them, the memory is a non-transient computer-readable storage medium that can be used to store non-transient software programs and non-transient computer executable programs. The memory may include a high-speed random access memory and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some embodiments, the memory optionally includes a remote memory remotely arranged relative to the processor, and these remote memories can be connected to the processor via a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network and a combination thereof.

[0132] In addition, the embodiments of the present application further disclose a computer program product or computer program, which is stored in a computer-readable storage medium. The processor of a computer device can read the computer program from the computer-readable storage medium, and the processor executes the computer program, so that the computer device performs the above-mentioned method. Similarly, the contents of the above-mentioned method embodiment are all applicable to the present storage medium embodiment, and the functions specifically implemented by the present storage medium embodiment are the same as those of the above-mentioned method embodiment, and the beneficial effects achieved are also the same as those achieved by the above-mentioned method embodiment.

[0133] An embodiment of the present application further provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the above-mentioned energy storage backflow prevention method is implemented.

[0134] It can be understood that the contents of the above method embodiments are all applicable to the present storage medium embodiment, the functions specifically implemented by the present storage medium embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0135] It is understood that all or some steps, systems in the disclosed method above can be implemented as software, firmware, hardware and appropriate combinations thereof. Some physical components or all physical components can be implemented as software by a processor, such as a central processing unit, a digital signal processor or a microprocessor, or implemented as hardware, or implemented as an integrated circuit, such as an application specific integrated circuit. Such software can be distributed on a computer-readable medium, and the computer-readable medium can include computer storage media (or non-transitory media) and communication media (or temporary media). As known to those of ordinary skill in the art, the term computer storage medium is included in any method or technology for storing information (such as computer-readable instructions, data structures, program modules or other data) and is volatile and non-volatile, removable and non-removable media. Computer storage media includes but is not limited to RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disk (DVD) or other optical disk storage, magnetic cassette, magnetic tape, disk storage or other magnetic storage device, or can be used to store desired information and any other medium that can be accessed by a computer. Furthermore, as is well known to those skilled in the art, communication media typically embodies computer-readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and may include any information delivery media.

[0136] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A method for preventing backflow of energy storage, characterized in that: The method comprises: Obtaining a bus voltage value and a current transformer output power value, and comparing the bus voltage value with a preset voltage threshold; If the bus voltage value is greater than or equal to the preset voltage threshold, a high-voltage backflow prevention operation is performed according to the current transformer output power value and the preset backflow prevention threshold range; If the bus voltage value is less than the preset voltage threshold, a low-voltage backflow prevention operation is performed according to the current transformer output power value and the preset backflow prevention threshold range.

2. The method according to claim 1, characterized in that The performing of the high-voltage backflow prevention operation according to the current transformer output power value and the preset backflow prevention threshold range specifically includes: Comparing the current transformer output power value with the preset anti-backflow threshold range; If the current transformer output power value is greater than the upper limit of the preset anti-backflow threshold range, maintaining the current state of the energy management system; If the current transformer output power value is within the preset anti-backflow threshold range, calculating the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range, and issuing an anti-backflow alarm according to the anti-backflow alarm level; If the current transformer output power value is less than the lower limit of the preset anti-backflow threshold range, a power reduction instruction is generated according to a preset step size, and the power reduction instruction is sent to the energy management system.

3. The method according to claim 1, characterized in that The performing of the low-voltage backflow prevention operation according to the current transformer output power value and the preset backflow prevention threshold range specifically includes: Obtain a power value data set, and compare the current transformer output power value with the preset anti-backflow threshold range; wherein the power value data set includes the grid-connected point transformer output power value, the first metering power value, and the second metering power value; If the current transformer output power value is greater than the upper limit of the preset anti-backflow threshold range, maintaining the current state of the energy management system; If the current transformer output power value is within the preset anti-backflow threshold range, calculating the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range, and issuing an anti-backflow alarm according to the anti-backflow alarm level; If the current transformer output power value is less than the lower limit of the preset anti-backflow threshold range, calculation is performed based on the current transformer output power value and the power value data set to determine the adjustment threshold set, and a power reduction instruction is generated based on the adjustment threshold set and the preset step size, and the power reduction instruction is sent to the energy management system.

4. The method according to claim 3, characterized in that The calculating according to the current transformer output power value and the power value data set to determine the adjustment threshold set specifically includes: Calculate the sum of the current transformer output power value and the first metered power in the power value data set as the first load power value; calculate the sum of the grid-connected power value in the power value data set and the second metered power value in the power value data set as the second load power value; Calculating based on the first load power value, the second load power value, and the first load power value to determine a first parameter; and using the ratio of the current transformer output power value to the first parameter as a first adjustment threshold; calculating based on the first load power value, the second load power value, and the second load power value to determine a second parameter; and using the ratio of the grid-connected power value to the second parameter as a second adjustment threshold; The adjustment threshold set is determined according to the first adjustment threshold and the second adjustment threshold.

5. The method according to any one of claims 2 to 4, characterized in that The method further comprises: Obtaining the number of anti-backflow alarms within a preset time period, and comparing the number of anti-backflow alarms with a preset limit value; If the number of anti-backflow alarms is less than or equal to the preset limit value, maintaining the preset anti-backflow threshold range; If the number of anti-backflow alarms is greater than the preset limit value, the upper limit value and the lower limit value of the preset anti-backflow threshold range are adjusted according to the preset values.

6. The method according to any one of claims 2 to 4, characterized in that The method further comprises: Determining a consecutive number of times based on the output power value of the power-adjusted transformer and the preset anti-backflow threshold range, and comparing the consecutive number of times with the preset threshold; wherein the consecutive number of times represents the consecutive number of times the output power value of the power-adjusted transformer is greater than the upper limit of the preset anti-backflow threshold range; If the number of consecutive times is less than the preset threshold, the power reduction instruction is maintained, and a warning instruction for adjusting the anti-backflow threshold is issued; If the number of consecutive times is greater than or equal to the preset threshold, the power reduction instruction is canceled and the preset backflow prevention threshold range is maintained.

7. The method according to any one of claims 2 to 4, characterized in that The calculating the anti-backflow alarm level according to the current transformer output power value and the preset anti-backflow threshold range specifically includes: Calculate the ratio of the current transformer output power value to the lower limit of the preset anti-backflow threshold range to determine the third parameter; calculate the ratio of the current transformer output power value to the upper limit of the preset anti-backflow threshold range to determine the fourth parameter; The anti-backflow alarm level is determined according to the third parameter and the fourth parameter.

8. An energy storage anti-backflow system, characterized in that: It includes data acquisition module, data processing module and interface module, among which: The data acquisition module is used to obtain the bus voltage value and the current transformer output power of the energy storage device, and send the bus voltage value and the current transformer output power to the data processing module; The data processing module is used to execute the method according to any one of claims 1 to 7; The interface module is used to connect to the energy storage device.

9. An electronic device, characterized in that: include: at least one processor; at least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a program executable by a processor, characterized in that: The processor-executable program is configured to perform the method according to any one of claims 1 to 7 when executed by the processor.

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