Control method and device for operation mode of energy storage device and storage medium

Abstract

The invention discloses a control method and device for an operation mode of an energy storage device and a storage medium, and belongs to the technical field of energy management and control. The energy storage device is arranged on the three-phase power supply system, the three-phase power supply system further comprises a transformer and an electric energy detection device, the electric energy detection device and the energy storage device are arranged on the low-voltage side of the transformer, and the electric energy detection device is arranged between the transformer and the energy storage device. The control method comprises the following steps: acquiring three-phase current and three-phase voltage corresponding to a low-voltage side of a transformer in a three-phase power supply system detected by an electric energy detection device; determining a voltage unbalance degree and a current unbalance degree of the three-phase power supply system and a transformer load rate of a transformer according to the three-phase current and the three-phase voltage; determining a target operation mode of the energy storage device according to the voltage unbalance degree, the current unbalance degree and the transformer load rate; and controlling the operation mode of the energy storage device to be the target operation mode. The control effect on the operation mode of the energy storage device can be improved.

Description

Technical Field

[0001] The present application relates to the field of energy management and control technology, and specifically to a control method, device and storage medium for an energy storage device operating mode. Background Art

[0002] In existing technologies, power supply systems are typically equipped with energy storage devices with various operating modes to meet diverse user needs. Controlling the operating mode of an energy storage device typically relies on the experience of technicians, manually selecting the appropriate energy storage device to achieve control of the energy storage device's operating mode. However, this existing technology relies too heavily on manual judgment, which is prone to bias, resulting in poor control of the energy storage device's operating mode. Consequently, this existing technology suffers from poor control effectiveness. Summary of the Invention

[0003] The purpose of the embodiments of the present application is to provide a control method, device, three-phase power supply system and storage medium for the operation mode of an energy storage device, so as to solve the problem of poor control effect existing in the prior art.

[0004] To achieve the above-mentioned objectives, the present application provides, in a first aspect, a control method for an operating mode of an energy storage device, wherein the energy storage device is provided in a three-phase power supply system, the three-phase power supply system further comprising a transformer and an electric energy detection device, the electric energy detection device and the energy storage device being provided on the low-voltage side of the transformer, and the electric energy detection device being provided between the transformer and the energy storage device, the control method comprising: Obtaining the three-phase current and three-phase voltage corresponding to the low-voltage side of the transformer in the three-phase power supply system detected by the electric energy detection device; Determine the voltage unbalance, current unbalance and transformer load factor of the three-phase power supply system based on the three-phase current and three-phase voltage; Determine the target operating mode of the energy storage device based on the voltage imbalance, current imbalance and transformer load factor; The operation mode of the energy storage device is controlled to be a target operation mode.

[0005] In an embodiment of the present application, the target operating mode includes a three-phase power unbalanced distribution operating mode, and the target operating mode of the energy storage device is determined based on the voltage imbalance, the current imbalance, and the transformer load rate, including: when any one of the voltage imbalance, the current imbalance, and the transformer load rate is greater than or equal to the corresponding preset threshold value, determining that the target operating mode of the energy storage device is the three-phase power unbalanced distribution operating mode.

[0006] In an embodiment of the present application, the target operating mode includes a three-phase power balanced distribution operating mode. The target operating mode of the energy storage device is determined based on the voltage imbalance, the current imbalance, and the transformer load rate, including: when the voltage imbalance, the current imbalance, and the transformer load rate are all less than the corresponding preset thresholds, determining that the target operating mode of the energy storage device is the three-phase power balanced distribution operating mode.

[0007] In an embodiment of the present application, the three-phase power balanced distribution operating mode includes a current-limited three-phase power balanced distribution operating mode, which is used to reduce the output power of the energy storage device; the control method also includes: when there is a backflow phenomenon in the electric energy detection device, determining that the target operating mode of the energy storage device is the current-limited three-phase power balanced distribution operating mode.

[0008] In an embodiment of the present application, the three-phase power balanced distribution operation mode includes a non-current-limited three-phase power balanced distribution operation mode, which is used to maintain the output power of the energy storage device. The control method also includes: when there is no backflow phenomenon in the electric energy detection device, determining that the target operation mode of the energy storage device is the non-current-limited three-phase power balanced distribution operation mode.

[0009] In an embodiment of the present application, the control method further includes: controlling the energy storage device to operate in a three-phase power unbalanced distribution operation mode for a preset time period.

[0010] In an embodiment of the present application, the voltage imbalance, current imbalance and transformer load rate of the three-phase power supply system are determined based on the three-phase current and the three-phase voltage, including: determining the voltage imbalance of the three-phase power supply system based on the three-phase voltage, wherein the voltage imbalance is the ratio of the three-phase voltage difference between the maximum and the minimum of the three-phase voltage to the three-phase voltage average of the three-phase voltage; determining the current imbalance of the three-phase power supply system based on the three-phase current, wherein the current imbalance is the ratio of the three-phase current difference between the maximum and the minimum of the three-phase current to the three-phase current average of the three-phase current; determining the transformer load rate of the transformer based on the three-phase voltage and the three-phase current, wherein the transformer load rate is the ratio of the sum of the products of the three-phase current and the corresponding three-phase voltage to the rated capacity of the transformer.

[0011] A second aspect of the present application provides a control device for an energy storage device operating mode, comprising: a memory configured to store instructions; and a processor configured to call the instructions from the memory and to implement the above-mentioned control method for the energy storage device operating mode when executing the instructions.

[0012] The third aspect of the present application provides a three-phase power supply system, including: a transformer; an energy storage device, arranged on the low-voltage side of the transformer; an electric energy detection device, arranged on the low-voltage side of the transformer, located between the transformer and the energy storage device; and a control device for the operating mode of the energy storage device according to the above.

[0013] A fourth aspect of the present application provides a machine-readable storage medium having stored thereon instructions for causing a machine to execute the above-mentioned control method for the operation mode of an energy storage device.

[0014] The above technical solution sets the energy storage device in a three-phase power supply system. The three-phase power supply system also includes a transformer and an electric energy detection device. The electric energy detection device and the energy storage device are set on the low-voltage side of the transformer, and the electric energy detection device is set between the transformer and the energy storage device. Based on this, by determining the voltage imbalance, current imbalance, and transformer load rate of the three-phase power supply system, the power supply state of the three-phase power supply system can be determined based on the voltage imbalance, current imbalance, and transformer load rate of the three-phase power supply system. Based on the above voltage imbalance, current imbalance, and transformer load rate, the target operating mode of the three-phase power supply system is determined, and the operating mode of the energy storage device is automatically controlled to the target operating mode. Compared with the existing technology, the operating mode of the energy storage device can be automatically controlled without relying on the operating experience of technicians for manual judgment, thereby improving the control effect of the operating mode of the energy storage device.

[0015] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following detailed description, they are used to explain the embodiments of the present application but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings: Figure 1 A schematic diagram of a flow chart of a method for controlling an operating mode of an energy storage device according to an embodiment of the present application is shown; Figure 2 The following schematically shows a structural block diagram of a three-phase power supply system according to an embodiment of the present application; Figure 3 A flow chart of another method for controlling an operating mode of an energy storage device according to an embodiment of the present application is schematically shown. DETAILED DESCRIPTION

[0017] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0018] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application are in compliance with the relevant provisions of laws and regulations. In the embodiments of this application, certain software, components, models, and other existing solutions in the industry may be mentioned. These should be considered as exemplary. Their purpose is only to illustrate the feasibility of implementing the technical solution of this application, but it does not mean that the applicant has or will necessarily use such solutions.

[0019] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0020] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0021] Figure 1 The following schematically shows a flow chart of a method for controlling the operation mode of an energy storage device according to an embodiment of the present application. Figure 1 As shown, an embodiment of the present application provides a control method for an energy storage device operating mode. The energy storage device is provided in a three-phase power supply system. The three-phase power supply system further includes a transformer and an electric energy detection device. The electric energy detection device and the energy storage device are provided on the low-voltage side of the transformer. The electric energy detection device is provided between the transformer and the energy storage device. The method is described by taking the application of the method to a processor as an example. The method may include the following steps: Step S101 : acquiring three-phase current and three-phase voltage corresponding to the low-voltage side of a transformer in a three-phase power supply system detected by an electric energy detection device.

[0022] Step S102 : determining the voltage imbalance, current imbalance, and transformer load factor of the three-phase power supply system according to the three-phase current and the three-phase voltage.

[0023] Step S103 : determining a target operation mode of the energy storage device according to the voltage imbalance, the current imbalance, and the transformer load factor.

[0024] Step S104: Control the operation mode of the energy storage device to the target operation mode.

[0025] It can be understood that an energy storage device is a device used to store electrical energy and output it when necessary. An operating mode is the operating mode of an energy storage device tailored to different application scenarios or requirements. A three-phase power supply system is one that uses three AC power lines with a phase difference of 120 degrees and a neutral line to provide power. A three-phase power supply system may include a transformer, an energy detection device, and an energy storage device. The energy detection device and energy storage device can be located on the low-voltage side of the transformer, and the energy detection device can be located between the transformer and the energy storage device. A transformer, such as a step-down transformer, is used to change the voltage level in a three-phase power supply system. This transformer can reduce the output voltage in a three-phase power supply system to meet user needs. An energy detection device is a device used to detect electrical energy (including current, voltage, or power). Three-phase current is the current flowing through the three-phase conductors A, B, and C. Similarly, three-phase voltage is the voltage flowing through the three-phase conductors A, B, and C. Voltage imbalance refers to the degree to which the amplitude or phase of the three-phase voltage in a three-phase power supply system deviates from ideal symmetry. Current imbalance refers to the degree to which the amplitude or phase of the three-phase current in a three-phase power supply system deviates from a symmetrical state. Transformer load factor refers to the degree to which the transformer capacity is utilized. The target operating mode is a specific operating mode among multiple operating modes within the energy storage device.

[0026] Specifically, the processor can obtain the three-phase current and three-phase voltage on the low-voltage side of the transformer in the three-phase system through the electric energy detection device, so that the processor can determine the voltage imbalance, current imbalance and transformer load rate of the three-phase power supply system based on the three-phase current and three-phase voltage, and based on the voltage imbalance, current imbalance and transformer load rate of the three-phase power supply system, it can judge the current power supply status of the three-phase power supply system and the load condition of the transformer, and thus determine the target operating mode of the energy storage device that meets the above power supply status and load condition at the current moment based on the above power supply status and load condition, thereby controlling the operating mode of the energy storage device to the operating mode.

[0027] Through the above technical solution, an energy storage device is installed in a three-phase power supply system. The three-phase power supply system also includes a transformer and an electric energy detection device. The electric energy detection device and the energy storage device are installed on the low-voltage side of the transformer, and the electric energy detection device is installed between the transformer and the energy storage device. Based on this, by determining the voltage imbalance, current imbalance, and transformer load rate of the three-phase power supply system, the power supply state of the three-phase power supply system can be determined based on the voltage imbalance, current imbalance, and transformer load rate of the three-phase power supply system. Based on the above voltage imbalance, current imbalance, and transformer load rate, the target operating mode of the three-phase power supply system is determined, and the operating mode of the energy storage device is automatically controlled to the target operating mode. Compared with the existing technology, the operating mode of the energy storage device can be automatically controlled without relying on the operating experience of technicians for manual judgment, thereby improving the control effect of the operating mode of the energy storage device.

[0028] In an embodiment of the present application, the target operating mode includes a three-phase power unbalanced distribution operating mode. Determining the target operating mode of the energy storage device based on the voltage imbalance, the current imbalance, and the transformer load rate may include: when any one of the voltage imbalance, the current imbalance, and the transformer load rate is greater than or equal to the corresponding preset threshold value, determining that the target operating mode of the energy storage device is the three-phase power unbalanced distribution operating mode.

[0029] It is understood that the preset threshold is a pre-set threshold, and voltage imbalance, current imbalance, and transformer load rate each correspond to a preset threshold. The target operating mode may include, but is not limited to, a three-phase unbalanced power distribution operating mode. The three-phase unbalanced power distribution operating mode is an operating mode that distributes three-phase power unevenly and is used to address power instability issues in three-phase power supply systems. Power instability issues may include three-phase imbalance or transformer overload.

[0030] Specifically, the processor may pre-set preset thresholds corresponding to the voltage imbalance, current imbalance, and transformer load rate, so that the voltage imbalance, current imbalance, and transformer load rate detected by the electric energy detection device are compared with their corresponding preset thresholds. When any one of the voltage imbalance, current imbalance, and transformer load rate is greater than or equal to the corresponding preset threshold, it is determined that the three-phase power supply system has a power supply instability problem. When the voltage imbalance or current imbalance is greater than or equal to the corresponding preset threshold, and the transformer load rate is less than the corresponding preset threshold, it is determined that the three-phase power supply system has a three-phase imbalance power supply instability problem; when the voltage imbalance and current imbalance are both less than the corresponding preset threshold, and the transformer load rate is greater than or equal to the corresponding preset threshold, it is determined that the three-phase power supply system has a transformer heavy load or overload problem; and when the voltage imbalance, current imbalance, and transformer load rate are all greater than or equal to the corresponding preset threshold, it is determined that the three-phase power supply system has a three-phase imbalance, transformer heavy load, or overload problem. Based on this, the processor can control the operation mode of the energy storage device to a three-phase power unbalanced distribution operation mode to solve the problem of unstable power supply in the three-phase power supply system and ensure the power supply quality of the three-phase power supply system.

[0031] In an embodiment of the present application, the target operating mode includes a three-phase power balanced distribution operating mode. Determining the target operating mode of the energy storage device based on the voltage imbalance, the current imbalance, and the transformer load rate may include: when the voltage imbalance, the current imbalance, and the transformer load rate are all less than corresponding preset thresholds, determining that the target operating mode of the energy storage device is the three-phase power balanced distribution operating mode.

[0032] It can be understood that the target operating mode may also include but is not limited to the three-phase power balanced distribution operating mode. The three-phase power balanced distribution operating mode is an operating mode for evenly distributing three-phase power, which is used for peak-valley arbitrage and uses time-of-use electricity prices (peak-valley price differences) to reduce electricity costs, that is, storing low-priced electricity during periods of low electricity prices (such as at night) and releasing the stored electricity during periods of peak electricity prices (such as during the day), reducing high-priced grid electricity consumption and earning the difference.

[0033] Specifically, after the processor determines that the voltage imbalance, current imbalance and transformer load rate are all less than the corresponding preset thresholds, it can be determined that there is no power supply instability problem in the three-phase power supply system at the current moment, indicating that the power supply of the three-phase power supply system is stable and the system is stable at the current moment. Then the processor can determine that the target operating mode of the energy storage device is a three-phase power balanced distribution operating mode to perform peak-valley arbitrage.

[0034] In an embodiment of the present application, the three-phase power balanced distribution operating mode includes a current-limited three-phase power balanced distribution operating mode, which is used to reduce the output power of the energy storage device; the control method may also include: when there is a backflow phenomenon in the electric energy detection device, determining that the target operating mode of the energy storage device is the current-limited three-phase power balanced distribution operating mode.

[0035] It is understood that three-phase power balance distribution operating modes may include, but are not limited to, current-limited three-phase power balance distribution operating modes, which are used to reduce the output power of the energy storage device. Backflow occurs when the power supplied by the three-phase power supply system exceeds the power required by the user load, resulting in an oversupply.

[0036] Specifically, the processor can determine whether there is a reverse current phenomenon in the power detection device. If the power detection device has a reverse current phenomenon, it indicates that the power required by the user load is less than the power supply, resulting in an oversupply. In this case, the processor needs to control the output power of the energy storage device, that is, determine the target operating mode of the energy storage device to be the current-limited three-phase power balanced distribution operating mode, reduce the output power of the energy storage device, avoid the reverse current phenomenon of the power detection device, ensure the normal power supply of the three-phase power supply system, and protect the normal operation of the equipment in the three-phase power supply system.

[0037] In an embodiment of the present application, the three-phase power balanced distribution operation mode includes a non-current-limited three-phase power balanced distribution operation mode, which is used to maintain the output power of the energy storage device. The control method may also include: when there is no backflow phenomenon in the electric energy detection device, determining that the target operation mode of the energy storage device is the non-current-limited three-phase power balanced distribution operation mode.

[0038] It is understandable that the three-phase power balanced distribution operation mode may also include but is not limited to a non-current-limited three-phase power balanced distribution operation mode, in which the energy storage device is controlled to output at its rated power.

[0039] Specifically, the processor can determine whether the power detection device is experiencing reverse flow. If the power detection device does not experience reverse flow, it indicates that the power required by the user load is greater than or equal to the power supply. At this point, the processor controls the output power of the energy storage device to its rated power, i.e., determines the target operating mode of the energy storage device to be a non-current-limited three-phase power balanced distribution operating mode, ensuring normal power output from the energy storage device, meeting the power requirements of the user load and ensuring normal power supply of the three-phase power supply system.

[0040] In an embodiment of the present application, the control method may further include: controlling the energy storage device to operate in a three-phase power unbalanced distribution operation mode for a preset time period.

[0041] It can be understood that the preset duration is a pre-set duration, such as 2 hours.

[0042] Specifically, the processor determines that the target operating mode of the energy storage device is the three-phase unbalanced power distribution operating mode when any one of the voltage imbalance, current imbalance, and transformer load rate is greater than or equal to the corresponding preset threshold value. After controlling the energy storage device to operate in the three-phase unbalanced power distribution operating mode for a preset period of time, the processor may again obtain the voltage imbalance, current imbalance, and transformer load rate to determine whether the voltage imbalance, current imbalance, and transformer load rate are all less than the corresponding preset threshold value. If any one of the voltage imbalance, current imbalance, and transformer load rate is greater than or equal to the corresponding preset threshold value, the processor again controls the energy storage device to operate in the three-phase unbalanced power distribution operating mode for a preset period of time; and if the voltage imbalance, current imbalance, and transformer load rate are all less than the corresponding preset threshold value, the processor again controls the energy storage device to operate in the three-phase balanced power distribution operating mode.

[0043] The processor of the above technical solution controls the energy storage device to operate in a three-phase power unbalanced distribution operation mode for a preset period of time, which can avoid the three-phase power supply system from switching the operation mode multiple times in a short period of time, so that the three-phase power supply system can make system adjustments within the preset period of time, thereby ensuring the power supply stability of the three-phase power supply system.

[0044] In an embodiment of the present application, determining the voltage imbalance, current imbalance and transformer load rate of the three-phase power supply system based on the three-phase current and the three-phase voltage may include: determining the voltage imbalance of the three-phase power supply system based on the three-phase voltage, wherein the voltage imbalance is the ratio of the three-phase voltage difference between the maximum and the minimum of the three-phase voltage to the three-phase voltage average of the three-phase voltage; determining the current imbalance of the three-phase power supply system based on the three-phase current, wherein the current imbalance is the ratio of the three-phase current difference between the maximum and the minimum of the three-phase current to the three-phase current average of the three-phase current; determining the transformer load rate of the transformer based on the three-phase voltage and the three-phase current, wherein the transformer load rate is the ratio of the sum of the products of the three-phase current and the corresponding three-phase voltage to the rated capacity of the transformer.

[0045] Specifically, the processor obtains the three-phase voltages (Ua, Ub, and Uc) and three-phase currents (Ia, Ib, and Ic) detected by the electric energy detection device, and determines the maximum voltage Umax, the minimum voltage Umin, and the average of the three-phase voltages (Ua, Ub, and Uc), and the maximum current Imax, the minimum current Imin, and the average of the three-phase currents (Ia, Ib, and Ic). Based on this, the processor can determine the voltage imbalance of the three-phase power supply system based on the maximum voltage Umax, the minimum voltage Umin, and the average of the three-phase voltages. The voltage imbalance is the ratio of the three-phase voltage difference between the maximum (maximum voltage) and the minimum (minimum voltage) of the three-phase voltages to the average of the three-phase voltages. The processor can also determine the current imbalance of the three-phase power supply system based on the maximum current Imax, the minimum current Imin, and the average of the three-phase currents. The current imbalance is the ratio of the three-phase current difference between the maximum and minimum of the three-phase currents to the average of the three-phase currents. In addition, the processor can also obtain the rated capacity of the transformer, and thus determine the transformer load rate of the transformer based on the three-phase voltage and three-phase current. The transformer load rate is the ratio of the sum of the products of the three-phase current and the corresponding three-phase voltage to the rated capacity of the transformer.

[0046] In a specific embodiment, Figure 2 As shown, the energy storage device is arranged in a three-phase power supply system, which also includes a transformer (such as Figure 2 transformers in the substation) and power detection devices (such as Figure 2 The electric energy detection device and the energy storage device are arranged on the low voltage side of the transformer, and the electric energy detection device is arranged between the transformer and the energy storage device. The three-phase power supply system may also include a power grid, a photovoltaic power supply system (such as Figure 2 The photovoltaic system in the three-phase power supply system) and user loads. Specifically, the high-voltage power of the power grid is converted into low-voltage power by a transformer and supplied to the user load. The power detection device is used to detect the power (three-phase current, three-phase voltage, and three-phase power) flowing through the power detection device. The energy storage device is used to store or supply power. The photovoltaic power supply system is used to convert new energy (light energy) into electricity and then supply power to the user load. Among them, the reverse flow phenomenon that occurs in the power detection device in the three-phase power supply system is a phenomenon in which the power supplied by the photovoltaic power supply system and the energy storage device is too much, causing the excess power to flow into the grid.

[0047] like Figure 3 As shown, the processor collects the three-phase current of the low-voltage side of the transformer through the power detection device (such as Figure 3 Current data) and three-phase voltage (such as Figure 3The voltage data of the three-phase current and three-phase voltage are uploaded to the Energy Management System (EMS) by means of limited or wireless communication, and the processor (such as Figure 3 The EMS) processes the three-phase current and three-phase voltage to determine the voltage imbalance, current imbalance and transformer load rate of the three-phase power supply system, and determines the voltage imbalance of the three-phase power supply system , current imbalance and the transformer load factor of the transformer Whether the three-phase power unbalanced distribution operation mode is met (such as Figure 3 The starting condition of the three-phase power unbalanced distribution operation mode is that any one of the voltage imbalance, current imbalance and transformer load rate is greater than or equal to the corresponding preset threshold. The processor can preset the preset threshold corresponding to the voltage imbalance as 2%, the preset threshold corresponding to the current imbalance as 10% and the preset threshold corresponding to the transformer load rate as 80%. 2% or This indicates that there is a three-phase imbalance problem in the three-phase power supply system. In 80% of cases, it indicates that the transformer of the three-phase power supply system is overloaded (80%≤ <100%) or overload problem ( 100%).

[0048] When the voltage imbalance, current imbalance and transformer load rate of the three-phase power supply system meet the three-phase power unbalanced distribution operation mode (such as Figure 3 When the starting conditions of the energy storage operation mode of the substation are met, the processor controls the energy storage device to operate in the three-phase power unbalanced distribution operation mode for a preset time (for example, 2 hours). When the voltage unbalance, current unbalance and transformer load rate of the three-phase power supply system meet the requirements of the three-phase power unbalanced distribution operation mode (for example, Figure 3 When the starting conditions of the substation energy storage operation mode are met, the processor controls the energy storage device to operate in the three-phase power balanced distribution operation mode, wherein the three-phase power balanced distribution operation mode includes the current-limited three-phase power balanced distribution operation mode and the non-current-limited three-phase power balanced distribution operation mode. Specifically, the processor determines whether there is a reverse flow phenomenon in the electric energy detection device. When the electric energy detection device has a reverse flow phenomenon, the processor determines that the target operation mode of the energy storage device is the current-limited three-phase power balanced distribution operation mode; when the electric energy detection device does not have a reverse flow phenomenon, the processor determines that the target operation mode of the energy storage device is the non-current-limited three-phase power balanced distribution operation mode.

[0049] In the above technical solution, the processor determines whether the three-phase power supply system is unstable by calculating and processing the three-phase current and three-phase voltage, thereby further determining the target operating mode of the energy storage device and realizing automatic control of the target operating mode of the energy storage device. Under the premise of ensuring the stability of the three-phase power supply system (power quality), the benefits of the energy storage device are improved.

[0050] An embodiment of the present application also provides a control device for the operating mode of an energy storage device, which may include: a memory configured to store instructions; and a processor configured to call the instructions from the memory and to implement the above-mentioned control method for the operating mode of the energy storage device when executing the instructions.

[0051] An embodiment of the present application also provides a three-phase power supply system, which may include: a transformer; an energy storage device, arranged on the low-voltage side of the transformer; an electric energy detection device, arranged on the low-voltage side of the transformer, located between the transformer and the energy storage device; and a control device for the operating mode of the energy storage device according to the above.

[0052] An embodiment of the present application further provides a machine-readable storage medium having instructions stored thereon, the instructions being used to enable a machine to execute the above-mentioned control method for the operating mode of the energy storage device.

[0053] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0054] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0055] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0056] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0057] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0058] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0059] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can be implemented using any method or technology for information storage. Information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase-change RAM (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices, or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media, such as modulated data signals and carrier waves.

[0060] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0061] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A control method for an energy storage device operating mode, characterized in that: The energy storage device is provided in a three-phase power supply system, the three-phase power supply system further comprising a transformer and an electric energy detection device, the electric energy detection device and the energy storage device are provided on a low-voltage side of the transformer, and the electric energy detection device is provided between the transformer and the energy storage device, and the control method comprises: Acquire the three-phase current and three-phase voltage corresponding to the low-voltage side of the transformer in the three-phase power supply system detected by the electric energy detection device; determining a voltage imbalance, a current imbalance, and a transformer load factor of the three-phase power supply system according to the three-phase current and the three-phase voltage; determining a target operating mode of the energy storage device according to the voltage imbalance, the current imbalance, and the transformer load rate; The operation mode of the energy storage device is controlled to be the target operation mode.

2. The control method according to claim 1, characterized in that: The target operating mode includes a three-phase power unbalanced distribution operating mode, and determining the target operating mode of the energy storage device according to the voltage imbalance, the current imbalance, and the transformer load rate includes: When any one of the voltage imbalance, the current imbalance, and the transformer load rate is greater than or equal to the corresponding preset threshold, the target operation mode of the energy storage device is determined to be a three-phase power unbalanced distribution operation mode.

3. The control method according to claim 1, wherein: The target operating mode includes a three-phase power balanced distribution operating mode, and determining the target operating mode of the energy storage device according to the voltage imbalance, the current imbalance, and the transformer load rate includes: When the voltage imbalance, the current imbalance, and the transformer load rate are all smaller than corresponding preset thresholds, the target operation mode of the energy storage device is determined to be the three-phase power balanced distribution operation mode.

4. The control method according to claim 3, characterized in that: The three-phase power balanced distribution operation mode includes a current-limited three-phase power balanced distribution operation mode, and the current-limited three-phase power balanced distribution operation mode is used to reduce the output power of the energy storage device; the control method further includes: In the case where a reverse flow phenomenon exists in the electric energy detection device, the target operation mode of the energy storage device is determined to be the current-limited three-phase power balanced distribution operation mode.

5. The control method according to claim 3, characterized in that: The three-phase power balanced distribution operation mode includes a non-current-limited three-phase power balanced distribution operation mode, and the non-current-limited three-phase power balanced distribution operation mode is used to maintain the output power of the energy storage device. The control method further includes: In the case that there is no reverse flow phenomenon in the electric energy detection device, the target operation mode of the energy storage device is determined to be the non-current-limited three-phase power balanced distribution operation mode.

6. The control method according to claim 2, characterized in that: The control method further includes: The energy storage device is controlled to operate in the three-phase power unbalanced distribution operation mode for a preset time period.

7. The control method according to claim 1, characterized in that: The determining, based on the three-phase current and the three-phase voltage, the voltage imbalance, the current imbalance, and the transformer load rate of the transformer of the three-phase power supply system includes: Determining a voltage imbalance of the three-phase power supply system based on the three-phase voltages, wherein the voltage imbalance is a ratio of a three-phase voltage difference between a maximum and a minimum of the three-phase voltages to a three-phase voltage average of the three-phase voltages; Determining a current imbalance of the three-phase power supply system based on the three-phase currents, wherein the current imbalance is a ratio of a three-phase current difference between a maximum current and a minimum current of the three-phase currents to a three-phase current average of the three-phase currents; The transformer load rate of the transformer is determined according to the three-phase voltage and the three-phase current, wherein the transformer load rate is a ratio of a sum of products of the three-phase current and the corresponding three-phase voltage to a rated capacity of the transformer.

8. A control device for an energy storage device operating mode, characterized in that: include: a memory configured to store instructions; as well as A processor is configured to call the stored instructions from the memory and implement the control method for the operation mode of the energy storage device according to any one of claims 1 to 7 when executing the stored instructions.

9. A three-phase power supply system, characterized in that: include: transformer; an energy storage device, arranged on the low-voltage side of the transformer; an electric energy detection device, arranged on the low-voltage side of the transformer and located between the transformer and the energy storage device; The control device for the operating mode of the energy storage device according to claim 8.

10. A machine-readable storage medium, characterized in that The machine-readable storage medium stores instructions for causing a machine to execute the control method for an energy storage device operating mode according to any one of claims 1 to 7.

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