Discharge adjusting method and device of energy storage system, electronic terminal and storage medium

Abstract

The invention relates to the technical field of energy storage, in particular to a discharge adjustment method and device of an energy storage system, an electronic terminal and a storage medium, and the discharge adjustment method comprises the steps: obtaining the output power of a power grid end and the output power of a battery end in real time; at the initial discharge moment, the EMS issues first preset discharge power to the PCS, and the PCS adjusts discharge output power according to the first preset discharge power; after the PCS outputs the power, whether the output power of the power grid end at the current moment is smaller than the first margin value or not is judged, the output power of the battery end is periodically adjusted according to the judgment result, countercurrent can be prevented, and oscillation is avoided.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a discharge regulation method, device, electronic terminal and storage medium of an energy storage system. Background Art

[0002] With the continuous growth of global energy demand and the urgent need for the use of renewable energy, the energy storage system has become increasingly important in the modern energy system. As a device that can store electrical energy and release it when needed, the energy storage system plays a key role in balancing energy supply and demand, improving energy utilization efficiency, and ensuring the stable operation of the power grid.

[0003] In the energy storage system, the energy management system (EMS) is used to comprehensively monitor, control and optimize the operation of the entire energy storage system; the power conversion system (PCS) is used to realize the bidirectional conversion between AC and DC on the one hand, and on the other hand, PCS is also used to regulate and control the output power. At the same time, PCS can flexibly adjust its conversion power according to the instructions of EMS to adapt to different working scenarios and needs.

[0004] In commercial energy storage systems, the battery end stores electricity by shaving peak power and filling valleys. In order to maximize profits, it is necessary to increase the utilization rate of the battery end as much as possible. However, when the output power of the battery end is greater than the load, there is a risk that the power at the battery end will flow back to the grid.

[0005] Therefore, the Chinese patent application with publication number CN117335477A discloses a bidirectional charging and discharging system and its control method, equipment and medium, including obtaining the electric energy data of the load at the power consumption end and the electric energy data output by the bidirectional charging and discharging system. When it is judged that reverse current occurs in the power grid and the reverse current power of the power grid is greater than the allowable reverse current power of the power grid, the discharge power output by the bidirectional charging and discharging system is reduced.

[0006] However, the above technical solution can only adjust the output power after the reverse current is generated, and cannot prevent the reverse current from occurring. Secondly, the above solution is a follow-up adjustment strategy. First, the system adjustment control quantity cannot be accurately estimated, so there is no margin for preventing the reverse current, which can easily cause system instability; second, due to the PCS working characteristics and inherent characteristics such as the overall system communication and control delay, real-time adjustment will cause the power conversion circuit to oscillate, thereby affecting the system stability and device life. Summary of the invention

[0007] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a discharge regulation method, device, electronic terminal and storage medium for an energy storage system to periodically regulate the output power of the battery end, prevent the generation of reverse current and avoid oscillation.

[0008] In order to achieve the above purpose / solve the above technical problems, the present invention is implemented by adopting the following technical solutions: In a first aspect, the present invention provides a discharge regulation method for an energy storage system, wherein the energy storage system comprises a battery terminal, the battery terminal is electrically connected to a power grid terminal, the battery terminal and the power grid terminal are used to output electric energy to a load terminal, and the discharge regulation method comprises: Obtain the output power of the grid and the battery in real time; At the initial discharge moment, the EMS system sends a first preset discharge power to the PCS, and the PCS adjusts the discharge output power according to the first preset discharge power; After the PCS outputs power, it is determined whether the output power of the grid end is less than the first margin value at the current moment, and the output power of the battery end is periodically adjusted according to the determination result.

[0009] In combination with the first aspect, optionally, the first preset discharge power is the output power of the grid minus the second margin value.

[0010] In combination with the first aspect, optionally, the PCS adjusting the discharge output power according to the first preset discharge power includes: When the first preset discharge power is less than or equal to zero, the PCS is in standby mode; When the first preset discharge power is greater than zero and less than the first limit power, the PCS performs discharge output according to the first preset discharge power; When the first preset discharge power is greater than the first limit power, the PCS performs discharge output according to the first limit power.

[0011] In combination with the first aspect, optionally, the second margin value is greater than the first margin value, the first margin value is 8KW, and the second margin value is 10KW.

[0012] In combination with the first aspect, optionally, after the PCS outputs power, determining whether the output power of the grid end at the current moment is less than the first margin value, and periodically adjusting the output power of the battery end according to the determination result includes: If the output power of the grid at the current moment is less than the first margin value, the EMS system immediately controls the PCS to reduce the output power of the battery in the current cycle, so that the output power of the grid at the next moment remains greater than the second margin value; If the output power of the grid at the current moment is greater than or equal to the first margin value, the EMS system controls the PCS to adjust the output power of the battery in the next cycle so that the output power of the grid at the next moment remains greater than the second margin value.

[0013] In combination with the first aspect, optionally, the EMS system immediately controls the PCS to reduce the output power of the battery terminal in the current cycle, wherein the output power value of the battery terminal in the current cycle is adjusted to the output power of the battery terminal at the previous moment plus the output power of the grid terminal at the current moment minus the output power of the grid terminal at the previous moment; the EMS system controls the PCS to adjust the output power of the battery terminal in the next cycle, wherein the output power value of the battery terminal in the next cycle is adjusted to the output power of the battery terminal at the previous moment plus the output power of the grid terminal at the current moment minus the output power of the grid terminal at the previous moment.

[0014] In a second aspect, the present invention provides a discharge regulating device for an energy storage system, the device comprising: Power acquisition module: used to obtain the output power of the grid and the output power of the battery in real time; The first regulating module is used for, at the initial discharge moment, the EMS system sends the first preset discharge power to the PCS, and the PCS regulates the discharge output power according to the magnitude of the first preset discharge power; The second adjustment module is used to determine whether the output power of the grid end is less than the first margin value at the current moment after the PCS outputs power, and to periodically adjust the output power of the battery end according to the determination result.

[0015] In a third aspect, the present invention provides an electronic terminal, comprising a processor and a memory connected to the processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the method described in any one of the first aspects are performed.

[0016] In a fourth aspect, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any one of the methods described in the first aspect.

[0017] In a fifth aspect, the present invention provides a computer program product, comprising a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention effectively prevents the occurrence of the reverse flow phenomenon by setting the margin value and implementing the dual mechanism of periodic adjustment, thereby ensuring a better prevention effect. In addition, the above method can effectively avoid the oscillation problem that may be caused by the traditional follow-up adjustment strategy.

[0019] 2. The present invention sets a double margin value, uses the second margin value as a basic limit, and adds a first margin value based on the second margin value to reduce the frequency of frequent switching of the system. The system only intervenes immediately when the margin triggers the warning value, thereby achieving the purpose of reducing oscillation while ensuring system stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the energy storage system of the present invention; Figure 2 It is a diagram of the internal structure of the electronic terminal in Example 3 of the present invention. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present application and the specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations on the technical solution of the present application. In the absence of conflict, the embodiments of the present application and the technical features in the embodiments can be combined with each other.

[0022] In the description of the present invention, if “first” or “second” is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0024] Embodiment 1:

[0025] The first embodiment provides a discharge regulation method for an energy storage system. The method can be applied to a terminal and can be executed by a discharge regulation device for the energy storage system. The device can be implemented by software and / or hardware and can be integrated in the terminal.

[0026] like Figure 1 As shown, the energy storage system disclosed in the first embodiment includes a battery end, which is electrically connected to a power grid end, and the battery end and the power grid end are used to output electric energy to a load end.

[0027] The method of this implementation specifically includes the following steps: Step 1: Obtain the output power of the grid and the output power of the battery in real time; In some embodiments, the output power P1 of the grid end is obtained in real time by installing an anti-backflow meter on the grid side, and the output power P2 of the battery end is obtained in real time by installing a meter on the battery side. The required power of the load is Px; the required power Px of the load is unknown, but at any time, P1+P2=Px is followed.

[0028] Then at the current moment, the load demand power is Px(t), the grid output power is P1(t), and the battery output power is P2(t); At the previous moment, the required power of the load is Px(t-1), the output power of the grid is P1(t-1), and the output power of the battery is P2(t-1).

[0029] In some embodiments, the time difference from the previous moment to the current moment can be freely adjusted according to system requirements, and no excessive restrictions are made here. In this embodiment, the time difference from the previous moment to the current moment is regarded as a cycle.

[0030] Step 2: Initial discharge time, at the initial discharge time P2=0, the EMS system sends the first preset discharge power to the PCS, and the PCS adjusts the discharge output power according to the size of the first preset discharge power; In some embodiments, the first preset discharge power is the output power of the grid minus the second margin value. In one embodiment, the second margin value is 10KW, that is, the first preset discharge power is P1-10KW.

[0031] The PCS adjusts the discharge output power according to the first preset discharge power, including: When the first preset discharge power is less than or equal to zero, that is, when P1-10≤0, the PCS is in standby mode; When the first preset discharge power is greater than zero and less than the first limit power, the first limit power is set according to the energy storage system, and can be specifically set to the rated output power of the PCS used by the current system. In one embodiment, the first limit power is 115KW, that is, when 0<P1-10≤115KW, the PCS discharges and outputs according to the first preset discharge power; When the first preset discharge power is greater than the first limit power, the PCS discharges and outputs according to the first limit power. In one embodiment, the first limit power is 115KW, that is, when 115KW<P1-10, the PCS discharges and outputs according to 115KW.

[0032] Step 3: After the PCS outputs power, it is determined whether the output power of the grid at the current moment is less than the first margin value, and the output power of the battery is periodically adjusted according to the determination result; after the step 2 is completed, the PCS has power output. Since P1+P2=Px at any moment, the size of P1 is adjusted to Px-P2 at this time. Within one cycle, the size of P1 follows the change of Px.

[0033] In a real-time example, the first margin value is 8KW; in the first embodiment, the second margin value needs to be larger than the first margin value, which can be used to prevent oscillation; in the present embodiment, this scheme is used to set a double margin value, the second margin value is used as a basic limit, and the first margin value is added on the basis of the second margin value to reduce the frequency of frequent switching of the system. The system will only intervene immediately when the margin triggers the warning value, so as to achieve the purpose of reducing oscillation while ensuring system stability.

[0034] Specifically: if the output power of the grid at the current moment is less than the first margin value, the EMS system immediately controls the PCS to reduce the output power of the battery in the current cycle, so that the output power of the grid at the next moment remains greater than the second margin value; in some embodiments, the output power value of the battery in the current cycle is adjusted to the output power of the battery at the previous moment plus the output power of the grid at the current moment minus the output power of the grid at the previous moment, that is, P2(t)=P2(t-1)+P1(t)-P1(t-1); If the output power of the grid at the current moment is greater than or equal to the first margin value, the EMS system controls the PCS to adjust the output power of the battery in the next cycle so that the output power of the grid at the next moment remains greater than the second margin value; in some embodiments, the output power value of the battery in the next cycle is adjusted to the output power of the battery at the previous moment plus the output power of the grid at the current moment minus the output power of the grid at the previous moment, that is, P2(t)=P2(t-1)+P1(t)-P1(t-1).

[0035] Embodiment 2:

[0036] In a second aspect, the present invention provides a discharge regulating device for an energy storage system, the device comprising: Power acquisition module: used to obtain the output power of the grid and the output power of the battery in real time; The first regulating module is used for, at the initial discharge moment, the EMS system sends the first preset discharge power to the PCS, and the PCS regulates the discharge output power according to the magnitude of the first preset discharge power; The second adjustment module is used to determine whether the output power of the grid end is less than the first margin value at the current moment after the PCS outputs power, and to periodically adjust the output power of the battery end according to the determination result.

[0037] The discharge regulating device of the energy storage system provided in the embodiment of the present invention can execute the discharge regulating method of the energy storage system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0038] Embodiment three:

[0039] The embodiment of the present invention further provides an electronic terminal, which may be a server, and its internal structure diagram may be as shown in FIG. Figure 2 As shown. The electronic terminal includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the electronic terminal is used to provide computing and control capabilities. The memory of the electronic terminal includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the electronic terminal is used to store data acquired and generated in the discharge regulation method of the energy storage system. The input / output interface of the electronic terminal is used to exchange information between the processor and an external device. The communication interface of the electronic terminal is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, the method of the aforementioned embodiment one is implemented.

[0040] Those skilled in the art will understand that Figure 2 The structure shown in the figure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the electronic terminal to which the scheme of the present application is applied. The specific electronic terminal may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0041] The electronic terminal provided in the embodiment of the present invention can execute the discharge regulation method of the energy storage system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0042] Embodiment 4:

[0043] The embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the method steps described in the first embodiment are implemented.

[0044] The discharge regulating device of the energy storage system provided in the embodiment of the present invention can execute the discharge regulating method of the energy storage system provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0045] 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 adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0046] 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 box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0047] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate 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 A function specified in one or more boxes.

[0048] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A discharge regulation method for an energy storage system, characterized in that: The energy storage system includes a battery terminal, the battery terminal is electrically connected to a power grid terminal, the battery terminal and the power grid terminal are used to output electric energy to a load terminal, and the discharge regulation method includes: Obtain the output power of the grid and the battery in real time; At the initial discharge moment, the EMS system sends a first preset discharge power to the PCS, and the PCS adjusts the discharge output power according to the first preset discharge power; After the PCS outputs power, it is determined whether the output power of the grid end is less than the first margin value at the current moment, and the output power of the battery end is periodically adjusted according to the determination result.

2. The discharge regulation method of the energy storage system according to claim 1, characterized in that: The first preset discharge power is the output power of the grid minus the second margin value.

3. The discharge regulation method of the energy storage system according to claim 1, characterized in that: The PCS adjusting the discharge output power according to the first preset discharge power includes: When the first preset discharge power is less than or equal to zero, the PCS is in standby mode; When the first preset discharge power is greater than zero and less than the first limit power, the PCS performs discharge output according to the first preset discharge power; When the first preset discharge power is greater than the first limit power, the PCS performs discharge output according to the first limit power.

4. The discharge regulation method of the energy storage system according to claim 2, characterized in that: The second margin value is greater than the first margin value.

5. The discharge regulation method of the energy storage system according to claim 1, characterized in that: After the PCS outputs power, determining whether the output power of the grid end at the current moment is less than the first margin value, and periodically adjusting the output power of the battery end according to the determination result includes: If the output power of the grid at the current moment is less than the first margin value, the EMS system immediately controls the PCS to reduce the output power of the battery in the current cycle, so that the output power of the grid at the next moment remains greater than the second margin value; If the output power of the grid at the current moment is greater than or equal to the first margin value, the EMS system controls the PCS to adjust the output power of the battery in the next cycle so that the output power of the grid at the next moment remains greater than the second margin value.

6. The discharge regulation method of the energy storage system according to claim 5, characterized in that: The EMS system immediately controls the PCS to reduce the output power of the battery end in the current cycle, wherein the output power value of the battery end in the current cycle is adjusted to the output power of the battery end at the previous moment plus the output power of the grid end at the current moment minus the output power of the grid end at the previous moment; the EMS system controls the PCS to adjust the output power of the battery end in the next cycle, wherein the output power value of the battery end in the next cycle is adjusted to the output power of the battery end at the previous moment plus the output power of the grid end at the current moment minus the output power of the grid end at the previous moment.

7. A discharge regulating device for an energy storage system, characterized in that: The device comprises: Power acquisition module: used to obtain the output power of the grid and the output power of the battery in real time; The first regulating module is used for, at the initial discharge moment, the EMS system sends the first preset discharge power to the PCS, and the PCS regulates the discharge output power according to the magnitude of the first preset discharge power; The second adjustment module is used to determine whether the output power of the grid end is less than the first margin value at the current moment after the PCS outputs power, and to periodically adjust the output power of the battery end according to the determination result.

8. An electronic terminal, characterized in that: The method comprises a processor and a memory connected to the processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the steps of the method according to any one of claims 1 to 6 are executed.

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

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