Digital twin construction method for energy storage valve grid-connected system, and related apparatus

Abstract

The present application relates to the technical field of power systems, and discloses a digital twin construction method for an energy storage valve grid-connected system, and a related apparatus. The digital twin construction method for an energy storage valve grid-connected system comprises: acquiring system data and an operation state of an energy storage valve grid-connected system, wherein the system data comprises data information of each element in the energy storage valve grid-connected system; acquiring a data file of a real time digital simulator simulation model corresponding to the energy storage valve grid-connected system; establishing a relational data table between the system data and each element in the data file; updating the data file on the basis of the relational data table to import the system data into the real time digital simulator simulation model; and sending the operation state to the real time digital simulator simulation model to obtain the real time digital simulator simulation model serving as a digital twin of the energy storage valve grid-connected system. Thus, the actual state of an energy storage valve grid-connected system can be simulated in real time, and the actual state of the energy storage valve grid-connected system can be sensed in real time.

Description

Digital twin construction method and related devices for energy storage valve grid-connected system

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311686273.1 filed on December 8, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of power systems, and in particular to a method for constructing a digital twin of an energy storage valve grid-connected system and related devices. Background Art

[0004] With the development of new power systems, grid-connected energy storage systems are becoming increasingly widespread and playing an increasingly important role. As a new type of grid-connected energy storage system, the energy storage valve-based grid-connected energy storage system (hereinafter referred to as the energy storage valve grid-connected system) features a relatively high voltage level and large capacity, playing a crucial role in supporting the stable operation of the power grid.

[0005] However, the current simulation test system of the energy storage valve grid-connected system cannot perceive the actual state of the energy storage valve grid-connected system in real time. Summary of the Invention

[0006] In view of the above problems, the present application provides a digital twin construction method and related devices for an energy storage valve grid-connected system, aiming to solve the technical problem of being unable to perceive the actual state of the energy storage valve grid-connected system in real time.

[0007] In the first aspect, an embodiment of the present application provides a method for constructing a digital twin of an energy storage valve grid-connected system, including: obtaining system data and operating status of the energy storage valve grid-connected system, the system data including data information of each component in the energy storage valve grid-connected system; obtaining a data file of a real-time digital simulator (RTDS) simulation model corresponding to the energy storage valve grid-connected system; establishing a relational data table between the system data and each component in the data file; updating the data file according to the relational data table to import the system data into the real-time digital simulator simulation model; sending the operating status to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

[0008] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application imports the system data and operating status of the energy storage valve grid-connected system into the real-time digital simulator simulation model, so that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site, and the operating status of the real-time digital simulator simulation model is consistent with the actual operating status of the energy storage valve grid-connected system on site. The real-time digital simulator simulation model realizes a 1:1 equivalent simulation of the actual energy storage valve grid-connected system on site, thereby obtaining a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, also known as a mirror virtual system of the energy storage valve grid-connected system; the real-time digital simulator simulation model can simulate the actual state of the energy storage valve grid-connected system in real time. Therefore, the real-time digital simulator simulation model can perceive the actual state of the energy storage valve grid-connected system in real time, thereby timely warning the operating risks of the energy storage valve grid-connected system and ensuring the safe and stable operation of the power grid. The mirror virtual system of the energy storage valve grid-connected system can also be called the digital twin of the energy storage valve grid-connected system.

[0009] In some embodiments, establishing a relational data table between system data and various elements in a data file includes: establishing an index corresponding to the system data; and establishing a relational data table between the system data and various elements in the data file based on the index.

[0010] The embodiment of the present application can establish a relational data table between system data and various components in the data file of the real-time digital simulator simulation model based on the index, so that the establishment of the relational data table is more convenient and accurate.

[0011] In some embodiments, after updating the data file according to the relational data table to import the system data into the real-time digital simulator simulation model, it also includes: when the system data changes, updating the relational data table according to the changed system data; updating the data file according to the updated relational data table to import the changed system data into the real-time digital simulator simulation model.

[0012] In the embodiment of the present application, when the system data changes, the relational data table can be updated first, and then the data file can be updated according to the updated relational data table to import the changed system data into the real-time digital simulator simulation model, so that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site.

[0013] In some embodiments, the energy storage valve grid-connected system includes a power grid and an energy storage system, the energy storage system includes a converter and an energy storage valve; the system data includes power grid data, converter data and energy storage valve data; the power grid data includes data information of each component in the power grid, the converter data includes data information of each component in the converter, and the energy storage valve data includes data information of each component in the energy storage valve.

[0014] The embodiment of the present application uses grid data, converter data and energy storage valve data to construct the system data of the energy storage valve grid-connected system, making the system data of the energy storage valve grid-connected system more comprehensive, so as to better maintain the data consistency between the simulation model of the real-time digital simulator and the actual energy storage valve grid-connected system on site.

[0015] In some embodiments, the operating status includes an opening and closing status, an operating mode, and a power command.

[0016] The embodiment of the present application imports operating states such as opening and closing states, operating modes and power instructions into the real-time digital simulator simulation model, thereby making the operating state of the real-time digital simulator simulation model consistent with the actual on-site operating state of the energy storage valve grid-connected system.

[0017] In some embodiments, after sending the operating status to the real-time digital simulator simulation model to obtain the real-time digital simulator simulation model that is the digital twin of the energy storage valve grid-connected system, it also includes: running the real-time digital simulator simulation model that is the digital twin of the energy storage valve grid-connected system to analyze the operating risks of the energy storage valve grid-connected system.

[0018] The embodiment of the present application can analyze the operating risks of the energy storage valve grid-connected system based on a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, so as to timely analyze, judge and warn the operating risks of the energy storage valve grid-connected system when the operating mode of the power grid changes, thereby ensuring the safe and stable operation of the power grid.

[0019] In some embodiments, a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system is run to analyze the operational risk of the energy storage valve grid-connected system, including: based on the running real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, impedance scanning is performed on the power grid and the energy storage system in the energy storage valve grid-connected system respectively to obtain a first impedance characteristic curve corresponding to the power grid and / or a second impedance characteristic curve corresponding to the energy storage system to analyze the operational risk of the energy storage valve grid-connected system.

[0020] The embodiment of the present application can perform impedance scanning on the power grid and energy storage system in the energy storage valve grid-connected system based on a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system. When the operation mode of the power grid changes, it is convenient to timely analyze, judge and issue early warning on the operation risk of the energy storage valve grid-connected system based on the first impedance characteristic curve corresponding to the power grid and / or the second impedance characteristic curve corresponding to the energy storage system, thereby ensuring the safe and stable operation of the power grid.

[0021] In a second aspect, an embodiment of the present application provides a digital twin construction device for an energy storage valve grid-connected system, comprising: a first acquisition module, a second acquisition module, a relationship establishment module, a system data import module, and an operation status sending module. The first acquisition module is used to obtain the system data and operation status of the energy storage valve grid-connected system, where the system data includes data information of each component in the energy storage valve grid-connected system; the second acquisition module is used to obtain the data file of the real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system; the relationship establishment module is used to establish a relational data table between the system data and each component in the data file; the system data import module is used to update the data file according to the relational data table to import the system data into the real-time digital simulator simulation model; the operation status sending module is used to send the operation status to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

[0022] In a third aspect, an embodiment of the present application provides an electronic device comprising a memory and a processor, wherein the memory is used to store a computer program, and the processor is used to call the computer program to execute the above-mentioned method for constructing a digital twin of the energy storage valve grid-connected system.

[0023] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, in which a computer program or instruction is stored. When the computer program or instruction is executed, the digital twin construction method of the above-mentioned energy storage valve grid-connected system is implemented.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] FIG1 is a flow chart of a method for constructing a digital twin of an energy storage valve grid-connected system according to some embodiments of the present application;

[0027] FIG2 is a schematic diagram of the topological structure of the energy storage valve grid-connected system according to some embodiments of the present application;

[0028] FIG3 is a circuit diagram of an energy storage module in an energy storage valve grid-connected system according to some embodiments of the present application;

[0029] FIG4 is a flow chart of a method for constructing a digital twin of an energy storage valve grid-connected system according to other embodiments of the present application;

[0030] FIG5 is a flow chart of a method for constructing a digital twin of an energy storage valve grid-connected system according to some other embodiments of the present application;

[0031] FIG6 is a schematic diagram of some curves obtained after impedance scanning of the power grid and the energy storage system in the energy storage valve grid-connected system according to some embodiments of the present application;

[0032] FIG7 is a control block diagram of a current inner loop controller according to some embodiments of the present application;

[0033] FIG8 is a control block diagram of a virtual synchronization machine according to some embodiments of the present application;

[0034] FIG9 is a schematic diagram of a root locus corresponding to a virtual synchronous machine according to some embodiments of the present application;

[0035] FIG10 is a schematic structural diagram of a digital twin construction device for an energy storage valve grid-connected system according to some embodiments of the present application;

[0036] FIG11 is a schematic structural diagram of an electronic device according to some embodiments of the present application. DETAILED DESCRIPTION

[0037] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0039] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0040] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0041] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0042] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0045] At present, the simulation test system of the energy storage valve grid-connected system is an independent system from the energy storage valve grid-connected system, which makes it impossible for the simulation test system of the energy storage valve grid-connected system to obtain the actual state of the energy storage valve grid-connected system, thereby causing the simulation test system of the energy storage valve grid-connected system to be unable to perceive the actual state of the energy storage valve grid-connected system in real time.

[0046] Based on the above considerations, the embodiment of the present application proposes a digital twin construction method and related devices for the energy storage valve grid-connected system, by obtaining the system data and operating status of the energy storage valve grid-connected system, the system data includes data information of each component in the energy storage valve grid-connected system, obtaining the data file of the real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system, establishing a relational data table between the system data and each component in the data file, updating the data file according to the relational data table to import the system data into the real-time digital simulator simulation model, and sending the operating status to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

[0047] The embodiment of the present application imports the system data and operating status of the energy storage valve grid-connected system into the real-time digital simulator simulation model, so that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site, and the operating status of the real-time digital simulator simulation model is consistent with the actual operating status of the energy storage valve grid-connected system on site. The real-time digital simulator simulation model realizes a 1:1 equivalent simulation of the actual energy storage valve grid-connected system on site, thereby obtaining a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, also known as a mirror virtual system of the energy storage valve grid-connected system; the real-time digital simulator simulation model can simulate the actual state of the energy storage valve grid-connected system in real time, so the real-time digital simulator simulation model can perceive the actual state of the energy storage valve grid-connected system in real time, thereby timely warning the operating risks of the energy storage valve grid-connected system and ensuring the safe and stable operation of the power grid. The mirror virtual system of the energy storage valve grid-connected system can also be called the digital twin of the energy storage valve grid-connected system.

[0048] In order to better understand the embodiments of the present application, the digital twin construction method and related devices of the energy storage valve grid-connected system provided according to the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0049] The execution entity of the digital twin construction method of the energy storage valve grid-connected system provided in the embodiments of this application may be an electronic device, including but not limited to a personal computer, a laptop computer, a smartphone, a tablet computer, a wearable device (such as a smartwatch, a smart bracelet), etc. It should be noted that the above execution entities do not constitute a limitation on the embodiments of this application.

[0050] In some embodiments of the present application, referring to FIG1 , FIG1 is a flow chart of a method for constructing a digital twin of an energy storage valve grid-connected system according to some embodiments of the present application. The method for constructing a digital twin of an energy storage valve grid-connected system may include:

[0051] S10: Acquire system data and operating status of the energy storage valve grid-connected system, where the system data includes data information of each component in the energy storage valve grid-connected system.

[0052] The energy storage valve grid-connected system includes multiple components, and the system data of the energy storage valve grid-connected system refers to the data information of each component in the energy storage valve grid-connected system.

[0053] S20: Obtain a data file of a real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system.

[0054] The real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system runs on a real-time digital simulator platform. The real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system can generate its corresponding data file, which can be a DFX file.

[0055] S30: Establishing a relational data table between the system data and each component in the data file.

[0056] A one-to-one relational data table can be established in the database system between system data and each component in the data file of the real-time digital simulator simulation model, thereby establishing a mapping relationship between system data and each component in the data file of the real-time digital simulator simulation model.

[0057] S40: updating the data file according to the relational data table to import the system data into the simulation model of the real-time digital simulator.

[0058] After establishing a relational data table between the system data and the components in the data file, the parameters of the components in the data file can be assigned according to the relational data table to update the data file, thereby importing the system data into the real-time digital simulator simulation model. This ensures that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site.

[0059] S50: Send the operating status to the real-time digital simulator simulation model to obtain the real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

[0060] After obtaining the operating status of the energy storage valve grid-connected system, the operating status of the energy storage valve grid-connected system can be sent to the real-time digital simulator simulation model in real time using a communication network. In this way, the operating status of the real-time digital simulator simulation model can be consistent with the actual on-site operating status of the energy storage valve grid-connected system.

[0061] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application imports the system data and operating status of the energy storage valve grid-connected system into the real-time digital simulator simulation model, so that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site, and the operating status of the real-time digital simulator simulation model is consistent with the actual operating status of the energy storage valve grid-connected system on site. The real-time digital simulator simulation model realizes a 1:1 equivalent simulation of the actual energy storage valve grid-connected system on site, thereby obtaining a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, also known as a mirror virtual system of the energy storage valve grid-connected system; the real-time digital simulator simulation model can simulate the actual state of the energy storage valve grid-connected system in real time, so the real-time digital simulator simulation model can perceive the actual state of the energy storage valve grid-connected system in real time, thereby timely warning the operating risks of the energy storage valve grid-connected system and ensuring the safe and stable operation of the power grid. The mirror virtual system of the energy storage valve grid-connected system can also be called the digital twin of the energy storage valve grid-connected system.

[0062] In addition, since the system data of the energy storage valve grid-connected system is generally static data and rarely changes, a relational data table is constructed between the system data of the energy storage valve grid-connected system and the various components in the data file of the real-time digital simulator simulation model, so that the system data can be imported into the real-time digital simulator simulation model based on the relational data table, and the data import method is relatively simple; and since the operating status of the energy storage valve grid-connected system is dynamic data, its operating status may change at intervals of time, so the operating status is sent to the real-time digital simulator simulation model in real time through the communication network to improve the consistency between the operating status of the real-time digital simulator simulation model and the actual on-site operating status of the energy storage valve grid-connected system within the same time period.

[0063] In some embodiments, a storage valve grid-connected system includes a power grid and an energy storage system, wherein the energy storage system includes a converter and a storage valve. System data includes power grid data, converter data, and storage valve data. The power grid data includes data information of each component in the power grid, the converter data includes data information of each component in the converter, and the storage valve data includes data information of each component in the storage valve.

[0064] Schematically, as shown in Figure 2, the energy storage valve grid-connected system includes a power grid 110 and an energy storage system, which includes a converter 120 and an energy storage valve 130. The AC side of the converter 120 is used to connect to the power grid 110, and the DC side of the converter 120 is used to connect to the energy storage valve 130.

[0065] The converter 120 is used to convert AC power to DC power. The converter 120 can be a voltage source converter (VSC) or another type of converter. The energy storage valve 130 is used to output power or store energy.

[0066] The converter 120 includes components such as a modular multilevel converter (MMC), a converter transformer T, a lightning arrester, a disconnector, a circuit breaker, a resistor, and a reactor.

[0067] The lightning arrester may include a first lightning arrester MOA1, a second lightning arrester MOA2, a third lightning arrester MOA3, and a fourth lightning arrester MOA4 as shown in FIG2 . The isolating switch may include a first isolating switch QS1, a second isolating switch QS2, a third isolating switch QS3, a fourth isolating switch QS4, a fifth isolating switch QS5, a sixth isolating switch QS6, a seventh isolating switch QS7, an eighth isolating switch QS8, a ninth isolating switch QS9, a tenth isolating switch QS10, an eleventh isolating switch QS11, and a twelfth isolating switch QS12 as shown in FIG2 . The circuit breaker may include a first circuit breaker QF1, a second circuit breaker QF2, a third circuit breaker QF3, a fourth circuit breaker QF4, and a fifth circuit breaker QF5 as shown in FIG2 . The resistor may include a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4 as shown in FIG2 . The second resistor R2 and the third resistor R3 may also be referred to as starting resistors. The reactor may include a first reactor L1 and a second reactor L2 as shown in FIG. 2 . The first reactor L1 and the second reactor L2 may also be referred to as arm reactors.

[0068] The modular multilevel converter may include two modular multilevel converter submodules 121 as shown in FIG2 . Each modular multilevel converter submodule 121 includes a first switch Q1, a second switch Q2, and a first capacitor C1. The first switch Q1 and the second switch Q2 each include an anti-parallel diode. The first end of the first switch Q1 is connected to the first end of the first capacitor C1, the second end of the first switch Q1 is connected to the first end of the second switch Q2, and the second end of the second switch Q2 is connected to the second end of the first capacitor C1.

[0069] The energy storage valve 130 may be a DC direct-connect energy storage valve. The energy storage valve 130 may include multiple energy storage modules connected in series, such as the energy storage modules SM1, SM2, to SMn shown in FIG2 ; and further include a third reactor L3 and a fourth reactor L4 connected in series with the energy storage modules.

[0070] Each energy storage module may include a third switching tube Q3, a fourth switching tube Q4, a second capacitor C2, and an energy storage battery BAT, as shown in Figure 3. The third switching tube Q3 and the fourth switching tube Q4 each include an anti-parallel diode. The first end of the third switching tube Q3 is connected to the first end of the second capacitor C2, the second end of the third switching tube Q3 is connected to the first end of the fourth switching tube Q4, and the second end of the fourth switching tube Q4 is connected to the second end of the second capacitor C2. Furthermore, the positive electrode of the energy storage battery BAT is connected to the first end of the second capacitor C2, and the negative electrode of the energy storage battery BAT is connected to the second end of the second capacitor C2.

[0071] In actual application, the energy storage battery BAT can be switched on or off by controlling the energy storage module. Assuming that the number of energy storage modules is n, and the average voltage of the energy stored in each energy storage module is U b , then the total voltage of n energy storage modules is n×U b I dc is the DC side current, L d is the bridge arm reactance of the energy storage valve 130, and the influence of the resistance is ignored, then the DC side voltage U dc The following relationship exists:

[0072] Thus, when the DC side voltage U dc Greater than n×U b When the DC side voltage U dc Less than n×U b Therefore, the charge and discharge state of the energy storage valve 130 can be controlled by controlling the number of energy storage modules put into the energy storage valve 130.

[0073] It can be understood that the energy storage valve grid-connected system of the embodiment of the present application can be the energy storage valve grid-connected system shown in Figure 2, or it can be other energy storage valve grid-connected systems, and the embodiment of the present application is not limited to this.

[0074] In this way, the system data of the energy storage valve grid-connected system can include grid data, converter data, and energy storage valve data. Grid data primarily refers to data information about various components in the grid 110. For example, grid data can include data information about components such as generators, transformers, transmission lines, circuit breakers, and loads in the grid 110. Converter data primarily refers to data information about various components in the converter 120. For example, converter data can include data information about components such as the number of modular multilevel converter submodules 121, the first capacitor C1, the second resistor R2, the third resistor R3, the first reactor L1, the second reactor L2, and the converter transformer T. Energy storage valve data primarily refers to data information about various components in the energy storage valve 130. For example, energy storage valve data can include data information about components such as the number of energy storage modules, the second capacitor C2, the third reactor L3, and the fourth reactor L4.

[0075] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application constructs the system data of the energy storage valve grid-connected system through power grid data, converter data and energy storage valve data, making the system data of the energy storage valve grid-connected system more comprehensive, so as to better maintain the data consistency between the simulation model of the real-time digital simulator and the actual energy storage valve grid-connected system on site.

[0076] In some embodiments, the operating status includes an opening and closing status, an operating mode, and a power command.

[0077] The operating status of the energy storage valve grid-connected system includes the opening and closing status, operating mode, and power instructions. The opening and closing status refers to the opening and closing status of each circuit breaker and each disconnector in the energy storage valve grid-connected system. The operating mode refers to the operating mode of the energy storage valve grid-connected system, including the operating mode of equipment such as the energy storage valve 130 and the converter 120, such as the constant DC voltage operating mode, the constant DC current operating mode, and the constant power operating mode. The power instruction refers to the power adjustment instruction issued by the operator, such as the charge / discharge power instruction of the energy storage valve grid-connected system.

[0078] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application imports operating states such as opening and closing states, operating modes and power instructions into the real-time digital simulator simulation model, thereby making the operating state of the real-time digital simulator simulation model consistent with the actual on-site operating state of the energy storage valve grid-connected system.

[0079] In some embodiments, referring to FIG. 4 , the step S30 may specifically include:

[0080] S31: Create an index corresponding to the system data.

[0081] Corresponding indexes can be established for all system data of the energy storage valve grid-connected system, and all system data and their corresponding indexes can be stored in a database system to manage the system data.

[0082] S32: Based on the index, a relational data table is established between the system data and each component in the data file.

[0083] The data file of the real-time digital simulator model defines the attribute information of each component in the energy storage valve grid-connected system. For example, the data file of the real-time digital simulator model defines the index number (DRAFT_UNIQUEID), name (Name), and related parameter information of each component.

[0084] Based on the correspondence between the index corresponding to the system data and the index number in the data file of the real-time digital simulator simulation model, a relational data table with one-to-one correspondence between the system data and the various components in the data file of the real-time digital simulator simulation model can be established in the database system, thereby establishing a mapping relationship between the system data and the various components in the data file of the real-time digital simulator simulation model.

[0085] Taking the power supply element of the energy storage valve grid-connected system as an example, the relational schema for the power supply element is defined as Source. Its attribute information includes the index number (DRAFT_UNIQUEID), name (Name), power supply internal resistance (R), power supply internal reactance (L), and power supply phase number (nmbr). The index number is the primary key attribute. Therefore, the relational data table corresponding to the power supply element can be shown in Table 1 below:

[0086] Table 1

[0087] Among them, the index numbers of different power supply components are 1200, 1302 and 1401 respectively. The power supply component with index number 1200 can be named SCR1, the power supply component with index number 1302 can be named SCR2, and the power supply component with index number 1401 can be named SCR3.

[0088] Therefore, according to the above method, for each component in the energy storage valve grid-connected system, such as transformers, disconnectors, circuit breakers, etc., a relational data table corresponding to each component is established, and then a relational data table of the real-time digital simulator simulation model of the entire energy storage valve grid-connected system is established. The relational model of the real-time digital simulator simulation model of the energy storage valve grid-connected system is defined as Model, and its attribute information includes the index number (DRAFT_UNIQUEID) and name (Name) of each component. Therefore, the relational data table of the real-time digital simulator simulation model of the energy storage valve grid-connected system can be shown in Table 2 below:

[0089] Table 2

[0090] The index numbers of different circuit breakers are 1005, 1034, and 2308, respectively. The circuit breaker with index number 1005 may be named Breaker1, the circuit breaker with index number 1034 may be named Breaker2, and the circuit breaker with index number 2308 may be named Breaker3.

[0091] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application can establish a relational data table between the system data and the various components in the data file of the real-time digital simulator simulation model based on the index, so as to make the establishment of the relational data table more convenient and accurate.

[0092] In some embodiments, after the above step S40, it also includes: when the system data changes, updating the relational data table according to the changed system data; updating the data file according to the updated relational data table to import the changed system data into the real-time digital simulator simulation model.

[0093] When the system data of the energy storage valve grid-connected system changes, that is, when the parameters of certain components in the energy storage valve grid-connected system change, the data in the relational data table can be updated first according to the changed system data, and then the parameters of each component in the data file can be assigned according to the updated relational data table to update the data file, so that the real-time digital simulator simulation model can refresh the parameters of each component in the real-time digital simulator simulation model according to the updated data file to realize the import of the changed system data into the real-time digital simulator simulation model, so that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site.

[0094] The system data for a accumulator valve grid-connected system is generally static and rarely changes. Therefore, after initially importing the system data into the real-time digital simulator model, subsequent changes to the system data require only the modified data to be modified, while the remaining system data can remain unchanged.

[0095] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application can first update the relational data table when the system data changes, and then update the data file according to the updated relational data table to import the changed system data into the real-time digital simulator simulation model, so that the real-time digital simulator simulation model maintains data consistency with the actual energy storage valve grid-connected system on site.

[0096] In some embodiments, referring to FIG. 5 , after the above step S50, the following steps are further included:

[0097] S60: Run the real-time digital simulator model of the digital twin of the energy storage valve grid-connected system to analyze the operational risks of the energy storage valve grid-connected system.

[0098] After importing the system data and operating status of the energy storage valve grid-connected system into the real-time digital simulator simulation model, a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, also known as a mirror virtual system of the energy storage valve grid-connected system, is obtained. Then, the real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system can be run to analyze the operating risks of the energy storage valve grid-connected system.

[0099] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application can analyze the operating risks of the energy storage valve grid-connected system based on a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system. When the operating mode of the power grid changes, the operating risks of the energy storage valve grid-connected system can be timely analyzed, judged and warned, thereby ensuring the safe and stable operation of the power grid.

[0100] In some embodiments, the above-mentioned step S60 may specifically include: based on a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, performing impedance scanning on the power grid and the energy storage system in the energy storage valve grid-connected system respectively, to obtain a first impedance characteristic curve corresponding to the power grid and / or a second impedance characteristic curve corresponding to the energy storage system, so as to analyze the operation risk of the energy storage valve grid-connected system.

[0101] After importing the system data and operating status of the energy storage valve grid-connected system into the real-time digital simulator simulation model, a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, also known as a mirror virtual system of the energy storage valve grid-connected system, can be obtained. Based on the real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, a frequency sweep method can be used to inject small disturbance signals into the power grid and energy storage system in the energy storage valve grid-connected system, respectively, to perform impedance scans on the power grid and the energy storage system, respectively, thereby identifying a first impedance characteristic curve corresponding to the power grid and a second impedance characteristic curve corresponding to the energy storage system.

[0102] Schematically, taking the impedance scan of the power grid as an example, small disturbance signals at different disturbance frequencies are injected into the power grid in sequence, and then the disturbance voltage and disturbance current caused by the small disturbance signal at each disturbance frequency are detected; the positive sequence component and negative sequence component of the disturbance voltage, as well as the positive sequence component and negative sequence component of the disturbance current are extracted using the symmetrical component method or other methods; the positive sequence component and negative sequence component of the disturbance voltage and the positive sequence component and negative sequence component of the disturbance current are Fourier transformed to transform each sequence component from the time domain to the frequency domain; the impedance value at the corresponding disturbance frequency is calculated according to each sequence component in the frequency domain, and thus the first impedance characteristic curve corresponding to the power grid is obtained according to the impedance values ​​at all disturbance frequencies. Wherein, the first impedance characteristic curve corresponding to the power grid includes the impedance amplitude curve corresponding to the power grid (including the positive sequence impedance amplitude curve and the negative sequence impedance amplitude curve) and the impedance phase curve corresponding to the power grid (including the positive sequence impedance phase curve and the negative sequence impedance phase curve).

[0103] Correspondingly, the second impedance characteristic curve corresponding to the energy storage system can also be obtained according to the above method. The second impedance characteristic curve corresponding to the energy storage system includes an impedance amplitude curve corresponding to the energy storage system (including a positive-sequence impedance amplitude curve and a negative-sequence impedance amplitude curve) and an impedance phase curve corresponding to the energy storage system (including a positive-sequence impedance phase curve and a negative-sequence impedance phase curve).

[0104] For example, impedance scanning is performed on the power grid and the energy storage system in the energy storage valve grid-connected system respectively, and the impedance characteristic curves obtained can be shown as (a) and (b) in Figure 6. Among them, (a) in Figure 6 shows that after the power grid and the energy storage system in the energy storage valve grid-connected system are impedance scanned respectively, the positive-sequence impedance amplitude curve corresponding to the power grid, the negative-sequence impedance amplitude curve corresponding to the power grid, the positive-sequence impedance amplitude curve corresponding to the energy storage system, and the negative-sequence impedance amplitude curve corresponding to the energy storage system are obtained, and the horizontal axis represents the frequency and the vertical axis represents the impedance amplitude. (b) in Figure 6 shows that after the power grid and the energy storage system in the energy storage valve grid-connected system are impedance scanned respectively, the positive-sequence impedance phase curve corresponding to the power grid, the negative-sequence impedance phase curve corresponding to the power grid, the positive-sequence impedance phase curve corresponding to the energy storage system, and the negative-sequence impedance phase curve corresponding to the energy storage system are obtained, and the horizontal axis represents the frequency and the vertical axis represents the impedance phase.

[0105] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application can perform impedance scanning on the power grid and energy storage system in the energy storage valve grid-connected system based on a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system. When the operating mode of the power grid changes, it is convenient to timely analyze, judge and issue early warnings on the operating risks of the energy storage valve grid-connected system based on the first impedance characteristic curve corresponding to the power grid and / or the second impedance characteristic curve corresponding to the energy storage system, thereby ensuring the safe and stable operation of the power grid.

[0106] In some embodiments, in the above-mentioned real-time digital simulator simulation model based on the digital twin of the energy storage valve grid-connected system, impedance scanning is performed on the power grid and the energy storage system in the energy storage valve grid-connected system respectively to obtain a first impedance characteristic curve corresponding to the power grid and / or a second impedance characteristic curve corresponding to the energy storage system to analyze the operation risk of the energy storage valve grid-connected system. It can also include: determining whether there is an oscillation risk in the energy storage valve grid-connected system based on the first impedance characteristic curve and the second impedance characteristic curve; if there is an oscillation risk, determining that a virtual impedance module needs to be added to the current inner loop controller corresponding to the energy storage valve grid-connected system.

[0107] After performing impedance scans on the grid and energy storage system in the energy storage valve grid-connected system, obtaining a first impedance characteristic curve corresponding to the grid and a second impedance characteristic curve corresponding to the energy storage system, a Nyquist curve of Zg / Zin, as shown in Figure 6(c), can be generated based on the first and second impedance characteristic curves, where Zg represents the impedance of the grid and Zin represents the impedance of the energy storage system. The intersection of the Zg / Zin Nyquist curve with the unit circle can be used to determine whether the energy storage valve grid-connected system is at risk of oscillation.

[0108] Schematically, as shown in (a) in Figure 6, the impedance amplitude curve corresponding to the power grid can be generated based on the positive-sequence impedance amplitude curve corresponding to the power grid and the negative-sequence impedance amplitude curve corresponding to the power grid; as shown in (b) in Figure 6, the impedance phase curve corresponding to the power grid can be generated based on the positive-sequence impedance phase curve corresponding to the power grid and the negative-sequence impedance phase curve corresponding to the power grid.

[0109] Based on the impedance amplitude curve corresponding to the grid, the positive-sequence impedance amplitude curve corresponding to the energy storage system, the negative-sequence impedance amplitude curve corresponding to the energy storage system, the impedance phase curve corresponding to the grid, the positive-sequence impedance phase curve corresponding to the energy storage system, and the negative-sequence impedance phase curve corresponding to the energy storage system, the Nyquist curve of Zg / Zin as shown in (c) of Figure 6 is drawn.

[0110] As shown in (c) of Figure 6, it includes the Nyquist curve between the impedance of the grid and the positive-sequence impedance (i.e., Zp) of the energy storage system (hereinafter referred to as the Nyquist curve corresponding to the positive-sequence impedance), and the Nyquist curve between the impedance of the grid and the negative-sequence impedance (i.e., Zn) of the energy storage system (hereinafter referred to as the Nyquist curve corresponding to the negative-sequence impedance).

[0111] For example, based on the intersection of the Nyquist curve corresponding to the positive-sequence impedance and the unit circle, the amplitude margin corresponding to the positive-sequence impedance at 420Hz is determined to be 2.7dB, and the phase margin corresponding to the positive-sequence impedance at 440Hz is determined to be 10°. Correspondingly, based on the intersection of the Nyquist curve corresponding to the negative-sequence impedance and the unit circle, the amplitude margin corresponding to the negative-sequence impedance at 350Hz is determined to be 7.5dB, and the phase margin corresponding to the negative-sequence impedance at 440Hz is determined to be 23°. Therefore, it can be seen that the phase margin corresponding to the positive-sequence impedance at 440Hz is insufficient, thereby determining that the energy storage valve grid-connected system has an oscillation risk at 440Hz.

[0112] It should be noted that the black dot shown in (c) of FIG6 represents the intersection of the Nyquist curve corresponding to the positive-sequence impedance and the unit circle, and the black dots interconnected by solid lines between (c) of FIG6, (b) of FIG6, and (a) of FIG6 all represent the same point, but in different forms of expression.

[0113] If an energy storage valve grid-connected system is identified as oscillating, a virtual impedance module can be added to the corresponding current inner loop controller. This module changes the impedance of the energy storage system, increasing its damping and improving its stability margin, thereby reducing the risk of oscillation.

[0114] FIG7 is a control block diagram of a current inner loop controller according to some embodiments of the present application. abc The abc / dq coordinates are changed by the phase angle ωt to obtain the d-axis current component i under the dq coordinates d and the q-axis current component i in dq coordinates q The d-axis current reference value i d * and the d-axis current component i d The difference between the two values ​​is passed through the proportional integral (PI) controller to obtain the first parameter, which is the q-axis current component i q The voltage after ωL decoupling and the d-axis voltage component U d After summing, the first parameter is subtracted and the d-axis modulation voltage V is output by the current inner loop controller. d . Set the q-axis current reference value i q * and the q-axis current component i q The difference between the two is passed through the PI controller to obtain the second parameter, which is the q-axis voltage component U q and the d-axis current component i d The difference of the voltage after ωL decoupling is subtracted from the second parameter and used as the q-axis modulation voltage V output by the current inner loop controller. q The d-axis modulation voltage V output by the current inner loop controller is dand q-axis modulation voltage V q After the phase angle ωt is transformed into dq / abc coordinates, it is then combined with the three-phase alternating current i abc The voltage difference after passing through the virtual impedance module is used to obtain the three-phase voltage V abc The three-phase voltage can be used as a modulation wave of the modular multi-level converter. The modulation wave then generates a driving signal after passing through a pulse width modulation (PWM) module to control the on and off of the first switch tube Q1 and the second switch tube Q2 in the modular multi-level converter.

[0115] It should be noted that the current inner loop controller is the software control module of the energy storage valve grid-connected system. In the case that the energy storage valve grid-connected system has an oscillation risk, a virtual impedance module can be added to the current inner loop controller to reduce the oscillation risk; and in the case that the energy storage valve grid-connected system does not have an oscillation risk, there is no need to add a virtual impedance module to the current inner loop controller, that is, the virtual impedance module in the current inner loop controller shown in Figure 7 can be removed, so that the d-axis modulation voltage V output by the current inner loop controller is d and q-axis modulation voltage V q After the phase angle ωt is transformed into dq / abc coordinates, the three-phase voltage V can be obtained. abc .

[0116] The virtual impedance module includes a filter and a virtual impedance, and the filter allows frequencies to pass through at frequencies where there is an oscillation risk.

[0117] As shown in FIG7 , the virtual impedance module added to the current inner loop controller may include a filter and a virtual impedance R v The input end of the filter is used to receive three-phase AC power i abc , the output of the filter is connected to the virtual impedance R v The input terminal connection of

[0118] The frequency that the filter allows to pass is the frequency where there is an oscillation risk. For example, if the energy storage valve grid-connected system has an oscillation risk at 440Hz, the frequency that the filter allows to pass is 440Hz. v The specific value of can be determined based on experience.

[0119] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application can determine whether there is an oscillation risk in the energy storage valve grid-connected system based on the first impedance characteristic curve and the second impedance characteristic curve after the impedance scan. If there is an oscillation risk, a virtual impedance module is added to the current inner loop controller to increase the damping of the energy storage system, thereby improving the stability margin and reducing the oscillation risk.

[0120] In some embodiments, after performing impedance scanning on the power grid and the energy storage system in the energy storage valve grid-connected system based on the above-mentioned real-time digital simulator simulation model of the digital twin of the energy storage valve grid-connected system, and obtaining a first impedance characteristic curve corresponding to the power grid and / or a second impedance characteristic curve corresponding to the energy storage system to analyze the operation risk of the energy storage valve grid-connected system, the method may further include: determining the parameter value of the control parameter to be adjusted in the virtual synchronous machine corresponding to the energy storage valve grid-connected system according to the first impedance characteristic curve; the control parameter to be adjusted includes the damping coefficient and / or the inertia constant.

[0121] Schematically, FIG8 is a control block diagram of a virtual synchronous generator (VSG) according to some embodiments of the present application. Referring to FIG8 , ΔP* M Indicates the active power reference value of the virtual synchronous machine, ΔP* e represents the active power measurement value of the virtual synchronous machine, D represents the damping coefficient of the virtual synchronous machine, H S Indicates the inertia constant of the virtual synchronous machine, S E represents the synchronous power coefficient of the virtual synchronous machine, Δω* represents the per-unit value of the angular frequency deviation, ω n represents the rated value of the angular frequency, Δω represents the actual value of the angular frequency deviation, s represents the Laplace operator, and Δδ represents the phase angle of the output voltage of the virtual synchronous machine.

[0122] Therefore, after performing impedance scanning on the grid in the energy storage valve grid-connected system and obtaining the first impedance characteristic curve corresponding to the grid, the damping coefficient D and / or inertia constant H in the virtual synchronous machine corresponding to the energy storage valve grid-connected system can be determined according to the first impedance characteristic curve. S Parameter value.

[0123] It should be noted that the virtual synchronous machine is a software control module of the energy storage valve grid-connected system, and the control parameters to be adjusted in the virtual synchronous machine can be understood as the control parameters of the energy storage system.

[0124] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application can make the energy storage system have better dynamic response characteristics by online adjusting the parameter values ​​of the control parameters to be adjusted in the virtual synchronous machine corresponding to the energy storage valve grid-connected system.

[0125] In some embodiments, the step of determining, based on the first impedance characteristic curve, the parameter value of the control parameter to be adjusted in the virtual synchronous machine corresponding to the energy storage valve grid-connected system may specifically include: determining the synchronous power coefficient of the virtual synchronous machine based on the first impedance characteristic curve; determining the optimal damping ratio based on the root locus corresponding to the synchronous power coefficient; and determining, based on the damping ratio, the parameter value of the control parameter to be adjusted in the virtual synchronous machine.

[0126] For the virtual synchronous machine shown in Figure 8, different synchronous power coefficients S can be plotted. E The corresponding root loci are obtained, and a schematic diagram of the root loci corresponding to the virtual synchronous machine is obtained as shown in FIG9 .

[0127] Typically, the control parameters of an energy storage system are designed according to a certain grid strength. During actual operation, the grid strength will change with the actual operating mode, which may cause the dynamic response characteristics of the energy storage system to deteriorate.

[0128] Therefore, the synchronous power coefficient S related to the grid strength can be calculated based on the first impedance characteristic curve corresponding to the grid. E Then, from the root locus corresponding to the virtual synchronous machine shown in Figure 9, find the synchronous power coefficient S of the virtual synchronous machine calculated above E The corresponding root locus is obtained to find the optimal damping ratio ξ, which is a damping parameter reflecting the dynamic response characteristics; then, the parameter values ​​of the damping coefficient and / or inertia constant in the virtual synchronous machine are determined according to the optimal damping ratio ξ.

[0129] For example, the following formula can be used to determine the parameter values ​​of the damping coefficient and / or inertia constant in the virtual synchronous machine: 2×ω s ×ξ=D / H s

[0130] Among them, ω s represents the natural frequency of the system.

[0131] The digital twin construction method for the energy storage valve grid-connected system proposed in the embodiments of this application can calculate the synchronous power coefficient related to the grid strength based on the first impedance characteristic curve corresponding to the grid, and then find the optimal damping ratio to determine the parameter values ​​of the damping coefficient and / or inertia constant in the virtual synchronous machine. In this way, the control parameters of the energy storage system can be adjusted online according to the actual operating grid strength, which can improve the dynamic response characteristics of the energy storage system.

[0132] In some embodiments, the step of determining the synchronous power coefficient of the virtual synchronous machine based on the first impedance characteristic curve may specifically include: determining the fundamental frequency impedance of the power grid at the fundamental frequency based on the first impedance characteristic curve; determining the short-circuit ratio of the power grid based on the fundamental frequency impedance; determining the equivalent total impedance between the virtual synchronous machine and the power grid based on the short-circuit ratio; and determining the synchronous power coefficient of the virtual synchronous machine based on the equivalent total impedance.

[0133] First, the fundamental frequency impedance of the grid at a fundamental frequency (e.g., 50 Hz) can be found based on a first impedance characteristic curve corresponding to the grid. Then, the short circuit ratio (SCR) of the grid can be derived based on the fundamental frequency impedance of the grid at the fundamental frequency.

[0134] The short-circuit ratio (SCR) represents the system's short-circuit capacity divided by the device's capacity. Therefore, a high SCR indicates that the device is connected to a strong system, indicating that switching it on and off will have a minimal impact on the system. The short-circuit capacity, at unit voltage, is numerically equal to the system's admittance, which is the inverse of the system's Thevenin equivalent impedance. A larger short-circuit capacity reduces the system's Thevenin equivalent resistance, and switching loads, shunt capacitors, or reactors will not cause significant voltage fluctuations, resulting in a stronger system.

[0135] Next, the equivalent total impedance Z between the virtual synchronous machine and the grid is calculated based on the short-circuit ratio of the grid. There is a one-to-one correspondence between the short-circuit ratio of the grid and the equivalent total impedance Z.

[0136] Therefore, the short-circuit ratio SCR of the power grid is only related to the equivalent total impedance Z.

[0137] Then, the synchronous power coefficient of the virtual synchronous machine is determined based on the equivalent total impedance between the virtual synchronous machine and the power grid. For example, the equivalent total impedance Z and the synchronous power coefficient S E The following formula is satisfied:

[0138] Where U represents the terminal voltage of the virtual synchronous machine, U g Therefore, if the equivalent total impedance Z between the virtual synchronous machine and the grid changes, the synchronous power coefficient S of the virtual synchronous machine is determined accordingly. E It also changes, thereby changing the control effect of the energy storage system.

[0139] The digital twin construction method of the energy storage valve grid-connected system proposed in the embodiment of the present application, since different short-circuit ratios indicate different grid strengths, can calculate the equivalent total impedance based on the short-circuit ratio of the grid, and then calculate the synchronous power coefficient related to the grid strength, so as to improve the adjustment accuracy when the control parameters of the energy storage system are adjusted online, thereby optimizing the dynamic response process of the energy storage system online.

[0140] Based on the same inventive concept, the embodiment of the present application also provides a digital twin construction device for implementing the energy storage valve grid-connected system involved above. The implementation solution provided by the digital twin construction device for the energy storage valve grid-connected system is similar to the implementation solution described in the above method. Therefore, the specific definition of the digital twin construction device for one or more energy storage valve grid-connected systems provided below can be found in the definition of the digital twin construction method for the energy storage valve grid-connected system above, and will not be repeated here.

[0141] FIG10 is a schematic diagram of the structure of a digital twin construction device for an energy storage valve grid-connected system according to some embodiments of the present application. Specifically, the digital twin construction device 1000 for the energy storage valve grid-connected system includes: a first acquisition module 1001, a second acquisition module 1002, a relationship establishment module 1003, a system data import module 1004, and an operating status transmission module 1005. The first acquisition module 1001 is used to acquire system data and operating status of the energy storage valve grid-connected system, where the system data includes data information of each component in the energy storage valve grid-connected system; the second acquisition module 1002 is used to acquire a data file of a real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system; the relationship establishment module 1003 is used to establish a relationship data table between the system data and each component in the data file; the system data import module 1004 is used to update the data file according to the relationship data table to import the system data into the real-time digital simulator simulation model; and the operating status transmission module 1005 is used to transmit the operating status to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

[0142] In some embodiments, the relationship establishment module 1003 is specifically used to establish an index corresponding to the system data; based on the index, establish a relationship data table between the system data and each element in the data file.

[0143] In some embodiments, the digital twin construction apparatus 1000 for the energy storage valve grid-connected system further includes: a first update module and a second update module. The first update module is configured to update a relational data table based on the changed system data when system data changes; the second update module is configured to update a data file based on the updated relational data table to import the changed system data into the simulation model of the real-time digital simulator.

[0144] In some embodiments, a storage valve grid-connected system includes a power grid and an energy storage system, wherein the energy storage system includes a converter and a storage valve. System data includes power grid data, converter data, and storage valve data. The power grid data includes data information of each component in the power grid, the converter data includes data information of each component in the converter, and the storage valve data includes data information of each component in the storage valve.

[0145] In some embodiments, the operating status includes an opening and closing status, an operating mode, and a power command.

[0146] In some embodiments, the digital twin construction device 1000 of the energy storage valve grid-connected system also includes an operation risk analysis module, which is used to run a real-time digital simulator simulation model with the digital twin of the energy storage valve grid-connected system to analyze the operation risk of the energy storage valve grid-connected system.

[0147] In some embodiments, the operation risk analysis module is specifically used to perform impedance scanning on the power grid and energy storage system in the energy storage valve grid-connected system based on a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, to obtain a first impedance characteristic curve corresponding to the power grid and / or a second impedance characteristic curve corresponding to the energy storage system, so as to analyze the operation risk of the energy storage valve grid-connected system.

[0148] Figure 11 is a schematic diagram of the structure of an electronic device according to some embodiments of the present application. Specifically, the electronic device 1100 may include: a processor 1101, a memory 1102, a bus 1103, and a communication interface 1104. The processor 1101, the communication interface 1104, and the memory 1102 are connected via the bus 1103. The memory 1102 stores a computer program executable on the processor 1101. When the processor 1101 executes the computer program, it executes the digital twin construction method for the energy storage valve grid-connected system provided in any of the above-mentioned embodiments of the present application.

[0149] The implementation principle and technical effects of the electronic device provided in the embodiment of the present application are similar to those of the above-mentioned method embodiment and will not be repeated here.

[0150] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program or instruction. When the computer program or instruction is executed, the digital twin construction method of the energy storage valve grid-connected system provided by any of the above embodiments is executed.

[0151] The storage medium may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0152] The computer-readable storage medium provided in the embodiment of the present application has similar implementation principles and technical effects to those of the above-mentioned method embodiment, and will not be described in detail here.

[0153] This application also provides a computer program product that, when executed on a computer, causes the computer to execute the method for constructing a digital twin of an energy storage valve grid-connected system provided in any of the aforementioned embodiments. The implementation principles and technical effects are similar to those of the aforementioned method embodiments and will not be further elaborated here.

[0154] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A digital twin construction method for a storage valve grid-connected system, wherein: include: Obtain system data and operating status of the energy storage valve grid-connected system; The system data includes data information of each component in the energy storage valve grid-connected system; Obtain a data file of a real-time digital simulator simulation model corresponding to the energy storage valve grid-connected system; Establishing a relational data table between the system data and each element in the data file; updating the data file according to the relational data table to import the system data into the simulation model of the real-time digital simulator; The operating status is sent to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

2. The method according to claim 1, wherein: The step of establishing a relational data table between the system data and each element in the data file comprises: Establishing an index corresponding to the system data; Based on the index, a relational data table between the system data and each element in the data file is established.

3. The method according to claim 1, wherein: After updating the data file according to the relational data table to import the system data into the simulation model of the real-time digital simulator, the method further includes: When the system data changes, updating the relational data table according to the changed system data; The data file is updated according to the updated relational data table to import the changed system data into the simulation model of the real-time digital simulator.

4. The method according to claim 1, wherein: The energy storage valve grid-connected system includes a power grid and an energy storage system, and the energy storage system includes a converter and an energy storage valve; the system data includes power grid data, converter data and energy storage valve data; The grid data includes data information of each component in the grid, the converter data includes data information of each component in the converter, and the energy storage valve data includes data information of each component in the energy storage valve.

5. The method according to claim 1, wherein: The operating status includes opening and closing status, operating mode and power instruction.

6. The method according to any one of claims 1 to 5, wherein: After sending the operating state to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system, the method further includes: Run the real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system to analyze the operating risks of the energy storage valve grid-connected system.

7. The method according to claim 6, wherein: The running of the real-time digital simulator simulation model of the digital twin of the energy storage valve grid-connected system to analyze the operation risk of the energy storage valve grid-connected system includes: Based on the running real-time digital simulator simulation model of the digital twin of the energy storage valve grid-connected system, impedance scanning is performed on the power grid and the energy storage system in the energy storage valve grid-connected system respectively to obtain a first impedance characteristic curve corresponding to the power grid and / or a second impedance characteristic curve corresponding to the energy storage system, so as to analyze the operation risk of the energy storage valve grid-connected system.

8. A digital twin construction device for a storage valve grid-connected system, wherein: include: The first acquisition module is used to acquire system data and operating status of the energy storage valve grid-connected system; The system data includes data information of each component in the energy storage valve grid-connected system; A second acquisition module is used to acquire a data file of a simulation model of a real-time digital simulator corresponding to the energy storage valve grid-connected system; A relationship building module, used for building a relationship data table between the system data and each element in the data file; A system data import module, used for updating the data file according to the relational data table, so as to import the system data into the simulation model of the real-time digital simulator; An operating status sending module is used to send the operating status to the real-time digital simulator simulation model to obtain a real-time digital simulator simulation model that is a digital twin of the energy storage valve grid-connected system.

9. An electronic device, wherein: It comprises a memory and a processor, the memory is used to store a computer program, and the processor is used to call the computer program to execute the digital twin construction method of the energy storage valve grid-connected system as described in any one of claims 1 to 7.

10. A computer-readable storage medium, wherein: The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction is executed, the digital twin construction method of the energy storage valve grid-connected system according to any one of claims 1 to 7 is implemented.

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