Node elimination based fan equivalent modeling method, modeling device and storage medium
By constructing an equivalent electrical topology using the node elimination method, the problem of high computational complexity in existing technologies is solved, enabling efficient equivalent modeling of wind turbine systems and improving computational speed and efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
- Filing Date
- 2022-07-29
- Publication Date
- 2026-06-16
AI Technical Summary
Existing real-time simulation platforms and models are insufficient to meet the simulation requirements of large-scale wind power integration into the power system, as they suffer from high computational complexity, slow computation speed, and reduced modeling efficiency.
The equivalent electrical topology of the wind turbine system is constructed by using the node elimination method, which reduces the number of electrical nodes. Electrical quantity information is calculated through the equivalent electrical nodes to achieve equivalent modeling.
It reduces the computational complexity of electrical topology, increases the computational speed of electrical quantity information, shortens the computation time of equivalent modeling, and improves modeling speed and efficiency.
Smart Images
Figure CN115169153B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of equivalent modeling technology for wind turbine units, and in particular to a wind turbine equivalent modeling method, modeling device and storage medium based on node elimination. Background Technology
[0002] In recent years, the large-scale, multi-voltage-level integration of key components such as offshore wind power will lead to a sharp increase in the size and complexity of the power system. The high switching frequency and large computational load of large-scale, high-proportion power electronic equipment pose a huge challenge to real-time simulation. Existing common real-time simulation platforms and models are difficult to meet the simulation requirements of new power systems with large-scale wind power integration in the future.
[0003] As the scale and complexity of power systems increase dramatically, the computational complexity of current real-time simulation platforms and model-related equivalent modeling methods is high, which slows down the computation speed and leads to a gradual deterioration in the effectiveness of the current equivalent modeling methods. Summary of the Invention
[0004] Based on this, it is necessary to address the above-mentioned problems. This application proposes a wind turbine equivalent modeling method, modeling device, and storage medium based on node elimination, which can reduce the computational complexity of the electrical topology in the power system, improve the computational speed of electrical quantity information of electrical nodes, thereby shortening the computation time of equivalent modeling of the entire wind turbine system and improving modeling speed and efficiency.
[0005] Firstly, this application provides a method for equivalent modeling of wind turbines based on node elimination, including:
[0006] Construct the full network electrical topology of the wind turbine system, which includes all electrical nodes in the wind turbine system.
[0007] The electrical topology of the entire network is eliminated by the node elimination method to obtain the equivalent electrical topology of the wind turbine system. The number of electrical nodes in the equivalent electrical topology is less than the number of electrical nodes in the wind turbine system.
[0008] The electrical quantity information corresponding to the equivalent electrical node is calculated based on the equivalent electrical topology.
[0009] Based on the electrical quantity information corresponding to the equivalent electrical nodes, the electrical quantity information of all electrical nodes in the entire network electrical topology is obtained, and the equivalent model of the wind turbine system is completed.
[0010] Optionally, in one possible implementation of the first aspect, the electrical quantity information corresponding to the equivalent electrical node is calculated based on the equivalent electrical topology, including:
[0011] Calculate the admittance matrix and current column vector corresponding to the equivalent electrical node based on the equivalent electrical topology. The current column vector includes all currents injected into the equivalent electrical node, and the admittance matrix is composed of the admittances between adjacent nodes in the equivalent electrical node.
[0012] By connecting the admittance matrix and current column vector corresponding to the equivalent electrical node with other electrical networks in the equivalent electrical topology, the electromagnetic transient network equations are solved to obtain the node voltage corresponding to the equivalent electrical node.
[0013] Optionally, in one possible implementation of the first aspect, electrical quantity information corresponding to all electrical nodes in the entire network electrical topology is obtained based on the electrical quantity information corresponding to the equivalent electrical nodes, including:
[0014] Based on the electrical topology of the entire network, the node voltage and branch current of all electrical nodes in the electrical topology of the entire network are calculated according to the node voltage of the equivalent electrical node.
[0015] Optionally, in one possible implementation of the first aspect, the wind turbine system includes a wind turbine, a first AC filter, a second AC filter, a rectifier-inverter, a first inductor, a second inductor, and a step-up transformer.
[0016] Optionally, in one possible implementation of the first aspect, the equivalent electrical topology includes three equivalent electrical nodes, denoted as a, b, and c, which correspond to the three-phase windings in the step-up transformer, respectively.
[0017] Optionally, in one possible implementation of the first aspect, the admittance matrix G corresponding to the three equivalent electrical nodes is:
[0018]
[0019] Where Gaa is the input conductance of node a; Gab is the transfer conductance from node a to node b; Gac is the transfer conductance from node a to node c; Gba is the transfer conductance from node b to node a; Gbb is the input conductance of node b; Gbc is the transfer conductance from node b to node c; Gca is the transfer conductance from node c to node a; Gcb is the transfer conductance from node c to node b; and Gcc is the input conductance of node c.
[0020] Optionally, in one possible implementation of the first aspect, the current column vector I corresponding to the three equivalent electrical nodes is:
[0021]
[0022] Where Ia, Ib, and Ic are the injected currents at nodes a, b, and c, respectively.
[0023] Secondly, this application provides a modeling apparatus, comprising:
[0024] The module consists of a construction module, a node elimination module, a calculation module, and an acquisition module.
[0025] The building module is used to: build the full network electrical topology of the wind turbine system, which includes all electrical nodes in the wind turbine system;
[0026] The node elimination module is used to: eliminate nodes in the electrical topology of the entire network based on the node elimination method to obtain the equivalent electrical topology of the wind turbine system, wherein the number of electrical nodes in the equivalent electrical topology is less than the number of electrical nodes in the wind turbine system.
[0027] The calculation module is used to: calculate the electrical quantity information corresponding to the equivalent electrical nodes based on the equivalent electrical topology;
[0028] The acquisition module is used to: obtain the electrical quantity information of all electrical nodes in the entire network electrical topology based on the electrical quantity information corresponding to the equivalent electrical nodes, and complete the equivalent modeling of the wind turbine system.
[0029] Thirdly, this application also provides a modeling apparatus, comprising:
[0030] A processor and a memory, wherein the memory stores executable code;
[0031] When the executable code is executed by the processor, it causes the processor to perform the methods described in the first aspect above and any of its implementations.
[0032] Fourthly, this application provides a computer-readable storage medium having executable code stored thereon, which, when invoked by a modeling device, causes the modeling device to perform the method described in the first aspect above and any of its implementations.
[0033] The technical solution provided in this application has the following beneficial effects:
[0034] In the technical solution of this application, the equivalent modeling of the wind turbine system is based on the node elimination method. On the one hand, the node elimination method can ensure that the calculation accuracy of the equivalent electrical topology remains unchanged from the calculation accuracy of the entire network electrical topology before and after equivalence. On the other hand, the equivalent electrical topology after equivalence can reduce the number of electrical nodes, reduce the calculation complexity of the electrical topology, and improve the calculation speed of the electrical quantity information of the electrical nodes, thereby shortening the calculation time of the equivalent modeling of the entire wind turbine system and improving the modeling speed and efficiency.
[0035] It should be understood that the information before and after equivalence in the equivalent modeling method of this application is reversible. The voltage and current information of the detailed circuit between equivalents can be obtained through the voltage and current information in the equivalent electrical topology after equivalence.
[0036] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0037] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.
[0038] Figure 1 This is a flowchart illustrating the wind turbine equivalent modeling method based on node elimination in this application embodiment;
[0039] Figure 2 This is a structural schematic diagram of a wind turbine system in an embodiment of this application;
[0040] Figure 3 This is a schematic diagram of the equivalent electrical topology of the wind turbine system in the embodiments of this application;
[0041] Figure 4 This is a schematic diagram of the modeling device in an embodiment of this application;
[0042] Figure 5 This is another structural schematic diagram of the modeling device in the embodiments of this application. Detailed Implementation
[0043] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.
[0044] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.
[0045] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.
[0046] The technical solution in this application embodiment is applicable to real-time simulation platforms and modeling in the field of power systems. It provides simulation and modeling solutions for power systems with rapidly increasing scale and complexity. It can reduce the computational complexity of electrical topology in power systems, improve the computational speed of electrical quantity information of electrical nodes, thereby shortening the computation time of equivalent modeling of the entire wind turbine system and improving modeling speed and efficiency.
[0047] To facilitate understanding of the technical solutions in this application, the embodiments of this application will be described below with reference to specific accompanying drawings, as follows:
[0048] Figure 1 This is a flowchart illustrating a wind turbine equivalent modeling method based on node elimination in an embodiment of this application.
[0049] like Figure 1 As shown, the wind turbine equivalent modeling method based on node elimination in this embodiment of the application includes:
[0050] 101. Construct the full network electrical topology of the wind turbine system.
[0051] In this embodiment, the full network electrical topology includes all electrical nodes in the wind turbine system. For details on how to construct the full network electrical topology of the wind turbine system, please refer to other relevant materials; further details will not be provided here.
[0052] 102. Based on the node elimination method, the electrical topology of the entire network is eliminated to obtain the equivalent electrical topology of the wind turbine system.
[0053] In this embodiment, the full network electrical topology includes all electrical nodes in the entire wind turbine system. A node elimination method is used to remove some nodes to obtain the equivalent electrical topology of the wind turbine system. In this equivalent electrical topology, the number of electrical nodes is less than the number of electrical nodes in the wind turbine system. It should be understood that converting the full network electrical topology to an equivalent electrical topology is essentially an equivalent transformation or equivalence process. The electrical characteristics exhibited by the electrical topology before and after equivalence are the same. The difference lies in the fact that using the equivalent electrical topology allows for better equivalence modeling of the wind turbine system.
[0054] 103. Calculate the electrical quantity information corresponding to the equivalent electrical node based on the equivalent electrical topology.
[0055] In this embodiment of the application, the number of equivalent electrical nodes is two or more, and the electrical quantity information corresponding to the equivalent electrical nodes includes the injection current, node voltage, and conductance in the admittance matrix.
[0056] Optionally, in one embodiment of this application, calculating the electrical quantity information corresponding to the equivalent electrical node based on the equivalent electrical topology includes:
[0057] Calculate the admittance matrix and current column vector corresponding to the equivalent electrical node based on the equivalent electrical topology. The current column vector includes all currents injected into the equivalent electrical node, and the admittance matrix is composed of the admittances between adjacent nodes in the equivalent electrical node.
[0058] By connecting the admittance matrix and current column vector corresponding to the equivalent electrical node with other electrical networks in the equivalent electrical topology, the electromagnetic transient network equations are solved to obtain the node voltage corresponding to the equivalent electrical node.
[0059] 104. Based on the electrical quantity information corresponding to the equivalent electrical nodes, obtain the electrical quantity information of all electrical nodes in the entire network electrical topology and complete the equivalent modeling of the wind turbine system.
[0060] Unlike other equivalent modeling methods, the node elimination-based equivalent modeling method in this application has reversible information before and after equivalence. The voltage and current information of the detailed circuit between equivalents can be obtained through the voltage and current information in the equivalent electrical topology after equivalence.
[0061] Optionally, in one embodiment of this application, obtaining the electrical quantity information corresponding to all electrical nodes in the entire network electrical topology based on the electrical quantity information corresponding to the equivalent electrical nodes includes:
[0062] Based on the electrical topology of the entire network, the node voltage and branch current of all electrical nodes in the electrical topology are calculated according to the node voltage of the equivalent electrical node. The electrical quantity information includes node voltage and branch current.
[0063] In summary, the technical solution in this application embodiment performs equivalent modeling of the wind turbine system based on the node elimination method. On the one hand, the node elimination method can ensure that the calculation accuracy of the equivalent electrical topology remains unchanged from the calculation accuracy of the entire network electrical topology before and after equivalence. On the other hand, the equivalent electrical topology after equivalence can reduce the number of electrical nodes, reduce the computational complexity of the electrical topology, and improve the calculation speed of the electrical quantity information of the electrical nodes, thereby shortening the computation time of equivalent modeling of the entire wind turbine system and improving the modeling speed and efficiency.
[0064] Furthermore, the equivalent modeling method in this application provides reversible information before and after equivalence. Detailed circuit voltage and current information between equivalent circuits can be obtained from the voltage and current information in the equivalent electrical topology after equivalence. It should be understood that the information before equivalence is the electrical quantity information of all electrical nodes in the entire network electrical topology, while the information after equivalence is the electrical quantity information of the equivalent electrical nodes in the equivalent electrical topology.
[0065] Furthermore, the method for equivalent modeling of wind turbines based on node elimination in this application embodiment will be described below using a specific structure of a wind turbine system as an example:
[0066] Figure 2 This is a schematic diagram of a wind turbine system in an embodiment of this application.
[0067] like Figure 2 As shown, the wind turbine system in this embodiment includes: a wind turbine, a first AC filter, a second AC filter, a rectifier-inverter, a first inductor, a second inductor, and a step-up transformer, wherein the first AC filter and the second AC filter are respectively... Figure 2 The AC filters shown on the left and right sides have the first and second inductors as follows: Figure 2 The inductors are shown on the left and right sides. Furthermore, Figure 2 The diagram also shows the three-phase windings a, b, and c of the step-up transformer.
[0068] like Figure 2 As shown, the transformer, the first inductor, and the first AC filter are connected to the same node. The other end of the first AC filter is connected to the node. The other end of the first inductor is connected to one end of the rectifier-inverter. The other end of the rectifier-inverter is connected to one end of the second inductor. The other end of the second inductor is connected to the wind turbine and the second AC filter at the same node.
[0069] Figure 3 This is a schematic diagram of the equivalent electrical topology of the wind turbine system in the embodiments of this application.
[0070] like Figure 3 As shown, the wind turbine equivalent modeling method based on node elimination in this application is used to... Figure 2 The wind turbine system shown is obtained after equivalent modeling. Figure 3 The equivalent electrical topology is shown.
[0071] exist Figure 3 The equivalent electrical topology includes three equivalent electrical nodes, denoted as a, b, and c, which correspond to the three-phase windings a, b, and c in the step-up transformer, respectively.
[0072] The node voltages of the three equivalent electrical nodes a, b and c are Ua, Ub and Uc3 respectively. The wind turbine system provides a 3x3 admittance matrix composed of three resistors Rab, Rbc and Rac. The injected currents of the three equivalent electrical nodes a, b and c are Ia, Ib and Ic respectively.
[0073] Optionally, in one embodiment of this application, the admittance matrix G corresponding to the three equivalent electrical nodes is:
[0074]
[0075] Where Gaa is the input conductance of node a; Gab is the transfer conductance from node a to node b; Gac is the transfer conductance from node a to node c; Gba is the transfer conductance from node b to node a; Gbb is the input conductance of node b; Gbc is the transfer conductance from node b to node c; Gca is the transfer conductance from node c to node a; Gcb is the transfer conductance from node c to node b; and Gcc is the input conductance of node c.
[0076] Optionally, in one embodiment of this application, the current column vector I corresponding to the three equivalent electrical nodes is:
[0077]
[0078] Where Ia, Ib, and Ic are the injected currents at nodes a, b, and c, respectively.
[0079] Corresponding to the aforementioned application function implementation method embodiments, this application also provides a modeling device and corresponding embodiments.
[0080] Figure 4 This is a schematic diagram of the modeling device in an embodiment of this application.
[0081] like Figure 4As shown, the modeling device 40 in this embodiment includes:
[0082] The module consists of a construction module 401, a node elimination module 402, a calculation module 403, and an acquisition module 404.
[0083] Module 401 is used to: construct the full network electrical topology of the wind turbine system, wherein the full network electrical topology includes all electrical nodes in the wind turbine system;
[0084] The node elimination module 402 is used to: perform node elimination on the electrical topology of the entire network based on the node elimination method to obtain the equivalent electrical topology of the wind turbine system, wherein the number of equivalent electrical nodes in the equivalent electrical topology is less than the number of electrical nodes in the wind turbine system.
[0085] The calculation module 403 is used to: calculate the electrical quantity information corresponding to the equivalent electrical node based on the equivalent electrical topology;
[0086] The acquisition module 404 is used to: acquire the electrical quantity information of all electrical nodes in the entire network electrical topology based on the electrical quantity information corresponding to the equivalent electrical nodes, and complete the equivalent modeling of the wind turbine system.
[0087] Optionally, in one embodiment of this application:
[0088] The calculation module 403 is specifically used to: calculate the admittance matrix and current column vector corresponding to the equivalent electrical node based on the equivalent electrical topology, wherein the current column vector includes all currents injected into the equivalent electrical node, and the admittance matrix is composed of the admittances between adjacent nodes in the equivalent electrical node; further, the calculation module 403 connects the admittance matrix and current column vector corresponding to the equivalent electrical node with other electrical networks in the equivalent electrical topology to solve the electromagnetic transient network equations to obtain the node voltage corresponding to the equivalent electrical node.
[0089] Optionally, in one embodiment of this application:
[0090] The acquisition module 404 is specifically used to: combine the entire network electrical topology and calculate the node voltage and branch current corresponding to all electrical nodes in the entire network electrical topology based on the node voltage corresponding to the equivalent electrical node.
[0091] Optionally, in one embodiment of this application:
[0092] The wind turbine system includes a wind turbine, a first AC filter, a second AC filter, a rectifier-inverter, a first inductor, a second inductor, and a step-up transformer. Optionally, one structure of the wind turbine system is as shown above. Figure 2 As shown in the image.
[0093] Optionally, in one embodiment of this application:
[0094] The equivalent electrical topology includes three equivalent electrical nodes, denoted as a, b, and c, which correspond to the three-phase windings in the step-up transformer.
[0095] Optionally, in one embodiment of this application:
[0096] The admittance matrix G corresponding to the three equivalent electrical nodes is:
[0097]
[0098] Where Gaa is the input conductance of node a; Gab is the transfer conductance from node a to node b; Gac is the transfer conductance from node a to node c; Gba is the transfer conductance from node b to node a; Gbb is the input conductance of node b; Gbc is the transfer conductance from node b to node c; Gca is the transfer conductance from node c to node a; Gcb is the transfer conductance from node c to node b; and Gcc is the input conductance of node c.
[0099] Optionally, in one embodiment of this application:
[0100] The current column vector I corresponding to the three equivalent electrical nodes is:
[0101]
[0102] Where Ia, Ib, and Ic are the injected currents at nodes a, b, and c, respectively.
[0103] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation and its beneficial effects have been described in detail in the embodiments related to the method, and will not be elaborated further here.
[0104] Figure 5 This is another structural schematic diagram of the modeling device in the embodiments of this application.
[0105] like Figure 5 As shown, the modeling apparatus 50 in this embodiment includes a memory 501 and a processor 502. The memory stores executable code, which, when executed by the processor, causes the processor to perform the method described in any of the above embodiments.
[0106] Processor 502 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.
[0107] Memory 501 may include various types of storage units, such as system memory, read-only memory (ROM), and permanent storage devices. ROM may store static data or instructions required by processor 502 or other modules of the computer. Permanent storage devices may be read-write storage devices. Permanent storage devices may be non-volatile storage devices that retain stored instructions and data even when the computer is powered off. In some embodiments, permanent storage devices use high-capacity storage devices (e.g., magnetic or optical disks, flash memory) as permanent storage devices. In other embodiments, permanent storage devices may be removable storage devices (e.g., floppy disks, optical drives). System memory may be a read-write storage device or a volatile read-write storage device, such as dynamic random access memory. System memory may store some or all of the instructions and data required by the processor during operation. Furthermore, memory 501 may include any combination of computer-readable storage media, including various types of semiconductor memory chips (DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), and disks and / or optical disks may also be used. In some implementations, memory 501 may include a removable storage device that is readable and / or writable, such as a laser disc (CD), a read-only digital versatile optical disc (e.g., DVD-ROM, dual-layer DVD-ROM), a read-only Blu-ray disc, an ultra-high density optical disc, a flash memory card (e.g., SD card, mini SD card, Micro-SD card, etc.), a magnetic floppy disk, etc. Computer-readable storage media do not contain carrier waves or transient electronic signals transmitted wirelessly or via wired connections.
[0108] The memory 501 stores executable code, which, when processed by the processor 502, can cause the processor 502 to execute part or all of the methods described above.
[0109] Furthermore, the method according to this application can also be implemented as a computer program or computer program product, which includes computer program code instructions for performing some or all of the steps in the method described above.
[0110] Alternatively, this application may be implemented as a computer-readable storage medium (or machine-readable storage medium) storing executable code (or computer program, or computer instruction code) thereon, which, when executed by a processor of a modeling device (or electronic device, server, etc.), causes the processor to perform part or all of the steps of the above-described method according to this application.
[0111] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.
[0112] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.
[0113] Finally, it should be noted that in this document, relationships such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "include," "contain," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.
[0114] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0115] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.
[0116] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.
[0117] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A wind turbine equivalent modeling method based on node elimination, characterized in that, include: Construct a complete network electrical topology for a wind turbine system, wherein the complete network electrical topology includes all electrical nodes in the wind turbine system; The entire network electrical topology is eliminated using a node elimination method to obtain the equivalent electrical topology of the wind turbine system. The number of equivalent electrical nodes in the equivalent electrical topology is less than the number of electrical nodes in the wind turbine system. The electrical quantity information corresponding to the equivalent electrical node is calculated based on the equivalent electrical topology. Based on the electrical quantity information corresponding to the equivalent electrical node, obtain the electrical quantity information of all electrical nodes in the entire network electrical topology, and complete the equivalent modeling of the wind turbine system; The information before and after the equivalent modeling is reversible, and the electrical quantity information of all electrical nodes in the entire network electrical topology can be obtained through the electrical quantity information corresponding to the equivalent electrical nodes. The electrical quantity information includes node voltage and branch current. The step of calculating the electrical quantity information corresponding to the equivalent electrical node based on the equivalent electrical topology includes: The admittance matrix and current column vector corresponding to the equivalent electrical node are calculated based on the equivalent electrical topology, wherein the current column vector includes all currents injected into the equivalent electrical node, and the admittance matrix is composed of the admittances between adjacent nodes in the equivalent electrical node; The admittance matrix and current column vector corresponding to the equivalent electrical node are connected to other electrical networks in the equivalent electrical topology to solve the electromagnetic transient network equations, thereby obtaining the node voltage corresponding to the equivalent electrical node.
2. The method according to claim 1, characterized in that, The step of obtaining electrical quantity information corresponding to all electrical nodes in the entire network electrical topology based on the electrical quantity information corresponding to the equivalent electrical node includes: Based on the complete network electrical topology, the node voltage and branch current of all electrical nodes in the complete network electrical topology are calculated according to the node voltage corresponding to the equivalent electrical node.
3. The method according to claim 1, characterized in that, The wind turbine system includes a wind turbine, a first AC filter, a second AC filter, a rectifier-inverter, a first inductor, a second inductor, and a step-up transformer.
4. The method according to claim 3, characterized in that, The equivalent electrical topology includes three equivalent electrical nodes, denoted as a, b, and c, which correspond to the three-phase windings in the step-up transformer.
5. The method according to claim 4, characterized in that, The admittance matrix G corresponding to the three equivalent electrical nodes is: in, Let be the input conductance of node a; Let be the transfer conductance from node a to node b. Let the transfer conductance be the conductance from node a to node c. The transfer conductance from node b to node a, Let be the input conductance of node b. The transfer conductance from node b to node c, Let the transfer conductance be the conductance from node c to node a. The transfer conductance from node c to node b, Let be the input conductance of node c.
6. The method according to claim 4, characterized in that, The current column vector I corresponding to the three equivalent electrical nodes is: Where Ia, Ib, and Ic are the injected currents at nodes a, b, and c, respectively.
7. A modeling apparatus, characterized in that, include: The module consists of a construction module, a node elimination module, a calculation module, and an acquisition module. The construction module is used to: construct the full network electrical topology of the wind turbine system, wherein the full network electrical topology includes all electrical nodes in the wind turbine system; The node elimination module is used to: perform node elimination on the entire network electrical topology based on the node elimination method to obtain the equivalent electrical topology of the wind turbine system, wherein the number of equivalent electrical nodes in the equivalent electrical topology is less than the number of electrical nodes in the wind turbine system. The calculation module is used to: calculate the electrical quantity information corresponding to the equivalent electrical node based on the equivalent electrical topology; The acquisition module is used to: acquire the electrical quantity information of all electrical nodes in the entire network electrical topology based on the electrical quantity information corresponding to the equivalent electrical node, and complete the equivalent modeling of the wind turbine system; The information before and after the equivalent modeling is reversible, and the electrical quantity information of all electrical nodes in the entire network electrical topology can be obtained through the electrical quantity information corresponding to the equivalent electrical nodes. The electrical quantity information includes node voltage and branch current. The step of calculating the electrical quantity information corresponding to the equivalent electrical node based on the equivalent electrical topology includes: The admittance matrix and current column vector corresponding to the equivalent electrical node are calculated based on the equivalent electrical topology, wherein the current column vector includes all currents injected into the equivalent electrical node, and the admittance matrix is composed of the admittances between adjacent nodes in the equivalent electrical node; The admittance matrix and current column vector corresponding to the equivalent electrical node are connected to other electrical networks in the equivalent electrical topology to solve the electromagnetic transient network equations, thereby obtaining the node voltage corresponding to the equivalent electrical node.
8. A modeling apparatus, characterized in that, include: A processor and a memory, wherein the memory stores executable code; When the executable code is executed by the processor, the processor performs the method as described in any one of claims 1-6.
9. A computer-readable storage medium having executable code stored thereon, which, when invoked by a processor in a modeling apparatus, causes the modeling apparatus to perform the method as described in any one of claims 1-6.