Electromagnetic transient fast simulation method and system for internal combustion engine and wind power bundling system

Abstract

The invention discloses an electromagnetic transient rapid simulation method and system for an internal combustion engine and a wind power bundling system, and the method comprises the steps: representing the characteristics of all equipment in the internal combustion engine and the wind power bundling system through a mathematical equation, carrying out the discretization of the mathematical equation, obtaining a discretized circuit equation, and obtaining a discretized circuit model of all equipment; on the basis of the actual circuit connection relation, the discretized circuit models are mutually connected to construct an overall circuit model of the internal combustion engine and the wind power bundling system; the overall circuit model is divided based on internal and external nodes, and information of the internal nodes of the system is transferred to external nodes, so that electromagnetic transient simulation is completed. According to the method, all the internal node information of the internal combustion engine and the wind power bundling system is transferred to the external nodes, the number of equivalent nodes during system simulation and the calculated amount during system calculation are reduced, and the electromagnetic transient simulation speed is increased. And since simplified equivalence does not exist in the node transfer process, internal node information is completely reserved, and the simulation precision is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic transient simulation, and in particular to a method and system for rapid electromagnetic transient simulation of an internal combustion engine and a wind power bundling system. Background Art

[0002] Accurate simulation of internal combustion engine and wind power bundling system helps to deeply understand the impact of wind power intermittency on the dynamic characteristics of internal combustion engine. At present, there are generally two ways to simulate the electromagnetic transient of internal combustion engine and wind power bundling system. One is to use the component model in the component library of electromagnetic transient simulation software for detailed modeling, which will result in extremely slow simulation speed; the second is to use the equivalent aggregation model to replace the internal combustion engine and wind power bundling system with the characteristics of a single or a small number of internal combustion engine and wind turbine models. However, the simulation accuracy of the equivalent aggregation algorithm is low, and the aggregation process needs to change in real time according to the operating characteristics, resulting in poor simulation speed-up effect. For the electromagnetic transient simulation of large internal combustion engine and wind power bundling system, if the matrix decoupling method and circuit superposition theorem can be used to reduce the number of system nodes and the amount of solution calculation, it will play an important role in improving the overall simulation efficiency of the system. However, since the internal combustion engine and wind power bundling system contains rotating equipment such as generators, converters, transformers and power electronic equipment, its modeling and simulation are very difficult. It is necessary to construct mathematical equations that accurately describe all equipment and construct their numerical integral discretization circuit models. Summary of the invention

[0003] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0004] In view of the above existing problems, the present invention is proposed.

[0005] Therefore, the present invention provides a method and system for rapid electromagnetic transient simulation of an internal combustion engine and a wind power bundling system to solve the problem of slow electromagnetic transient simulation speed of the existing internal combustion engine and wind power bundling system.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides an electromagnetic transient rapid simulation method for an internal combustion engine and a wind power bundling system, comprising: using a mathematical equation to characterize the characteristics of each device in the internal combustion engine and the wind power bundling system, and discretizing the mathematical equation to obtain a discretized circuit equation to obtain a discretized circuit model of each device;

[0008] Based on the actual circuit connection relationship, the discretized circuit models are connected to each other to construct an overall circuit model of the internal combustion engine and the wind power bundling system;

[0009] The overall circuit model is divided based on internal and external nodes, and the information of the internal nodes of the system is transferred to the external nodes to complete the electromagnetic transient simulation.

[0010] As a preferred solution of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system of the present invention, the mathematical equations used to characterize the characteristics of each device in the internal combustion engine and wind power bundling system include:

[0011] The target physical model is obtained to describe the dynamic behavior of each device, the key state variables of each device are determined, and the mathematical equations of the internal combustion engine and wind power bundling system equipment are established based on the target physical model and state variables.

[0012] As a preferred solution of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system of the present invention, wherein: the mathematical equation is discretized to obtain a discretized circuit equation including:

[0013] Based on the mathematical equations of the internal combustion engine and wind power bundling system equipment, the continuous-time behavior of each device in the system is obtained, the continuous time is discretized using the numerical integration discretization method, the state variables of each device at different time points are obtained, and the discrete circuit model of each device is constructed.

[0014] As a preferred solution of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system described in the present invention, wherein: connecting the discretized circuit models to each other to construct the overall circuit model of the internal combustion engine and wind power bundling system includes: based on the electrical connection relationship between each device in the internal combustion engine and wind power bundling system, determining the nodes and branches in the system, and using the node analysis method to establish the overall circuit model of the system.

[0015] As a preferred solution of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system of the present invention, wherein: the overall circuit model is divided based on internal and external nodes, and transferring the information of the internal nodes of the system to the external nodes includes: determining the internal and external nodes of the system, and establishing a node voltage equation for each node;

[0016] According to the node voltage equation, the node admittance matrix of the whole system is constructed;

[0017] Matrix transformation technology is used to transfer internal node information to external nodes to reduce the number of system nodes.

[0018] As a preferred solution of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system of the present invention, it also includes: the internal node information is transferred to the external node and represented as:

[0019]

[0020] Among them, Y 11 , Y 12 , Y 21 , Y 22 They are the block matrices after the original matrix is ​​divided into internal and external nodes, u is the node voltage, i is the node current, J is the historical current source, and the subscripts "EN" and "IN" represent the external and internal nodes respectively.

[0021] As a preferred solution of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system of the present invention, it also includes: the external node inverse solution internal node information is expressed as:

[0022]

[0023] In a second aspect, the present invention provides an electromagnetic transient rapid simulation system for an internal combustion engine and a wind power bundling system, comprising:

[0024] A discretization processing module is used to characterize the characteristics of each device in the internal combustion engine and wind power bundling system by using mathematical equations, and to discretize the mathematical equations to obtain discretized circuit equations, so as to obtain discretized circuit models of each device;

[0025] A system circuit model building module, used to connect the discrete circuit models to each other to build an overall circuit model of the internal combustion engine and wind power bundling system based on actual circuit connection relationships;

[0026] The simulation module is used to divide the overall circuit model based on internal and external nodes, and transfer the information of the internal nodes of the system to the external nodes to complete the electromagnetic transient simulation.

[0027] In a third aspect, the present invention provides a computing device, comprising:

[0028] Memory and processor;

[0029] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system are implemented.

[0030] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system.

[0031] Compared with the prior art, the present invention has the following beneficial effects: the present invention utilizes matrix transformation to transfer all the internal node information of the internal combustion engine and wind power bundling system to the external nodes, thereby reducing the number of equivalent nodes during system simulation, greatly reducing the amount of calculation during system solution, and improving the electromagnetic transient simulation speed. In addition, since there is no simplified equivalent in the matrix transformation process, the internal node information is completely retained, so the simulation accuracy of the present invention is very high. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0033] Figure 1 A schematic diagram of a method and system for rapid electromagnetic transient simulation of an internal combustion engine and wind power bundling system according to an embodiment of the present invention;

[0034] Figure 2 A diagram of a generator discretization circuit model of an electromagnetic transient rapid simulation method for an internal combustion engine and wind power bundling system and a system according to an embodiment of the present invention;

[0035] Figure 3 A diagram of a transformer discretization circuit model of an electromagnetic transient rapid simulation method for an internal combustion engine and wind power bundling system and a system according to an embodiment of the present invention;

[0036] Figure 4 An electromagnetic transient rapid simulation method for an internal combustion engine and wind power bundling system according to an embodiment of the present invention and an equivalent circuit diagram of the internal combustion engine and wind power bundling system after eliminating internal nodes of the system. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0038] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0039] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0040] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0041] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Example 1

[0044] Reference Figure 1 to Figure 4 , is an embodiment of the present invention, which provides an electromagnetic transient rapid simulation method for an internal combustion engine and a wind power bundling system, such as Figure 1 As shown, including:

[0045] S100: using mathematical equations to characterize the characteristics of each device in the internal combustion engine and wind power bundling system, and discretizing the mathematical equations to obtain discretized circuit equations to obtain discretized circuit models of each device;

[0046] In the embodiment of the present application, mathematical equations are used to characterize the characteristics of each device in the internal combustion engine and wind power bundling system, including:

[0047] The target physical model is obtained to describe the dynamic behavior of each device, the key state variables of each device are determined, and the mathematical equations of the internal combustion engine and wind power bundling system equipment are established based on the target physical model and state variables.

[0048] In an optional embodiment, a mathematical equation is used to characterize the permanent magnet synchronous generator in the wind turbine, and the equation includes a voltage equation, a flux equation and a motion equation;

[0049] Specifically, the voltage equation is expressed as:

[0050]

[0051] Among them, U is the permanent magnet synchronous generator stator and rotor voltage column vector, R is the resistance matrix, I is the permanent magnet synchronous generator stator and rotor current column vector, Ψ is the stator and rotor flux column vector, and e is the speed electromotive force column vector.

[0052] The magnetic flux equation is expressed as:

[0053] Ψ=LI+Ψ m

[0054] Where, L is the inductance matrix, Ψ m is the permanent magnet flux column vector.

[0055] Specifically, the parameters of the voltage equation and the flux equation are expressed as:

[0056]

[0057] Among them, ω r is the rotor electrical angle speed, Ψ f is the permanent magnet flux, subscripts d and q represent the d-axis and q-axis windings respectively; subscripts kd and kq represent the d-axis damping winding and q-axis damping winding respectively; subscripts akd and akq represent the relationship between phase a and the d-axis and q-axis.

[0058] The equation of motion is expressed as:

[0059]

[0060] Where J is the moment of inertia, K D is the mechanical damping coefficient, T m is the mechanical torque, T e is the electromagnetic torque of the generator.

[0061] In another optional embodiment, the transformer is represented by a mathematical equation:

[0062]

[0063] Among them, v Tis the transformer terminal voltage, R is the transformer resistance, L is the transformer inductance, i T is the transformer terminal current, N is the primary-to-secondary winding turns ratio, subscripts 1 and 2 represent the primary and secondary sides respectively, and m is the excitation winding parameter.

[0064] In the embodiment of the present application, the mathematical equation is discretized to obtain a discretized circuit equation including:

[0065] Based on the mathematical equations of the internal combustion engine and wind power bundling system equipment, the continuous-time behavior of each device in the system is obtained. The continuous time is discretized using the numerical integration discretization method to obtain the state variables of each device at different time points, and the discrete circuit model of each device is constructed.

[0066] For example, Figure 2 As shown in the figure, it is a discrete circuit model of a generator, such as Figure 3 As shown, this is the discrete circuit model of the transformer.

[0067] S200: Based on the actual circuit connection relationship, the discretized circuit models are connected to each other to construct an overall circuit model of the internal combustion engine and wind power bundling system;

[0068] In an embodiment of the present application, connecting the discrete circuit models to each other to construct an overall circuit model of the internal combustion engine and wind power bundling system includes: based on the electrical connection relationship between the various devices in the internal combustion engine and wind power bundling system, determining the nodes and branches in the system, and using the node analysis method to establish the overall circuit model of the system.

[0069] S300: The overall circuit model is divided based on internal and external nodes, and the information of the internal nodes of the system is transferred to the external nodes to complete the electromagnetic transient simulation.

[0070] In the embodiment of the present application, the overall circuit model is divided based on internal and external nodes, and transferring the information of the internal nodes of the system to the external nodes includes: determining the internal and external nodes of the system, and establishing a node voltage equation for each node;

[0071] According to the node voltage equation, the node admittance matrix of the whole system is constructed;

[0072] Matrix transformation technology is used to transfer internal node information to external nodes to reduce the number of system nodes.

[0073] It should be noted that the matrix before transformation is expressed as:

[0074]

[0075] In the embodiment of the present application, the internal node information is transferred to the external node as follows:

[0076]

[0077] Among them, Y 11 , Y 12 , Y 21 , Y 22 They are the block matrices after the original matrix is ​​divided into internal and external nodes, u is the node voltage, i is the node current, J is the historical current source, and the subscripts "EN" and "IN" represent the external and internal nodes respectively.

[0078] In the embodiment of the present application, it also includes: the external node reversely solves the internal node information to be expressed as:

[0079]

[0080] For example, Figure 4 As shown, this is an equivalent circuit model diagram of the internal combustion engine and wind power bundling system after eliminating internal nodes.

[0081] The present invention uses matrix transformation to transfer all the internal node information of the internal combustion engine and wind power bundling system to the external nodes, reducing the number of equivalent nodes during system simulation, greatly reducing the amount of calculation during system solution, and improving the electromagnetic transient simulation speed. In addition, since there is no simplified equivalent in the matrix transformation process, the internal node information is completely retained, so the simulation accuracy of the entire system is very high.

[0082] The above is a schematic scheme of an electromagnetic transient rapid simulation method for an internal combustion engine and wind power bundling system of this embodiment. It should be noted that the technical scheme of the electromagnetic transient rapid simulation system of this internal combustion engine and wind power bundling system and the technical scheme of the electromagnetic transient rapid simulation method for the internal combustion engine and wind power bundling system described above belong to the same concept, and the details of the technical scheme of the electromagnetic transient rapid simulation system of the internal combustion engine and wind power bundling system not described in detail in this embodiment can be referred to the description of the technical scheme of the electromagnetic transient rapid simulation method for the internal combustion engine and wind power bundling system described above.

[0083] In this embodiment, an electromagnetic transient rapid simulation system for an internal combustion engine and a wind power bundling system includes:

[0084] A discretization processing module is used to characterize the characteristics of each device in the internal combustion engine and wind power bundling system using mathematical equations, and discretize the mathematical equations to obtain discretized circuit equations to obtain discretized circuit models of each device;

[0085] The system circuit model building module is used to connect the discrete circuit models to build the overall circuit model of the internal combustion engine and wind power bundling system based on the actual circuit connection relationship;

[0086] The simulation module is used to divide the overall circuit model based on internal and external nodes, and transfer the information of the internal nodes of the system to the external nodes to complete the electromagnetic transient simulation.

[0087] This embodiment further provides a computing device, which is applicable to the electromagnetic transient rapid simulation method of an internal combustion engine and a wind power bundling system, and includes:

[0088] A memory and a processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the electromagnetic transient rapid simulation method for the internal combustion engine and wind power bundling system as proposed in the above embodiment.

[0089] This embodiment further provides a storage medium having a computer program stored thereon. When the program is executed by a processor, the method for realizing electromagnetic transient rapid simulation of an internal combustion engine and a wind power bundling system as proposed in the above embodiment is implemented.

[0090] The storage medium proposed in this embodiment and the electromagnetic transient rapid simulation method for an internal combustion engine and a wind power bundling system proposed in the above embodiment belong to the same inventive concept. For technical details not fully described in this embodiment, reference can be made to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0091] Through the above description of the implementation methods, the technicians in the relevant field can clearly understand that the present invention can be implemented by means of software and necessary general hardware, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ReadOnly, Memory, ROM), random access memory (RandomAccess Memory, RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform the methods of various embodiments of the present invention.

[0092] Example 2

[0093] Reference Figure 1 to Figure 4 , which is an embodiment of the present invention. This embodiment is different from the first embodiment in that this embodiment takes a coupling system of 14 18MW internal combustion engines and 14 10MW wind turbines as an example to verify the beneficial effects of the present invention.

[0094] In this embodiment, internal nodes are eliminated through matrix transformation, and the original 500-node circuit of the internal combustion engine and wind power bundling system is equivalent to a 4-node circuit containing only external nodes. Compared with the detailed model built by components in the component library of traditional electromagnetic transient simulation software, the simulation speed is increased by 1 to 2 orders of magnitude, and the maximum relative error is less than 4%. The present invention uses matrix transformation to transfer all internal node information of the internal combustion engine and wind power bundling system to external nodes, reducing the number of equivalent nodes during system simulation, greatly reducing the amount of calculation during system solution, and improving the electromagnetic transient simulation speed. Since there is no simplified equivalence in the matrix transformation process of the present invention, the internal node information is completely retained, so the simulation accuracy of the present invention is very high.

[0095] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A rapid electromagnetic transient simulation method for an internal combustion engine and wind power bundling system, characterized in that: include: Using mathematical equations to characterize the characteristics of each device in the internal combustion engine and wind power bundling system, and discretizing the mathematical equations to obtain discretized circuit equations to obtain discretized circuit models of each device; Based on the actual circuit connection relationship, the discretized circuit models are connected to each other to construct an overall circuit model of the internal combustion engine and the wind power bundling system; The overall circuit model is divided based on internal and external nodes, and the information of the internal nodes of the system is transferred to the external nodes to complete the electromagnetic transient simulation.

2. The electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system according to claim 1 is characterized in that: Mathematical equations are used to characterize the characteristics of each device in the internal combustion engine and wind power bundling system, including: The target physical model is obtained to describe the dynamic behavior of each device, the key state variables of each device are determined, and the mathematical equations of the internal combustion engine and wind power bundling system equipment are established based on the target physical model and state variables.

3. The electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system according to claim 2 is characterized in that: Discretization is performed on the mathematical equation to obtain a discretized circuit equation including: Based on the mathematical equations of the internal combustion engine and wind power bundling system equipment, the continuous-time behavior of each device in the system is obtained, the continuous time is discretized using the numerical integration discretization method, the state variables of each device at different time points are obtained, and the discrete circuit model of each device is constructed.

4. The electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system according to claim 3 is characterized in that: Connecting the discrete circuit models to each other to construct an overall circuit model of the internal combustion engine and wind power bundling system includes: determining nodes and branches in the system based on the electrical connection relationship between various devices in the internal combustion engine and wind power bundling system, and establishing the overall circuit model of the system using a node analysis method.

5. The electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system according to claim 4 is characterized in that: The overall circuit model is divided based on internal and external nodes, and transferring the information of the internal nodes of the system to the external nodes includes: determining the internal and external nodes of the system, and establishing a node voltage equation for each node; According to the node voltage equation, the node admittance matrix of the whole system is constructed; Matrix transformation technology is used to transfer internal node information to external nodes to reduce the number of system nodes.

6. The electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system according to claim 5 is characterized in that: It also includes: the internal node information is transferred to the external node as follows: Among them, Y 11 , Y 12 , Y 21 , Y 22 are the block matrices after the original matrix is ​​divided into internal and external nodes, u is the node voltage, i is the node current, J is the historical current source, and the subscripts "EN" and "IN" represent the external and internal nodes respectively.

7. The electromagnetic transient rapid simulation method of the internal combustion engine and wind power bundling system according to claim 6 is characterized in that: It also includes: the external node reverse solution of the internal node information is expressed as:

8. An electromagnetic transient rapid simulation system for internal combustion engine and wind power bundling system, characterized in that: include: A discretization processing module is used to characterize the characteristics of each device in the internal combustion engine and wind power bundling system by using mathematical equations, and to discretize the mathematical equations to obtain discretized circuit equations, so as to obtain discretized circuit models of each device; A system circuit model building module, used to connect the discrete circuit models to each other to build an overall circuit model of the internal combustion engine and wind power bundling system based on actual circuit connection relationships; The simulation module is used to divide the overall circuit model based on internal and external nodes, and transfer the information of the internal nodes of the system to the external nodes to complete the electromagnetic transient simulation.

9. An electronic device, comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the electromagnetic transient rapid simulation method for the internal combustion engine and wind power bundling system according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the electromagnetic transient rapid simulation method for an internal combustion engine and a wind power bundling system according to any one of claims 1 to 7.

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