Modeling method, system and equipment for power multiplication of transformer, medium and product

Abstract

The invention relates to the technical field of electromagnetic transient modeling, and discloses a modeling method, system, equipment, medium and product for transformer power multiplication, and the method comprises the steps: constructing a port voltage equation of a target transformer, carrying out a series of operation on the port voltage equation of the target transformer, obtaining a port voltage time domain equation related to a time domain, and carrying out the calculation of the port voltage time domain equation; according to the method, a port voltage time-domain equation is obtained, discretization processing is performed on the port voltage time-domain equation, a self-admittance matrix and injection current of the target transformer are determined by using the port voltage time-domain discretization equation obtained through discretization processing, and the power of the target transformer can be multiplied by multiplying the self-admittance matrix and the injection current. Therefore, detailed electromagnetic transient simulation on all the power generation units does not need to be carried out by a large number of computing resources, only multiplication parameters of the transformer are modified, the computing cost is reduced, and meanwhile the modeling efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic transient modeling, and in particular to a modeling method, system, equipment, medium and product for transformer power multiplication. Background Art

[0002] In recent years, with the access of key entities such as large-scale offshore wind power, the scale and complexity of the power system will increase dramatically. Large-scale and high-proportion power electronic equipment has high switching frequency and large computing volume. A new energy station may have hundreds of power generation units, which is a big challenge for detailed electromagnetic transient simulation of all power generation units.

[0003] At present, when modeling the electromagnetic transient state of a transformer, a large amount of computing resources is required to perform detailed electromagnetic transient modeling of all power generation units, resulting in low efficiency of electromagnetic transient modeling of the transformer. Summary of the invention

[0004] In view of this, the present invention provides a modeling method, system, device, medium and product for transformer power multiplication, which solves the technical problem of low efficiency of electromagnetic transient modeling of transformer.

[0005] A first aspect of the present invention provides a modeling method for transformer power doubling, comprising:

[0006] Determine a port voltage equation of the target transformer according to a T-type equivalent circuit of the target transformer;

[0007] Converting the port voltage equation into a port voltage equation matrix;

[0008] Performing Laplace domain transformation on the port voltage equation matrix to obtain a port voltage time domain equation;

[0009] Discretizing the port voltage time-domain equation to obtain a port voltage time-domain discrete equation;

[0010] Determine the self-admittance matrix and injection current of the target transformer according to the time-domain discrete equation of the port voltage;

[0011] The power of the target transformer is multiplied according to the self-admittance matrix and the injected current to form a power multiplication simulation model of the target transformer.

[0012] Optionally, the port voltage equation is:

[0013]

[0014]

[0015] In the formula, , are the voltages on the primary and secondary sides of the target transformer, is the equivalent resistance of the target transformer, , are the currents on the primary and secondary sides of the target transformer, is the imaginary unit, is the leakage reactance of the target transformer, is the magnetizing reactance of the target transformer.

[0016] Optionally, converting the port voltage equation into a port voltage equation matrix includes:

[0017] Converting the per-unit value of the port voltage equation into a nominal value to obtain the port voltage equation in a nominal value form;

[0018] The port voltage equation in the form of a nominal value is subjected to matrix transformation to obtain a port voltage equation matrix.

[0019] Optionally, the discretizing the port voltage time-domain equation to obtain the port voltage time-domain discrete equation includes:

[0020] The port voltage time domain equation is discretized at a time step by using the trapezoidal integration method to obtain the port voltage time domain discrete equation, which is:

[0021]

[0022] In the formula, , They are time t, The voltage at the moment, is the step interval, , are all merge matrices, , They are time t, The current at the moment, is the system frequency.

[0023] Optionally, determining the self-admittance matrix and the injected current of the target transformer according to the time-domain discrete equation of the port voltage includes:

[0024] The port voltage time-domain discrete equation is simplified to obtain the port voltage time-domain combined equation, which is:

[0025]

[0026] In the formula, , All are combined items;

[0027] in,

[0028]

[0029]

[0030] The port voltage time domain merging equation is converted into a matrix element form to obtain the port admittance matrix of the target transformer, wherein the port admittance matrix includes a self-admittance matrix and an injected current; wherein the port admittance matrix is:

[0031]

[0032] In the formula, is the self-admittance matrix, is the current matrix, , , , They are all self-admittance elements. , are the injection current and the outflow current respectively.

[0033] Optionally, the power multiplication simulation model of the target transformer is:

[0034] In the formula, k is the multiplication factor.

[0035] In a second aspect, the present invention further provides a modeling system for transformer power multiplication, comprising:

[0036] A port equation building module, used to determine a port voltage equation of the target transformer according to a T-type equivalent circuit of the target transformer;

[0037] An equation conversion module, used for converting the port voltage equation into a port voltage equation matrix;

[0038] A time domain transformation module, used for performing Laplace domain transformation on the port voltage equation matrix to obtain a port voltage time domain equation;

[0039] An equation discretization module is used to discretize the port voltage time domain equation to obtain a port voltage time domain discrete equation;

[0040] An admittance construction module, used to determine the self-admittance matrix and injection current of the target transformer according to the time-domain discrete equation of the port voltage;

[0041] The multiplication simulation module is used to multiply the power of the target transformer according to the self-admittance matrix and the injected current to form a power multiplication simulation model of the target transformer.

[0042] In a third aspect, the present invention further provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the transformer power doubling modeling method as described in the first aspect.

[0043] In a fourth aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed, implements the transformer power doubling modeling method as described in the first aspect.

[0044] In a fifth aspect, the present invention further provides a computer program product, comprising a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer executes the modeling method for transformer power doubling as described in the first aspect.

[0045] It can be seen from the above technical solutions that the present invention constructs a port voltage equation of a target transformer, performs a series of operations on the port voltage equation of the target transformer, obtains a port voltage time-domain equation about the time domain, and discretizes the port voltage time-domain equation. The self-admittance matrix and the injected current of the target transformer are determined by using the port voltage time-domain discrete equation obtained by the discretization process. By multiplying the self-admittance matrix and the injected current, the power of the target transformer can be multiplied, so that a large amount of computing resources is not required to perform detailed electromagnetic transient simulation on all power generation units. Only the transformer is modified by multiplication parameters, which reduces the computing cost and improves the modeling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative labor.

[0047] Figure 1 An application environment of a transformer power doubling modeling method provided by an embodiment of the present invention;

[0048] Figure 2 A flow chart of a transformer power doubling modeling method provided by an embodiment of the present invention;

[0049] Figure 3 A T-type equivalent circuit diagram of a target transformer provided by an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the structure of a transformer power multiplication modeling system provided by an embodiment of the present invention;

[0051] Figure 5 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0052] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] The transformer power multiplication modeling method provided in the embodiment of the present application can be applied to Figure 1 In the application environment shown. Among them, the electromagnetic transient modeling software communicates with the server 102 through the network. The data storage system can store the data that the server 102 needs to process. The data storage system can be integrated on the server 102, or it can be placed on the cloud or other network servers. The server 102 determines the port voltage equation of the target transformer according to the T-type equivalent circuit of the target transformer; converts the port voltage equation into a port voltage equation matrix; performs a Laplace domain transformation on the port voltage equation matrix to obtain a port voltage time domain equation; discretizes the port voltage time domain equation to obtain a port voltage time domain discrete equation; determines the self-admittance matrix and injection current of the target transformer according to the port voltage time domain discrete equation; multiplies the power of the target transformer according to the self-admittance matrix and the injection current to form a power multiplication simulation model of the target transformer. The server 102 can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0054] like Figure 2 As shown, the embodiment of the present application provides a modeling method for transformer power doubling, and the method is applied to Figure 1 The server 102 in the example is used as an example to illustrate the method, which includes the following steps S1 to S6. Among them:

[0055] Step S1, determining a port voltage equation of a target transformer according to a T-type equivalent circuit of the target transformer.

[0056] The target transformer can be a single-phase transformer. The T-type equivalent circuit of the single-phase transformer is as follows: Figure 3 As shown in the figure, the port voltage equation of the target transformer is determined based on the T-type equivalent circuit of the single-phase transformer:

[0057]

[0058]

[0059] In the formula, , are the voltages on the primary and secondary sides of the target transformer, is the equivalent resistance of the target transformer, , are the currents on the primary and secondary sides of the target transformer, is the imaginary unit, is the leakage reactance of the target transformer, is the magnetizing reactance of the target transformer.

[0060] Among them, the values ​​in the port voltage equation of the target transformer are all per-unit values.

[0061] Step S2: convert the port voltage equation into a port voltage equation matrix.

[0062] The step S2 of converting the port voltage equation into a port voltage equation matrix includes:

[0063] Step S201, converting the per-unit value of the port voltage equation into a nominal value to obtain the port voltage equation in the form of a nominal value.

[0064] Among them, the port voltage equation in nominal value form is:

[0065]

[0066]

[0067] In the formula, , are the rated voltages of the primary and secondary sides of the transformer, is the rated capacity of the transformer.

[0068] Step S202: Perform matrix transformation on the port voltage equation in the form of a nominal value to obtain a port voltage equation matrix.

[0069] Among them, the port voltage equation matrix is:

[0070]

[0071]

[0072] In the formula, , All are merged matrices.

[0073] Step S3: Perform Laplace domain transformation on the port voltage equation matrix to obtain the port voltage time domain equation.

[0074] In which, the equation After Laplace domain transformation, the time domain equation of the port voltage is obtained as follows:

[0075]

[0076] In the formula, is the system frequency.

[0077] Step S4: discretize the port voltage time-domain equation to obtain the port voltage time-domain discrete equation.

[0078] Specifically, the trapezoidal integration method is used to discretize the port voltage time domain equation at a time step to obtain the port voltage time domain discrete equation. The port voltage time domain discrete equation is:

[0079]

[0080] In the formula, , They are time t, The voltage at the moment, is the step interval, , are all merge matrices, , They are time t, The current at the moment, is the system frequency.

[0081] Step S5: determining the self-admittance matrix and injection current of the target transformer according to the time-domain discrete equation of the port voltage.

[0082] Wherein, determining the self-admittance matrix and the injected current of the target transformer according to the time-domain discrete equation of the port voltage in step S5 includes:

[0083] Step S501, simplify the discrete time-domain equation of the port voltage to obtain the combined time-domain equation of the port voltage. The combined time-domain equation of the port voltage is:

[0084]

[0085] In the formula, , All are combined items;

[0086] in,

[0087]

[0088]

[0089] The simplified operation is to shift the terms and merge the similar terms of the discrete equation of the port voltage in the time domain.

[0090] Step S502: Convert the port voltage time domain merging equation into a matrix element form to obtain the port admittance matrix of the target transformer, where the port admittance matrix includes a self-admittance matrix and an injected current; wherein the port admittance matrix is:

[0091]

[0092] In the formula, is the self-admittance matrix, is the current matrix, , , , They are all self-admittance elements. , are the injection current and the outflow current respectively.

[0093] Step S6: multiply the power of the target transformer according to the self-admittance matrix and the injected current to form a power multiplication simulation model of the target transformer.

[0094] Among them, the self-admittance matrix and the injected current can be multiplied according to the preset multiplication factor, so as to realize the function of multiplying the primary side power of the single-phase transformer by k times and form a power multiplication simulation model of the target transformer.

[0095] Among them, the power multiplication simulation model of the target transformer is:

[0096] In the formula, k is the multiplication factor.

[0097] It should be noted that the embodiment of the present application constructs a port voltage equation of the target transformer, performs a series of operations on the port voltage equation of the target transformer, obtains a port voltage time domain equation about the time domain, and discretizes the port voltage time domain equation. The self-admittance matrix and the injected current of the target transformer are determined by using the port voltage time domain discrete equation obtained by the discretization process. By multiplying the self-admittance matrix and the injected current, the power of the target transformer can be multiplied, thereby eliminating the need for a large amount of computing resources to perform detailed electromagnetic transient simulation on all power generation units. Only the transformer needs to be modified by multiplying the multiplication parameters, thereby reducing the computing cost and improving the modeling efficiency.

[0098] Based on the same inventive concept, an embodiment of the present application further provides a transformer power doubling modeling system for implementing the above-mentioned transformer power doubling modeling method.

[0099] The implementation solution for solving the problem provided by the system is similar to the implementation solution recorded in the above method. Therefore, the specific limitations in one or more transformer power doubling modeling system embodiments provided below can refer to the limitations on the transformer power doubling modeling method above, and will not be repeated here.

[0100] like Figure 4 As shown, the embodiment of the present application also provides a modeling system for transformer power multiplication, including:

[0101] A port equation building module 100 is used to determine a port voltage equation of a target transformer according to a T-type equivalent circuit of the target transformer;

[0102] An equation conversion module 200, used to convert the port voltage equation into a port voltage equation matrix;

[0103] A time domain transformation module 300 is used to perform Laplace domain transformation on the port voltage equation matrix to obtain a port voltage time domain equation;

[0104] The equation discretization module 400 is used to discretize the port voltage time domain equation to obtain the port voltage time domain discrete equation;

[0105] The admittance construction module 500 is used to determine the self-admittance matrix and the injection current of the target transformer according to the time-domain discrete equation of the port voltage;

[0106] The multiplication simulation module 600 is used to multiply the power of the target transformer according to the self-admittance matrix and the injected current to form a power multiplication simulation model of the target transformer.

[0107] In some embodiments, the port voltage equation is:

[0108]

[0109]

[0110] In the formula, , are the voltages on the primary and secondary sides of the target transformer, is the equivalent resistance of the target transformer, , are the currents on the primary and secondary sides of the target transformer, is the imaginary unit, is the leakage reactance of the target transformer, is the magnetizing reactance of the target transformer.

[0111] In some embodiments, the equation conversion module 200 is used to convert the per-unit value of the port voltage equation into a nominal value to obtain the port voltage equation in the form of a nominal value; and perform a matrix transformation on the port voltage equation in the form of a nominal value to obtain a port voltage equation matrix.

[0112] In some embodiments, the equation discretization module 400 is used to discretize the port voltage time domain equation at a time step using a trapezoidal integration method to obtain a port voltage time domain discrete equation, and the port voltage time domain discrete equation is:

[0113]

[0114] In the formula, , They are time t, The voltage at the moment, is the step interval, , are all merge matrices, , They are time t, The current at the moment, is the system frequency.

[0115] In some embodiments, the admittance construction module 500 is used to simplify the discrete time-domain equation of the port voltage to obtain the combined time-domain equation of the port voltage. The combined time-domain equation of the port voltage is:

[0116]

[0117] In the formula, , All are combined items;

[0118] in,

[0119]

[0120]

[0121] The port voltage time domain merging equation is converted into a matrix element form to obtain the port admittance matrix of the target transformer. The port admittance matrix includes the self-admittance matrix and the injected current. The port admittance matrix is:

[0122]

[0123] In the formula, is the self-admittance matrix, is the current matrix, , , , They are all self-admittance elements. , are the injection current and the outflow current respectively.

[0124] In some embodiments, the power multiplication simulation model of the target transformer is:

[0125] In the formula, k is the multiplication factor.

[0126] like Figure 5 As shown, an embodiment of the present application further provides an electronic device 10, including a memory 20 and a processor 30, wherein a computer program is stored in the memory 20, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the modeling method for transformer power doubling as in any of the above embodiments.

[0127] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed, the steps of the transformer power doubling modeling method as in any of the above embodiments are implemented.

[0128] An embodiment of the present application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium, and the computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer executes the steps of the modeling method for transformer power doubling in any of the above embodiments.

[0129] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems, electronic devices, computer storage media and computer program products can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0130] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatus.

[0131] In several embodiments provided by the present invention, it is understood that each box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and a part of a module, a program segment or a code includes one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in a different order from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved.

[0132] In the several embodiments provided by the present invention, it should be understood that the disclosed systems, electronic devices, computer storage media, computer program products and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0133] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0134] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0135] If the integrated unit is implemented in the form of 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 the present invention, 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. The computer software product is stored in a storage medium, including several instructions for executing all or part of the steps of the method described in each embodiment of the present invention through a computer device (which can be a personal computer, server, or network device, etc.). The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk, etc. Various media that can store program codes.

[0136] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A modeling method for transformer power multiplication, characterized in that: include: Determine a port voltage equation of the target transformer according to a T-type equivalent circuit of the target transformer; Converting the port voltage equation into a port voltage equation matrix; Performing Laplace domain transformation on the port voltage equation matrix to obtain a port voltage time domain equation; Discretizing the port voltage time-domain equation to obtain a port voltage time-domain discrete equation; Determine the self-admittance matrix and injection current of the target transformer according to the time-domain discrete equation of the port voltage; The power of the target transformer is multiplied according to the self-admittance matrix and the injected current to form a power multiplication simulation model of the target transformer.

2. The modeling method for transformer power multiplication according to claim 1, characterized in that: The port voltage equation is: In the formula, , are the voltages on the primary and secondary sides of the target transformer, is the equivalent resistance of the target transformer, , are the currents on the primary and secondary sides of the target transformer, is the imaginary unit, is the leakage reactance of the target transformer, is the magnetizing reactance of the target transformer.

3. The modeling method for transformer power multiplication according to claim 1, characterized in that: The step of converting the port voltage equation into a port voltage equation matrix comprises: Converting the per-unit value of the port voltage equation into a nominal value to obtain the port voltage equation in a nominal value form; The port voltage equation in the form of a nominal value is subjected to matrix transformation to obtain a port voltage equation matrix.

4. The modeling method for transformer power multiplication according to claim 1, characterized in that: The discretization process is performed on the port voltage time domain equation to obtain the port voltage time domain discrete equation, including: The port voltage time domain equation is discretized at a time step by using the trapezoidal integration method to obtain the port voltage time domain discrete equation, which is: In the formula, , They are time t, The voltage at the moment, is the step interval, , are all merge matrices, , They are time t, The current at the moment, is the system frequency.

5. The modeling method for transformer power multiplication according to claim 4, characterized in that: The step of determining the self-admittance matrix and the injected current of the target transformer according to the time-domain discrete equation of the port voltage comprises: The port voltage time-domain discrete equation is simplified to obtain the port voltage time-domain combined equation, which is: In the formula, , All are combined items; in, The port voltage time domain merging equation is converted into a matrix element form to obtain the port admittance matrix of the target transformer, wherein the port admittance matrix includes a self-admittance matrix and an injected current; wherein the port admittance matrix is: In the formula, is the self-admittance matrix, is the current matrix, , , , They are all self-admittance elements. , are the injection current and the outflow current respectively.

6. The modeling method for transformer power multiplication according to claim 5, characterized in that: The power multiplication simulation model of the target transformer is: In the formula, k is the multiplication factor.

7. A modeling system for transformer power multiplication, characterized in that: include: A port equation building module, used to determine a port voltage equation of the target transformer according to a T-type equivalent circuit of the target transformer; An equation conversion module, used for converting the port voltage equation into a port voltage equation matrix; A time domain transformation module, used for performing Laplace domain transformation on the port voltage equation matrix to obtain a port voltage time domain equation; An equation discretization module is used to discretize the port voltage time domain equation to obtain a port voltage time domain discrete equation; An admittance construction module, used to determine the self-admittance matrix and injection current of the target transformer according to the time-domain discrete equation of the port voltage; The multiplication simulation module is used to multiply the power of the target transformer according to the self-admittance matrix and the injected current to form a power multiplication simulation model of the target transformer.

8. An electronic device, characterized in that: The method comprises a memory and a processor, wherein a computer program is stored in the memory, and when the computer program is executed by the processor, the processor executes the steps of the transformer power doubling modeling method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the modeling method for transformer power doubling according to any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that The computer program product comprises a computer program stored on a non-transitory computer-readable storage medium, wherein the computer program comprises program instructions, wherein when the program instructions are executed by a computer, the computer is caused to execute the modeling method for transformer power multiplication according to any one of claims 1 to 6.

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