A method, system, device, medium, and product of modeling transformer power multiplication

Abstract

The application relates to the technical field of electromagnetic transient modeling, and discloses a modeling method, system, device, medium and product for power multiplication of a transformer. The port voltage equation of a target transformer is constructed, a series of operations are performed on the port voltage equation of the target transformer, a port voltage time domain equation about a time domain is obtained, the port voltage time domain equation is discretized, the self-inductance matrix and the injected current of the target transformer are determined by using the port voltage time domain discrete equation obtained through the discretization, and the power of the target transformer is multiplied by multiplying the self-inductance matrix and the injected current, so that electromagnetic transient simulation of all power generation units does not need to be performed in detail by using a large amount of computing resources, only the multiplication parameters of the transformer need to be modified, the computing cost is reduced, and the modeling efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic transient modeling, and in particular to a transformer power multiplication modeling method, system, device, medium and product. BACKGROUND

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

[0003] At present, when modeling the electromagnetic transient of the transformer, a large amount of calculation resources is needed to model the electromagnetic transient of all power generation units in detail, resulting in low efficiency of electromagnetic transient modeling of the transformer. SUMMARY

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

[0005] The first aspect of the present application provides a transformer power multiplication modeling method, comprising:

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

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

[0008] performing Laplace domain conversion 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] determining a self-inductance matrix and an injected current of the target transformer according to the port voltage time domain discrete equation;

[0011] multiplying the power of the target transformer according to the self-inductance 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, , voltage of the primary side and the secondary side of the target transformer respectively, equivalent resistance of the target transformer, , current of the primary side and the secondary side of the target transformer respectively, imaginary unit, leakage reactance of the target transformer, magnetizing reactance of the target transformer.

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

[0017] converting the per-unit value of the port voltage equation into a named value to obtain a named-value form of the port voltage equation;

[0018] performing matrix transformation on the named-value form of the port voltage equation to obtain the port voltage equation matrix.

[0019] Optionally, the discretization processing of the port voltage time-domain equation to obtain a port voltage time-domain discrete equation comprises:

[0020] discretization processing of the port voltage time-domain equation in a time step using the trapezoidal integral method to obtain a port voltage time-domain discrete equation, the port voltage time-domain discrete equation being:

[0021]

[0022] wherein, , voltage at time t, voltage at time t+Δt, step interval, , both being a merging matrix, , current at time t, current at time t+Δt, system frequency.

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

[0024] simplifying operation of the port voltage time-domain discrete equation to obtain a port voltage time-domain merging equation, the port voltage time-domain merging equation being:

[0025]

[0026] wherein, , both being a merging term;

[0027] wherein,

[0028]

[0029]

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

[0031]

[0032] wherein, is a self-admittance matrix, is a current matrix, , , , all are self-admittance elements, , are an injected current and an outflow current respectively.

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

[0034] wherein, k is a multiplication multiple.

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

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

[0037] an equation conversion module, configured to convert the port voltage equation into a port voltage equation matrix;

[0038] a time domain transformation module, configured to perform Laplace domain conversion on the port voltage equation matrix to obtain a port voltage time domain equation;

[0039] an equation discretization module, configured to perform discretization processing on the port voltage time domain equation to obtain a port voltage time domain discrete equation;

[0040] an admittance construction module, configured to determine a self-admittance matrix and an injected current of the target transformer according to the port voltage time domain discrete equation;

[0041] a multiplication simulation module, configured to multiply 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 application also provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the computer program is executed by the processor to make the processor execute the steps of the modeling method for transformer power multiplication according to the first aspect.

[0043] In a fourth aspect, the present application also provides a computer readable storage medium, which stores a computer program, and the computer program is executed to implement the modeling method for transformer power multiplication according to the first aspect.

[0044] In a fifth aspect, the present application also provides a computer program product, which comprises a computer program stored in a non-transitory computer readable storage medium, and the computer program comprises program instructions, wherein the program instructions are executed by a computer to make the computer execute the modeling method for transformer power multiplication according to the first aspect.

[0045] From the above technical solutions, it can be seen that, by constructing the port voltage equation of the target transformer, and performing a series of operations on the port voltage equation of the target transformer, the port voltage time domain equation about the time domain is obtained, and the port voltage time domain equation is discretized, and the self-inductance matrix and the injected current of the target transformer are determined by using the port voltage time domain discrete equation obtained by the discretization, and by multiplying the self-inductance matrix and the injected current, the power of the target transformer can be multiplied, so that a large amount of computing resources is not needed to perform detailed electromagnetic transient simulation on all power generation units, only the transformer is modified and multiplied, the computing cost is reduced, and the modeling efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0047] Figure 1 An application environment of the modeling method for transformer power multiplication provided by the embodiments of the present application;

[0048] Figure 2 A flowchart of the modeling method for transformer power multiplication provided by the embodiments of the present application;

[0049] Figure 3 A T-type equivalent circuit diagram of the target transformer provided by the embodiments of the present application;

[0050] Figure 4 A structural schematic diagram of a modeling system of transformer power multiplication provided for an embodiment of the present application;

[0051] Figure 5 A structural schematic diagram of an electronic device provided for an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] The modeling method of transformer power multiplication provided by the embodiments of the present application can be applied to the application environment as shown in Figure 1 . The electromagnetic transient modeling software communicates with the server 102 through a network. The data storage system can store the data required to be processed by the server 102. The data storage system can be integrated on the server 102, or 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 Laplace domain conversion on the port voltage equation matrix to obtain a port voltage time domain equation; performs discretization processing on the port voltage time domain equation to obtain a port voltage time domain discrete equation; determines the self-inductance matrix and the injected 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-inductance matrix and the injected 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 a distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

[0054] As shown in Figure 2 , the present application provides a modeling method of transformer power multiplication. Taking the server 102 in Figure 1 as an example, the method includes the following steps S1 to S6. Wherein:

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

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

[0057]

[0058]

[0059] wherein, , are the voltage of the primary side and the secondary side of the target transformer respectively, is the equivalent resistance of the target transformer, , are the current of the primary side and the secondary side of the target transformer respectively, is the unit of the imaginary part, is the leakage reactance of the target transformer, is the excitation reactance of the target transformer.

[0060] wherein, the values in the port voltage equation of the target transformer are all in per unit.

[0061] Step S2, converting the port voltage equation into a port voltage equation matrix.

[0062] wherein, the converting the port voltage equation into a port voltage equation matrix in step S2 comprises:

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

[0064] wherein, the named value form of the port voltage equation is:

[0065]

[0066]

[0067] wherein, , are the rated voltage of the primary side and the secondary side of the transformer respectively, is the rated capacity of the transformer.

[0068] Step S202, performing matrix transformation on the named value form of the port voltage equation, to obtain a port voltage equation matrix.

[0069] wherein, the port voltage equation matrix is:

[0070]

[0071]

[0072] wherein, , are all the merging matrices.

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

[0074] Among them, the equation Performing a Laplace domain transformation, the time-domain equation for the port voltage is obtained as follows:

[0075]

[0076] In the formula, This refers to 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 integral method is used to discretize the port voltage time-domain equation at one time step, resulting in the port voltage time-domain discrete equation:

[0079]

[0080] In the formula, , They are time t and t, respectively Voltage at time, The step interval is... , All are merged matrices. , They are time t and t, respectively Current at any moment This refers to the system frequency.

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

[0082] Among them, step S5, which involves determining the self-admittance matrix and injection current of the target transformer based on the time-domain discrete equation of the port voltage, includes:

[0083] Step S501: Simplify the time-domain discrete 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 as follows:

[0084]

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

[0086] in,

[0087]

[0088]

[0089] Wherein, the simplified operation is to move the term and combine the like terms of the port voltage time domain discrete equation.

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

[0091]

[0092] In the formula, The self-admittance matrix is The current matrix is , , , All are self-admittance elements, , The injected current and the outflow current are 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] Wherein, the self-admittance matrix and the injected current can be multiplied according to a preset multiplication multiple, that is, the function of multiplying the power of the primary side of the single-phase transformer by k times can be realized, and the power multiplication simulation model of the target transformer is formed.

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

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

[0097] It should be noted that, in the embodiment of the application, the port voltage equation of the target transformer is constructed, and a series of operations are performed on the port voltage equation of the target transformer to obtain the port voltage time domain equation about the time domain, and the port voltage time domain equation is discretized to determine the self-admittance matrix and the injected current of the target transformer by using the port voltage time domain discrete equation obtained by the discretization processing. 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 needed to perform detailed electromagnetic transient simulation on all power generation units, only the transformer is modified and multiplied, the computing cost is reduced, and the modeling efficiency is improved.

[0098] Based on the same inventive concept, the embodiment of the application also provides a transformer power multiplication modeling system for realizing the transformer power multiplication modeling method.

[0099] The solution provided by the system is similar to the implementation scheme described in the above method, so the specific definition in one or more transformer power multiplication modeling system embodiments provided below can refer to the definition of the transformer power multiplication modeling method in the above, which will not be repeated here.

[0100] As Figure 4 shown, the embodiment of the present application further provides a transformer power multiplication modeling system, comprising:

[0101] A port equation construction module 100 is configured to determine a port voltage equation of the target transformer according to a T-type equivalent circuit of the target transformer.

[0102] An equation conversion module 200 is configured to convert the port voltage equation into a port voltage equation matrix.

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

[0104] An equation discretization module 400 is configured to perform discretization processing on the port voltage time domain equation to obtain a port voltage time domain discrete equation.

[0105] An admittance construction module 500 is configured to determine a self-admittance matrix and an injected current of the target transformer according to the port voltage time domain discrete equation.

[0106] A multiplication simulation module 600 is configured 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] wherein, , are voltages of the primary side and the secondary side of the target transformer, respectively, is an equivalent resistance of the target transformer, , are currents of the primary side and the secondary side of the target transformer, respectively, is an imaginary unit, is a leakage reactance of the target transformer, is an excitation reactance of the target transformer.

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

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

[0113]

[0114] wherein, , are voltages at the time t and the time t+Δt respectively, is a step interval, , are all merging matrices, , are currents at the time t and the time t+Δt respectively, is a system frequency.

[0115] In some embodiments, the admittance construction module 500 is configured to perform a simplification operation on the port voltage time-domain discrete equation to obtain a port voltage time-domain merging equation, the port voltage time-domain merging equation being:

[0116]

[0117] wherein, , are all merging terms;

[0118] wherein,

[0119]

[0120]

[0121] convert the port voltage time-domain merging equation into a matrix element form to obtain a port admittance matrix of the target transformer, the port admittance matrix including a self-admittance matrix and an injected current; wherein the port admittance matrix is:

[0122]

[0123] wherein, is the self-admittance matrix, is a current matrix, , , , are all self-admittance elements, ​​, These are the injection current and the outflow current, respectively.

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

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

[0126] like Figure 5 As shown, this application embodiment also provides an electronic device 10, including a memory 20 and a processor 30. The memory 20 stores a computer program. When the computer program is executed by the processor 30, the processor 30 performs the steps of the transformer power multiplication modeling method as described in any of the above embodiments.

[0127] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed, implements the steps of the transformer power multiplication modeling method as described in any of the above embodiments.

[0128] This application also provides a computer program product, which includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions, wherein when the program instructions are executed by a computer, the computer performs the steps of the transformer power multiplication modeling method as described in any of the above embodiments.

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

[0130] It should be noted that the terms "comprising" and "having" and any variations thereof in the specification, claims and accompanying drawings of this invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products or devices.

[0131] In several embodiments provided by the present application, it can be understood that each block in the flowchart or block diagram can represent a module, a segment or a portion of code which contains one or more executable instructions for implementing the specified logic function. It should also be noted that in some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figure. For example, two blocks shown in succession may, in fact, be executed substantially concurrently or in the reverse order, depending on the functionality involved.

[0132] In several embodiments provided by the present application, it should be understood that the disclosed system, electronic device, computer storage medium, computer program product and method can be implemented in other manners. For example, the described apparatus embodiments are merely illustrative, and the division of units can be different from the embodiment. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections can be indirect couplings or communication connections through some interfaces, devices or units, and can be in electrical, mechanical or other forms.

[0133] The units described as separated components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e. can be located in one place or can be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purposes of the embodiments.

[0134] In addition, each functional unit in the embodiments of the present application can be integrated in a processing unit, or each unit can exist physically as a separate unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware, or in the form of a software functional unit.

[0135] If the integrated unit is implemented in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for executing all or part of the steps of the method described in various embodiments of the present application by a computer device (which can be a personal computer, a server, or a network device, etc.). The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (English full name: Read-Only Memory, English abbreviation: ROM), a random access memory (English full name: Random Access Memory, English abbreviation: RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0136] The above embodiments are only used to illustrate the technical solutions of the present application, not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of modeling transformer power multiplication, characterized by, The method comprises the following steps: determining 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 conversion on the port voltage equation matrix to obtain a port voltage time domain equation; performing discretization processing on the port voltage time domain equation to obtain a port voltage time domain discrete equation; determining a self-admittance matrix and an injected current of the target transformer according to the port voltage time domain discrete equation, comprising: performing simplified operation on the port voltage time domain discrete equation to obtain a port voltage time domain combined equation, wherein the port voltage time domain combined equation is: ； wherein , are combined terms; is the current at time t; is the voltage at time t; wherein, ； ； wherein , are merging matrices, is a step interval, is a system frequency, is a voltage at the moment, is a current at the moment; converting the port voltage time domain combined equation into a matrix element form to obtain a port admittance matrix of the target transformer, wherein the port admittance matrix comprises the self-admittance matrix and the injected current; and wherein the port admittance matrix is: ； wherein is the self-impedance matrix, is the current matrix, , , , are self-impedance elements, , are the injected and outflowing currents, respectively. multiplying 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; wherein the power multiplication simulation model of the target transformer is: ； wherein, k is a multiplication multiple.

2. The method of claim 1, wherein, The port voltage equation is: ； ； wherein , are the voltages of the primary and secondary side of the target transformer, respectively, is the equivalent resistance of the target transformer, , are the currents of the primary and secondary side of the target transformer, respectively, is the imaginary unit, is the leakage reactance of the target transformer, is the magnetizing reactance of the target transformer.

3. The method of claim 1, wherein, The converting the port voltage equation into a port voltage equation matrix comprises: converting a per-unit value of the port voltage equation into a named value to obtain a named value form of the port voltage equation; performing matrix transformation on the named value form of the port voltage equation to obtain the port voltage equation matrix.

4. The method of claim 1, wherein, The performing discretization processing on the port voltage time domain equation to obtain a port voltage time domain discrete equation comprises: performing discretization processing on the port voltage time domain equation in one time step by using a trapezoidal integration method to obtain a port voltage time domain discrete equation, wherein the port voltage time domain discrete equation is: 。 5. A modeling system for transformer power multiplication, characterized by, The method comprises the following steps: a port equation construction module, configured 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, configured to convert the port voltage equation into a port voltage equation matrix; a time domain transformation module, configured to perform Laplace domain conversion on the port voltage equation matrix to obtain a port voltage time domain equation; an equation discretization module, configured to perform discretization processing on the port voltage time domain equation to obtain a port voltage time domain discrete equation; an admittance construction module, configured to determine a self-admittance matrix and an injected current of the target transformer according to the port voltage time domain discrete equation; determining a self-admittance matrix and an injected current of the target transformer according to the port voltage time domain discrete equation, comprising: performing simplified operation on the port voltage time domain discrete equation to obtain a port voltage time domain combined equation, wherein the port voltage time domain combined equation is: ； wherein , are the combined terms; is the current at time t; is the voltage at time t; wherein, ； ； wherein , are merging matrices, is a step interval, is a system frequency, is a voltage at the moment, is a current at the moment; converting the port voltage time domain combined equation into a matrix element form to obtain a port admittance matrix of the target transformer, wherein the port admittance matrix comprises the self-admittance matrix and the injected current; and wherein the port admittance matrix is: ； wherein is the self-impedance matrix, is the current matrix, , , , are self-impedance elements, , are the injected and outflowing currents, respectively; a multiplication simulation module, configured to multiply 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; wherein the power multiplication simulation model of the target transformer is: ； wherein k is a multiplication factor.

6. An electronic device, comprising: A computer program product comprising a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by a computer, cause the computer to perform the steps of the method of modeling transformer power multiplication according to any one of claims 1-4.

7. A computer-readable storage medium having stored thereon a computer program, characterized in that The computer program product comprises a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by a computer, cause the computer to perform the steps of the method of modeling transformer power multiplication according to any one of claims 1-4.

8. A computer program product, characterised in that, The computer program product comprises a computer program stored on a non-transitory computer-readable storage medium, the computer program comprising program instructions, wherein the program instructions, when executed by a computer, cause the computer to perform the steps of the method of modeling transformer power multiplication according to any one of claims 1-4.

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