Single-phase transmission line large and small step size interface modeling method, system, device, medium and product

Abstract

The invention relates to the technical field of transient simulation modeling, and discloses a method, a system, equipment, a medium and a product for modeling a large-step size interface and a small-step size interface of a single-phase transmission line. The total line resistance of the single-phase transmission line is divided into two sections, and the transmitting end voltage and the receiving end voltage of the single-phase transmission line after being divided into the two sections are obtained; therefore, the equivalent electromagnetic equation is used for carrying out equivalent pressure, the calculation complexity is greatly reduced, the initial electromagnetic transient equation of the single-phase transmission line is updated through the sending end voltage and the receiving end voltage of the single-phase transmission line after the single-phase transmission line passes through the two segments, and the equivalent current source of the large-step interface and the equivalent current source of the small-step interface are determined. And the equivalent current source of the large-step interface and the equivalent current source of the small-step interface are updated to the electromagnetic transient equation to perform electromagnetic transient simulation modeling, so that the electromagnetic transient modeling precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of transient simulation modeling, and in particular to a large-step interface modeling method, system, equipment, medium and product for a single-phase transmission line. 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 a high switching frequency and a large amount of calculation, and requires a very small simulation step (typically 1-2us) to achieve relatively accurate simulation. However, traditional AC power grids do not require such a small simulation step, but a larger one, typically 50us. How to interact simulation data between different step sizes in the same simulation system is a difficult problem.

[0003] Currently, the electromagnetic transient modeling for interfaces with different step lengths has low accuracy and high complexity. Summary of the invention

[0004] In view of this, the present invention provides a method, system, device, medium and product for modeling large and small step interfaces of a single-phase transmission line, which solves the technical problems of low accuracy and high complexity in electromagnetic transient modeling of interfaces with different step sizes.

[0005] A first aspect of the present invention provides a large-step interface modeling method for a single-phase transmission line, comprising:

[0006] Divide the total line resistance of the single-phase transmission line into two sections, and obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after the two sections;

[0007] The initial electromagnetic transient equation of the single-phase transmission line is updated according to the sending end voltage and the receiving end voltage of the single-phase transmission line after two segments, so as to obtain an equivalent segmented electromagnetic transient equation of the single-phase transmission line;

[0008] Determine an equivalent current source of a large step-size interface and an equivalent current source of a small step-size interface in an equivalent piecewise electromagnetic transient equation of the single-phase transmission line;

[0009] The equivalent current source of the large step interface and the equivalent current source of the small step interface are updated to the equivalent piecewise electromagnetic transient equation of the single-phase transmission line, and the electromagnetic transient simulation is performed using the updated equivalent piecewise electromagnetic transient equation to construct an electromagnetic transient simulation model of the single-phase transmission line.

[0010] Preferably, dividing the total line resistance of the single-phase transmission line into two sections and obtaining the sending-end voltage and the receiving-end voltage of the single-phase transmission line after the two sections include:

[0011] The total line resistance of the single-phase transmission line is divided into two sections, and the two sections of line resistance obtained after the two sections are respectively connected in series to the sending end and the receiving end of the single-phase transmission line to form a segmented structure of the single-phase transmission line;

[0012] According to the segmented structure of the single-phase transmission line, the initial voltage at the sending end and the initial voltage at the receiving end of the single-phase transmission line are divided to obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after being divided into two segments.

[0013] Preferably, the initial electromagnetic transient equation of the single-phase transmission line includes the sending end voltage and the receiving end voltage of the single-phase transmission line;

[0014] The updating of the initial electromagnetic transient equation of the single-phase transmission line according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments to obtain the equivalent segmented electromagnetic transient equation of the single-phase transmission line includes:

[0015] The sending end voltage and the receiving end voltage of the single-phase transmission line after two-segmentation are replaced with the sending end voltage and the receiving end voltage of the initial electromagnetic transient equation of the single-phase transmission line, and the equivalent segmented electromagnetic transient equation of the single-phase transmission line is obtained by merging similar terms.

[0016] Preferably, the equivalent piecewise electromagnetic transient equation of the single-phase transmission line is:

[0017]

[0018]

[0019] In the formula, , are the branch currents at the sending and receiving ends of the single-phase transmission line, is the equivalent admittance of a single-phase transmission line, , are the voltages at the sending and receiving ends of the single-phase transmission line, , are the equivalent current sources at the sending and receiving ends of the single-phase transmission line, respectively. For the moment, is the propagation time;

[0020] in,

[0021]

[0022]

[0023]

[0024]

[0025] In the formula, , They are single-phase transmission lines in The voltage at the sending and receiving ends at the moment, is the impedance, is the total resistance, , They are single-phase transmission lines in The branch current at the sending end and the receiving end at the moment, is the inductance per unit length, is the capacitance per unit length.

[0026] Preferably, the determining of the equivalent current source of the large-step interface and the equivalent current source of the small-step interface in the equivalent piecewise electromagnetic transient equation of the single-phase transmission line comprises:

[0027] Perform linear interpolation based on the historical current sources of the two largest-step interfaces nearest to the smallest-step interface to obtain an equivalent current source of the smallest-step interface, wherein one of the sending end and the receiving end of the single-phase transmission line is the largest-step interface and the other is the smallest-step interface;

[0028] An average operation is performed according to the equivalent current source of the small step size interface and the step interval between the small step size interface and the large step size interface to obtain the equivalent current source of the large step size interface.

[0029] Preferably, the linear interpolation process is:

[0030]

[0031] In the formula, Interpolate the historical current for the small step size interface, is a small step index, is the number of steps required to run from a small step size to a large step size, is the historical current of the current large step length, is the historical current of the previous large step, The simulation step size is large.

[0032] In a second aspect, an embodiment of the present application further provides a large-step interface modeling system for a single-phase transmission line, including:

[0033] A segmentation module, used to divide the total line resistance of the single-phase transmission line into two segments, and obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments;

[0034] A transient equation updating module, used for updating the initial electromagnetic transient equation of the single-phase transmission line according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments, to obtain an equivalent segmented electromagnetic transient equation of the single-phase transmission line;

[0035] A current source equivalent module, used to determine an equivalent current source of a large step interface and an equivalent current source of a small step interface in an equivalent piecewise electromagnetic transient equation of the single-phase transmission line;

[0036] A simulation modeling module is used to update the equivalent current source of the large step interface and the equivalent current source of the small step interface into the equivalent piecewise electromagnetic transient equation of the single-phase transmission line, perform electromagnetic transient simulation using the updated equivalent piecewise electromagnetic transient equation, and construct an electromagnetic transient simulation model of the single-phase transmission line.

[0037] In a third aspect, an embodiment of the present application further provides an electronic device, comprising 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 large and small step interface modeling method of a single-phase transmission line as described in the first aspect.

[0038] In a fourth aspect, 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 large and small step interface modeling method for a single-phase transmission line as described in the first aspect are implemented.

[0039] In a fifth aspect, an embodiment of the present application 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 steps of the large and small step interface modeling method for a single-phase transmission line as described in the first aspect.

[0040] It can be seen from the above technical scheme that the present invention divides the total line resistance of the single-phase transmission line into two segments, and obtains the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments, thereby using the equivalent electromagnetic equation to perform equivalent pressure, which greatly reduces the calculation complexity, and updates the initial electromagnetic transient equation of the single-phase transmission line by the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments, and determines the equivalent current source of the large step interface and the equivalent current source of the small step interface, and uses the equivalent current source of the large step interface and the equivalent current source of the small step interface to update them to the electromagnetic transient equation to perform electromagnetic transient simulation modeling, thereby improving the accuracy of electromagnetic transient modeling. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] 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.

[0042] Figure 1 An application environment for a large-step interface modeling method for a single-phase transmission line provided by an embodiment of the present invention;

[0043] Figure 2 A flow chart of a large-step interface modeling method for a single-phase transmission line provided by an embodiment of the present invention;

[0044] Figure 3 A schematic diagram of the structure of a large-small step interface modeling system for a single-phase transmission line provided by an embodiment of the present invention;

[0045] Figure 4 A schematic diagram of the structure of an electronic device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] 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.

[0047] The large and small step interface modeling method of the single-phase transmission line provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the electromagnetic transient simulation 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 divides the total line resistance of the single-phase transmission line into two segments, and obtains the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments; according to the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments, the initial electromagnetic transient equation of the single-phase transmission line is updated to obtain the equivalent segmented electromagnetic transient equation of the single-phase transmission line; determine the equivalent current source of the large step interface and the equivalent current source of the small step interface in the equivalent segmented electromagnetic transient equation of the single-phase transmission line; update the equivalent current source of the large step interface and the equivalent current source of the small step interface to the equivalent segmented electromagnetic transient equation of the single-phase transmission line, and use the updated equivalent segmented electromagnetic transient equation to perform electromagnetic transient simulation, and construct an electromagnetic transient simulation model of the single-phase transmission line. The server 102 may be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0048] like Figure 2 As shown, the embodiment of the present application provides a large and small step interface modeling method for a single-phase transmission line, 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 S4. Among them:

[0049] Step S1, dividing the total line resistance of the single-phase transmission line into two sections, and obtaining the sending-end voltage and the receiving-end voltage of the single-phase transmission line after the two sections.

[0050] Here, the total resistance of the single-phase transmission line is considered to be R, and the total resistance R is divided into two segments, that is, the resistance of each segment is R / 2.

[0051] Specifically, in step S1, the total line resistance of the single-phase transmission line is divided into two sections, and the sending-end voltage and the receiving-end voltage of the single-phase transmission line after the two sections are obtained, including:

[0052] Step S101, dividing the total line resistance of the single-phase transmission line into two sections, and connecting the two sections of line resistance obtained after the two sections in series to the sending end and the receiving end of the single-phase transmission line respectively, to form a segmented structure of the single-phase transmission line;

[0053] Step S102: According to the segmented structure of the single-phase transmission line, the initial voltage at the sending end and the initial voltage at the receiving end of the single-phase transmission line are divided to obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after being divided into two segments.

[0054] Among them, the sending end voltage and receiving end voltage of the single-phase transmission line after two sections are:

[0055]

[0056] In the formula, , are the voltages at the sending end and receiving end of the single-phase transmission line, that is, the voltage at the sending end and the voltage at the receiving end of the single-phase transmission line after being divided into two sections. , are the initial voltage at the sending end and the initial voltage at the receiving end of the single-phase transmission line, , They are the branch currents at the sending and receiving ends of the single-phase transmission line respectively.

[0057] Step S2, updating the initial electromagnetic transient equation of the single-phase transmission line according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments, and obtaining an equivalent segmented electromagnetic transient equation of the single-phase transmission line.

[0058] Among them, the initial electromagnetic transient equation is obtained based on the electromagnetic transient calculation principle of the power system, and the initial electromagnetic transient equation is:

[0059]

[0060] In the formula, , are the branch currents at the sending and receiving ends of the single-phase transmission line, , are the voltages at the sending and receiving ends of the single-phase transmission line, , are the equivalent current sources at the sending and receiving ends of the single-phase transmission line, respectively. For the moment, is the propagation time, is the impedance, is the total resistance, , They are single-phase transmission lines in The branch current at the sending end and the receiving end at the moment, is the inductance per unit length, is the capacitance per unit length.

[0061] Among them, the initial electromagnetic transient equation of the single-phase transmission line includes the sending end voltage and the receiving end voltage of the single-phase transmission line.

[0062] In some embodiments, the initial electromagnetic transient equation of the single-phase transmission line is updated according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments in step S2 to obtain the equivalent segmented electromagnetic transient equation of the single-phase transmission line, including:

[0063] The sending-end voltage and receiving-end voltage of the single-phase transmission line after two segments are replaced with the sending-end voltage and receiving-end voltage of the initial electromagnetic transient equation of the single-phase transmission line, and the equivalent segmented electromagnetic transient equation of the single-phase transmission line is obtained by merging similar terms.

[0064] Among them, the equivalent piecewise electromagnetic transient equation of the single-phase transmission line is:

[0065]

[0066]

[0067] In the formula, , are the branch currents at the sending and receiving ends of the single-phase transmission line, is the equivalent admittance of a single-phase transmission line, , are the voltages at the sending and receiving ends of the single-phase transmission line, , are the equivalent current sources at the sending and receiving ends of the single-phase transmission line, respectively. For the moment, is the propagation time;

[0068] in,

[0069]

[0070]

[0071]

[0072]

[0073] In the formula, , They are single-phase transmission lines in The voltage at the sending and receiving ends at the moment, is the impedance, is the total resistance, , They are single-phase transmission lines in The branch current at the sending end and the receiving end at the moment, is the inductance per unit length, is the capacitance per unit length.

[0074] Step S3, determining an equivalent current source of a large-step interface and an equivalent current source of a small-step interface in an equivalent piecewise electromagnetic transient equation of a single-phase transmission line.

[0075] Among them, the sending end of the single-phase transmission line can be set as a large step length interface, and the receiving end of the single-phase transmission line can be set as a small step length interface; or the sending end of the single-phase transmission line can be set as a small step length interface, and the receiving end of the single-phase transmission line can be set as a large step length interface. When the sending end of the single-phase transmission line is a large step length interface, and the receiving end of the single-phase transmission line is set as a small step length interface, the transmission time of the large step length interface is 50us, and the transmission time of the small step length interface is 1us. When the large step length runs one step length, the small step length needs to run 50 small steps, that is, the number of steps required for the small step length to run to the large step length.

[0076] Specifically, determining the equivalent current source of the large step interface and the equivalent current source of the small step interface in the equivalent piecewise electromagnetic transient equation of the single-phase transmission line in step S3 includes:

[0077] Step S301: linearly interpolate the historical current sources of the two largest-step interfaces nearest to the smallest-step interface to obtain an equivalent current source of the smallest-step interface, wherein either the sending end or the receiving end of the single-phase transmission line is a largest-step interface and the other is a smallest-step interface.

[0078] Among them, the process of linear interpolation is:

[0079]

[0080] In the formula, Interpolate the historical current for the small step size interface, is a small step index, is the number of steps required to run from a small step size to a large step size, is the historical current of the current large step length, is the historical current of the previous large step, The simulation step size is large.

[0081] Step S302: performing an average operation according to the equivalent current source of the small step interface and the step interval between the small step interface and the large step interface to obtain the equivalent current source of the large step interface.

[0082] The calculation of the equivalent current source for the large step length is obtained by averaging the number of steps (such as 50) of historical currents required for the small step length to run to the large step length calculated from the small step length.

[0083] It can be understood that the simulation accuracy can be improved by using an average value algorithm when calculating an equivalent current source from a small step size with a large step size, and by using an interpolation algorithm when calculating an equivalent current source from a large step size with a small step size.

[0084] Step S4, updating the equivalent current source of the large step interface and the equivalent current source of the small step interface to the equivalent piecewise electromagnetic transient equation of the single-phase transmission line, performing electromagnetic transient simulation using the updated equivalent piecewise electromagnetic transient equation, and constructing an electromagnetic transient simulation model of the single-phase transmission line.

[0085] It can be understood that after obtaining the equivalent current source of the large step interface and the equivalent current source of the small step interface, they are updated to the equivalent piecewise electromagnetic transient equation of the single-phase transmission line. The updated equivalent piecewise electromagnetic transient equation can be used to perform electromagnetic transient simulation and construct an electromagnetic transient simulation model of the single-phase transmission line.

[0086] It should be noted that the embodiment of the present application divides the total line resistance of the single-phase transmission line into two segments, and obtains the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments, thereby using the equivalent electromagnetic equation to perform equivalent pressure, which greatly reduces the calculation complexity, and updates the initial electromagnetic transient equation of the single-phase transmission line by the sending end voltage and the receiving end voltage after the single-phase transmission line is divided into two segments, and determines the equivalent current source of the large step interface and the equivalent current source of the small step interface, and uses the equivalent current source of the large step interface and the equivalent current source of the small step interface to update the electromagnetic transient equation to perform electromagnetic transient simulation modeling, thereby improving the accuracy of electromagnetic transient modeling.

[0087] Based on the same inventive concept, an embodiment of the present application also provides a large and small step interface modeling system for a single-phase transmission line for implementing the large and small step interface modeling method for a single-phase transmission line involved above.

[0088] The implementation solution to the problem provided by the system is similar to the implementation solution recorded in the above method. Therefore, the specific limitations in the embodiments of the large and small step interface modeling system for one or more single-phase transmission lines provided below can be found in the above limitations on the large and small step interface modeling method for single-phase transmission lines, and will not be repeated here.

[0089] like Figure 3 As shown, the embodiment of the present application also provides a large and small step interface modeling system for a single-phase transmission line, including:

[0090] The segmentation module 100 is used to divide the total line resistance of the single-phase transmission line into two segments, and obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments;

[0091] The transient equation updating module 200 is used to update the initial electromagnetic transient equation of the single-phase transmission line according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments, so as to obtain an equivalent segmented electromagnetic transient equation of the single-phase transmission line;

[0092] The current source equivalent module 300 is used to determine the equivalent current source of the large step interface and the equivalent current source of the small step interface in the equivalent segmented electromagnetic transient equation of the single-phase transmission line;

[0093] The simulation modeling module 400 is used to update the equivalent current source of the large step interface and the equivalent current source of the small step interface to the equivalent piecewise electromagnetic transient equation of the single-phase transmission line, use the updated equivalent piecewise electromagnetic transient equation to perform electromagnetic transient simulation, and construct an electromagnetic transient simulation model of the single-phase transmission line.

[0094] In some embodiments, the segmentation module 100 is used to divide the total line resistance of the single-phase transmission line into two segments, and the two line resistances obtained after the two segments are respectively connected in series to the sending end and the receiving end of the single-phase transmission line to form a segmented structure of the single-phase transmission line; according to the segmented structure of the single-phase transmission line, the initial voltage of the sending end and the initial voltage of the receiving end of the single-phase transmission line are divided to obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after two segments.

[0095] In some embodiments, the initial electromagnetic transient equation of the single-phase transmission line includes a sending-end voltage and a receiving-end voltage of the single-phase transmission line.

[0096] The transient equation updating module 200 is used to replace the sending end voltage and the receiving end voltage of the single-phase transmission line after two segments with the sending end voltage and the receiving end voltage of the initial electromagnetic transient equation of the single-phase transmission line, and obtain the equivalent segmented electromagnetic transient equation of the single-phase transmission line by merging similar terms.

[0097] In some embodiments, the equivalent piecewise electromagnetic transient equation of a single-phase transmission line is:

[0098]

[0099]

[0100] In the formula, , are the branch currents at the sending and receiving ends of the single-phase transmission line, is the equivalent admittance of a single-phase transmission line, , are the voltages at the sending and receiving ends of the single-phase transmission line, , are the equivalent current sources at the sending and receiving ends of the single-phase transmission line, respectively. For the moment, is the propagation time;

[0101] in,

[0102]

[0103]

[0104]

[0105]

[0106] In the formula, , They are single-phase transmission lines in The voltage at the sending and receiving ends at the moment, is the impedance, is the total resistance, , They are single-phase transmission lines in The branch current at the sending end and the receiving end at the moment, is the inductance per unit length, is the capacitance per unit length.

[0107] In some embodiments, the current source equivalent module 300 is used to perform linear interpolation based on the historical current sources of the two largest-step interfaces nearest to the smallest-step interface to obtain an equivalent current source of the smallest-step interface, wherein one of the sending end and the receiving end of the single-phase transmission line is a largest-step interface and the other is a smallest-step interface;

[0108] The equivalent current source of the large step size interface is obtained by performing an average operation according to the equivalent current source of the small step size interface and the step interval between the small step size interface and the large step size interface.

[0109] In some embodiments, the process of linear interpolation is:

[0110]

[0111] In the formula, Interpolate the historical current for the small step size interface, is a small step index, is the number of steps required to run from a small step size to a large step size, is the historical current of the current large step length, is the historical current of the previous large step, Simulate step size for large step size

[0112] like Figure 4 As shown, an embodiment of the present application also provides an electronic device, the electronic device 10 includes a memory 20 and a processor 30, the memory 20 stores a computer program, and when the computer program is executed by the processor 30, the processor 30 executes the steps of the large and small step interface modeling method of the single-phase transmission line in any of the above embodiments.

[0113] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed, the steps of the large-step interface modeling method for a single-phase transmission line in any of the above embodiments are implemented.

[0114] 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 large and small step interface modeling method for a single-phase transmission line in any of the above embodiments.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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 is essentially 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 and other media that can store program codes.

[0122] 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 large-step interface modeling method for a single-phase transmission line, characterized in that: include: Divide the total line resistance of the single-phase transmission line into two sections, and obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after the two sections; The initial electromagnetic transient equation of the single-phase transmission line is updated according to the sending end voltage and the receiving end voltage of the single-phase transmission line after two segments, so as to obtain an equivalent segmented electromagnetic transient equation of the single-phase transmission line; Determine an equivalent current source of a large step-size interface and an equivalent current source of a small step-size interface in an equivalent piecewise electromagnetic transient equation of the single-phase transmission line; The equivalent current source of the large step interface and the equivalent current source of the small step interface are updated to the equivalent piecewise electromagnetic transient equation of the single-phase transmission line, and the electromagnetic transient simulation is performed using the updated equivalent piecewise electromagnetic transient equation to construct an electromagnetic transient simulation model of the single-phase transmission line.

2. The large-step interface modeling method for a single-phase transmission line according to claim 1, characterized in that: The method of dividing the total line resistance of the single-phase transmission line into two sections and obtaining the sending-end voltage and the receiving-end voltage of the single-phase transmission line after the two sections are obtained includes: The total line resistance of the single-phase transmission line is divided into two sections, and the two sections of line resistance obtained after the two sections are respectively connected in series to the sending end and the receiving end of the single-phase transmission line to form a segmented structure of the single-phase transmission line; According to the segmented structure of the single-phase transmission line, the initial voltage at the sending end and the initial voltage at the receiving end of the single-phase transmission line are divided to obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after being divided into two segments.

3. The large-step interface modeling method for a single-phase transmission line according to claim 1, characterized in that: The initial electromagnetic transient equation of the single-phase transmission line includes the sending end voltage and the receiving end voltage of the single-phase transmission line; The updating of the initial electromagnetic transient equation of the single-phase transmission line according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments to obtain the equivalent segmented electromagnetic transient equation of the single-phase transmission line includes: The sending end voltage and the receiving end voltage of the single-phase transmission line after two-segmentation are replaced with the sending end voltage and the receiving end voltage of the initial electromagnetic transient equation of the single-phase transmission line, and the equivalent segmented electromagnetic transient equation of the single-phase transmission line is obtained by merging similar terms.

4. The large-step interface modeling method for a single-phase transmission line according to claim 1, characterized in that: The equivalent piecewise electromagnetic transient equation of the single-phase transmission line is: In the formula, , are the branch currents at the sending and receiving ends of the single-phase transmission line, is the equivalent admittance of a single-phase transmission line, , are the voltages at the sending and receiving ends of the single-phase transmission line, , are the equivalent current sources at the sending and receiving ends of the single-phase transmission line, respectively. For the moment, is the propagation time; in, In the formula, , They are single-phase transmission lines in The voltage at the sending and receiving ends at the moment, is the impedance, is the total resistance, , They are single-phase transmission lines in The branch current at the sending end and the receiving end at the moment, is the inductance per unit length, is the capacitance per unit length.

5. The large-step interface modeling method for a single-phase transmission line according to claim 1 or 4, characterized in that: The step of determining the equivalent current source of the large-step interface and the equivalent current source of the small-step interface in the equivalent piecewise electromagnetic transient equation of the single-phase transmission line comprises: Perform linear interpolation based on the historical current sources of the two largest-step interfaces nearest to the smallest-step interface to obtain an equivalent current source of the smallest-step interface, wherein one of the sending end and the receiving end of the single-phase transmission line is the largest-step interface and the other is the smallest-step interface; An average operation is performed according to the equivalent current source of the small step size interface and the step interval between the small step size interface and the large step size interface to obtain the equivalent current source of the large step size interface.

6. The large-step interface modeling method for a single-phase transmission line according to claim 5, characterized in that: The linear interpolation process is: In the formula, Interpolate the historical current for the small step size interface, is a small step index, is the number of steps required to run from a small step size to a large step size, is the historical current of the current large step length, is the historical current of the previous large step, The simulation step size is large.

7. A large-step interface modeling system for a single-phase transmission line, characterized in that: include: A segmentation module, used to divide the total line resistance of the single-phase transmission line into two segments, and obtain the sending end voltage and the receiving end voltage of the single-phase transmission line after the two segments; A transient equation updating module, used for updating the initial electromagnetic transient equation of the single-phase transmission line according to the sending-end voltage and the receiving-end voltage of the single-phase transmission line after two segments, to obtain an equivalent segmented electromagnetic transient equation of the single-phase transmission line; A current source equivalent module, used to determine an equivalent current source of a large step interface and an equivalent current source of a small step interface in an equivalent piecewise electromagnetic transient equation of the single-phase transmission line; A simulation modeling module is used to update the equivalent current source of the large step interface and the equivalent current source of the small step interface into the equivalent piecewise electromagnetic transient equation of the single-phase transmission line, perform electromagnetic transient simulation using the updated equivalent piecewise electromagnetic transient equation, and construct an electromagnetic transient simulation model of the single-phase transmission line.

8. An electronic device, characterized in that: The electronic device includes 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 large-step interface modeling method for a single-phase transmission line as described in any one of claims 1-6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed, the steps of the large-step interface modeling method for a single-phase transmission line as described in any one of claims 1 to 6 are 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 steps of the large-step interface modeling method for a single-phase transmission line as described in any one of claims 1 to 6.

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