Transformer high-frequency current attenuation degree simulation method and device

Abstract

The embodiment of the invention discloses a transformer high-frequency current attenuation degree simulation method and device. The method comprises the steps that a converter transformer high-frequency current attenuation degree simulation model is established according to a preset converter transformer high-frequency current capacitive high-frequency equivalent loop; carrying out multiple times of fault simulation, setting a fault source at one target position in a plurality of preset target positions in the high-frequency current attenuation degree simulation model of the converter transformer during each time of fault simulation, and then carrying out simulation to obtain high-frequency current signal waveforms of all grounding points; and determining the high-frequency current signal attenuation degree of each grounding point to each target position according to the high-frequency current signal waveform of each grounding point when the fault source is arranged at each target position. The attenuation degree of the high-frequency current of different grounding points is obtained through simulation research, and the defect that research on the attenuation degree of the high-frequency current is lacked in existing research is overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment state detection and protection, and in particular to a method and device for simulating the attenuation degree of high-frequency current of a transformer. Background Art

[0002] The converter transformer is a vital device in the new energy power grid, and its stable operation is related to the power supply quality and economic benefits of the power system. Partial discharge inside the converter transformer winding is one of the main forms of converter transformer failure. During partial discharge, a high-frequency current signal is generated inside the converter transformer, which can be measured by a high-frequency current sensor at different grounding positions of the converter transformer to judge the operating status of the converter transformer. By simulating the high-frequency current transfer process in the converter transformer, the high-frequency current attenuation degree at different grounding points can be obtained, providing an optimization method for online monitoring and protection of the converter transformer.

[0003] Existing research lacks simulation research on the high-frequency current transfer process of converter transformers, and lacks relevant research on the degree of high-frequency current attenuation at different grounding positions. It is impossible to reversely infer the size of the fault source from the measured signal quantity, and related problems need to be solved urgently. Summary of the invention

[0004] In order to solve at least one technical problem in the above-mentioned background technology, the present invention proposes a method and device for simulating the attenuation degree of high-frequency current of a transformer.

[0005] In order to achieve the above object, according to one aspect of the present invention, a method for simulating the attenuation degree of high-frequency current of a transformer is provided, the method comprising:

[0006] A converter transformer high-frequency current attenuation degree simulation model is established according to a preset converter transformer high-frequency current capacitive high-frequency equivalent circuit;

[0007] Perform multiple fault simulations, set a fault source at one of multiple target positions preset in the converter transformer high-frequency current attenuation degree simulation model in each fault simulation, and then perform simulation to obtain a high-frequency current signal waveform of each grounding point;

[0008] According to the high-frequency current signal waveform of each grounding point when a fault source is set at each target position, the attenuation degree of the high-frequency current signal of each grounding point with respect to each target position is determined.

[0009] Optionally, the transformer high-frequency current attenuation degree simulation method further includes:

[0010] By carrying out a real transformer partial discharge test, the high-frequency current signal waveform under real discharge conditions is measured, and the measured high-frequency current signal waveform is set as the high-frequency current signal waveform of the fault source.

[0011] Optionally, the step of determining the attenuation degree of the high-frequency current signal of each grounding point for each target position according to the high-frequency current signal waveform of each grounding point when the fault source is set at each target position includes:

[0012] The ratio between the first wave peak value of the high-frequency current at the grounding point and the first wave peak value of the high-frequency current at the fault source is determined as the attenuation degree of the high-frequency current signal of the grounding point with respect to the target position.

[0013] Optionally, setting a fault source at one of a plurality of target positions preset in the converter transformer high-frequency current attenuation degree simulation model includes:

[0014] When setting the fault source, the capacitor at the selected target position is short-circuited, and the capacitor is regarded as having broken down at the equivalent actual position in the real converter transformer, and then the fault source signal is connected to the target position.

[0015] Optionally, the high-frequency current capacitor high-frequency equivalent circuit of the converter transformer includes: a voltage regulating-core inductive capacitor, a voltage regulating winding turn-to-turn capacitor, a grid-side-voltage regulating inductive capacitor, a grid-side winding capacitor network, a valve side-grid-side inductive capacitor, a valve side winding turn-to-turn capacitor, and a valve side-shell inductive capacitor.

[0016] Optionally, the multiple target positions are respectively set at the inter-turn capacitance of the voltage regulating winding, the grid-side winding capacitance network, and the inter-turn capacitance of the valve-side winding.

[0017] Optionally, the grounding points include: an iron core grounding point, a bushing end screen grounding point, an oil tank grounding point and a neutral point grounding point.

[0018] In order to achieve the above object, according to another aspect of the present invention, a transformer high-frequency current attenuation degree simulation device is provided, the device comprising:

[0019] A simulation model establishment unit, used to establish a converter transformer high-frequency current attenuation degree simulation model according to a preset converter transformer high-frequency current capacitive high-frequency equivalent circuit;

[0020] A fault simulation unit is used to perform multiple fault simulations. In each fault simulation, a fault source is set at one of multiple target positions preset in the converter transformer high-frequency current attenuation degree simulation model, and then a simulation is performed to obtain a high-frequency current signal waveform of each grounding point;

[0021] The high-frequency current signal attenuation degree determining unit is used to determine the high-frequency current signal attenuation degree of each grounding point for each target position according to the high-frequency current signal waveform of each grounding point when a fault source is set at each target position.

[0022] Optionally, the transformer high-frequency current attenuation degree simulation device further includes:

[0023] The fault source setting unit is used to measure the high-frequency current signal waveform under real discharge conditions by conducting a real transformer partial discharge test, and set the measured high-frequency current signal waveform as the high-frequency current signal waveform of the fault source.

[0024] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned method for simulating the attenuation degree of high-frequency current of the transformer when executing the computer program.

[0025] In order to achieve the above-mentioned purpose, according to another aspect of the present invention, a computer-readable storage medium is further provided, on which a computer program / instruction is stored, and when the computer program / instruction is executed by a processor, the steps of the above-mentioned transformer high-frequency current attenuation degree simulation method are implemented.

[0026] The beneficial effects of the present invention are:

[0027] The embodiment of the present invention builds a simulation model for the attenuation degree of high-frequency current of a transformer, and obtains the attenuation degree of high-frequency current at different grounding points through simulation research, which makes up for the lack of research on the attenuation degree of high-frequency current in existing research. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0029] Figure 1 is a flow chart of a method for simulating the attenuation degree of high-frequency current of a transformer according to an embodiment of the present invention;

[0030] Figure 2 Schematic diagram of a high-frequency current capacitor high-frequency equivalent circuit of a converter transformer according to an embodiment of the present invention;

[0031] Figure 3 This is a first structural block diagram of a transformer high-frequency current attenuation degree simulation device according to an embodiment of the present invention;

[0032] Figure 4 This is a second structural block diagram of the transformer high-frequency current attenuation degree simulation device according to an embodiment of the present invention;

[0033] Figure 5It is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] 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 should fall within the scope of protection of the present invention.

[0035] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0036] 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.

[0037] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0038] The present invention proposes a method for studying the attenuation degree of high-frequency current of a transformer. The method takes the actual fault signal as the signal source and obtains the attenuation degree of high-frequency current at different grounding points through simulation research. This method makes up for the lack of research on the attenuation degree of high-frequency current in existing research and provides technical support for inferring the high-frequency size of the current at the fault point through the high-frequency current of the grounding point.

[0039] The transformer high-frequency current attenuation degree research method of the present invention comprises three parts: a fault source signal setting method, a simulation model building method and a high-frequency current attenuation degree calculation method.

[0040] Figure 1 Flowchart of the method for simulating the attenuation degree of high-frequency current of a transformer according to an embodiment of the present invention. Figure 1As shown, in one embodiment of the present invention, the transformer high-frequency current attenuation degree simulation method of the present invention includes steps S101 to S103.

[0041] Step S101, establishing a converter transformer high-frequency current attenuation degree simulation model according to a preset converter transformer high-frequency current capacitive high-frequency equivalent circuit.

[0042] Existing studies generally regard the transformer winding as a whole or divide it into several winding units, ignoring the complex winding structure inside the transformer. The present invention proposes a simulation model construction method, combining the internal electrical parameters and electrical structure of the real transformer to build a simulation model of the high-frequency current attenuation degree of the converter transformer, which is more consistent with the high-frequency current transmission process in actual situations and has more accurate simulation results.

[0043] Step S102, performing multiple fault simulations, setting a fault source at one of multiple target positions preset in the converter transformer high-frequency current attenuation degree simulation model in each fault simulation, and then performing simulation to obtain the high-frequency current signal waveform of each grounding point.

[0044] In one embodiment of the present invention, the grounding points include: an iron core grounding point, a bushing end screen grounding point, an oil tank grounding point and a neutral point grounding point.

[0045] In one embodiment of the present invention, a plurality of target positions are preset, and a fault source is set at one of the target positions each time a fault simulation is performed until all the target positions are subjected to fault simulation.

[0046] Step S103 , determining the attenuation degree of the high-frequency current signal of each grounding point with respect to each target position according to the high-frequency current signal waveform of each grounding point when the fault source is set at each target position.

[0047] It can be seen that the present invention builds a simulation model for the attenuation degree of high-frequency current of the transformer, and obtains the attenuation degree of high-frequency current at different grounding points through simulation research, which makes up for the lack of attenuation degree of high-frequency current in existing research.

[0048] In one embodiment of the present invention, the present invention is equivalent to a real partial discharge high-frequency signal in parameter setting. In order to synchronize the actual simulated winding head end fault, the input of the simulated fault source is set at the winding head end position in the equivalent capacitor network.

[0049] In one embodiment of the present invention, the transformer high-frequency current attenuation degree simulation method of the present invention further includes:

[0050] By carrying out a real transformer partial discharge test, the high-frequency current signal waveform under real discharge conditions is measured, and the measured high-frequency current signal waveform is set as the high-frequency current signal waveform of the fault source.

[0051] The existing fault source high-frequency current signals are mostly Gaussian pulses or sinusoidal decay signals, which are inconsistent with the actual high-frequency current signals. The present invention proposes a fault source signal setting method, which measures the high-frequency signal waveform under real discharge conditions by conducting a real transformer partial discharge test, and applies the signal to the simulation, which greatly improves the problem that the existing signal is inconsistent with the actual high-frequency current signal.

[0052] In a specific embodiment of the present invention, the present invention conducts a ±800kV real converter transformer partial discharge test, measures the high-frequency signal waveform under actual discharge conditions, obtains a ±800kV converter transformer partial discharge high-frequency current signal waveform, and sets the measured high-frequency current signal waveform as the fault source high-frequency current signal waveform.

[0053] In one embodiment of the present invention, the above step S103 determines the attenuation degree of the high-frequency current signal of each grounding point for each target position according to the high-frequency current signal waveform of each grounding point when the fault source is set at each target position, including:

[0054] The ratio between the first wave peak value of the high-frequency current at the grounding point and the first wave peak value of the high-frequency current at the fault source is determined as the attenuation degree of the high-frequency current signal of the grounding point with respect to the target position.

[0055] In one embodiment of the present invention, the step S102 of setting a fault source at one of a plurality of target positions preset in the converter transformer high-frequency current attenuation degree simulation model comprises:

[0056] When setting the fault source, the capacitor at the selected target position is short-circuited, and the capacitor is regarded as having broken down at the equivalent actual position in the real converter transformer, and then the fault source signal is connected to the target position.

[0057] The target position of the fault source set by the present invention can be any position in the capacitor network of the winding part to simulate the turn-to-turn breakdown and the inter-cake breakdown at any position. When the high-frequency current fault signal is connected, the capacitor at the access point (i.e., the target position) is first short-circuited, and the actual position equivalent to the capacitor in the real converter transformer is regarded as having a breakdown, and then the fault source signal is connected to the short-circuited position to generate a fault source in the winding network. Due to the structural characteristics of the winding, the continuous winding can simulate the inter-cake and inter-turn breakdown, and the spiral winding can only simulate the longitudinal inter-cake breakdown. That is, when the target position is in the continuous winding, the capacitor at the target position is short-circuited, and the actual position equivalent to the capacitor in the real converter transformer is regarded as having a inter-cake breakdown and an inter-turn breakdown. When the target position is in the spiral winding, the capacitor at the target position is short-circuited, and the actual position equivalent to the capacitor in the real converter transformer is regarded as having a inter-cake breakdown.

[0058] In one embodiment of the present invention, the present invention obtains simulation data at each grounding line current measurement point (core grounding, shell grounding, bushing grounding, neutral point grounding) as follows Figure 2 As shown in B, a grounding current measurement unit is set at each grounding point, and a data processing unit is used to summarize the measured first wave peak values ​​of different grounding current signals and the first wave peak values ​​of the fault input signal to obtain the high-frequency signal attenuation degree information.

[0059] The present invention proposes a method for calculating the attenuation degree of high-frequency current. The ratio of the first wave peak value of the high-frequency current at the grounding point to the first wave peak value of the high-frequency current at the fault source is recorded as the attenuation degree of the high-frequency current of the grounding point at the target position, which can provide a theoretical basis for inferring the size of the fault source based on the known monitoring point signal.

[0060] In one embodiment of the present invention, after determining the attenuation degree of the high-frequency current signal of each grounding point for each target position, the present invention can reversely infer the size of the fault source based on the collected high-frequency current signals of each grounding point and the attenuation degree information of the high-frequency current signal in actual application, thereby providing a theoretical basis for fault inference.

[0061] Figure 2 Schematic diagram of a high-frequency current capacitor high-frequency equivalent circuit of a converter transformer according to an embodiment of the present invention. Figure 2 As shown, in one embodiment of the present invention, the high-frequency current capacitor high-frequency equivalent circuit of the converter transformer includes: a voltage regulating-core inductive capacitor, a voltage regulating winding inter-turn capacitor, a grid-side-voltage regulating inductive capacitor, a grid-side winding capacitor network, a valve-side-grid-side inductive capacitor, a valve-side winding inter-turn capacitor, and a valve-side-shell inductive capacitor.

[0062] The equivalent circuit model of the present invention takes into account the internal structure of the converter transformer winding, and restores the inter-turn and inter-disk capacitance of each coil of the winding when partial discharge occurs through an equivalent capacitive structure, which greatly improves the freedom of setting the fault source and can theoretically simulate partial discharge high-frequency current at any position inside the winding.

[0063] In one embodiment of the present invention, an equivalent model is established based on the winding parameters of a real ±800kV converter transformer. Figure 2 As shown, the present invention starts from the converter transformer core, and the voltage regulating, grid side, and valve side windings are arranged outward in sequence. The voltage regulating and valve side windings are spiral, and only the longitudinal inter-pancake capacitance is considered. 100 turns of the voltage regulating winding correspond to 99 inter-pancake capacitances; 189 turns of the valve side winding correspond to 188 inter-pancake capacitances. The grid side winding is a continuous structure, with 4 turns of winding in one pancake, so the grid side winding capacitor network includes inter-turn capacitance and inter-pancake capacitance.

[0064] like Figure 2 As shown, in one embodiment of the present invention, the target position is represented by An, and the multiple target positions An are respectively set at the voltage regulating winding inter-turn capacitance, the grid-side winding capacitance network, and the valve-side winding inter-turn capacitance.

[0065] like Figure 2 As shown, in one embodiment of the present invention, the grounding point is represented by B, and the grounding points include: a core grounding point, a winding grounding point, a bushing grounding point and a casing grounding point.

[0066] Fault source applied position Figure 2 As shown in the points An in the figure, during simulation, the fault source can be connected to any point between the winding units to simulate the turn-to-turn breakdown at different positions. Figure 2 As shown, measurement units are respectively set at different grounding points, and the measured different grounding current signals are compared with the fault input signal to obtain the attenuation degree information of the high-frequency current signal.

[0067] like Figure 2 As shown, the present invention adds the fault source signal at any position An inside the winding, obtains the high-frequency current signal waveforms at different grounding points through simulation, and records the ratio of the first wave peak value of the high-frequency current at the grounding point B to the first wave peak value of the high-frequency current at the fault source as the attenuation degree of the high-frequency current at the grounding point B at the fault position An. The fault source position is modified, and the above operation is repeated to obtain the attenuation degree of the high-frequency current signal of each monitoring point at different positions in the transformer winding.

[0068] It can be seen that the present invention proposes a method for studying the attenuation degree of high-frequency current of converter transformers through simulation, accurately restores the fault condition of converter power transformers, and is completely equivalent to the internal winding structure of actual transformers, making the simulation results more accurate. The present invention uses the high-frequency current signal waveform measured by the partial discharge test of the real converter transformer as the simulated fault source, combines the internal electrical parameters and electrical structure of the real transformer, builds a simulation model of the attenuation degree of high-frequency current of converter transformers, and obtains the attenuation degree of high-frequency current signals at each monitoring point at different positions in the transformer winding.

[0069] It can be seen from the above embodiments that the transformer high-frequency current attenuation degree simulation method of the present invention achieves at least the following beneficial effects:

[0070] The present invention proposes a method for simulating the high-frequency current generation and transmission process of a converter transformer. The signal waveform measured in a real transformer test is used as the simulation signal source waveform. In combination with the actual electrical parameters inside the transformer, a simulation model of the transformer's high-frequency current attenuation degree is constructed, thereby ensuring the dual accuracy of the discharge signal source and the model's electrical parameters. The attenuation degree of the high-frequency current at different grounding points is obtained through simulation research, which makes up for the lack of research on the attenuation degree of high-frequency current in existing research.

[0071] It should be noted that the steps shown in the flowcharts of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and that, although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0072] Based on the same inventive concept, an embodiment of the present invention also provides a transformer high-frequency current attenuation degree simulation device, which can be used to implement the transformer high-frequency current attenuation degree simulation method described in the above embodiment, as described in the following embodiment. Since the principle of solving the problem by the transformer high-frequency current attenuation degree simulation device is similar to that of the transformer high-frequency current attenuation degree simulation method, the embodiment of the transformer high-frequency current attenuation degree simulation device can refer to the embodiment of the transformer high-frequency current attenuation degree simulation method, and the repeated parts will not be repeated. As used below, the term "unit" or "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0073] Figure 3 is a first structural block diagram of the transformer high-frequency current attenuation degree simulation device according to an embodiment of the present invention, such as Figure 3 As shown, in one embodiment of the present invention, the transformer high-frequency current attenuation degree simulation device of the present invention includes:

[0074] A simulation model establishment unit 1 is used to establish a converter transformer high-frequency current attenuation degree simulation model according to a preset converter transformer high-frequency current capacitive high-frequency equivalent circuit;

[0075] A fault simulation unit 2 is used to perform multiple fault simulations. In each fault simulation, a fault source is set at one of multiple target positions preset in the converter transformer high-frequency current attenuation degree simulation model, and then a simulation is performed to obtain a high-frequency current signal waveform of each grounding point;

[0076] The high-frequency current signal attenuation degree determining unit 3 is used to determine the high-frequency current signal attenuation degree of each grounding point for each target position according to the high-frequency current signal waveform of each grounding point when a fault source is set at each target position.

[0077] Figure 4 is a second structural block diagram of the transformer high-frequency current attenuation degree simulation device according to an embodiment of the present invention, such as Figure 4 As shown, in one embodiment of the present invention, the transformer high-frequency current attenuation degree simulation device of the present invention includes: a fault source setting unit 4, and the fault source setting unit 4 is connected to the fault simulation unit 2.

[0078] The fault source setting unit 4 is used to measure the high-frequency current signal waveform under real discharge conditions by conducting a real transformer partial discharge test, and set the measured high-frequency current signal waveform as the high-frequency current signal waveform of the fault source.

[0079] In one embodiment of the present invention, the high-frequency current signal attenuation degree determining unit 3 includes:

[0080] The calculation processing module is used to determine the ratio between the first wave peak value of the high-frequency current at the grounding point and the first wave peak value of the high-frequency current at the fault source as the attenuation degree of the high-frequency current signal of the grounding point with respect to the target position.

[0081] In one embodiment of the present invention, the fault simulation unit 2 includes:

[0082] The capacitor short-circuit processing module is used to short-circuit the capacitor at the selected target position when setting the fault source, treating the capacitor as having broken down at the equivalent actual position in the real converter transformer, and then connecting the fault source signal to the target position.

[0083] In one embodiment of the present invention, the high-frequency current capacitor high-frequency equivalent circuit of the converter transformer includes: a voltage regulating-core inductive capacitor, a voltage regulating winding turn-to-turn capacitor, a grid-side-voltage regulating inductive capacitor, a grid-side winding capacitor network, a valve-side-grid-side inductive capacitor, a valve-side winding turn-to-turn capacitor, and a valve-side-shell inductive capacitor.

[0084] In one embodiment of the present invention, the multiple target positions are respectively set at the voltage regulating winding inter-turn capacitance, the grid-side winding capacitance network and the valve-side winding inter-turn capacitance.

[0085] In one embodiment of the present invention, the grounding points include: an iron core grounding point, a bushing end screen grounding point, an oil tank grounding point and a neutral point grounding point.

[0086] In order to achieve the above object, according to another aspect of the present application, a computer device is also provided. Figure 5 As shown, the computer device includes a memory, a processor, a communication interface and a communication bus. A computer program that can be executed on the processor is stored in the memory. When the processor executes the computer program, the steps in the above-mentioned embodiment method are implemented.

[0087] The processor may be a central processing unit (CPU). The processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or a combination of the above chips.

[0088] The memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer executable programs and units, such as the corresponding program units in the above method embodiments of the present invention. The processor executes various functional applications of the processor and works data processing by running the non-transitory software programs, instructions and modules stored in the memory, that is, implementing the method in the above method embodiments.

[0089] The memory may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created by the processor, etc. In addition, the memory may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory may optionally include a memory remotely arranged relative to the processor, and these remote memories may be connected to the processor via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0090] The one or more units are stored in the memory, and when executed by the processor, the method in the above embodiment is performed.

[0091] The specific details of the above-mentioned computer device can be understood by referring to the corresponding related descriptions and effects in the above-mentioned embodiments, and will not be repeated here.

[0092] In order to achieve the above purpose, according to another aspect of the present application, a computer-readable storage medium is also provided, wherein the computer-readable storage medium stores a computer program, and the computer program implements the steps in the above transformer high-frequency current attenuation degree simulation method when executed in a computer processor. Those skilled in the art can understand that the implementation of all or part of the process in the above embodiment method can be completed by instructing the relevant hardware through a computer program, and the program can be stored in a computer-readable storage medium, and the program can include the process of the embodiment of each method as described above when executed. Among them, the storage medium can be a disk, an optical disk, a read-only memory (ROM), a random access memory (RAM), a flash memory (Flash Memory), a hard disk (Hard Disk Drive, abbreviated: HDD) or a solid-state drive (SSD), etc.; the storage medium can also include a combination of the above types of memory.

[0093] In order to achieve the above-mentioned purpose, according to another aspect of the present application, a computer program product is further provided, including a computer program / instruction, which, when executed by a processor, implements the steps of the above-mentioned transformer high-frequency current attenuation degree simulation method.

[0094] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for simulating the attenuation degree of high-frequency current of a transformer, characterized in that: include: A converter transformer high-frequency current attenuation degree simulation model is established according to a preset converter transformer high-frequency current capacitive high-frequency equivalent circuit; Perform multiple fault simulations, set a fault source at one of multiple target positions preset in the converter transformer high-frequency current attenuation degree simulation model in each fault simulation, and then perform simulation to obtain a high-frequency current signal waveform of each grounding point; According to the high-frequency current signal waveform of each grounding point when a fault source is set at each target position, the attenuation degree of the high-frequency current signal of each grounding point with respect to each target position is determined.

2. The transformer high-frequency current attenuation degree simulation method according to claim 1 is characterized in that: Also includes: By carrying out a real transformer partial discharge test, the high-frequency current signal waveform under real discharge conditions is measured, and the measured high-frequency current signal waveform is set as the high-frequency current signal waveform of the fault source.

3. The transformer high-frequency current attenuation degree simulation method according to claim 1 is characterized in that: The method of determining the attenuation degree of the high-frequency current signal of each grounding point for each target position according to the high-frequency current signal waveform of each grounding point when the fault source is set at each target position includes: The ratio between the first wave peak value of the high-frequency current at the grounding point and the first wave peak value of the high-frequency current at the fault source is determined as the attenuation degree of the high-frequency current signal of the grounding point with respect to the target position.

4. The transformer high-frequency current attenuation degree simulation method according to claim 1 is characterized in that: The step of setting a fault source at one of a plurality of target positions preset in the converter transformer high-frequency current attenuation degree simulation model comprises: When setting the fault source, the capacitor at the selected target position is short-circuited, and the capacitor is regarded as having broken down at the equivalent actual position in the real converter transformer, and then the fault source signal is connected to the target position.

5. The transformer high-frequency current attenuation degree simulation method according to claim 1, characterized in that: The high-frequency current capacitor high-frequency equivalent circuit of the converter transformer includes: a voltage regulating-iron core inductive capacitor, a voltage regulating winding inter-turn capacitor, a grid-side-voltage regulating inductive capacitor, a grid-side winding capacitor network, a valve-side-grid-side inductive capacitor, a valve-side winding inter-turn capacitor and a valve-side-shell inductive capacitor.

6. The transformer high-frequency current attenuation degree simulation method according to claim 5, characterized in that: The multiple target positions are respectively set at the voltage regulating winding inter-turn capacitance, the grid-side winding capacitance network and the valve-side winding inter-turn capacitance.

7. The transformer high-frequency current attenuation degree simulation method according to claim 1, characterized in that: The grounding points include: an iron core grounding point, a bushing end screen grounding point, an oil tank grounding point and a neutral point grounding point.

8. A transformer high-frequency current attenuation degree simulation device, characterized in that: include: A simulation model establishment unit, used to establish a converter transformer high-frequency current attenuation degree simulation model according to a preset converter transformer high-frequency current capacitive high-frequency equivalent circuit; A fault simulation unit is used to perform multiple fault simulations. In each fault simulation, a fault source is set at one of multiple target positions preset in the converter transformer high-frequency current attenuation degree simulation model, and then a simulation is performed to obtain a high-frequency current signal waveform of each grounding point; The high-frequency current signal attenuation degree determining unit is used to determine the high-frequency current signal attenuation degree of each grounding point for each target position according to the high-frequency current signal waveform of each grounding point when a fault source is set at each target position.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program / instruction stored thereon, characterized in that: When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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