Method, device and equipment for evaluating partial discharge propagation of generator stator winding ground loop and medium

Abstract

The application discloses a kind of generator stator winding ground loop partial discharge propagation evaluation method, device, equipment and medium, wherein the method comprises: obtaining the frequency response characteristic data of electrical primary equipment in stator winding ground loop;Further construct the first simulation model of stator winding ground loop;Obtain the propagation decay characteristic data of partial discharge pulse current signal in stator winding ground loop, optimize first simulation model to obtain second simulation model;Quantitative evaluation model is constructed based on quantitative evaluation parameter;The pulse data output by second simulation model is input into quantitative evaluation model, and the evaluation index of partial discharge signal propagation is obtained;Evaluation index represents the influence of stator winding ground loop on partial discharge propagation.The application can simulate stator winding ground loop by second simulation model and quantitative evaluation model, and then evaluate the insulation state of unit by quantitative evaluation model, to improve the reliability and effectiveness of unit insulation state evaluation.

Description

Technical Field

[0001] This application relates to the field of power equipment monitoring technology, and in particular to a method, device, equipment and medium for assessing the propagation of partial discharge in a generator stator winding grounding circuit. Background Technology

[0002] Large hydro-generators are subjected to a combination of thermal, electrical, mechanical, and environmental stresses during operation, which gradually degrades the insulation performance of the stator windings.

[0003] In related technologies, for example, online partial discharge monitoring can effectively assess the insulation status of stator windings. This is achieved by coupling partial discharge pulse current signals from the neutral point using coupling capacitors or Rogowski coils. However, when the partial discharge pulse current signal propagates from the discharge source to the neutral point sensor, the propagation path includes not only the stator windings but also the grounding loop connecting the stator winding neutral point to the ground. The grounding loop typically uses cables or grounding busbars, and large hydroelectric generators usually connect a single-phase dry-type transformer to the grounding loop. However, current studies on the distortion and attenuation of partial discharge pulse current signals by the stator windings have neglected the influence of the grounding loop. In fact, the cables or grounding busbars used in the grounding loops of some power plant hydroelectric generators exceed 10 meters in length, and the capacity of the grounding dry-type transformer exceeds 100 kVA. Clearly, the distributed parameter characteristics (resistance, inductance, capacitance) of the grounding cables or busbars, as well as the complex frequency-varying impedance characteristics of the dry-type transformer, will affect partial discharge monitoring, potentially leading to non-negligible signal distortion and attenuation, thus affecting the effectiveness of the partial discharge monitoring system. Summary of the Invention

[0004] This disclosure provides a method, apparatus, equipment, and medium for assessing the propagation of partial discharge in a generator stator winding grounding circuit, in order to at least solve the above-mentioned technical problems existing in the prior art.

[0005] According to a first aspect of this application, a method for assessing the propagation of partial discharge in a generator stator winding grounding circuit is provided, the method comprising:

[0006] Obtain frequency response characteristic data of primary electrical equipment in the stator winding grounding circuit;

[0007] Based on the frequency response characteristic data, a first simulation model of the stator winding grounding circuit is constructed;

[0008] Acquire the propagation and decay characteristics of the partial discharge pulse current signal in the stator winding grounding circuit;

[0009] Based on the propagation decay characteristic data, the first simulation model is optimized to obtain the second simulation model;

[0010] Construct a quantitative evaluation model based on quantitative evaluation parameters;

[0011] The stator winding grounding loop to be evaluated is input into the second simulation model to obtain pulse data;

[0012] The pulse data is input into the quantization evaluation model to obtain the evaluation index of the stator winding grounding circuit to be evaluated on the propagation of partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding circuit on the propagation of partial discharge.

[0013] In one embodiment, the primary electrical equipment includes: a grounding cable or copper busbar, and a dry-type single-phase transformer; acquiring the frequency response characteristic data of the primary electrical equipment in the stator winding grounding circuit includes:

[0014] Frequency response characteristic data of cables or copper busbars and dry-type single-phase transformers in the stator winding grounding circuit are obtained using a vector network analyzer.

[0015] In one possible implementation, acquiring the propagation and decay characteristics data of the partial discharge pulse current signal in the stator winding grounding circuit includes:

[0016] A standard pulse signal is injected into the stator winding grounding circuit near the neutral point using a pulse generator.

[0017] Obtain the response pulse current signal at the grounding terminal in the stator winding grounding circuit, and use the response pulse current signal as the response pulse measurement value;

[0018] Analyze the propagation decay characteristics of the pulse current signal; wherein, the propagation decay characteristics include time-domain distortion characteristics and frequency-domain distortion characteristics.

[0019] In one possible implementation, optimizing the first simulation model based on the propagation decay characteristic data to obtain the second simulation model includes:

[0020] A standard pulse signal is injected into the first simulation model near the neutral point of the winding to obtain the simulated response pulse value output by the first simulation model;

[0021] The simulated response pulse value is compared with the pre-acquired measured response pulse value;

[0022] Based on the comparison results, the first simulation model is iteratively updated until convergence to obtain the second simulation model.

[0023] In one possible implementation, the quantization evaluation parameters include: time-domain characteristic parameters and frequency-domain characteristic parameters; wherein,

[0024] The time-domain characteristic parameters include at least one of the following: pulse peak attenuation ratio, rising edge distortion coefficient, pulse width expansion factor, and waveform similarity deviation.

[0025] The frequency domain characteristic parameters include at least one of the following: spectral centroid offset, bandwidth compression ratio, and multi-band energy attenuation coefficient.

[0026] In one possible implementation, constructing a quantitative evaluation model based on quantitative evaluation parameters includes:

[0027] Obtain time-domain and frequency-domain feature parameters;

[0028] An evaluation index is calculated based on the weighting coefficients corresponding to the time-domain and frequency-domain feature parameters, and the time-domain and frequency-domain feature parameters, respectively; wherein, the evaluation index is determined by weighting each quantitative evaluation parameter.

[0029] In one possible implementation, it further includes:

[0030] Based on the second simulation model, pulse data of stator winding grounding circuits with different configurations were obtained;

[0031] The pulse data of the stator winding grounding circuits with different configurations are sequentially input into the quantitative evaluation model to obtain the evaluation index of the stator winding grounding circuits with different configurations on the propagation of partial discharge signals, so as to evaluate the influence of the stator winding grounding circuits with different configurations on the propagation of partial discharge.

[0032] According to a second aspect of this application, a device for evaluating the propagation of partial discharge in a generator stator winding grounding circuit is provided, the device comprising:

[0033] The first acquisition module is used to acquire frequency response characteristic data of primary electrical equipment in the stator winding grounding circuit;

[0034] The first construction module is used to construct a first simulation model of the stator winding grounding circuit based on the frequency response characteristic data;

[0035] The second acquisition module is used to acquire the propagation and decay characteristics data of the partial discharge pulse current signal in the stator winding grounding circuit;

[0036] The model optimization module is used to optimize the first simulation model to obtain a second simulation model based on the propagation decay characteristic data.

[0037] The second building module is used to construct a quantitative evaluation model based on the quantitative evaluation parameters;

[0038] The data simulation module is used to input the stator winding grounding circuit to be evaluated into the second simulation model to obtain pulse data;

[0039] The data evaluation module is used to input the pulse data into the quantization evaluation model to obtain the evaluation index of the grounding loop on the propagation of partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding loop on the propagation of partial discharge.

[0040] According to a third aspect of this application, an electronic device is provided, comprising:

[0041] At least one processor;

[0042] and a memory communicatively connected to the at least one processor; wherein,

[0043] The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the method described in this application.

[0044] According to a fourth aspect of this application, a non-transitory computer-readable storage medium is provided storing computer instructions for causing the computer to perform the methods described in this application.

[0045] According to a fifth aspect of this application, a computer program product is provided, comprising a computer program or instructions that, when executed by a processor, implement the method described in this application.

[0046] Using the technical solution of this application, the stator winding grounding circuit can be simulated through the second simulation model and the quantitative evaluation model, and then the insulation status of the unit can be evaluated through the quantitative evaluation model, thereby improving the reliability and effectiveness of the unit insulation status evaluation.

[0047] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0048] The above and other objects, features, and advantages of exemplary embodiments of this application will become readily apparent from the following detailed description taken in conjunction with the accompanying drawings. Several embodiments of this application are illustrated in the drawings by way of example and not limitation, in which:

[0049] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0050] Figure 1 A schematic diagram illustrating the implementation process of the partial discharge propagation assessment method for the generator stator winding grounding circuit in an embodiment of this application is shown.

[0051] Figure 2The generator stator winding grounding circuit injection terminal signal is shown in an embodiment of this application;

[0052] Figure 3 The generator stator winding grounding circuit response terminal signal is shown in an embodiment of this application;

[0053] Figure 4 This paper shows a block diagram illustrating the implementation of the generator stator winding grounding circuit partial discharge propagation assessment device in an embodiment of this application.

[0054] Figure 5 A schematic diagram of the composition structure of the electronic device in an embodiment of this application is shown. Detailed Implementation

[0055] To make the objectives, features, and advantages of this application more apparent and understandable, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] In the following description, the terms "first" and "second" are used merely to distinguish similar objects and do not represent a specific ordering of objects. It is understood that "first" and "second" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0057] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0058] The following description, in conjunction with the accompanying drawings, introduces a method, apparatus, equipment, and medium for assessing the propagation of partial discharge in a generator stator winding grounding circuit provided in this application.

[0059] like Figure 1 As shown, this application provides a method for evaluating the propagation of partial discharge in a generator stator winding grounding circuit, the method comprising:

[0060] S101, Obtain the frequency response characteristic data of the primary electrical equipment in the stator winding grounding circuit.

[0061] In some embodiments, the primary electrical equipment includes: a grounding cable or copper busbar, and a dry-type single-phase transformer; acquiring the frequency response characteristic data of the primary electrical equipment in the stator winding grounding circuit includes:

[0062] Frequency response characteristic data of cables or copper busbars and dry-type single-phase transformers in the stator winding grounding circuit are obtained using a vector network analyzer.

[0063] A vector network analyzer is used to measure the transmission characteristics, reflection characteristics, amplitude-frequency characteristics, and phase-frequency characteristics of a device / circuit under test (DUT) at different frequencies, obtaining a frequency-response curve. Specifically, in this application, the vector network analyzer is a broadband electrical characteristic measurement instrument used to output a broadband sweep excitation signal to the primary electrical device under test and to acquire the response signal transmitted through the primary electrical device. This allows for the acquisition of the amplitude and phase responses of the primary electrical device within a preset frequency range, resulting in corresponding frequency response characteristic data.

[0064] In this application, for large-scale hydro-generator units in actual operation, the stator winding neutral point grounding wire can be disconnected during power outage maintenance, i.e., only the grounding loop is considered. Then, a vector network analyzer is used to measure the frequency response characteristics of the cables or copper busbars and dry-type single-phase transformers in the grounding loop separately.

[0065] Taking a 600 MW large hydro-generator as an example, during a power outage maintenance period, the three-phase high-voltage terminal leads and neutral point leads of the hydro-generator are disconnected. The three-phase high-voltage terminal and neutral point leads are short-circuited to ground, and both ends of the neutral point grounding circuit are left suspended. A vector network analyzer is used to measure the frequency characteristics of the cables or copper busbars and dry-type single-phase transformers in the grounding circuit in the 10Hz-100MHz frequency band.

[0066] S102, Based on the frequency response characteristic data, construct the first simulation model of the stator winding grounding circuit.

[0067] In some embodiments, this application uses a vector network analyzer to obtain measured frequency response characteristics of grounding cables or copper busbars and dry-type single-phase transformers in actual operation of large-scale hydro-generator units. The measured frequency response characteristics data are then used to construct a first simulation model, thereby making the first simulation model more accurate. In this application, the first simulation model is a high-frequency equivalent circuit simulation model of the grounding loop, including a distributed parameter transmission line model of the grounding cable or copper busbar and a lumped parameter π-type or T-type high-frequency equivalent circuit simulation model of the dry-type single-phase transformer.

[0068] Taking a 600 MW large hydroelectric generator as an example, the grounding cable is approximately 30 meters long with a cross-sectional area of ​​1 square centimeter, the shield is grounded, and the grounding transformer capacity is 135 kVA. A high-frequency equivalent circuit simulation model is constructed using multiphysics simulation software.

[0069] S103, acquire the propagation and decay characteristics data of the partial discharge pulse current signal in the stator winding grounding circuit.

[0070] In some embodiments, acquiring the propagation and decay characteristics data of the partial discharge pulse current signal in the stator winding grounding circuit includes:

[0071] A standard pulse signal is injected into the stator winding grounding circuit near the neutral point using a pulse generator.

[0072] Obtain the response pulse current signal at the grounding terminal in the stator winding grounding circuit, and use the response pulse current signal as the response pulse measurement value;

[0073] Analyze the propagation decay characteristics of the pulse current signal; wherein, the propagation decay characteristics include time-domain distortion characteristics and frequency-domain distortion characteristics.

[0074] It should be noted that a pulse generator is a measuring instrument capable of generating a standard pulse signal with specific amplitude, rise time, width, and repetition frequency. It is used to simulate the rapid pulse current signal generated by partial discharge in the stator winding of a generator, providing a standard excitation source for testing the pulse propagation characteristics of the stator winding grounding circuit. In this application, a pulse generator is used as the standard excitation signal source. The pulse generator outputs a standard narrow pulse signal with a steep rise time and adjustable amplitude and width to equivalently simulate the pulse signal generated by partial discharge in the stator winding. The standard pulse signal is injected into the stator winding grounding circuit near the winding neutral point to excite the grounding circuit and obtain its pulse transmission and attenuation response, thereby obtaining propagation and decay characteristic data of the partial discharge pulse current signal.

[0075] Similarly, in this application, for large-scale hydro-generator units in actual operation, the stator winding neutral point grounding wire is disconnected during the power outage maintenance period. A pulse generator is used to inject a standard pulse signal into the grounding circuit near the winding neutral point. The response pulse is measured at the grounding end of the grounding circuit, and the propagation and decay characteristics of the signal are analyzed, specifically the time-domain distortion characteristics and frequency-domain distortion characteristics.

[0076] Taking a 600 MW large hydro-generator as an example, during a power outage maintenance period, the three-phase high-voltage terminal leads and neutral point leads of the hydro-generator are disconnected. The three-phase high-voltage terminal leads are short-circuited to ground, and both ends of the neutral point grounding circuit are left floating. Using the IEC60270 calibration pulse, a 500 pC pulse is injected into the grounding circuit near the winding neutral point, and the response pulse is measured at the grounding terminal of the grounding circuit. For example... Figure 2 and Figure 3 As shown, the original signals at the injection and response ends are recorded, and the time-domain and frequency-domain distortion characteristics of the signals are analyzed.

[0077] S104, Based on the propagation decay characteristic data, optimize the first simulation model to obtain the second simulation model.

[0078] In some embodiments, optimizing the first simulation model based on the propagation decay characteristic data to obtain the second simulation model includes:

[0079] A standard pulse signal is injected into the first simulation model near the neutral point of the winding to obtain the simulated response pulse value output by the first simulation model;

[0080] The simulated response pulse value is compared with the pre-acquired measured response pulse value;

[0081] Based on the comparison results, the first simulation model is iteratively updated until convergence to obtain the second simulation model.

[0082] In some embodiments, a pulse generator is used to inject a standard pulse signal into the stator winding grounding loop near the winding neutral point to simulate the pulse excitation generated by partial discharge. The corresponding response pulse current signal is acquired at the grounding end of the stator winding grounding loop and used as the measured response pulse value. Time-domain and frequency-domain analysis is performed on the acquired pulse current signal to obtain the amplitude attenuation, waveform distortion, and spectral variation characteristics of the pulse signal after transmission in the grounding loop, thereby obtaining the propagation decay characteristic data of the partial discharge pulse current signal. The first simulation model is optimized based on the propagation decay characteristic data to obtain a second simulation model. Specifically, the same standard pulse signal as measured is injected into the first simulation model near the winding neutral point to obtain the simulated response pulse value output by the first simulation model. The simulated response pulse value is compared with the pre-acquired measured response pulse value to analyze the difference between the simulation result and the measured result. The parameters in the first simulation model are iteratively corrected according to the comparison results until the simulation output and the measured result tend to be consistent. After convergence, a second simulation model matching the actual stator winding grounding loop characteristics is obtained.

[0083] In this embodiment, simulation is conducted using the high-frequency equivalent circuit of the grounding loop. A 500pC pulse is injected, and the response pulse at the grounding terminal of the grounding loop is measured and compared with the measured data. Based on the differences between the measured data and the simulated data, the equivalent circuit model of the cable or copper busbar and the dry-type single-phase transformer is corrected to ensure the effectiveness of the simulation model.

[0084] S105, Construct a quantitative evaluation model based on quantitative evaluation parameters.

[0085] In some embodiments, the quantization evaluation parameters include: time-domain feature parameters and frequency-domain feature parameters; wherein, the time-domain feature parameters include at least one of: pulse peak attenuation ratio, rising edge distortion coefficient, pulse width expansion factor, and pulse waveform similarity deviation;

[0086] The frequency domain characteristic parameters include at least one of the following: spectral centroid offset, bandwidth compression ratio, and multi-band energy attenuation coefficient.

[0087] Among them, the pulse peak attenuation ratio rising edge distortion coefficient Pulse width expansion factor Similarity deviation with pulse waveform Used to represent the time-domain variation of a signal. Spectral centroid offset. Band compression ratio and multi-band energy attenuation coefficient Used to represent changes in the signal spectrum. Specifically:

[0088] Pulse peak attenuation ratio ,in, and They represent the response pulses respectively. and injection pulse The amplitude, pulse peak attenuation ratio is used to measure the degree of pulse amplitude attenuation.

[0089] rising edge distortion coefficient ,in, and Representing the response pulses respectively and injection pulse The rise time and rise edge distortion coefficient are used to measure the degree of pulse rise edge distortion. In this embodiment, the rise time is the time from 10% to 90% of the signal amplitude.

[0090] Pulse width expansion factor ,in, and Representing the response pulses respectively and injection pulse The pulse width is measured by the pulse width expansion factor, which measures the degree of change in pulse width. In this embodiment, the pulse width is defined by default as half-width at half-maximum, which is the time interval between two time points corresponding to half the peak amplitude after taking the absolute value or Hilbert envelope of the pulse signal.

[0091] Pulse waveform similarity deviation ,in, and Representing the response pulses respectively and injection pulse The rising edge segment of the signal, and Representing the response pulses respectively and injection pulse Excluding the oscillation segment after the rising edge, DTW refers to calculating the similarity between two signal segments using a dynamic time warping algorithm. and These represent the weights of the similarity between the rising edge signal and the oscillation segment signal, respectively. The pulse waveform similarity deviation is measured by segmented weighting to determine the degree of change in the pulse time-domain waveform. In this embodiment, the rising edge signal is the signal whose amplitude rises from 10% to 90%, and the oscillation segment signal is the signal after the rising edge.

[0092] Spectral centroid offset ,in, and Representing the response pulses respectively and injection pulse The spectral centroid measures the degree of pulse frequency offset.

[0093] Band compression ratio ,in, and Representing the response pulses respectively and injection pulse The effective bandwidth measures the degree of change in pulse energy distribution. In this embodiment, the effective bandwidth uses the frequency range that includes 90% of the total energy.

[0094] Multi-band energy attenuation coefficient ,in, , and Representing the response pulses respectively Low-frequency, mid-frequency, and high-frequency energy, , and These represent the injection pulses respectively. Low-frequency, mid-frequency, and high-frequency energy, , and These represent the weights of the energy ratios in the low-frequency, mid-frequency, and high-frequency bands of the pulse, respectively. The multi-band energy attenuation coefficient measures the degree of energy variation in the pulse frequency domain by weighting the frequency bands. In this embodiment, the low-frequency band is <3MHz, the mid-frequency band is 3MHz-30MHz, and the high-frequency band is >30MHz. , and The values ​​are 0.3, 0.3 and 0.4 respectively.

[0095] In some embodiments, constructing a quantitative evaluation model based on quantitative evaluation parameters includes:

[0096] Obtain time-domain and frequency-domain feature parameters;

[0097] An evaluation index is calculated based on the weighting coefficients corresponding to the time-domain and frequency-domain feature parameters, and the time-domain and frequency-domain feature parameters, respectively; wherein, the evaluation index is determined by weighting each quantitative evaluation parameter.

[0098] Specifically, in this application, the weighting coefficients corresponding to the time-domain feature parameters and the frequency-domain feature parameters are respectively... , , , , , and The evaluation index is calculated using the following method:

[0099]

[0100] Using evaluation index A comprehensive assessment was conducted on the impact of the grounding loop on the propagation of partial discharge pulse current, including... The first four parameters are analyzed primarily from a time-domain perspective, while the latter three are analyzed primarily from a frequency-domain perspective. In this embodiment, , , , .

[0101] S106, input the stator winding grounding circuit to be evaluated into the second simulation model to obtain pulse data.

[0102] For the stator winding grounding loop to be evaluated, a standard pulse signal can be injected into the stator winding grounding loop near the neutral point of the winding in the second simulation model. The response pulse at the grounding end of the grounding loop can be measured in the second simulation model to obtain the pulse data of the stator winding grounding loop to be evaluated.

[0103] S107, The pulse data is input into the quantization evaluation model to obtain the evaluation index of the stator winding grounding circuit to be evaluated on the propagation of partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding circuit on the propagation of partial discharge.

[0104] Specifically, the pulse data mentioned above is input into the quantitative evaluation model, and the output is the evaluation index of the stator winding grounding circuit to be evaluated on the propagation of partial discharge signal. This evaluation index is used to quantitatively characterize the influence of the stator winding grounding circuit on the propagation of partial discharge signal.

[0105] In this application, the influence of the generator stator winding grounding circuit on the propagation of partial discharge pulse current is 15%. That is, without considering the stator winding, the influence of the grounding circuit on the partial discharge pulse reaches 15%, indicating that the influence of the grounding circuit on the partial discharge transmission cannot be ignored.

[0106] The method for evaluating the propagation of partial discharge in a generator stator winding grounding circuit provided in this application establishes a first simulation model using frequency response characteristic data of primary electrical equipment in the tested stator winding grounding circuit. The first simulation model is then optimized using propagation and decay characteristic data of the partial discharge pulse current signal in the tested stator winding grounding circuit, resulting in a second simulation model. After constructing a quantized evaluation model using quantized evaluation parameters, the stator winding grounding circuit to be evaluated is input into the second simulation model, obtaining pulse data output by the second simulation model. This pulse data is then input into the quantized evaluation model. The quantized evaluation model outputs an evaluation index of the stator winding grounding circuit's influence on the propagation of the partial discharge signal; that is, the impact of the stator winding grounding circuit on the propagation of the partial discharge.

[0107] The generator stator winding grounding circuit partial discharge propagation assessment method provided in this application can simulate the stator winding grounding circuit through a second simulation model and a quantitative assessment model, and then assess the insulation status of the unit through the quantitative assessment model, thereby improving the reliability and effectiveness of the unit insulation status assessment.

[0108] In some embodiments, the generator stator winding grounding circuit partial discharge propagation assessment method provided in this application further includes:

[0109] Based on the second simulation model, pulse data of stator winding grounding circuits with different configurations were obtained;

[0110] The pulse data of the stator winding grounding circuits with different configurations are sequentially input into the quantitative evaluation model to obtain the evaluation index of the stator winding grounding circuits with different configurations on the propagation of partial discharge signals, so as to evaluate the influence of the stator winding grounding circuits with different configurations on the propagation of partial discharge.

[0111] As an example, based on the second simulation model, several stator winding grounding loops with different configurations are constructed. Pulse data acquisition is performed on each stator winding grounding loop configuration to obtain pulse data corresponding to each configuration. The different stator winding grounding loop configurations can be achieved by adjusting key parameters such as the grounding method, loop impedance parameters, and winding connection method to cover various stator winding grounding loop configuration scenarios that may occur in practical applications. A standard pulse signal is injected into the end of each stator winding grounding loop configuration closest to the winding neutral point, and the response pulse is measured at the grounding end of the grounding loop to complete the pulse data acquisition for a single configuration. The pulse data corresponding to the stator winding grounding loops with different configurations are sequentially input into the quantitative evaluation model. Through the calculation and processing of the quantitative evaluation model, the evaluation index corresponding to each stator winding grounding loop configuration is obtained. Based on the evaluation index corresponding to each configuration, the differences in the impact of stator winding grounding circuits with different configurations on the propagation of partial discharge signals are compared and analyzed, thereby completing the comprehensive evaluation of stator winding grounding circuits with different configurations and providing data support for the configuration selection and optimization design of actual generator stator winding grounding circuits.

[0112] It should be noted that the magnitude of the evaluation index corresponds to the degree of influence of the stator winding grounding circuit on the propagation of partial discharge signals. The larger the evaluation index, the more significant the influence of the grounding circuit configuration on the propagation of partial discharge signals, and vice versa. The specific correspondence can be preset through the training parameters of the quantitative evaluation model.

[0113] like Figure 4 As shown, this application provides a device for evaluating the propagation of partial discharge in a generator stator winding grounding circuit. The device includes:

[0114] The first acquisition module 401 is used to acquire frequency response characteristic data of primary electrical equipment in the stator winding grounding circuit;

[0115] The first construction module 402 is used to construct a first simulation model of the stator winding grounding circuit based on the frequency response characteristic data.

[0116] The second acquisition module 403 is used to acquire the propagation and decay characteristics data of the partial discharge pulse current signal in the stator winding grounding circuit;

[0117] Model optimization module 404 is used to optimize the first simulation model to obtain a second simulation model based on the propagation decay characteristic data;

[0118] The second construction module 405 is used to construct a quantitative evaluation model based on the quantitative evaluation parameters;

[0119] The data simulation module 406 is used to input the stator winding grounding circuit to be evaluated into the second simulation model to obtain pulse data;

[0120] The data evaluation module 407 is used to input the pulse data into the quantization evaluation model to obtain the evaluation index of the grounding circuit on the propagation of the partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding circuit on the propagation of partial discharge.

[0121] In this application, a first acquisition module 401 acquires frequency response characteristic data of the primary electrical equipment in the stator winding grounding circuit. A first construction module 402 constructs a first simulation model of the stator winding grounding circuit based on the frequency response characteristic data. A second acquisition module 403 acquires propagation and decay characteristic data of the partial discharge pulse current signal in the stator winding grounding circuit. A model optimization module 404 optimizes the first simulation model based on the propagation and decay characteristic data to obtain a second simulation model. A second construction module 405 constructs a quantitative evaluation model based on quantitative evaluation parameters. A data simulation module 406 inputs the stator winding grounding circuit to be evaluated into the second simulation model to obtain pulse data. A data evaluation module 407 inputs the pulse data into the quantitative evaluation model to obtain an evaluation index of the grounding circuit on the propagation of the partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding circuit on the propagation of the partial discharge.

[0122] According to embodiments of this application, this application also provides an electronic device and a readable storage medium.

[0123] The electronic device includes at least one processor and a memory communicatively connected to the at least one processor. The memory stores instructions executable by the at least one processor, which, when executed, enable the at least one processor to perform the generator stator winding grounding circuit partial discharge propagation assessment method described in this application. The computer instructions are used to cause the computer to perform the generator stator winding grounding circuit partial discharge propagation assessment method described in this application.

[0124] This application also provides a computer program product, including a computer program / instructions, which, when executed by a processor, implements the generator stator winding grounding circuit partial discharge propagation assessment method of this application.

[0125] Figure 5A schematic block diagram of an example electronic device 800 that can be used to implement embodiments of this application is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the application described and / or claimed herein.

[0126] like Figure 5 As shown, the electronic device 800 includes a computing unit 801, which can perform various appropriate actions and processes based on a computer program stored in a read-only memory (ROM) 802 or a computer program loaded from a storage unit 808 into a random access memory (RAM) 803. The RAM 803 may also store various programs and data required for the operation of the electronic device 800. The computing unit 801, ROM 802, and RAM 803 are interconnected via a bus 804. An input / output (I / O) interface 805 is also connected to the bus 804.

[0127] Multiple components in electronic device 800 are connected to I / O interface 805, including: input unit 806, such as keyboard, mouse, etc.; output unit 807, such as various types of displays, speakers, etc.; storage unit 808, such as disk, optical disk, etc.; and communication unit 809, such as network card, modem, wireless transceiver, etc. Communication unit 809 allows electronic device 800 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0128] The computing unit 801 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 801 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 801 performs the various methods and processes described above, such as the generator stator winding grounding loop partial discharge propagation assessment method. For example, in some embodiments, the generator stator winding grounding loop partial discharge propagation assessment method can be implemented as a computer software program, which is tangibly contained in a machine-readable medium, such as storage unit 808. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 800 via ROM 802 and / or communication unit 809. When the computer program is loaded into RAM 803 and executed by the computing unit 801, one or more steps of the generator stator winding grounding loop partial discharge propagation assessment method described above can be performed. Alternatively, in other embodiments, the computing unit 801 may be configured by any other suitable means (e.g., by means of firmware) to perform a method for evaluating the propagation of partial discharge in the generator stator winding ground loop.

[0129] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0130] The program code used to implement the methods of this application may be written in any combination of one or more programming languages. This program code may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing device, such that when executed by the processor or controller, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The program code may be executed entirely on a machine, partially on a machine, as a standalone software package partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0131] In the context of this application, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable media can be, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0132] To provide interaction with a user, the systems and techniques described herein can be implemented on a computer having: a display device for displaying information to the user (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor); and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the computer. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0133] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as a data server), or computing systems that include middleware components (e.g., an application server), or computing systems that include frontend components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., a communication network). Examples of communication networks include local area networks (LANs), wide area networks (WANs), and the Internet.

[0134] Computer systems can include clients and servers. Clients and servers are generally located far apart and typically interact via communication networks. Client-server relationships are created by computer programs running on the respective computers and having a client-server relationship with each other. Servers can be cloud servers, servers in distributed systems, or servers incorporating blockchain technology.

[0135] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for assessing the propagation of partial discharge in a generator stator winding grounding circuit, characterized in that, The method includes: Obtain frequency response characteristic data of primary electrical equipment in the stator winding grounding circuit; Based on the frequency response characteristic data, a first simulation model of the stator winding grounding circuit is constructed; Acquire the propagation and decay characteristics of the partial discharge pulse current signal in the stator winding grounding circuit; Based on the propagation decay characteristic data, the first simulation model is optimized to obtain the second simulation model; Construct a quantitative evaluation model based on quantitative evaluation parameters; The stator winding grounding loop to be evaluated is input into the second simulation model to obtain pulse data; The pulse data is input into the quantization evaluation model to obtain the evaluation index of the stator winding grounding circuit to be evaluated on the propagation of partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding circuit on the propagation of partial discharge. The quantization evaluation parameters include: time-domain characteristic parameters and frequency-domain characteristic parameters; wherein, The time-domain characteristic parameters include at least one of the following: pulse peak attenuation ratio, rising edge distortion coefficient, pulse width expansion factor, and waveform similarity deviation. The frequency domain characteristic parameters include at least one of the following: spectral centroid offset, bandwidth compression ratio, and multi-band energy attenuation coefficient. The construction of the quantitative evaluation model based on quantitative evaluation parameters includes: Obtain time-domain and frequency-domain feature parameters; An evaluation index is calculated based on the weighting coefficients corresponding to the time-domain and frequency-domain feature parameters, and the time-domain and frequency-domain feature parameters, respectively; wherein, the evaluation index is determined by weighting each quantitative evaluation parameter.

2. The method for evaluating the propagation of partial discharge in a generator stator winding grounding circuit according to claim 1, characterized in that, The primary electrical equipment includes: a grounding cable or copper busbar, and a dry-type single-phase transformer; acquiring the frequency response characteristic data of the primary electrical equipment in the stator winding grounding circuit includes: Frequency response characteristic data of cables or copper busbars and dry-type single-phase transformers in the stator winding grounding circuit are obtained using a vector network analyzer.

3. The method for evaluating the propagation of partial discharge in the generator stator winding grounding circuit according to claim 1, characterized in that, The acquisition of propagation decay characteristic data of partial discharge pulse current signal in stator winding grounding circuit includes: A standard pulse signal is injected into the stator winding grounding circuit near the neutral point using a pulse generator. Obtain the response pulse current signal at the grounding terminal in the stator winding grounding circuit, and use the response pulse current signal as the response pulse measurement value; Analyze the propagation decay characteristics of the pulse current signal; wherein, the propagation decay characteristics include time-domain distortion characteristics and frequency-domain distortion characteristics.

4. The method for evaluating the propagation of partial discharge in the generator stator winding grounding circuit according to claim 3, characterized in that, The process of optimizing the first simulation model based on the propagation decay characteristic data to obtain the second simulation model includes: A standard pulse signal is injected into the first simulation model near the neutral point of the winding to obtain the simulated response pulse value output by the first simulation model; The simulated response pulse value is compared with the pre-acquired measured response pulse value; Based on the comparison results, the first simulation model is iteratively updated until convergence to obtain the second simulation model.

5. The method for evaluating the propagation of partial discharge in a generator stator winding grounding circuit according to claim 1, characterized in that, Also includes: Based on the second simulation model, pulse data of stator winding grounding circuits with different configurations were obtained; The pulse data of the stator winding grounding circuits with different configurations are sequentially input into the quantitative evaluation model to obtain the evaluation index of the stator winding grounding circuits with different configurations on the propagation of partial discharge signals, so as to evaluate the influence of the stator winding grounding circuits with different configurations on the propagation of partial discharge.

6. A device for evaluating the propagation of partial discharge in a generator stator winding grounding circuit, characterized in that, The device includes: The first acquisition module is used to acquire frequency response characteristic data of primary electrical equipment in the stator winding grounding circuit; The first construction module is used to construct a first simulation model of the stator winding grounding circuit based on the frequency response characteristic data; The second acquisition module is used to acquire the propagation and decay characteristics data of the partial discharge pulse current signal in the stator winding grounding circuit; The model optimization module is used to optimize the first simulation model to obtain a second simulation model based on the propagation decay characteristic data. The second building module is used to construct a quantitative evaluation model based on the quantitative evaluation parameters; The data simulation module is used to input the stator winding grounding circuit to be evaluated into the second simulation model to obtain pulse data; The data evaluation module is used to input the pulse data into the quantization evaluation model to obtain the evaluation index of the grounding loop on the propagation of the partial discharge signal; the evaluation index is used to characterize the influence of the stator winding grounding loop on the propagation of partial discharge. The quantization evaluation parameters include: time-domain characteristic parameters and frequency-domain characteristic parameters; wherein, The time-domain characteristic parameters include at least one of the following: pulse peak attenuation ratio, rising edge distortion coefficient, pulse width expansion factor, and waveform similarity deviation. The frequency domain characteristic parameters include at least one of the following: spectral centroid offset, bandwidth compression ratio, and multi-band energy attenuation coefficient. The construction of the quantitative evaluation model based on quantitative evaluation parameters includes: Obtain time-domain and frequency-domain feature parameters; An evaluation index is calculated based on the weighting coefficients corresponding to the time-domain and frequency-domain feature parameters, and the time-domain and frequency-domain feature parameters, respectively; wherein, the evaluation index is determined by weighting each quantitative evaluation parameter.

7. An electronic device, characterized in that, At least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor to enable the at least one processor to perform the generator stator winding grounding circuit partial discharge propagation assessment method according to any one of claims 1 to 5.

8. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, The computer instructions are used to cause the computer to execute the generator stator winding grounding circuit partial discharge propagation assessment method according to any one of claims 1-5.

Images