Resonance elimination method and device for ferromagnetic resonance of power distribution network and computer equipment

Abstract

The invention relates to a resonance elimination method and device for ferromagnetic resonance of a power distribution network, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring sampling voltage data of a power distribution network; inputting the sampled voltage data into a Prony model to obtain parameter information of voltage in the power distribution network; the parameter information comprises the amplitude, the frequency and the attenuation factor of the voltage; when it is detected that ferromagnetic resonance occurs in the power distribution network according to the parameter information, a preset secondary resonance eliminator is adopted to carry out resonance elimination processing on the power distribution network; after the preset time, the sampling voltage data of the power distribution network are obtained again, and new parameter information is obtained; and when it is detected that ferromagnetic resonance still occurs in the power distribution network according to the new parameter information, performing resonance elimination processing on the power distribution network by adopting a preset primary resonance eliminator. By adopting the method, the ferromagnetic resonance can be more effectively eliminated.

Description

Technical Field

[0001] The present application relates to the technical field of power grid detuning, and in particular to a detuning method, device, computer equipment, storage medium and computer program product for ferromagnetic resonance of a distribution network. Background Art

[0002] In a neutral point ungrounded distribution network system, in order to monitor the voltage of the important bus voltage to the ground in real time, an electromagnetic voltage transformer is usually installed at the bus. Due to the nonlinear characteristics of the voltage transformer, the distribution network system is prone to ferromagnetic resonance. Ferromagnetic resonance can cause grid voltage fluctuations, equipment overheating and damage, and even cause power accidents.

[0003] In order to solve the ferromagnetic resonance problem, passive inductors are usually used for detuning in traditional technologies. However, this method often only processes harmonics of a specific frequency and is insufficient for nonlinear and time-varying ferromagnetic resonance phenomena, resulting in poor detuning effect on ferromagnetic resonance. Summary of the invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for detuning ferromagnetic resonance of a distribution network, which can achieve better detuning effect on ferromagnetic resonance, in response to the above technical problems.

[0005] In a first aspect, the present application provides a method for detuning ferromagnetic resonance of a distribution network, comprising:

[0006] Obtain sampled voltage data of the distribution network;

[0007] Inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage;

[0008] When it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network;

[0009] After a preset time, reacquire the sampled voltage data of the distribution network and obtain new parameter information;

[0010] When it is detected according to the new parameter information that ferromagnetic resonance still occurs in the distribution network, a preset primary detuning device is used to perform detuning processing on the distribution network.

[0011] In one of the embodiments, when it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network, including:

[0012] Determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information;

[0013] Based on the resonance type, selecting a preset resistance value of the preset secondary detuning device;

[0014] According to the preset resistance value, the preset secondary detuning device is used to perform detuning processing on the distribution network.

[0015] In one embodiment, the sampled voltage data includes sampled voltage data of three-phase voltage; the parameter information includes parameter information of three-phase voltage;

[0016] The determining, according to the parameter information, the resonance type of the ferromagnetic resonance occurring in the distribution network includes:

[0017] When the frequency of the three-phase voltage is the fundamental frequency, the attenuation factor is not zero, and the amplitude meets the preset conditions, the resonance type is determined to be the fundamental frequency resonance; the preset conditions are that the amplitudes of the two-phase voltages are higher than the normal amplitude and the amplitude of one-phase voltage is lower than the normal amplitude, or the amplitudes of the two-phase voltages are lower than the normal amplitude and the amplitude of one-phase voltage is higher than the normal amplitude.

[0018] In one of the embodiments, determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information includes:

[0019] When the amplitudes of the three-phase voltages are all higher than the normal amplitudes, the frequencies are lower than the fundamental frequency, and the attenuation factors are not zero, it is determined that the resonance type is frequency division resonance.

[0020] In one of the embodiments, determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information includes:

[0021] When the amplitudes of the three-phase voltages are all higher than normal amplitudes, the attenuation factor is not zero, and the frequency is a multiple of the fundamental frequency, it is determined that the resonance type is high-frequency resonance.

[0022] In one of the embodiments, the ferromagnetic resonance includes a plurality of resonance modes, and the parameter information includes parameter information of the plurality of resonance modes;

[0023] In the case where ferromagnetic resonance is detected in the distribution network according to the parameter information, before using a preset secondary detuning device to perform detuning processing on the distribution network, the method further includes:

[0024] According to the parameter information of the multiple resonance modes, a target resonance mode with the largest amplitude is selected from the multiple resonance modes;

[0025] When it is detected according to the parameter information that the distribution network has ferromagnetic resonance, a preset secondary detuning device is used to perform detuning processing on the distribution network, including:

[0026] When it is detected that ferromagnetic resonance occurs in the distribution network according to the parameter information of the target resonant mode, a preset secondary detuning device is used to perform detuning processing on the distribution network.

[0027] In a second aspect, the present application further provides a detuning device for ferromagnetic resonance of a power distribution network, comprising:

[0028] A voltage acquisition module is used to obtain sampled voltage data of the distribution network;

[0029] A parameter acquisition module, used for inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage;

[0030] A secondary detuning module, configured to, when it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, use a preset secondary detuning device to perform detuning processing on the distribution network;

[0031] A secondary acquisition module, used to reacquire the sampled voltage data of the distribution network after a preset time and obtain new parameter information;

[0032] The primary detuning module is used to use a preset primary detuning device to perform detuning processing on the distribution network when it is detected that ferromagnetic resonance still occurs in the distribution network according to the new parameter information.

[0033] In a third aspect, the present application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are implemented:

[0034] Obtain sampled voltage data of the distribution network;

[0035] Inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage;

[0036] When it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network;

[0037] After a preset time, reacquire the sampled voltage data of the distribution network and obtain new parameter information;

[0038] When it is detected according to the new parameter information that ferromagnetic resonance still occurs in the distribution network, a preset primary detuning device is used to perform detuning processing on the distribution network.

[0039] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the following steps are implemented:

[0040] Obtain sampled voltage data of the distribution network;

[0041] Inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage;

[0042] When it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network;

[0043] After a preset time, reacquire the sampled voltage data of the distribution network and obtain new parameter information;

[0044] When it is detected according to the new parameter information that ferromagnetic resonance still occurs in the distribution network, a preset primary detuning device is used to perform detuning processing on the distribution network.

[0045] In a fifth aspect, the present application further provides a computer program product, including a computer program, which implements the following steps when executed by a processor:

[0046] Obtain sampled voltage data of the distribution network;

[0047] Inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage;

[0048] When it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network;

[0049] After a preset time, reacquire the sampled voltage data of the distribution network and obtain new parameter information;

[0050] When it is detected according to the new parameter information that ferromagnetic resonance still occurs in the distribution network, a preset primary detuning device is used to perform detuning processing on the distribution network.

[0051] The above-mentioned detuning method, device, computer equipment, storage medium and computer program product for ferromagnetic resonance of the distribution network first obtains the sampled voltage data of the distribution network to actively monitor the operating status of the distribution network in real time; then, the sampled voltage data is input into the Proni model to obtain parameter information of the voltage in the distribution network, wherein the parameter information includes the amplitude, frequency and attenuation factor of the voltage, which can more comprehensively understand the current state of the distribution network and provide a data basis for the subsequent judgment of ferromagnetic resonance; then, when it is detected that ferromagnetic resonance occurs in the distribution network according to the parameter information, a preset secondary detuning device is used to detun the distribution network, and the ferromagnetic resonance is judged according to the parameter information of the voltage, so that the occurrence of ferromagnetic resonance can be accurately identified, and then a pan-harmonic detection method is used to detect the occurrence of ferromagnetic resonance in the distribution network. A highly usable and flexible secondary detuning device is used to detun the distribution network, effectively suppressing ferromagnetic resonance, thereby improving the stability of the distribution network; after a preset time, the sampled voltage data of the distribution network is reacquired, and new parameter information is obtained. By acquiring the sampled voltage data of the distribution network again, and then obtaining the corresponding parameter information, the distribution network is continuously tested, which helps to find out that the detuning of the secondary detuning device is not thorough; then, when it is detected that ferromagnetic resonance still occurs in the distribution network based on the new parameter information, the preset primary detuning device is used to detun the distribution network. When the ferromagnetic resonance has been eliminated by the secondary detuning device, the distribution network is detuned again with a highly targeted primary detuning device, which can handle the ferromagnetic resonance more comprehensively. In the above method, by acquiring the amplitude, frequency and attenuation factor of the voltage in the distribution network, whether ferromagnetic resonance occurs in the distribution network is actively detected, and then timely response is made to perform detuning processing; at the same time, a highly versatile secondary detuning device is first used during detuning processing, and when the secondary detuning device is not completely detuned, a highly targeted primary detuning device is used, which can more comprehensively and accurately detuning the ferromagnetic resonance of the distribution network, thereby improving the detuning effect of the ferromagnetic resonance and ensuring the stable operation of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0053] Figure 1 A diagram showing an application environment of a method for eliminating ferromagnetic resonance in a power distribution network according to an embodiment;

[0054] Figure 2 It is a schematic flow chart of a method for detuning ferromagnetic resonance of a power distribution network in one embodiment;

[0055] Figure 3Schematic diagram of a flow chart of a ferromagnetic resonance combined detuning method based on the Prony algorithm in another embodiment;

[0056] Figure 4 is a schematic structural diagram of a power distribution system in one embodiment;

[0057] Figure 5 is a schematic structural diagram of a voltage transformer in one embodiment;

[0058] Figure 6 1 is a diagram showing the detuning effect of the fundamental frequency resonance in an embodiment, wherein (a) is a diagram showing the detuning effect of a secondary detuning device, (b) is a diagram showing the detuning effect of a primary detuning device, and (c) is a diagram showing the detuning effect of a combined detuning device;

[0059] Figure 7 1 is a diagram showing the detuning effect of frequency division resonance in an embodiment, wherein (a) is a detuning effect diagram of a secondary detuning device, (b) is a detuning effect diagram of a primary detuning device, and (c) is a detuning effect diagram of a combined detuning device;

[0060] Figure 8 It is a structural block diagram of a detuning device for ferromagnetic resonance of a power distribution network in one embodiment;

[0061] Fig. 9 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0062] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0063] The method for eliminating ferromagnetic resonance of a distribution network provided in the embodiment of the present application can be applied to Figure 1In the application environment shown. Among them, the terminal 102 is connected to the distribution network 104, the secondary detuning device 106, and the primary detuning device 108 respectively. The terminal 102 obtains the sampled voltage data of the distribution network 104; the terminal 102 inputs the sampled voltage data into the Proni model to obtain the parameter information of the voltage in the distribution network, wherein the parameter information includes the amplitude, frequency and attenuation factor of the voltage; when it is detected that the distribution network has ferromagnetic resonance according to the parameter information, the terminal 102 uses the preset secondary detuning device 106 to detun the distribution network 104; after the preset time, the terminal 102 re-acquires the sampled voltage data of the distribution network 104 and obtains new parameter information; when it is detected that the distribution network still has ferromagnetic resonance according to the new parameter information, the terminal 102 uses the preset primary detuning device 108 to detun the distribution network 104. Among them, the terminal 102 can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers and other devices with processors.

[0064] In an exemplary embodiment, Figure 2 As shown, a method for eliminating ferromagnetic resonance of a distribution network is provided, and the method is applied to Figure 1 The terminal 102 in the example is used as an example to illustrate, and the following steps are included:

[0065] Step S201, obtaining sampled voltage data of the distribution network.

[0066] Exemplarily, the terminal 102 uses a suitable sensor or monitoring device to continuously sample and record voltage data in the distribution network 104 based on a preset frequency. In particular, a voltage transformer in the distribution network 104 is usually used to obtain the voltage sampling data.

[0067] Step S202: input the sampled voltage data into the Prony model to obtain parameter information of the voltage in the distribution network.

[0068] The parameter information includes the voltage amplitude, frequency and attenuation factor.

[0069] Exemplarily, before inputting the sampled voltage data into the Prony model, the terminal 102 also performs some preprocessing steps including denoising to remove noise interference in the voltage data, as well as data filtering to ensure the quality and accuracy of the input data. Then, the terminal 102 solves the preset Prony model based on the sampled voltage data so that the output of the model is as close as possible to the actual sampled data, and then the signal can be fitted into a multi-modal oscillation waveform to obtain voltage parameter information, including voltage amplitude, phase, frequency and attenuation factor. Afterwards, the terminal 102 can determine in real time whether ferromagnetic resonance occurs in the distribution network 104 based on the amplitude, frequency and attenuation factor.

[0070] Step S203: when it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network.

[0071] Exemplarily, the amplitude of the voltage in the distribution network during normal operation is a preset amplitude, the frequency is the fundamental frequency, and the attenuation factor is zero. When the terminal 102 determines that the distribution network 104 has ferromagnetic resonance based on the parameter information of the voltage, the secondary detuning device 106 is controlled to start to detun the distribution network 104. The secondary detuning device usually increases the impedance of the circuit to reduce or suppress the ferromagnetic resonance. At the same time, the ferromagnetic resonance is judged based on the parameter information obtained by the Proni model, and the secondary detuning device can be started accurately and quickly to reduce the influence of the ferromagnetic resonance on the distribution network.

[0072] Step S204: after a preset time, reacquire the sampled voltage data of the distribution network and obtain new parameter information.

[0073] Exemplarily, after starting the secondary detuning device 106, the terminal 102 will continue to obtain the sampled voltage data of the distribution network 104. It usually takes a certain amount of time to achieve detuning, so the terminal 102 needs to obtain the sampled voltage data of the distribution network after a preset time, and then input the sampled voltage data into the Proni model to obtain new parameter information. Based on the new parameter information, the terminal 102 detects in real time whether the ferromagnetic resonance of the distribution network 104 has been eliminated.

[0074] Step S205: When it is detected according to the new parameter information that ferromagnetic resonance still occurs in the distribution network, a preset primary detuning device is used to perform detuning processing on the distribution network.

[0075] Exemplarily, when the terminal 102 determines that the distribution network 104 still has ferromagnetic resonance based on the new parameter information, the primary detuning device 108 is controlled to start to detun the distribution network 104. The primary detuning device usually achieves detuning by increasing the reactance or conductance of the circuit. In addition, the ferromagnetic resonance with multiple frequency modes is first detuned by using a more versatile secondary detuning device, which can suppress the ferromagnetic resonance as much as possible; then, if the ferromagnetic resonance has not been completely eliminated, the second detuning uses a more targeted primary detuning device to perform accurate detuning, which can also avoid damage to the primary detuning device with lower heat capacity.

[0076] In the above-mentioned method for detuning ferromagnetic resonance of the distribution network, first, the sampled voltage data of the distribution network is obtained to actively monitor the operating status of the distribution network in real time; then, the sampled voltage data is input into the Proni model to obtain parameter information of the voltage in the distribution network, wherein the parameter information includes the amplitude, frequency and attenuation factor of the voltage, which can more comprehensively understand the current state of the distribution network and provide a data basis for the subsequent judgment of ferromagnetic resonance; then, when it is detected that ferromagnetic resonance occurs in the distribution network according to the parameter information, a preset secondary detuner is used to detun the distribution network, and the ferromagnetic resonance is judged according to the parameter information of the voltage, which can accurately identify the occurrence of ferromagnetic resonance, and then a highly versatile and flexible secondary detuner is used. The secondary detuning device performs detuning on the distribution network, effectively suppressing ferromagnetic resonance, thereby improving the stability of the distribution network; after a preset time, the sampled voltage data of the distribution network is reacquired, and new parameter information is obtained. By acquiring the sampled voltage data of the distribution network again, and then obtaining the corresponding parameter information, the distribution network is continuously tested, which helps to discover the situation where the secondary detuning device is not completely detuned; then, when it is detected based on the new parameter information that ferromagnetic resonance still occurs in the distribution network, the preset primary detuning device is used to perform detuning on the distribution network. When the ferromagnetic resonance has been eliminated by the secondary detuning device, the distribution network is detuned again with a highly targeted primary detuning device, which can more comprehensively handle the ferromagnetic resonance. In the above method, by acquiring the amplitude, frequency and attenuation factor of the voltage in the distribution network, whether ferromagnetic resonance occurs in the distribution network is actively detected, and then timely response is made to perform detuning processing; at the same time, a highly versatile secondary detuning device is first used during detuning processing, and when the secondary detuning device is not completely detuned, a highly targeted primary detuning device is used, which can more comprehensively and accurately detuning the ferromagnetic resonance of the distribution network, thereby improving the detuning effect of the ferromagnetic resonance and ensuring the stable operation of the distribution network.

[0077] In an exemplary embodiment, the above-mentioned step S203 uses a preset secondary detuning device to perform detuning processing on the distribution network when ferromagnetic resonance is detected in the distribution network according to the parameter information, and also includes: determining the resonance type of the ferromagnetic resonance in the distribution network according to the parameter information; based on the resonance type, selecting a preset resistance value of the preset secondary detuning device; and according to the preset resistance value, using the preset secondary detuning device to perform detuning processing on the distribution network.

[0078] Exemplarily, after detecting the ferromagnetic resonance, the terminal needs to further determine the type of resonance. Ferromagnetic resonance can have different types, including fundamental frequency resonance, frequency division resonance, and high frequency resonance. Once the terminal determines the type of ferromagnetic resonance, it selects a preset resistance value associated with the resonance type. Then, the terminal adjusts the preset secondary detuning device according to the resistance value.

[0079] Similarly, in the above step S205, the terminal may also determine the resonance type based on the new parameter information, and then start the preset primary detuning device associated with the resonance type according to the resonance type.

[0080] In this embodiment, by determining the specific type of ferromagnetic resonance, the most appropriate detuning parameter can be selected to achieve more accurate resonance suppression. At the same time, targeted processing of different types of ferromagnetic resonance can improve the stability of the power system and reduce potential problems caused by resonance.

[0081] In an exemplary embodiment, the sampled voltage data includes sampled voltage data of the three-phase voltage, and the parameter information includes parameter information of the three-phase voltage; the above-mentioned determination of the resonance type of ferromagnetic resonance occurring in the distribution network based on the parameter information also includes: when the frequency of the three-phase voltage is the fundamental frequency, the attenuation factor is not zero, and the amplitude meets the preset conditions, determining that the resonance type is the fundamental frequency resonance; the preset conditions are that the amplitudes of the two-phase voltages are higher than the normal amplitude and the amplitude of the one-phase voltage is lower than the normal amplitude, or the amplitudes of the two-phase voltages are lower than the normal amplitude and the amplitude of the one-phase voltage is higher than the normal amplitude.

[0082] Furthermore, in an exemplary embodiment, the above-mentioned determination of the resonance type of ferromagnetic resonance occurring in the distribution network based on parameter information also includes: when the amplitudes of the three-phase voltages are all higher than the normal amplitude, the frequencies are lower than the fundamental frequency and the attenuation factor is not zero, determining that the resonance type is a divided-frequency resonance.

[0083] Further, in an exemplary embodiment, the above-mentioned determination of the resonance type of ferromagnetic resonance occurring in the distribution network based on parameter information also includes: when the amplitudes of the three-phase voltages are all higher than the normal amplitudes, the attenuation factor is not zero and the frequency is a multiple of the fundamental frequency, determining that the resonance type is high-frequency resonance.

[0084] Exemplarily, ① if the terminal detects that the frequency of the three-phase voltage is consistent with the fundamental frequency of the power system, it may indicate the existence of fundamental frequency resonance. Then, when the attenuation factor of the resonant frequency is not zero, it indicates that the resonant signal is not a simple steady-state oscillation, but has an attenuation characteristic, which may be a sign of ferromagnetic resonance. The terminal further checks the amplitude of the resonant signal. If the amplitude meets the preset conditions, that is, the amplitude of the two-phase voltage is higher than the normal amplitude and the amplitude of the one-phase voltage is lower than the normal amplitude, or the amplitude of the two-phase voltage is lower than the normal amplitude and the amplitude of the one-phase voltage is higher than the normal amplitude, then it can be determined that ferromagnetic resonance has occurred in the distribution network and the resonance type is fundamental frequency resonance. ② If the terminal detects that the amplitudes of the three-phase voltages are all higher than the normal amplitude, the frequency is lower than the fundamental frequency, and the attenuation factor is not zero, then it can be determined that ferromagnetic resonance has occurred in the distribution network and the resonance type is frequency division resonance. ③ If the terminal detects that the amplitudes of the three-phase voltages are all higher than the normal amplitude, the attenuation factor is not zero, and the frequency is a multiple of the fundamental frequency, then it can be determined that ferromagnetic resonance has occurred in the distribution network and the resonance type is high-frequency resonance. Among them, the fundamental frequency is usually 50HZ.

[0085] In the above embodiment, by considering the frequency, attenuation factor and amplitude conditions and making judgments based on various parameter information, the type of ferromagnetic resonance can be determined more accurately so that appropriate detuning measures can be taken.

[0086] In an exemplary embodiment, ferromagnetic resonance includes multiple resonant modes, and the parameter information includes parameter information of the multiple resonant modes; in the above step S203, when ferromagnetic resonance is detected in the distribution network according to the parameter information, before using a preset secondary detuning device to perform detuning on the distribution network, it also includes: according to the parameter information of the multiple resonant modes, from the multiple resonant modes, screening out the target resonant mode with the largest amplitude.

[0087] Further, in an exemplary embodiment, the above-mentioned step S203 uses a preset secondary detuning device to perform detuning on the distribution network when ferromagnetic resonance is detected in the distribution network according to parameter information, and also includes: when ferromagnetic resonance is detected in the distribution network according to parameter information of the target resonant mode, uses a preset secondary detuning device to perform detuning on the distribution network.

[0088] Exemplarily, the Proni model fits the signal into a multi-modal oscillation waveform, that is, multiple resonant modes. The terminal needs to determine the resonant mode that best represents the current state of the distribution network: by comparing the parameter information of different resonant modes, it can be determined which resonant mode has the largest amplitude, indicating that it may have the greatest impact on the stability of the system. After determining the target resonant mode with the largest amplitude, based on the parameter information of the target resonant mode, it is determined whether ferromagnetic resonance has occurred in the distribution network, and then subsequent processing is performed.

[0089] In this embodiment, by screening out the target resonance mode with the largest amplitude, it is possible to accurately determine whether ferromagnetic resonance currently occurs in the distribution network. At the same time, subsequent detuning processing is performed based on the target resonance mode to ensure that ferromagnetic resonance in the distribution network can be more thoroughly eliminated, thereby improving the stability of the power system.

[0090] In an exemplary embodiment, in order to more clearly illustrate the detuning of the ferromagnetic resonance of the distribution network provided in the embodiment of the present application, the detuning of the ferromagnetic resonance of the distribution network is specifically described below with a specific embodiment. In one embodiment, Figure 3 As shown, the present application also provides a ferromagnetic resonance combination detuning method based on the Prony algorithm, which specifically includes the following steps:

[0091] Step S301, using the Prony algorithm, continuously analyzing the amplitude, frequency, and attenuation factor of the phase voltage to identify ferromagnetic resonance of the distribution network.

[0092] Step S302, after the occurrence of ferromagnetic resonance is detected, a damping resistor is added to the secondary detuning device, and the secondary detuning device is started to perform detuning processing.

[0093] Step S303: After a preset time, it is detected again based on the Prony algorithm whether the ferromagnetic resonance is eliminated.

[0094] Step S304: if the ferromagnetic resonance has been eliminated, the secondary detuning device is exited and the distribution network resumes normal operation.

[0095] Step S305: if the ferromagnetic resonance is not eliminated, the secondary detuning device is exited, and the primary detuning device is started to consume the resonance energy through the damping resistor.

[0096] Step S306: the ferromagnetic resonance is eliminated, the primary detuning device is exited, and the distribution network resumes normal operation.

[0097] For example, when ferromagnetic resonance occurs in the power distribution system, the three-phase voltage of the voltage transformer is a superposition of the power frequency component and the resonant component. A , U B , U C It is expressed as follows:

[0098]

[0099] Among them, U AN , U BN , U CN is the power frequency component of the phase voltage; U AX , U BX , U CX is the phase voltage resonant component, and the line voltage expression can be obtained from the above formula as follows:

[0100]

[0101] When the voltage transformer has ferromagnetic resonance, the line voltage is still the rated voltage, so the second term on the right side of the above equation is zero, and U AX =U BX =U CX =U X ,then:

[0102]

[0103] Ignoring the transformer leakage flux and resistance voltage drop, the three-phase flux is as follows:

[0104]

[0105] Where N is the number of turns of the high voltage side winding, is the phase flux component; is the resonant component of each phase flux, and the zero-sequence flux is defined as the sum of the three-phase fluxes, that is:

[0106]

[0107] When the voltage transformer operates at rated voltage, the core magnetic link is close to saturation. At this time, the excitation inductance of the winding is linear. However, when the winding voltage increases or the excitation surge current appears due to some external reasons, the core is saturated and the excitation inductance exhibits nonlinear characteristics. With appropriate parameter matching, the distribution system will produce different types of resonant overvoltages.

[0108] For Prony's algorithm:

[0109] (1) The Prony algorithm can fit the signal into a multi-modal low-frequency oscillation waveform. Assume that the function after fitting is

[0110]

[0111] Where L is the number of oscillation modes, A i , σ i 、f i ,φ i are the amplitude, attenuation factor, frequency and phase of the oscillation mode, which are unknown parameters to be identified.

[0112] (2) Applying the Euler formula, the sampling interval T of the fitting signal is used for discretization, and y(t) can be simplified to

[0113]

[0114] in,

[0115] (3) Then the parameter to be identified is A i , σ i 、fi ,φ i Convert to C i , μ i ;

[0116] μ i The solution is expressed by the following equation: i )(μ-μ2)…(μ-μ 2L )=0

[0117] Equivalent to: μ 2L =A1μ 2L-1 +a2μ 2L-2 +…+a 2L

[0118] For μ 2L The solution of μ i The identification is transformed into a i Identification of

[0119] In summary,

[0120] (4) The least squares method can be used to fit and solve a i , a i Substitute μ 2L It can be solved to get μ i , μ i Substitute y(k) and use the least squares method to fit and solve C i , C i , μ i After obtaining, we can calculate A i , σ i 、f i ,φ i :

[0121]

[0122] In a specific example, the primary detuning device is installed between the neutral point of the primary side of the voltage transformer and the ground, and the secondary detuning device is installed on the open delta winding on the secondary side of the voltage transformer. When the resonance is detected by the Proni algorithm, the secondary detuning device starts to input the damping resistor, which is equivalent to connecting a small resistor in parallel on the high-voltage side to play a shunt role, thereby suppressing the resonance; the primary detuning device increases the reactance of the zero-sequence circuit, consumes the resonance energy, and thus suppresses the resonance.

[0123] Taking the ferromagnetic resonance detuning of 110KV / 35KV distribution system as an example, the least square method is used to fit the excitation characteristics of JDJJ2-35 electromagnetic voltage transformer. Figure 4 The power distribution system is simulated and modeled, where E A 、E B 、E Cis the three-phase voltage of the power distribution system, L is the inductor, C1, C2, C3 are capacitors, R1, R2 are resistors, S1, S2, S3 are switches, GND1, GND2 are ground wires. When the excitation inductance is in the unsaturated region, the current and magnetic flux are in a linear relationship, and this example uses an exponential function to fit. When working in the saturated region, the current and magnetic flux are in a nonlinear relationship, and a quadratic function is used to fit.

[0124] The unsaturated region is expressed as an exponential function Fitting:

[0125] Take the logarithm of both sides of the equation Pick Available Fitting error

[0126] satisfy The total error of the condition is the smallest, so we can get:

[0127]

[0128] Saturation region function y2=c+dx+ex 2 , the following restrictions must be met:

[0129]

[0130] Among them, (H1, B1) is the segmentation point, we can get The derived total error expression is:

[0131]

[0132] when The solution is e.

[0133] The integral path is π(r1+r2), where r1 and r2 are the inner and outer diameters of the transformer core, and ∮ l Hdl=I, and the solution is Substituting into the fitting curve:

[0134]

[0135] According to have to n is the number of turns of the transformer coil, l is the length of the voltage transformer core;

[0136]

[0137] According to the above derived formula, the measured magnetic induction intensity and magnetic field intensity are fitted to establish an accurate voltage transformer model.

[0138] The principle of single-phase voltage transformer is as follows Figure 5 As shown, L1 and R1 are the leakage inductance and resistance of the high-voltage side winding, R m , L s are the transformer core excitation resistance and excitation inductance, L2 and L3 are the inductance on the secondary side, R2 and R3 are the resistance on the secondary side, and thus a simulation model of the voltage transformer can be established.

[0139] A 35KV distribution system simulation model is built. The neutral point of the 35KV side is not grounded. The generation of ferromagnetic resonance requires that the system inductance and capacitance be coordinated within a certain parameter range. In addition, due to the impact of single-phase grounding short circuit, reclosing and other faults on the system, the voltage transformer is saturated in a short time, the excitation impedance is greatly reduced, and ferromagnetic resonance is stimulated.

[0140] 110KV / 35KV main transformer parameters, wiring method adopts YNyn0, rated voltage 110 / 38.5KV, rated capacity 31.5MVA, 110KV grade electricity three-phase voltage is:

[0141]

[0142] Where: θ0 is the initial phase angle of the power supply.

[0143] When a single-phase ground short circuit occurs, the current flowing through the fault point is capacitive current, and the non-fault phase voltage rises to the line voltage. When the fault disappears, the non-fault phase voltage returns to normal. At this time, the charge accumulated during the fault can only be released through the neutral point of the voltage transformer, causing the saturation of the voltage transformer and exciting ferromagnetic resonance when the parameters are matched.

[0144] The simulation uses single-phase grounding as the trigger condition to trigger ferromagnetic resonance. As the transmission distance increases, the capacitance value of the distribution system to the ground also increases. In this process, the distribution system will successively experience high-frequency resonance, fundamental frequency resonance, and frequency division resonance. The frequency division resonance and fundamental frequency resonance occur more frequently. The model is set to have a phase A grounding fault first, and then the fault disappears. The capacitance value to the ground is 0.002μF.

[0145] Depend on Figure 6 (a) It can be seen that after the single-phase grounding fault is eliminated, the system excites the fundamental frequency resonance. After the resonance occurs, it needs to pass through the detection device. After identifying that it meets the resonance conditions, it sends an action signal and puts the secondary detuning device into operation. In this case, at 0.24S, the damping resistor is put into operation for secondary detuning. The damping resistor is 1Ω. It can be seen from the figure that after the secondary detuning device is put into operation, the fundamental frequency resonance is significantly suppressed.

[0146] Depend on Figure 6(b) It can be seen that, relative to the same resonance type, after the primary detuning device is put into use, the resonance is eliminated at 0.31S. The primary detuning device used in this example is a linear resistor, and the detuning effect gradually becomes more obvious as the resistance value increases.

[0147] Depend on Figure 6 (c) It can be seen that when the Prony algorithm detects that the secondary detuning cannot eliminate the fundamental frequency resonance after the preset time, the primary detuning device is put into use. After a short period of oscillation, the fundamental frequency resonance is successfully eliminated, which verifies the usefulness of the method proposed in the present invention.

[0148] Compared with the fundamental frequency resonance, the overcurrent amplitude of the frequency division resonance is larger and is more likely to cause the voltage transformer to burn out. The following simulation analysis of the frequency division resonance is performed. The ground capacitance value is 0.02μF, the A phase grounding fault occurs at 0.065S, the fault is removed at 0.27S, and the resonance is identified at 0.31S and the secondary detuning device is put into use. The damping resistance is 1Ω. Figure 7 (a) It can be seen that after the secondary detuning device is put into use, the resonance is eliminated in a relatively short time.

[0149] Depend on Figure 7 (b) It can be seen that after the primary detuning is put into use, the primary detuning resistor consumes the resonant energy. After a short period of oscillation, the resonance is eliminated and the distribution system resumes normal operation. Regardless of the primary detuning or the secondary detuning, the detuning effect is mainly related to the detuning resistor. When the detuning resistor is not properly selected, the resonance cannot be eliminated in time.

[0150] Depend on Figure 7 (c) It can be seen that when the secondary detuning device cannot eliminate the frequency division resonance in time, the secondary detuning device is exited after a predetermined time and the primary detuning device is put into use, thereby avoiding the continuous impact of the resonant overvoltage on the system and eliminating the frequency division resonance in time and effectively.

[0151] Through the above modeling analysis and verification, the preset resistance of the secondary detuning device and the primary detuning device under each resonance type can be determined, and the ferromagnetic resonance can be accurately eliminated.

[0152] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0153] Based on the same inventive concept, the embodiment of the present application also provides a device for detuning the ferromagnetic resonance of a distribution network for implementing the detuning method of the ferromagnetic resonance of a distribution network involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in the embodiments of one or more devices for detuning the ferromagnetic resonance of a distribution network provided below can refer to the limitations of the detuning method of the ferromagnetic resonance of a distribution network above, and will not be repeated here.

[0154] In an exemplary embodiment, Figure 8 As shown, a detuning device for ferromagnetic resonance of a distribution network is provided, comprising: a voltage acquisition module 801, a parameter acquisition module 802, a secondary detuning module 803, a secondary acquisition module 804 and a primary detuning module 805, wherein:

[0155] The voltage acquisition module 801 is used to acquire sampled voltage data of the distribution network;

[0156] The parameter acquisition module 802 is used to input the sampled voltage data into the Proni model to obtain the parameter information of the voltage in the distribution network; the parameter information includes the voltage amplitude, frequency and attenuation factor;

[0157] The secondary detuning module 803 is used to use a preset secondary detuning device to perform detuning processing on the distribution network when it is detected that ferromagnetic resonance occurs in the distribution network according to the parameter information;

[0158] The secondary acquisition module 804 is used to reacquire the sampled voltage data of the distribution network after a preset time and obtain new parameter information;

[0159] The primary detuning module 805 is used to use a preset primary detuning device to perform detuning processing on the distribution network when it is detected that ferromagnetic resonance still occurs in the distribution network according to the new parameter information.

[0160] In one of the embodiments, the secondary detuning module 803 is further used to determine the resonance type of ferromagnetic resonance occurring in the distribution network according to parameter information; based on the resonance type, select a preset resistance value of a preset secondary detuning device; and according to the preset resistance value, use a preset secondary detuning device to perform detuning processing on the distribution network.

[0161] In one of the embodiments, the sampled voltage data includes sampled voltage data of the three-phase voltage; the parameter information includes parameter information of the three-phase voltage; the above-mentioned secondary harmonic elimination module 803 is also used to determine that the resonance type is fundamental frequency resonance when the frequency of the three-phase voltage is the fundamental frequency, the attenuation factor is not zero, and the amplitude meets the preset conditions; the preset conditions are that the amplitudes of the two-phase voltages are higher than the normal amplitude and the amplitude of the one-phase voltage is lower than the normal amplitude, or the amplitudes of the two-phase voltages are lower than the normal amplitude and the amplitude of the one-phase voltage is higher than the normal amplitude.

[0162] In one embodiment, the secondary detuning module 803 is further configured to determine that the resonance type is frequency division resonance when the amplitudes of the three-phase voltages are all higher than the normal amplitudes, the frequencies are lower than the fundamental frequency, and the attenuation factors are not zero.

[0163] In one embodiment, the secondary detuning module 803 is further used to determine that the resonance type is high-frequency resonance when the amplitudes of the three-phase voltages are all higher than the normal amplitudes, the attenuation factors are not zero, and the frequencies are multiples of the fundamental frequency.

[0164] In one of the embodiments, ferromagnetic resonance includes multiple resonant modes, and the parameter information includes parameter information of the multiple resonant modes; the above-mentioned distribution network ferromagnetic resonance detuning device also includes a target mode determination module, which is used to screen out the target resonant mode with the largest amplitude from the multiple resonant modes based on the parameter information of the multiple resonant modes.

[0165] In one of the embodiments, the secondary detuning module 803 is further configured to, when it is detected that ferromagnetic resonance occurs in the distribution network according to parameter information of the target resonant mode, perform detuning on the distribution network using a preset secondary detuning device.

[0166] Each module in the above-mentioned detuning device for ferromagnetic resonance of the power distribution network can be implemented in whole or in part by software, hardware and a combination thereof. Each of the above-mentioned modules can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute the operations corresponding to each of the above modules.

[0167] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Fig. 9As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface, the display unit and the input device are connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. When the computer program is executed by the processor, a method for detuning the ferromagnetic resonance of a distribution network is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0168] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0169] In one embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0170] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0171] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0172] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0173] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0174] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0175] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A method for eliminating ferromagnetic resonance in a distribution network, characterized in that: The method comprises: Obtain sampled voltage data of the distribution network; Inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage; When it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, a preset secondary detuning device is used to perform detuning processing on the distribution network; After a preset time, reacquire the sampled voltage data of the distribution network and obtain new parameter information; When it is detected according to the new parameter information that ferromagnetic resonance still occurs in the distribution network, a preset primary detuning device is used to perform detuning processing on the distribution network.

2. The method according to claim 1, characterized in that When it is detected according to the parameter information that the distribution network has ferromagnetic resonance, a preset secondary detuning device is used to perform detuning processing on the distribution network, including: Determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information; Based on the resonance type, selecting a preset resistance value of the preset secondary detuning device; According to the preset resistance value, the preset secondary detuning device is used to perform detuning processing on the distribution network.

3. The method according to claim 2, characterized in that The sampled voltage data includes sampled voltage data of three-phase voltage; the parameter information includes parameter information of three-phase voltage; The step of determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information includes: When the frequency of the three-phase voltage is the fundamental frequency, the attenuation factor is not zero, and the amplitude meets the preset conditions, the resonance type is determined to be the fundamental frequency resonance; the preset conditions are that the amplitudes of the two-phase voltages are higher than the normal amplitude and the amplitude of one-phase voltage is lower than the normal amplitude, or the amplitudes of the two-phase voltages are lower than the normal amplitude and the amplitude of one-phase voltage is higher than the normal amplitude.

4. The method according to claim 3, characterized in that The step of determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information includes: When the amplitudes of the three-phase voltages are all higher than the normal amplitudes, the frequencies are lower than the fundamental frequency, and the attenuation factors are not zero, it is determined that the resonance type is the frequency division resonance.

5. The method according to claim 3, characterized in that: The step of determining the resonance type of the ferromagnetic resonance occurring in the distribution network according to the parameter information includes: When the amplitudes of the three-phase voltages are all higher than normal amplitudes, the attenuation factor is not zero, and the frequency is a multiple of the fundamental frequency, it is determined that the resonance type is high-frequency resonance.

6. The method according to claim 1, characterized in that The ferromagnetic resonance includes a plurality of resonance modes, and the parameter information includes parameter information of the plurality of resonance modes; When it is detected according to the parameter information that the distribution network has ferromagnetic resonance, before using a preset secondary detuning device to perform detuning processing on the distribution network, the method further includes: According to the parameter information of the multiple resonance modes, a target resonance mode with the largest amplitude is selected from the multiple resonance modes; When it is detected according to the parameter information that the distribution network has ferromagnetic resonance, a preset secondary detuning device is used to perform detuning processing on the distribution network, including: When it is detected that ferromagnetic resonance occurs in the distribution network according to the parameter information of the target resonant mode, a preset secondary detuning device is used to perform detuning processing on the distribution network.

7. A detuning device for ferromagnetic resonance of a distribution network, characterized in that: The device comprises: A voltage acquisition module is used to obtain sampled voltage data of the distribution network; A parameter acquisition module, used for inputting the sampled voltage data into the Proni model to obtain parameter information of the voltage in the distribution network; the parameter information includes the amplitude, frequency and attenuation factor of the voltage; A secondary detuning module, configured to, when it is detected according to the parameter information that ferromagnetic resonance occurs in the distribution network, use a preset secondary detuning device to perform detuning processing on the distribution network; A secondary acquisition module, used to reacquire the sampled voltage data of the distribution network after a preset time and obtain new parameter information; The primary detuning module is used to use a preset primary detuning device to perform detuning processing on the distribution network when it is detected that ferromagnetic resonance still occurs in the distribution network according to the new parameter information.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 are implemented.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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