A ferroresonance identification method and device, computer equipment and storage medium

Abstract

The application relates to a ferromagnetic resonance identification method and device, computer equipment and a storage medium. The method comprises the following steps: obtaining a target bus measurement parameter corresponding to a target system bus in a power system, and obtaining a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter; in the case that the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; obtaining a second judgment result corresponding to the ferromagnetic element according to a linearity measurement parameter and the power measurement parameter in the target bus measurement parameter; in the case that the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element. The type of ferromagnetic resonance occurring after the system fault can be theoretically identified, and the accuracy of identifying the ferromagnetic resonance fault type is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and particularly relates to a ferroresonance identification method and device, computer equipment, a storage medium and a computer program product. BACKGROUND

[0002] With the development of power system technology, power safety detection technology appears. In order to monitor the bus voltage of a substation and provide protection, measurement and other voltage signals for a relay protection device, an electromagnetic voltage transformer with a star connection of a primary winding and a neutral point directly grounded is usually connected to the bus of the substation. Due to the nonlinear characteristics of the core inductance of the voltage transformer, under the disturbance of external voltage, the core is prone to saturation, resulting in a decrease in excitation inductance, which, together with the ground capacitance parameters of the medium-voltage distribution network, easily causes ferroresonance, resulting in overvoltage of the system.

[0003] Ferroresonance can be generally divided into sub-frequency resonance, fundamental frequency resonance and high-frequency resonance. Sub-frequency resonance and fundamental frequency resonance are more common in reality. When ferroresonance occurs in a system, it is often accompanied by an increase or decrease in voltage of one or more phases. The fundamental frequency resonance and a general single-phase grounding fault have similar characteristics. In the conventional technology, for the ferroresonance identification problem, the commonly used ferroresonance identification technologies mainly include a harmonic balance method, a graphical method, a description function method, a phase plane method and a wavelet transform analysis method. However, the above methods almost need manual measurement and calculation, and cannot accurately identify the ferroresonance fault type. SUMMARY

[0004] Therefore, it is necessary to provide a ferroresonance identification method and device, computer equipment, a computer readable storage medium and a computer program product capable of improving the accuracy of identifying the ferroresonance fault type.

[0005] In a first aspect, the application provides a ferroresonance identification method. The method comprises: obtaining target bus measurement parameters corresponding to a target system bus in a power system, and obtaining bus zero sequence voltage corresponding to the target system bus according to power measurement parameters in the target bus measurement parameters; in the case that the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferroresonance mode of the ferromagnetic element corresponding to the target system bus, and the ferroresonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance; obtaining a second judgment result corresponding to the ferromagnetic element according to linearity measurement parameters in the target bus measurement parameters and the power measurement parameters; the second judgment result is used to represent the ferroresonance mode of the ferromagnetic element corresponding to the target system bus; in the case that the ferroresonance mode represented by the first judgment result is the same as the ferroresonance mode represented by the second judgment result, the same ferroresonance mode is determined as a target ferroresonance mode corresponding to the ferromagnetic element.

[0006] In a second aspect, the application also provides a ferroresonance identification device. The device comprises: a bus zero sequence voltage obtaining module, configured to obtain target bus measurement parameters corresponding to a target system bus in a power system, and obtain bus zero sequence voltage corresponding to the target system bus according to power measurement parameters in the target bus measurement parameters; a first judgment result obtaining module, configured to, in the case that the target system bus has a fault, perform Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferroresonance mode of the ferromagnetic element corresponding to the target system bus, and the ferroresonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance; a second judgment result obtaining module, configured to obtain a second judgment result corresponding to the ferromagnetic element according to linearity measurement parameters in the target bus measurement parameters and the power measurement parameters; the second judgment result is used to represent the ferroresonance mode of the ferromagnetic element corresponding to the target system bus; a target ferroresonance mode determining module, configured to, in the case that the ferroresonance mode represented by the first judgment result is the same as the ferroresonance mode represented by the second judgment result, determine the same ferroresonance mode as a target ferroresonance mode corresponding to the ferromagnetic element.

[0007] In a third aspect, the present application also provides a computer device. The computer device comprises a memory and a processor. The memory stores a computer program. The processor implements the following steps when executing the computer program: obtaining a target bus measurement parameter corresponding to a target system bus in a power system, and obtaining a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter; in a case where the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of a sub-frequency resonance, a fundamental frequency resonance or a multiple frequency resonance; obtaining a second judgment result corresponding to the ferromagnetic element according to a linearity measurement parameter in the target bus measurement parameter and the power measurement parameter; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus; in a case where the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0008] In a fourth aspect, the present application also provides a computer readable storage medium. The computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the following steps: obtaining a target bus measurement parameter corresponding to a target system bus in a power system, and obtaining a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter; in a case where the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of a sub-frequency resonance, a fundamental frequency resonance or a multiple frequency resonance; obtaining a second judgment result corresponding to the ferromagnetic element according to a linearity measurement parameter in the target bus measurement parameter and the power measurement parameter; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus; in a case where the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0009] In a fifth aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the following steps: obtaining a target bus measurement parameter corresponding to a target system bus in a power system, and obtaining a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter; in the case where the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance; obtaining a second judgment result corresponding to the ferromagnetic element according to a line measurement parameter in the target bus measurement parameter and the power measurement parameter; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus; and in the case where the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0010] The ferromagnetic resonance identification method, device, computer device, storage medium and computer program product described above, by obtaining a target bus measurement parameter corresponding to a target system bus in a power system, and obtaining a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter; in the case where the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance; obtaining a second judgment result corresponding to the ferromagnetic element according to a line measurement parameter in the target bus measurement parameter and the power measurement parameter; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus; and in the case where the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0011] After the type of system line fault is determined by comparing and analyzing the peak values of the three-phase voltage recording data after system failure, the zero sequence voltage recording data after system failure is subjected to fast Fourier transform (FFT) spectrum analysis to preliminarily identify the ferromagnetic resonance mode generated after system failure; combined with a line-to-ground capacitance reactance X C0 and a system comprehensive inductance reactance X mThe calculation method is used for quantitatively analyzing the ferromagnetic resonance generation mechanism, and theoretically identifying the category of the ferromagnetic resonance after the system fault, so as to effectively improve the accuracy of identifying the fault type of the ferromagnetic resonance. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 An application environment diagram of a ferromagnetic resonance identification method in an embodiment;

[0013] Figure 2 A flowchart of a ferromagnetic resonance identification method in an embodiment;

[0014] Figure 3 A flowchart of a second judgment result obtaining method in an embodiment;

[0015] Figure 4 A flowchart of a ground capacitance reactance obtaining method in an embodiment;

[0016] Figure 5 A flowchart of a comprehensive inductance reactance obtaining method in an embodiment;

[0017] Figure 6 A flowchart of a second judgment result classification method in an embodiment;

[0018] Figure 7 A flowchart of a target system bus fault judgment method in an embodiment;

[0019] Figure 8 A zero sequence voltage Fourier transform spectrum diagram of a target system bus after a fault in an embodiment;

[0020] Figure 9 An implementation logic diagram of a ferromagnetic resonance identification in an embodiment;

[0021] Figure 10 A discrimination region diagram of a target system bus in different threshold values in an embodiment;

[0022] Figure 11 A structural block diagram of a ferromagnetic resonance identification device in an embodiment;

[0023] Figure 12 An internal structure diagram of a computer device in an embodiment. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application is further described in detail below in combination with the 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.

[0025] The ferromagnetic resonance identification method provided by the embodiment of the application can be applied to the application environment as shown in the figure. Figure 1 The terminal 102 communicates with the server 104 through a network. The data storage system can store data required to be processed by the server 104. The data storage system can be integrated on the server 104, or placed on a cloud or other network server. The server 104 obtains a target busbar measurement parameter corresponding to a target system busbar in a power system from the terminal 102, and obtains a busbar zero sequence voltage corresponding to the target system busbar according to a power measurement parameter in the target busbar measurement parameter. In the case that the target system busbar has a fault, the busbar zero sequence voltage is subjected to Fourier transform to obtain a first judgment result corresponding to a ferromagnetic element. The first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system busbar, and the ferromagnetic resonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance. A second judgment result corresponding to the ferromagnetic element is obtained according to a linearity measurement parameter in the target busbar measurement parameter and the power measurement parameter. The second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system busbar. In the case that the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode of the ferromagnetic element. The terminal 102 can be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, Internet of Things devices and portable wearable devices. The Internet of Things device can be a smart speaker, a smart television, a smart air conditioner, a smart vehicle-mounted device, etc. The portable wearable device can be a smart watch, a smart bracelet, a head-mounted device, etc. The server 104 can be implemented by an independent server or a server cluster composed of multiple servers.

[0026] In one embodiment, as shown in the figure, Figure 2 A ferromagnetic resonance identification method is provided. The method is applied to the server in the figure Figure 1 for example, and includes the following steps:

[0027] In step 202, a target busbar measurement parameter corresponding to a target system busbar in a power system is obtained, and a busbar zero sequence voltage corresponding to the target system busbar is obtained according to a power measurement parameter in the target busbar measurement parameter.

[0028] The target system busbar can be an intermediate link in voltage distribution devices at various levels, and its function is to collect, distribute and transmit electric energy. It is mainly used for the connection of the electrical main circuit between the generator outlet of the power plant, the main transformer, the auxiliary transformer and the distribution box. The target system busbar is divided into two categories: bare busbar and enclosed busbar.

[0029] The target bus measurement parameter can be a value reflecting the specific state of the target system bus, which can be an objectively existing value (height above ground, bus length, etc.), or a value that changes due to the operation of the power system (voltage, current, etc.). Generally, the target bus measurement parameter is divided into power measurement parameters and line measurement parameters.

[0030] The power measurement parameter can be a parameter used to reflect the electrical measurement value in the target bus system, and for the target system bus, generally includes power frequency angle frequency, ground line coefficient, primary side voltage, and excitation current, etc.

[0031] The bus zero sequence voltage can be the neutral line-to-ground voltage generated when one or two phases of the three-phase line of the target measurement bus are grounded. When a ground fault occurs in a neutral point direct grounding system (also known as a large ground current system), a large zero sequence voltage will occur. In a neutral point non-direct grounding system, when a single-phase grounding occurs, a zero sequence voltage will also be generated.

[0032] Specifically, the server responds to the instructions of the terminal, obtains the target bus measurement parameter corresponding to the target system bus from the terminal, and stores the obtained target bus measurement parameter in the storage unit. When the server needs to process any data record in the target bus measurement parameter, it is retrieved from the storage unit to the volatile storage resource for calculation by the central processing unit. Any data record can be a single data input to the central processing unit, or multiple data input to the central processing unit at the same time.

[0033] According to the three-phase voltage value of the target system bus represented by the power measurement parameter in the target bus measurement parameter By the positive sequence component method, the bus zero sequence voltage corresponding to the target system bus is obtained Wherein, for the target system bus, U a , U b , U c , U0 are the effective value.

[0034] Step 204, in the case of a fault in the target system bus, Fourier transform is performed on the bus zero sequence voltage to obtain a first judgment result corresponding to the ferromagnetic element.

[0035] The first judgment result can be a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, which includes one of frequency division resonance, fundamental frequency resonance, or frequency multiplication resonance.

[0036] Specifically, the bus three-phase voltage of the target system bus before and after the fault The recording data (i.e. bus three-phase voltage recording data) is analyzed. In the first step, according to the bus three-phase voltage recording data and the voltage fault time corresponding to the target system bus, the voltage peak average value corresponding to the continuous N voltage peaks before the three-phase voltage fault is collected Wherein i represents the voltage phase, and the system normal operation before the fault is A constant value; in the second step, at least two continuous voltage peaks U in Wherein n is the nth peak (1≤n≤N) of the continuous N voltage peaks. Through the voltage peak comparison method, the following relationship is obtained:

[0037]

[0038] Wherein, in The ratio of the i-phase voltage peak of the target system bus after the voltage fault time fault to the i-phase voltage peak average value of the target system bus before the voltage fault time fault, and n The sum of the ratios of the voltage peaks of the target system bus after the voltage fault time fault to the voltage peak average values of the target system bus before the voltage fault time fault.

[0039] If n Is greater than the preset threshold and in One of them is less than 1, then the fault type of the target system bus is single-phase ground short circuit.

[0040] In the case that the target system bus exists fault, the bus zero sequence voltage corresponding to the target system bus is subjected to fast Fourier transform (FFT), the FFT frequency spectrum signal amplitude of the zero sequence voltage is obtained, and the first judgment result corresponding to the ferromagnetic element is further obtained according to the FFT frequency spectrum signal amplitude of the zero sequence voltage. Wherein, Figure 8 The zero sequence voltage Fourier transform frequency spectrum diagram after the target system bus fault; wherein, if the FFT frequency spectrum signal amplitude of the zero sequence voltage is mainly distributed less than 50, the first judgment result is to determine that the ferromagnetic element occurs frequency division resonance, if the FFT frequency spectrum signal amplitude of the zero sequence voltage is mainly distributed greater than 50, the first judgment result is to determine that the ferromagnetic element occurs frequency multiplication resonance; if the FFT frequency spectrum signal amplitude of the zero sequence voltage is mainly distributed at 50, the first judgment result is to determine that the ferromagnetic element occurs fundamental frequency resonance.

[0041] In step 206, the second judgment result corresponding to the ferromagnetic element is obtained according to the linearity measurement parameter in the target bus measurement parameter and the power measurement parameter.

[0042] Wherein, the linearity measurement parameter can be a parameter of the measurement value of the length, area and volume in the target bus system, and for the target system bus, generally includes line length (km), line height (m) and the like.

[0043] The second judgment result can be a ferromagnetic resonance mode of a ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of a sub-frequency resonance, a fundamental frequency resonance or a multiple frequency resonance.

[0044] Specifically, the first step: in the case that the target system bus has a fault and the ferromagnetic resonance mode represented by the first judgment result has been determined, the linearity measurement parameter (line length) L and the ground line coefficient of the power measurement parameter of the target system bus are extracted, and the linearity measurement parameter, the ground line coefficient and the frequency capacitance characteristic coefficient are multiplied to obtain the frequency capacitance characteristic corresponding to the target system bus, and the expression is:

[0045]

[0046] Wherein, ω is the power frequency angular frequency, C is the per-phase capacitance value of the overhead line, δ is the ground line coefficient with or without overhead line: δ = 3.3 with overhead ground line, δ = 2.7 without overhead ground line, L is the line length (km).

[0047] The frequency capacitance characteristic coefficient can be calculated by conversion according to the calculation method of the ground capacitance current of the target system bus.

[0048] The total three-phase-to-ground capacitance current calculation relationship of the overhead line is:

[0049] I C = 1.1 x δU n L / 10 3

[0050] Wherein, I C is the total three-phase-to-ground capacitance current of the overhead line; U n is the rated voltage of the target system bus, unit: kv; the coefficient 1.1 is the 10% increase of the tower and the concrete pole.

[0051] The relationship between the total three-phase-to-ground capacitance current and the per-phase capacitance value C of the overhead line is:

[0052]

[0053] Wherein, δ is the angular frequency under the power frequency, and C is the per-phase capacitance value of the overhead line.

[0054] Further, the reciprocal of the frequency capacitance characteristic corresponding to the target system bus is calculated, that is, the ground capacitance reactance X C0 corresponding to the target system bus is obtained, and the expression is:

[0055] X C0 = 1 / (ωC)

[0056] Second step: in the case that the target system busbar exists a fault and the ferromagnetic resonance mode represented by the first judgment result has been determined, the primary side voltage corresponding to the voltage transformer in the power measurement parameter and the field current are extracted, and the primary side voltage is multiplied by the field current, so that the field impedance corresponding to the target system busbar is obtained.

[0057] At the same time, the power frequency angle frequency in the power measurement parameter is extracted, and the power frequency angle frequency is multiplied by the line measurement parameter, so that the frequency length characteristic corresponding to the target system busbar is obtained.

[0058] The value of the field impedance corresponding to the target system busbar is compared with the value of the frequency length characteristic, if the values of the two are consistent, the value of the field impedance or the value of the frequency length characteristic is taken as the comprehensive inductance reactance; if the values of the two are not consistent, the target busbar measurement parameter to be calculated is updated by returning to execute "obtaining the target busbar measurement parameter corresponding to the target system busbar in the power system" again. The calculation formula of the comprehensive inductance reactance X m is as follows:

[0059] X m = L = U / I L

[0060] Wherein, U is the voltage applied to the corresponding primary side of the voltage transformer, I L is the field current.

[0061] Third step: the ratio X C0 / m of the ground capacitance reactance X C0 of the target system busbar to the comprehensive inductance reactance X m of the voltage transformer is calculated. C0 / m Different ferromagnetic resonance modes occur in different threshold ranges. That is, according to the actual business requirements of the power system, it is determined that the ferromagnetic resonance mode of the ferromagnetic element in the case that the ratio X C0 / m of the ground capacitance reactance X C0 to the comprehensive inductance reactance X m falls within the range greater than 0.01 and less than 0.07 is frequency division resonance, and the second judgment result is obtained; or, it is determined that the ferromagnetic resonance mode of the ferromagnetic element in the case that the ratio X C0 / m of the ground capacitance reactance X C0 to the comprehensive inductance reactance X m falls within the range greater than 0.07 and less than 0.55 is fundamental frequency resonance, and the second judgment result is obtained; or, it is determined that the ferromagnetic resonance mode of the ferromagnetic element in the case that the ratio X C0The ratio X of the comprehensive inductance reactance X m C0 / m If the ratio X falls in the range of greater than 0.55 and less than 2.8, the ferromagnetic resonance mode of the ferromagnetic element in this case is frequency multiplication resonance, and a second determination result is obtained. If the ratio X C0 / m If the ratio X does not fall in the threshold range, the ferromagnetic element does not occur ferromagnetic resonance.

[0062] Step 208, in the case where the ferromagnetic resonance mode represented by the first determination result is the same as the ferromagnetic resonance mode represented by the second determination result, the same ferromagnetic resonance mode is determined as the target ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0063] The ferromagnetic resonance mode can be the type of ferromagnetic resonance generated by the ferromagnetic element in the case where the target system busbar fails.

[0064] The target ferromagnetic resonance mode can be the output result corresponding to the case where the first determination result and the second determination result represent the same ferromagnetic resonance mode.

[0065] Specifically, if the ferromagnetic resonance mode represented by the first determination result is the same as the ferromagnetic resonance mode represented by the second determination result, it is determined that the ferromagnetic element has occurred ferromagnetic resonance, and the ferromagnetic resonance mode represented by the first determination result or the ferromagnetic resonance mode represented by the second determination result is taken as the target ferromagnetic resonance mode corresponding to the ferromagnetic element. If the ferromagnetic resonance mode represented by the first determination result is not the same as the ferromagnetic resonance mode represented by the second determination result, return to perform “Fourier transform on the bus zero sequence voltage to obtain the first determination result corresponding to the ferromagnetic element”; further, if the number of times of returning to perform “Fourier transform on the bus zero sequence voltage to obtain the first determination result corresponding to the ferromagnetic element” exceeds 3 times, return to perform “obtain the target bus measurement parameter corresponding to the target system busbar in the power system”. For a ferromagnetic resonance identification method, Figure 9 The implementation logic diagram of the method.

[0066] ​In the above ferromagnetic resonance identification method, a target bus measurement parameter corresponding to a target system bus in a power system is obtained, and a bus zero sequence voltage corresponding to the target system bus is obtained according to a power measurement parameter in the target bus measurement parameter; in the case that the target system bus has a fault, a Fourier transform is performed on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance; a second judgment result corresponding to the ferromagnetic element is obtained according to a linearity measurement parameter and the power measurement parameter in the target bus measurement parameter; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus; in the case that the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0067] After the type of system line fault is determined by comparing and analyzing the peak values of the three-phase voltage recording data after system failure, the zero sequence voltage recording data after system failure is subjected to fast Fourier transform (FFT) spectrum analysis to preliminarily identify the ferromagnetic resonance mode generated after system failure; combined with a calculation method of line-to-ground capacitance reactance X C0 and system comprehensive inductance reactance X m , the ferromagnetic resonance generation mechanism is quantitatively analyzed to theoretically identify the type of ferromagnetic resonance generated after system failure, which can effectively improve the accuracy of identifying the type of ferromagnetic resonance fault.

[0068] In one embodiment, as shown in Figure 3 , the second judgment result corresponding to the ferromagnetic element is obtained according to the linearity measurement parameter and the power measurement parameter in the target bus measurement parameter, including:

[0069] In step 302, the linearity measurement parameter and the power measurement parameter in the target bus measurement parameter are used to obtain the line-to-ground capacitance reactance corresponding to the target system bus.

[0070] The line-to-ground capacitance reactance can be the reactance generated by the capacitance existing between the transmission line and the distribution line and the ground; the capacitance also exists between the three-phase conductors, so the reactance also exists.

[0071] Specifically, in the case that the target system bus has a fault and the ferromagnetic resonance mode represented by the first judgment result has been determined, the linearity measurement parameter (line length) L and the ground line coefficient of the power measurement parameter of the target system bus are extracted, and the linearity measurement parameter, the ground line coefficient and the frequency capacitance characteristic coefficient are multiplied to obtain the frequency capacitance characteristic corresponding to the target system bus, and the expression is:

[0072]

[0073] Wherein, ω is the angular frequency of the power frequency, C is the per-phase capacitance value of the overhead line, δ is the ground wire coefficient with or without overhead: with overhead ground wire δ = 3.3, without overhead ground wire δ = 2.7, L is the line length (km).

[0074] Wherein, the frequency capacitance characteristic coefficient can be calculated by conversion according to the calculation method of the target system busbar-to-ground capacitance current to obtain the frequency capacitance characteristic coefficient of the target system busbar.

[0075] According to the total three-phase-to-ground capacitance current calculation relationship of the overhead line:

[0076] I C = 1.1 x δU n L / 10 3

[0077] Wherein, I C is the total three-phase-to-ground capacitance current of the overhead line; U n is the rated voltage of the target system busbar, unit kv; the coefficient 1.1 is the 10% increase of the tower and the cement pole.

[0078] The relationship between the total three-phase-to-ground capacitance current and the per-phase capacitance value C of the overhead line is:

[0079]

[0080] Wherein, ω is the angular frequency under the power frequency, C is the per-phase capacitance value of the overhead line.

[0081] Further, the reciprocal of the frequency capacitance characteristic corresponding to the target system busbar is calculated, that is, the ground capacitance reactance X C0 corresponding to the target system busbar is obtained, and the expression is:

[0082] X C0 = 1 / (ωC)

[0083] Step 304, according to the linearity measurement parameter and the power measurement parameter in the target busbar measurement parameter, the comprehensive inductance reactance corresponding to the target system busbar is obtained.

[0084] Wherein, the comprehensive inductance reactance can be the AC passing through the target system busbar, but due to the inductance of each coil in the target system busbar, the inductance has a hindering effect on the AC. Experiments show that the reactance and inductance are proportional, and the frequency is also proportional.

[0085] Specifically, in the case that the target system bus exists a fault and the ferromagnetic resonance mode represented by the first judgment result has been determined, the primary side voltage corresponding to the voltage transformer in the power measurement parameter and the field current are extracted, and the primary side voltage is multiplied by the field current, so as to obtain the field impedance corresponding to the target system bus.

[0086] Meanwhile, the power frequency angle frequency in the power measurement parameter is extracted, and the power frequency angle frequency is multiplied by the line measurement parameter, so as to obtain the frequency length characteristic corresponding to the target system bus.

[0087] The value of the field impedance corresponding to the target system bus is compared with the value of the frequency length characteristic. If the values of the two are consistent, the value of the field impedance or the value of the frequency length characteristic is taken as the comprehensive inductance reactance; if the values of the two are not consistent, the target bus measurement parameter to be calculated is updated by returning to execute the step of obtaining the target bus measurement parameter corresponding to the target system bus in the power system. The calculation formula of the comprehensive inductance reactance X m is as follows:

[0088] X m = U / I L

[0089] wherein U is the voltage applied to the corresponding primary side of the voltage transformer, and I L is the field current.

[0090] In step 306, the second judgment result corresponding to the ferromagnetic element is obtained according to the ground capacitance reactance and the comprehensive inductance reactance.

[0091] Specifically, the ratio X C0 / m of the ground capacitance reactance X C0 of the target system bus to the comprehensive inductance reactance X m of the voltage transformer is calculated. C0 / m Different ferromagnetic resonance modes occur in different threshold ranges. That is, according to the actual business requirements of the power system, it is determined that the ferromagnetic resonance mode of the ferromagnetic element occurring in the case that the ratio X C0 / m of the ground capacitance reactance X C0 to the comprehensive inductance reactance X m falls within the range greater than 0.01 and less than 0.07 is frequency division resonance, and the second judgment result is obtained; or it is determined that the ferromagnetic resonance mode of the ferromagnetic element occurring in the case that the ratio X C0 / m of the ground capacitance reactance X C0 to the comprehensive inductance reactance X mThe ferromagnetic resonance mode of the ferromagnetic element in this case where X falls in the range greater than 0.07 and less than 0.55 is fundamental frequency resonance, obtaining a second determination result; or, determining the ground capacitance reactance X C0 and the ratio X m of the comprehensive inductance reactance C0 / m The ferromagnetic resonance mode of the ferromagnetic element in this case where X falls in the range greater than 0.55 and less than 2.8 is frequency doubling resonance, obtaining a second determination result. If X C0 / m does not fall in the threshold range, the ferromagnetic element does not have ferromagnetic resonance.

[0092] In this embodiment, by calculating the ground capacitance reactance corresponding to the target system bus and the comprehensive inductance reactance, and determining the ferromagnetic resonance mode of the ferromagnetic element by using the quotient of the two, the ferromagnetic resonance mode of the ferromagnetic element can be further determined in different ways, and the error rate of the ferromagnetic resonance mode of the ferromagnetic element is reduced.

[0093] In one embodiment, as shown in Figure 4 , the ground capacitance reactance corresponding to the target system bus is obtained according to the linearity measurement parameter and the power measurement parameter in the target bus measurement parameter, including:

[0094] Step 402, obtaining the frequency capacitance characteristic corresponding to the target system bus according to the ground wire coefficient and the linearity measurement parameter.

[0095] The ground wire coefficient can be a ratio coefficient for ensuring the safe operation of the overhead transmission line. Generally, the design safety coefficient of the conductor should not be less than 2.5 according to the regulations, and considering that the ground wire is usually made of steel strand which is easy to corrode, the design safety coefficient thereof should be greater than the design safety coefficient of the conductor.

[0096] The frequency capacitance characteristic can be a characteristic value composed of frequency and capacitance, which is used to represent the product of the linearity measurement parameter and the ground wire coefficient.

[0097] Specifically, in the case where the target system bus has a fault and the ferromagnetic resonance mode represented by the first determination result has been determined, the linearity measurement parameter (line length) L and the ground wire coefficient of the power measurement parameter of the target system bus are extracted, and the linearity measurement parameter, the ground wire coefficient and the frequency capacitance characteristic coefficient are multiplied to obtain the frequency capacitance characteristic corresponding to the target system bus, and the expression is:

[0098]

[0099] Wherein, ω is the angular frequency of the power frequency, C is the per-phase capacitance value of the overhead line, δ is the ground wire coefficient with or without overhead line: δ = 3.3 with overhead ground wire, δ = 2.7 without overhead ground wire, and L is the line length (km).

[0100] Wherein, the frequency capacitance characteristic coefficient can be calculated by conversion according to the calculation method of the target system busbar-to-ground capacitance current to obtain the frequency capacitance characteristic coefficient of the target system busbar.

[0101] According to the total three-phase-to-ground capacitance current calculation relationship of the overhead line:

[0102] I C = 1.1 x δU n L / 10 3

[0103] Wherein, I C is the total three-phase-to-ground capacitance current of the overhead line; U n is the rated voltage of the target system busbar, unit: kv; and the coefficient 1.1 is the 10% increase of the tower and the cement pole.

[0104] The relationship between the total three-phase-to-ground capacitance current and the per-phase capacitance value C of the overhead line is:

[0105]

[0106] Wherein, ω is the angular frequency under the power frequency, and C is the per-phase capacitance value of the overhead line.

[0107] Step 404, calculate the reciprocal of the frequency capacitance characteristic to obtain the corresponding ground capacitance reactance of the target system busbar.

[0108] Specifically, the reciprocal of the frequency capacitance characteristic corresponding to the target system busbar is calculated, that is, the ground capacitance reactance X C0 corresponding to the target system busbar is obtained, and the expression is:

[0109] X C0 = 1 / (ωC)

[0110] In this embodiment, by using the ground wire parameters and the line measurement parameters, the parameters of the target system busbar are considered for the calculation of the ground capacitance reactance, which can consider the factors affecting the ferromagnetic resonance corresponding to the target system busbar, improve the accuracy of calculating the ground capacitance reactance, and further improve the accuracy of determining the ferromagnetic resonance mode corresponding to the ferromagnetic element.

[0111] In one embodiment, as Figure 5 shown, according to the line measurement parameter and the power measurement parameter in the target busbar measurement parameter, the comprehensive inductance reactance corresponding to the target system busbar is obtained, including:

[0112] In step 502, the excitation impedance corresponding to the target system bus is obtained according to the primary side voltage and the excitation current.

[0113] The primary side voltage can be the input voltage corresponding to the input end of the voltage transformer.

[0114] The excitation current can be the current corresponding to the working magnetic field generated by the voltage transformer.

[0115] The excitation impedance can be the voltage of the primary coil divided by the excitation current when the voltage transformer is in no-load state. The excitation impedance includes two components, the active component of resistance and the reactive component of reactance.

[0116] Specifically, in the case where the target system bus has a fault and the ferroresonance mode represented by the first determination result has been determined, the primary side voltage and the excitation current corresponding to the voltage transformer in the power measurement parameters are extracted, and the primary side voltage and the excitation current are multiplied to obtain the excitation impedance corresponding to the target system bus.

[0117] In step 504, the frequency length characteristic corresponding to the target system bus is obtained according to the power frequency angular frequency and the line measurement parameter.

[0118] The power frequency angular frequency can be the circular frequency at the power frequency, indicating the change of the phase angle in radians per unit time. The angular frequency is a physical quantity that describes the speed of a cycle.

[0119] The frequency length characteristic can be a characteristic value composed of the frequency and the line measurement parameter, used to represent the product of the primary side voltage and the excitation current.

[0120] Specifically, the power frequency angular frequency and the line measurement parameter in the power measurement parameters are extracted, and the power frequency angular frequency and the line measurement parameter are multiplied to obtain the frequency length characteristic corresponding to the target system bus.

[0121] In step 506, the comprehensive inductance reactance corresponding to the target system bus is obtained when the value of the excitation impedance and the value of the frequency length characteristic are consistent.

[0122] Specifically, the value of the excitation impedance corresponding to the target system bus and the value of the frequency length characteristic are compared. If the values of the two are consistent, the value of the excitation impedance or the value of the frequency length characteristic is taken as the comprehensive inductance reactance. If the values of the two are not consistent, the target bus measurement parameter to be calculated is updated by returning to execute the step of obtaining the target bus measurement parameter corresponding to the target system bus in the power system. m The calculation formula of the comprehensive inductance reactance X

[0123] Xm = L = U / I L

[0124] wherein U is the voltage applied to the primary side of the voltage transformer corresponding to the voltage transformer, I L is the field current.

[0125] In this embodiment, by using the primary side voltage and the field current, the calculation of the comprehensive inductive reactance considering the parameters of the target system bus can take into account the factors affecting the ferromagnetic resonance of the target system bus, improve the accuracy of calculating the comprehensive inductive reactance, and further improve the accuracy of determining the ferromagnetic resonance mode of the ferromagnetic element.

[0126] In one embodiment, as Figure 6 indicated, according to the ground capacitance reactance and the comprehensive inductive reactance, a second determination result corresponding to the ferromagnetic element is obtained, including:

[0127] Step 602, in the case that the quotient of the ground capacitance reactance and the comprehensive inductive reactance is greater than 0.01 and less than 0.07, a second determination result corresponding to the ferromagnetic element is obtained.

[0128] Specifically, it is determined that the ratio X C0 / m of the ground capacitance reactance X C0 and the comprehensive inductive reactance X m falls into the case that it is greater than 0.01 and less than 0.07, and the ferromagnetic resonance mode of the ferromagnetic element occurring in this case is frequency division resonance, and the second determination result is obtained.

[0129] Step 604, in the case that the quotient of the ground capacitance reactance and the comprehensive inductive reactance is greater than 0.07 and less than 0.55, a second determination result corresponding to the ferromagnetic element is obtained.

[0130] Specifically, it is determined that the ratio X C0 / m of the ground capacitance reactance X C0 and the comprehensive inductive reactance X m falls into the case that it is greater than 0.07 and less than 0.55, and the ferromagnetic resonance mode of the ferromagnetic element occurring in this case is fundamental frequency resonance, and the second determination result is obtained.

[0131] Step 606, in the case that the quotient of the ground capacitance reactance and the comprehensive inductive reactance is greater than 0.55 and less than 2.8, a second determination result corresponding to the ferromagnetic element is obtained.

[0132] Specifically, it is determined that the ratio X C0 / m of the ground capacitance reactance X C0 and the comprehensive inductive reactance X mThe ferromagnetic resonance mode of the ferromagnetic element falling within the range of greater than 0.55 and less than 2.8 is a harmonic resonance, leading to the second judgment result. Among these, Figure 10 This is a schematic diagram of the discrimination region where the target system busbar exhibits ferromagnetic resonance within different threshold values.

[0133] In this embodiment, by setting different thresholds for the quotient of the capacitance reactance to ground and the overall inductive reactance and their corresponding relationships with the ferromagnetic resonance modes, the ferromagnetic resonance modes possessed by the ferromagnetic element can be further subdivided, thereby improving the accuracy of the second judgment result for the ferromagnetic element.

[0134] In one embodiment, such as Figure 7 As shown, after obtaining the zero-sequence voltage of the target system bus based on the power measurement parameters in the target bus measurement parameters, the method further includes:

[0135] Step 702: Obtain the bus three-phase voltage waveform data corresponding to the target system bus.

[0136] Among them, the bus three-phase voltage waveform data can be used in the analysis of bus three-phase voltage faults to analyze the type of power system fault, analyze and judge the correctness of the action behavior of protection devices, the correctness of secondary circuits, and whether the polarity of CT and PT is correct, etc.

[0137] Specifically, obtain the three-phase bus voltages corresponding to the target system bus before and after the fault. The recorded waveform data (i.e., bus three-phase voltage waveform data) is obtained by collecting data from at least two AC cycles.

[0138] Step 704: Based on the bus three-phase voltage recording data and the voltage fault time corresponding to the target system bus, obtain the average voltage peak value before the voltage fault time, and obtain at least two consecutive voltage peak values ​​after the voltage fault time.

[0139] Among them, the voltage fault time can be the moment when any one or more components in the target system bus fail.

[0140] The average voltage peak value can be the voltage value obtained by averaging multiple voltage peak values ​​before the time of the target system bus failure.

[0141] Among them, continuous voltage peaks can be at least two uninterrupted voltage peaks after the moment when the target system bus fails, and can be either peaks or troughs.

[0142] Specifically, the first step is to collect the average value of N voltage peak values before the three-phase voltage fault according to the bus three-phase voltage recording data and the voltage fault time corresponding to the target system bus where i represents the voltage phase, and the normal operation of the system before the fault is a constant value; the second step is to collect at least two consecutive voltage peak values U in where n is the nth peak value (1≤n≤N) of the consecutive N voltage peak values.

[0143] Step 706, according to the voltage peak value and the continuous voltage peak value, the ratio of the average value of the peak value corresponding to the target system bus and the sum of the average value of the peak value are obtained.

[0144] Wherein, the ratio of the average value of the peak value can be the ratio between the voltage peak value of a certain phase after the fault of the target system bus and the average value of the voltage peak value of a certain phase before the fault of the target system bus.

[0145] Wherein, the sum of the average value of the peak value can be the sum of the ratio between the voltage peak value of each phase after the fault of the target system bus and the average value of the voltage peak value of each phase before the fault of the target system bus.

[0146] Specifically, based on the average value of the voltage peak value and the continuous voltage peak value, the voltage peak value comparison method has the following relationship:

[0147]

[0148] Wherein, ρ in is the ratio between the i-phase voltage peak value of the target system bus after the fault at the voltage fault time and the average value of the i-phase voltage peak value of the target system bus before the fault at the voltage fault time, and ρ n is the sum of the ratio between the voltage peak value of each phase of the target system bus after the fault at the voltage fault time and the average value of the voltage peak value of each phase of the target system bus before the fault at the voltage fault time.

[0149] Step 708, according to the ratio of the average value of the peak value and the sum of the average value of the peak value, whether the target system bus has a fault is judged.

[0150] Specifically, if the sum of the average value of the peak value ρ n is greater than the preset threshold, and the ratio of the average value of the voltage peak value ρ in has one phase less than 1, then the fault type of the target system bus is single-phase ground short circuit; if the sum of the average value of the peak value ρ n and the ratio of the average value of the voltage peak value ρ in does not satisfy the above conditions, it is determined that the target system bus has no fault, and then the execution of the ferroresonance identification is terminated.

[0151] In this embodiment, whether the target system bus is faulty is determined through the above steps, the data corresponding to the target system bus with faults is continuously executed for ferroresonance identification, and the data corresponding to the target system bus without faults is terminated, so that computer resources can be saved and the efficiency of executing the ferroresonance identification task can be improved.

[0152] It should be understood that, although each step in the flowchart involved in each of the above embodiments is shown in sequence according to the arrow, these steps are not necessarily executed in the order indicated by the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each of the above embodiments can include multiple steps or stages, which 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 sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0153] Based on the same inventive concept, the embodiments of the present application also provide a ferroresonance identification device for implementing the above-mentioned ferroresonance identification method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more ferroresonance identification device embodiments provided below can refer to the limitations of a ferroresonance identification method in the above, which will not be repeated here.

[0154] In one embodiment, as shown in Figure 11 A ferroresonance identification device is provided, including: a bus zero sequence voltage obtaining module 1102, a first judgment result obtaining module 1104, a second judgment result obtaining module 1106, and a target ferroresonance mode determining module 1108, wherein:

[0155] The bus zero sequence voltage obtaining module 1102 is configured to obtain a target bus measurement parameter corresponding to a target system bus in a power system, and obtain a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter.

[0156] The first judgment result obtaining module 1104 is configured to, in a case where the target system bus has a fault, perform Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferroresonance mode of the ferromagnetic element corresponding to the target system bus, and the ferroresonance mode includes one of frequency division resonance, fundamental frequency resonance, or frequency multiplication resonance.

[0157] The second judgment result obtaining module 1106 is configured to obtain a second judgment result corresponding to the ferromagnetic element according to the linearity measurement parameter and the power measurement parameter in the target bus measurement parameter; and the second judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus.

[0158] The target ferromagnetic resonance mode determining module 1108 is configured to determine the same ferromagnetic resonance mode as the target ferromagnetic resonance mode of the ferromagnetic element in a case where the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result.

[0159] In one embodiment, the second judgment result obtaining module 1106 is further configured to obtain a ground capacitance reactance corresponding to the target system bus according to the linearity measurement parameter and the power measurement parameter in the target bus measurement parameter; obtain a comprehensive inductance reactance corresponding to the target system bus according to the linearity measurement parameter and the power measurement parameter in the target bus measurement parameter; and obtain the second judgment result corresponding to the ferromagnetic element according to the ground capacitance reactance and the comprehensive inductance reactance.

[0160] In one embodiment, the second judgment result obtaining module 1106 is further configured to obtain a frequency capacitance characteristic corresponding to the target system bus according to the ground line coefficient and the linearity measurement parameter; and obtain the ground capacitance reactance corresponding to the target system bus by calculating the reciprocal of the frequency capacitance characteristic.

[0161] In one embodiment, the second judgment result obtaining module 1106 is further configured to obtain an excitation impedance corresponding to the target system bus according to the primary side voltage and the excitation current; obtain a frequency length characteristic corresponding to the target system bus according to the power frequency angular frequency and the linearity measurement parameter; and obtain the comprehensive inductance reactance corresponding to the target system bus in a case where the value of the excitation impedance is consistent with the value of the frequency length characteristic.

[0162] In one embodiment, the second judgment result obtaining module 1106 is further configured to obtain the second judgment result corresponding to the ferromagnetic element in a case where the quotient of the ground capacitance reactance and the comprehensive inductance reactance is greater than 0.01 and less than 0.07, the second judgment result being a sub-frequency resonance; obtain the second judgment result corresponding to the ferromagnetic element in a case where the quotient of the ground capacitance reactance and the comprehensive inductance reactance is greater than 0.07 and less than 0.55, the second judgment result being a fundamental frequency resonance; and obtain the second judgment result corresponding to the ferromagnetic element in a case where the quotient of the ground capacitance reactance and the comprehensive inductance reactance is greater than 0.55 and less than 2.8, the second judgment result being a multiple frequency resonance.

[0163] In one embodiment, the bus zero sequence voltage obtaining module 1102 is also configured to obtain bus three-phase voltage recording data corresponding to the target system bus; the bus three-phase voltage recording data is obtained by collecting data of at least two alternating current periods; according to the bus three-phase voltage recording data and the voltage fault time corresponding to the target system bus, a voltage peak average value before the voltage fault time is obtained, and at least two continuous voltage peaks after the voltage fault time are obtained; according to the voltage peak average value and the continuous voltage peaks, a peak average value ratio corresponding to the target system bus and a sum of the average value ratios are obtained; and according to the peak average value ratio and the sum of the average value ratios, it is determined whether the target system bus has a fault.

[0164] The above-mentioned modules in the ferroresonance identification device can be realized by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules.

[0165] In one embodiment, a computer device is provided, which can be a server, and an internal structure diagram of the computer device can be as shown in FIG. 8. Figure 12 The computer device includes a processor, a memory, and a network interface connected through a system bus. The processor of the computer device is configured 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, a computer program, and a database. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The database of the computer device is configured to store server data. The network interface of the computer device is configured to communicate with an external terminal through a network connection. The computer program is executed by the processor to implement a ferroresonance identification method.

[0166] Those skilled in the art can understand that Figure 12 The structure shown in FIG. 8 is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied. Specifically, the computer device can include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0167] In one embodiment, a computer device is also provided, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steps in the above-mentioned method embodiments.

[0168] In an embodiment, a computer readable storage medium storing a computer program is provided, the computer program, when executed by a processor, implements the steps in the above method embodiments.

[0169] In an embodiment, a computer program product or computer program is provided, the computer program product or computer program comprising computer instructions stored in a computer readable storage medium. A processor of a computer device reads the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the steps in the above method embodiments.

[0170] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in the present application are all information and data authorized by the user or authorized by all parties.

[0171] 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. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to 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 (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0172] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0173] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A ferro-resonant identification method, characterized in that, The method comprises: obtaining target bus measurement parameters corresponding to a target system bus in a power system, and obtaining bus zero sequence voltage corresponding to the target system bus according to power measurement parameters in the target bus measurement parameters; in the case where the target system bus has a fault, performing Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of frequency division resonance, fundamental frequency resonance or frequency multiplication resonance; obtaining a second judgment result corresponding to the ferromagnetic element according to linearity measurement parameters in the target bus measurement parameters and the power measurement parameters; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus; in the case where the ferromagnetic resonance mode represented by the first judgment result is the same as the ferromagnetic resonance mode represented by the second judgment result, the same ferromagnetic resonance mode is determined as a target ferromagnetic resonance mode corresponding to the ferromagnetic element; after the step of obtaining the bus zero sequence voltage corresponding to the target system bus according to the power measurement parameters in the target bus measurement parameters, the method further comprises: obtaining bus three-phase voltage recording data corresponding to the target system bus; the bus three-phase voltage recording data is obtained by collecting data of at least two alternating current cycles; obtaining a voltage peak average value before the voltage fault time and at least two continuous voltage peaks after the voltage fault time according to the bus three-phase voltage recording data and the voltage fault time corresponding to the target system bus; obtaining a ratio of the peak average value and a sum of the ratio of the average value according to the voltage peak average value and the continuous voltage peaks; judging whether the target system bus has a fault according to the ratio of the peak average value and the sum of the ratio of the average value; the step of judging whether the target system bus has a fault according to the ratio of the peak average value and the sum of the ratio of the average value comprises: if the sum of the ratio of the average value is greater than a preset threshold value, and the ratio of the peak average value has one phase less than 1, then the fault type of the target system bus is single-phase ground short circuit; if the sum of the ratio of the average value is less than or equal to the preset threshold value, or the ratio of the peak average value has one phase not less than 1, then it is determined that the target system bus has no fault, and the ferromagnetic resonance identification is terminated.

2. The method of claim 1, wherein, the step of obtaining the second judgment result corresponding to the ferromagnetic element according to the linearity measurement parameters in the target bus measurement parameters and the power measurement parameters comprises: obtaining a ground capacitance reactance corresponding to the target system bus according to the linearity measurement parameters in the target bus measurement parameters and the power measurement parameters; obtaining a comprehensive inductance reactance corresponding to the target system bus according to the linearity measurement parameters in the target bus measurement parameters and the power measurement parameters; According to the ground capacitance reactance and the comprehensive inductance reactance, a second judgment result corresponding to the ferromagnetic element is obtained.

3. The method of claim 2, wherein, The power measurement parameters include a power frequency angle frequency, a ground line coefficient, a primary side voltage, and an excitation current. According to the linearity measurement parameter in the target bus measurement parameter and the power measurement parameter, a ground capacitance reactance corresponding to the target system bus is obtained, including: According to the ground line coefficient and the linearity measurement parameter, a frequency capacitance characteristic corresponding to the target system bus is obtained. The reciprocal of the frequency capacitance characteristic is calculated to obtain the ground capacitance reactance corresponding to the target system bus.

4. The method of claim 3, wherein, According to the linearity measurement parameter in the target bus measurement parameter and the power measurement parameter, a comprehensive inductance reactance corresponding to the target system bus is obtained, including: According to the primary side voltage and the excitation current, an excitation impedance corresponding to the target system bus is obtained. According to the power frequency angle frequency and the linearity measurement parameter, a frequency length characteristic corresponding to the target system bus is obtained. In the case where the value of the excitation impedance is consistent with the value of the frequency length characteristic, a comprehensive inductance reactance corresponding to the target system bus is obtained.

5. The method of claim 2, wherein, According to the ground capacitance reactance and the comprehensive inductance reactance, a second judgment result corresponding to the ferromagnetic element is obtained, including: In the case where the quotient of the ground capacitance reactance and the comprehensive inductance reactance is greater than 0.01 and less than 0.07, a second judgment result corresponding to the ferromagnetic element is obtained, and the second judgment result is the sub-frequency resonance; In the case where the quotient of the ground capacitance reactance and the comprehensive inductance reactance is greater than 0.07 and less than 0.55, a second judgment result corresponding to the ferromagnetic element is obtained, and the second judgment result is the fundamental frequency resonance; In the case where the quotient of the ground capacitance reactance and the comprehensive inductance reactance is greater than 0.55 and less than 2.8, a second judgment result corresponding to the ferromagnetic element is obtained, and the second judgment result is the multiple frequency resonance.

6. A ferro-resonant discrimination device, characterized in that The device includes: A bus zero sequence voltage obtaining module is configured to obtain a target bus measurement parameter corresponding to a target system bus in a power system, and obtain a bus zero sequence voltage corresponding to the target system bus according to a power measurement parameter in the target bus measurement parameter. A first judgment result obtaining module is configured to, in the case where the target system bus has a fault, perform Fourier transform on the bus zero sequence voltage to obtain a first judgment result corresponding to a ferromagnetic element; the first judgment result is used to represent a ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus, and the ferromagnetic resonance mode includes one of a sub-frequency resonance, a fundamental frequency resonance, or a multiple frequency resonance. A second judgment result obtaining module is configured to obtain a second judgment result corresponding to the ferromagnetic element according to a linearity measurement parameter in the target bus measurement parameter and the power measurement parameter; the second judgment result is used to represent the ferromagnetic resonance mode of the ferromagnetic element corresponding to the target system bus. The target ferromagnetic resonance mode determination module is configured to determine the same ferromagnetic resonance mode as the target ferromagnetic resonance mode corresponding to the ferromagnetic element in a case where the ferromagnetic resonance mode represented by the first determination result is the same as the ferromagnetic resonance mode represented by the second determination result. The bus zero sequence voltage obtaining module is further configured to obtain bus three-phase voltage recording data corresponding to the target system bus; the bus three-phase voltage recording data is obtained by collecting data of at least two alternating current periods; according to the bus three-phase voltage recording data and a voltage fault time corresponding to the target system bus, a voltage peak average value before the voltage fault time is obtained, and at least two continuous voltage peaks after the voltage fault time are obtained; according to the voltage peak average value and the continuous voltage peaks, a peak average value ratio corresponding to the target system bus and a sum of average value ratios are obtained; and according to the peak average value ratio and the sum of average value ratios, it is determined whether the target system bus has a fault. The bus zero sequence voltage obtaining module is further configured to, if the sum of average value ratios is greater than a preset threshold value and the peak average value ratio of one phase is less than 1, determine that the fault type of the target system bus is a single-phase ground short circuit; and if the sum of average value ratios and the peak average value ratio do not satisfy the above conditions, determine that the target system bus has no fault, and terminate the execution of the ferromagnetic resonance identification. 7.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-6 when the computer program is executed by the processor. The processor executes the computer program to implement the steps of the method of any one of claims 1 to 5.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 5.

9. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 5. The computer program is executed by the processor to implement the steps of the method of any one of claims 1 to 5.

Images