CN116804728A - Harmonic transmission characteristic detection method, device and equipment of capacitive voltage transformer - Google Patents

Harmonic transmission characteristic detection method, device and equipment of capacitive voltage transformer Download PDF

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Publication number
CN116804728A
CN116804728A CN202310801593.0A CN202310801593A CN116804728A CN 116804728 A CN116804728 A CN 116804728A CN 202310801593 A CN202310801593 A CN 202310801593A CN 116804728 A CN116804728 A CN 116804728A
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voltage
primary
sequence
harmonic
voltages
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武霁阳
彭光强
国建宝
陈名
陈潜
黄义隆
彭茂兰
杨光源
陈礼昕
黄之笛
龚泽
王振
黄炟超
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China Southern Power Grid Corp Ultra High Voltage Transmission Co Electric Power Research Institute
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China Southern Power Grid Corp Ultra High Voltage Transmission Co Electric Power Research Institute
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
    • G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating

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  • Power Engineering (AREA)
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  • General Physics & Mathematics (AREA)
  • Measurement Of Current Or Voltage (AREA)

Abstract

The application relates to a harmonic transmission characteristic detection method, device and equipment of a capacitive voltage transformer. The method comprises the following steps: inputting a first group of test voltages to a primary side of the capacitive voltage transformer, wherein the first group of test voltages comprise a fundamental voltage and a plurality of first harmonic voltages, and frequencies of the first harmonic voltages are different; in the process that the capacitive voltage transformer is input with a first group of test voltages, detecting voltage signals of a primary side to obtain first primary voltages corresponding to the first group of test voltages, and detecting voltage signals of a secondary side of the capacitive voltage transformer to obtain first secondary voltages corresponding to the first group of test voltages; and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage. By adopting the method, the detection efficiency of the harmonic transmission characteristic of the capacitive voltage transformer can be improved.

Description

Harmonic transmission characteristic detection method, device and equipment of capacitive voltage transformer
Technical Field
The present application relates to the field of power technologies, and in particular, to a method, an apparatus, and a device for detecting harmonic transmission characteristics of a capacitive voltage transformer.
Background
Nonlinear electric loads such as photovoltaic cells and charging piles in the power system can generate a large number of harmonic waves, the harmonic waves can increase reactive power requirements of the system, electric energy metering is affected, and the fault rate of equipment in the power system can be increased through harmonic resonance. In order to reduce the impact of harmonic problems on the proper operation of the power system, it is necessary to monitor the harmonic levels of critical equipment in the power system. CVT (Capacitive Voltage Transformer ) is a key device in an electric power system for measuring system voltage, but direct use of CVT for system voltage measurement is susceptible to harmonics in the system, so accurate detection of CVT harmonic transmission characteristics is required.
In the conventional technology, the harmonic transmission characteristics of a CVT are detected by sequentially applying each harmonic of different frequencies to the primary side of the CVT, measuring and recording harmonic signals of the primary side and the secondary side of the CVT for each frequency harmonic by a recorder, and determining the harmonic transmission characteristics of the CVT according to the recorded sets of harmonic signals.
However, the above-described method of detecting harmonic transmission characteristics of CVT is inefficient.
Disclosure of Invention
Accordingly, in order to solve the above-mentioned problems, it is necessary to provide a method, an apparatus and a device for detecting harmonic transmission characteristics of a capacitive voltage transformer with high detection efficiency.
In a first aspect, the present application provides a method for detecting harmonic transmission characteristics of a capacitive voltage transformer. The method comprises the following steps:
inputting a first group of test voltages to a primary side of the capacitive voltage transformer, wherein the first group of test voltages comprise a fundamental voltage and a plurality of first harmonic voltages, and frequencies of the first harmonic voltages are different;
in the process that the capacitive voltage transformer is input with a first group of test voltages, detecting voltage signals of a primary side to obtain first primary voltages corresponding to the first group of test voltages, and detecting voltage signals of a secondary side of the capacitive voltage transformer to obtain first secondary voltages corresponding to the first group of test voltages;
and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
In one embodiment, the plurality of harmonic voltages each have a frequency that is an odd multiple of the fundamental frequency, which is the frequency of the fundamental voltage.
In one embodiment, obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage includes:
Performing Fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing Fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage;
dividing the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and subtracting the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence;
and fitting the first amplitude-frequency sequence and the first phase-frequency sequence to obtain the harmonic transmission characteristic corresponding to the capacitive voltage transformer.
In one embodiment, the method for detecting harmonic transmission characteristics of a capacitive voltage transformer further includes:
inputting a second group of test voltages to the primary side, wherein the second group of test voltages comprise a fundamental wave voltage and a plurality of second harmonic voltages, the frequencies of the second harmonic voltages are different, and the amplitudes of the second harmonic voltages are different from the amplitudes of the first harmonic voltages;
in the process that the capacitive voltage transformer is input with a second group of test voltages, detecting a voltage signal of a primary side to obtain a second primary voltage corresponding to the second group of test voltages, and detecting a voltage signal of a secondary side to obtain a second secondary voltage corresponding to the second group of test voltages;
According to the first primary voltage and the first secondary voltage, obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer, including:
and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage, the first secondary voltage, the second primary voltage and the second secondary voltage.
In one embodiment, according to the first primary voltage, the first secondary voltage, the second primary voltage and the second secondary voltage, the harmonic transmission characteristic corresponding to the capacitive voltage transformer is obtained, including:
performing Fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing Fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage;
dividing the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and subtracting the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence;
performing Fourier expansion processing on the second primary voltage to obtain a second primary amplitude sequence and a second primary phase angle sequence corresponding to the second primary voltage, and performing Fourier expansion processing on the second secondary voltage to obtain a second secondary amplitude sequence and a second secondary phase angle sequence corresponding to the second secondary voltage;
Dividing the second primary amplitude sequence and the second secondary amplitude sequence to obtain a second amplitude frequency sequence, and subtracting the second primary phase angle sequence and the second secondary phase angle sequence to obtain a second phase frequency sequence;
carrying out weighted average treatment on the first amplitude-frequency sequence and the second amplitude-frequency sequence to obtain an average amplitude-frequency sequence; carrying out weighted average treatment on the first phase frequency sequence and the second phase frequency sequence to obtain a average phase frequency sequence;
and fitting the average amplitude-frequency sequence and the average frequency sequence to obtain the harmonic transmission characteristic corresponding to the capacitive voltage transformer.
In one embodiment, the euclidean norms of the magnitudes of the plurality of first harmonic voltages are less than or equal to the preset value.
In a second aspect, the application further provides a harmonic transmission characteristic detection device of the capacitive voltage transformer. The device comprises:
the signal input module is used for inputting a first group of test voltages to the primary side of the capacitive voltage transformer, wherein the first group of test voltages comprise fundamental wave voltages and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different;
the data acquisition module is used for detecting the voltage signal of the primary side in the process that the capacitive voltage transformer is input with the first group of test voltages to obtain a first primary voltage corresponding to the first group of test voltages, and detecting the voltage signal of the secondary side of the capacitive voltage transformer to obtain a first secondary voltage corresponding to the first group of test voltages;
And the data processing module is used for obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
In a third aspect, the present application also provides a computer device. The computer device comprises a memory storing a computer program and a processor implementing the steps of the method according to the first aspect when the processor executes the computer program.
In a fourth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to the first aspect.
In a fifth aspect, the present application also provides a computer program product. The computer program product comprising a computer program which, when executed by a processor, implements the steps of the method according to the first aspect.
According to the method, the device and the equipment for detecting the harmonic transmission characteristics of the capacitive voltage transformer, the first group of test voltages are input to the primary side of the capacitive voltage transformer, the first group of test voltages comprise fundamental wave voltages and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different; in the process that the capacitive voltage transformer is input with a first group of test voltages, detecting voltage signals of a primary side to obtain first primary voltages corresponding to the first group of test voltages, and detecting voltage signals of a secondary side of the capacitive voltage transformer to obtain first secondary voltages corresponding to the first group of test voltages; according to the first primary voltage and the first secondary voltage, the harmonic transmission characteristics corresponding to the capacitive voltage transformer are obtained, so that the first group of test voltages comprising the fundamental voltage and a plurality of first harmonic voltages are input to the primary side of the capacitive voltage transformer at the same time, only one measurement is needed for the voltage signals of the primary side and the voltage signals of the secondary side of the capacitive voltage transformer, the harmonic transmission characteristics corresponding to the capacitive voltage transformer can be obtained by processing a group of first primary voltages and first secondary voltages obtained through measurement, the detection steps are simplified, the data processing complexity is reduced, and therefore the efficiency of the harmonic transmission characteristic detection method of the capacitive voltage transformer is improved.
Drawings
FIG. 1 is a diagram of an application environment of a method for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
FIG. 2 is a flow chart of a method for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
FIG. 3 is a schematic diagram of an internal structure of a capacitive voltage transformer according to an embodiment;
FIG. 4 is a flow chart of a method for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
FIG. 5 is a flow chart of a method for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
FIG. 6 is a flow chart of a method for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
FIG. 7 is a flowchart of a method for detecting harmonic transmission characteristics of a capacitive voltage transformer according to another embodiment;
FIG. 8 is a block diagram of a device for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
FIG. 9 is a block diagram of a device for detecting harmonic transmission characteristics of a capacitive voltage transformer according to an embodiment;
fig. 10 is an internal structural view of a computer device in one embodiment.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
The harmonic transmission characteristic detection method of the capacitive voltage transformer provided by the embodiment of the application can be applied to an application environment shown in fig. 1. Wherein the terminal 102 communicates with the server 104 via a network. The data storage system may store data that the server 104 needs to process. The data storage system may be integrated on the server 104 or may be located on a cloud or other network server. The terminal 102 may be, but not limited to, various personal computers, notebook computers, smart phones, tablet computers, internet of things devices, and portable wearable devices, where the internet of things devices may be smart speakers, smart televisions, smart air conditioners, smart vehicle devices, and the like. The portable wearable device may be a smart watch, smart bracelet, headset, or the like. The server 104 may be implemented as a stand-alone server or as a server cluster of multiple servers.
The terminal 102 is used for inputting a first group of test voltages to the primary side of the capacitive voltage transformer, wherein the first group of test voltages comprises a fundamental wave voltage and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different; in the process that the capacitive voltage transformer is input with a first group of test voltages, detecting voltage signals of a primary side to obtain first primary voltages corresponding to the first group of test voltages, and detecting voltage signals of a secondary side of the capacitive voltage transformer to obtain first secondary voltages corresponding to the first group of test voltages; and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
In one embodiment, as shown in fig. 2, a method for detecting harmonic transmission characteristics of a capacitive voltage transformer is provided, and the method is applied to the application environment in fig. 1 for illustration, and includes the following steps:
step 202, a first set of test voltages is input to a primary side of a capacitive voltage transformer.
The primary side of the capacitive voltage transformer refers to a part connected with a high-voltage circuit and comprises a high-voltage terminal, a high-voltage capacitor, a medium-voltage capacitor tap, a low-voltage terminal, a low-voltage capacitor, a heavy-voltage transformer, a compensating reactor and a grounding device.
The first group of test voltages comprises a fundamental wave voltage and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different.
Illustratively, the fundamental voltage in the first set of test voltages has a frequency of 50Hz and a magnitude of 10kV; the amplitude of the first harmonic voltage is a times of the amplitude of the fundamental voltage, wherein a is any value in the range of 1% -5%, the frequency of the nth first harmonic voltage is n×50Hz, and n is each integer value in the range of 1-50.
Also exemplary, the fundamental voltage in the first set of test voltages has a frequency of 50Hz and a magnitude of 10kV; the amplitude of the first harmonic voltage is a times of the amplitude of the fundamental voltage, wherein a is any value in the range of 1% -5%, the frequency of the nth first harmonic voltage is (2 n-1) 50Hz, and n is each integer value in the range of 1-25.
Alternatively, the frequency of the fundamental voltage in the first set of test voltages may also be 60Hz.
Step 204, in the process that the capacitive voltage transformer is input with the first set of test voltages, detecting the voltage signal of the primary side to obtain a first primary voltage corresponding to the first set of test voltages, and detecting the voltage signal of the secondary side of the capacitive voltage transformer to obtain a first secondary voltage corresponding to the first set of test voltages.
The secondary side of the capacitive voltage transformer refers to a part connected with the low-voltage metering system and comprises a damping device and a secondary terminal.
Exemplary, referring to fig. 3, an exemplary schematic diagram of the internal structure of a capacitive voltage transformer having two secondary windings is shown. Inputting a first group of test voltages to a high-voltage terminal and a low-voltage terminal of a primary side of the capacitive voltage transformer, and detecting a voltage signal of the primary side between the high-voltage terminal and the low-voltage terminal in the process that the capacitive voltage transformer is input with the first group of test voltages to obtain a first primary voltage corresponding to the first group of test voltages; and detecting a voltage signal of a second secondary terminal of the secondary side of the capacitive voltage transformer to obtain a first secondary voltage corresponding to the first group of test voltages, wherein the damping device of the second secondary terminal can enable the output waveform of the transformer to be more stable, and high-voltage waveform damage detection equipment generated by accidents is avoided.
And step 206, obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
The harmonic transmission characteristics corresponding to the capacitive voltage transformer comprise harmonic amplitude-frequency transmission characteristics and harmonic phase-frequency transmission characteristics, the amplitude-frequency characteristics of the harmonic refer to the relation between the amplitude and the frequency of the harmonic after the harmonic passes through the capacitive voltage transformer, and the frequency with larger harmonic amplitude can influence the accuracy of the capacitive voltage transformer on the system voltage measurement result, so that the amplitude-frequency characteristics of the harmonic need to be acquired to be compared and determined to determine proper compensation measures; the phase frequency characteristic of the harmonic wave refers to the relationship between the phase and the frequency of the harmonic wave, and the occurrence of phase lag in the harmonic wave transmission process may cause unstable results of the capacitive voltage transformer when the system voltage is measured, so that the phase frequency characteristic of the harmonic wave needs to be obtained to make corresponding protection measures against the phase frequency characteristic.
Illustratively, analyzing the first primary voltage to obtain each frequency point voltage in the first group of test voltages, thereby obtaining fundamental wave components and harmonic components of each frequency point voltage; analyzing the first secondary voltage to obtain the voltage of each frequency point on the secondary side after the first group of test voltages are transmitted by the capacitive voltage transformer, and further obtaining the fundamental component and harmonic component of the voltage of each frequency point; obtaining the relation between the secondary side harmonic component and the primary side harmonic component at different frequencies according to the sub-harmonic components of the primary side and the secondary side, wherein the relation between the secondary side harmonic amplitude component and the primary side harmonic amplitude component at different frequencies is subjected to interpolation processing to obtain harmonic amplitude-frequency transmission characteristics; and obtaining the harmonic phase frequency transmission characteristic by interpolation processing of the relation between the secondary side harmonic phase angle component and the primary side harmonic phase angle component at different frequencies.
Further, a transfer function may be constructed from the primary-side frequency point voltages and the secondary-side frequency point voltages to express the harmonic transmission characteristics.
Illustratively, the harmonic transfer function H (jω) can be expressed as:
wherein U is n1 (jω) represents the primary-side frequency point voltages, U n2 (jω) represents each frequency point voltage on the secondary side, and n is each integer value in the range of 1 to 25.
In the method for detecting the harmonic transmission characteristics of the capacitive voltage transformer, a first group of test voltages are input to the primary side of the capacitive voltage transformer, wherein the first group of test voltages comprise a fundamental wave voltage and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different; in the process that the capacitive voltage transformer is input with a first group of test voltages, detecting voltage signals of a primary side to obtain first primary voltages corresponding to the first group of test voltages, and detecting voltage signals of a secondary side of the capacitive voltage transformer to obtain first secondary voltages corresponding to the first group of test voltages; according to the first primary voltage and the first secondary voltage, harmonic transmission characteristics corresponding to the capacitive voltage transformer are obtained, and in the embodiment, a group of test voltages are input to the primary side of the capacitive voltage transformer at the same time to obtain voltage signals required by calculating the harmonic transmission characteristics, so that the detection process of the harmonic transmission characteristics is simplified; the harmonic transmission characteristics corresponding to the capacitive voltage transformer can be obtained by analyzing and processing the detection data obtained by carrying out primary detection on the voltage signals of the primary side and the secondary side of the capacitive voltage transformer, and the calculation complexity of the harmonic transmission characteristics is reduced, so that the efficiency of the harmonic transmission characteristic detection method of the capacitive voltage transformer is improved.
In one embodiment, based on the embodiment shown in fig. 2, the frequencies of the plurality of harmonic voltages are each an odd multiple of the fundamental frequency, which is the frequency of the fundamental voltage.
The odd harmonic voltage with odd frequency of the fundamental wave frequency is selected, namely, the odd harmonic voltage is because the odd harmonic voltage in the practical application scene is easier to cause asymmetric current than the even harmonic voltage, thereby causing power loss of the capacitive voltage transformer, causing the reduction of the working stability of the capacitive voltage transformer and even causing damage to internal components.
In this embodiment, by setting the frequencies of the plurality of harmonic voltages in the first set of test voltages to be odd times the frequency of the fundamental voltage, the usability of the obtained harmonic transmission characteristics can be ensured while simplifying the detection step, compared with detecting the transmission characteristics of the harmonic voltages of odd times and the harmonic voltages of even times at the same time.
In one embodiment, based on the embodiment shown in fig. 2, as shown in fig. 4, according to the first primary voltage and the first secondary voltage, a harmonic transmission characteristic corresponding to the capacitive voltage transformer is obtained, which includes the following steps:
step 402, performing fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage.
The first primary amplitude sequence and the first primary phase angle sequence are obtained by performing Fourier expansion processing on first primary voltages, the first primary voltages are voltage signals of a primary side in the process that the capacitive voltage transformer is input with a first group of test voltages, the property of the first primary voltages belong to complex periodic signals, the first primary voltages are subjected to Fourier expansion to obtain frequency domain representations of the amplitude and the phase of the first primary voltages, and the first primary voltage Fourier expansion is arranged according to frequency to obtain the first primary amplitude sequence and the first primary phase angle sequence; the first secondary voltage is processed to be the same as the first primary voltage, fourier expansion is carried out on the first secondary voltage, and then the first secondary amplitude sequence and the first secondary phase angle sequence can be obtained according to frequency arrangement.
Step 404, performing division processing on the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and performing subtraction processing on the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence.
The first amplitude-frequency sequence is the amplitude ratio of a first secondary amplitude value to a first primary amplitude value which are arranged according to frequency; the first phase-frequency sequence is the phase angle difference of the first primary phase angle and the first secondary phase angle, which are sorted by frequency.
And step 406, fitting the first amplitude-frequency sequence and the first phase-frequency sequence to obtain the harmonic transmission characteristics corresponding to the capacitive voltage transformer.
The harmonic transmission characteristics corresponding to the capacitive voltage transformer comprise harmonic amplitude-frequency characteristics and harmonic phase-frequency characteristics, wherein the harmonic amplitude-frequency characteristics refer to harmonic amplitude-frequency characteristic curves obtained by carrying out interpolation fitting processing on the first amplitude-frequency sequence; the harmonic phase frequency characteristic refers to a harmonic phase frequency characteristic curve obtained by carrying out interpolation fitting processing on the first phase frequency sequence.
In the embodiment, the harmonic transmission characteristics of the capacitive voltage transformer can be obtained by processing a group of detection data, and compared with the detection method for obtaining the transmission characteristics by processing a plurality of groups of detection data in the prior art, the method for obtaining the transmission characteristics by processing the detection data in the prior art has smaller data volume, and can effectively reduce the calculation complexity of the detection method for the harmonic transmission characteristics of the capacitive voltage transformer.
In one embodiment, based on the embodiment shown in fig. 2, as shown in fig. 5, the method for detecting harmonic transmission characteristics of a capacitive voltage transformer further includes:
Step 502, a second set of test voltages is input to the primary side.
The second group of test voltages comprises a fundamental wave voltage and a plurality of second harmonic voltages, the frequencies of the second harmonic voltages are different, and the amplitude of the second harmonic voltages is different from that of the first harmonic voltages.
Illustratively, the fundamental voltage in the first set of test voltages has a frequency of 50Hz, the amplitude of each first harmonic voltage in the first set of test voltages is 1% of the amplitude of the fundamental voltage, and the frequency of the nth first harmonic voltage is (2 n-1) ×50Hz, where n is each integer value in the range of 1-25.
The frequency of the fundamental wave voltage in the second group of test voltages is 50Hz, the amplitude of each second harmonic voltage in the second group of test voltages is 2% of the amplitude of the fundamental wave voltage, and the frequency of the ith second harmonic voltage is (2 i-1) 50Hz, wherein i is each integer value in the range of 1-25.
In step 504, in the process that the capacitive voltage transformer is input with the second set of test voltages, the voltage signal of the primary side is detected to obtain a second primary voltage corresponding to the second set of test voltages, and the voltage signal of the secondary side is detected to obtain a second secondary voltage corresponding to the second set of test voltages.
According to the first primary voltage and the first secondary voltage, obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer, including:
step 506, obtaining the harmonic transmission characteristic corresponding to the capacitive voltage transformer according to the first primary voltage, the first secondary voltage, the second primary voltage and the second secondary voltage.
The first harmonic transmission data can be obtained according to the first primary voltage and the first secondary voltage; according to the second primary voltage and the second secondary voltage, second harmonic transmission data can be obtained; and carrying out weighted average processing on the first harmonic transmission data and the second harmonic transmission data to obtain target harmonic transmission data, and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the target harmonic transmission data.
In one possible embodiment, the second set of test voltages may be plural, and the second harmonic voltage in each of the second set of test voltages may have a magnitude j times the magnitude of the fundamental voltage, where j is any value in the range of 1% to 5%.
And obtaining a plurality of groups of second primary voltages and a plurality of groups of second secondary voltages according to the plurality of second groups of test voltages, obtaining a group of harmonic transmission data according to each group of primary voltages and each group of second secondary voltages, carrying out weighted average processing on each group of harmonic transmission data to obtain target harmonic transmission data, and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the target harmonic transmission data.
In the embodiment, the second group of test voltages with different magnitudes from the first group of test voltages are input to the primary side, multiple groups of harmonic transmission data are obtained by detecting multiple groups of primary voltages and secondary voltages, and weighted average processing is performed on each group of harmonic transmission data to obtain the harmonic transmission characteristics corresponding to the capacitive voltage transformer, so that the accuracy of the harmonic transmission characteristic detection method of the capacitive voltage transformer can be improved.
In one embodiment, based on the embodiment shown in fig. 5, as shown in fig. 6, according to the first primary voltage, the first secondary voltage, the second primary voltage, and the second secondary voltage, a harmonic transmission characteristic corresponding to the capacitive voltage transformer is obtained, including:
step 602, performing fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage.
Performing Fourier expansion processing on the first primary voltage to obtain a first primary voltage Fourier expansion, and solving the modulus value of the Fourier coefficient corresponding to each frequency by extracting the frequency and the Fourier coefficient of each item of the first primary voltage Fourier expansion to obtain a first primary amplitude sequence; and solving the inverse tangent function value of the Fourier coefficient corresponding to each frequency, and carrying out first-time phase angle sequence. The same process is performed on the first secondary voltage, and a first secondary amplitude sequence and a first secondary phase angle sequence can be obtained.
Illustratively, fourier expanding the first primary voltage to obtain a first primary voltage fourier expansion f (x) may be expressed as:
wherein a is 0 And/2 represents the average value of the first primary voltage, nω 0 Representing the frequency of harmonic components, a n Fourier coefficients representing cosine harmonic components, b n Fourier coefficients representing sinusoidal harmonic components.
Values in the first sequence of primary magnitudesAnd the value +.>Can be expressed as:
step 604, performing division processing on the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and performing subtraction processing on the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence.
Illustratively, the first amplitude-frequency sequence may be expressed as:
the first phase-frequency sequence may be expressed as:
and 606, performing Fourier expansion processing on the second primary voltage to obtain a second primary amplitude sequence and a second primary phase angle sequence corresponding to the second primary voltage, and performing Fourier expansion processing on the second secondary voltage to obtain a second secondary amplitude sequence and a second secondary phase angle sequence corresponding to the second secondary voltage.
The second primary voltage and the second secondary voltage are processed in the same manner as the first primary voltage.
Step 608, performing division processing on the second primary amplitude sequence and the second secondary amplitude sequence to obtain a second amplitude frequency sequence, and performing subtraction processing on the second primary phase angle sequence and the second secondary phase angle sequence to obtain a second phase frequency sequence.
Wherein the processing of the second primary amplitude sequence and the second secondary amplitude sequence is the same as the processing of the first primary amplitude sequence and the first secondary amplitude sequence; the processing of the second primary phase angle sequence and the second secondary phase angle sequence is the same as the processing of the first primary phase angle sequence and the first secondary phase angle sequence.
Step 610, performing weighted average processing on the first amplitude-frequency sequence and the second amplitude-frequency sequence to obtain an average amplitude-frequency sequence; and carrying out weighted average treatment on the first phase frequency sequence and the second phase frequency sequence to obtain a average phase frequency sequence.
The weighted average processing of the first amplitude-frequency sequence and the second amplitude-frequency sequence means that when the value in the average amplitude-frequency sequence is calculated, the values in the first amplitude-frequency sequence and the second amplitude-frequency sequence corresponding to each frequency are weighted according to the corresponding weights so as to obtain a more accurate average amplitude-frequency sequence.
For example, the weights of the first amplitude frequency sequence and the second amplitude frequency sequence may be assigned according to the magnitudes of the first set of test voltages and the second set of test voltages.
The process of performing the weighted average processing on the first phase frequency sequence and the second phase frequency sequence is the same as the process of performing the weighted average processing on the first amplitude frequency sequence and the second amplitude frequency sequence.
And step 612, fitting the average amplitude-frequency sequence and the average frequency sequence to obtain the harmonic transmission characteristics corresponding to the capacitive voltage transformer.
The fitting processing of the average amplitude-frequency sequence means that a function which meets the value in the average amplitude-frequency sequence and is as close to the actual data change condition as possible is constructed by utilizing the known average amplitude-frequency sequence, so that a section of continuous harmonic amplitude-frequency characteristic curve can be obtained; based on the same principle, a section of continuous harmonic phase frequency characteristic curve can be obtained by fitting the average phase frequency sequence.
For example, a linear interpolation method may be used, and the function value of the unknown point is calculated by the slope of two adjacent values assuming that the two adjacent values in the average amplitude-frequency sequence are linear.
In the above embodiment, a second set of test voltages with different magnitudes from the first set of test voltages is input to the primary side, a first amplitude frequency sequence and a first phase frequency sequence are obtained through the first primary voltage and the first secondary voltage, a second amplitude frequency sequence and a second phase frequency sequence are obtained through the second primary voltage and the second secondary voltage, and weighted average processing is performed on the first amplitude frequency sequence and the second amplitude frequency sequence to obtain an average amplitude frequency sequence; and carrying out weighted average treatment on the first phase frequency sequence and the second phase frequency sequence to obtain a mean phase frequency sequence, and carrying out fitting treatment on the mean amplitude frequency sequence and the mean phase frequency sequence to obtain the harmonic transmission characteristics corresponding to the capacitive voltage transformer, so that the deviation of the obtained harmonic transmission characteristics caused by data acquisition error due to equipment or line problems is avoided by detecting the voltages of the primary side and the secondary side of the capacitive voltage transformer twice, and the accuracy of the harmonic transmission characteristic detection method of the capacitive voltage transformer is improved.
In one embodiment, based on the embodiment shown in fig. 2, the euclidean norms of the magnitudes of the plurality of first harmonic voltages are less than or equal to the preset value.
The preset value may be based on determination of an actual condition of the harmonic voltage in an actual application scenario of the power system.
Illustratively, the Euclidean norm of the magnitudes of the multiple harmonic voltages that may be present during operation of the power system is generally within 5% of the magnitude of the fundamental voltage, and thus the magnitude U of the kth first harmonic voltage k，1 And the amplitude U of the fundamental wave voltage b The relationship of (2) can be expressed as:
wherein n represents the number of first harmonic voltages, and the value range of n is each integer value in the range of 2-50.
In this embodiment, the euclidean norms of the magnitudes of the plurality of first harmonic voltages are set to be smaller than a preset value, so that the obtained harmonic transmission characteristics are more suitable for the harmonic transmission condition of the capacitive voltage transformer when the capacitive voltage transformer works in the power system, and the scene adaptability of the method for detecting the harmonic transmission characteristics of the capacitive voltage transformer is improved.
It will be appreciated that in one embodiment, based on the embodiment shown in fig. 5, the euclidean norms of the magnitudes of the plurality of second harmonic voltages are less than the preset value. According to the actual application condition, the amplitude U of the kth second harmonic voltage k，2 And the amplitude U of the fundamental wave voltage b The relationship of (2) can be expressed as:
wherein i represents the number of second harmonic voltages, and the value range of i is each integer value in the range of 2 to 50.
In this embodiment, the euclidean norms of the amplitudes of the plurality of first harmonic voltages and the euclidean norms of the amplitudes of the plurality of second harmonic voltages are set to be smaller than a preset value, so that the obtained harmonic transmission characteristics are more suitable for the harmonic transmission condition of the capacitor voltage transformer when the capacitor voltage transformer works in the power system, and the scene adaptability of the method for detecting the harmonic transmission characteristics of the capacitor voltage transformer is improved.
In one embodiment, as shown in fig. 7, a method for detecting harmonic transmission characteristics of a capacitive voltage transformer is provided. The method comprises the following steps:
step 702, a first set of test voltages is input to a primary side of a capacitive voltage transformer.
The first group of test voltages comprises a fundamental wave voltage and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different.
Illustratively, the fundamental voltage in the first set of test voltages has a frequency of 50Hz and a magnitude of 10kV; the amplitude of the first harmonic voltage is a times of the amplitude of the fundamental voltage, wherein a is any value in the range of 1% -5%, the frequency of the nth first harmonic voltage is (2 n-1) 50Hz, and n is each integer value in the range of 1-25.
Step 704, in the process that the capacitive voltage transformer is input with the first set of test voltages, detecting the voltage signal of the primary side to obtain a first primary voltage corresponding to the first set of test voltages, and detecting the voltage signal of the secondary side to obtain a first secondary voltage corresponding to the first set of test voltages.
Step 706, a second set of test voltages is input to the primary side.
The second group of test voltages comprises a fundamental wave voltage and a plurality of second harmonic voltages, the frequencies of the second harmonic voltages are different, and the amplitude of the second harmonic voltages is different from that of the first harmonic voltages.
Illustratively, the fundamental voltage in the second set of test voltages has a frequency of 50Hz and a magnitude of 10kV; the amplitude of the second harmonic voltage is b times of the amplitude of the fundamental voltage, wherein b is any value which is not a within the range of 1% -5%, and the frequency of the jth second harmonic voltage is (2 j-1) 50Hz, wherein j is each integer value within the range of 1-25.
Alternatively, there may be a plurality of second sets of test voltages, and the amplitude of the second harmonic voltage in each second set of test voltages may be 1% to 5% of the amplitude of the fundamental voltage.
Step 708, in the process of inputting the second set of test voltages into the capacitive voltage transformer, detecting the voltage signal of the primary side to obtain a second primary voltage corresponding to the second set of test voltages, and detecting the voltage signal of the secondary side to obtain a second secondary voltage corresponding to the second set of test voltages.
Step 710, performing fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage.
Step 712, performing division processing on the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and performing subtraction processing on the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence.
And 714, performing Fourier expansion processing on the second primary voltage to obtain a second primary amplitude sequence and a second primary phase angle sequence corresponding to the second primary voltage, and performing Fourier expansion processing on the second secondary voltage to obtain a second secondary amplitude sequence and a second secondary phase angle sequence corresponding to the second secondary voltage.
Step 716, performing division processing on the second primary amplitude sequence and the second secondary amplitude sequence to obtain a second amplitude frequency sequence, and performing subtraction processing on the second primary phase angle sequence and the second secondary phase angle sequence to obtain a second phase frequency sequence.
Step 718, performing weighted average processing on the first amplitude-frequency sequence and the second amplitude-frequency sequence to obtain an average amplitude-frequency sequence; and carrying out weighted average treatment on the first phase frequency sequence and the second phase frequency sequence to obtain a average phase frequency sequence.
Optionally, the average amplitude frequency sequence and the average frequency sequence are arranged according to the frequency to obtain the voltage of each frequency of the secondary side of the capacitive voltage transformer, and the voltage of each frequency of the secondary side and the voltage of the corresponding frequency of the primary side are divided to obtain the transfer function corresponding to the capacitive voltage transformer.
And step 720, fitting the average amplitude-frequency sequence and the average frequency sequence to obtain the harmonic transmission characteristics corresponding to the capacitive voltage transformer. In the above embodiment, the first set of test voltages and the second set of test voltages are input to the primary side of the capacitive voltage transformer, and the first set of test voltages and the second set of test voltages each include the fundamental voltage and a plurality of harmonic voltages, and the frequencies of the harmonic voltages are different; in the process that the capacitive voltage transformer is input with the test voltage, voltage signals of the primary side and the secondary side are detected, analyzed and fitted to obtain harmonic transmission characteristics corresponding to the capacitive voltage transformer, the detection process of the harmonic transmission characteristics of the capacitive voltage transformer is simplified by inputting fundamental voltage and multiple harmonic voltages at the same time, a group of harmonic transmission characteristic data can be obtained by analyzing and fitting detection data obtained through primary measurement, the calculation complexity of obtaining the harmonic transmission characteristics can be effectively reduced, multiple times of detection can be carried out through changing the amplitude of the test voltage, weighted average processing is carried out on the obtained multiple groups of harmonic transmission characteristic data, and the harmonic transmission characteristics with higher accuracy are obtained.
It should be understood that, although the steps in the flowcharts related to the embodiments described above are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.
Based on the same inventive concept, the embodiment of the application also provides a harmonic transmission characteristic detection device of the capacitive voltage transformer, which is used for realizing the harmonic transmission characteristic detection method of the capacitive voltage transformer. The implementation scheme of the device for solving the problem is similar to that described in the above method, so the specific limitation in the embodiments of the device for detecting the harmonic transmission characteristic of one or more capacitive voltage transformers provided below can be referred to the limitation of the method for detecting the harmonic transmission characteristic of the capacitive voltage transformer hereinabove, and will not be described herein.
In one embodiment, as shown in fig. 8, there is provided a harmonic transmission characteristic detection apparatus of a capacitive voltage transformer, comprising: a signal input module 802, a data acquisition module 804, and a data processing module 806, wherein:
a signal input module 802, configured to input a first set of test voltages to a primary side of the capacitive voltage transformer, where the first set of test voltages includes a fundamental voltage and a plurality of first harmonic voltages, and frequencies of the first harmonic voltages are different;
the data acquisition module 804 is configured to detect a voltage signal of a primary side during a process that the capacitive voltage transformer is input with a first set of test voltages, obtain a first primary voltage corresponding to the first set of test voltages, and detect a voltage signal of a secondary side of the capacitive voltage transformer, obtain a first secondary voltage corresponding to the first set of test voltages;
the data processing module 806 is configured to obtain harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
In one embodiment, the frequency of the plurality of harmonic voltages input by the signal input module 802 is an odd multiple of the fundamental frequency, which is the frequency of the fundamental voltage.
In one embodiment, the data processing module 806 performs fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performs fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage; dividing the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and subtracting the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence; and fitting the first amplitude-frequency sequence and the first phase-frequency sequence to obtain the harmonic transmission characteristic corresponding to the capacitive voltage transformer.
In one embodiment, the signal input module 802 is further configured to input a second set of test voltages to the primary side, the second set of test voltages including a fundamental voltage and a plurality of second harmonic voltages, each second harmonic voltage having a different frequency, the second harmonic voltage having a different magnitude than the first harmonic voltage; the data acquisition module 804 is further configured to detect a voltage signal of the primary side during a process that the capacitive voltage transformer is input with the second set of test voltages, to obtain a second primary voltage corresponding to the second set of test voltages, and detect a voltage signal of the secondary side, to obtain a second secondary voltage corresponding to the second set of test voltages; the data processing module 806 is further configured to obtain harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage, the first secondary voltage, the second primary voltage, and the second secondary voltage.
In one embodiment, the data processing module 806 performs fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performs fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage; dividing the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and subtracting the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence; performing Fourier expansion processing on the second primary voltage to obtain a second primary amplitude sequence and a second primary phase angle sequence corresponding to the second primary voltage, and performing Fourier expansion processing on the second secondary voltage to obtain a second secondary amplitude sequence and a second secondary phase angle sequence corresponding to the second secondary voltage; dividing the second primary amplitude sequence and the second secondary amplitude sequence to obtain a second amplitude frequency sequence, and subtracting the second primary phase angle sequence and the second secondary phase angle sequence to obtain a second phase frequency sequence; carrying out weighted average treatment on the first amplitude-frequency sequence and the second amplitude-frequency sequence to obtain an average amplitude-frequency sequence; carrying out weighted average treatment on the first phase frequency sequence and the second phase frequency sequence to obtain a average phase frequency sequence; and fitting the average amplitude-frequency sequence and the average frequency sequence to obtain the harmonic transmission characteristic corresponding to the capacitive voltage transformer.
In one embodiment, the euclidean norms of the magnitudes of the plurality of first harmonic voltages are less than or equal to the preset value.
In one embodiment, as shown in fig. 9, a device for detecting harmonic transmission characteristics of a capacitive voltage transformer is provided, which includes a signal input module 802, a data acquisition module 804, and a data processing module 806.
The signal input module 802 is configured to input a first set of test voltages to a primary side of the capacitive voltage transformer, where the first set of test voltages includes a fundamental voltage and a plurality of first harmonic voltages, and frequencies of the first harmonic voltages are different; the signal input module 802 includes a voltage harmonic source 8022 and a medium voltage transformer 8024, wherein a primary side of the medium voltage transformer 8024 is connected with the voltage harmonic source 8022, and a secondary side of the medium voltage transformer 8024 is connected with a high voltage terminal and a low voltage terminal of the capacitive voltage transformer. The data acquisition module 804 is configured to, in a process that the capacitive voltage transformer is input with a first set of test voltages, connect with a high voltage terminal and a low voltage terminal of the capacitive voltage transformer, detect a voltage signal of a primary side to obtain a first primary voltage corresponding to the first set of test voltages, connect with a secondary terminal of the capacitive voltage transformer, detect a voltage signal of a secondary side to obtain a first secondary voltage corresponding to the first set of test voltages. The data processing module 806 is configured to obtain a first primary voltage and a first secondary voltage, and process the first primary voltage and the first secondary voltage to obtain harmonic transmission characteristics corresponding to the capacitive voltage transformer.
The above-mentioned harmonic transmission characteristic detection device of the capacitive voltage transformer may be implemented in whole or in part by software, hardware, and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, a computer device is provided, which may be a terminal, and an internal structure diagram thereof may be as shown in fig. 10. The computer device includes a processor, a memory, an input/output interface, a communication interface, a display unit, and an input means. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input/output interface. Wherein 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 and a computer program. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The input/output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless mode can be realized through WIFI, a mobile cellular network, NFC (near field communication) or other technologies. The computer program, when executed by a processor, implements a method for detecting harmonic transmission characteristics of a capacitive voltage transformer. The display unit of the computer device is used for forming a visual picture, and 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 equipment can be a touch layer covered on the display screen, can also be a key, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 10 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory and a processor, the memory having stored therein a computer program, the processor implementing the steps of the method embodiments described above when the computer program is executed.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored which, when executed by a processor, implements the steps of the method embodiments described above.
In an embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the steps of the method embodiments described above.
It should be noted that, the user information (including but not limited to user equipment information, user personal information, etc.) and the data (including but not limited to data for analysis, stored data, presented data, etc.) related to the present application are information and data authorized by the user or sufficiently authorized by each party, and the collection, use and processing of the related data need to comply with the related laws and regulations and standards of the related country and region.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magnetic random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (Phase Change Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in the form of a variety of forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), and the like. The databases referred to in the embodiments provided herein may include at least one of a relational database and a non-relational database. The non-relational database may include, but is not limited to, a blockchain-based distributed database, and the like. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (10)

1. A method for detecting harmonic transmission characteristics of a capacitive voltage transformer, the method comprising:
inputting a first group of test voltages to a primary side of a capacitive voltage transformer, wherein the first group of test voltages comprises a fundamental voltage and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different;
in the process that the capacitive voltage transformer is input with the first group of test voltages, detecting the voltage signals of the primary side to obtain first primary voltages corresponding to the first group of test voltages, and detecting the voltage signals of the secondary side of the capacitive voltage transformer to obtain first secondary voltages corresponding to the first group of test voltages;
And obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
2. The method of claim 1, wherein the plurality of harmonic voltages each have a frequency that is an odd multiple of a fundamental frequency, the fundamental frequency being a frequency of the fundamental voltage.
3. The method according to claim 1, wherein the obtaining the harmonic transmission characteristic corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage includes:
performing Fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing Fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage;
dividing the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and subtracting the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence;
And fitting the first amplitude-frequency sequence and the first phase-frequency sequence to obtain the harmonic transmission characteristic corresponding to the capacitive voltage transformer.
4. The method according to claim 1, wherein the method further comprises:
inputting a second set of test voltages to the primary side, the second set of test voltages including the fundamental voltage and a plurality of second harmonic voltages, each of the second harmonic voltages having a different frequency, the second harmonic voltages having a different magnitude than the first harmonic voltages;
in the process that the capacitive voltage transformer is input with the second group of test voltages, detecting the voltage signals of the primary side to obtain second primary voltages corresponding to the second group of test voltages, and detecting the voltage signals of the secondary side to obtain second secondary voltages corresponding to the second group of test voltages;
the obtaining the harmonic transmission characteristic corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage includes:
and obtaining harmonic transmission characteristics corresponding to the capacitive voltage transformer according to the first primary voltage, the first secondary voltage, the second primary voltage and the second secondary voltage.
5. The method of claim 4, wherein the obtaining the harmonic transmission characteristic corresponding to the capacitive voltage transformer according to the first primary voltage, the first secondary voltage, the second primary voltage, and the second secondary voltage comprises:
performing Fourier expansion processing on the first primary voltage to obtain a first primary amplitude sequence and a first primary phase angle sequence corresponding to the first primary voltage, and performing Fourier expansion processing on the first secondary voltage to obtain a first secondary amplitude sequence and a first secondary phase angle sequence corresponding to the first secondary voltage;
dividing the first primary amplitude sequence and the first secondary amplitude sequence to obtain a first amplitude-frequency sequence, and subtracting the first primary phase angle sequence and the first secondary phase angle sequence to obtain a first phase-frequency sequence;
performing Fourier expansion processing on the second primary voltage to obtain a second primary amplitude sequence and a second primary phase angle sequence corresponding to the second primary voltage, and performing Fourier expansion processing on the second secondary voltage to obtain a second secondary amplitude sequence and a second secondary phase angle sequence corresponding to the second secondary voltage;
Dividing the second primary amplitude sequence and the second secondary amplitude sequence to obtain a second amplitude frequency sequence, and subtracting the second primary phase angle sequence and the second secondary phase angle sequence to obtain a second phase frequency sequence;
carrying out weighted average treatment on the first amplitude-frequency sequence and the second amplitude-frequency sequence to obtain an average amplitude-frequency sequence; carrying out weighted average treatment on the first phase frequency sequence and the second phase frequency sequence to obtain a average phase frequency sequence;
and fitting the average amplitude-frequency sequence and the average phase-frequency sequence to obtain the harmonic transmission characteristic corresponding to the capacitive voltage transformer.
6. The method of claim 1, wherein the euclidean norms of the magnitudes of the plurality of first harmonic voltages are less than or equal to a preset value.
7. A harmonic transmission characteristic detection device for a capacitive voltage transformer, the device comprising:
the signal input module is used for inputting a first group of test voltages to the primary side of the capacitive voltage transformer, wherein the first group of test voltages comprise fundamental wave voltages and a plurality of first harmonic voltages, and the frequencies of the first harmonic voltages are different;
The data acquisition module is used for detecting the voltage signal of the primary side in the process that the capacitive voltage transformer is input with the first group of test voltages to obtain a first primary voltage corresponding to the first group of test voltages, and detecting the voltage signal of the secondary side of the capacitive voltage transformer to obtain a first secondary voltage corresponding to the first group of test voltages;
and the data processing module is used for obtaining the harmonic transmission characteristic corresponding to the capacitive voltage transformer according to the first primary voltage and the first secondary voltage.
8. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 6 when the computer program is executed.
9. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
10. A computer program product comprising a computer program, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 6.
CN202310801593.0A 2023-06-30 2023-06-30 Harmonic transmission characteristic detection method, device and equipment of capacitive voltage transformer Pending CN116804728A (en)

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