CN115684717A - High-voltage line harmonic detection device and method based on electric field coupling - Google Patents
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Abstract
The invention discloses a high-voltage line harmonic detection device and method based on electric field coupling; the harmonic wave signal acquisition method comprises the steps of directly connecting a high-voltage power grid in a voltage coupling mode, and acquiring a harmonic wave signal in a mode that high-voltage harmonic waves form voltages at two no-load ends; whether the harmonic signals are abnormal or not is analyzed through the established historical data model of the harmonic signals and the characteristic values of the measured harmonics, if the harmonic signals are abnormal, background early warning can be directly carried out on the abnormal state, harmonic collection points are directly associated, and the abnormal points can be conveniently and quickly judged.
Description
Technical Field
The invention relates to the field of high-voltage detection, in particular to a high-voltage line harmonic detection device and method based on electric field coupling.
Background
With the development of modern industrial technology, the nonlinear load in the power system is greatly increased, and the large-scale application of various nonlinear and time-varying electronic devices inevitably injects a large amount of generated harmonic current into the power grid, so that phenomena such as voltage waveform distortion, voltage flicker, interference and the like of the power grid are caused, and the quality of electric energy is gradually deteriorated. All countries in the world pay attention to the management of power supply reliability and power supply quality, and the requirement is that the power grid quality and auxiliary equipment for ensuring the reliable operation of the power grid can be detected. The detection of the power quality harmonic becomes an indispensable loop in the operation and detection work nowadays. The harmonic wave refers to electric quantity of which the frequency is integral multiple of the fundamental frequency in current, and when nonlinear loads in a power grid are more, a large amount of harmonic waves are easily generated to cause damage to the power grid, and the harmonic wave is mainly expressed as follows: the loss of the transformer is increased, the service life of the motor is shortened, the loss of a lead in a distribution network and the neutral line current are caused to be large, the capacitor is aged and damaged, the relay protection misoperation is caused, the metering of a measuring instrument is inaccurate, and the like. Therefore, in order to ensure the normal operation of the power grid, the harmonic waves in the power grid need to be monitored so as to take corresponding measures to control the harmonic waves. The traditional harmonic monitoring equipment performs sampling analysis on the line of the power grid, so that the harmonic in the power grid is monitored. The traditional harmonic sensing method for the high-voltage transmission line adopts a wired mode, a harmonic detector is connected to a PT secondary side in a transformer substation, voltage on a bus is detected by detecting a small voltage signal of the PT secondary side, and harmonic content in the line is indirectly obtained. However, the detection process needs manual entry, and meanwhile, the harmonic abnormal condition in the power grid needs to be actively analyzed, which is not beneficial to real-time analysis and monitoring of the power grid state.
For example, a "distribution network harmonic monitoring device" disclosed in chinese patent literature, whose publication number CN205176134U relates to the technical field of frequency converter fault detection, includes a voltage current transformer, a harmonic detection device, a communication device and a monitoring device, where the voltage current transformer is connected to a three-phase line of a distribution transformer and transmitted to a user load, the harmonic detection device is connected to the voltage current transformer and the communication device respectively, and the communication device is connected to the monitoring device; the voltage current transformer outputs voltage current signals corresponding to three-phase lines to the harmonic detection device, the harmonic detection device receives the voltage current signals and then outputs harmonic data, and the harmonic data are output to the monitoring device through the communication device. Therefore, the working personnel can remotely receive the detected harmonic data through the communication equipment, online monitoring is realized, and the convenience of harmonic monitoring is improved. However, the device cannot automatically judge harmonic abnormal signals existing in the power grid, and needs to manually analyze and judge harmonic data, so that the detection process is more troublesome, and the abnormal signals cannot be automatically warned.
Disclosure of Invention
The invention mainly aims at the problems that the manual detection of the high-voltage power grid harmonic wave is troublesome and the online monitoring can not automatically carry out early warning on abnormal signals in the high-voltage power grid harmonic wave in the prior art; the high-voltage line harmonic detection device and method based on electric field coupling are provided; the harmonic wave signal acquisition device is directly connected with a high-voltage power grid in a voltage coupling mode, and a harmonic wave signal is acquired by utilizing a mode that high-voltage harmonic waves form voltages at two no-load ends; whether the harmonic signals are abnormal or not is analyzed through the established historical data model of the harmonic signals and the characteristic values of the measured harmonic waves, if the harmonic signals are abnormal, background early warning can be directly carried out on the abnormal state, harmonic collection points are directly associated, and the abnormal points can be conveniently and quickly judged.
The technical problem of the invention is mainly solved by the following technical scheme:
a high-voltage line harmonic detection device based on electric field coupling comprises: the voltage signal coupling circuit is connected with the high-voltage power grid and is used for measuring harmonic quantity in the high-voltage circuit; the acquisition device is used for acquiring and processing voltage signals of the coupling power grid, calculating the content of each subharmonic of the power grid, and transmitting the subharmonic to the receiving device after wireless modulation; and the receiving device is used for demodulating the received harmonic information, displaying the content of each harmonic and giving an early warning to the abnormal signal. Through voltage coupling mode lug connection high voltage electric network, utilize the mode that high-pressure harmonic can form voltage at no-load both ends to acquire the harmonic signal, it is safe and convenient, detect speed than artifical PT equipment detects very fast to it is accurate safety.
Preferably, the voltage signal coupling circuit comprises an electrode, a resistor R1, an inductor L1, a capacitor C1, a conductor GDT, a power amplifier U1, a resistor R2, a resistor R3 and a capacitor C2; the high-voltage line is connected with a port 1 of a resistor R1 through an electrode, a port 2 of the resistor R1 is connected with a port 1 of an inductor L1, a port 2 of the inductor L1 is connected with a port 1 of a capacitor C1, and a port 2 of the capacitor C1 is grounded; port 1 of resistor R1 is connected with port 1 of conductor GDT, and port 2 of conductor GDT is grounded; a port 2 of the inductor L1 is connected with a positive input end of the power amplifier U1, a negative input end of the power amplifier U1 is connected with an output end of the power amplifier U1, an output end of the power amplifier U1 is connected with a port 1 of the resistor R2, a port 2 of the resistor R2 is connected with a port 1 of the resistor R3, and a port 2 of the resistor R3 is grounded; a port 1 of the resistor R3 is connected with a port 1 of the capacitor C2, and a port 2 of the capacitor C2 is grounded; and the port 1 of the capacitor C2 is connected with the output end of the voltage signal coupling circuit. Electromagnetic interference signals existing in the circuit are filtered out by using a capacitor through connection between circuit loops, and harmonic signals in a high-voltage power grid are obtained through voltages at two ends of a conductor GDT.
Preferably, the device is externally provided with a tamper-proof shell; the interference preventing shell comprises an upper shell and a lower shell; the top of the lower shell is provided with a boss, the device is arranged by being attached to the lower shell, and the device is provided with a screw hole corresponding to the boss; a first bump is arranged on the right side of the shell; the lower shell is provided with a grounding hole matched with a grounding wire; the first lug comprises a first round hole penetrating through the first lug, and the hoop is provided with a second lug; and a second round hole suitable for the first round hole is formed in the second bump. The anti-interference shell can isolate external electromagnetic interference, and avoid the influence of external electromagnetic interference on the detection and judgment of harmonic waves; meanwhile, the boss supporting device, the first round hole and the second round hole are matched and fixed, so that the device can be fixed on the hoop, and the device is convenient to detach.
Preferably, the devices communicate with each other through a wireless network, so that smooth operation of equipment inside the devices is guaranteed.
A high-voltage line harmonic detection method adopts the device, which comprises the following steps,
s1, selecting a plurality of points to be detected; collecting a plurality of monitoring data of any frequency subharmonic at a point to be detected;
s2, dividing the monitoring data into a plurality of sections of data; calculating a characteristic value of each section of data; acquiring a historical data model; judging whether segment data is abnormal or not according to the characteristic value;
s3, if the data section is abnormal, acquiring the abnormal duration;
and S4, judging whether the frequency harmonics are abnormal or not according to the abnormal duration, if the abnormal duration exceeds the early warning time, prompting early warning by a background, reporting an abnormal state, and associating the points to be collected where the abnormal harmonics appear.
Whether the harmonic signals are abnormal or not is analyzed through the established historical data model of the harmonic signals and the characteristic values of the measured harmonics, if the harmonic signals are abnormal, background early warning can be directly carried out on the abnormal state, harmonic collection points are directly associated, and the abnormal points can be conveniently and quickly judged.
Preferably, the method for acquiring the historical data model in step S2 is as follows:
s21, setting a special period, and collecting harmonic data of each frequency of a historical monitoring point;
s22, setting a deviation range, clustering and fitting all samples in the same coordinate system, and taking median, maximum and minimum values; if the sample harmonic data deviates from the frequency median curve and the deviation range exceeds the set deviation range, screening the sample; if the deviation range does not exceed the set deviation range, the sample is valid sample data; respectively calculating sample characteristic values of each sample data group;
and S23, the sample characteristic value of the frequency is the historical data model of the frequency.
The characteristic value is used as important judgment data of the harmonic wave and can be used as a standard for judging whether the harmonic wave is normal or not. And the establishment of the standard requires the establishment and screening of a database by collecting a plurality of data of the same frequency. The collection of the historical data of a plurality of frequencies of different points to be collected can ensure that enough points exist in the sample data to facilitate subsequent judgment and serve as the basis for judging the abnormality of subsequent detection.
Preferably, the method for determining whether there is an abnormality in the segment data according to the feature value in step S2 is as follows: whether the characteristic value exceeds the deviation range in step S22, if so, the characteristic value is regarded as an abnormal value. The deviation range can be set by personal needs, generally, the deviation range needs to be set according to the number of user nodes related to a point to be detected, if the number of generated harmonics installed on the user node is large, a situation with a large abnormality may occur, but the abnormal value is a stable value and is not an abnormality with volatility, so different situations need to be judged according to different node connection states.
Preferably, the selection of the point to be collected preferentially selects a circuit node with a correlation relationship, namely a user equipment connection node; and selecting nodes with more related nodes from the circuit nodes with related relations with the nodes. The number of the associated nodes is large, the more the accessed devices are, the more the harmonic signals are generated, so that the data at the multiple associated nodes have higher reference value, and the data at the multiple associated nodes can be preferentially selected to enable the harmonic data to better reflect the harmonic signals existing in the circuit.
The invention has the beneficial effects that:
the harmonic wave signal acquisition method comprises the steps of directly connecting a high-voltage power grid in a voltage coupling mode, and acquiring a harmonic wave signal in a mode that high-voltage harmonic waves form voltages at two no-load ends; whether the harmonic signals are abnormal or not is analyzed through the established historical data model of the harmonic signals and the characteristic values of the measured harmonic waves, if the harmonic signals are abnormal, background early warning can be directly carried out on the abnormal state, harmonic collection points are directly associated, and the abnormal points can be conveniently and quickly judged.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a diagram of a voltage signal coupling circuit;
fig. 3 is a view showing the structure of the interference preventing case.
Detailed Description
It should be understood that the examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention can be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the claims appended to the present application.
The technical scheme of the invention is further specifically described by the following embodiments.
A high-voltage line harmonic detection device based on electric field coupling comprises: the voltage signal coupling circuit is connected with the high-voltage power grid and is used for measuring harmonic quantity in the high-voltage circuit; the acquisition device is used for acquiring and processing voltage signals of the coupling power grid, calculating the content of each subharmonic of the power grid, and transmitting the subharmonic to the receiving device after wireless modulation; and the receiving device is used for demodulating the received harmonic information, displaying the content of each harmonic and giving an early warning to the abnormal signal. Through voltage coupling mode lug connection high voltage electric network, utilize the mode that high-pressure harmonic can form voltage at no-load both ends to acquire the harmonic signal, it is safe and convenient, detect speed than artifical PT equipment detects very fast to it is accurate safety. The internal device communicates through a wireless network, so that information can be quickly transmitted, and the acquired device information can be transmitted to a background through the wireless network.
An anti-interference shell is arranged outside the device, and the anti-interference shell can isolate external electromagnetic interference so as to avoid the influence of external electromagnetic interference on the detection and judgment of harmonic waves; meanwhile, the boss supporting device, the first round hole and the second round hole are matched and fixed, so that the device can be fixed on the hoop, and the device is convenient to detach. The boss can directly support in the device bottom, and is fixed through the screw, and it is firm to guarantee the device, goes up the casing simultaneously and can guarantee to dismantle with the combination of casing down conveniently, and the second lug on the staple bolt outside the casing can run through inside the first lug of jam-proof casing, connects both through the screw, not only can get rid of outside electromagnetic interference to the influence of internal circuit, simultaneously can be easy to assemble and dismantle.
A high-voltage line harmonic detection method adopts the device, and comprises,
s1, selecting a plurality of points to be detected; collecting a plurality of monitoring data of any frequency subharmonic at a point to be detected;
s2, dividing the monitoring data into a plurality of segments of data; calculating a characteristic value of each section of data; acquiring a historical data model; judging whether segment data is abnormal or not according to the characteristic value;
s3, if the data section is abnormal, acquiring the abnormal duration;
and S4, judging whether the frequency harmonics are abnormal or not according to the abnormal duration, if the abnormal duration exceeds the early warning time, prompting early warning by a background, reporting an abnormal state, and associating the points to be collected where the abnormal harmonics appear.
Whether the harmonic signals are abnormal or not is analyzed through the established historical data model of the harmonic signals and the characteristic values of the measured harmonics, if the harmonic signals are abnormal, background early warning can be directly carried out on the abnormal state, harmonic collection points are directly associated, and the abnormal points can be conveniently and quickly judged.
The method for acquiring the historical data model in the step S2 comprises the following steps:
s21, setting a special period, and collecting harmonic data of each frequency of a historical monitoring point;
s22, setting a deviation range, clustering and fitting all samples in the same coordinate system, and taking median, maximum and minimum values; if the sample harmonic data deviates from the frequency median curve and the deviation range exceeds the set deviation range, screening the sample; if the deviation range does not exceed the set deviation range, the sample is valid sample data; respectively calculating sample characteristic values of each sample data group; whether the characteristic value exceeds the deviation range in step S22, if so, the characteristic value is regarded as an abnormal value. The deviation range can be set by personal needs, generally, the deviation range needs to be set according to the number of user nodes associated with a point to be detected, if the number of generated harmonics installed on the user nodes is large, a situation with a large abnormality may occur, but the abnormal value is a stable value and is not abnormal with volatility, so that different situations need to be judged according to different node connection states.
And S23, the sample characteristic value of the frequency is the historical data model of the frequency. The characteristic value is used as important judgment data of the harmonic wave and can be used as a standard for judging whether the harmonic wave is normal or not. And the establishment of the standard requires the establishment and screening of the database by collecting a plurality of data of the same frequency. The collection of the historical data of a plurality of frequencies of different points to be collected can ensure that enough points exist in the sample data to facilitate subsequent judgment and serve as the basis for judging the abnormality of subsequent detection.
Selecting a circuit node with a correlation relation, namely a user equipment connection node, from the points to be acquired; and selecting nodes with more related nodes from the circuit nodes with related relations with the nodes. The number of the associated nodes is large, the more the accessed devices are, the more the harmonic signals are generated, so that the data at the multiple associated nodes have higher reference value, and the data at the multiple associated nodes can be preferentially selected to enable the harmonic data to better reflect the harmonic signals existing in the circuit.
Claims (8)
1. The utility model provides a high-voltage line harmonic detection device based on electric field coupling which characterized in that includes:
the voltage signal coupling circuit is connected with the high-voltage power grid and is used for measuring harmonic quantity in the high-voltage circuit;
the acquisition device is used for acquiring and processing voltage signals of the coupling power grid, calculating the content of each subharmonic of the power grid, and transmitting the subharmonic to the receiving device after wireless modulation;
and the receiving device is used for demodulating the received harmonic information, displaying the content of each harmonic and giving an early warning to the abnormal signal.
2. The high-voltage line harmonic detection device based on electric field coupling according to claim 1, characterized in that: the voltage signal coupling circuit comprises an electrode, a resistor R1, an inductor L1, a capacitor C1, a conductor GDT, a power amplifier U1, a resistor R2, a resistor R3 and a capacitor C2; the high-voltage line is connected with a first end of a resistor R1 through an electrode, a second end of the resistor R1 is connected with a first end of an inductor L1, a second end of the inductor L1 is connected with a first end of a capacitor C1, and a second end of the capacitor C1 is grounded; the first end of the resistor R1 is connected with the first end of the conductor GDT, and the second end of the conductor GDT is grounded; the second end of the inductor L1 is connected with the positive input end of the power amplifier U1, the negative input end of the power amplifier U1 is connected with the output end of the power amplifier U1, the output end of the power amplifier U1 is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the first end of the resistor R3, and the second end of the resistor R3 is grounded; the first end of the resistor R3 is connected with the first end of the capacitor C2, and the second end of the capacitor C2 is grounded; the first end of the capacitor C2 is connected with the output end of the voltage signal coupling circuit.
3. The high-voltage line harmonic detection device based on electric field coupling according to claim 1, characterized in that: an anti-interference shell is arranged outside the device; the interference preventing shell comprises an upper shell and a lower shell; the top of the lower shell is provided with a boss, the device is attached to the lower shell, and the device is provided with a screw hole corresponding to the boss; a first bump is arranged on the right side of the shell; the lower shell is provided with a grounding hole matched with a grounding wire; the first lug comprises a first round hole penetrating through the first lug, and the hoop is provided with a second lug; and a second round hole suitable for the first round hole is formed in the second bump.
4. The high-voltage line harmonic detection device based on electric field coupling of claim 1, characterized in that: the devices communicate with each other through a wireless network.
5. A high-voltage line harmonic detection method adopts the device, and is characterized in that: comprises the steps of (a) preparing a substrate,
s1, selecting a plurality of points to be detected; collecting a plurality of monitoring data of any frequency subharmonic at a point to be detected;
s2, dividing the monitoring data into a plurality of sections of data; calculating a characteristic value of each section of data; acquiring a historical data model; judging whether segment data is abnormal or not according to the characteristic value;
s3, if the data section is abnormal, acquiring the abnormal duration;
and S4, judging whether the frequency harmonics are abnormal or not according to the abnormal duration, if the abnormal duration exceeds the early warning time, prompting early warning by a background, reporting the abnormal state, and associating the points to be collected where the abnormal harmonics appear.
6. The high-voltage line harmonic detection method according to claim 5, characterized in that: the method for acquiring the historical data model in the step S2 comprises the following steps:
s21, setting a special period, and collecting harmonic data of each frequency of a historical monitoring point;
s22, setting a deviation range, clustering and fitting all samples in the same coordinate system, and taking median, maximum and minimum values; if the sample harmonic data deviates from the frequency median curve and the deviation range exceeds the set deviation range, screening the sample; if the deviation range does not exceed the set deviation range, the sample is valid sample data; respectively calculating sample characteristic values of each sample data group;
and S23, the sample characteristic value of the frequency is the historical data model of the frequency.
7. A high voltage line harmonic detection method according to claim 5 or 6, characterized in that: the method for judging whether the segment data is abnormal according to the characteristic value in the step S2 is as follows: whether the characteristic value exceeds the deviation range in step S22, if so, the characteristic value is regarded as an abnormal value.
8. The high-voltage line harmonic detection method according to claim 5, characterized in that: the selection of the point to be collected preferentially selects a circuit node with a correlation relationship, namely a user equipment connection node; and selecting nodes with more related nodes from the circuit nodes with related relations with the nodes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117783758A (en) * | 2024-02-23 | 2024-03-29 | 国网智能电网研究院有限公司 | Device and method for measuring aging and pole-shell space electric field of power capacitor |
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