CN114598038A - Characteristic current identification method suitable for low-voltage transformer area - Google Patents
Characteristic current identification method suitable for low-voltage transformer area Download PDFInfo
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- CN114598038A CN114598038A CN202210500254.4A CN202210500254A CN114598038A CN 114598038 A CN114598038 A CN 114598038A CN 202210500254 A CN202210500254 A CN 202210500254A CN 114598038 A CN114598038 A CN 114598038A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
- H02J13/0001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission using modification of a parameter of the network power signal
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to the technical field of power line carrier communication, and discloses a characteristic current identification method suitable for a low-voltage transformer area, which comprises the following steps: transmitting a characteristic current signal to a power grid by transmitting end equipment in a low-voltage transformer area; other equipment in the power grid line receives the current signal, and the intensity of the characteristic current signal is calculated in a sliding manner through discrete Fourier transform; demodulating an identification code according to the characteristic current signal intensity, and performing cross-correlation calculation on the identification code and the characteristic code to obtain a correlation value; if the correlation value is larger than the threshold value, the characteristic current signal is judged to be identified, otherwise, the characteristic current signal is judged not to be identified. The invention does not need the identification code to be completely consistent with the characteristic code, can identify the characteristic current signal based on the calculated correlation value of the characteristic code and the identification code, minimizes the influence of noise in a power channel, effectively improves the identification accuracy of the characteristic current signal, and ensures the accuracy of the topology identification of the low-voltage distribution room.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a characteristic current identification method suitable for a low-voltage transformer area.
Background
The power distribution network is an important component of a smart grid architecture, and the low-voltage power distribution network topological structure is a key ring of power distribution management.
The trend of power distribution network management in the future gradually changes from traditional extensive management to modern fine management, and the fine management needs to have an accurate topological structure. Meanwhile, the topological structure of the low-voltage transformer area plays an important role in the aspects of maintenance and repair of power lines, stable operation of a power grid, accurate measurement of electric energy and the like.
The existing topology identification method of the low-voltage transformer area is mainly realized by means of identification of characteristic current signals. The method comprises the steps that a characteristic current signal is sent out through equipment such as a carrier module, an intelligent circuit breaker and an LTU, the current signal is received through power grid transmission at the equipment such as an energy controller, the intelligent circuit breaker and the LTU, an identification code is obtained through demodulation, and if the identification code is consistent with the sent characteristic code, the identification of the characteristic current signal is considered to be successful. However, the power line is mainly used for transmitting electric energy, noise in a transmission channel is large, the signal-to-noise ratio of a current signal at a receiving end is low, a demodulation result is easily affected, an identification code cannot be correctly decoded, a transmitted feature code cannot be matched, identification failure is caused, and identification accuracy is seriously affected.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides the characteristic current identification method suitable for the low-voltage distribution room, the identification code is not required to be completely consistent with the characteristic code, the characteristic current signal can be identified based on the calculated correlation values of the characteristic code and the identification code, the influence of noise in a power channel is minimized, and the identification accuracy of the characteristic current signal is effectively improved.
The purpose of the invention can be realized by the following technical scheme:
a characteristic current identification method suitable for a low-voltage transformer area comprises the following steps:
s1: in a power distribution network line of a low-voltage transformer area, sending end equipment sends a current signal with the current of A; wherein the current signal has a center frequency of f and a power frequency of f0Characteristic frequency of f1And f2(ii) a Wherein the signature sequence of the current signal has m-bit signature codes CSEach bit having a duration of tcFeature code CSDenoted by 1 and 0, 1 denotes a transmitted signal, and 0 denotes no transmitted signal;
s2: based on size tcThe rectangular window and the sliding step length s, discrete Fourier transform is carried out on the received current signal at the receiving end equipment, and the characteristic frequency f of sliding calculation is f1And f2The calculated current signal intensity value is circularly stored;
s3: extracting m bits from the stored current signal strength array at an interval x to form an identification code C of a receiving endR；
S4: for the feature code C from the transmitting endSAnd the identification code C of the receiving endRPerforming cross-correlation calculation to obtain a correlation value K of the two;
s5: and if the correlation value K is larger than the preset threshold value T, judging that the characteristic current signal is identified, otherwise, judging that the characteristic current signal is not identified.
Preferably, the characteristic frequency f1And f2The calculation formula of (2) is as follows:
f1 = f - f0
f2 = f + f0
wherein f represents the center frequency of the current signal, f0Representing the power frequency of the current signal.
Preferably, the sliding step length S in S2 is the minimum positive period of the current signal period and the power frequency period received by the receiving end.
Preferably, the calculation formula of the spacing x in S3 is:
wherein, tcRepresenting the duration of each bit of the signature code and s the sliding step.
Preferably, the cross-correlation calculation formula in S4 is:
wherein K (p) represents the calculated p-th correlation value, Cs(n) denotes the nth signature from the transmitting end, CR(n + p) represents the n + p-th identification code of the receiving end, and w represents the total number of the identification codes of the receiving end.
Preferably, the sending end device in step S1 is a power meter or a line termination unit LTU or an intelligent circuit breaker.
Preferably, the receiving-end device in step S2 is an energy controller or a line termination unit LTU or an intelligent circuit breaker.
Preferably, the value of T in step S5 is 3 times the value of a.
The invention has the beneficial technical effects that: the identification code is not required to be completely consistent with the feature code, the feature current signal can be identified based on the calculated feature code and the correlation value of the identification code, the influence of noise in a power channel is minimized, the identification accuracy of the feature current signal is effectively improved, and therefore the accuracy of the low-voltage distribution room topology identification is guaranteed.
Drawings
FIG. 1 is a general flow diagram of the present invention.
Fig. 2 is a diagram of a characteristic current waveform transmitted in an embodiment of the present invention.
Fig. 3 is a partial current waveform diagram when the code bit of the feature code is 1 in the embodiment of the present invention.
Fig. 4 shows the current signal strength obtained by the sliding calculation in the embodiment of the present invention.
Fig. 5 is a correlation value between the signature and the identification in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
Examples are given.
The embodiment provides a characteristic current identification method suitable for a low-voltage transformer area, and the core idea of the method is as follows: in a low-voltage station area, equipment at a sending end transmits a characteristic current signal with certain central frequency to a power grid, other equipment in a power grid line receives the characteristic current signal, the intensity of the characteristic current signal is calculated based on discrete Fourier transform sliding, an identification code is demodulated, and cross-correlation calculation is carried out on the identification code and the characteristic code to obtain a correlation value; and if the correlation value is larger than the preset threshold value, judging that the characteristic current signal is identified, otherwise, judging that the characteristic current signal is not identified.
As shown in fig. 1, a characteristic current identification method suitable for a low-voltage transformer area includes the following steps:
s1: as shown in fig. 2, in a distribution network line in a low-voltage transformer area in an embodiment, a sending-end intelligent circuit breaker sends a current signal with a current magnitude of 0.3A; wherein the current signal has a center frequency f =833.33Hz and a power frequency f0=50Hz, calculating the characteristic frequency f1=783.33Hz、f2=883.33 Hz; wherein the signature sequence of the current signal has 16 bits of signature code CSEach bit having a duration of tc=0.6s, feature code CSBy 1 and 0, 1 indicates a transmission signal, and 0 indicates no transmission signal. Feature code CSIs [ 1110001001101011 ]]The waveform of the partial current when the code bit is 1 is shown in fig. 3.
S2: based on size tcThe method comprises the steps of carrying out discrete Fourier transform on a received current signal at a receiving-end intelligent circuit breaker according to a rectangular window and a sliding step length s, carrying out sliding calculation on current signal intensities with characteristic frequencies of 783.33Hz and 883.33Hz, and circularly storing a calculated signal intensity value. The sliding step length s is the minimum positive period of the current signal period and the power frequency period received by the receiving-end intelligent circuit breaker, and in the embodiment, s =0.06 s. All in oneIn order to simulate the characteristic of low signal-to-noise ratio of a power line, Gaussian white noise of-24 dB is added into a current signal of the receiving-end intelligent circuit breaker. The resulting current signal strength from the final slip calculation is shown in fig. 4.
S3: extracting 16 bits from the stored current signal intensity array at an interval x to form an identification code C of the receiving-end intelligent circuit breakerR. The formula for the interval x is:
wherein, tcRepresents the duration of each bit of the signature code, s represents the sliding step;
calculated in the examples x = 10; extracted receiving code CRIs [ 1010001001101010 ]]And the 2 nd and 16 th codes are not consistent with the feature code from the intelligent circuit breaker at the sending end, so that the identification fails by using a conventional method, namely observing whether the feature code is consistent with the identification code to judge whether the feature signal is identified.
S4: for the characteristic code C from the intelligent circuit breaker of the sending terminalSAnd the identification code C of the receiving endRThe cross-correlation calculation is performed to obtain the correlation value K of the two, and the result is shown in fig. 5. The cross-correlation calculation formula is:
wherein K (p) represents the calculated p-th correlation value, Cs(n) denotes the nth signature from the transmitting end, CR(n + p) represents the n + p-th identification code of the receiving end, and w represents the total number of the identification codes of the receiving end.
S5: as can be seen from fig. 5, if the correlation value is significantly greater than the threshold value 0.9, it is decided that the characteristic current signal is recognized.
In summary, under the condition of low signal-to-noise ratio, the identification code is distorted due to noise interference, two-bit deviation exists between the identification code and the feature code, and the conventional method fails, but the method of the invention can still accurately identify the feature signal.
The above-mentioned embodiments are illustrative of the specific embodiments of the present invention, and are not restrictive, and those skilled in the relevant art can make various changes and modifications to obtain corresponding equivalent technical solutions without departing from the spirit and scope of the present invention, so that all equivalent technical solutions should be included in the scope of the present invention.
Claims (8)
1. A characteristic current identification method suitable for a low-voltage transformer area is characterized by comprising the following steps:
s1: in a power distribution network line of a low-voltage transformer area, sending end equipment sends a current signal with the current of A; wherein the current signal has a center frequency of f and a power frequency of f0Characteristic frequency of f1And f2(ii) a Wherein the signature sequence of the current signal has m-bit signature codes CSEach bit having a duration of tcFeature code CSDenoted by 1 and 0, 1 denotes a transmitted signal, and 0 denotes no transmitted signal;
s2: based on the size tcThe rectangular window and the sliding step length s, discrete Fourier transform is carried out on the received current signal at the receiving end equipment, and the characteristic frequency f of sliding calculation is f1And f2And circularly storing the calculated current signal intensity value;
s3: extracting m bits from the stored current signal strength array at an interval x to form an identification code C of a receiving endR；
S4: for the feature code C from the transmitting endSAnd the identification code C of the receiving endRPerforming cross-correlation calculation to obtain a correlation value K of the two;
s5: and if the correlation value K is larger than the preset threshold value T, judging that the characteristic current signal is identified, otherwise, judging that the characteristic current signal is not identified.
2. The method for identifying the characteristic current of the low-voltage transformer area as claimed in claim 1, wherein the characteristic frequency f is1And f2The calculation formula of (2) is as follows:
f1 = f - f0
f2 = f + f0
wherein f represents the center frequency of the current signal, f0Representing the power frequency of the current signal.
3. The method for identifying the characteristic current applicable to the low-voltage transformer area as claimed in claim 1, wherein the sliding step length S in S2 is a minimum positive period of a current signal period and a power frequency period received by the receiving end.
4. The method for identifying the characteristic current of the low-voltage transformer area according to claim 1, wherein the calculation formula of the spacing x in the step S3 is as follows:
wherein, tcRepresenting the duration of each bit of the signature code and s the sliding step.
5. The method for identifying the characteristic current of the low-voltage transformer area according to claim 1, wherein the cross-correlation calculation formula in S4 is as follows:
wherein K (p) represents the calculated p-th correlation value, Cs(n) denotes the nth signature from the transmitting end, CR(n + p) represents the n + p-th identification code of the receiving end, and w represents the total number of the identification codes of the receiving end.
6. The method for identifying the characteristic current of the low-voltage transformer area as claimed in claim 1, wherein the sending terminal device in the step S1 is a power meter or a line terminal unit LTU or an intelligent circuit breaker.
7. The method for identifying the characteristic current of the low-voltage transformer area as claimed in claim 1, wherein the receiving device in the step S2 is an energy controller or a line termination unit LTU or an intelligent circuit breaker.
8. The method for identifying the characteristic current of the low-voltage transformer area according to claim 1, wherein the value of T in the step S5 is 3 times the value of a.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115567083A (en) * | 2022-09-23 | 2023-01-03 | 青岛鼎信通讯股份有限公司 | Characteristic current communication method suitable for electric power field |
| CN115701005A (en) * | 2022-11-04 | 2023-02-07 | 杭州万高科技股份有限公司 | Platform area identification method based on Z-plane zero-pole design |
| CN116660612A (en) * | 2023-07-31 | 2023-08-29 | 青岛鼎信通讯科技有限公司 | Characteristic current detection method |
| CN117459186A (en) * | 2023-12-21 | 2024-01-26 | 青岛鼎信通讯股份有限公司 | Communication method applied to low-voltage electric leakage locator |
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Application publication date: 20220607 |