CN110266348B - Method for identifying distribution room based on OFDM carrier signal - Google Patents
Method for identifying distribution room based on OFDM carrier signal Download PDFInfo
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B3/00—Line transmission systems
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- H—ELECTRICITY
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- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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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
- H04B2203/5462—Systems for power line communications
- H04B2203/5466—Systems for power line communications using three phases conductors
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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
- H04B2203/5462—Systems for power line communications
- H04B2203/5479—Systems for power line communications using repeaters
Abstract
The invention relates to a method for identifying a station area based on OFDM carrier signals, which comprises two processes, namely firstly confirming an OFDM subcarrier frequency point attenuated from two times to one time as a station area identification signal, and then carrying out station area identification by using the OFDM signal of a selected subcarrier; the frequency form of the transformer area identification signal is confirmed through carrier communication of the secondary side and the primary side of the distribution transformer, and the carrier communication module of the primary side sends a signal for blocking the transmission of the secondary side transformer area identification signal on the primary side, so that the transformer area identification signal transmitted based on a power line cannot be transmitted to other transformer areas, and the transformer area outdoor transformer relationship is effectively identified.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a station area identification method based on OFDM carrier signals.
Background
The correct identification of the transformer substation relationship is the current business requirement of low-voltage power distribution, and the power consumption management department needs to check user files according to the user file, so that the file relationship corresponding to a power supply user under a transformer substation is accurate, and the error-free management data is guaranteed. Based on the correct transformer relation of the transformer area, the power management department can correctly account the total power consumption of the transformer area users and judge the line loss rate of the transformer area, thereby effectively tracking and analyzing the method for reducing the line loss rate. The transformer area subscriber relationship is combined with the phase relationship, and the transformer area subscriber relationship can also be used for balancing the power load and reducing the unbalanced load loss.
The low-voltage transformer area identification equipment which is put into use in the market at present is based on characteristic parameters, FSK carrier waves or pulse current technologies, the test principles of the methods are unclear or principle defects exist, and the transformer area user change relationship cannot be effectively identified.
Disclosure of Invention
Aiming at the problem that low-voltage transformer area identification equipment which is put into use in the market at present cannot effectively identify the transformer area indoor transformation relation, the invention provides a method for identifying the transformer area based on OFDM carrier signals.
A station area identification method based on OFDM carrier signals is characterized in that a concentrator provided with a carrier module CCO is installed at the output end of the secondary side of a distribution transformer, an electric energy meter under the secondary side station area is provided with a carrier module STA and can realize networking communication through the CCO, and the method comprises the following steps:
firstly, a primary side high-voltage three-phase carrier communication module STA-P3H is accessed to a carrier meter reading network with a low-voltage concentrator carrier module CCO as a network center according to a carrier networking link layer protocol through carrier communication signals, wherein the carrier communication signals are networking communication signals of the carrier meter reading network based on a power line;
secondly, the CCO informs a high-voltage three-phase carrier communication module STA-P3H of about to start a station area identification frequency band test process through a carrier communication signal and informs STA-P3H of the sending time of a test signal for station area identification;
the 'station area identification frequency band test process' is specifically as follows: in the process of selecting a subcarrier frequency point, a low-voltage concentrator carrier module CCO firstly sends out station area identification test signals of all subcarriers within 10-500 kHz in an OFDM signal mode, the station area identification test signals are received by a high-voltage three-phase carrier communication module STA-P3H, and STA-P3H feeds back the strength of each received subcarrier signal to the CCO; the CCO selects a subcarrier frequency point with larger attenuation as a subcarrier frequency point selected by a final station area identification sending signal;
thirdly, the CCO informs the STA-P3H of the fact that the station area identification process is about to be started through a carrier communication signal, and informs the STA-P3H of the signal amplitude value of the selected station area identification signal on each subcarrier and the time of transmitting the station area identification signal;
the station area identification process comprises the following steps: the CCO sends a test signal and STA-P3H sends a blocking signal;
the station area identification process specifically comprises the following steps: the CCO loads own identification information based on the selected subcarriers to identify the transformer area; when the CCO sends an identification signal, the STA-P3H sends an interference signal aiming at the subcarrier frequency points, the propagation of a station area identification signal on the primary side is blocked, and the station area identification signal cannot be identified by carrier modules STA of low-voltage electric energy meters in other station areas; the STA which is positioned in the local secondary station area and can receive the identification signal of the station area marks the state of the station area, and finally the CCO reads the state of each STA and sorts the identification result of the station area;
and fourthly, the CCO starts to collect the station area state, the STA module reports the station area state of the STA module to the CCO through carrier communication signals, the station area state comprises an identification of whether the STA detects the station area identification signals, the detected station area identification information and a phase mark of the station area, and the CCO integrally counts and records the number of the STA module which belongs to the station area, the number of the STA module which is not the station area, the address number of the corresponding electric energy meter of the STA module and the number of the corresponding electric power user.
According to the method for identifying the distribution area based on the OFDM carrier signals, a three-phase electric energy meter is arranged at a position, behind a voltage transformer and a current transformer, of a primary side of a distribution transformer, and a primary side three-phase carrier communication module STA-P3H is assembled on the three-phase electric energy meter.
In the first step, the CCO can judge that the modules and the corresponding electric energy meters belong to the CCO station area through the STA module applying for network access based on the carrier communication signal; the CCO judges that the modules and the corresponding electric energy meters do not belong to the area where the CCO is located.
The station area identification method based on the OFDM carrier signal is characterized in that error correction check coding of the station area identification signal adopts convolutional coding.
The station area identification method based on the OFDM carrier signals, wherein the carrier communication signals are loaded in a single-phase mode, and the carrier communication signals are respectively loaded in A, B, C single phases; the station area identification test signal, the station area identification signal and the station area identification blocking signal are simultaneously loaded by A, B, C three phases.
The method for identifying the station area based on the OFDM carrier signal, wherein in the third step:
3-1) a low-voltage electric energy meter carrier module STA capable of receiving a station area identification signal sent by a CCO (central office organization) in the station area and analyzing station area identification information, wherein the low-voltage electric energy meter carrier module STA reports the station area state of the STA to the CCO through a carrier communication signal, and simultaneously reports the signal intensity of the received station area identification signal to the CCO; so that the CCO manages and controls the further relay forwarding of the station area identification signal;
3-2) CCO selects a low-voltage electric energy meter carrier module STA with the signal intensity smaller than a set threshold and the network level larger than the threshold as a station area identification relay STA module;
3-3) the CCO informs a primary side high-voltage three-phase carrier communication module STA-P3H and other low-voltage electric energy meter carrier modules STA through carrier communication signals, and the informing content comprises the following steps: the identification list of the station area identification relay STA module, the sending time of the identification list and the load data of the station area identification signal, wherein the load data of the station area identification signal comprises station area identification information and relay forwarding levels.
In the third step, the relay STA module selected by the CCO is a secondary side three-phase carrier communication module.
In the third step, the relay STA module selected by the CCO is 3 secondary side single-phase carrier communication modules, and a first, a second, and a third secondary side single-phase carrier communication module of the 3 secondary side single-phase carrier communication modules respectively correspond to an a phase, a B phase, or a C phase of the three phases; STA and CCO can network deployment communication based on the carrier, and these 3 single-phase carrier communication modules of secondary side all carry out the relay transmission of platform district identification signal under CCO's control.
The station area identification method based on the OFDM carrier signals, wherein the carrier signal access circuit of the primary side three-phase carrier communication module STA-P3H is provided with an impedance matching circuit, the impedance matching circuit has a low-impedance frequency band in the frequency band of the station area identification test signals, and has high impedance in the frequency band of the carrier communication signals.
According to the station area identification method based on the OFDM carrier signals, the frequency form of the station area identification signals is confirmed through carrier communication of the secondary side and the primary side of the distribution transformer, and the carrier communication module of the primary side sends out signals for blocking the transmission of the secondary side station area identification signals on the primary side, so that the condition that the station area identification signals transmitted based on a power line cannot be transmitted to other station areas is ensured, and the station area user variation relation is effectively identified.
Drawings
Fig. 1 is a schematic structural diagram of a station area identification method based on an OFDM carrier signal according to the present invention;
fig. 2 is a flow chart of the method for identifying a cell based on an OFDM carrier signal according to the present invention;
FIG. 3 is a schematic diagram of an impedance matching circuit in the method for identifying a cell based on an OFDM carrier signal according to the present invention;
fig. 4 is a topology diagram of a broadband carrier communication network.
Detailed Description
The invention provides a station area identification method based on OFDM carrier signals, which comprises two processes, namely firstly confirming the OFDM subcarrier frequency points attenuated from the second time to the first time as station area identification signals, and then carrying out station area identification by using the OFDM signals of the selected subcarriers. In the first process of selecting a subcarrier frequency point, a low-voltage concentrator carrier module CCO firstly sends a station area identification test signal of all subcarriers within 10-500 kHz in an OFDM signal mode, and the station area identification test signal is received by a high-voltage three-phase carrier communication module STA-P3H. STA-P3H feeds back the received signal strength of each subcarrier to the CCO. And the CCO selects the subcarrier frequency point with larger attenuation as the subcarrier frequency point selected by the final station area identification sending signal. Then, in the second process, the CCO loads its own identification information based on the selected subcarrier to perform station area identification. When the CCO sends the identification signal, the STA-P3H sends an interference signal for the subcarrier frequency points, so as to block the propagation of the station area identification signal on the primary side, and the station area identification signal cannot be identified by STAs (low-voltage power meter carrier modules) of other station areas. And the STA which is positioned in the local secondary station area and can receive the station area identification signal marks the station area state of the STA, and finally the CCO reads the state of each STA and sorts the station area identification result.
The specific technical scheme is as follows:
a station area identification method based on OFDM carrier signals is characterized in that a concentrator provided with a carrier module CCO is installed at the output end of the secondary side of a distribution transformer, an electric energy meter under the secondary side station area is provided with a carrier module STA and can realize networking communication through the CCO, and the method comprises the following steps:
firstly, a primary side high-voltage three-phase carrier communication module STA-P3H is accessed to a carrier meter reading network with a low-voltage concentrator carrier module CCO as a network center according to a carrier networking link layer protocol through carrier communication signals, wherein the carrier communication signals are networking communication signals of the carrier meter reading network based on a power line;
secondly, the CCO informs a high-voltage three-phase carrier communication module STA-P3H of about to start a station area identification frequency band test process through a carrier communication signal and informs STA-P3H of the sending time of a test signal for station area identification;
the 'station area identification frequency band test process' is specifically as follows: in the process of selecting the subcarrier frequency point, the low-voltage concentrator carrier module CCO firstly sends out station area identification test signals of all subcarriers within 10-500 kHz in an OFDM signal mode, the station area identification test signals are received by the high-voltage three-phase carrier communication module STA-P3H, and the STA-P3H feeds back the strength of each received subcarrier signal to the CCO. The CCO selects a subcarrier frequency point with larger attenuation as a subcarrier frequency point selected by a final station area identification sending signal;
thirdly, the CCO informs the STA-P3H of the fact that the station area identification process is about to be started through a carrier communication signal, and informs the STA-P3H of the signal amplitude value of the selected station area identification signal on each subcarrier and the time of transmitting the station area identification signal;
the station area identification process comprises the following steps: the CCO sends a test signal and STA-P3H sends a blocking signal;
the station area identification process specifically comprises the following steps: and the CCO loads own identification information based on the selected subcarriers to identify the station area. When the CCO sends an identification signal, the STA-P3H sends an interference signal aiming at the subcarrier frequency points, the propagation of a station area identification signal on the primary side is blocked, and the station area identification signal cannot be identified by carrier modules STA of low-voltage electric energy meters in other station areas; the STA which is positioned in the local secondary station area and can receive the identification signal of the station area marks the state of the station area, and finally the CCO reads the state of each STA and sorts the identification result of the station area;
and fourthly, the CCO starts to collect the station area state, the STA module reports the station area state of the STA module to the CCO through carrier communication signals, the station area state comprises an identification of whether the STA detects the station area identification signals, the detected station area identification information and a phase mark of the station area, and the CCO integrally counts and records the number of the STA module which belongs to the station area, the number of the STA module which is not the station area, the address number of the corresponding electric energy meter of the STA module and the number of the corresponding electric power user.
The station area identification method based on the OFDM carrier signals is characterized in that a three-phase electric energy meter is installed at the position, behind a voltage transformer and a current transformer, of the primary side of a distribution transformer, and a primary side three-phase carrier communication module STA-P3H is assembled on the three-phase electric energy meter.
The method for identifying the station area based on the OFDM carrier signals is characterized in that in the first step, STA modules which access to the network can be applied through the carrier communication signals, and the CCO judges that the modules and the corresponding electric energy meters belong to the station area where the CCO is located; the CCO judges that the modules and the corresponding electric energy meters do not belong to the area where the CCO is located.
The station area identification method based on the OFDM carrier signals is characterized in that error correction check coding of the station area identification signals adopts convolutional coding.
The station area identification method based on the OFDM carrier signals is characterized in that the carrier communication signals are loaded in a single-phase loading mode, and the carrier communication signals are respectively loaded in A, B, C single phases; the station area identification test signal, the station area identification signal and the station area identification blocking signal are simultaneously loaded by A, B, C three phases.
The station area identification method based on the OFDM carrier signal is characterized in that: in the third step:
3-1) a low-voltage electric energy meter carrier module STA capable of receiving a station area identification signal sent by a CCO (central office organization) in the station area and analyzing station area identification information, wherein the low-voltage electric energy meter carrier module STA reports the station area state of the STA to the CCO through a carrier communication signal, and simultaneously reports the signal intensity of the received station area identification signal to the CCO; so that the CCO manages and controls the further relay forwarding of the station area identification signal;
3-2) CCO selects a low-voltage electric energy meter carrier module STA with the signal intensity smaller than a set threshold and the network level larger than the threshold as a station area identification relay STA module;
3-3) the CCO informs a primary side high-voltage three-phase carrier communication module STA-P3H and other low-voltage electric energy meter carrier modules STA through carrier communication signals, and the informing content comprises the following steps: the identification list of the station area identification relay STA module, the sending time of the identification list and the load data of the station area identification signal, wherein the load data of the station area identification signal comprises station area identification information and relay forwarding levels.
The method for identifying the station area based on the OFDM carrier signals is characterized in that in the third step, the relay STA module selected by the CCO is a secondary side three-phase carrier communication module.
The method for identifying the station area based on the OFDM carrier signals is characterized in that in the third step, a relay STA module selected by a CCO is 3 secondary side single-phase carrier communication modules, and a first secondary side single-phase carrier communication module, a second secondary side single-phase carrier communication module and a third secondary side single-phase carrier communication module in the 3 secondary side single-phase carrier communication modules respectively correspond to an A phase, a B phase or a C phase in three phases; STA and CCO can network deployment communication based on the carrier, and these 3 single-phase carrier communication modules of secondary side all carry out the relay transmission of platform district identification signal under CCO's control.
The station area identification method based on the OFDM carrier signals is characterized in that the carrier signal access circuit of the primary side three-phase carrier communication module STA-P3H is provided with an impedance matching circuit, the impedance matching circuit has a low-impedance frequency band in the frequency band of the station area identification test signals, and has high impedance in the frequency band of the carrier communication signals.
In the technical scheme of the invention, a concentrator provided with a carrier module CCO is installed nearby at the output of the secondary side of a distribution transformer, an electric energy meter under a secondary side transformer area is provided with a carrier module STA and can communicate through CCO networking, a three-phase carrier communication device is installed on the primary side of the distribution transformer after passing through a voltage transformer and a current transformer, and the three-phase carrier communication device comprises a primary side three-phase carrier communication module STA-P3H and a power supply module, as shown in figure 1, wherein PT is the power transformer, and CT is the current transformer.
The method for identifying the station area based on the OFDM carrier signal comprises the following steps as shown in figure 2:
firstly, a primary side three-phase carrier communication module STA-P3H accesses a carrier meter reading network with a carrier module CCO as a network center according to a carrier networking link layer protocol through carrier communication signals. The carrier communication signal is a networking communication signal of the carrier meter reading network based on a power line. The adopted carrier networking link layer protocol adopts a beacon marked with network reference time, the network access node and the CCO realize clock synchronization, and the CCO informs each node and the sending time of the communication message of the CCO through the beacon. The network center corresponds to a carrier meter reading network described below. The carrier meter reading network is a network with a tree-shaped branch structure, each branch is equivalent to transmitting data of a lower node to a higher node through a relay, and the data are finally collected to a network center (CCO). As shown in fig. 4, the PCO is a proxy station, and relay forwarding is performed in communication; the STA is a general communication station. The relay node PCO is used for forwarding data in uplink communication and downlink communication, and paths of the uplink communication and the downlink communication can be consistent or inconsistent, so that the consistency has the advantage of simple algorithm; the advantage of inconsistency is that the optimal path can be selected, and the transmission speed is fast.
In the second step, the CCO informs the STA-P3H of the fact that the station identification band test procedure is about to be started through the carrier communication signal, and informs the STA-P3H of the test signal transmission time for station identification. The test signal for station area identification is an OFDM modulation signal with the same amplitude loaded on all subcarriers covering the selected test frequency band, and the frequency band of the station area identification test signal is a frequency band lower than that of the carrier communication signal.
At a given time, STA-P3H receives a test signal for station identification transmitted by the CCO and transmits station identification band test data to the CCO via a carrier communication signal. The station identification band test data includes attenuation amplitude values of the received station identification test signal on each subcarrier from secondary to primary of the transformer.
Thirdly, the CCO informs the STA-P3H of the impending station area identification procedure through a carrier communication signal, and informs the STA-P3H of the signal amplitude value of the selected station area identification signal at each subcarrier and the time of transmitting the station area identification signal. The station area identification signal is a communication signal which loads CCO station area identification information load data through error correction check coding and is added with a preamble by adopting a phase shift keying modulation mode for each subcarrier in a station area identification signal frequency band. And the CCO selects a part of electric energy meter carrier STA modules as station area identification relay STA modules, and the station area identification relay STA modules forward station area identification signals according to the CCO specified time. The electric energy meter carrier STA module capable of receiving the signal marks that the electric energy meter corresponding to the STA module belongs to the CCO region.
The STA-P3H transmits a station area identification blocking signal that blocks reception and identification of station area identification information in the station area identification signal transmitted from the secondary-side CCO and the station area identification relay STA module at the primary side of the transformer at the timing when the CCO and its station area identification relay STA module transmit the station area identification signal. The station area identification blocking signal and the load data loaded on each subcarrier by the station area identification blocking signal are random sequence data, the amplitude of the random sequence data is smaller than the signal amplitude value of the station area identification signal on each subcarrier, and is larger than the signal amplitude value of the station area identification signal on each subcarrier by subtracting the attenuation amplitude value from the secondary to the primary of the transformer.
And fourthly, the CCO starts to collect the station area state, the STA module reports the station area state of the CCO to the CCO through a carrier communication signal, and the CCO integrally counts and records the STA module belonging to the station area, the STA module not belonging to the station area, the corresponding electric energy meter and the electric power user.
In addition, a three-phase electric energy meter is installed on the primary side of the distribution transformer after passing through a voltage transformer and a current transformer, and a primary side three-phase carrier communication module STA-P3H is assembled on the three-phase electric energy meter.
In addition, if the STA-P3H cannot access the network through the carrier communication signal in the first step, the CCO determines that the STA modules and their corresponding power meters belong to the same station area directly through the STA modules applying for network access based on the carrier communication signal.
In addition, the error correction check coding of the station area identification signal adopts convolution coding.
In addition, the carrier communication signal adopts a single-phase loading mode, and the station area identification test signal, the station area identification signal and the station area identification blocking signal adopt a three-phase simultaneous loading mode.
In addition, in the third step, the STA module capable of receiving the station area identification signal sent by the CCO and analyzing the station area identification information in the station area reports the station area state of the CCO itself through the carrier communication signal, and also includes the signal strength of the station area identification signal received by the STA module; the CCO selects a carrier STA module with the signal intensity smaller than a set threshold value and the network level larger than the threshold value as a station area identification relay STA module; the CCO informs the STA-P3H and other electric energy meter carrier STA module station areas of an identification list of the identification relay STA module and the sending time of the identification list through carrier communication signals; the load data of the station area identification signal comprises station area identification information and relay forwarding levels.
In addition, in the third step, the relay STA module selected by the CCO is a secondary three-phase carrier communication module.
In addition, in the third step, the relay STA modules selected by the CCO are 3 secondary single-phase carrier communication modules corresponding to three phases respectively.
Further, the primary-side three-phase carrier communication module STA-P3H module carrier signal access circuit has an impedance matching circuit having a low impedance frequency band within the frequency band of the station identification test signal and a high impedance in the frequency band of the carrier communication signal.
Principle explanation:
the carrier communication technology adopted by the current electricity utilization information acquisition system adopts a plurality of technologies for improving the communication performance. Firstly, bandwidth resources are fully utilized through the OFDM modulation technology, and more data can be carried and transmitted in a wider frequency band. Secondly, the low frequency of the actually used communication band is higher than 0.7MHz, the high frequency can reach 12MHz, and the sub-carrier channel can be selected based on the OFDM band. Thirdly, based on Turbo coding and decoding technology, check data is added on the basis of original data, and therefore the data receiving capacity under the negative signal-to-noise ratio is obtained by utilizing an error correction decoding algorithm. Fourth, although the field environment of the low voltage power carrier is complex, noise, attenuation and phase shift of each subcarrier communication can be effectively evaluated based on a channel estimation function, thereby improving communication performance based on channel estimation and soft demodulation techniques. Fifthly, data is sent in time domain and frequency domain to realize redundancy based on diversity copy technology, so as to avoid time domain accidental interference and avoid specific interference of some frequency points in frequency domain.
Based on the great improvement of the current carrier communication performance, the current carrier communication signal has strong transmission capability and can cross a transformer sometimes. The magnetic permeability characteristic of the transformer iron core is reduced at the frequency of 500k or more than 1MHz, at the moment, the distribution transformer is equivalent to a hollow transformer, the carrier signal in the frequency band has certain penetrability, and the frequency band is also used for the current power line carrier meter reading application. In general, in the frequency range of 1k to 1MHz, the transformer has a strong absorption effect on the band signal due to the increased eddy current loss, so that the station area identification can be performed by using the carrier signal attenuated in the band range. Therefore, the frequency band of the carrier communication signal and the frequency band of the signal used for station area identification adopt different frequency bands, and correspond to a high frequency band above 500k or 1MHz and a low frequency band below the high frequency band.
At the same time, however, the frequency transfer characteristics of practical transformers vary. Therefore, if the module STA-P3H on the primary side of the distribution transformer cannot pass through the meter reading network of the secondary-side CCO into which the carrier communication signal enters, it indicates that the carrier communication signal based on the high frequency band is not propagated to other transformer areas, and can be directly used for area identification. If the STA-P3H can access the network through the carrier communication signal, the application area is required to identify the corresponding signal frequency band, and it is tested first which frequency point signals under the frequency band will form larger attenuation when passing through the transformer. The CCO interacts with STA-P3H to know the frequency points with large attenuation and load the station area identification signals by using the frequency points, while the frequency points with good penetrability do not load or load the station area identification signals with low amplitude.
The STA-P3H module forms low impedance in the frequency band of the station identification signal through an impedance matching circuit and can also play a certain role in attenuating the station identification signal. In addition, obtaining attenuation of the station identification signal can also utilize transformer characteristics. The primary side of the distribution transformer is typically delta-connected and the secondary side is typically wye-connected. Voltage signals with the same amplitude are added to the secondary side, and primary side signals are mutually offset after star-delta conversion, so that large attenuation is obtained at the primary side. Therefore, the CCO sends the station area identification test signal and the station area identification signal at the same time in three phases. Meanwhile, the relay STA module for station area identification selects a three-phase carrier communication module, or 3 single-phase carrier communication modules respectively corresponding to three phases simultaneously transmit station area identification signals. The impedance matching circuit is shown in fig. 3, L1, C1; c7, L5 are matching network sections, L2, C2, C3, L3, C4, C5, L4, C6 are band pass filter sections having a low impedance frequency band in the frequency band of the station area identification test signal and a high impedance in the frequency band of the carrier communication signal.
By selecting the subcarriers with attenuation, the station area identification signal is greatly attenuated after passing through the distribution transformer from the secondary side to the primary side, but because each module has high sensitivity to receiving the station area identification signal, the station area identification signal can still be received by other station area signals. Further, the STA-P3H module sends the zone identification blocking signal at the same time when the CCO sends the zone identification signal, that is, the two signals collide. Based on carrier communication STA-P3H and CCO, synchronization is realized on a clock, so that by using OFDM signal characteristics, as long as the signal amplitude of the station identification blocking signal with signal collision on the corresponding subcarrier is slightly higher, the communication modules on the primary side and other station areas cannot solve CCO station area identification information contained in the station identification signal.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A station area identification method based on OFDM carrier signals is characterized in that a concentrator provided with a carrier module CCO is installed at the output end of the secondary side of a distribution transformer, an electric energy meter under the secondary side station area is provided with a carrier module STA and can realize networking communication through the CCO, and the method comprises the following steps:
firstly, a primary side high-voltage three-phase carrier communication module STA-P3H is accessed to a carrier meter reading network with a low-voltage concentrator carrier module CCO as a network center according to a carrier networking link layer protocol through carrier communication signals, wherein the carrier communication signals are networking communication signals of the carrier meter reading network based on a power line;
secondly, the CCO informs a high-voltage three-phase carrier communication module STA-P3H of about to start a station area identification frequency band test process through a carrier communication signal and informs STA-P3H of the sending time of a test signal for station area identification;
the 'station area identification frequency band test process' is specifically as follows: in the process of selecting a subcarrier frequency point, a low-voltage concentrator carrier module CCO firstly sends out station area identification test signals of all subcarriers within 10-500 kHz in an OFDM signal mode, the station area identification test signals are received by a high-voltage three-phase carrier communication module STA-P3H, and STA-P3H feeds back the strength of each received subcarrier signal to the CCO; the CCO selects a subcarrier frequency point with larger attenuation as a subcarrier frequency point selected by a final station area identification sending signal;
thirdly, the CCO informs the STA-P3H of the fact that the station area identification process is about to be started through a carrier communication signal, and informs the STA-P3H of the signal amplitude value of the selected station area identification signal on each subcarrier and the time of transmitting the station area identification signal;
the station area identification process comprises the following steps: the CCO sends a test signal and STA-P3H sends a blocking signal;
the station area identification process specifically comprises the following steps: the CCO loads own identification information based on the selected subcarriers to identify the transformer area; when the CCO sends an identification signal, the STA-P3H sends an interference signal aiming at the subcarrier frequency points, the propagation of a station area identification signal on the primary side is blocked, and the station area identification signal cannot be identified by carrier modules STA of low-voltage electric energy meters in other station areas; the STA which is positioned in the local secondary station area and can receive the identification signal of the station area marks the state of the station area, and finally the CCO reads the state of each STA and sorts the identification result of the station area;
and fourthly, the CCO starts to collect the station area state, the STA module reports the station area state of the STA module to the CCO through carrier communication signals, the station area state comprises an identification of whether the STA detects the station area identification signals, the detected station area identification information and a phase mark of the station area, and the CCO integrally counts and records the number of the STA module which belongs to the station area, the number of the STA module which is not the station area, the address number of the corresponding electric energy meter of the STA module and the number of the corresponding electric power user.
2. The method of claim 1, wherein a three-phase electric energy meter is installed at a position of the primary side of the distribution transformer after passing through the voltage transformer and the current transformer, and a primary-side three-phase carrier communication module STA-P3H is installed on the three-phase electric energy meter.
3. The method according to claim 2, wherein in the first step, the CCO determines that the modules and the corresponding power meters belong to the CCO's cell by applying for the STA modules accessing the network based on the carrier communication signal; the CCO judges that the modules and the corresponding electric energy meters do not belong to the area where the CCO is located.
4. The method of claim 1, wherein the error correction check coding of the station area identification signal is convolutional coding.
5. The method according to claim 1, wherein the carrier communication signal is loaded in a single phase, and the carrier communication signal is loaded in A, B, C each single phase; the station area identification test signal, the station area identification signal and the station area identification blocking signal are simultaneously loaded by A, B, C three phases.
6. The method of identifying a cell based on an OFDM carrier signal as claimed in claim 1, wherein: in the third step:
3-1) a low-voltage electric energy meter carrier module STA capable of receiving a station area identification signal sent by a CCO (central office organization) in the station area and analyzing station area identification information, wherein the low-voltage electric energy meter carrier module STA reports the station area state of the STA to the CCO through a carrier communication signal, and simultaneously reports the signal intensity of the received station area identification signal to the CCO; so that the CCO manages and controls the further relay forwarding of the station area identification signal;
3-2) CCO selects a low-voltage electric energy meter carrier module STA with the signal intensity smaller than a set threshold and the network level larger than the threshold as a station area identification relay STA module;
3-3) the CCO informs a primary side high-voltage three-phase carrier communication module STA-P3H and other low-voltage electric energy meter carrier modules STA through carrier communication signals, and the informing content comprises the following steps: the identification list of the station area identification relay STA module, the sending time of the identification list and the load data of the station area identification signal, wherein the load data of the station area identification signal comprises station area identification information and relay forwarding levels.
7. The method as claimed in claim 6, wherein in the third step, the relay STA module selected by the CCO is a secondary three-phase carrier communication module.
8. The method as claimed in claim 6, wherein in the third step, the relay STA modules selected by the CCO are 3 secondary single-phase carrier communication modules, and a first, a second, and a third secondary single-phase carrier communication module of the 3 secondary single-phase carrier communication modules respectively correspond to the a, B, or C phases of the three phases; STA and CCO can network deployment communication based on the carrier, and these 3 single-phase carrier communication modules of secondary side all carry out the relay transmission of platform district identification signal under CCO's control.
9. The method of claim 2, wherein said primary side three-phase carrier communication module STA-P3H module carrier signal access circuit has an impedance matching circuit having a low impedance frequency band in the frequency band of the station identification test signal and a high impedance in the frequency band of the carrier communication signal.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110687332A (en) * | 2019-11-11 | 2020-01-14 | 浙江巨磁智能技术有限公司 | Automatic pairing method for switch side active ammeter and circuit breaker |
| CN110907724B (en) * | 2019-11-14 | 2021-03-26 | 华中科技大学 | Multi-area identification method and device for IT-type low-voltage distribution network |
| CN111126141B (en) * | 2019-11-19 | 2023-12-29 | 深圳供电局有限公司 | Area identification method, apparatus, system, computer device and readable storage medium |
| CN111080473B (en) * | 2019-11-19 | 2024-01-23 | 深圳供电局有限公司 | Area identification method, apparatus, computer device and readable storage medium |
| CN111030097B (en) * | 2019-12-11 | 2021-09-14 | 江苏方天电力技术有限公司 | Low-voltage distribution network platform area topology identification method and system |
| CN111711469B (en) * | 2020-06-11 | 2021-06-04 | 钜泉光电科技(上海)股份有限公司 | Signal-to-noise ratio-based station area identification method and system, storage medium and STA node |
| CN111817301A (en) * | 2020-07-23 | 2020-10-23 | 国网浙江省电力有限公司营销服务中心 | Low-voltage branch topology identification method for carrier station area |
| CN111935739A (en) * | 2020-07-30 | 2020-11-13 | 合肥新线通信科技有限公司 | Transformer area identification method based on transformer area characteristic information |
| CN113824471B (en) * | 2021-09-30 | 2023-01-20 | 广东电网有限责任公司 | Method and device for identifying distribution area, terminal equipment and storage medium |
| CN114157929A (en) * | 2021-12-09 | 2022-03-08 | 国网重庆市电力公司营销服务中心 | Method and device for identifying user-variable relationship, electronic equipment and medium |
| CN114421997B (en) * | 2021-12-14 | 2023-09-29 | 江苏芯云电子科技有限公司 | Power line carrier hybrid networking method, device and system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383265A (en) * | 2016-08-26 | 2017-02-08 | 北京中宸泓昌科技有限公司 | Transformer area and access phase automatic recognition device and method |
| CN107689817A (en) * | 2017-09-30 | 2018-02-13 | 北京中电普华信息技术有限公司 | A kind of recognition methods of user's taiwan area phase and system |
| CN109256856A (en) * | 2018-09-06 | 2019-01-22 | 石家庄科林电气股份有限公司 | The platform area topology identifying system and method realized based on power wire broadband carrier (HPLC) |
| CN109687891A (en) * | 2018-12-11 | 2019-04-26 | 国网重庆市电力公司客户服务中心 | One kind being based on the area's recognition methods of broadband power line carrier platform |
| CN109856507A (en) * | 2019-03-19 | 2019-06-07 | 广东电网有限责任公司 | A kind of low-voltage platform area line family relation recognition method and system based on current distortion |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140257580A1 (en) * | 2013-03-08 | 2014-09-11 | Chin Wen LIU | Power line carrier control module |
-
2019
- 2019-07-16 CN CN201910639355.8A patent/CN110266348B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106383265A (en) * | 2016-08-26 | 2017-02-08 | 北京中宸泓昌科技有限公司 | Transformer area and access phase automatic recognition device and method |
| CN107689817A (en) * | 2017-09-30 | 2018-02-13 | 北京中电普华信息技术有限公司 | A kind of recognition methods of user's taiwan area phase and system |
| CN109256856A (en) * | 2018-09-06 | 2019-01-22 | 石家庄科林电气股份有限公司 | The platform area topology identifying system and method realized based on power wire broadband carrier (HPLC) |
| CN109687891A (en) * | 2018-12-11 | 2019-04-26 | 国网重庆市电力公司客户服务中心 | One kind being based on the area's recognition methods of broadband power line carrier platform |
| CN109856507A (en) * | 2019-03-19 | 2019-06-07 | 广东电网有限责任公司 | A kind of low-voltage platform area line family relation recognition method and system based on current distortion |
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