CN113225105B - Low-voltage power line broadband carrier communication frequency avoiding method - Google Patents
Low-voltage power line broadband carrier communication frequency avoiding method Download PDFInfo
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- CN113225105B CN113225105B CN202110448374.XA CN202110448374A CN113225105B CN 113225105 B CN113225105 B CN 113225105B CN 202110448374 A CN202110448374 A CN 202110448374A CN 113225105 B CN113225105 B CN 113225105B
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Abstract
The invention discloses a low-voltage power line broadband carrier communication frequency avoiding method, relates to the field of power communication, and solves the technical problem that a power utilization information acquisition network and an automatic power distribution network are easy to generate signal mutual interference. The avoidance method comprises the following steps: s100: expanding a first carrier frequency band group of the existing power line carrier, and adding a second carrier frequency band group; s200: the power utilization information acquisition network and the automatic power distribution network respectively adopt the sub-frequency bands of the first carrier frequency band group and the second carrier frequency band group for communication; or the power utilization information acquisition network and the automatic power distribution network respectively adopt the sub-frequency bands of the second carrier frequency band group and the first carrier frequency band group for communication; the power utilization information acquisition network and the automatic power distribution network carry out communication avoidance by adopting non-overlapping sub-frequency bands. The invention provides an extended frequency band on the basis of the existing standard, and the power utilization information acquisition network and the automatic power distribution network carry out communication avoidance by adopting non-overlapping sub-frequency bands.
Description
Technical Field
The invention relates to the field of power communication, in particular to a low-voltage power line broadband carrier communication frequency avoiding method in the field of communication.
Background
Networks that comply with the technical specifications of low-voltage Power Line Carrier (HPLC network or Power Line Carrier communication network for short) have been installed and deployed in a large number of fields. The frequency bands used in the field environment cover four bands 0 to Band3 (see table 1 for specific frequency ranges), and the physical layer of the carrier communication scheme of the local communication network on the power distribution side complies with the technical specification of low-voltage power line broadband carrier communication and also works in the bands 0 to 3.
TABLE 1 frequency Range Table for HPLC Standard frequency bands
Since a large number of field installations of low-voltage power line broadband carrier communication networks have been carried out and automatic power distribution networks are often aftermarket networks, the aftermarket automatic power distribution networks are often required not to affect the normal operation of the existing networks. However, when two networks are deployed in the same transformer, the power line carrier communication and the automatic power distribution network interfere with each other and conflict with each other, and even the least affected Band1 and Band2 overlap between 2.44MHz and 2.93 MHz. That is, when a network already exists, networks deployed in a later period interfere with each other no matter which frequency band is used, which may cause the node retransmission times to be obviously increased, and have serious influence on the stability and reliability of the network.
Some solutions have also appeared in the prior art. The first method focuses on setting the carrier operating frequency band of the automatic power distribution network, for example, when the power consumption information acquisition system uses the band2, the carrier operating frequency band of the automatic power distribution network is set to be the band 1. The second is that the adjacent power line carrier communication network is mainly realized by staggering the channel time period occupied by a Central Coordinator (CCO) of the network through a coordination time slot. However, the MAC layer mechanism of the local communication network on the power distribution side is very different from that of HPLC, the channel access modes are completely different, and the coordination mainly negotiates the bandwidth near the CCO, and the scheme of coordinating the time slot is difficult to implement.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
four frequency bands of the existing low-voltage power line broadband carrier communication are mutually overlapped, and the power utilization information acquisition system and the automatic power distribution network cannot eliminate mutual interference of signals by selecting different frequency bands, so that the deterioration of the communication effect is caused.
Disclosure of Invention
The invention aims to provide a low-voltage power line broadband carrier communication frequency avoiding method, which aims to solve the problem that the four frequency bands of the existing low-voltage power line broadband carrier communication are mutually overlapped, and the mutual interference of signals cannot be eliminated by selecting different frequency bands by an electricity consumption information acquisition system and an automatic power distribution network, so that the communication effect is deteriorated. The technical effects that can be produced by the preferred technical scheme in the technical schemes provided by the invention are described in detail in the following.
In order to achieve the purpose, the invention provides the following technical scheme:
the invention provides a method for avoiding broadband carrier communication frequency of a low-voltage power line, which comprises the following steps:
s100: expanding a first carrier frequency band group of power line carrier communication, and adding a second carrier frequency band group;
s200: the power utilization information acquisition network and the automatic power distribution network respectively adopt the sub-frequency bands of the first carrier frequency band group and the second carrier frequency band group for communication;
or
The power utilization information acquisition network and the automatic power distribution network respectively adopt the sub-frequency bands of the second carrier frequency band group and the first carrier frequency band group for communication;
the power utilization information acquisition network and the automatic power distribution network carry out communication avoidance by adopting non-overlapping sub-frequency bands;
the power utilization information acquisition network and the automatic power distribution network are communicated through nodes; the nodes comprise a central coordinator, an agent coordinator and a site; the central coordinator is a central node in the communication network, and the agent coordinator and the station are child nodes in the communication network;
in step S200, the communication avoidance of the automatic power distribution network includes the following steps:
s210: the nodes of the automatic power distribution network sense and collect information of a surrounding power utilization information acquisition network through a neighbor network, and send the information to the central node through a beacon frame;
s220: the central node judges whether the information of the power utilization information acquisition network is sensed, if so, step S230 is executed, and if not, step S240 is executed;
s230: the automatic power distribution network communicates by adopting a sub-frequency band which is not overlapped with the power utilization information acquisition network;
s240: the automatic power distribution network adopts any one sub-frequency band of the first carrier frequency band group for networking;
s250: after the automatic power distribution network completes networking, the central node collects the information of the power utilization information acquisition network sensed by the sub-nodes, and selects the sub-frequency bands in the second carrier frequency band group as standby frequency bands;
s260: the central node of the automatic power distribution network sends information of switching carrier frequency bands to nodes of the whole network in a broadcasting mode, and the nodes of the whole network are switched to the standby frequency bands for communication;
s270: the central node of the automatic power distribution network designates any one or all network nodes to dynamically sense the information of the surrounding power utilization information acquisition network, and the step S210 is executed.
Preferably, the first carrier frequency band group includes four sub-frequency bands, which are a first sub-frequency band, a second sub-frequency band, a third sub-frequency band and a fourth sub-frequency band; the second carrier frequency band group comprises three sub-frequency bands which are respectively a fifth sub-frequency band, a sixth sub-frequency band and a seventh sub-frequency band; the first sub-frequency band and the fifth sub-frequency band have no overlapped frequency; the second sub-band and the sixth sub-band have no overlapped frequency; the third sub-band, the fourth sub-band and the seventh sub-band have no overlapping frequencies; and the electricity utilization information acquisition network and the automatic power distribution network respectively adopt a pair of sub-frequency bands which are not overlapped with each other to carry out communication.
Preferably, the physical layer of the power line carrier communication performs communication by using an OFDM modulation and demodulation method, and can shield part of subcarrier frequencies during modulation and demodulation so as to avoid an interference frequency band.
Preferably, the power consumption information acquisition network operates in any one of the sub-bands of the first carrier band group, and the automatic power distribution network operates in the frequency range of the second carrier band group by shielding part of the sub-carriers.
Preferably, the power line carrier communication shields the carrier frequency according to a subcarrier number, and a conversion formula freq ═ num × 0.024414 of the subcarrier number and the carrier frequency is provided, wherein the subcarrier number num belongs to [1,511], and the corresponding carrier frequency freq ranges from 0.024414MHz to 12.475554 MHz.
Preferably, the step S210 further includes the following sub-steps:
s211: the nodes sense and collect the carrier frequency band information of the surrounding power utilization information acquisition network through a neighbor network before networking;
s212: the power utilization information acquisition network transmits information through the beacon frame, and the nodes of the automatic power distribution network extract the address, the identification symbol and the sub-frequency band information of the central coordinator of the power utilization information acquisition network for sensing conflict by analyzing the beacon frame.
Preferably, in step S260, the central node of the automatic power distribution network sends information for switching a carrier frequency band to nodes of the whole network in a broadcast frame mode, where the broadcast frame includes the standby frequency band and time information for switching the carrier frequency band.
Preferably, the frequency range of the fifth sub-band is 0.488281-1.879883 MHz; the frequency range of the sixth sub-band is 0.488281-2.368164 MHz; the frequency range of the seventh sub-band is 3.002930-5.615234 MHz.
The implementation of one of the technical schemes of the invention has the following advantages or beneficial effects:
after the standard carrier frequency band originally used by HPLC is expanded, the expanded frequency band used by the automatic power distribution network is determined by obtaining the working frequency band of the power utilization information acquisition network, so that the frequency range used by the carrier in the power utilization information acquisition network is avoided, the two systems can share the channel of the power line without interference, and the sharing process is automatically completed without additional engineering configuration and manual intervention. The technical problem of the power consumption information acquisition system that exists among the prior art all competes the power line with automatic power distribution network and transmits data, mutual interference between the signal, arouses the deterioration of communication effect is solved. The carrier frequency band function of the method can enable two networks to share the same power line medium, and the existing power utilization information acquisition system can be continuously used without interference. Meanwhile, the potential problem of information transmission in an automatic power distribution network is solved, and the development of related services is supported in terms of reliability, time delay and real-time performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a first flowchart of a first embodiment of the present invention;
FIG. 2 is a second flowchart of a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 4 is a flow chart of avoidance for an automatic power distribution network according to a first embodiment of the present invention;
FIG. 5 is a diagram illustrating a multi-network coexistence environment according to an embodiment of the present invention;
fig. 6 is a diagram illustrating the principle and effect of carrier frequency band avoidance according to an embodiment of the present invention.
Detailed Description
In order that the objects, aspects and advantages of the present invention will become more apparent, various exemplary embodiments will be described below with reference to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration various exemplary embodiments in which the invention may be practiced. The same numbers in different drawings identify the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below do not represent all implementations consistent with the present disclosure. It is to be understood that they are merely examples of processes, methods, apparatus, etc., consistent with certain aspects of the present disclosure, as detailed in the appended claims, and that other embodiments may be used, or structural and functional modifications may be made to the embodiments set forth herein, without departing from the scope and spirit of the present disclosure.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," and the like are used in the orientations and positional relationships illustrated in the accompanying drawings for the purpose of facilitating the description of the present invention and simplifying the description, and do not indicate or imply that the elements so referred to must have a particular orientation, be constructed in a particular orientation, and be operated. The terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The term "plurality" means two or more. The terms "connected" and "coupled" are to be construed broadly and may include, for example, a fixed connection, a removable connection, an integral connection, a mechanical connection, an electrical connection, a communicative connection, a direct connection, an indirect connection via intermediate media, and may include, for example, a connection between two elements or an interaction between two elements. The term "and/or" includes any and all combinations of one or more of the associated listed items. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In order to explain the technical solution of the present invention, the following description is made by way of specific examples, which only show the relevant portions of the embodiments of the present invention.
The first embodiment is as follows:
as shown in fig. 1 to 6, the present invention provides a method for avoiding wideband carrier communication frequency of a low-voltage power line, comprising the following steps:
s100: expanding a first carrier frequency band group of power line carrier communication, and adding a second carrier frequency band group; specifically, the existing power line carrier communication standard is a first carrier frequency band group; on the basis of the existing standard, selecting a part which is not overlapped with the standard sub-frequency band as an expanded sub-frequency band for expansion, wherein the expanded sub-frequency band is called a second carrier frequency band group;
s200: the power utilization information acquisition network and the automatic power distribution network respectively adopt sub-frequency bands of the first carrier frequency band group and the second carrier frequency band group for communication; or the power utilization information acquisition network and the automatic power distribution network respectively adopt sub-frequency bands of the second carrier frequency band group and the first carrier frequency band group for communication; specifically, when the electricity information acquisition network adopts a sub-band of any one carrier band group, the automatic power distribution network adopts a sub-band of another carrier band group for communication;
the power utilization information acquisition network and the automatic power distribution network carry out communication avoidance by adopting non-overlapping sub-frequency band communication. Specifically, the sub-frequency bands adopted by the power utilization information acquisition network and the automatic power distribution network are not overlapped on the frequency band, signals do not generate interference, and communication avoidance is performed between the two parties.
As an optional implementation manner, an existing power line carrier communication standard frequency band is named as a first carrier frequency band group, and the first carrier frequency band group includes four sub-frequency bands, namely a first sub-frequency band, a second sub-frequency band, a third sub-frequency band and a fourth sub-frequency band; specifically, the first sub-band, the second sub-band, the third sub-band and the fourth sub-band are respectively band0, band1, band2 and band3 of the existing power line carrier communication standard frequency band; the expanded frequency band is named as a second carrier frequency band group, and the second carrier frequency band group comprises three sub-frequency bands which are respectively a fifth sub-frequency band, a sixth sub-frequency band and a seventh sub-frequency band; specifically, the fifth sub-band, the sixth sub-band and the seventh sub-band are respectively a band5, a band6 and a band7 of the conventional power line carrier communication standard frequency band; at this time, each sub-band is as shown in table 2:
TABLE 2 frequency Range Table for sub-bands after extension of the band
The first sub-band and the fifth sub-band have no overlapping frequency, that is, there is no overlapping frequency between the band0 and the band 5; frequencies of the second sub-band and the sixth sub-band which do not overlap, namely, frequencies between the band1 and the band6 which do not overlap; frequencies where none of the third, fourth and seventh sub-bands overlap, i.e. frequencies where there is no overlap between band2, band3 and band 7.
The electricity utilization information acquisition network and the automatic power distribution network are communicated by adopting a pair of sub-frequency bands which are not overlapped with each other. Specifically, a sub-band having no overlapping frequency with any sub-band of the first carrier band group exists in the second carrier band group, and no matter the power consumption information acquisition network uses the sub-band of the first carrier band group or the sub-band of the second carrier band group for communication, the automatic power distribution network can use the sub-band of the other band group for communication with the sub-band of the power consumption information acquisition network; the two sub-frequency bands are not overlapped with each other, and conflict can be avoided between the two networks. At this time, the avoidance relationship between the electricity information collection network and the automatic power distribution network is shown in table 3:
TABLE 3 frequency band avoidance relationship between power consumption information acquisition network and automatic power distribution network
| Frequency band | Power consumption information acquisition network HPLC use frequency band | Automatic power distribution network using HPLC frequency band |
| 1 | Band 0 | [Band 5] |
| 2 | Band 1 | [Band 6] |
| 3 | Band 2 | [Band 7] |
| 4 | Band 3 | [Band 7] |
As an alternative embodiment, as shown in fig. 6, the electricity information collection network and the automatic power distribution network communicate through nodes; specifically, the nodes comprise a central coordinator, an agent coordinator and a site; the central coordinator is a central node in the communication network, and the proxy coordinator and the station are child nodes in the communication network.
As an alternative embodiment, as shown in fig. 4, the automatic power distribution network avoiding method in step S200 further includes the following steps:
s210: the nodes of the automatic power distribution network sense and collect the information of the surrounding power utilization information acquisition network through the neighbor network, and send the information to the central node through the beacon frame; specifically, the central coordinator is a central node in the communication network and is responsible for completing functions such as networking control, network maintenance and management, and a corresponding device entity is a concentrator local communication unit; the station is a slave node in a communication network, and a corresponding equipment entity is a communication unit and comprises an electric energy meter carrier module, an I-type collector carrier module or an II-type collector; the beacon frame is a management message frame which is sent by a central coordinator, an agent or a site, carries network management and maintenance information and is used for a specific purpose; optionally, the site and the central coordinator are both provided with a neighbor network discovery process, and can sense and collect surrounding power utilization information acquisition network information through the neighbor network discovery process, and both of the sites and the central coordinator rely on beacon frames to transmit messages;
s220: the central node judges whether the information of the power utilization information acquisition network is sensed, if so, step S230 is executed, and if not, step S240 is executed; specifically, the beacon period of the power utilization information acquisition network is 1-10 seconds, and in each beacon period, the central coordinator and the agent coordinator can send beacons; the beacon sending time of the station is uncertain, the automatic power distribution network nodes are in Band 0-Band 3, and the stay time of each frequency Band is not less than 20 seconds; this can cover the beacon periods of the central coordinator and the proxy coordinators; although a single node may not be able to sense the existence of a site, considering that the number of local communication network nodes on the power distribution side is large, the probability of sensing a certain HPLC network is still very high;
s230: the automatic power distribution network communicates by adopting a sub-frequency band which is not overlapped with the power utilization information acquisition network; specifically, if the sub-frequency bands adopted by the power utilization information acquisition network are sensed, the automatic power distribution network communicates by adopting the sub-frequency bands which are not overlapped with the power utilization information acquisition network, the sub-frequency bands adopted by the two networks are not overlapped, and signals cannot interfere with each other;
s240: the automatic power distribution network adopts any sub-frequency band of the first carrier frequency band group to carry out networking; specifically, the automatic power distribution network uses any one sub-band of the first carrier band group for networking, so that the subsequent switching to the sub-band of the second carrier band group is facilitated, wherein a band2 frequency band is preferred;
s250: after the automatic power distribution network completes networking, the central node collects the information of the power utilization information acquisition network sensed by the sub-nodes, and selects the sub-frequency band in the second carrier frequency band group as a spare frequency band; specifically, after networking, the central coordinator can collect the sensing information of each station or additionally submit the sensed power utilization information acquisition network and the carrier channel use information thereof to the central coordinator in the process of adding the station into the network, and the central coordinator finally selects one sub-frequency band in the second carrier frequency band group with the minimum interference to the existing surrounding network for subsequent actions;
s260: a central node of the automatic power distribution network sends information of switching carrier frequency bands to nodes of the whole network in a broadcasting mode, and the nodes of the whole network are switched to the standby frequency bands for communication; specifically, the central coordinator sends a broadcast frame for switching a carrier frequency band to the nodes of the whole network, and the information of the switched frequency band is determined by a spare frequency band;
s270: the central node of the automatic power distribution network appoints any one or the whole network nodes to dynamically sense the information of the surrounding power utilization information acquisition network, and the step S210 is executed; specifically, in the network operation process, the central coordinator needs to dynamically adjust the network, designate any one node or the whole network node for dynamic sensing, and judge whether to perform the work of switching the working frequency band of the whole network according to the result, thereby further enhancing the adaptability of the network.
As an alternative embodiment, step S210 includes the following sub-steps:
s211: before networking, the nodes sense and collect carrier frequency band information of a surrounding power utilization information acquisition network through a neighbor network; specifically, each node is provided with a neighbor network discovery process, and through the neighbor network, the nodes can collect carrier frequency band information of a surrounding electricity utilization information acquisition network;
s212: the power utilization information acquisition network transmits information through the beacon frame, and the node of the automatic power distribution network extracts the address, the identification symbol and the sub-frequency band information of a central coordinator of the power utilization information acquisition network for sensing conflict by analyzing the beacon frame of the power utilization information acquisition network; specifically, the stations transmit messages through beacon frames, the beacon frames contain addresses, identification symbols and sub-band information of the central coordinator, the automatic power distribution network can determine the sub-band information of the automatic power distribution network through the beacon frames of the power consumption information acquisition network so as to switch the non-overlapping sub-bands, and communication avoidance of the automatic power distribution network on the power consumption information acquisition network is achieved.
As an alternative implementation manner, in step S260, the central node of the automatic power distribution network sends information of switching the carrier frequency band to the nodes of the whole network in a broadcast frame, where the broadcast frame includes information of the spare frequency band and the time of switching the carrier frequency band; specifically, the whole network station can achieve the technical effect of synchronously switching the carrier frequency band through the information of the broadcast frame.
The present embodiment proposes an extended frequency band (band5, band6, band7) for the carrier frequency range used in the existing standard. The specified frequency ranges of the existing standard frequency bands of the carrier waves from band0 to band3 have an overlapping problem, and the requirement that a power line is simultaneously used by a power utilization information acquisition network and an automatic power distribution network is difficult to realize. The carrier frequency band is expanded, and the problem of collision of two networks can be avoided by staggering signal frequency.
The embodiment is only a specific example and does not indicate such an implementation of the invention.
Example two:
the second embodiment is different from the first embodiment in that: in this embodiment, frequency avoidance is implemented by using a subcarrier shielding method.
As shown in fig. 3, in this embodiment, a first carrier frequency band group of the existing power line carrier communication is extended, and a second carrier frequency band group is added; the first carrier frequency band group and the second carrier frequency band group comprise a plurality of sub-frequency bands;
the physical layer of the HPLC uses OFDM modulation and demodulation mode to communicate, and can shield part of subcarriers during modulation and demodulation to avoid certain interference frequency bands; specifically, in the OFDM modulation scheme, carriers of receiving sub-channels correspond to transmitting sub-channels one to one, a part of the sub-carriers are shielded during modulation, and channels and frequency bands of the part of the sub-carriers are displayed idle during demodulation, so that the purpose of using only a part of the frequency bands or avoiding some interference frequency bands during demodulation is achieved;
firstly, an electrical information acquisition network is used to work in a certain standard frequency Band, and then an automatic power distribution network is enabled to occupy a frequency range conforming to the frequency range described by Band 5-Band 7 in a mode of shielding part of subcarriers; specifically, the rest frequency bands which may cause interference can be shielded according to the sub-frequency band information of the standard frequency band used by the power utilization information acquisition network, the specific shielding is realized in the prior art, and only the frequency bands without overlapping and interference are reserved for the automatic power distribution network, so that communication avoidance is realized.
As an alternative implementation, for the part of subcarriers masked during modulation, the existing HPLC standard has a formula of freq ═ num × 0.024414 between subcarrier number and carrier frequency, where subcarrier number num ∈ [1,511], corresponds to freq carrier frequency 0.024414MHz to 12.475554MHz, respectively; specifically, the subcarrier number and the carrier frequency can form a corresponding relationship through a formula freq ═ num × (0.024414), num ∈ [1,511], so that the feasibility of implementation of the scheme is enhanced.
In an optional embodiment, the frequency range of the fifth sub-band is 0.488281-1.879883 MHz; the frequency range of the sixth sub-band is 0.488281-2.368164 MHz; the frequency range of the seventh sub-band is 3.002930-5.615234 MHz; specifically, the frequency band range has other choices, and the range proposed in this embodiment is a preferred scheme proposed in this embodiment.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (8)
1. A method for avoiding broadband carrier communication frequency of a low-voltage power line is characterized by comprising the following steps:
s100: expanding a first carrier frequency band group of power line carrier communication, and adding a second carrier frequency band group;
s200: the power utilization information acquisition network and the automatic power distribution network respectively adopt the sub-frequency bands of the first carrier frequency band group and the second carrier frequency band group for communication;
or
The power utilization information acquisition network and the automatic power distribution network respectively adopt sub-frequency bands of the second carrier frequency band group and the first carrier frequency band group for communication;
the power utilization information acquisition network and the automatic power distribution network carry out communication avoidance by adopting non-overlapping sub-frequency band communication;
the power utilization information acquisition network and the automatic power distribution network are communicated through nodes; the nodes comprise a central coordinator, an agent coordinator and a site; the central coordinator is a central node in the communication network, and the agent coordinator and the station are child nodes in the communication network;
in step S200, the communication avoidance of the automatic power distribution network includes the following steps:
s210: the nodes of the automatic power distribution network sense and collect the information of the surrounding power utilization information acquisition network through a neighbor network, and send the information to the central node through a beacon frame;
s220: the central node judges whether the information of the power utilization information acquisition network is sensed or not, if so, the step S230 is executed, and if not, the step S240 is executed;
s230: the automatic power distribution network communicates by adopting a sub-frequency band which is not overlapped with the power utilization information acquisition network;
s240: the automatic power distribution network adopts any one sub-frequency band of the first carrier frequency band group for networking;
s250: after the automatic power distribution network completes networking, the central node collects the information of the power utilization information acquisition network sensed by the sub-nodes, and selects the sub-frequency bands in the second carrier frequency band group as standby frequency bands;
s260: the central node of the automatic power distribution network sends information of switching carrier frequency bands to nodes of the whole network in a broadcasting mode, and the nodes of the whole network are switched to the standby frequency bands for communication;
s270: the central node of the automatic power distribution network designates any one or all network nodes to dynamically sense the information of the surrounding power utilization information acquisition network, and the step S210 is executed.
2. The method for avoiding the frequency of the broadband carrier communication of the low-voltage power line according to claim 1,
the first carrier frequency band group comprises four sub-frequency bands which are respectively a first sub-frequency band, a second sub-frequency band, a third sub-frequency band and a fourth sub-frequency band; the second carrier frequency band group comprises three sub-frequency bands which are respectively a fifth sub-frequency band, a sixth sub-frequency band and a seventh sub-frequency band;
the first sub-frequency band and the fifth sub-frequency band have no overlapped frequency; the second sub-band and the sixth sub-band have no overlapped frequency; the third sub-band, the fourth sub-band and the seventh sub-band have no overlapping frequency;
and the electricity utilization information acquisition network and the automatic power distribution network respectively adopt a pair of sub-frequency bands which are not overlapped with each other to carry out communication.
3. The method for avoiding the frequency of the broadband carrier communication of the low-voltage power line according to claim 2,
the physical layer of the power line carrier communication adopts an OFDM modulation and demodulation mode for communication, and can shield part of subcarrier frequencies during modulation and demodulation so as to avoid an interference frequency band.
4. The method for avoiding the frequency of the low-voltage power line broadband carrier communication according to claim 3,
the power utilization information acquisition network works in any sub-frequency band of the first carrier frequency band group, and the automatic power distribution network works in the frequency range of the second carrier frequency band group by shielding part of sub-carriers.
5. The method for avoiding the frequency of the broadband carrier communication of the low-voltage power line according to claim 3,
the power line carrier communication carries out carrier frequency shielding according to subcarrier numbers, and a conversion formula freq ═ num × 0.024414 of the subcarrier numbers and the carrier frequencies is shown, wherein the subcarrier numbers num belongs to [1,511], and the corresponding carrier frequency freq ranges from 0.024414MHz to 12.475554 MHz.
6. The method for avoiding the frequency of the broadband carrier communication of the low-voltage power line according to claim 1, wherein the step S210 further comprises the following substeps:
s211: before networking, the nodes sense and collect the carrier frequency band information of the surrounding power utilization information acquisition network through a neighbor network;
s212: the power utilization information acquisition network transmits information through the beacon frame, and the nodes of the automatic power distribution network extract the address, the identification symbol and the sub-frequency band information of the central coordinator of the power utilization information acquisition network for sensing conflict by analyzing the beacon frame.
7. The method for avoiding frequency of broadband carrier communication of low-voltage power line according to claim 1, wherein in step S260,
and the central node of the automatic power distribution network sends information of switching the carrier frequency band to nodes of the whole network in a broadcasting frame mode, wherein the broadcasting frame comprises the standby frequency band and the time information of switching the carrier frequency band.
8. The method for avoiding the frequency of the broadband carrier communication of the low-voltage power line according to claim 2,
the frequency range of the fifth sub-frequency band is 0.488281-1.879883 MHz; the frequency range of the sixth sub-band is 0.488281-2.368164 MHz; the frequency range of the seventh sub-band is 3.002930-5.615234 MHz.
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| CN1571291A (en) * | 2004-04-29 | 2005-01-26 | 中国电力科学研究院 | Low-voltage power line data communication system and method |
| CN206194118U (en) * | 2016-10-26 | 2017-05-24 | 深圳量子力能源互联网有限公司 | With electric information collection device and system |
| CN107333269A (en) * | 2017-06-01 | 2017-11-07 | 国网浙江省电力公司嘉兴供电公司 | The distribution of electric power LTE230 networks and disturbance coordination method under a kind of static demand |
| CN109818780A (en) * | 2018-12-28 | 2019-05-28 | 江苏驷源电力有限公司 | A kind of low pressure broadband power line carrier communication unit and network-building method |
| CN112533239A (en) * | 2020-11-23 | 2021-03-19 | 云南电网有限责任公司信息中心 | LTE230 power wireless private network adaptive interference avoidance method |
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| CN102104575B (en) * | 2010-12-30 | 2013-05-29 | 国电龙源电气有限公司 | Carrier communication method and system for BFSK (Binary Frequency Shift Keying) spread-spectrum power line |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1571291A (en) * | 2004-04-29 | 2005-01-26 | 中国电力科学研究院 | Low-voltage power line data communication system and method |
| CN206194118U (en) * | 2016-10-26 | 2017-05-24 | 深圳量子力能源互联网有限公司 | With electric information collection device and system |
| CN107333269A (en) * | 2017-06-01 | 2017-11-07 | 国网浙江省电力公司嘉兴供电公司 | The distribution of electric power LTE230 networks and disturbance coordination method under a kind of static demand |
| CN109818780A (en) * | 2018-12-28 | 2019-05-28 | 江苏驷源电力有限公司 | A kind of low pressure broadband power line carrier communication unit and network-building method |
| CN112533239A (en) * | 2020-11-23 | 2021-03-19 | 云南电网有限责任公司信息中心 | LTE230 power wireless private network adaptive interference avoidance method |
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