CN105337640A - Frequency offset automatic correction and main node selection method for low voltage power line communication system - Google Patents
Frequency offset automatic correction and main node selection method for low voltage power line communication system Download PDFInfo
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- CN105337640A CN105337640A CN201510677093.6A CN201510677093A CN105337640A CN 105337640 A CN105337640 A CN 105337640A CN 201510677093 A CN201510677093 A CN 201510677093A CN 105337640 A CN105337640 A CN 105337640A
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- power line
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- frequency deviation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
- H04L2027/0024—Carrier regulation at the receiver end
- H04L2027/0026—Correction of carrier offset
Abstract
The invention provides a frequency offset automatic correction and main node selection method for a low voltage power line communication system, and relates to a frequency offset automatic correction and main node selection technology for a low voltage power line communication system. The frequency offset automatic correction and main node selection method for a low voltage power line communication system solves the problem that a current method cannot autonomously select in a power-line carrier communication system. When each node in the power grid becomes silent after being energized, if the frequency offset correction frames sent from other nodes are not received in the silent period, the nodes preempt the channel by means of the CSMA mechanism. The node which preempts the channel sends the frequency offset correction frames, and if the number of times for sending the frequency offset correction frames for the node is equal to the preset number of times of the frequency offset correction frames, the node is the main node in the power grid. When other nodes receive the frequency offset correction frames, the nodes dynamically adjust their own frequency and then determine whether FC (frame control) can be analyzed correctly. If the nodes can correctly analyze FC, the nodes exit the main node selection process. If the nodes cannot correctly analyze FC, the nodes can preempt the channel by means of the CSMA mechanism after frequency adjustment. The frequency offset automatic correction and main node selection method for a low voltage power line communication system is suitable for a low voltage power line communication field.
Description
Technical field
The present invention relates to low pressure power line communication system frequency deviation automatically to correct and host node selecting technology.
Background technology
Along with the high speed development of the communication technology in recent years, power line carrier communication is also widely used in the military fields such as industrial automatic control, strong type intelligent grid, internet of things intelligent household, airborne missile.For low-voltage power line, power line carrier communication is one of effective technology carrying out group-net communication to many electric equipments.Because low-voltage power line is connected to the electric equipment of many complexity, make the communication environment of power line channel become very severe, cause the reduction of communication reliability.
The power line carrier communication networking that present stage adopts, there are the following problems:
1, present stage research low-voltage powerline carrier communication in host node be mostly that people is for presetting, can not independently select in power-line carrier communication system or artificially set in running.
2, the self-organizing in order to realize power line carrier communication runs, and in the node cluster that physical characteristic is identical, selects the host node of this network, is responsible for the operation and maintenance of network.But the research that present stage is chosen host node is less, lacks and effective select main method.
3, because Power Line Carrier Communication Module (hereinafter referred to as node) uses crystal oscillator precision not high enough, making to power between posterior nodal point exists frequency departure, and causing cannot proper communication between node.If but using High Precision Crystal Oscillator, cost will become very expensive, the actual economy used of impact.
4, present stage can realize the correcting frequency deviation of point-to-point, but between process multinode during correcting frequency deviation, causes conflict, cause correcting frequency deviation efficiency between node lower, have a strong impact on networking efficiency because part of nodes can receive multiple correcting frequency deviation frame.
Goal of the invention
The present invention is to address the problem:
1), existing method can not independently be selected or artificially set in running in power-line carrier communication system;
2), existing method is difficult to select host node in the node cluster that physical characteristic is identical, causes being difficult to realize power-line carrier communication system self-organizing and runs;
3), the frequency departure that uses High Precision Crystal Oscillator to overcome in existing method to exist between node, cause Power Line Carrier Communication Module cost high;
4), existing method is lower due to correcting frequency deviation efficiency between node, causes the inefficient problem of networking;
Thus provide a kind of low pressure power line communication system frequency deviation automatically to correct and host node choosing method.
Low pressure power line communication system frequency deviation is corrected and host node choosing method automatically, it is characterized in that: network low pressure power line communication system being equivalent to the accurate three-dimensional cobweb model composition of M individual layer, and M is positive integer; Every layer of three-dimensional cobweb model of standard forms by host node with from node; Describedly comprise via node and terminal node from node;
In the three-dimensional spider web logical topology of standard, between node, the performing step that interior host node is chosen is corrected and netted to frequency deviation automatically:
After in step one, net, each node powers on, counter all resets, and adopts CSMA mechanism silence period t, t to be real number; In quiet period, each node judges whether the beacon frame receiving the transmission of other nodes; If judged result is no, then perform step 2; If judged result is yes, then exits and select main procedure;
Step 2, this node seize channel by CSMA mechanism;
Rob the node accounting for channel and send correcting frequency deviation frame to other nodes in its communication range, described correcting frequency deviation frame comprises targeting sequencing Preamble and frame control FC; And perform step 3;
After the node not getting channel receives correcting frequency deviation frame, the frequency of dynamic conditioning oneself, and by the counter O reset of self, and judge that this node whether can correct parse for frame control FC; If can correctly resolve, perform step 2 one; If can not correctly resolve, then perform step 2 two;
Step 2 one, then this node exit and select main procedure;
Step 2 two, then this node, after adjusting frequency, return execution step 2;
Step 3, the node counter numerical value seizing channel is added 1, whether the number of times that now this node seizing channel judges to send correcting frequency deviation frame reaches and expection sends the number of times of correcting frequency deviation frame; If judged result is no, then return execution step 2; If judged result is yes, then this node seizing channel will become host node in net.
Before step 2, the node receiving beacon frame judges whether correctly to resolve beacon frame, if judged result is yes, then terminates; If judged result is no, then perform the process chosen of host node in the correcting frequency offset of step 2 to three and net.
The beneficial effect that the present invention obtains:
1), low pressure power line communication system frequency deviation of the present invention corrects and host node choosing method automatically, can realize from main separation master or artificially set host node in power-line carrier communication system in system operation.
2), low pressure power line communication system frequency deviation of the present invention corrects and host node choosing method automatically, can select host node in the node cluster that physical characteristic is identical, realizes power-line carrier communication system self-organizing and runs.
3), low pressure power line communication system frequency deviation of the present invention corrects and host node choosing method automatically, solves the problem that between low-voltage power line accurate spider web logical topology interior joint, frequency is inconsistent, reduces Power Line Carrier Communication Module cost.
4), low pressure power line communication system frequency deviation of the present invention corrects and host node choosing method automatically, reduces the collision probability that node receives multiple correcting frequency deviation frame, improves the node networking efficiency in the accurate spider web logical topology of low-voltage power line.
Low pressure power line communication system frequency deviation of the present invention is corrected automatically and host node choosing method has stronger versatility, is applicable to popularizing in the other field such as internet of things intelligent household, military affairs.
Accompanying drawing explanation
Fig. 1 is traditional plane cobweb model schematic diagram; In figure, b is host node, and a is from node;
Fig. 2 is accurate three-dimensional cobweb model schematic perspective view; In figure, b is host node, and a is terminal node;
Fig. 3 is accurate three-dimensional cobweb model schematic top plan view; In figure, b is host node, and a is from node;
Fig. 4 is accurate spider web classification form-separating structural network model schematic perspective view; In figure, A is host node, and B is from node/one-level relaying host node, and C is from node/secondary relaying host node, and D is from node/tri-grade relaying host node, and E is from node/Pyatyi relaying host node, and F is from node/six grade relaying host node;
Fig. 5 is accurate spider web classification form-separating structural network model schematic top plan view; In figure, b is host node, and a is from terminal node, and c is via node;
Fig. 6 is correcting frequency deviation and select main flow chart between node;
Embodiment
Embodiment one, low pressure power line communication system frequency deviation are corrected and host node choosing method automatically, in the accurate three-dimensional spider web logical topology of low-voltage power line, frequency deviation is adopted automatically to correct and host node choosing method can achieve choosing of internodal correcting frequency deviation and host node.
First the accurate three-dimensional spider web logical topology model of low-voltage power line is described below;
Based on the research of early stage to plane cobweb model, the present invention proposes accurate three-dimensional spider web logical topology model again.This model by host node, form from node, wherein comprises via node and terminal node from node, as shown in Figures 1 to 3.Compare plane cobweb model in early stage, accurate three-dimensional cobweb model more can reflect real network topology structure exactly, and therefore low-voltage power line communication logical network is equivalent to the network of the accurate three-dimensional spider web composition of multiple individual layer, as shown in Fig. 4 to 5 by the present invention.
The following describes in the three-dimensional spider web logical topology of standard, between node, the performing step that interior host node is chosen is corrected and netted to frequency deviation automatically:
After step 1, all nodes power on, counter all resets, and adopts CSMA mechanism to mourn in silence a period of time.In quiet period, mainly judge whether the beacon frame that can receive the transmission of other nodes.
The beacon frame that other nodes send if do not receive between step 2 quiet period and to this silence period time, node will seize channel by CSMA mechanism.Rob the node accounting for channel and send correcting frequency deviation frame (comprise targeting sequencing Preamble and frame control FrameContral, be called for short FC) to other nodes in its communication range.
Step 3, the node counter numerical value seizing channel is added 1, whether the number of times that now this node judges to send correcting frequency deviation frame sends correcting frequency deviation frame number of times with expection is equal.The number of times that expection sends correcting frequency deviation frame if do not reach, then node is seized channel with CSMA mechanism again and is sent correcting frequency deviation frame to other nodes.The number of times that expection sends correcting frequency deviation frame if reach, then this node will become host node in net.
After step 4, the node not getting channel receive correcting frequency deviation frame, then by the frequency of dynamic conditioning oneself, and this node counter is reset, and judge whether this node correctly can resolve FC.If can correctly resolve, then this node exits and selects main procedure; Otherwise this node is after adjusting frequency, channel competition choosing master will be seized with CSMA mechanism again, as shown in Figure 6.
Specific embodiment:
Correcting frequency deviation can be realized between low pressure power line communication system interior joint by method below and select main procedure.First mourn in silence a period of time after the unification of net interior nodes powers on, if do not receive the correcting frequency deviation frame of other nodes transmission within the silence period, then node will seize channel with CSMA mechanism.The node getting channel sends correcting frequency deviation frame, if this node sends the number of times of correcting frequency deviation frame with when expecting that the correcting frequency deviation frame number of times set is equal, then this node is just host node in net.Other nodes after receiving correcting frequency deviation frame, the frequency of first dynamic conditioning oneself, then judge whether correctly to resolve FC.If node correctly can resolve FC, then exit and select main procedure.If can not correctly resolve, then this category node seizes channel with CSMA mechanism again after adjusting frequency.Just frequency departure between net interior nodes can be corrected through repeatedly adjusting frequency.
Choosing in internodal correcting frequency deviation and net just can be realized in low-voltage power line carrier communication system main by said method.
Claims (2)
1. low pressure power line communication system frequency deviation is corrected and host node choosing method automatically, it is characterized in that: network low pressure power line communication system being equivalent to the accurate three-dimensional cobweb model composition of M individual layer, and M is positive integer; Every layer of three-dimensional cobweb model of standard forms by host node with from node; Describedly comprise via node and terminal node from node;
In the three-dimensional spider web logical topology of standard, between node, the performing step that interior host node is chosen is corrected and netted to frequency deviation automatically:
After in step one, net, each node powers on, counter all resets, and adopts CSMA mechanism silence period t, t to be real number; In quiet period, each node judges whether the beacon frame receiving the transmission of other nodes; If judged result is no, then perform step 2; If judged result is yes, then exits and select main procedure;
Step 2, this node seize channel by CSMA mechanism;
Rob the node accounting for channel and send correcting frequency deviation frame to other nodes in its communication range, described correcting frequency deviation frame comprises targeting sequencing Preamble and frame control FC; And perform step 3;
After the node not getting channel receives correcting frequency deviation frame, the frequency of dynamic conditioning oneself, and by the counter O reset of self, and judge that this node whether can correct parse for frame control FC; If can correctly resolve, perform step 2 one; If can not correctly resolve, then perform step 2 two;
Step 2 one, then this node exit and select main procedure;
Step 2 two, then this node, after adjusting frequency, return execution step 2;
Step 3, the node counter numerical value seizing channel is added 1, whether the number of times that now this node seizing channel judges to send correcting frequency deviation frame reaches and expection sends the number of times of correcting frequency deviation frame; If judged result is no, then return execution step 2; If judged result is yes, then this node seizing channel will become host node in net.
2. low pressure power line communication system frequency deviation according to claim 1 is corrected and host node choosing method automatically, it is characterized in that before step 2, and the node receiving beacon frame judges whether correctly to resolve beacon frame, if judged result is yes, then terminates; If judged result is no, then perform the process chosen of host node in the correcting frequency offset of step 2 to three and net.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242058A (en) * | 2021-05-17 | 2021-08-10 | 广东电网有限责任公司 | Low-voltage power line communication deviation rectifying and main selecting method and device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103428089A (en) * | 2012-05-16 | 2013-12-04 | 深圳市金正方科技有限公司 | Method and system for optimizing low-voltage power line carrier communication network |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103428089A (en) * | 2012-05-16 | 2013-12-04 | 深圳市金正方科技有限公司 | Method and system for optimizing low-voltage power line carrier communication network |
Non-Patent Citations (3)
| Title |
|---|
| XIAOSHENG LIU: "《A High-Reliability and Determinacy Architecture for Smart Substation Process-Level Network Based on Cobweb Topology》", 《IEEE》 * |
| 刘晓胜等: "《基于蛛网的新型电力线通信组网算法及通信协议》", 《电力系统保护与控制》 * |
| 孙毅等: "《基于频偏估计的无线传感器网络时间同步算法》", 《通信学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113242058A (en) * | 2021-05-17 | 2021-08-10 | 广东电网有限责任公司 | Low-voltage power line communication deviation rectifying and main selecting method and device |
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