CN101944937B - Power carrier communication system and method - Google Patents
Power carrier communication system and method Download PDFInfo
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Abstract
The invention relates to a power carrier communication system and a method. The system comprises a concentrator and at least one terminal which are connected through a power line and used for carrying out carrier communication, wherein the concentrator and the terminals all comprise a microcontroller, a clock, a memory and a carrier communication module; each carrier communication module comprises at least two switchable modulation frequencies; the memories on the concentrator and the terminals all save a time interval modulation frequency configuration table; and the microcontrollers on the concentrator and the terminals select the modulation frequencies of the carrier communication modules through reading the information of the time interval modulation frequency configuration table. Thecommunication system usually requires that all the terminals at least can successfully communicate once within a specific communication period, and the unsuccessfully communicated terminals carry outcomplementary communication in subsequent time. If different modulation frequencies can be changed within a communication period for communication, noise interference on some modulation frequencies can be effectively avoided so as to effectively improve the communication success rate.
Description
Technical Field
The present invention relates to a communication system and method, and more particularly, to a system and method using power line communication.
Background
In a meter reading system such as a water meter, an electricity meter and/or a gas meter realized by power line communication, noise interference exists on a carrier communication channel due to irregular use of electrical equipment, and the noise has a great influence on the communication effect of the power line carrier communication.
The power line carrier communication device can usually support a plurality of modulation frequencies, but only one frequency can be selected for communication at the same time, and two communication parties can successfully communicate only by adopting the same modulation frequency.
The existing meter reading system usually selects a modulation frequency artificially during system design, and the communication frequency cannot be changed after the device is installed on the site. The power carrier concentrator communicates with each power carrier terminal in a timed polling manner, and once a fixed noise source interferes with the selected modulation frequency at an installation site, the communication of the whole system may be completely broken down.
Therefore, the existing system is difficult to adapt to complicated and variable field environments.
Disclosure of Invention
An object of the present invention is to provide a power line carrier communication system, which is capable of periodically performing statistical analysis on communication quality and strategically performing dynamic selection of carrier modulation frequencies, so as to effectively avoid noise interference on some modulation frequencies and significantly improve communication success rate.
In order to achieve the above object, the present invention provides a power line carrier communication system, including a concentrator and at least one terminal, which are connected together through a power line and perform carrier communication, where the concentrator and the terminal both include a microcontroller, a clock, a memory, and a carrier communication module, the carrier communication module includes at least two switchable modulation frequencies, time-interval modulation frequency configuration tables are stored in the memories on the concentrator and the terminal, and the microcontrollers on the concentrator and the terminal select the modulation frequency of the carrier communication module by reading information of the time-interval modulation frequency configuration tables.
Further, in order to achieve the above object, the present invention provides a power line carrier communication method, in which a concentrator and at least one terminal are connected together through a power line to perform carrier communication, a microcontroller, a clock, a memory and a carrier communication module are provided on the concentrator and the terminal, the carrier communication module has at least two switchable modulation frequencies, a time-interval modulation frequency configuration table is stored in the memory on the concentrator and the terminal, and the microcontroller on the concentrator and the terminal selects a modulation frequency of the carrier communication module by reading information of the time-interval modulation frequency configuration table.
The time interval modulation frequency configuration table comprises a plurality of records, and each record comprises the start and stop time of a time interval and the modulation frequency adopted by the time interval.
All modulation frequencies of the carrier communication module occur at least once in the slot modulation frequency configuration table.
The concentrator periodically counts the total communication success rate of the system in each time period, updates the time period modulation frequency configuration table when the total communication success rate of at least one time period is lower than a set threshold value, and sends the updated time period modulation frequency to all terminals communicating with the time period modulation frequency configuration table.
And the microcontrollers on the concentrator and the terminal select the modulation frequency of the carrier communication module by reading the information of the updated time interval modulation frequency configuration table.
When the total communication success rate of a time interval is lower than a set threshold value, the concentrator adjusts the modulation frequency selected by the time interval according to a strategy.
The strategy for the concentrator to adjust is to select a modulation frequency which has not been used before to rewrite the modulation frequency content in the record corresponding to the time interval if the modulation frequency which has not been used before exists in the time interval, otherwise, to rewrite the modulation frequency content in the record corresponding to the time interval in the modulation frequency configuration table of the future time interval in the concentrator and all terminals by using the modulation frequency which has the highest historical success rate of the overall communication of the time interval, and to set the modulation frequency configuration table of the future time interval to be enabled at the specified time in the future.
The concentrator periodically synchronizes the clocks on all terminals with which it communicates.
Compared with the prior art, the invention has the following beneficial effects:
the communication system generally requires that all terminals can successfully communicate at least once in a specific communication period, and terminals which do not successfully communicate will perform supplementary communication in a subsequent time. If different modulation frequencies can be changed in one communication period for communication, noise interference on some modulation frequencies can be effectively avoided, and the communication success rate is obviously improved.
Drawings
Fig. 1 is a block diagram of a power carrier communication system according to the present invention.
Fig. 2 is an example of a time-slot modulation frequency configuration table in the power carrier communication system of the present invention.
Fig. 3 is a flowchart of modulation frequency selection according to a time-slot modulation frequency configuration table in the power carrier communication system of the present invention.
Fig. 4 is a flowchart of periodically optimizing a time-slot modulation frequency configuration table in the power line carrier communication system according to the present invention.
Detailed Description
For further explanation of the principles and construction of the present invention, reference will now be made in detail to the preferred embodiments of the present invention, which are illustrated in the accompanying drawings.
As shown in fig. 1, the power carrier communication system of the present invention includes a power carrier concentrator 1, a plurality of power carrier terminals 2 connected to the power carrier concentrator via a power line and performing carrier communication, and a management center 3 connected to the concentrator 2 in communication.
The internal structure of the concentrator 1 comprises a microcontroller, a clock, a memory, a carrier communication module and the like, the carrier communication module comprises a plurality of switchable modulation frequencies, the memory stores a time interval modulation frequency configuration table, the time interval modulation frequency configuration table, as shown in fig. 2, comprises a plurality of records, each record comprises the starting and ending time of a time interval and the modulation frequency adopted by the time interval, wherein the carrier communication module supports three modulation frequencies of F1, F2 and F3, and the day is divided into seven time intervals.
Similarly, the internal structure of the terminal 2 also includes a microcontroller, a clock, a memory, a carrier communication module including a plurality of switchable modulation frequencies, and the like, and the memory holds a time-period modulation frequency configuration table as shown in fig. 2.
The time interval modulation frequency distribution principle of the invention is as follows: each time segment is assigned a modulation frequency that minimizes interference during that time segment. The number of time periods per day is greater than or equal to the maximum number of modulation frequencies supported by the carrier communication module. Each modulation frequency is assigned at least one time period, and modulation frequencies with relatively low interference are assigned relatively long time periods.
The communication success rate is the percentage of the number of terminals 2 that successfully communicate at least once in a communication period to the total number of terminals 2.
Therefore, one communication cycle is divided into different time periods, different communication modulation frequencies are adopted in the different time periods, and the same modulation frequency is adopted by both communication parties in the same time period, so that the overall communication success rate of the system in one cycle is improved.
The communication cycle refers to a fixed-length time period, such as: one day.
The concentrator 1 and all the terminals 2 of the communication system are able to manage their own clock calendars and the concentrator 1 is able to automatically synchronize the clocks of all the terminals 2.
The concentrator 1 and all the terminals 2 automatically adjust the carrier modulation frequency adopted by the communication according to the allocation rule of the appointed time interval modulation frequency configuration table. All concentrators 1 and all terminals 2 in the system must adhere to the same convention, ensuring that the same modulation frequency is used at the same time.
The time-interval modulation frequency in the power carrier communication system is configured with two schemes:
scheme one
1) A uniform time interval modulation frequency configuration table is set when the concentrator 1 and all the terminals 2 leave a factory;
2) the concentrator 1 synchronizes the clocks of all the terminals 2 once a day;
3) when the system is operated in the field, the concentrator 1 and all the terminals 2 in the system uniformly follow the algorithm shown in fig. 3 to determine the carrier communication modulation frequency adopted at the current moment. Wherein,
n represents the total number of time periods of a day;
i: time interval sequence number, value range: i is more than or equal to 0 and less than N;
t (i) represents the end time of period i;
f (i) represents the carrier communication modulation frequency employed in time period i;
fdef represents the default carrier communication modulation frequency of the system;
t represents the current time of the system;
f denotes the modulation frequency currently employed for system communication.
The method has simple software algorithm and can meet the requirements of most field applications.
Scheme two
1) A uniform time interval modulation frequency configuration table is set when the concentrator 1 and all the terminals 2 leave a factory;
2) the concentrator 1 synchronizes the clocks of all the terminals 2 once a day;
3) when the system runs on site, the concentrator 1 and all the terminals 2 in the system uniformly follow the algorithm in the first embodiment to determine the carrier communication modulation frequency adopted at the current moment;
4) meanwhile, the time interval modulation frequency configuration table of the system is optimized periodically.
The time-interval modulation frequency optimization algorithm, as shown in fig. 4, includes:
1. the concentrator 1 counts and records the communication success rate of the current modulation frequency in each time interval;
2. the concentrator 1 and all the terminals 2 check their own time, and once the valid future period modulation frequency profile switching time is reached, overwrite the future period modulation frequency profile with the current period modulation frequency profile and immediately enable the new period modulation frequency profile.
3. If three days have passed since the last switching period modulation frequency configuration table time swt, proceed to the next step; otherwise, returning to the step 1;
4. the time period with the lowest communication success rate is marked as T (k), and if the communication success rate is lower than a set threshold (for example, 70%), the next step is executed; otherwise, returning to the step 1;
5. if the time interval has unused modulation frequency, selecting an unused modulation frequency for the time interval, and recording as F (j); otherwise, selecting a modulation frequency with the highest historical communication success rate in the period, which is marked as F (x);
6. the concentrator 1 updates its own future period modulation frequency configuration table and the future period modulation frequency configuration tables of all the terminals 2, and updates only the modulation frequency of the period t (k) to be f (j) or f (x) (depending on the result of step 5);
7. the concentrator 1 sets the switching time of the future period modulation frequency profile of itself and all terminals 2 to a certain future time, denoted swt, and returns to step 1.
In this way, all the carrier devices (the concentrator 1 and all the terminals 2) support the present-period modulation frequency profile table and the future-period modulation frequency profile table, and can switch the future-period modulation frequency profile table to the present-period modulation frequency profile table at a specified timing. The unified current and future time interval modulation frequency configuration tables are set when the equipment leaves a factory, the future time interval modulation frequency configuration tables are allowed to be changed after leaving the factory, and the future time interval modulation frequency configuration tables can be started at a specified time. When the communication success rate of the system does not meet the requirement, the concentrator 1 automatically learns the modulation frequency allocation scheme in the adjustment period, and starts a new modulation frequency allocation scheme by the method so as to gradually improve the communication success rate of the system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, so that equivalent structural changes made by using the contents of the present specification and the accompanying drawings are included in the scope of the present invention.
Claims (1)
1. A power line carrier communication system comprises a concentrator and at least one terminal which are connected together through a power line and carry out carrier communication, wherein the concentrator and the terminal respectively comprise a microcontroller, a clock, a memory and a carrier communication module, the carrier communication module comprises at least two switchable modulation frequencies, the power line carrier communication system is characterized in that the memory on the concentrator and the terminal respectively stores a time interval modulation frequency configuration table, the microcontroller on the concentrator and the terminal selects the modulation frequency of the carrier communication module by reading the information of the time interval modulation frequency configuration table, the time interval modulation frequency configuration table comprises a plurality of records, each record comprises the start and stop time of a time interval and the modulation frequency adopted by the time interval, and all the modulation frequencies of the carrier communication module at least appear once in the time interval modulation frequency configuration table, the concentrator periodically counts the total communication success rate of the system in each time period, updates the modulation frequency configuration tables of the concentrator and all terminals in the future time period when the total communication success rate of at least one time period is lower than a set threshold value, and requires all terminals and the concentrator to start a new modulation frequency configuration table in the future designated time.
2.The power-line carrier communication system according to claim 1, wherein the microcontrollers at the concentrator and the terminal enable the future-period modulation frequency configuration table to be the current-period modulation frequency configuration table when the switching time of the future-period modulation frequency configuration table comes, and select the modulation frequency of the carrier communication module by reading the information of the updated period modulation frequency configuration table.
3. The plc system of claim 1, wherein the concentrator adjusts the modulation frequency selected for a period of time according to a policy when the overall communication success rate of the period of time is lower than a predetermined threshold.
4. A power line carrier communication system according to claim 3 wherein the concentrator adapts by selecting a previously unused modulation frequency to overwrite the modulation frequency content in the time period corresponding record of the future time period modulation frequency profile if there is a previously unused modulation frequency in the time period, and otherwise overwriting the modulation frequency content in the time period corresponding record of the time period modulation frequency profile with a modulation frequency that has historically the highest overall communication success rate for the time period.
5. The power-line carrier communication system according to claim 4, wherein the concentrator periodically synchronizes clocks on all terminals communicating therewith.
6. A power line carrier communication method, a concentrator and at least one terminal are connected together through a power line for carrying out carrier communication, a microcontroller, a clock, a memory and a carrier communication module are arranged on the concentrator and the terminal, the carrier communication module is provided with at least two switchable modulation frequencies, the method is characterized in that a time interval modulation frequency configuration table is stored in the memories on the concentrator and the terminal, the microcontroller on the concentrator and the terminal selects the modulation frequency of the carrier communication module by reading the information of the time interval modulation frequency configuration table, the time interval modulation frequency configuration table comprises a plurality of records, each record comprises the starting and ending time of a time interval and the modulation frequency adopted by the time interval, and all the modulation frequencies of the carrier communication module appear in the time interval modulation frequency configuration table at least once, the concentrator periodically counts the total communication success rate of the system in each time period, updates the modulation frequency configuration tables of the concentrator and all terminals in the future time period when the total communication success rate of at least one time period is lower than a set threshold value, and requires all terminals and the concentrator to start a new modulation frequency configuration table in the future designated time.
7. The power-line carrier communication method according to claim 6, wherein the microcontrollers at the concentrator and the terminal enable the future-period modulation frequency configuration table to be the current-period modulation frequency configuration table when the switching time of the future-period modulation frequency configuration table comes, and select the modulation frequency of the carrier communication module by reading the information of the updated period modulation frequency configuration table.
8. The plc method according to claim 6, wherein the concentrator adjusts the modulation frequency selected in a time period according to a policy when the total communication success rate in the time period is lower than a predetermined threshold.
9. The power-line carrier communication method as claimed in claim 8, wherein the concentrator adjusts the modulation frequency by selecting a modulation frequency that has not been used previously to overwrite the modulation frequency content in the time-slot corresponding record in the future time-slot modulation frequency profile if the time-slot has a modulation frequency that has not been used previously, and overwriting the modulation frequency content in the time-slot corresponding record in the time-slot modulation frequency profile with a modulation frequency that has historically been the highest in the overall communication success rate for the time-slot.
10. The power-line carrier communication method according to claim 9, wherein the concentrator periodically synchronizes clocks at all terminals communicating therewith.
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| CN 200910151279 CN101944937B (en) | 2009-07-01 | 2009-07-01 | Power carrier communication system and method |
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| CN103607224B (en) * | 2013-12-02 | 2015-09-23 | 国家电网公司 | Set up the method for power-line carrier communication system two-way link |
| CN105490768B (en) * | 2015-11-18 | 2018-11-30 | 积成电子股份有限公司 | A kind of automatic calibrating method of concentrator clock chip |
| CN106781391A (en) * | 2016-12-29 | 2017-05-31 | 天津铁研智能技术有限公司 | A kind of remote wireless meter recording and transmission method |
| CN110400452A (en) * | 2019-08-07 | 2019-11-01 | 广州物道水务科技有限公司 | A kind of communication means, device and equipment |
| CN111490850B (en) * | 2020-03-09 | 2023-05-16 | 上海联虹技术有限公司 | Communication device data transmission control method, system, device and storage medium |
| CN114071253B (en) * | 2021-09-30 | 2023-11-07 | 宁波三星智能电气有限公司 | Method suitable for rapid networking pairing during networking module production |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006096987A1 (en) * | 2005-03-16 | 2006-09-21 | Domosys Corporation | System and method for power line communications |
| CN101217772A (en) * | 2008-01-02 | 2008-07-09 | 江苏省电力公司 | An optimization method for special network resources of 230MHz |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006096987A1 (en) * | 2005-03-16 | 2006-09-21 | Domosys Corporation | System and method for power line communications |
| CN101217772A (en) * | 2008-01-02 | 2008-07-09 | 江苏省电力公司 | An optimization method for special network resources of 230MHz |
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