CN116961698B - Distributed photovoltaic-based power distribution network carrier communication method and system - Google Patents
Distributed photovoltaic-based power distribution network carrier communication method and system Download PDFInfo
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- 238000004891 communication Methods 0.000 title claims abstract description 111
- 238000009826 distribution Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000010248 power generation Methods 0.000 claims abstract description 221
- 238000012360 testing method Methods 0.000 claims abstract description 176
- 230000008859 change Effects 0.000 claims abstract description 15
- 230000003993 interaction Effects 0.000 claims abstract description 14
- 238000000926 separation method Methods 0.000 claims abstract description 7
- 238000012163 sequencing technique Methods 0.000 claims description 6
- 239000000969 carrier Substances 0.000 claims description 5
- 230000005540 biological transmission Effects 0.000 abstract description 3
- 230000008569 process Effects 0.000 description 8
- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 4
- 238000003860 storage Methods 0.000 description 3
- 230000005059 dormancy Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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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
- H04B3/544—Setting up communications; Call and signalling arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0823—Errors, e.g. transmission errors
- H04L43/0829—Packet loss
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
Abstract
The invention discloses a distributed photovoltaic-based power distribution network carrier communication method and system, comprising the following steps: the main control terminal receives the identification code of the demodulation power generation terminal in the public frequency band and acquires the test frequency band of the power generation terminal; the main control terminal modulates and transmits test information of carrier frequency change to the power generation terminal to obtain a relation between a reliable communication code rate and carrier frequency between the main control terminal and the power generation terminal, wherein the test information comprises identification codes of the power generation terminal; distributing the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end, and transmitting the carrier frequency band to the corresponding power generation end; and carrying out frequency separation identification according to the carrier frequency range of each power generation end, and carrying out information interaction with the corresponding power generation end. According to the invention, a special communication line is not required to be newly built, parallel reliable communication interaction between the main control terminal and the plurality of distributed power generation terminals can be realized by using the power transmission line, and the reliability of the distributed power carrier communication network in a high concurrency state is maintained.
Description
Technical Field
The invention belongs to the technical field of carrier communication, and particularly relates to a distributed photovoltaic-based carrier communication method and system for a power distribution network.
Background
Distributed photovoltaic power generation has gained widespread attention and rapid development in recent years as a clean energy source. The distributed photovoltaic power generation system installs photovoltaic cell panels on a building roof, a wall surface and other distributed scenes, and is connected with a power distribution network through a grid-connected inverter, so that effective utilization of electric energy is realized. However, the widespread use of distributed photovoltaic power generation systems also presents a series of technical challenges, such as stability, efficiency, safety, etc. of the system operation.
In order to control the stable, efficient and safe operation of the distributed photovoltaic power generation end, stable and reliable communication needs to be established between the photovoltaic power generation end and the main control end, photovoltaic power generation is usually built in the form of large-scale photovoltaic power board clusters, the number of independent power generation ends of a medium-scale photovoltaic power station can easily exceed tens of thousands, stable and efficient control of the power generation end comprising the photovoltaic power board needs to establish efficient and stable communication between the power generation end and the main control end, but the construction and maintenance cost of using a special wired or wireless communication line is high, and if the special communication line is established, the cost is huge.
Disclosure of Invention
In order to solve the problems, the invention provides a distributed photovoltaic-based power distribution network carrier communication method and system, which realize parallel and reliable communication interaction between a main control terminal and a plurality of distributed power generation terminals.
The technical scheme adopted for solving the technical problems is as follows:
a distributed photovoltaic-based power distribution network carrier communication method comprises the following steps:
the main control terminal receives the identification code of the demodulation power generation terminal in the public frequency band and acquires the test frequency band of the power generation terminal;
the main control terminal modulates and transmits test information of carrier frequency change to the power generation terminal to obtain a relation between a reliable communication code rate and carrier frequency between the main control terminal and the power generation terminal, wherein the test information comprises identification codes of the power generation terminal;
distributing the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end, and transmitting the carrier frequency band to the corresponding power generation end;
and carrying out frequency separation identification according to the carrier frequency range of each power generation end, and carrying out information interaction with the corresponding power generation end.
A distributed photovoltaic-based carrier communication system for a power distribution network, comprising:
the information acquisition module is used for receiving the identification code of the demodulation power generation end at the public frequency band by the main control end and acquiring the test frequency band of the power generation end;
the test module is used for modulating and transmitting test information of carrier frequency change to the power generation end by the main control end to obtain the relation between the reliable communication code rate and the carrier frequency between the main control end and the power generation end, wherein the test information comprises identification codes of the power generation end;
the frequency band allocation module is used for allocating the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end and sending the carrier frequency band to the corresponding power generation end;
and the carrier communication module performs frequency separation identification according to the carrier frequency band of each power generation end and performs information interaction with the corresponding power generation end.
The technical scheme of the embodiment of the invention has the following beneficial effects:
(1) The carrier communication wave bands of the power generation ends are distributed according to the receiving and transmitting states of the test information between each power generation end and the main control end, a new communication special line is not needed, and meanwhile, the reliability of the distributed power carrier communication network in a high concurrency state is maintained;
(2) The main control end sends test information to the power generation end twice, and the density of the test frequency is increased through the secondary test, so that the fitting accuracy of the packet loss rate of the test information about the carrier frequency relation can be improved;
(3) The carrier frequency band which is not used for a long time due to dormancy of the power generation end is recovered, so that the channel utilization rate is effectively improved.
According to the invention, a special communication line is not required to be newly built, parallel reliable communication interaction between the main control terminal and the plurality of distributed power generation terminals can be realized by using the power transmission line, and the reliability of the distributed power carrier communication network in a high concurrency state is maintained.
Drawings
FIG. 1 is a flow chart illustrating a distributed photovoltaic-based power distribution network carrier communication method according to an exemplary embodiment;
fig. 2 is a schematic diagram illustrating a distributed photovoltaic-based carrier communication system for a power distribution network, according to an exemplary embodiment.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
in order to clearly illustrate the technical features of the present solution, the present invention will be described in detail below with reference to the following detailed description and the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different structures of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily obscure the present invention.
As shown in fig. 1, the carrier communication method for a power distribution network based on distributed photovoltaic provided by the embodiment of the invention comprises the following steps:
step one: the main control terminal receives the identification code of the demodulation power generation terminal in the public frequency band and acquires the test frequency band of the power generation terminal.
The power generation end modulates and transmits the identification code to the main control end in the public frequency band in the process of supplying power to the main control end, and the main control end receives the power supply of the power generation end and then receives and demodulates the identification code of the power generation end in the public frequency band.
In this process, modulation (Modulation) and Demodulation (Demodulation) are two very important links, modulation (Modulation): modulation is a process performed at the transmitting end that converts the original data signal (digital or analog) into a high frequency signal suitable for transmission over a power line. The purpose of the modulator is to combine the data signal with the carrier signal so that the data signal can be transmitted over the power line; in the present embodiment, amplitude keying (ASK), frequency keying (FSK), phase keying (PSK), quadrature Amplitude Modulation (QAM), and the like can be used for signal modulation. Demodulation (Demodulation): demodulation is a process performed at the receiving end that restores the modulated high frequency signal to the original data signal. The purpose of the demodulator is to extract the carrier signal from the power line and restore it to a data signal for further processing and analysis. The demodulator needs to use the same modulation technique as the modulator at the transmitting end in order to correctly decode the signal.
Acquiring the frequency range of carrier information interaction with all power generation ends to obtain all available frequency bands; and taking all the available frequency bands as test frequency bands of the power generation end, wherein the common frequency band is not in the test frequency bands.
Step two: the main control end modulates and sends test information of carrier frequency change to the power generation end to obtain the relation between the reliable communication code rate and the carrier frequency between the main control end and the power generation end, wherein the test information comprises identification codes of the power generation end.
And uniformly selecting a plurality of frequencies at intervals in the test frequency band as primary test frequencies, respectively modulating carriers on the primary test frequencies by test information, transmitting the primary test frequencies to the power generation end, and obtaining the relation of the packet loss rate of the primary test information with respect to the carrier frequencies according to the packet loss rate feedback information of the power generation end.
Because the density of the primary test is limited, in order to more accurately fit the relation of the packet loss rate of the test information with respect to the carrier frequency, the density of the test frequency is increased by increasing the secondary test, so that the fitting accuracy of the relation of the packet loss rate of the test information with respect to the carrier frequency is improved, the secondary test is performed according to the primary test result, and the relation of the packet loss rate of the secondary test with respect to the carrier frequency is obtained, and the method comprises the following steps:
obtaining the difference value of the packet loss rates of the test information corresponding to the two adjacent primary test frequencies according to the relation between the primary test information packet loss rate and the primary test frequency; selecting a plurality of frequencies as secondary test frequencies in the test frequency band according to the difference value of the packet loss rate of the test information corresponding to the two adjacent primary test frequencies; and modulating carrier waves of the test information on a plurality of secondary test frequencies respectively, sending the modulated carrier waves to the power generation end, and receiving the relation of the packet loss rate of the test information fed back by the power receiving end with respect to the secondary test frequencies.
Meanwhile, in order to improve the effect of the secondary test, the secondary test frequency needs to be screened, including:
when secondary test frequencies are selected, a frequency band between two adjacent primary test frequencies in the test frequency band is used as a test interval frequency band, and the difference value of the packet loss rate of the test information corresponding to each test interval frequency band is obtained and used as the frequency hopping packet loss change rate of the test interval frequency band;
calculating and obtaining the reciprocal of the frequency hopping packet loss change rate of each test interval frequency band as a secondary distribution coefficient of each test interval frequency band;
obtaining the total number of the secondary test frequencies, and distributing the total number of the secondary test frequencies to each test interval frequency band according to the proportion between the secondary distribution coefficients of each test interval frequency band to obtain the number of the secondary test frequencies in each test interval frequency band;
uniformly distributing the number of the secondary test frequencies in each test interval frequency band in the corresponding test interval frequency band to obtain a plurality of secondary test frequencies.
And finally, fitting a relation of the twice test packet loss rate with respect to the carrier frequency, and obtaining a relation between the reliable communication code rate and the carrier frequency between the power generation end according to the relation of the packet loss rate of the test information with respect to the carrier frequency.
Step three: and distributing the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end, and transmitting the carrier frequency band to the corresponding power generation end.
Acquiring anti-interference interval frequency of parallel carrier communication, and sequentially arranging the power generation ends according to the moment of receiving identification codes of the power generation ends for the first time to obtain the access sequence of each power generation end;
obtaining an optimal carrier frequency band and a plurality of alternative carrier frequency bands of each power generation end according to the relation between the reliable communication code rate and the carrier frequency of each power generation end and the anti-interference interval frequency; when the optimal carrier frequency band and the alternative carrier frequency band are selected, setting a screening threshold value of the reliable communication code rate, wherein the carrier frequency band with the carrier frequency with the highest reliable communication code rate in the order of the reliable communication code rate can be used as the optimal carrier frequency band according to the actual situation, or the carrier frequency band with the largest average reliable communication code rate of the carrier frequency can be used as the optimal carrier frequency band, and the rest carrier frequency bands are set as the alternative carrier frequency bands;
the optimal carrier frequency band of the power generation end sequenced in front is preferentially used as the carrier frequency band of the power generation end according to the access sequence of each power generation end;
judging whether the optimal carrier frequency band of the newly accessed power generation end conflicts with the carrier frequency band of the power generation end with the previous access sequence;
if so, taking an alternative carrier frequency band which does not conflict with the carrier frequency band of the power generation end with the previous access sequence in the alternative carrier frequency band of the newly accessed power generation end as a carrier frequency band; if not, finally taking the optimal carrier frequency band of the newly accessed power generation end as the carrier frequency band; when the newly connected power generation end collides with the carrier frequency bands of the power generation end with the prior sequence, selecting the alternative carrier frequency band with the prior average reliable communication code rate sequence as the carrier frequency band of the newly connected power generation end, and if the alternative carrier frequency band is still occupied, sequentially selecting according to the average reliable communication code rate of the frequencies in the carrier frequency band.
Step four: and carrying out frequency separation identification according to the carrier frequency range of each power generation end, and carrying out information interaction with the corresponding power generation end.
Because the power carrier communication frequency band resources are limited, the stable, reliable and efficient frequency band is more a scarce resource, in order to avoid long-time occupation of the power generation end which is not used for a long time, the carrier frequency band allocated to the dormant power generation end needs to be recovered, which comprises the following steps:
acquiring a communication time history record of each power generation end, and judging whether each power generation end is dormant or not according to the communication time history record of each power generation end;
if yes, then the carrier frequency band allocated to the dormant power generation end is recovered, and if not, the carrier frequency band allocated to the power generation end is kept.
The process of judging whether each power generation end is in a dormant state is as follows:
obtaining the distribution of the communication time of the power generation end according to the communication time history record of the power generation end, and obtaining the previous silence time of the last communication of the power generation end according to the communication time history record of the power generation end, wherein the previous silence time is the time interval from the last communication of the power generation end to the main control end for dormancy judgment;
obtaining the interval time of each communication of the power generation end according to the distribution of the communication time of the power generation end, and obtaining the maximum conventional communication interval time of the power generation end according to the interval time of each communication of the power generation end;
and judging whether the heretofore silent time of the power generation end exceeds the maximum normal communication interval time. If yes, judging that the power generation end is in a dormant state. If not, judging that the power generation end is not in the dormant state.
Because the information interaction states of each power generation end are different, specific judgment is needed to be carried out on each power generation end by combining the interval time of each communication, and the process of solving the maximum conventional communication interval time of each power generation end is as follows:
sequencing the interval time of each communication of the power generation end according to the numerical value to obtain an interval time sequencing table;
for each interval time in the interval time sequencing table, acquiring a mean value of differences between each interval time and adjacent interval time as a reference difference value;
taking the interval time with the difference value smaller than the reference difference value as the conventional communication interval time of the power generation end;
and taking the maximum value of the conventional communication interval time of the power generation end as the maximum conventional communication interval time of the power generation end.
If the interval time sequence table of each communication of the generating end with the identification code id of 1 is [1,3,6,9,12,18,25], the interval time sequence table of each communication of the generating end with the identification code id of 2 is [1,4,7,10,13,20,30], and the interval time sequence table of each communication of the generating end with the identification code id of 3 is [2,5,8,11,14,22,35], the reference difference values of the three generating ends are 11, 12 and 14 respectively.
After screening the adjacent interval time smaller than the reference difference value, the conventional communication interval time of the power generation end with id of 1 is [1,3,6,9], the conventional communication interval time of the power generation end with id of 2 is [1,4,7,10], and the conventional communication interval time of the power generation end with id of 3 is [2,5,8,11,14], so that the maximum conventional communication interval time of the three power generation ends is 9,10 and 14 respectively, and when the previous silence time of the three power generation ends is greater than 9,10 and 14 respectively, the corresponding power generation end is judged to enter a dormant state, and the carrier frequency band allocated to the dormant power generation end is recovered.
As shown in fig. 2, a carrier communication system of a power distribution network based on distributed photovoltaic provided by an embodiment of the present invention includes:
the information acquisition module is used for receiving the identification code of the demodulation power generation end at the public frequency band by the main control end and acquiring the test frequency band of the power generation end;
the test module is used for modulating and transmitting test information of carrier frequency change to the power generation end by the main control end to obtain the relation between the reliable communication code rate and the carrier frequency between the main control end and the power generation end, wherein the test information comprises identification codes of the power generation end;
the frequency band allocation module is used for allocating the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end and sending the carrier frequency band to the corresponding power generation end;
and the carrier communication module performs frequency separation identification according to the carrier frequency band of each power generation end and performs information interaction with the corresponding power generation end.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (5)
1. The carrier communication method of the power distribution network based on the distributed photovoltaic is characterized by comprising the following steps of:
the main control terminal receives the identification code of the demodulation power generation terminal in the public frequency band and acquires the test frequency band of the power generation terminal;
the main control terminal modulates and transmits test information of carrier frequency change to the power generation terminal to obtain a relation between a reliable communication code rate and carrier frequency between the main control terminal and the power generation terminal, wherein the test information comprises identification codes of the power generation terminal;
distributing the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end, and transmitting the carrier frequency band to the corresponding power generation end;
frequency separation identification is carried out according to the carrier frequency range of each power generation end, and information interaction is carried out with the corresponding power generation end;
obtaining a test frequency band of a power generation end comprises the following steps:
acquiring the frequency range of carrier information interaction with all power generation ends to obtain all available frequency bands;
taking all available frequency bands as test frequency bands of a power generation end;
the main control end modulates and transmits the test information of the carrier frequency change to the power generation end to obtain the relation between the reliable communication code rate and the carrier frequency between the main control end and the power generation end, and the method comprises the following steps:
selecting a plurality of frequencies as primary test frequencies at uniform intervals in a test frequency band, respectively modulating carriers on the primary test frequencies by test information, sending the modulated carriers to a power generation end, and obtaining the relation of the packet loss rate of the primary test information on the carrier frequencies according to the packet loss rate feedback information of the power generation end;
performing secondary test according to the primary test result to obtain the relation of the secondary test information packet loss rate on the carrier frequency;
fitting the relation of the packet loss rate of the twice test information with respect to the carrier frequency, and obtaining the relation between the reliable communication code rate and the carrier frequency between the two test information and the power generation end according to the relation of the packet loss rate of the test information with respect to the carrier frequency;
performing a secondary test according to the primary test result to obtain a relationship of the secondary test information packet loss rate with respect to the carrier frequency, including:
obtaining the difference value of the packet loss rates of the test information corresponding to the two adjacent primary test frequencies according to the relation between the primary test information packet loss rate and the primary test frequency;
selecting a plurality of frequencies as secondary test frequencies in the test frequency band according to the difference value of the packet loss rate of the test information corresponding to the two adjacent primary test frequencies;
modulating carrier waves of the test information on a plurality of secondary test frequencies respectively, sending the modulated carrier waves to a power generation end, and receiving the relation of the packet loss rate of the test information fed back by the power generation end with respect to the secondary test frequencies;
the selecting a number of frequencies as secondary test frequencies includes:
taking a frequency band between two adjacent primary test frequencies in the test frequency band as a test interval frequency band, and acquiring a difference value of packet loss rates of test information corresponding to each test interval frequency band as a frequency hopping packet loss change rate of the test interval frequency band;
calculating and obtaining the reciprocal of the frequency hopping packet loss change rate of each test interval frequency band as a secondary distribution coefficient of each test interval frequency band;
obtaining the total number of the secondary test frequencies, and distributing the total number of the secondary test frequencies to each test interval frequency band according to the proportion between the secondary distribution coefficients of each test interval frequency band to obtain the number of the secondary test frequencies in each test interval frequency band;
uniformly distributing the number of secondary test frequencies in each test interval frequency band in the corresponding test interval frequency band to obtain a plurality of secondary test frequencies;
the allocating the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end comprises the following steps:
acquiring anti-interference interval frequency of parallel carrier communication, and sequentially arranging the power generation ends according to the moment of receiving identification codes of the power generation ends for the first time to obtain the access sequence of each power generation end;
obtaining an optimal carrier frequency band and a plurality of alternative carrier frequency bands of each power generation end according to the relation between the reliable communication code rate and the carrier frequency of each power generation end and the anti-interference interval frequency;
the optimal carrier frequency band of the power generation end sequenced in front is preferentially used as the carrier frequency band of the power generation end according to the access sequence of each power generation end;
judging whether the optimal carrier frequency band of the newly accessed power generation end conflicts with the carrier frequency band of the power generation end with the previous access sequence;
if so, taking an alternative carrier frequency band which does not conflict with the carrier frequency band of the power generation end with the previous access sequence in the alternative carrier frequency band of the newly accessed power generation end as a carrier frequency band; and if the power generation terminal does not conflict, finally taking the optimal carrier frequency band of the newly accessed power generation terminal as the carrier frequency band.
2. The distributed photovoltaic-based carrier communication method for a power distribution network according to claim 1, further comprising determining a sleep state of each power generation end, comprising:
acquiring a communication time history record of each power generation end, and judging whether each power generation end is dormant or not according to the communication time history record of each power generation end;
if yes, then the carrier frequency band allocated to the dormant power generation end is recovered, and if not, the carrier frequency band allocated to the power generation end is kept.
3. The distributed photovoltaic-based carrier communication method for a power distribution network according to claim 2, wherein determining whether each power generation end is dormant according to the communication time history of each power generation end comprises:
obtaining the distribution of the communication time of the power generation end according to the communication time history of the power generation end, and obtaining the silence time of the last communication of the power generation end according to the communication time history of the power generation end;
obtaining the interval time of each communication of the power generation end according to the distribution of the communication time of the power generation end, and obtaining the maximum conventional communication interval time of the power generation end according to the interval time of each communication of the power generation end;
judging whether the silence time of the power generation end exceeds the maximum conventional communication interval time; if yes, judging that the power generation end is in a dormant state; if not, judging that the power generation end is not in the dormant state.
4. A distributed photovoltaic-based carrier communication method for a power distribution network according to claim 3, wherein the obtaining the maximum regular communication interval time of the power generation end according to the interval time of each communication of the power generation end comprises the following steps:
sequencing the interval time of each communication of the power generation end according to the numerical value to obtain an interval time sequencing table;
for each interval time in the interval time sequencing table, acquiring a mean value of differences between each interval time and adjacent interval time as a reference difference value;
taking the interval time with the difference value smaller than the reference difference value as the conventional communication interval time of the power generation end;
and taking the maximum value of the conventional communication interval time of the power generation end as the maximum conventional communication interval time of the power generation end.
5. A distributed photovoltaic-based carrier communication system for a power distribution network, comprising:
the information acquisition module is used for receiving the identification code of the demodulation power generation end at the public frequency band by the main control end and acquiring the test frequency band of the power generation end;
obtaining a test frequency band of a power generation end comprises the following steps:
acquiring the frequency range of carrier information interaction with all power generation ends to obtain all available frequency bands;
taking all available frequency bands as test frequency bands of a power generation end;
the test module is used for modulating and transmitting test information of carrier frequency change to the power generation end by the main control end to obtain the relation between the reliable communication code rate and the carrier frequency between the main control end and the power generation end, wherein the test information comprises identification codes of the power generation end;
the main control end modulates and transmits the test information of the carrier frequency change to the power generation end to obtain the relation between the reliable communication code rate and the carrier frequency between the main control end and the power generation end, and the method comprises the following steps:
selecting a plurality of frequencies as primary test frequencies at uniform intervals in a test frequency band, respectively modulating carriers on the primary test frequencies by test information, sending the modulated carriers to a power generation end, and obtaining the relation of the packet loss rate of the primary test information on the carrier frequencies according to the packet loss rate feedback information of the power generation end;
performing secondary test according to the primary test result to obtain the relation of the secondary test information packet loss rate on the carrier frequency;
fitting the relation of the packet loss rate of the twice test information with respect to the carrier frequency, and obtaining the relation between the reliable communication code rate and the carrier frequency between the two test information and the power generation end according to the relation of the packet loss rate of the test information with respect to the carrier frequency;
performing a secondary test according to the primary test result to obtain a relationship of the secondary test information packet loss rate with respect to the carrier frequency, including:
obtaining the difference value of the packet loss rates of the test information corresponding to the two adjacent primary test frequencies according to the relation between the primary test information packet loss rate and the primary test frequency;
selecting a plurality of frequencies as secondary test frequencies in the test frequency band according to the difference value of the packet loss rate of the test information corresponding to the two adjacent primary test frequencies;
modulating carrier waves of the test information on a plurality of secondary test frequencies respectively, sending the modulated carrier waves to a power generation end, and receiving the relation of the packet loss rate of the test information fed back by the power generation end with respect to the secondary test frequencies;
the selecting a number of frequencies as secondary test frequencies includes:
taking a frequency band between two adjacent primary test frequencies in the test frequency band as a test interval frequency band, and acquiring a difference value of packet loss rates of test information corresponding to each test interval frequency band as a frequency hopping packet loss change rate of the test interval frequency band;
calculating and obtaining the reciprocal of the frequency hopping packet loss change rate of each test interval frequency band as a secondary distribution coefficient of each test interval frequency band;
obtaining the total number of the secondary test frequencies, and distributing the total number of the secondary test frequencies to each test interval frequency band according to the proportion between the secondary distribution coefficients of each test interval frequency band to obtain the number of the secondary test frequencies in each test interval frequency band;
uniformly distributing the number of secondary test frequencies in each test interval frequency band in the corresponding test interval frequency band to obtain a plurality of secondary test frequencies;
the frequency band allocation module is used for allocating the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end and sending the carrier frequency band to the corresponding power generation end;
the allocating the carrier frequency band of each power generation end according to the relation between the reliable communication code rate and the carrier frequency between the main control end and each power generation end comprises the following steps:
acquiring anti-interference interval frequency of parallel carrier communication, and sequentially arranging the power generation ends according to the moment of receiving identification codes of the power generation ends for the first time to obtain the access sequence of each power generation end;
obtaining an optimal carrier frequency band and a plurality of alternative carrier frequency bands of each power generation end according to the relation between the reliable communication code rate and the carrier frequency of each power generation end and the anti-interference interval frequency;
the optimal carrier frequency band of the power generation end sequenced in front is preferentially used as the carrier frequency band of the power generation end according to the access sequence of each power generation end;
judging whether the optimal carrier frequency band of the newly accessed power generation end conflicts with the carrier frequency band of the power generation end with the previous access sequence;
if so, taking an alternative carrier frequency band which does not conflict with the carrier frequency band of the power generation end with the previous access sequence in the alternative carrier frequency band of the newly accessed power generation end as a carrier frequency band; if not, finally taking the optimal carrier frequency band of the newly accessed power generation end as the carrier frequency band;
and the carrier communication module performs frequency separation identification according to the carrier frequency band of each power generation end and performs information interaction with the corresponding power generation end.
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