CN113746504B - Signal modulation and demodulation method for identifying topological relation of low-voltage distribution area - Google Patents
Signal modulation and demodulation method for identifying topological relation of low-voltage distribution area Download PDFInfo
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- CN113746504B CN113746504B CN202111039252.1A CN202111039252A CN113746504B CN 113746504 B CN113746504 B CN 113746504B CN 202111039252 A CN202111039252 A CN 202111039252A CN 113746504 B CN113746504 B CN 113746504B
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/063—Details of electronic electricity meters related to remote communication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
- G01R22/068—Arrangements for indicating or signaling faults
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
A signal modulation and demodulation method for identifying topological relation of a low-voltage distribution area comprises the following steps: s1: the fusion terminal communicates with the injection equipment in the platform region, issues a monitoring execution command, and when the injection equipment receives the command, formats the slave address table and starts execution monitoring; s2: after the injection equipment is completely started to execute monitoring, the fusion terminal sends an injection execution command to one of the injection equipment, and the equipment receiving the command performs data packet packing and encoding on a local address and then injects the local address into a line in a characteristic signal form; s3: if other injection equipment in the line monitors the characteristic signal, demodulating, decoding and verifying the characteristic signal and then storing the characteristic signal; s4: after the fusion terminal executes the operations on all the injection devices one by one, acquiring the slave address tables of the injection devices one by one; the injection equipment of the invention specifies the upstream equipment of the injection equipment by injecting the characteristic signal, thereby realizing the upstream and downstream relation of all the injection equipment in the transformer area.
Description
Technical Field
The invention belongs to the technical field of signal modulation, and particularly relates to a signal modulation and demodulation method for identifying topological relation of a low-voltage distribution area.
Background
The transformer is used for transmitting power to a power supply area on the side of a user electric meter, a large number of electric devices are connected in the transformer, the devices are arranged in various places in the transformer, wiring of the devices is complex, and the upstream and downstream relation is unclear. The topological relation of the line connection network of the equipment provides a crucial basis for the management and service of the electric power operation and management department, and provides a quick positioning function for the troubleshooting of the position of a line fault point, line loss and other problems.
Therefore, it is an urgent need to solve the problem of the art to provide a signal modulation and demodulation method for identifying the topological relation of the low-voltage distribution area to clarify the upstream and downstream relation of the electrical devices in the distribution area.
Disclosure of Invention
In view of this, the invention provides a signal modulation and demodulation method for identifying the topological relation of the low-voltage distribution area, which solves the problem that the upper and lower relations of each electrical device in the low-voltage distribution area are unknown, and provides a function of quickly positioning the position of a line fault point.
In order to achieve the purpose, the invention adopts the following technical scheme:
a signal modulation and demodulation method for identifying topological relation of a low-voltage transformer area comprises the following steps:
s1: the fusion terminal communicates with the injection equipment in the platform region, issues a monitoring execution command, and when the injection equipment receives the command, formats the slave address table and starts execution monitoring;
s2: after the injection devices are all started to execute monitoring, the fusion terminal sends an injection execution command to one of the injection devices, and the device receiving the command performs data packet packing and coding on the local address and then injects the local address into a line in a characteristic signal form;
s3: if other injection equipment in the line monitors the characteristic signal, the characteristic signal is demodulated, decoded and checked and then is stored in a slave address table;
s4: and after the fusion terminal executes the operations on all the injection devices one by one, acquiring the slave address tables of the injection devices one by one, and further determining the upstream and downstream relation of each injection device.
Further, in step S2, coding is performed by using a bit coding method, where there is injection in the cycle, the injection code is 1, the cycle is not injected, the injection code is 0, and two consecutive cycles are used to represent one bit; no injection is performed in the cycle one, and the injection in the cycle two indicates that bit is 0; injection exists in the cycle one, and no injection exists in the cycle two, which indicates that bit is 1; other injection cases are denoted as invalid data.
Further carrying out byte encoding on the basis of bit encoding, obtaining byte data to represent the local address of the injection equipment through byte encoding, wherein one complete byte data is represented by one bit of start bit, 8 bits of bit encoding data and one bit of end bit, the start bit is 0 and the end bit is 1
Further, the decoding method in step S3 is as follows:
s11: receiving coded addresses, decoding 20 continuous injection codes, and decoding according to the start bit format and the end bit format of bytes until header data is decoded;
s12: after header data is generated, when 20 injection codes are received again, 1 address data is decoded according to a byte format until 6 address data are decoded, and finally the last 1 check data are decoded by taking 20 injection codes;
s13: and summing the 6 address data, comparing the sum with the check data, if the sum result is consistent with the check data, the received address is valid, and storing the valid address into the slave address table.
Furthermore, the modulation coding and the demodulation decoding of the characteristic signal are carried out, the injection time of the characteristic signal is before the zero crossing of the positive half cycle of the voltage, the influence on the line is small, and only one injection is carried out in each cycle. The injection time per cycle was 200 us.
Further, in step S3, after the characteristic signal is monitored, the signal value of the characteristic signal is read, and during reading the signal, 100us is continuously detected to perform debounce filtering, and if the characteristic signal cannot last 100us, it is determined that there is no signal.
Furthermore, the fusion terminal and the injection device are both provided with HPLC communication, the injection device is independently provided with a characteristic signal injection and receiving function, and the fusion terminal sends a command of monitoring injection signals by using HPLC broadcast.
Further, in step S2, the convergence terminal sends an injection execution command to one of the injection devices, and sends a listening feature signal command to the other injection devices.
The invention has the beneficial effects that:
according to the invention, through encoding of the characteristic signals and decoding of other injection devices, the other injection devices identify the address information of the injection device executing injection, the address information is added to the slave address table after verification, and through finally summarizing the slave address tables of all the injection devices, the upstream and downstream relation among all the injection devices is determined, so that a rapid positioning effect is provided for the position of a line fault point.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a flow chart of characteristic signal reading according to the present invention;
fig. 3 is a flowchart of the topology network establishment of the convergence terminal of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, 2 and 3, a signal modulation and demodulation method for identifying topological relations of low-voltage transformer areas includes the following steps:
s1: the fusion terminal communicates with the injection equipment in the platform region, issues a monitoring execution command, and when the injection equipment receives the command, formats the slave address table and starts execution monitoring;
s2: after the injection devices are all started to execute monitoring, the fusion terminal sends an injection execution command to one of the injection devices, and the device receiving the command performs data packet packing and coding on the local address and then injects the local address into a line in a characteristic signal form;
s3: if other injection equipment in the line monitors the characteristic signal, the characteristic signal is demodulated, decoded and checked and then is stored in a subordinate address table;
s4: and after the fusion terminal executes the operations on all the injection devices one by one, acquiring the subordinate address lists of the injection devices one by one, further determining the upstream and downstream relation of each injection device, and establishing a topological network diagram through all the address lists sent by the fusion terminal.
The upstream device of the injection device performing the injection may listen to the characteristic signal, and therefore, addresses in the slave address table are all addresses of the downstream device of the device.
In another embodiment, in step S2, the encoding is performed by using a bit encoding method, the cycle has injection, the injection code is 1, the cycle has no injection, the injection code is 0, and two consecutive cycles are used to represent one bit; no injection is performed in the cycle one, and the injection in the cycle two indicates that bit is 0; injection exists in the cycle one, and no injection exists in the cycle two, which indicates that bit is 1; other injection cases are denoted as invalid data.
Two cycles represent a bit data, each cycle represents an injection code, the injection code '01' represents a bit data 0, the injection code '10' represents a bit data 1, and the injection code '00' or the injection code '11' is invalid bit data, so that bit data errors generated during coding and decoding can be avoided to the greatest extent.
In another embodiment, byte encoding is performed on the basis of bit encoding, byte data is obtained through byte encoding to represent the local address of the injection device, one complete byte data is represented by one bit of start bits, 8 bits of bit encoding data and one bit of end bits, the start bits are 0, namely, the injection encoding is '01', and the end bits are 1, namely, the injection encoding is '10'.
The method for encoding the data packet includes that the sum of header data, address data and check data is used as an address, wherein the sum of the header data and the check data is 1 byte, and the address data is 6 bytes, so that 160 cycles are required to be injected for completing the data packet encoding of one injection device, that is, 160 injection codes are required. And when decoding, checking the validity of the address data according to the corresponding format.
In another embodiment, after the characteristic signal is monitored in step S3, the signal value of the characteristic signal is read at each injection time, 200us is started for timeout during signal reading, no signal is determined when the characteristic signal is not detected within 200us, debounce filtering is performed by continuously detecting 100us during signal reading, and no signal is determined when the characteristic signal cannot last for 100 us.
| 1 byte | 6 bytes | 1 byte |
| Header data | Address data | Verifying data |
In another embodiment, the method of decoding in step S3 is as follows:
s11: receiving a characteristic signal with coded address information, and decoding 20 continuous injection codes until header data is decoded according to the start bit format and the end bit format of bytes; as in the table below, the header data is 0x 68;
s12: after header data is generated, when 20 injection codes are received again, 1 address data is decoded according to a byte format until 6 address data are decoded, and finally the last 1 check data are decoded by taking 20 injection codes;
s13: comparing the summation of the 6 address data with the check data by adopting a CS check mode, if the summation result is consistent with the check data, the received address is valid, and storing the address into a subordinate address table; and the corresponding injection equipment in the slave address table is the downstream equipment of the injection equipment. And a CRC (cyclic redundancy check) method can be adopted to check the data, so that the correctness and the integrity of the data are ensured.
The fusion terminal acquires the total number of injection devices and calls each injection device in sequence, and further acquires the slave device of each injection device, and further establishes a topological network diagram reflecting the upstream and downstream relation.
In another embodiment, the injection time of the characteristic signal is before the zero crossing of the positive half cycle of the voltage, the influence on the line is small, and the injection is performed only once in each cycle; the injection time per cycle was 200 us.
In another embodiment, the convergence terminal sends an execute injection command to one of the injection devices and sends a listen feature signal command to the other injection devices in step S2.
In another embodiment, the convergence terminal and the injection device are both provided with high-speed power line carrier (HPLC) communication, the injection device is independently provided with a characteristic signal injection and receiving function, and the convergence terminal sends out a monitoring execution injection command by adopting HPLC broadcasting.
In another embodiment, the injection device is mounted in a cable breakout box, a power cabinet, a meter box, or the like.
The working principle of the invention is as follows:
and the fusion terminal sends a command for reading the address of the lower-end signal injection equipment by using HPLC (high performance liquid chromatography) broadcasting, receives the address of the injection equipment, stores the address in a local address table, and repeats for many times until the address is not increased any more. After the device addresses of the injection equipment are collected, the control commands are issued one by one according to the addresses by the process fusion terminal, and the current signals are injected by the control commands. When the injection equipment injects signals into the branch installed on the injection equipment, the power supply point is used as a cut-off point, other injection equipment on the upstream of the branch power supply path at the installation position can detect the signals, the injection equipment on the upstream fills the signals into the slave address table when receiving the injection signals, and after all the injection equipment completes the injection, all the injection equipment locally stores a slave address table of the slave equipment on the downstream. And the fusion terminal reads the subordinate address tables of all the injection devices through HPLC (high performance liquid chromatography) and then processes the subordinate address tables, and counts the upstream and downstream subordinate relations of all the injection devices to form a topological relation graph.
According to the invention, through the encoding of the characteristic signals and the decoding of other injection devices, the other injection devices read and identify the address information of the injection device executing the injection, the address information is added to the slave address table after verification, and through finally summarizing the slave address tables of all the injection devices, the upstream and downstream relation among the injection devices is clarified, so that a rapid positioning effect is provided for the line fault point position.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A signal modulation and demodulation method for identifying topological relation of a low-voltage distribution area is characterized by comprising the following steps:
s1: the fusion terminal communicates with the injection equipment in the platform region, issues a monitoring execution command, and when the injection equipment receives the command, formats the slave address table and starts execution monitoring;
s2: after the injection devices are all started to execute monitoring, the fusion terminal sends an injection execution command to one of the injection devices, and the device receiving the command performs data packet packing and coding on the local address and then injects the local address into a line in a characteristic signal form; in the step S2, coding is performed by using a bit coding method, where the cycle is injected, the injection code is 1, the cycle is not injected, the injection code is 0, and two consecutive cycles are used to represent one bit; no injection is performed in the cycle one, and the injection in the cycle two indicates that bit is 0; injection exists in the cycle one, and no injection exists in the cycle two, which indicates that bit is 1; carrying out byte encoding on the basis of bit encoding, obtaining byte data through byte encoding to represent the local address of the injection equipment, wherein one complete byte data is represented by one bit of a start bit, 8 bits of bit encoding data and one bit of an end bit, the start bit is 0, and the end bit is 1;
s3: if other injection equipment in the line monitors the characteristic signal, the characteristic signal is demodulated, decoded and checked and then is stored in a subordinate address table; the decoding method in step S3 is as follows:
s11: receiving a characteristic signal with coded address information, decoding 20 continuous injection codes, and decoding according to a start bit format and an end bit format of bytes until header data is decoded;
s12: after header data is generated, when 20 injection codes are received again, 1 address data is decoded according to a byte format until 6 address data are decoded, and finally the last 1 check data are decoded by taking 20 injection codes;
s13: summing the 6 address data, comparing with the check data, if the summation result is consistent with the check data, the received address is valid, and storing the address in the subordinate address table;
s4: and after the fusion terminal executes the operations on all the injection devices one by one, acquiring the slave address tables of the injection devices one by one to summarize, and summarizing to obtain the upstream and downstream relation of each injection device.
2. A signal modulation and demodulation method for low-voltage transformer area topological relation identification as claimed in claim 1, characterized in that the injection time of single cycle is 200 us.
3. The signal modulation and demodulation method for identifying the topological relation of the low-voltage transformer area as claimed in claim 1, wherein the injection time of the characteristic signal is before the zero crossing of the positive half cycle of the voltage, and only one injection is performed in each cycle.
4. The signal modulation and demodulation method for low-voltage distribution area topological relation recognition according to claim 1, wherein after the characteristic signal is monitored in step S3, if the signal value of the characteristic signal is not read within 200us, it is determined as no signal.
5. The signal modulation and demodulation method for low-voltage transformer area topology relationship identification as claimed in claim 1, wherein said step S3 reads the signal value of the characteristic signal after monitoring the characteristic signal, continuously detects 100us for debounce filtering while reading the signal, and determines no signal if the characteristic signal can not last 100 us.
6. The signal modulation and demodulation method for low-voltage distribution area topological relation recognition, according to claim 1, characterized in that said convergence terminal and said injection device are both equipped with HPLC communication, said injection device is equipped with characteristic signal injection and receiving functions, and said convergence terminal issues listening execution command and execution injection command using HPLC broadcast.
7. The signal modulation and demodulation method for low-voltage platform zone topological relation recognition according to claim 1, wherein said step S2 is characterized in that said convergence terminal sends an execute injection command to one of said injection devices and sends a listen feature signal command to the other injection devices.
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| CN111463779A (en) * | 2020-04-23 | 2020-07-28 | 威胜信息技术股份有限公司 | Power distribution station topology identification system and method |
| CN112086965B (en) * | 2020-09-08 | 2022-02-15 | 国网江苏省电力有限公司电力科学研究院 | Low-voltage distribution network topology identification method and device |
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| CN112564274B (en) * | 2020-10-30 | 2022-06-17 | 福建网能科技开发有限责任公司 | Automatic topology identification method for electric intelligent distribution area |
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