CN113358139A - Method for encoding by using adjacent distorted pulse current signals in power frequency communication - Google Patents
Method for encoding by using adjacent distorted pulse current signals in power frequency communication Download PDFInfo
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- CN113358139A CN113358139A CN202110481399.XA CN202110481399A CN113358139A CN 113358139 A CN113358139 A CN 113358139A CN 202110481399 A CN202110481399 A CN 202110481399A CN 113358139 A CN113358139 A CN 113358139A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
- G01D5/249—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains using pulse code
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
Abstract
The invention discloses a method for coding by using adjacent distorted pulse current signals in power frequency communication, which comprises the following steps: formulating a character coding table; sending an initial symbol, wherein the initial symbol consists of N distorted pulse current signals, H idle current cycles are arranged between two adjacent distorted pulse current signals, N is an integer larger than 1, and H is an integer larger than 0; sending a data field, wherein the data field consists of K distorted pulse current signals for transmitting K data, K is the total number of the data to be transmitted, and at least M + P idle current cycles are contained between each distorted pulse current signal and the previous distorted pulse current signal in the data field; and sending a check code and checking all data field data. The coding method greatly reduces the number of distorted pulse current signals required by transmission, enhances the anti-interference capability of power frequency communication, reduces the error rate of power frequency communication, and has obvious advantages of short data communication.
Description
Technical Field
The invention relates to the technical field of instruments and meters, in particular to a method for coding by using adjacent distorted pulse current signals in power frequency communication.
Background
At present, an important work of an electricity utilization information acquisition system and a low-voltage distribution network system is to realize automatic identification of a low-voltage distribution network household variable relation and a transformer area physical topological relation, and through an accurate transformer area household variable relation, the problems of low transformer area meter reading success rate, inaccurate transformer area line loss calculation and the like caused by inaccurate transformer area attribution relation can be found in time. The station area diversity relation and topology identification are generally realized by adopting a power frequency communication technology, the main principle of the power frequency communication technology is that a power frequency voltage fundamental wave zero-crossing modulation method is utilized, weak distortion of a modulation voltage or current waveform near a zero-crossing point is utilized to carry information, and information transmission is realized by utilizing the relative change and invariance of voltage or current of adjacent periods.
The whole power frequency communication system comprises a power frequency voltage modulation device and a corresponding distortion pulse current receiving and identifying device, wherein the power frequency voltage modulation and sending device is generally installed at the side of a low-voltage distribution station meter box, a branch box and other end users, and the distortion pulse current receiving and identifying device is generally installed at the low-voltage distribution station branch box and the low-voltage side of a distribution transformer. The main working process is that the power frequency voltage modulation transmitting device controls the switch tube to be conducted through a certain phase angle before the power frequency voltage zero crossing point, an instantaneous distortion pulse current signal is generated on a low-voltage distribution line at the corresponding zero crossing point moment, the distortion pulse current signal can be superposed on the load current at the voltage zero crossing point moment and can be transmitted to the transformer side of a distribution area along a power line received by the modulation device, the distortion pulse current receiving device is arranged at the position of the transformer, the distortion pulse current signal is collected and demodulated by the distortion pulse current receiving device, and therefore the identification of the distortion pulse current signal is completed. According to a certain modulation coding method, the power frequency voltage zero crossing point is continuously modulated for multiple times, multiple distorted pulse current signals can be generated, and the identification end identifies and demodulates the signals, so that one-time communication can be completed. The modulation is carried out before the zero crossing point of the power frequency voltage waveform, the energy required by the modulation is minimum, and the impact on the power grid and the voltage and current distortion caused in the modulation process can be controlled within a reasonable range. The signal transmitted from the power frequency voltage modulation transmitting device to the distorted pulse current receiving and identifying device is called an uplink modulation signal, and the uplink modulation signal carries modulation information by utilizing a current fundamental wave shape.
In the process of modulating the power frequency voltage, information needs to be encoded. The existing modulation coding methods use two or more distorted pulse current signals to represent one bit of data, which can be represented as "1" and "0". The modulation coding method causes the distorted pulse current signals to be frequently sent, the communication is easily interfered, the error rate is high, and the safety, the reliability and the service life are influenced by the frequent switching of a switching tube of a hardware modulation circuit in a short time.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a power frequency communication signal coding method which is less in sending quantity of distorted pulse current signals, high in communication reliability, strong in anti-interference capability and low in error rate.
In order to solve the above technical problem, the present invention provides a method for encoding by using adjacent distorted pulse current signals in power frequency communication, comprising the following steps:
formulating a character coding table according to all data to be transmitted;
sending an initial symbol, wherein the initial symbol consists of N distorted pulse current signals, H idle current cycles are arranged between two adjacent distorted pulse current signals, N is an integer larger than 1, and H is an integer larger than 0;
sending a data field, wherein the data field is composed of K distorted pulse current signals for transmitting K data, K is the total number of data to be transmitted, M + P idle current cycles are contained between each distorted pulse current signal and the previous distorted pulse current signal in the data field, M is an integer from 0 to Mmax, Mmax is the total number of characters in the character coding table, and P is an integer greater than 0;
and sending a check code and checking all data field data.
Further, after the step of sending the check code, the method further comprises the steps of:
sending an end symbol, wherein the end symbol is composed of R distorted pulse current signals, T idle current cycles exist between two adjacent distorted pulse current signals, R is an integer larger than 1, T is an integer larger than 0, and the end symbol is different from the start symbol.
Further, in the step of sending the start symbol, the number H of idle current cycles of the two adjacent distorted pulse current signals is an integer of 1 or more and 100 or less.
Further, in the step of transmitting the start symbol, the number N of the distorted pulse current signals is an integer of 3 or more and 10 or less.
Further, in the step of transmitting the data field, the number P of idle current cycles is an integer of 2 or more and 100 or less.
Further, in the step of sending the check code, the check code is checked by using a total sum or a CRC cycle.
Further, the character encoding table includes 10 decimal number characters from "0" to "9".
Furthermore, the data coding of 10 digital characters from 0 to 9 adopts a BCD coding mode, the minimum number is 0, the maximum number is 9, and the high order is before and the low order is after the transmission.
Further, the check code is composed of two decimal numeric characters.
Furthermore, the number of idle current cycles included in any one of the distorted pulse current signal and the previous distorted pulse current signal in the data field and the check code is P + X, and the correspondence between P + X and any one decimal number character from "0" to "9" is as follows:
p +0 corresponds to the decimal number character "0", P +1 corresponds to the decimal number character "1", P +2 corresponds to the decimal number character "2", P +3 corresponds to the decimal number character "3", P +4 corresponds to the decimal number character "4", P +5 corresponds to the decimal number character "5", P +6 corresponds to the decimal number character "6", P +7 corresponds to the decimal number character "7", P +8 corresponds to the decimal number character "8", and P +9 corresponds to the decimal number character "9".
Compared with the coding scheme in the prior power frequency communication, the coding method disclosed by the invention has the beneficial effects that two or more distorted pulse current signals are used for representing one bit of data, such as representing 1 or 0, the coding method disclosed by the invention utilizes the difference of the relative positions of the two distorted pulse current signals to represent different information, only the relative positions of the two distorted pulse current signals are used for representing character data in a character coding table, and K distorted pulse current signals are used for transmitting K character data. For example, a decimal number (ranging from 0 to 9) character string "0123456789" is transmitted, and only 10 distorted pulse current signals are needed for coding and transmission. Compared with the existing coding scheme in power frequency communication, the method greatly reduces the number of distorted pulse current signals required by transmission, enhances the anti-interference capability of power frequency communication, reduces the error rate of power frequency communication, and has obvious advantages of short data communication. And the method for coding modulation greatly reduces the short-time switching frequency of a switching tube of the hardware modulation circuit, and increases the safety, reliability and service life of the hardware modulation circuit.
Drawings
FIG. 1 is a flow chart of an embodiment 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 some, not all, embodiments of the present invention. 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.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As shown in fig. 1, a method for encoding by using adjacent distorted pulse current signals in power frequency communication includes the following steps:
step S101: formulating a character coding table according to all data to be transmitted;
step S102: sending an initial symbol, wherein the initial symbol consists of N distorted pulse current signals, H idle current cycles are arranged between two adjacent distorted pulse current signals, N is an integer larger than 1, and H is an integer larger than 0;
step S103: sending a data field, wherein the data field is composed of K distorted pulse current signals for transmitting K data, K is the total number of data to be transmitted, M + P idle current cycles are contained between each distorted pulse current signal and the previous distorted pulse current signal in the data field, M is an integer from 0 to Mmax, Mmax is the total number of characters in the character coding table, and P is an integer greater than 0;
step S104: and sending a check code and checking all data field data.
As a more preferable scheme, after the step of sending the check code, the method further comprises the following steps:
sending an end symbol, wherein the end symbol is composed of R distorted pulse current signals, T idle current cycles exist between two adjacent distorted pulse current signals, R is an integer larger than 1, T is an integer larger than 0, and the end symbol is different from the start symbol.
More preferably, in step S102, the number H of idle current cycles of the two adjacent distortion pulse current signals is an integer of 1 or more and 100 or less, and the number N of distortion pulse current signals is an integer of 3 or more and 10 or less.
More preferably, in step S103, the number P of idle current cycles is an integer of 2 or more and 100 or less.
More preferably, in step S104, the check code uses a total sum or CRC cycle check. The check code consists of two decimal numeric characters.
More preferably, in step S101, the character code table includes 10 decimal number characters "0" to "9". The data coding of 10 digital characters from 0 to 9 adopts a BCD coding mode, the minimum number is 0, the maximum number is 9, and the high order is before and after the transmission.
As a more preferable scheme, the number of idle current cycles included in any one of the distorted pulse current signal and the previous distorted pulse current signal in the data field and the check code is P + X, and the correspondence between P + X and any one decimal number character from "0" to "9" is as follows:
p +0 corresponds to the decimal number character "0", P +1 corresponds to the decimal number character "1", P +2 corresponds to the decimal number character "2", P +3 corresponds to the decimal number character "3", P +4 corresponds to the decimal number character "4", P +5 corresponds to the decimal number character "5", P +6 corresponds to the decimal number character "6", P +7 corresponds to the decimal number character "7", P +8 corresponds to the decimal number character "8", P +9 corresponds to the decimal number character "9"
Taking the sending of the decimal data string "1234" as an example, according to the preferred scheme of the embodiment:
if N is 3, H is 10, P is 10, and K is 4, the entire complete encoded data consists of 9 distorted pulse current signals.
The coded data start symbol consists of 3 distorted pulse current signals, and 10 idle current cycles exist between two adjacent distorted pulse current signals. Taking 50Hz power frequency voltage as an example, one voltage or current cycle period is 20ms, Y voltage or current cycle times are 20 × Y (ms), and the start time is 2 × 10 × 20ms — 400 ms.
The data of the data field is 4 digital characters in total of '1234', so the data is composed of 4 distorted pulse current signals during code modulation, and 10 idle current cycles are contained between the 4 th distorted pulse current signal representing digital '1' and the 3 rd distorted pulse current signal representing the start character; 11 idle current cycles are contained between the 5 th distorted pulse current signal and the 4 th distorted pulse current signal which represent the number '2'; 12 idle current cycles are contained between the 6 th distorted pulse current signal and the 5 th distorted pulse current signal which represent the number '3'; 13 idle current cycles are included between the 7 th distorted pulse current signal and the 6 th distorted pulse current signal representing the number "4".
The check code is chosen to be the modulo 256 sum, i.e., the sum, of all the individual bytes of data in the data field, then 1234 the sum is 46. 13 idle current cycles are included between the 8 th distorted pulse current signal representing the check code number "4" and the 7 th distorted pulse current signal of the data field data; 15 idle current cycles are contained between the 9 th distorted pulse current signal and the 8 th distorted pulse current signal representing the check code number "6".
The embodiment of the invention can carry out sequence adjustment, combination and deletion according to actual needs.
The embodiments describe the present invention in detail, and the specific embodiments are applied to illustrate the principle and the implementation of the present invention, and the above embodiments are only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A method for coding by using adjacent distorted pulse current signals in power frequency communication is characterized by comprising the following steps:
formulating a character coding table according to all data to be transmitted;
sending an initial symbol, wherein the initial symbol consists of N distorted pulse current signals, H idle current cycles are arranged between two adjacent distorted pulse current signals, N is an integer larger than 1, and H is an integer larger than 0;
sending a data field, wherein the data field is composed of K distorted pulse current signals for transmitting K data, K is the total number of data to be transmitted, M + P idle current cycles are contained between each distorted pulse current signal and the previous distorted pulse current signal in the data field, M is an integer from 0 to Mmax, Mmax is the total number of characters in the character coding table, and P is an integer greater than 0;
and sending a check code and checking all data field data.
2. The method for encoding by using adjacent distorted pulse current signals in power frequency communication according to claim 1, further comprising the following steps after the step of sending check code:
sending an end symbol, wherein the end symbol is composed of R distorted pulse current signals, T idle current cycles exist between two adjacent distorted pulse current signals, R is an integer larger than 1, T is an integer larger than 0, and the end symbol is different from the start symbol.
3. The method according to claim 1, wherein in the step of transmitting the start symbol, the number H of idle current cycles of the two adjacent distorted pulse current signals is an integer of 1 or more and 100 or less.
4. The method according to claim 1, wherein in the step of transmitting the start symbol, the number N of the distorted pulse current signals is an integer of 3 or more and 10 or less.
5. The method according to claim 1, wherein in the step of transmitting the data field, the number P of idle current cycles is an integer of 2 or more and 100 or less.
6. The method for encoding by using adjacent distorted pulse current signals in power frequency communication according to claim 1, wherein in the step of sending the check code, the check code adopts total addition or CRC (cyclic redundancy check) cycle check.
7. The method for encoding by using adjacent distorted pulse current signals in power frequency communication according to claim 1, wherein the character encoding table comprises 10 decimal numeric characters from "0" to "9".
8. The method for encoding by using adjacent distorted pulse current signals in power frequency communication according to claim 7, wherein the data encoding of 10 total digital characters from "0" to "9" adopts BCD encoding mode, the minimum number is "0", the maximum number is "9", and the high order is before and low order when transmitting.
9. The method of claim 1, wherein the check code comprises two decimal digits.
10. The method according to claim 7, wherein the number of idle current cycles included in any distorted pulse current signal in the data field and the check code and the previous distorted pulse current signal is P + X, and the correspondence between P + X and any decimal number character from "0" to "9" is as follows:
p +0 corresponds to the decimal number character "0", P +1 corresponds to the decimal number character "1", P +2 corresponds to the decimal number character "2", P +3 corresponds to the decimal number character "3", P +4 corresponds to the decimal number character "4", P +5 corresponds to the decimal number character "5", P +6 corresponds to the decimal number character "6", P +7 corresponds to the decimal number character "7", P +8 corresponds to the decimal number character "8", and P +9 corresponds to the decimal number character "9".
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