Transformer area identification method and device based on short code multiple access micro-current communication

Abstract

The invention discloses a transformer area identification method and device based on short code multiple access micro-current communication, and relates to the technical field of power system automation, and the method comprises the steps: receiving a current signal which is transmitted by a transmitting device according to a preset frequency parameter and a transmitting moment and has a feature sequence; carrying out topology identification on the current signal, and recording a user serial number of the sending equipment and the characteristic signal intensity of the current signal; judging whether the topology identification round is equal to a preset total round or not; if the topology identification round is smaller than the preset total round, whether frequency adjustment needs to be carried out or not is judged; and if the topology identification round is equal to the preset total round, summarizing the transformer area identification information of topology identification, and carding to obtain a final transformer area identification result. According to the invention, overlapping switching of multiple pieces of user equipment is realized through a frequency division multiple access mode, a topology identification function is realized, the area identification time can be shortened by nearly a half on the premise that the identification accuracy is not influenced, and the area identification efficiency is effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of power system automation, and in particular to a method and device for identifying a substation area based on short code multiple address micro-current communication. Background Art

[0002] In the management of low-voltage distribution networks, substation identification is an important basic technology for power monitoring, line loss analysis and fault location. However, due to the lag in marketing and distribution, unclear responsibilities of multiple departments and other problems, substation files are generally chaotic, resulting in low accuracy in substation identification. In addition, some old communities have messy wiring, which further aggravates the confusion of substation-household relations, and some substations have heavy overload problems. Traditional substation identification methods are often difficult to achieve high accuracy in such a complex environment, and traditional substation identification methods take a long time, especially when there are many users, the identification process is very slow.

[0003] With the rapid development of automation technology, in order to solve the accuracy and efficiency problems of substation identification in low-voltage distribution networks, the industry has gradually adopted big data analysis, power line carrier communication technology, voltage feature analysis, and characteristic current injection methods. From the perspective of overall recognition accuracy and recognition time, the characteristic current injection method can ensure the effect of high recognition accuracy in a shorter time, and it is applicable to more scenarios.

[0004] At present, the commonly used micro-current communication method is to use a single frequency and a single characteristic sequence. However, when there are many users in the area, the method of sending characteristic signals sequentially will significantly increase the recognition time. Taking an area with 200 users as an example, it takes at least 35 minutes to perform an area recognition, and if multiple rounds of recognition are performed, the time required will increase exponentially. Summary of the invention

[0005] To this end, the present application provides a method and device for identifying a substation based on short code multiple address micro-current communication to solve the problem that the substation identification method in the prior art takes a long time.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] In a first aspect, a method for identifying a station area based on short code multiple address micro-current communication comprises:

[0008] Step 1: receiving a current signal with a characteristic sequence sent by a transmitting device according to a preset frequency parameter and a sending time;

[0009] Step 2: Perform topology identification on the current signal, and record the user serial number of the sending device and the characteristic signal strength of the current signal;

[0010] Step 3: Determine whether the topology identification round is equal to the preset total round;

[0011] Step 4: If the topology identification round is less than the preset total round, determine whether frequency adjustment is required;

[0012] Step 5: If the topology identification round is equal to the preset total round, the substation identification information of the topology identification is summarized and sorted to obtain the final substation identification result.

[0013] Preferably, in step 1, the frequency parameters include a synchronization signal frequency and an information bit frequency, the synchronization signal frequency has 1 frequency point, the information bit frequency has 2 frequency points, and the 1 frequency point of the synchronization signal frequency and the 2 frequency points of the information bit frequency are orthogonal to each other within the feature code bit time.

[0014] Preferably, in step 1, when the sending device sends a current signal with a characteristic sequence according to pre-set frequency parameters and the sending time, the sending strategy is: for the sending device with an odd user number, the synchronization signal for sending the characteristic current is S1, and the frequency of the user sequence number information sent is the first frequency point of the information bit frequency; for the sending device with an even user number, the synchronization signal for sending the characteristic current is S2, and the frequency of the user sequence number information sent is the second frequency point of the information bit frequency.

[0015] Preferably, the synchronization signal of the current signal sent by each device is 8 bits, and the duration of each synchronization signal bit is 0.6s; the information bit of the current signal sent by each device is 16 bits, and the duration of each information bit is 0.3s.

[0016] Preferably, the information bits of the current signal are encoded in PE mode.

[0017] Preferably, in step 4, when determining whether frequency adjustment is required, the frequency of the information bit is determined.

[0018] Preferably, in step 4, when determining whether frequency adjustment is required, specifically including: when the success rate of characteristic signal recognition of the first frequency point or the second frequency point of the information bit frequency is low, changing the information bit frequency to the third frequency point in the next round of topology identification.

[0019] In a second aspect, a station area identification device based on short code multiple address micro-current communication comprises:

[0020] A signal receiving module, used to receive a current signal with a characteristic sequence sent by a sending device according to a preset frequency parameter and sending time;

[0021] A topology identification module, used to perform topology identification on the current signal and record the user serial number of the sending device and the characteristic signal strength of the current signal;

[0022] The judgment module is used to judge whether the topology identification round is equal to the preset total round; if the topology identification round is less than the preset total round, it is judged whether frequency adjustment is required; if the topology identification round is equal to the preset total round, the substation identification information of the topology identification is summarized and sorted to obtain the final substation identification result.

[0023] In a third aspect, a computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the processor implements the steps of a station area identification method based on short code multiple access micro-current communication.

[0024] In a fourth aspect, a computer program product includes a computer program or instructions, which, when executed by a processor, implement the steps of a method for identifying a station area based on short code multiple access micro-current communication.

[0025] Compared with the prior art, this application has at least the following beneficial effects:

[0026] The present application provides a method and device for identifying a substation based on short code multiple access micro-current communication, which receives a current signal with a characteristic sequence sent by a transmitting device according to a preset frequency parameter and a sending time; performs topological identification on the current signal, and records the user serial number of the transmitting device and the characteristic signal strength of the current signal; determines whether the topological identification round is equal to the preset total round; if the topological identification round is less than the preset total round, determines whether frequency adjustment is required; if the topological identification round is equal to the preset total round, summarizes the substation identification information of the topological identification, and sorts it out to obtain the final substation identification result. The present application realizes the overlapping switching and topological identification functions of multiple user devices through frequency division multiple access, which can shorten the time of substation identification by nearly half without affecting the identification accuracy, and effectively improves the efficiency of substation identification. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more intuitively illustrate the prior art and the present application, exemplary drawings are given below. It should be understood that the specific shapes and structures shown in the drawings should not generally be regarded as limiting conditions for implementing the present application; for example, those skilled in the art are capable of easily making conventional adjustments or further optimizations to the addition / reduction / attribution division, specific shapes, positional relationships, connection methods, dimensional ratios, etc. of certain units (components) based on the technical concepts and exemplary drawings disclosed in the present application.

[0028] Figure 1A flow chart of a method for identifying a station area based on short code multiple access micro-current communication provided in Example 1 of the present application;

[0029] Figure 2 An overall flow chart of a method for identifying a station area based on short code multiple address micro-current communication provided in Example 1 of the present application;

[0030] Figure 3 A schematic diagram of a characteristic current signal provided in Example 1 of the present application;

[0031] Figure 4 A timing diagram of multiple users sending characteristic currents provided in the first embodiment of the present application;

[0032] Figure 5 This is a waveform diagram of characteristic signal detection under multi-user transmission conditions provided in Example 1 of the present application. DETAILED DESCRIPTION

[0033] The present application is further described below in detail through specific embodiments in conjunction with the accompanying drawings.

[0034] In the description of this application: unless otherwise specified, the meaning of "plurality" is two or more. The terms "first", "second", "third", etc. in this application are intended to distinguish the objects referred to, and do not have special meanings in terms of technical connotations (for example, they should not be understood as emphasizing the importance or order, etc.). Expressions such as "including", "comprising", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

[0035] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this application are usually used to indicate the general relative position relationship for the purpose of intuitive understanding by referring to the drawings, and are not absolute limitations on the position relationship in the actual product.

[0036] Embodiment 1

[0037] See also Figure 1 and Figure 2 This embodiment provides a method for identifying a station area based on short code multiple access micro-current communication, including:

[0038] Step 1: receiving a current signal with a characteristic sequence sent by a transmitting device according to a preset frequency parameter and a sending time;

[0039] Specifically, this embodiment pre-programs different serial numbers for each user's sending device, with the serial number range being 0 to 255, and pre-sets the total rounds N of topology identification and characteristic current sending parameters, which include frequency parameters Fi and sending time T.

[0040] Among them, the frequency parameter Fi includes two types of frequencies, namely the synchronization signal frequency Fhead and the information bit frequency Finf. Fhead has one frequency point, and Finf has two frequency points, namely Finf1 and Finf2, and the three frequency points are mutually orthogonal within the feature code bit time. For example, Fhead can be set to 683.33Hz, Finf1 to 783.33Hz, and Finf2 to 833.33Hz.

[0041] After setting the parameters, set the current transmission round i to 1 and start the station area identification command. The sending device sends a current signal with a characteristic sequence to the terminal according to the frequency parameters and the sending time.

[0042] More specifically, when the transmitting device transmits a current signal with a characteristic sequence according to the pre-set frequency parameters and transmission time, its transmission strategy is: for a transmitting device with an odd user number, the synchronization signal for transmitting the characteristic current is S1, and the frequency of the transmitted user number information is the first frequency point Finf1 of the information bit frequency; for a transmitting device with an even user number, the synchronization signal for transmitting the characteristic current is S2, and the frequency of the transmitted user number information is the second frequency point Finf2 of the information bit frequency. For example, signal S1 can be set to 10001110, and signal S2 can be set to 10111001.

[0043] It should be noted that, in this embodiment, the characteristic currents sent by the user with sequence number N (N is an even number) and the user with sequence number N+1 can overlap for a certain period of time, and the characteristic currents sent by the user with sequence number N+1 and the user with sequence number N+2 can also overlap for a certain period of time. It is only necessary to ensure that the synchronization signals do not overlap with each other.

[0044] In this embodiment, the synchronization signal of the current signal sent by each device is 8 bits, and the duration of each bit of the synchronization signal is 0.6s; the current information bit sent by each device adopts PE encoding, the encoded information bit is 16 bits, and the duration of each information bit is 0.3s.

[0045] Step 2: Perform topology recognition on the current signal and record the user serial number of the sending device and the characteristic signal strength of the current signal;

[0046] Specifically, the terminal performs topology recognition on the current signal all the time, and after recognizing the current signal, records the user serial number j of the sending device and the characteristic signal strength Pj of the current signal.

[0047] Step 3: Determine whether the topology identification round is equal to the preset total round;

[0048] Specifically, this step needs to determine whether the topology identification round i is equal to the total round N.

[0049] Step 4: If the topology recognition round is less than the preset total number of rounds, determine whether frequency adjustment is required;

[0050] Specifically, if i < N, then i = i + 1, and determine whether frequency adjustment is required. When determining whether frequency adjustment is required, the information bit frequency is judged. When the recognition success rate of the characteristic signal of the first frequency point Finf1 or the second frequency point Finf2 of the information bit frequency is relatively low, the information bit frequency can be changed to the third frequency point Finf3 in the next round of recognition.

[0051] For example: The logic for determining whether the frequency needs to be adjusted is set as follows: When the information recognition accuracy of the first frequency point Finf1 of the information bit frequency < 0.7 * the frequency recognition accuracy of the Finf2 frequency point, or when the information recognition accuracy of the second frequency point Finf2 of the information bit frequency < 0.7 * the frequency recognition accuracy of Finf1, then the frequency adjustment strategy is enabled; the third frequency Finf3 of the changed information bit frequency can be set to 883.33 Hz or 733.33 Hz.

[0052] Step 5: If the topology recognition round is equal to the preset total number of rounds, summarize the substation area recognition information of the topology recognition, and sort it out to obtain the final substation area recognition result.

[0053] Specifically, the terminal sorts out the recognition results of N times and gives the final substation area recognition result.

[0054] Figure 3 This is the schematic diagram of the characteristic current signal provided in this embodiment, taking the characteristic current amplitude of 0.4 A as an example. Figure 3 It represents the characteristic current sent by user 105. It can be seen that the synchronization signal is S1, that is, [10001110]. When the symbol of the signal is 1, the characteristic current is sent for a duration of 0.6 s. When the symbol of the signal is 0, the characteristic current is not sent for a duration of 0.6 s. The synchronization signal is represented as 105, which is converted to binary as [01101001]. After PE coding, the synchronization signal is [0110100110010110]. The sending duration of the characteristic current for each bit is 0.3 s. Therefore, the sending duration of the characteristic current of the information bit is 4.8 s. Therefore, the total sending duration of the characteristic current is 9.6 s.

[0055] Figure 4A timing diagram of multiple users sending characteristic currents provided in this embodiment. Taking user 105, user 106 and user 107 as examples, it can be seen that for different users to send characteristic current signals, as long as the synchronization sequences between them are guaranteed to be non-overlapping, the terminal identification process is to collect current signals, detect the synchronization sequence with a frequency of Fhead, and when the synchronization sequence is detected to be S1, identify the signal sequence with a frequency of Finf1 (the sequence is the information bit after 4.8s), and continue to detect the synchronization sequence at the same time. When the synchronization sequence is detected to be S2, identify the signal sequence with a frequency of Finf2 (the sequence is the information bit after 4.8s), and continue to detect the synchronization sequence at the same time, repeat the whole process until the last user is identified or the synchronization sequence cannot be identified. Since Fhead, Finf1 and Finf2 are mutually orthogonal within a detection period of 0.3s, a multiple access communication scheme with overlapping time domains can be implemented.

[0056] Figure 5 The following is a waveform diagram of characteristic signal detection under multi-user transmission conditions provided in this embodiment. Figure 4 Taking the sending sequence as an example, the receiving device uses sliding Fourier transform for signal detection. The figure above is the recognition result of the synchronization signal. The detection frequency is 683.33Hz, the Fourier transform time is 0.6s, and the sliding step is 0.06s. The synchronization signal sequence is obtained by identifying the high / low changes of the detection result; the middle figure is the detection result of the odd user number, the detection frequency is 783.33Hz, the Fourier transform time is 0.3s, and the sliding step is 0.06s. The sequence information is obtained by making a difference between adjacent bits; the figure below is the detection result of the even user number, the detection frequency is 833.33Hz, and the detection method is the same as the detection method of the odd user number. It can be seen that as long as the synchronization signal does not overlap, the synchronization signal and the corresponding user information can be accurately identified to realize the transmission of frequency division multiple access.

[0057] The present embodiment provides a method for identifying a substation based on short code multiple access micro-current communication, which enables overlapping switching of multiple users through frequency division multiple access (i.e., using different frequency parameters and frequency adjustment mechanisms), assigns different serial numbers to devices, and detects serial numbers of receiving devices to realize topology identification function. It can shorten the time for substation identification by nearly half without affecting the identification accuracy.

[0058] This embodiment applies frequency division multiple access technology to the field of station area identification, and also effectively improves the efficiency of station area identification. It improves the signal recognition rate by sending short synchronization codes, reduces the misrecognition rate by using a synchronization + information bit comprehensive judgment method, and effectively improves the signal-to-noise ratio of signal transmission by using an adaptive frequency adjustment scheme, thereby greatly improving the effect of station area identification.

[0059] Embodiment 2

[0060] This embodiment provides a station area identification device based on short code multiple address micro-current communication, including:

[0061] A signal receiving module, used to receive a current signal with a characteristic sequence sent by a sending device according to a preset frequency parameter and sending time;

[0062] A topology identification module, used to perform topology identification on the current signal and record the user serial number of the sending device and the characteristic signal strength of the current signal;

[0063] The judgment module is used to judge whether the topology identification round is equal to the preset total round; if the topology identification round is less than the preset total round, it is judged whether frequency adjustment is required; if the topology identification round is equal to the preset total round, the substation identification information of the topology identification is summarized and sorted to obtain the final substation identification result.

[0064] For the specific implementation content of each module in a station area identification device based on short code multiple address microcurrent communication, please refer to the above definition of a station area identification method based on short code multiple address microcurrent communication, which will not be repeated here.

[0065] Embodiment 3

[0066] This embodiment provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of a method for identifying a station area based on short code multiple access micro-current communication are implemented.

[0067] Embodiment 4

[0068] This embodiment provides a computer program product, including a computer program or instructions, which, when executed by a processor, implements the steps of a method for identifying a station area based on short code multiple access micro-current communication.

[0069] The technical features of the above embodiments may be arbitrarily combined (as long as there is no contradiction in the combination of these technical features). To make the description concise, not all possible combinations of the technical features in the above embodiments are described; these embodiments that are not explicitly written should also be considered to be within the scope of this specification.

Claims

1. A method for identifying a station area based on short code multiple address micro-current communication, characterized in that: include: Step 1: receiving a current signal with a characteristic sequence sent by a transmitting device according to a preset frequency parameter and a sending time; Step 2: Perform topology identification on the current signal, and record the user serial number of the sending device and the characteristic signal strength of the current signal; Step 3: Determine whether the topology identification round is equal to the preset total round; Step 4: If the topology identification round is less than the preset total round, determine whether frequency adjustment is required; Step 5: If the topology identification round is equal to the preset total round, the substation identification information of the topology identification is summarized and sorted to obtain the final substation identification result.

2. The method for identifying a station area based on short code multiple access micro-current communication according to claim 1, characterized in that: In step 1, the frequency parameters include a synchronization signal frequency and an information bit frequency, the synchronization signal frequency has one frequency point, the information bit frequency has two frequency points, and the one frequency point of the synchronization signal frequency and the two frequency points of the information bit frequency are orthogonal to each other within the feature code bit time.

3. The method for identifying a station area based on short code multiple access micro-current communication according to claim 2, characterized in that: In step 1, when the sending device sends a current signal with a characteristic sequence according to the pre-set frequency parameters and the sending time, the sending strategy is: for the sending device with an odd user number, the synchronization signal for sending the characteristic current is S1, and the frequency of the user sequence information sent is the first frequency point of the information bit frequency; for the sending device with an even user number, the synchronization signal for sending the characteristic current is S2, and the frequency of the user sequence information sent is the second frequency point of the information bit frequency.

4. The method for identifying a station area based on short code multiple access micro-current communication according to claim 2, characterized in that: The synchronization signal of the current signal sent by each device is 8 bits, and the duration of each synchronization signal is 0.6s; the information bit of the current signal sent by each device is 16 bits, and the duration of each information bit is 0.3s.

5. The method for identifying a station area based on short code multiple address micro-current communication according to claim 4, characterized in that: The information bits of the current signal are encoded in PE format.

6. The method for identifying a station area based on short code multiple address micro-current communication according to claim 2, characterized in that: In step 4, when determining whether frequency adjustment is required, the frequency of the information bit is determined.

7. The method for identifying a station area based on short code multiple access micro-current communication according to claim 6, characterized in that: In step 4, determining whether frequency adjustment is required specifically includes: when the characteristic signal recognition success rate of the first frequency point or the second frequency point of the information bit frequency is low, changing the information bit frequency to the third frequency point in the next round of topology recognition.

8. A station area identification device based on short code multiple address micro-current communication, characterized in that: include: A signal receiving module, used to receive a current signal with a characteristic sequence sent by a sending device according to a preset frequency parameter and sending time; A topology identification module, used to perform topology identification on the current signal and record the user serial number of the sending device and the characteristic signal strength of the current signal; A judgment module is used to judge whether the topology identification round is equal to the preset total round; if the topology identification round is less than the preset total round, then judge whether frequency adjustment is required; If the topology identification round is equal to the preset total round, the substation identification information of the topology identification is summarized and sorted out to obtain the final substation identification result.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer program product comprising a computer program or instructions, characterized in that When the computer program or instruction is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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