A topology collaborative calculation method for low-voltage area edge devices and master stations

Abstract

The present invention relates to a method for collaborative topology calculation between low-voltage substation edge devices and a main station, comprising initial file acquisition; collecting terminal device data; edge topology calculation; file collaboration, elimination, and abnormal device information processing; and verification of file information adjustments by the main station, and updating and improving the information. The present invention allows edge devices to continuously collaborate with the main station to improve the files, making topology calculations more accurate. The topology algorithm is primarily concentrated on edge devices, unlike traditional topology calculations that are deployed at the main station. The present invention does not need to wait for all relevant adjacent substation topology data to be fully uploaded before performing topology calculations, resulting in a short calculation cycle. Furthermore, the calculation results can be verified in real time, reducing the cost of manual troubleshooting.

Description

Technical Field

[0001] The present invention relates to a topology collaborative calculation method for low-voltage substation edge equipment and a main station, belonging to the technical field of distribution networks. Background Art

[0002] Low-voltage substations are an important part of the national power grid. In the process of electricity management, it is first necessary to obtain the topological structure information of the distribution network. However, due to the large number of users, multiple branches, and incomplete filing information in low-voltage substations, clarifying the substation topology structure has always been a difficulty in electricity service.

[0003] Current mainstream topology technologies have the following drawbacks:

[0004] When power companies obtain topology information from substation construction, the integrity and reliability of this original archival information cannot be guaranteed under normal circumstances due to various load adjustment switching or input errors. At the same time, there is no effective archival verification method, and manual investigation is the only way. The current low-voltage substation topology algorithm runs on the master station and must wait for all relevant adjacent substation topology data to be fully uploaded before topology calculation can be performed. The calculation cycle is long and the real-time performance is poor, which cannot meet the needs of the development of related subsequent business.

[0005] Therefore, a topology collaborative calculation method for low-voltage area edge devices and the main station is needed. Summary of the Invention

[0006] In order to solve the above technical problems, the present invention provides a topology collaborative calculation method for low-voltage area edge devices and the master station, and its specific technical solution is as follows:

[0007] A method for collaborative topology calculation between low-voltage area edge devices and a master station includes the following steps:

[0008] Step 1: Initial file acquisition: The edge device receives the terminal device file of the corresponding area from the master station and sets the terminal device whitelist based on the terminal device file;

[0009] Step 2: Collect terminal device data: The edge device periodically collects the electrical operation data of the terminal device contained in the initial file based on the initial file;

[0010] Step 3: Edge topology calculation: The edge device performs real-time calculations based on the collected appliance operation data, including similarity calculations.

[0011] The similarity calculation includes original similarity calculation, single-day best similarity calculation and best match calculation within a time period.

[0012] The calculation formula of the original similarity is:

[0013] (1),

[0014] MBF and MBS are meter box numbers. is the similarity of the voltage curves of MBF meter box and MBS meter box on day d, where d is the date number, is the voltage point set of MBF box-type transformer on day d, is the voltage point set of the MBS meter box on day d, i is the terminal equipment number;

[0015] The best similarity match calculation for a single day is to take the maximum similarity between the MBS meter box and all branches within the range on that day. The calculation formula is:

[0016] (2),

[0017] in is the single-day similarity, d is the date number, X is the terminal device similarity sequence,

[0018] The best match calculation within the time period is to sum the best matching branches of the MBS of the meter boxes in n days and take the maximum value. The calculation formula is:

[0019] (3),

[0020] in is the similarity within the time period, d is the date number, and X is the similarity sequence of the terminal device;

[0021] Step 4: File coordination, elimination and abnormal equipment information processing;

[0022] Step 5: The master station verifies the file information adjustment and repeats steps 2 to 4 to update and improve the file information.

[0023] Furthermore, the electrical operation data includes maximum voltage, maximum current, active power, reactive power, electricity, harmonic current and harmonic voltage data.

[0024] Furthermore, the sampling granularity of the terminal device data is 1 to 60 minutes, corresponding to 1440 to 12 data collected per day, and the collection cycle is N. The voltage data of a terminal device in one day is U1, U2...U1440, and the current data is I1, I2, I3...I1440.

[0025] Furthermore, the specific process of step 3 is as follows:

[0026] Step 3.1: Upper and lower level matching: Calculate the topological relationship between the upper and lower level devices through harmonic step information;

[0027] Step 3.1.1: Strong matching of upper and lower level topologies: When a step harmonic occurs in a terminal device, the three-phase active power data of the upper and lower level terminal devices is obtained every minute for similarity matching calculation. The device with the highest similarity is the best match. Combined with the historical data, the terminal device with the most occurrences is selected as the match for the current upper level device. The historical data period is ten days.

[0028] Step 3.1.2: Weak matching of upper and lower level topologies: The three-phase sampled voltage data of the upper and lower level terminal devices is collected every minute for similarity matching calculation. The phase with the highest similarity is the most matched phase. Combined with the historical data, the terminal device with the most occurrences is used as the phase of the current upper level device. The phase information of the strong matching of the upper and lower level topologies is supplemented. The historical data period is ten days.

[0029] Step 3.2: Same-level cluster matching: perform branch matching of devices at the same level based on the similarity between the electrical feature vectors of different devices.

[0030] Furthermore, the specific calculation process of the strong matching of the upper and lower level topologies is as follows:

[0031] Step 3.1.1.1: Select a terminal device and calculate the step relationship matrix between the terminal device and other terminal devices to obtain the step relationship matrix between all terminal devices;

[0032] Step 3.1.1.2: If the ratio of the step relationship matrix of the current terminal device to the total number of steps of the other terminal device over three days is greater than 0.45, then the two terminal devices belong to the same branch. If not, go to step 3.1.1.3;

[0033] Step 3.1.1.3: If the ratio of the step relationship matrix of the current terminal device to the total number of steps of the other terminal device over three days is greater than 0.10, find the maximum value M in the step relationship matrix. The two terminal devices with values ​​between 0.9M and 1.1M are in the same branch.

[0034] Furthermore, the specific process of step 4 is as follows:

[0035] Step 4.1: The master station adds a new terminal device and sends the terminal device profile information to the edge device. The edge device adds the device information to the collection whitelist and collection tasks.

[0036] Step 4.2: The master station performs a secondary calculation based on the topology results sent by all substations. If the calculation shows that a terminal device in the substation does not belong to the substation, the master station re-sends the file excluding the terminal device to the edge device. The edge device is set to the terminal device blacklist and will no longer collect any data from the terminal device. The terminal device will no longer participate in the topology calculation.

[0037] Step 4.3: If the edge device fails to collect data from a terminal device in the archive within a certain period, it is determined that the terminal device is not in the local area or the terminal device has a fault, and the archive information of the terminal device is reported to the master station.

[0038] Furthermore, the master station verifies the adjustment of the file information. If the file information is wrong, the master station modifies the file and re-sends it to the edge device; if the file information is not wrong, the device failure is manually confirmed.

[0039] The beneficial effects of the present invention are: the present invention continuously collaborates with the edge device and the main station to improve the archive, and the topology calculation is more accurate; the topology algorithm is mainly concentrated in the edge device, which is different from the traditional topology calculation deployed at the main station. The present invention does not need to wait for all relevant adjacent substation topology data to be completely uploaded before performing topology calculation, and the calculation cycle is short; and the calculation results can be verified in real time, reducing the cost of manual investigation. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a topology flow chart of collaborative computing between edge devices and the master station of the present invention.

[0041] Figure 2 This is the low-voltage area topology diagram of the present invention.

[0042] Figure 3 This is a flowchart of the strong matching calculation of upper and lower level topologies of the present invention. DETAILED DESCRIPTION

[0043] The present invention is further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention made by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0044] like Figure 1 As shown, the topology collaborative calculation method of the low-voltage area edge device and the master station of the present invention includes the following steps:

[0045] Step 1: Initial file acquisition: the edge device sends a request to the master station for the terminal device file information in the area according to the interface agreed with the master station, and the master station sends the terminal device list information To the edge device, the edge device will Data sets the terminal device whitelist, such as Figure 2 The figure shows the topological structure of the low voltage area;

[0046] Step 2: Collect terminal device data: The edge device periodically collects the electrical operation data of the terminal device contained in the initial file according to the initial file. The sampling granularity of the terminal device data is 1 to 60 minutes, corresponding to 1440 to 12 data collected per day, and the collection period is N, including minute-level data: three-phase sampling current of the terminal device 、 、 , three-phase active power 、 、 , three-phase reactive power 、 、 , three-phase voltage value , , , each single day has a total of 1440 points, and the voltage data of a terminal device in one day is U1, U2...U1440, and the current data is I1, I2, I3...I1440;

[0047] Step 3: Edge topology calculation:

[0048] Step 3.1: Upper and lower level matching: Calculate the topological relationship between the upper and lower level devices through harmonic step information;

[0049] Step 3.1.1: Strong matching of upper and lower level topologies: When step harmonics occur in the terminal equipment, the three-phase active power minute-level data of the upper and lower level terminal equipment is 、 、 , the upper device type is 0, the lower device type is 1, and similarity matching calculation is performed. The one with the highest similarity is the best matching device. Combined with historical data, the terminal device with the most occurrences is taken as the matching item of the current upper device;

[0050] like Figure 3 As shown in the figure, the specific calculation process of strong matching of upper and lower level topologies is as follows:

[0051] Step 3.1.1.1: Select a terminal device and calculate the step relationship matrix between the terminal device and other terminal devices to obtain the step relationship matrix between all terminal devices;

[0052] Step 3.1.1.2: If the ratio of the step relationship matrix of the current terminal device to the total number of steps of the other terminal device over three days is greater than 0.45, then the two terminal devices belong to the same branch. If not, go to step 3.1.1.3;

[0053] Step 3.1.1.3: If the ratio of the step relationship matrix of the current terminal device to the total number of steps of the other terminal device over three days is greater than 0.10, find the maximum value M in the step relationship matrix. The two terminal devices with values ​​between 0.9M and 1.1M are in the same branch.

[0054] Step 3.1.2: Weak matching of upstream and downstream topologies: Take the three-phase sampled voltage data of upstream and downstream terminal devices every minute. , , , the upper device type is 0, the lower device type is 1, and the similarity matching calculation is performed. The one with the highest similarity is the most matching phase. Combined with the historical data, the terminal device with the most occurrences is taken as the phase of the current upper device, and the phase information of the upper and lower topologies with strong matching is supplemented.

[0055] Step 3.2: Same-level cluster matching: perform branch matching of devices at the same level based on the similarity between the electrical feature vectors of different devices;

[0056] Similarity calculation includes original similarity calculation, single-day best similarity calculation and best match calculation within a time period.

[0057] The calculation formula of the original similarity is:

[0058] (1),

[0059] MBF and MBS are meter box numbers. is the similarity of the voltage curves of MBF meter box and MBS meter box on day d, where d is the date number, is the voltage point set of MBF box-type transformer on day d, is the voltage point set of the MBS meter box on day d, i is the terminal equipment number;

[0060] The best similarity match calculation for a single day is to take the maximum similarity between the MBS meter box and all branches within the range on that day. The calculation formula is:

[0061] (2),

[0062] in is the single-day similarity, X is the terminal device similarity sequence,

[0063] The best match calculation within a time period is to sum the best matching branches of the MBS of the meter boxes in n days and take the maximum value. The calculation formula is:

[0064] (3),

[0065] in is the similarity within the time period, X is the similarity sequence of the terminal devices;

[0066] Step 4: File coordination, elimination and abnormal equipment information processing;

[0067] Step 4.1: The master station adds a new terminal device and sends the terminal device profile information to the edge device. The edge device adds the device information to the collection whitelist and collection tasks.

[0068] Step 4.2: The master station performs a secondary calculation based on the topology results sent by all substations. If the calculation shows that a terminal device in the substation does not belong to the substation, the master station re-sends the file excluding the terminal device to the edge device. The edge device is set to the terminal device blacklist and will no longer collect any data from the terminal device. The terminal device will no longer participate in the topology calculation.

[0069] Step 4.3: If the edge device fails to collect data from a terminal device in the archive within a certain period, it will be determined that the terminal device is not in the local area or that the terminal device has a fault, and the archive information of the terminal device will be reported to the master station;

[0070] Step 5: The master station verifies the file information adjustment and repeats steps 2 to 4 to update and improve the file information.

[0071] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A method for topology collaborative calculation between low-voltage area edge devices and a master station, characterized by: The following steps are involved: Step 1: Initial file acquisition: The edge device receives the terminal device file of the corresponding area from the master station and sets the terminal device whitelist based on the terminal device file; Step 2: Collect terminal device data: The edge device periodically collects the electrical operation data of the terminal device contained in the initial file based on the initial file; Step 3: Edge topology calculation: The edge device performs real-time calculations based on the collected appliance operation data, including similarity calculations. The specific process of step 3 is as follows: Step 3.1: Upper and lower level matching: Calculate the topological relationship between the upper and lower level devices through harmonic step information; Step 3.1.1: Strong matching of upper and lower level topologies: When a step harmonic occurs in a terminal device, the three-phase active power data of the upper and lower level terminal devices is obtained every minute for similarity matching calculation. The device with the highest similarity is the best match. Combined with the historical data, the terminal device with the most occurrences is selected as the match for the current upper level device. The historical data period is ten days. Step 3.1.2: Weak matching of upper and lower level topologies: The three-phase sampled voltage data of the upper and lower level terminal devices is collected every minute for similarity matching calculation. The phase with the highest similarity is the most matched phase. Combined with the historical data, the terminal device with the most occurrences is used as the phase of the current upper level device. The phase information of the strong matching of the upper and lower level topologies is supplemented. The historical data period is ten days. Step 3.2: Same-level cluster matching: perform branch matching of devices at the same level based on the similarity between the electrical feature vectors of different devices; The specific calculation process of the strong matching of upper and lower level topologies is as follows: Step 3.1.1.1: Select a terminal device and calculate the step relationship matrix between the terminal device and other terminal devices to obtain the step relationship matrix between all terminal devices; Step 3.1.1.2: If the ratio of the step relationship matrix of the current terminal device to the total number of steps of the other terminal device over three days is greater than 0.45, then the two terminal devices belong to the same branch. If not, go to step 3.1.1.3; Step 3.1.1.3: If the ratio of the step relationship matrix of the current terminal device to the total number of steps of the other terminal device over three days is greater than 0.10, find the maximum value M in the step relationship matrix. The two terminal devices with values ​​between 0.9M and 1.1M are in the same branch. The similarity calculation includes original similarity calculation, single-day best similarity calculation and best match calculation within a time period. The calculation formula of the original similarity is: （1）， MBF and MBS are meter box numbers. is the similarity of the voltage curves of MBF meter box and MBS meter box on day d, where d is the date number, is the voltage point set of the MBF meter box on day d, is the voltage point set of the MBS meter box on day d, i is the terminal device number, n is the total number of terminal devices, is the voltage of the i-th terminal device collected by the MBF meter box on day d, is the voltage of the i-th terminal device collected by the MBS meter box on day d; The best similarity calculation for a single day is to take the maximum similarity between the MBS meter box and all branches within the range on that day. The calculation formula is: （2）， in is the single-day similarity, d is the date number, X is the terminal device similarity sequence, The best match calculation within the time period is to sum the best matching branches of the MBS of the meter boxes in n days and take the maximum value. The calculation formula is: （3）， in is the similarity within the time period, d is the date number, X is the terminal device similarity sequence, and m is the total number of days; Step 4: File coordination, elimination and abnormal equipment information processing; Step 5: The master station verifies the file information adjustment and repeats steps 2 to 4 to update and improve the file information.

2. The method for collaborative topology calculation between low-voltage substation edge devices and a master station according to claim 1 is characterized in that: The electrical appliance operation data includes maximum voltage, maximum current, active power, reactive power, electricity, harmonic current and harmonic voltage data.

3. The method for topology collaborative calculation between low-voltage substation edge devices and a master station according to claim 1 is characterized in that: The sampling granularity of the terminal device data is 1 to 60 minutes, corresponding to 1440 to 12 data collected per day, and the collection cycle is N. The voltage data of a terminal device in one day is U1, U2...U1440, and the current data is I1, I2, I3...I1440.

4. The method for collaborative topology calculation between low-voltage substation edge devices and a master station according to claim 1, characterized in that: The specific process of step 4 is as follows: Step 4.1: The master station adds a new terminal device and sends the terminal device profile information to the edge device. The edge device adds the device information to the collection whitelist and collection tasks. Step 4.2: The master station performs a secondary calculation based on the topology results sent by all substations. If the calculation shows that a terminal device in the substation does not belong to the substation, the master station re-sends the file excluding the terminal device to the edge device. The edge device is set to the terminal device blacklist and will no longer collect any data from the terminal device. The terminal device will no longer participate in the topology calculation. Step 4.3: If the edge device fails to collect data from a terminal device in the archive within a certain period, it is determined that the terminal device is not in the local area or the terminal device has a fault, and the archive information of the terminal device is reported to the master station.

5. The method for collaborative topology calculation between low-voltage substation edge devices and a master station according to claim 1 is characterized in that: The master station verifies the file information adjustment. If the file information is wrong, the master station modifies the file and re-sends it to the edge device; if the file information is correct, the device failure is manually confirmed.

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