CN118688573A - A method and device for analyzing power outage faults in a power distribution area - Google Patents

Abstract

The present invention relates to the technical field of low-voltage distribution networks, and discloses a method and device for analyzing power outage faults in a substation. When receiving a power outage alarm signal, the method obtains a substation physical topology map of several power outage users and power outage substations by parsing the power outage alarm signal; determines one or more suspicious power outage phase lines to which several power outage users belong in a preset phase line user set; performs table search operations and call-up operations on all users under each suspicious power outage phase line, and obtains a set of suspicious power outage users; combines the set of suspicious power outage users with the physical topology map of the substation, and analyzes and obtains suspicious disconnection points and suspicious power outage ranges. The present invention does not need to add redundant hardware power outage communication modules, can save equipment module investment, reduce the difficulty of equipment operation and maintenance, and meets the accuracy, economy, and applicability requirements of substation fault power outage analysis.

Description

A method and device for analyzing power outage faults in a power distribution area

Technical Field

The present invention relates to the technical field of low-voltage distribution network, and in particular to a method and device for analyzing and judging power outage faults in a substation area.

Background Art

The low-voltage power grid has complex lines and frequent power outages. After a power outage occurs, the sooner the power grid company discovers the power outage and the more accurately it locates the power outage, the faster it can start power outage repairs and restore power supply, thereby minimizing power outage losses and improving the level of electricity service. Therefore, in recent years, the methods and means of judging low-voltage power outages have been a hot topic of research. There are two common methods for judging power outages, one is the signal method and the other is the data method. The signal method is to automatically determine the power outage status through the smart meter at the moment of the power outage, and then send out the power outage signal, usually supported by the meter capacitor. The broadband carrier module sends the signal. However, if the power outage is caused by a cable break, the carrier signal cannot pass through the break, resulting in a failure to send the signal. In order to cope with this situation, dual-mode communication technology has emerged in the past two years, namely broadband carrier + low-power wireless dual-in-one, broadband carrier as the main channel, low-power wireless as the secondary channel, the main channel sends data when the power supply is normal, and the wireless channel sends the power outage signal when the line is out of power. The data method generally collects abnormal voltage, abnormal power data, and network topology data to jointly determine suspicious power outage users and power outage areas, and then verifies, further narrows down, and clarifies the areas and users through real-time call testing and other means.

Both the current signal method and the data method have defects. The signal method is mainly determined by communication technology. The dual-mode communication module increases the equipment investment and the difficulty of equipment operation and maintenance. The operation and maintenance of massive low-voltage communication modules is an issue that must be considered. At the same time, when a large-scale power outage occurs, a large number of power outage signals are sent at the same time, which will cause signal congestion and loss to both the carrier channel and the micro-power wireless channel, resulting in inaccurate judgment results. The data method has two main defects. First, since the basic data comes from communication collection, the most significant feature of the low-voltage communication channel is the lack of stability, and data loss often occurs. The current data methods are too ideal, and the algorithm does not include tolerance, adjustment and correction for various situations of data loss. As a result, the theoretical calculation method is very ideal, but it cannot reflect the actual power outage situation in engineering applications. Missed judgments and misjudgments often occur. Every misjudgment may cause the repair personnel to go to the wrong power outage area, delaying the repair time. Second, power outage analysis must be combined with an accurate physical topology network, and the sorting out of low-voltage topology is itself a systematic problem. Current data methods either intentionally ignore the topology network and directly assume that the topology is 100% accurate, which is not applicable in an environment where the low-voltage topology changes frequently; or they directly ignore the topology network and use the communication network instead, which will also cause repair personnel to be assigned to the wrong location, delaying the repair time.

Summary of the invention

The present invention provides a method and device for analyzing power outage faults in a substation area, which does not require the addition of redundant hardware power outage communication modules, can save equipment module investment, reduce the difficulty of equipment operation and maintenance, and meet the accuracy, economy, and applicability requirements of power outage fault analysis in substation areas.

In order to solve the above technical problems, the present invention provides a method for analyzing and judging power outage faults in a transformer substation, comprising:

When a power outage alarm signal is received, a physical topology diagram of a plurality of power outage users and power outage stations is obtained by parsing the power outage alarm signal;

Determine one or more suspected power outage phase lines to which several power outage users belong in a preset phase line user set; wherein the phase line user set includes several same-phase user sets;

Perform table search and call test operations on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users;

The set of suspected power outage users is combined with the physical topology map of the substation area to analyze and obtain the suspected disconnection points and the suspected power outage range.

Furthermore, the table search operation and the call test operation are respectively performed on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users, specifically:

Perform a table search operation on all users under each of the suspected power outage phase lines, and add users whose table search fails to the first power outage user set;

Perform a call test operation on all users under each of the suspected power outage phase lines, and add users whose real-time call test power is 0 to the second power outage user set;

The first power outage user set and the second power outage user set are merged to form a suspicious power outage user set.

Furthermore, when a power outage alarm signal is received, a physical topology diagram of a plurality of power outage users and power outage stations is obtained by parsing the power outage alarm signal, specifically:

Analyze the power outage alarm signal to obtain alarm information and the power outage area to which the alarm information belongs;

Obtaining a number of power outage users from the alarm information;

Obtain the physical topology map of the outage area in the preset database.

Furthermore, the method for generating the warning information includes one or more combinations of the following:

When a power outage repair call is received, the user associated with the power outage repair call is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated;

When a power outage signal from an electric meter is received, a user associated with the power outage signal from the electric meter is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated;

When a current sequence suddenly changing to 0 is collected, the user associated with the current sequence suddenly changing to 0 is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated.

Furthermore, the preset split-phase line user set is specifically:

Collect several voltage monitoring data of all users in the outage area according to the preset period;

Normalize several voltage monitoring data of each user;

The voltage monitoring data of each user and all other users in the outage area are sequentially subjected to curve similarity calculations, and a number of same-phase user subsets are formed according to the calculation results; wherein the number of the same-phase user subsets is the same as the number of users in the outage area;

By using the method of merging similar items, a number of the same-phase user subsets are iteratively merged to form a preset number of same-phase user sets, thereby generating a split-phase line user set.

Furthermore, the voltage monitoring data of each user and all other users in the outage area are sequentially subjected to curve similarity calculations, and several in-phase user subsets are formed according to the calculation results, specifically:

For the first user, a dynamic time warping algorithm is used to calculate the curve similarity between the voltage monitoring data of the first user and the voltage monitoring data of the remaining users in the outage area;

A preset number of users with the highest similarity are added to the same-phase user subset of the first user.

Furthermore, the suspicious power outage user set is combined with the physical topology map of the substation area to analyze and obtain the suspicious disconnection location and the suspected power outage range, specifically:

Marking corresponding locations of several suspicious power outage users on the physical topology map of the substation according to the suspicious power outage user set;

Determine the suspected disconnection point in front of the electric meter of the suspected power outage user located first on the physical topology map of the substation area;

The suspected power outage scope is determined based on the suspected disconnection location.

Furthermore, after combining the set of suspected power outage users with the physical topology map of the substation area to analyze and obtain the suspected disconnection location and the suspected power outage range, the method further includes:

The suspected disconnection point and the suspected power outage range are sent to relevant emergency repair personnel, so that the relevant emergency repair personnel can conduct fault investigation and fault handling based on the suspected disconnection point.

Furthermore, before obtaining the physical topology map of a plurality of power outage users and power outage stations by parsing the power outage alarm signal, the method further includes:

When a power outage alarm signal is received, a preset fault judgment method is used to judge whether the fault type corresponding to the power outage alarm signal is a power outage alarm for the entire substation area or a power outage alarm for all substation branches;

If it is determined that the power outage alarm signal is a power outage alarm for the entire area, the fault processing is performed according to the preset power outage processing operation for the entire area;

If the power outage alarm signal is determined to be a total power outage alarm for the substation branch, the fault processing is performed according to the preset substation branch total power outage processing operation.

The present invention provides a method for analyzing power outage faults in a substation area. Under the premise of considering the influence of the similarity of physical locations on voltage sequences, similarity calculation and minimum range clustering methods are used to classify all users under the substation area, and a phase line user set is obtained, thereby avoiding the inadaptability of common automatic clustering methods to on-site conditions. The present invention fully considers the power outage time, the situation that all users on the same line are out of power after the line break point, and the broadband carrier cannot communicate normally after the power outage. The two means of table search and group call test are combined to screen out a set of suspicious power outage users, and the suspicious power outage user set is combined with the physical topology map to obtain a fault analysis result. It can effectively consider various actual situations such as on-site communication and topology, adapt to various on-site operating environments to the maximum extent, and meet the accuracy, economy, and applicability requirements of power outage analysis in substation areas. The present invention belongs to the data analysis method, does not need to add redundant hardware power outage communication modules, can save equipment module investment, and reduce the difficulty of equipment operation and maintenance.

Accordingly, the present invention provides a device for analyzing and judging power outage faults in a transformer substation, comprising: an acquisition module, a phase line determination module, a table search and call module, and an analysis module;

The acquisition module is used for acquiring a physical topology map of a plurality of power outage users and power outage stations by analyzing the power outage alarm signal when receiving the power outage alarm signal;

The phase line determination module is used to determine one or more suspected power outage phase lines to which several power outage users belong in a preset phase line user set; wherein the phase line user set includes several same-phase user sets;

The table search and call test module is used to perform table search and call test operations on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users;

The analysis module is used to combine the set of suspected power outage users with the physical topology map of the substation area, and analyze and obtain the suspected disconnection points and the suspected power outage range.

The present invention provides a power outage fault analysis device for a substation area. Based on the organic combination of modules, and considering the similarity of the physical location to the voltage sequence, similarity calculation and minimum range clustering methods are used to classify all users under the substation area, and a phase line user set is obtained, thereby avoiding the inadaptability of common automatic clustering methods to on-site conditions. The present invention fully considers the power outage time, the situation that all users on the same line are out of power after the line break point, and the broadband carrier cannot communicate normally after the power outage. The two means of table search and group call test are combined to screen out a set of suspicious power outage users, and the suspicious power outage user set is combined with the physical topology map to obtain a fault analysis result. It can effectively consider various actual situations such as on-site communication and topology, and adapt to various on-site operating environments to the maximum extent, meeting the accuracy, economy, and applicability requirements of the power outage analysis of the substation area. The present invention belongs to the data analysis method, does not need to add redundant hardware power outage communication modules, can save equipment module investment, and reduce the difficulty of equipment operation and maintenance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a flow chart of an embodiment of a method for analyzing and determining a power outage fault in a transformer area provided by the present invention;

FIG2 is a schematic structural diagram of an embodiment of a low-voltage station area provided by the present invention;

FIG3 is a flow chart of another embodiment of a method for analyzing and determining a power outage fault in a transformer area provided by the present invention;

FIG4 is a schematic structural diagram of an embodiment of a device for analyzing and determining power outage faults in a transformer substation provided by the present invention.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

The flowcharts shown in the accompanying drawings are only examples and do not necessarily include all the contents and operations/steps, nor must they be executed in the order described. For example, some operations/steps may also be decomposed, combined or partially merged, so the actual execution order may change according to actual conditions.

Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

Example 1

Referring to FIG. 1 , it is a flow chart of an embodiment of a method for analyzing and determining a power outage fault in a transformer area provided by the present invention. The method includes steps 101 to 104, and each step is specifically as follows:

Step 101: When a power outage alarm signal is received, a physical topology map of a plurality of power outage users and power outage stations is obtained by parsing the power outage alarm signal.

Furthermore, in the first embodiment of the present invention, before obtaining a physical topology map of a plurality of power outage users and power outage stations by parsing the power outage alarm signal, the method further includes:

When a power outage alarm signal is received, a preset fault judgment method is used to judge whether the fault type corresponding to the power outage alarm signal is a power outage alarm for the entire substation area or a power outage alarm for all substation branches;

If it is determined that the power outage alarm signal is a power outage alarm for the entire area, the fault processing is performed according to the preset power outage processing operation for the entire area;

If the power outage alarm signal is determined to be a total power outage alarm for the substation branch, the fault processing is performed according to the preset substation branch total power outage processing operation.

In the first embodiment of the present invention, referring to FIG. 2, it is a structural schematic diagram of an embodiment of the low-voltage substation provided by the present invention. The low-voltage substation includes a metering automation master station and a substation transformer connected to the metering automation master station. The substation transformer is connected to the user's electric meter under each branch through a branch switch, and all the same-phase users are connected to the same split-phase line under the same branch. The low-voltage substation power outage type can be divided into four types according to the power outage area: a full substation power outage (case 1), a full branch line power outage (case 2), a partial line break power outage under the branch line (case 3) and a single-user indoor power outage (case 4). When the power outage type is a full substation power outage, the substation concentrator has power outage signals such as 0 current and 0 power, and there is no need to go deep into the low-voltage area below the substation for judgment. The judgment method of the full substation power outage is relatively easy and has a high accuracy rate. When the power outage type is a full branch line power outage, the branch monitoring module and the branch switch of the substation concentrator have power outage signal alarms. The judgment method of the full branch line power outage is easy to implement, and it is also a relatively easy and accurate judgment method. Therefore, when receiving the power outage alarm signal, the two types of faults can be quickly determined by using the method of judging the power outage of the entire area and the power outage of the entire branch line, so as to adopt the corresponding fault handling means to solve the power outage fault. When the power outage type is a partial line break under the branch line, this type of power outage is the most common and most complicated situation. The low-voltage network topology is a tree structure. It is often caused by construction, cable or equipment failures and other problems that cause a part of a line under a branch to be broken, resulting in power outages for users behind the line. This type of power outage accounts for more than 80% of low-voltage power outage events, so partial line breakage under the branch line is the most common; the low-voltage network is complex, especially in urban villages, streets and other areas in large cities. When the physical network topology is missing and the communication channel is not in good condition, it is difficult to quickly and accurately locate the users who have lost power, so partial line breakage under the branch line is the most complicated. When the power outage type is a single-user indoor power outage, this type of power outage usually occurs because the user's indoor electrical equipment is abnormal, causing the switch behind the meter to trip, and has nothing to do with the low-voltage power grid. However, how to determine the type of power outage for a single-user indoor power outage is also relatively complicated. Therefore, for the two types of power outages caused by partial disconnection under the branch line and single-user indoor power outages, further fault analysis is required to determine the fault point and solve the power outage fault.

Further, in the first embodiment of the present invention, when a power outage alarm signal is received, a physical topology diagram of a plurality of power outage users and power outage stations is obtained by parsing the power outage alarm signal, specifically:

Analyze the power outage alarm signal to obtain alarm information and the power outage area to which the alarm information belongs;

Obtaining a number of power outage users from the alarm information;

Obtain the physical topology map of the outage area in the preset database.

Furthermore, in the first embodiment of the present invention, the method for generating the warning information includes one or more combinations of the following:

When a power outage repair call is received, the user associated with the power outage repair call is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated;

When a power outage signal from an electric meter is received, a user associated with the power outage signal from the electric meter is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated;

When a current sequence suddenly changing to 0 is collected, the user associated with the current sequence suddenly changing to 0 is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated.

In the first embodiment of the present invention, when a power outage signal arrives at the master station, the master station starts the power outage fault analysis process. The power outage signal may be a user's power outage repair phone call, a power outage signal sent by an electric meter, or a sudden change of the current sequence collected by the master station to 0. When the master station receives the above power outage signals, it identifies the user associated with the power outage signal, stores it in the alarm information, and generates a power outage alarm signal.

Step 102: Determine one or more suspected power outage phase lines to which several power outage users belong in a preset phase line user set; wherein the phase line user set includes several same-phase user sets.

In the first embodiment of the present invention, when a phase line is disconnected, all users behind the disconnection point will be cut off from power supply, with the disconnection point as the boundary. For the type of power outage caused by partial disconnection of the branch line, when the power outage phase line and the power outage user set are accurately determined, it is helpful to quickly locate the disconnection point and improve the efficiency of emergency repair. The basis for accurately determining the power outage phase line and the power outage user set is the accurate set of all users contained in each phase line during normal power supply. The present invention uses the similarity calculation of the voltage data sequence and the minimum range clustering method to obtain the phase line user set. Among them, the similarity calculation is based on the significant differences of the different phase data sequences caused by the angular difference between the phases, and the minimum range clustering fully considers the influence of the physical location on the similarity of the voltage sequence. The closer the physical location is, the closer the two users in the same phase are, the higher the similarity of the voltage curve. Generating the phase line user set means classifying the users corresponding to the phase line, which provides a data basis for determining the power outage phase line and the power outage user set.

Furthermore, in the first embodiment of the present invention, the preset split-phase line user set is specifically:

Collect several voltage monitoring data of all users in the outage area according to the preset period;

Normalize several voltage monitoring data of each user;

The voltage monitoring data of each user and all other users in the outage area are sequentially subjected to curve similarity calculations, and a number of same-phase user subsets are formed according to the calculation results; wherein the number of the same-phase user subsets is the same as the number of users in the outage area;

By using the method of merging similar items, a number of the same-phase user subsets are iteratively merged to form a preset number of same-phase user sets, thereby generating a split-phase line user set.

Furthermore, in the first embodiment of the present invention, curve similarity calculations are performed on the voltage monitoring data of each user and all remaining users in the outage area in turn, and several in-phase user subsets are formed according to the calculation results, specifically:

For the first user, a dynamic time warping algorithm is used to calculate the curve similarity between the voltage monitoring data of the first user and the voltage monitoring data of the remaining users in the outage area;

A preset number of users with the highest similarity are added to the same-phase user subset of the first user.

As an example of the first embodiment of the present invention, it is assumed that there are i users in the substation, namely [N1, N2, N3...Ni]. The metering automation master station can obtain the voltage monitoring data of each user in each substation for one day through regular call-up, such as an average of 1 point voltage data every 15 minutes, and a total of 96 point voltage data can be obtained in one day. The 96 point voltage data of each user are normalized, and the curve similarity calculation is performed one by one between user i and all other users in the same substation using the DTW (dynamic time warping) algorithm, and the 5 users with the highest similarity values are taken as the same-phase user subset of user i. The same calculation is performed on other users in the substation, and the same-phase user subsets of i users can be obtained, thereby obtaining a total of i same-phase user subsets. The total i same-phase user subsets are merged two by two similar items, that is, if two subsets contain the same user, they are merged into a new subset; after multiple rounds of iterative merging, n (n>=3) phase line user sets will be finally generated, and the users contained in each set belong to the same phase line.

In the first embodiment of the present invention, a dynamic time warping algorithm is selected to calculate curve similarity. This is because it is difficult to completely synchronize the time of two curves. In the case of curve translation, the dynamic time warping algorithm will have a better effect. The present invention can use other alternative algorithms for curve similarity calculation.

In the first embodiment of the present invention, after obtaining the phase line user set, the user associated with the power outage alarm signal is compared with the users in each phase line user set, so as to obtain the phase line user set including the power outage user, identify the phase line as a suspected power outage phase line, and send the phase line identification to the substation concentrator. Among them, the power outage users may be scattered on different phase lines, so when comparing the phase line user set with the power outage users, it is possible to obtain multiple suspected power outage phase lines.

Step 103: Perform table search and test call operations on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users.

Further, in the first embodiment of the present invention, table search operations and call test operations are performed on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users, specifically:

Perform a table search operation on all users under each of the suspected power outage phase lines, and add users whose table search fails to the first power outage user set;

Perform a test call operation on all users under each of the suspected power outage phase lines, and add users whose real-time test power is 0 to the second power outage user set;

The first power outage user set and the second power outage user set are merged to form a suspicious power outage user set.

In the first embodiment of the present invention, after obtaining the suspected power outage phase line, the meter search and call test of all users under the phase line are started respectively. Specifically, the meter search of all users under the suspected power outage phase line is started by the substation concentrator, and the users who cannot be searched are included in the power outage user set 1, and the data is transmitted back to the main station; the substation concentrator is used to continue to start the group call test of all users under the suspected power outage phase line, and the real-time power is measured, and the users with real-time power of 0 are included in the power outage user set 2, and the data is transmitted back to the main station; the main station merges the power outage user set 1 and the power outage user set 2 to generate a suspected power outage user set.

Step 104: Combine the set of suspected power outage users with the physical topology map of the substation area to analyze and obtain the suspected disconnection points and the suspected power outage range.

Furthermore, in the first embodiment of the present invention, the set of suspected power outage users is combined with the physical topology map of the substation area to analyze and obtain the suspected disconnection location and the suspected power outage range, specifically:

Marking corresponding locations of several suspicious power outage users on the physical topology map of the substation according to the suspicious power outage user set;

Determine the suspected disconnection point in front of the electric meter of the suspected power outage user located first on the physical topology map of the substation area;

The suspected power outage scope is determined based on the suspected disconnection location.

In the first embodiment of the present invention, the low-voltage substation maintains a clear and accurate physical topology map, which can display the front and back physical position relationship of each user on each phase line. Therefore, after obtaining a set of suspected power outage users, it is combined with the physical topology map to analyze the suspected power outage range and line break location. The suspected line break location is located in front of the electric meter of the user who ranks first on the physical topology map in the power outage set.

Furthermore, in the first embodiment of the present invention, after combining the set of suspected power outage users with the physical topology map of the substation area and analyzing and obtaining the suspected disconnection location and the suspected power outage range, the method further includes:

The suspected disconnection point and the suspected power outage range are sent to relevant emergency repair personnel, so that the relevant emergency repair personnel can conduct fault investigation and fault handling based on the suspected disconnection point.

In the first embodiment of the present invention, the suspected power outage user set, suspected disconnection location, and suspected power outage range are sent to the emergency repair personnel. After the emergency repair personnel arrive at the scene, they start troubleshooting from the suspected disconnection location to determine the actual disconnection location, thereby carrying out emergency repairs and solving the power outage fault. For the substation area without a physical topology map, the emergency repair personnel can find the first user on the line through their own understanding of the line and the received suspected power outage user set, and then start troubleshooting.

As an example of the first embodiment of the present invention, refer to Figure 3, which is a flow chart of another embodiment of the method for power outage fault analysis and judgment of a substation provided by the present invention. When the metering automation master station receives a power outage alarm, after excluding the power outage alarm of the entire substation area and the power outage alarm of the entire substation branch, the line break power outage fault point analysis is started; the master station identifies the users associated with the power outage signal, and finds the phase line set that includes the power outage users from the set of all phase line users under the substation area, identifies the phase line as a suspected power outage phase line, and sends the suspected power outage phase line identifier to the substation concentrator; the substation concentrator starts the table search of all users under the suspected power outage phase line, and for the user subset that cannot be searched, it is included in the suspected power outage user set 1 and sent back to the master station; the substation concentrator continues to start The group call test of all users under the phase line is carried out to test the real-time power, and the users with real-time power of 0 are included in the suspicious power outage user set 2, and the data is transmitted back to the main station; the main station merges the suspicious power outage user set 1 and the suspicious power outage user set 2 to generate the suspicious power outage user set 3; the main station combines the suspicious power outage user set 3 with the physical topology map of the outage station area, and analyzes the suspected power outage range and the disconnection point; the main station sends the suspected disconnection point and the suspicious power outage user set to the emergency repair personnel, so that the emergency repair personnel can arrive at the suspected disconnection point on site to conduct fault investigation, determine the actual disconnection point, carry out emergency repair, and restore the fault.

In summary, the first embodiment of the present invention provides a method for analyzing power outage faults in a substation area. Under the premise of considering the influence of the similarity of physical locations on voltage sequences, similarity calculation and minimum range clustering methods are used to classify all users under the substation area, and a set of phase-line users is obtained, thereby avoiding the inadaptability of common automatic clustering methods to on-site conditions. The present invention fully considers the power outage time, the situation where all users on the same line are out of power after the line break point, and the broadband carrier cannot communicate normally after the power outage. It combines the two means of table search and group call test to screen out a set of suspicious power outage users, and combines the suspicious power outage user set with the physical topology map to obtain a fault analysis result. It can effectively consider various actual situations such as on-site communication and topology, and adapt to various on-site operating environments to the maximum extent, meeting the accuracy, economy, and applicability requirements of power outage analysis in substation areas. The present invention belongs to the data analysis method, does not need to add redundant hardware power outage communication modules, can save equipment module investment, and reduce the difficulty of equipment operation and maintenance.

Example 2

4 is a schematic diagram of the structure of an embodiment of a device for analyzing and determining a power outage fault in a transformer area provided by the present invention, the device includes an acquisition module 201, a phase line determination module 202, a table search and call module 203, and an analysis module 204;

The acquisition module 201 is used for obtaining a physical topology map of a plurality of power outage users and power outage stations by parsing the power outage alarm signal when receiving the power outage alarm signal;

The phase line determination module 202 is used to determine one or more suspected power outage phase lines to which several power outage users belong in a preset phase line user set; wherein the phase line user set includes several same-phase user sets;

The table search and call test module 203 is used to perform table search and call test operations on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users;

The analysis module 204 is used to combine the set of suspected power outage users with the physical topology map of the substation area, and analyze and obtain the suspected disconnection points and the suspected power outage range.

Further, in the second embodiment of the present invention, table search operation and call test operation are respectively performed on all users under each of the suspected power outage phase lines to obtain a set of suspected power outage users, specifically:

Perform a table search operation on all users under each of the suspected power outage phase lines, and add users whose table search fails to the first power outage user set;

Perform a call test operation on all users under each of the suspected power outage phase lines, and add users whose real-time call test power is 0 to the second power outage user set;

The first power outage user set and the second power outage user set are merged to form a suspicious power outage user set.

Further, in the second embodiment of the present invention, when a power outage alarm signal is received, a physical topology diagram of a plurality of power outage users and power outage stations is obtained by parsing the power outage alarm signal, specifically:

Analyze the power outage alarm signal to obtain alarm information and the power outage area to which the alarm information belongs;

Obtaining a number of power outage users from the alarm information;

Obtain the physical topology map of the outage area in the preset database.

Furthermore, in the second embodiment of the present invention, the method for generating the warning information includes one or more combinations of the following:

When a power outage repair call is received, the user associated with the power outage repair call is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated;

When a power outage signal from an electric meter is received, a user associated with the power outage signal from the electric meter is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated;

When a current sequence suddenly changing to 0 is collected, the user associated with the current sequence suddenly changing to 0 is determined as a power outage user, and the power outage user is stored in the alarm information, and a power outage alarm signal is generated.

Furthermore, in the second embodiment of the present invention, the preset split-phase line user set is specifically:

Collect several voltage monitoring data of all users in the outage area according to the preset period;

Normalize several voltage monitoring data of each user;

The voltage monitoring data of each user and all other users in the outage area are sequentially subjected to curve similarity calculations, and a number of same-phase user subsets are formed according to the calculation results; wherein the number of the same-phase user subsets is the same as the number of users in the outage area;

By using the method of merging similar items, a number of the same-phase user subsets are iteratively merged to form a preset number of same-phase user sets, thereby generating a split-phase line user set.

Furthermore, in the second embodiment of the present invention, the voltage monitoring data of each user and all the remaining users in the outage area are sequentially subjected to curve similarity calculations, and a number of in-phase user subsets are formed according to the calculation results, specifically:

For the first user, a dynamic time warping algorithm is used to calculate the curve similarity between the voltage monitoring data of the first user and the voltage monitoring data of the remaining users in the outage area;

A preset number of users with the highest similarity are added to the same-phase user subset of the first user.

Furthermore, in the second embodiment of the present invention, the set of suspected power outage users is combined with the physical topology of the substation area to analyze and obtain the suspected disconnection location and the suspected power outage range, specifically:

Marking corresponding locations of several suspicious power outage users on the physical topology map of the substation according to the suspicious power outage user set;

Determine the suspected disconnection point in front of the electric meter of the suspected power outage user located first on the physical topology map of the substation area;

The suspected power outage scope is determined based on the suspected disconnection location.

Furthermore, in the second embodiment of the present invention, after combining the set of suspected power outage users with the physical topology map of the substation area and analyzing and obtaining the suspected disconnection location and the suspected power outage range, the method further includes:

The suspected disconnection point and the suspected power outage range are sent to relevant emergency repair personnel, so that the relevant emergency repair personnel can conduct fault investigation and fault handling based on the suspected disconnection point.

Furthermore, in the second embodiment of the present invention, before obtaining a physical topology map of a plurality of power outage users and power outage stations by parsing the power outage alarm signal, the method further includes:

When a power outage alarm signal is received, a preset fault judgment method is used to judge whether the fault type corresponding to the power outage alarm signal is a power outage alarm for the entire substation area or a power outage alarm for all substation branches;

If it is determined that the power outage alarm signal is a power outage alarm for the entire area, the fault processing is performed according to the preset power outage processing operation for the entire area;

If the power outage alarm signal is determined to be a total power outage alarm for the substation branch, the fault processing is performed according to the preset substation branch total power outage processing operation.

In summary, the second embodiment of the present invention provides a device for analyzing and judging power outage faults in a substation area. Based on the organic combination of modules, and considering the influence of the physical location on the similarity of the voltage sequence, similarity calculation and minimum range clustering methods are used to classify all users under the substation area, and a set of phase-line users is obtained, thereby avoiding the inadaptability of common automatic clustering methods to on-site conditions. The present invention fully considers the power outage time, the situation where all users on the same line are out of power after the line break point, and the broadband carrier cannot communicate normally after the power outage. It combines the two means of table search and group call test to screen out a set of suspicious power outage users, and combines the suspicious power outage user set with the physical topology map to obtain a fault analysis result, which can effectively consider various actual situations such as on-site communication and topology, and adapt to various on-site operating environments to the maximum extent, meeting the accuracy, economy, and applicability requirements of power outage analysis and judgment of substation faults. The present invention belongs to the data analysis method, does not need to add redundant hardware power outage communication modules, can save equipment module investment, and reduce the difficulty of equipment operation and maintenance.

The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims (10)

1. The method for judging the power failure of the transformer area is characterized by comprising the following steps of:

When a power failure alarm signal is received, a plurality of power failure users and a station area physical topological graph of a station area are obtained by analyzing the power failure alarm signal;

Determining one or more suspicious power outage split-phase lines to which a plurality of power outage users belong in a preset split-phase line user set; the split-phase line user set comprises a plurality of in-phase user sets;

Performing table searching operation and calling operation on all users under each suspicious power outage split phase line respectively to obtain a suspicious power outage user set;

and combining the suspicious power outage user set with the physical topological graph of the platform area, and analyzing to obtain suspicious broken line positions and suspicious power outage ranges.

2. The method for studying and judging power failure of transformer area according to claim 1, wherein the searching operation and the calling operation are performed on all users under each suspected power failure branch line respectively to obtain a suspected power failure user set, specifically:

performing table searching operation on all users under each suspicious power outage split phase line, and adding users failing in table searching to a first power outage user set;

Carrying out a recall operation on all users under each suspicious power outage split line, and adding the users with real-time recall power of 0 to a second power outage user set;

and merging the first power failure user set and the second power failure user set to form a suspicious power failure user set.

3. The method for studying and judging power outage faults of a station area according to claim 1, wherein when the power outage alarm signals are received, the power outage alarm signals are analyzed to obtain a plurality of physical topological diagrams of the station area of a power outage user and a power outage area, and the method is characterized in that:

Analyzing the power failure alarm signal to obtain alarm information and a power failure station area to which the alarm information belongs;

Acquiring a plurality of power failure users from the alarm information;

and obtaining a physical topological graph of the station area of the station stopping area from a preset database.

4. The method for studying and judging a power outage fault of a station according to claim 3, wherein the method for generating the alarm information comprises one or more of the following combinations:

When a power failure report repair call is received, determining a user associated with the power failure report repair call as a power failure user, storing the power failure user in alarm information, and generating a power failure alarm signal;

When an ammeter power failure signal is received, determining a user related to the ammeter power failure signal as a power failure user, and storing the power failure user in alarm information to generate a power failure alarm signal;

When a current sequence with abrupt change of 0 is acquired, determining a user associated with the current sequence with abrupt change of 0 as a power failure user, storing the power failure user in alarm information, and generating a power failure alarm signal.

5. The method for studying and judging power failure of a station area according to claim 1, wherein the preset split-phase line user set specifically comprises:

collecting a plurality of voltage monitoring data of all users in a radio stopping area according to a preset period;

Normalizing a plurality of voltage monitoring data of each user;

Carrying out curve similarity calculation on voltage monitoring data of each user and all the remaining users in the radio stopping area in sequence, and forming a plurality of in-phase user subsets according to calculation results; the number of the in-phase user subsets is the same as the number of users in the power failure station area;

and carrying out iterative combination on a plurality of in-phase user subsets by utilizing a combination similar term method to form a preset number of in-phase user sets, and generating a split-phase line user set.

6. The method for studying and judging power failure of transformer area according to claim 5, wherein the steps of sequentially calculating the curve similarity of the voltage monitoring data of each user and all the remaining users in the power failure area, and forming a plurality of in-phase user subsets according to the calculation result are as follows:

for a first user, adopting a dynamic time warping algorithm to respectively calculate curve similarity between the voltage monitoring data of the first user and the voltage monitoring data of each user remained in the power failure station area;

And adding the preset number of users with highest similarity to the in-phase user subset of the first user.

7. A method for studying and judging a power outage fault in a transformer area according to claim 2 or claim 3, wherein the step of combining the suspicious power outage user set with the physical topology map of the transformer area is performed to analyze and obtain suspicious power outage positions and suspicious power outage ranges, specifically:

Marking a plurality of corresponding suspicious power outage user positions on the physical topological graph of the platform area according to the suspicious power outage user set;

determining the position of the suspicious power outage user arranged at the first position on the physical topological graph of the platform area as the suspicious disconnection position;

And determining a suspicious power outage range according to the suspicious broken line.

8. The method for studying and judging a power outage fault of a station area according to claim 7, wherein after said combining the suspicious power outage user set with the physical topology of the station area, analyzing to obtain suspicious broken lines and suspicious power outage ranges, further comprising:

sending the suspicious broken line position and the suspicious power outage range to related rush-repair personnel so that the related rush-repair personnel can conduct fault investigation according to the suspicious broken line position and conduct fault processing.

9. The method for studying and judging power outage faults of a station according to claim 3, further comprising, before the step of obtaining a plurality of physical topological graphs of power outage subscribers and a power outage zone by analyzing the power outage alarm signals:

When a power failure alarm signal is received, judging whether the fault type corresponding to the power failure alarm signal is a full-station power failure alarm or a station-area branch full-power failure alarm by using a preset fault judging method;

if the power failure warning signal is judged to be the power failure warning of the whole area, performing fault processing according to the preset power failure processing operation of the whole area;

if the power failure warning signal is judged to be the station branch full power failure warning, fault processing is carried out according to the preset station branch full power failure processing operation.

10. The utility model provides a district power failure research judgement device which characterized in that includes: the device comprises an acquisition module, a split-phase line determination module, a table searching and calling module and an analysis module;

the acquisition module is used for acquiring a plurality of power failure users and a station area physical topological graph of the station area through analyzing the power failure alarm signal when the power failure alarm signal is received;

the phase-splitting line determining module is used for determining one or more suspicious power-outage phase-splitting lines of a plurality of power-outage users in a preset phase-splitting line user set; the split-phase line user set comprises a plurality of in-phase user sets;

the meter searching and calling module is used for respectively performing meter searching operation and calling operation on all users under each suspicious power outage phase separation line to obtain a suspicious power outage user set;

and the analysis module is used for combining the suspicious power outage user set with the physical topological graph of the platform area to analyze and obtain suspicious broken line positions and suspicious power outage ranges.