Abnormal monitoring method for traction power supply system

Abstract

The invention belongs to the technical field of electrified railway monitoring, and aims to provide a traction power supply system abnormity monitoring method. After the data are collected, the fluctuation range of the traction backflow branch current proportion of each branch is further obtained according to the collected data so as to carry out traction backflow branch current value abnormity monitoring on each branch, and real-time abnormity monitoring and abnormity early warning can be carried out on appointed performance parameter values of the grounding device. Refined analysis and correlation analysis of multi-dimensional data are achieved, data support can be provided for design or transformation of a traction backflow device and a grounding device for an operation and maintenance management department of the electrified railway, and long-term safe and stable operation of the electrified railway is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of electrified railway monitoring, and in particular relates to a method for monitoring abnormalities in a traction power supply system. Background Art

[0002] Electrified railway refers to a railway that uses electric traction. It is an important part of modern transportation. The traction power supply system is a key component of the electrified railway. Ensuring the safe, stable, efficient and energy-saving operation of the traction power supply system is of great significance to the development of the national economy. In the traction power supply system, the traction return device and the grounding device are the fundamental guarantee for maintaining the safe and reliable operation of the railway and ensuring the safety of operating personnel and electrical equipment. They play an extremely important role in the stable and reliable operation of the traction power supply system.

[0003] Specifically, my country's electrified railway traction power supply system usually adopts direct power supply with return line and AT power supply. The return path includes track return, wire (cable) return and ground return, such as Figure 1 The figure shows the existing traction return current diagram. When the traction power supply system is in normal operation, the current proportion of the traction return branch of each branch is basically stable. If the traction return current is not smooth, some lines and rails will be subjected to large currents, resulting in hidden dangers such as arcing of train insulation nodes, burning of short leads, burning of rails and damage to electrical equipment, and the risk of train suspension and maintenance, or even train accidents.

[0004] The grounding device in the station is mainly responsible for the safe discharge of lightning current and short-circuit fault current in the station, and also has the current-carrying function of the traction return current of the contact network. Especially when passing a train, the grounding device needs to bear the peak load, and the traction return value in the station will reach the peak value. At this time, the specified performance parameters of the grounding device in the station (ground potential, step potential difference and contact potential difference on the 27.5kV side) reach the maximum simultaneously. This is also the time when the safety risk of the grounding device is the highest. Its safety is directly related to the safety of railway equipment and personnel, as well as the reliable operation of the railway system.

[0005] In the prior art, there are monitoring devices for traction return current and grounding device parameters, so that workers can monitor whether there are abnormal conditions. However, in the process of using the prior art, the inventors found that there are at least the following problems in the prior art: Due to the frequency of data collection, it is easy to miss data when simultaneously collecting the current values ​​of multiple traction return branches, resulting in deviations in statistical analysis. The existing technology is limited to basic data collection and data statistics for a single time period, and can only realize the basic collection of data such as traction return values ​​and the display of time-varying curves. It lacks detailed analysis and correlation analysis of multi-dimensional data, and cannot provide effective judgment and analysis basis for traction return anomalies. It makes it difficult for the operation and maintenance management department to predict and handle possible risks based on monitoring data, and it is difficult to fully guarantee personal and equipment safety during peak loads (such as when passing a train), posing a hidden danger to the long-term safe operation of the railway. Summary of the invention

[0006] The present invention aims to solve the above technical problems at least to a certain extent. The present invention provides a method, system, electronic equipment and product for abnormal monitoring of a traction power supply system.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for monitoring abnormality of a traction power supply system, comprising: Real-time collection of traction return branch current values ​​of each branch in the specified traction power supply system, and when the traction return branch current value of any branch reaches a preset trigger value, it is determined that the current state of the specified traction power supply system is a locomotive passing state, and then the specified performance parameter value of the grounding device of the specified traction power supply system is synchronously collected; Statistical analysis is performed on the traction return branch current values ​​of each branch during the locomotive passing state within the historical specified period to obtain the fluctuation range of the traction return branch current proportion of each branch, so as to monitor the abnormal traction return branch current value of each branch according to the fluctuation range of the traction return branch current proportion of each branch during the current locomotive passing state; Obtaining the specified performance parameter limit of the grounding device of the specified traction power supply system, and during the current locomotive passing state, performing abnormal monitoring on the specified performance parameter value of the grounding device according to the specified performance parameter limit of the grounding device, so as to provide real-time abnormal reminder when the specified performance parameter value of the grounding device is abnormal; A correlation analysis is performed on the traction return branch current values ​​and the specified performance parameter values ​​of the grounding device of each branch during the locomotive passing state within a historical specified period, and a specified performance parameter change trend function of the grounding device is obtained, so as to issue an abnormal warning for the grounding device state of the specified traction power supply system based on the specified performance parameter change trend function of the grounding device.

[0008] In one possible design, after determining that the current state of the designated traction power supply system is a locomotive passing state, the method further includes: The traction return branch current values ​​of each branch collected during the current locomotive passing state are summed up respectively to obtain the summed value of the first branch current of each branch in the designated traction power supply system during the current locomotive passing state; The sum of the first branch currents of all branches during the current locomotive passing state is summed to obtain a first summary current sum value; According to the summed value of the first branch currents of each branch in the designated traction power supply system during the current locomotive passing state and the summed value of the first aggregate current, a first traction return branch current proportion of each branch in the designated traction power supply system during the current locomotive passing state is obtained; The current proportion of the first traction return branch of each branch in the designated traction power supply system during the current locomotive passing state is visualized.

[0009] In a possible design, during the current locomotive passing state, the first j The sum of the currents in the first branch of the branches is: ; In the formula, j ∈{1,2,3,…, m}, m is the total number of branches in the designated traction power supply system; I i For the said j The branch line is in the current locomotive passing state. i The traction return branch current value collected for the first time; n For the said j The total number of times the traction return branch current value is collected during the current locomotive passing state; Correspondingly, the first summary current sum is: ; In the formula, Y j’ The first j’ The sum of the currents of the first branch of the branches, j’ ∈{1,2,3,…, m}; During the current locomotive passing state, the first j The current proportion of the first traction return branch of the branch is: .

[0010] In one possible design, after determining that the current state of the designated traction power supply system is a locomotive passing state, the method further includes: Acquire the traction return branch current value of each branch during the locomotive passing state collected within the specified analysis period, and sum the traction return branch current values ​​of each branch during the locomotive passing state collected within the specified analysis period to obtain the second branch current sum value of each branch within the specified analysis period; Summing the second branch current sum values ​​of each branch within the specified analysis period to obtain a second summary current sum value; According to the summed value of the second branch currents of each branch in the specified analysis period and the summed value of the second summary current, a proportion of the second traction return branch current of each branch in the specified analysis period is obtained; The proportion of the second traction return branch current of each branch within the specified analysis period is visualized.

[0011] In a possible design, the first j The sum of the second branch currents of the branches is: ; In the formula, j ∈{1,2,3,…, m}, m is the total number of branches in the designated traction power supply system; I i For the j The branch is the first one in the specified analysis period i The traction return branch current value collected for the first time, n’ For the j The total number of times the traction return branch current value is collected for each branch within the specified analysis period; Correspondingly, the second summary current sum is: ; In the formula, Y j’ The first j’ The sum of the second branch currents of the branches, j’ ∈{1,2,3,…, m}; The first j The current proportion of the first traction return branch of the branch is: .

[0012] In a possible design, the traction return branch current values ​​of each branch during the locomotive passing state in the historical specified period are statistically analyzed to obtain the fluctuation range of the traction return branch current proportion of each branch, including: Obtaining the proportion of sub-traction return branch current of each branch during the period of all locomotive passing states within the historical specified period; According to one or more sub-traction return branch current proportions among all sub-traction return branch current proportions of each branch, a traction return branch current proportion calibration value of each branch is obtained; from multiple sub-traction return branch current proportions of each branch, a minimum value of the sub-traction return branch current proportion and a maximum value of the sub-traction return branch current proportion of each branch are extracted; According to the calibrated value of the traction return branch current proportion of each branch, the minimum value of the sub-traction return branch current proportion and the maximum value of the sub-traction return branch current proportion, the fluctuation range of the traction return branch current proportion of each branch is obtained.

[0013] In a possible design, the fluctuation range of the traction return branch current ratio of any branch is: ;in, is the traction return branch current proportion calibration value of any branch, is the minimum value of the sub-traction return branch current proportion of any branch, It is the maximum value of the sub-traction return branch current proportion of any of the branches.

[0014] In a possible design, during the current locomotive passing state, the abnormal traction return branch current value of any branch is monitored according to the fluctuation range of the traction return branch current proportion of any branch, including: According to the traction return branch current value of any branch during the current locomotive passing state, obtaining the first traction return branch current proportion of any branch during the current locomotive passing state; Determine whether the current proportion of the first traction return branch of any of the branches is within the fluctuation range of the current proportion of the traction return branch corresponding to any of the branches. If so, determine that the current value of the traction return branch of any of the branches is in a normal state. If not, determine that the current value of the traction return branch of any of the branches is in an abnormal state.

[0015] In a possible design, the specified performance parameter values ​​of the grounding device include the ground potential of the specified traction power supply system, the step potential difference and the contact potential difference on the 27.5kV side; correspondingly, the specified performance parameter limits of the grounding device include the ground potential limit, the step potential difference limit and the contact potential difference limit; wherein the ground potential limit is: 2000V; the step potential difference limit is: ; In the formula, The resistivity of the soil on the surface of the ground in the area where the grounding device of the designated traction power supply system is located; is the preset surface attenuation coefficient; is the preset earth fault current duration; The contact potential difference limit is: .

[0016] In a possible design, the correlation analysis is performed on the traction return branch current value and the specified performance parameter value of the grounding device of each branch during the locomotive passing state in the historical specified period, and the change trend function of the specified performance parameter of the grounding device is obtained, including: Obtaining the specified performance parameter value of the grounding device during the locomotive passing state in the specified historical period, and obtaining the third summary current sum value during the locomotive passing state in the specified historical period according to the traction return branch current of each branch during the locomotive passing state in the specified historical period; The sum of the third aggregate current during all locomotive passing states within the historical specified period is taken as the independent variable, and the specified performance parameter value of the grounding device during all locomotive passing states within the historical specified period is taken as the dependent variable, and a first-order function fitting is performed to obtain a trend function of the specified performance parameter change of the grounding device.

[0017] In a second aspect, the present invention provides a traction power supply system abnormality monitoring device, which is used to implement a traction power supply system abnormality monitoring method as described in any one of the above; the traction power supply system abnormality monitoring device comprises: A data acquisition module is used to collect the traction return branch current value of each branch in the specified traction power supply system in real time, and when the traction return branch current value of any branch reaches a preset trigger value, determine that the current state of the specified traction power supply system is a locomotive passing state, and then synchronously collect the specified performance parameter value of the grounding device of the specified traction power supply system; The traction return device abnormality monitoring module is in communication connection with the data acquisition module, and is used to perform statistical analysis on the traction return branch current values ​​of each branch during the locomotive passing state within a specified historical period, and obtain the fluctuation range of the traction return branch current proportion of each branch, so as to perform traction return branch current value abnormality monitoring on each branch according to the fluctuation range of the traction return branch current proportion of each branch during the current locomotive passing state; A grounding device real-time abnormality monitoring module is connected to the data acquisition module for obtaining the specified performance parameter limit of the grounding device of the specified traction power supply system, and during the current locomotive passing state, performs abnormality monitoring on the specified performance parameter value of the grounding device according to the specified performance parameter limit of the grounding device, so as to provide a real-time abnormality reminder when the specified performance parameter value of the grounding device is abnormal; The grounding device abnormality prediction module is communicatively connected to the data acquisition module, and is used to perform correlation analysis on the traction return branch current values ​​of each branch during the locomotive passing state and the specified performance parameter values ​​of the grounding device within a historical specified period, and obtain a change trend function of the specified performance parameters of the grounding device, so as to issue an abnormal warning for the grounding device state of the specified traction power supply system based on the change trend function of the specified performance parameters of the grounding device.

[0018] In a third aspect, the present invention provides an electronic device, comprising: a memory for storing computer program instructions; and, A processor is used to execute the computer program instructions to complete the operation of a traction power supply system abnormality monitoring method as described in any one of the above.

[0019] In a fourth aspect, the present invention provides a computer program product, comprising a computer program or instructions, which, when executed by a computer, implements a method for monitoring abnormalities in a traction power supply system as described in any one of the above.

[0020] The beneficial effects of the present invention are: The present invention discloses a method, system, electronic equipment and product for monitoring abnormalities in a traction power supply system, which can realize in-depth analysis and abnormality detection of data collected in the traction power supply system, and is conducive to ensuring the safe and stable operation of electrified railways. Specifically, after collecting data, the present invention further obtains the fluctuation range of the proportion of the traction return branch current of each branch according to the collected data, so as to monitor the abnormal current value of the traction return branch of each branch, and can also perform real-time abnormal monitoring and abnormal warning of the specified performance parameter value of the grounding device, realizing the detailed analysis and correlation analysis of multi-dimensional data, and can provide data support for the design or modification of the traction return device and the grounding device for the operation and maintenance management department of the electrified railway, which is conducive to ensuring the long-term safe and stable operation of the electrified railway.

[0021] Other beneficial effects of the present invention will be further described in the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the existing traction return schematic diagram; Figure 2is a flow chart of the method for monitoring abnormality of the traction power supply system in Example 1; Figure 3 It is a visualized schematic diagram of the current proportion of the first traction return branch of each branch of a traction power supply system in the example of embodiment 1 during a locomotive passing state; Figure 4 It is a schematic diagram of the combination of scatter points and correlation analysis curves illustrated in Example 1. DETAILED DESCRIPTION

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0024] Embodiment 1: This embodiment discloses a method for monitoring abnormalities in a traction power supply system, which can be executed by, but is not limited to, a computer device or a virtual machine with certain computing resources, such as a personal computer, a smart phone, a personal digital assistant, or a wearable device, or by a virtual machine.

[0025] like Figure 2 As shown, a method for monitoring abnormality of a traction power supply system may include but is not limited to the following steps: S1. Real-time collection of the traction return branch current value of each branch in the designated traction power supply system, and when the traction return branch current value of any branch reaches a preset trigger value, the current state of the designated traction power supply system is determined to be a locomotive passing state, and then the designated performance parameter value of the grounding device of the designated traction power supply system is synchronously collected to obtain the collected data during the current locomotive passing state; it should be understood that in this embodiment, the branch in the designated traction power supply system can also be referred to as a traction return branch, which is abbreviated as "branch" in the text. It should be noted that in this embodiment, when the traction return branch current value of any branch reaches a preset trigger value, it is regarded as a locomotive entering the station, and when the return values ​​of all branches drop below the trigger value, it is regarded as a locomotive leaving the station. Based on this, the time period of each passing event can be accurately defined, so as to obtain the collected data during each locomotive passing state.

[0026] It should be noted that, in this embodiment, in order to eliminate the interference caused by stray current in the traction power supply system, it is necessary to screen effective data for statistical analysis, and only collect data under specific conditions, that is, preset a trigger value, and when the current value of the traction return branch of any branch reaches the preset trigger value, it is determined that the current state of the specified traction power supply system is a locomotive passing state, and then the specified performance parameter value of the grounding device is synchronously collected, and the collected data of the traction return branch current value when the locomotive is not passing is screened. In this embodiment, different types of traction power supply systems are set with different trigger values. Specifically, when the traction power supply system is a substation, an AT station (when the traction network adopts the AT power supply mode, an autotransformer AT is set every 10km along the railway, and the setting place is called an AT station) and a switch station, the trigger value is set to: 5~50A, and when the traction power supply system is a traction substation, the trigger value is set to: 10~100A.

[0027] In step S1, after determining that the current state of the designated traction power supply system is a locomotive passing state, the method further includes: A1. The traction return branch current values ​​of each branch collected during the current locomotive passing state are summed up respectively to obtain the summed value of the first branch current of each branch in the designated traction power supply system during the current locomotive passing state.

[0028] Specifically, in step A1, during the current locomotive passing state, the first j The sum of the currents in the first branch of the branches is: ; In the formula, j ∈{1,2,3,…, m}, m is the total number of branches in the designated traction power supply system; I i For the said j The branch line is in the current locomotive passing state. i The traction return branch current value collected for the first time; n For the said j The total number of times the traction return branch current value is collected during the current locomotive passing state; it should be understood that n The value is determined according to the preset acquisition frequency. Since the train passing time is very short, in order to ensure the integrity of the data acquisition such as the traction return branch current value, in this embodiment, the acquisition frequency of the traction return branch current value is set to 1Hz~50Hz. jAfter the traction return branch current value of a branch reaches a preset trigger value, the acquisition frequency of the specified performance parameter value of the grounding device is consistent with the acquisition frequency of the traction return branch current value, which is also 1Hz~50Hz.

[0029] A2. Sum the first branch current sum values ​​of all branches during the current locomotive passing state to obtain a first aggregate current sum value; it should be noted that, in this embodiment, the first aggregate current sum value is also the aggregate current value of all branches flowing into the transformer in the traction power supply system during the current locomotive passing state.

[0030] Specifically, in step A2, the first summary current sum is: ; In the formula, Y j’ The first j’ The sum of the currents of the first branch of the branches, j’ ∈{1,2,3,…, m}.

[0031] A3. According to the sum of the first branch currents of each branch in the designated traction power supply system during the current locomotive passing state and the first aggregate current sum, the first traction return branch current proportion of each branch in the designated traction power supply system during the current locomotive passing state is obtained.

[0032] Specifically, in step A3, during the current locomotive passing state, the first j The current proportion of the first traction return branch of the branch is: .

[0033] A4. Visually display the current proportion of the first traction return branch of each branch in the specified traction power supply system during the current locomotive passing state. It should be noted that the current proportion of the first traction return branch of each branch during the current locomotive passing state can be displayed in the form of, but not limited to, graphs, curves and / or tables, so as to intuitively understand the current distribution of each branch. To improve the intuitiveness of the display, in this embodiment, a pie chart is used for display. Figure 3 A visual diagram of the current proportion of the first traction return branch of each branch of a traction power supply system during a locomotive passing state is given.

[0034] It should be noted that, based on the above steps A1 to A4, this embodiment can realize the analysis and monitoring of the proportion of the traction return branch current of each branch in the designated traction power supply system during the current locomotive passing state.

[0035] In step S1, after determining that the current state of the designated traction power supply system is a locomotive passing state, the method further includes: B1. Obtain the traction return branch current value of each branch during the locomotive passing state collected within the specified analysis period, and sum the traction return branch current values ​​of each branch during the locomotive passing state collected within the specified analysis period, respectively, to obtain the second branch current sum value of each branch within the specified analysis period. As an example, if the duration of the specified analysis period is 24h~720h, it is not limited here. It should be noted that in this embodiment, the specified analysis period can be a certain period in history, or it can be a certain period from the current moment to the future, which is also not limited here.

[0036] Specifically, in step B1, the first j The sum of the second branch currents of the branches is: ; In the formula, j ∈{1,2,3,…, m}, m is the total number of branches in the designated traction power supply system; I i For the said j The branch is the first one in the specified analysis period i The traction return branch current value collected for the first time, n’ For the said j The total number of times the traction return branch current value is collected for each branch within the specified analysis period.

[0037] B2. Sum the second branch current sum values ​​of each branch within the specified analysis period to obtain a second aggregate current sum value; it should be noted that, in this embodiment, the first aggregate current sum value is also the aggregate current value of all branches flowing into the transformer in the traction power supply system within the specified analysis period.

[0038] Specifically, in step B2, the second summary current sum is: ; In the formula, Y j’ The first j’ The sum of the second branch currents of the branches, j’ ∈{1,2,3,…, m}.

[0039] B3. Obtain the second traction return branch current proportion of each branch in the specified analysis period according to the sum of the second branch currents of each branch in the specified analysis period and the sum of the second aggregate current.

[0040] Specifically, in step B3, the first j The current proportion of the first traction return branch of the branch is: .

[0041] B4. Visually display the proportion of the second traction return branch current of each branch in the specified analysis period. Based on this, this embodiment can realize the monitoring of the traction return current in the specified period.

[0042] It should be noted that, based on the above steps B1 to B4, this embodiment can realize the analysis and monitoring of the proportion of the traction return branch current of each branch in the specified traction power supply system within the specified analysis period.

[0043] S2. Statistically analyze the traction return branch current values ​​of each branch during the locomotive passing state within the historical specified period to obtain the fluctuation range of the traction return branch current proportion of each branch, so as to monitor the abnormal traction return branch current value of each branch according to the fluctuation range of the traction return branch current proportion of each branch during the current locomotive passing state; wherein, any locomotive passing state period is the period from the initial moment when the specified traction power supply system is in the locomotive passing state to the moment when the return current values ​​of all branches drop below the trigger value (that is, not in the locomotive passing state).

[0044] In step S2 of this embodiment, the traction return branch current values ​​of each branch during the locomotive passing state within the historical specified period are statistically analyzed to obtain the fluctuation range of the traction return branch current proportion of each branch, including: S201. respectively obtain the proportion of sub-traction return branch current of each branch during the period of all locomotive passing states within the specified historical period; S202. Obtain a calibrated value of the traction return branch current ratio of each branch based on one or more sub-traction return branch current ratios among all sub-traction return branch current ratios of each branch; it should be noted that, in the present embodiment, the sub-traction return branch current ratio during the locomotive passing state corresponding to at least one locomotive normal operation period among all sub-traction return branch current ratios of each branch can be selected, and the calibrated value of the traction return branch current ratio of each branch can be obtained based on it; specifically, when one sub-traction return branch current ratio is selected for a certain branch, the sub-traction return branch current ratio is used as the calibrated value of the traction return branch current ratio of the corresponding branch; when multiple sub-traction return branch current ratios are selected for a certain branch, the average value of the multiple sub-traction return branch current ratios is used as the calibrated value of the traction return branch current ratio of the corresponding branch.

[0045] S203. Extract the minimum value of the sub-traction return branch current proportion and the maximum value of the sub-traction return branch current proportion of each branch from the current proportions of multiple sub-traction return branches of each branch; it should be understood that, in this embodiment, the maximum value of the sub-traction return branch current proportion of any branch is the minimum value of the multiple sub-traction return branch current proportions of any branch, and the minimum value of the sub-traction return branch current proportion is the maximum value of the multiple sub-traction return branch current proportions of any branch.

[0046] S204. Obtain the fluctuation range of the traction return branch current proportion of each branch according to the calibrated value of the traction return branch current proportion of each branch, the minimum value of the sub-traction return branch current proportion and the maximum value of the sub-traction return branch current proportion.

[0047] Specifically, in step S204, the fluctuation range of the traction return branch current ratio of any branch is: ;in, is the traction return branch current proportion calibration value of any branch, is the minimum value of the sub-traction return branch current proportion of any branch, It is the maximum value of the sub-traction return branch current proportion of any of the branches.

[0048] Further, in step S2, during the current locomotive passing state, the traction return branch current value abnormality monitoring is performed on any branch according to the fluctuation range of the traction return branch current proportion of any branch, including: S205. According to the traction return branch current value of any branch during the current locomotive passing state, obtain the first traction return branch current proportion of any branch during the current locomotive passing state; specifically, in this embodiment, the first traction return branch current proportion of any branch during the current locomotive passing state can be obtained according to the above steps A1 to A4, which will not be repeated here.

[0049] S206. Determine whether the current proportion of the first traction return branch of any of the branches is within the fluctuation range of the current proportion of the traction return branch corresponding to any of the branches. If so, determine that the current value of the traction return branch of any of the branches is in a normal state. If not, determine that the current value of the traction return branch of any of the branches is in an abnormal state.

[0050] Specifically, in the present embodiment, when the abnormal traction return branch current value of any branch is monitored according to the fluctuation range of the traction return branch current ratio of any branch during the current locomotive passing state, the traction return branch current ratio of any branch during the current locomotive passing state is obtained in advance, and then it is determined whether the data is within the fluctuation range of the traction return branch current ratio of any branch. If so, it is determined that the traction return branch current value of any branch is in a normal state. If not, it is determined that the traction return branch current value of any branch is in an abnormal state, and this abnormal detection result is used as a guiding basis for whether any branch needs to be repaired.

[0051] S3. Obtain the specified performance parameter limit of the grounding device of the specified traction power supply system, and during the current locomotive passing state, perform abnormal monitoring on the specified performance parameter value of the grounding device according to the specified performance parameter limit of the grounding device, so as to provide real-time abnormal reminder when the specified performance parameter value of the grounding device is abnormal.

[0052] In step S1 of this embodiment, the specified performance parameter values ​​of the grounding device include the ground potential of the specified traction power supply system, the step potential difference and the contact potential difference on the 27.5kV side; correspondingly, in step S3, the specified performance parameter limits of the grounding device include the ground potential limit, the step potential difference limit and the contact potential difference limit; wherein the ground potential limit is: 2000V, which can be obtained according to the current standard (GB / T 50065-2011 "Grounding Design Specifications for AC Electrical Installations"); the step potential difference limit is: ; In the formula, is the soil resistivity of the surface layer in the area where the grounding device of the designated traction power supply system is located, in Ω.m; is the preset surface attenuation coefficient; is the preset earth fault current duration, in seconds; The contact potential difference limit is: .

[0053] Specifically, in step S3 of this embodiment, the specified performance parameter value of the grounding device is monitored for abnormality according to the specified performance parameter limit value of the grounding device, so as to provide a real-time abnormal reminder when the specified performance parameter value of the grounding device is abnormal, that is, the specified performance parameter value of the grounding device collected in real time is compared with the corresponding specified performance parameter limit value of the grounding device. If the specified performance parameter value of the grounding device collected in real time is less than the corresponding specified performance parameter limit value of the grounding device, the specified performance parameter value of the grounding device is determined to be normal, otherwise it is determined to be abnormal. This setting makes it easy for management personnel to know whether the grounding device is abnormal in time, and to perform maintenance operations on the grounding device when it is abnormal.

[0054] S4. Perform correlation analysis on the traction return branch current values ​​and the specified performance parameter values ​​of the grounding device of each branch during the locomotive passing state within the historical specified period, and obtain the specified performance parameter change trend function of the grounding device, so as to issue an abnormal warning for the grounding device state of the specified traction power supply system based on the specified performance parameter change trend function of the grounding device.

[0055] In step S4, the correlation analysis is performed on the traction return branch current value of each branch during the locomotive passing state and the specified performance parameter value of the grounding device in the historical specified period to obtain the change trend function of the specified performance parameter of the grounding device, including: S401. Obtain the specified performance parameter value of the grounding device during the locomotive passing state in the specified historical period, and obtain the third summary current sum value during the locomotive passing state in the specified historical period according to the traction return branch current of each branch during the locomotive passing state in the specified historical period; S402. Take the third aggregate current summed value during all locomotive passing states within the historical specified period as the independent variable, take the specified performance parameter value of the grounding device during all locomotive passing states within the historical specified period as the dependent variable, perform first-order function fitting, and obtain the specified performance parameter change trend function of the grounding device. Specifically, in this embodiment, by establishing a rectangular coordinate system, the horizontal axis uses the third aggregate current summed value during all locomotive passing states within the historical specified period as the digital calibration, and the vertical axis uses the specified performance parameter value of the grounding device during all locomotive passing states within the historical specified period as the digital calibration. The specified performance parameter value of the grounding device takes the ground potential as an example, and can be obtained as follows: Figure 4Based on the scatter plot in the schematic diagram of the combination of scatter plots and correlation analysis curves shown in FIG, a trend function of the specified performance parameters of the grounding device can be fitted, and the correlation analysis curve corresponding to the function is shown in FIG. Figure 4 It should be noted that the change trend function of the specified performance parameter of the grounding device can reflect the trend of the specified performance parameter of the grounding device changing with the third summary current summation value, which can be expressed as: , x Refers to the independent variable.

[0056] Specifically, in step S4 of the present embodiment, the changing trend of the specified performance parameters of the grounding device of the specified traction power supply system along with the summed current value in the corresponding period can be obtained according to the changing trend function of the specified performance parameters of the grounding device. Based on this, an abnormal warning of the state of the grounding device of the specified traction power supply system can be realized. For example, it can be known that when the summed current value reaches a certain value, the specified performance parameters of the grounding device of the specified traction power supply system will be abnormally exceeded, and the abnormal warning information of the grounding device can be sent to the management personnel of the specified traction power supply system in advance, so that the management personnel can judge whether the grounding device needs to be repaired according to the locomotive passing situation of the specified traction power supply system. For example, if the management personnel know that the number of locomotives passing at the same time or the capacity will increase in a certain period in the future and the corresponding summed current value will reach the certain value according to the locomotive passing situation of the specified traction power supply system, it is determined that the grounding device needs to be repaired in advance before a certain period, such as structural design or modification of the grounding device, so as to ensure the safety and reliability of the grounding system.

[0057] This embodiment can realize in-depth analysis and anomaly detection of the data collected in the traction power supply system, which is beneficial to ensure the safe and stable operation of the electrified railway. Specifically, during the implementation of this embodiment, first, the traction return branch current value of each branch in the designated traction power supply system is collected in real time, and when the traction return branch current value of any branch reaches a preset trigger value, it is determined that the current state of the designated traction power supply system is a locomotive passing state, and then the designated performance parameter value of the grounding device of the designated traction power supply system is collected synchronously; then, the traction return branch current value of each branch during the locomotive passing state in the historical specified period is statistically analyzed to obtain the fluctuation range of the traction return branch current proportion of each branch, so as to conduct traction return branch current analysis on each branch according to the fluctuation range of the traction return branch current proportion of each branch during the current locomotive passing state. Abnormal current value monitoring; then, obtaining the specified performance parameter limit of the grounding device of the specified traction power supply system, and during the current locomotive passing state, performing abnormal monitoring on the specified performance parameter value of the grounding device according to the specified performance parameter limit of the grounding device, so as to provide real-time abnormal reminder when the specified performance parameter value of the grounding device is abnormal; finally, by performing correlation analysis on the traction return branch current value and the specified performance parameter value of the grounding device of each branch during the locomotive passing state within the historical specified period, a trend function of the specified performance parameter change of the grounding device is obtained, so as to provide abnormal warning for the grounding device state of the specified traction power supply system based on the specified performance parameter change trend function of the grounding device. In this process, after collecting data, this embodiment further obtains the fluctuation range of the traction return branch current proportion of each branch based on the collected data, so as to monitor the abnormal current value of the traction return branch of each branch, and can also perform real-time abnormal monitoring and abnormal warning on the specified performance parameter values ​​of the grounding device, thereby realizing the detailed analysis and correlation analysis of multi-dimensional data, and providing data support for the design or modification of traction return devices and grounding devices for the operation and maintenance management departments of electrified railways, which is conducive to ensuring the long-term safe and stable operation of electrified railways.

[0058] Embodiment 2: This embodiment discloses a traction power supply system abnormality monitoring device, which is used to implement the traction power supply system abnormality monitoring method in embodiment 1; the traction power supply system abnormality monitoring device includes: A data acquisition module is used to collect the traction return branch current value of each branch in the specified traction power supply system in real time, and when the traction return branch current value of any branch reaches a preset trigger value, determine that the current state of the specified traction power supply system is a locomotive passing state, and then synchronously collect the specified performance parameter value of the grounding device of the specified traction power supply system; The traction return device abnormality monitoring module is in communication connection with the data acquisition module, and is used to perform statistical analysis on the traction return branch current values ​​of each branch during the locomotive passing state within a specified historical period, and obtain the fluctuation range of the traction return branch current proportion of each branch, so as to perform traction return branch current value abnormality monitoring on each branch according to the fluctuation range of the traction return branch current proportion of each branch during the current locomotive passing state; A grounding device real-time abnormality monitoring module is connected to the data acquisition module for obtaining the specified performance parameter limit of the grounding device of the specified traction power supply system, and during the current locomotive passing state, performs abnormality monitoring on the specified performance parameter value of the grounding device according to the specified performance parameter limit of the grounding device, so as to provide a real-time abnormality reminder when the specified performance parameter value of the grounding device is abnormal; The grounding device abnormality prediction module is communicatively connected to the data acquisition module, and is used to perform correlation analysis on the traction return branch current values ​​of each branch during the locomotive passing state and the specified performance parameter values ​​of the grounding device within a historical specified period, and obtain a change trend function of the specified performance parameters of the grounding device, so as to issue an abnormal warning for the grounding device state of the specified traction power supply system based on the change trend function of the specified performance parameters of the grounding device.

[0059] It should be noted that the working process, working details and technical effects of the traction power supply system abnormality monitoring device provided in this embodiment 2 can be found in embodiment 1 and will not be repeated here.

[0060] Embodiment 3: Based on Embodiment 1 or 2, this embodiment discloses an electronic device, which may be a smart phone, a tablet computer, a laptop computer, or a desktop computer, etc. The electronic device may be called a user terminal, a portable terminal, a desktop terminal, etc. The electronic device includes: a memory for storing computer program instructions; and, A processor is used to execute the computer program instructions to complete the operation of a traction power supply system abnormality monitoring method as described in any one of Example 1.

[0061] Embodiment 4: Based on any one of embodiments 1 to 3, this embodiment discloses a computer program product, including a computer program or an instruction, which, when executed by a computer, implements a traction power supply system abnormality monitoring method as described in any one of embodiment 1. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.

[0062] Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, and optionally, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for monitoring abnormality of a traction power supply system, characterized in that: include: Real-time collection of traction return branch current values ​​of each branch in the specified traction power supply system, and when the traction return branch current value of any branch reaches a preset trigger value, it is determined that the current state of the specified traction power supply system is a locomotive passing state, and then the specified performance parameter value of the grounding device of the specified traction power supply system is synchronously collected; Statistical analysis is performed on the traction return branch current values ​​of each branch during the locomotive passing state within the historical specified period to obtain the fluctuation range of the traction return branch current proportion of each branch, so as to monitor the abnormal traction return branch current value of each branch according to the fluctuation range of the traction return branch current proportion of each branch during the current locomotive passing state; Obtaining the specified performance parameter limit of the grounding device of the specified traction power supply system, and during the current locomotive passing state, performing abnormal monitoring on the specified performance parameter value of the grounding device according to the specified performance parameter limit of the grounding device, so as to provide real-time abnormal reminder when the specified performance parameter value of the grounding device is abnormal; A correlation analysis is performed on the traction return branch current values ​​and the specified performance parameter values ​​of the grounding device of each branch during the locomotive passing state within a historical specified period, and a specified performance parameter change trend function of the grounding device is obtained, so as to issue an abnormal warning for the grounding device state of the specified traction power supply system based on the specified performance parameter change trend function of the grounding device.

2. The method for monitoring abnormality of a traction power supply system according to claim 1, characterized in that: After determining that the current state of the designated traction power supply system is a locomotive passing state, the method further includes: The traction return branch current values ​​of each branch collected during the current locomotive passing state are summed up respectively to obtain the summed value of the first branch current of each branch in the designated traction power supply system during the current locomotive passing state; The sum of the first branch currents of all branches during the current locomotive passing state is summed to obtain a first summary current sum value; According to the summed value of the first branch currents of each branch in the designated traction power supply system during the current locomotive passing state and the summed value of the first aggregate current, a first traction return branch current proportion of each branch in the designated traction power supply system during the current locomotive passing state is obtained; The current proportion of the first traction return branch of each branch in the designated traction power supply system during the current locomotive passing state is visualized.

3. The method for monitoring abnormality of a traction power supply system according to claim 2, characterized in that: The first j The sum of the currents in the first branch of the branches is: ； In the formula, j ∈{1,2,3,…, m }, m is the total number of branches in the designated traction power supply system; I i For the j The branch line is in the current locomotive passing state. i The traction return branch current value collected for the first time; n For the j The total number of times the traction return branch current value is collected during the current locomotive passing state; Correspondingly, the first summary current sum is: ； In the formula, Y j’ The first j’ The sum of the currents of the first branch of the branches, j’ ∈{1,2,3,…, m }; During the current locomotive passing state, the first j The current proportion of the first traction return branch of the branch is: 。 4. The method for monitoring abnormality of a traction power supply system according to claim 1, characterized in that: After determining that the current state of the designated traction power supply system is a locomotive passing state, the method further includes: Acquire the traction return branch current value of each branch during the locomotive passing state collected within the specified analysis period, and sum the traction return branch current values ​​of each branch during the locomotive passing state collected within the specified analysis period to obtain the second branch current sum value of each branch within the specified analysis period; Summing the second branch current sum values ​​of each branch within the specified analysis period to obtain a second summary current sum value; According to the summed value of the second branch currents of each branch in the specified analysis period and the summed value of the second summary current, a proportion of the second traction return branch current of each branch in the specified analysis period is obtained; The proportion of the second traction return branch current of each branch within the specified analysis period is visualized.

5. The method for monitoring abnormality of a traction power supply system according to claim 4, characterized in that: The first j The sum of the second branch currents of the branches is: ； In the formula, j ∈{1,2,3,…, m }, m is the total number of branches in the designated traction power supply system; I i For the j The branch is the first one in the specified analysis period i The traction return branch current value collected for the first time, n’ For the j The total number of times the traction return branch current value is collected for each branch within the specified analysis period; Correspondingly, the second summary current sum is: ； In the formula, Y j’ The first j’ The sum of the second branch currents of the branches, j’ ∈{1,2,3,…, m }; The first j The current proportion of the first traction return branch of the branch is: 。 6. The method for monitoring abnormality of a traction power supply system according to claim 1, characterized in that: The traction return branch current values ​​of each branch during the locomotive passing state in the historical specified period are statistically analyzed to obtain the fluctuation range of the traction return branch current proportion of each branch, including: Obtaining the proportion of sub-traction return branch current of each branch during the period of all locomotive passing states within the historical specified period; According to one or more sub-traction return branch current proportions among all sub-traction return branch current proportions of each branch, a traction return branch current proportion calibration value of each branch is obtained; from multiple sub-traction return branch current proportions of each branch, a minimum value of the sub-traction return branch current proportion and a maximum value of the sub-traction return branch current proportion of each branch are extracted; According to the calibrated value of the traction return branch current proportion of each branch, the minimum value of the sub-traction return branch current proportion and the maximum value of the sub-traction return branch current proportion, the fluctuation range of the traction return branch current proportion of each branch is obtained.

7. A method for monitoring abnormality of a traction power supply system according to claim 6, characterized in that: The fluctuation range of the traction return branch current ratio of any branch is: ;in, is the traction return branch current proportion calibration value of any branch, is the minimum value of the sub-traction return branch current proportion of any branch, It is the maximum value of the sub-traction return branch current proportion of any of the branches.

8. The method for monitoring abnormality of a traction power supply system according to claim 1, characterized in that: During the current locomotive passing state, the traction return branch current value abnormality monitoring is performed on any branch according to the fluctuation range of the traction return branch current proportion of any branch, including: According to the traction return branch current value of any branch during the current locomotive passing state, obtaining the first traction return branch current proportion of any branch during the current locomotive passing state; Determine whether the current proportion of the first traction return branch of any of the branches is within the fluctuation range of the current proportion of the traction return branch corresponding to any of the branches. If so, determine that the current value of the traction return branch of any of the branches is in a normal state. If not, determine that the current value of the traction return branch of any of the branches is in an abnormal state.

9. The method for monitoring abnormality of a traction power supply system according to claim 1, characterized in that: The specified performance parameter values ​​of the grounding device include the ground potential of the specified traction power supply system, the step potential difference and the contact potential difference on the 27.5kV side; correspondingly, the specified performance parameter limits of the grounding device include the ground potential limit, the step potential difference limit and the contact potential difference limit; wherein the ground potential limit is: 2000V; the step potential difference limit is: ； In the formula, The resistivity of the soil on the surface of the ground in the area where the grounding device of the designated traction power supply system is located; is the preset surface attenuation coefficient; is the preset earth fault current duration; The contact potential difference limit is: 。 10. The method for monitoring abnormality of a traction power supply system according to claim 1, characterized in that: The correlation analysis is performed on the traction return branch current value and the specified performance parameter value of the grounding device of each branch during the locomotive passing state in the historical specified period, and the change trend function of the specified performance parameter of the grounding device is obtained, including: Obtaining the specified performance parameter value of the grounding device during the locomotive passing state in the specified historical period, and obtaining the third summary current sum value during the locomotive passing state in the specified historical period according to the traction return branch current of each branch during the locomotive passing state in the specified historical period; The sum of the third aggregate current during all locomotive passing states within the historical specified period is taken as the independent variable, and the specified performance parameter value of the grounding device during all locomotive passing states within the historical specified period is taken as the dependent variable, and a first-order function fitting is performed to obtain a trend function of the specified performance parameter change of the grounding device.

Images