CN117477769A - Early warning method and system for electric power system - Google Patents
Early warning method and system for electric power system Download PDFInfo
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Abstract
The invention relates to the technical field of early warning of power systems, and particularly discloses an early warning method and system of a power system, wherein the method comprises the following steps: the invention monitors the environment interference condition and the power quality condition of the power transmission line, screens the abnormal operation and maintenance line, realizes the accurate positioning of the fault position, is favorable for shortening the fault response time, thereby reducing the influence of the fault on the normal operation of the system, simultaneously, can take repair measures more rapidly through quick positioning of the fault, reduces the power failure time, improves the reliability of the power system, and monitors and timely early warns the early warning system of the power system in real time by monitoring the abnormal condition of the power equipment and the sub-combination link of the abnormal operation and maintenance line, is favorable for improving the safety and stability of the power system and reducing the maintenance cost of the fault of the power system.
Description
Technical Field
The invention relates to the technical field of early warning of power systems, in particular to an early warning method and system of a power system.
Background
The power system is one of the indispensable infrastructures of modern society, provides power for families, enterprises, medical institutions, industrial facilities and the like, supports the normal operation of economy and life, and the power system early warning method is a technology and strategy for monitoring, identifying and predicting the problems of the power system.
For example, bulletin numbers: the invention patent of CN106033890B discloses a space early warning method for critical phase change of a power system, which utilizes space autocorrelation and space variance indexes of line load rate of the power system to capture imbalance of power flow distribution and distribution pattern of transmission capacity, and uses the space autocorrelation and space variance trend line change of the line load rate to reach a system early warning threshold as an early warning signal to early warn the power system to enter a critical state.
For example, bulletin numbers: the invention patent of CN102707178B discloses a fault early warning monitoring method of secondary equipment of an electric power system, which is based on real-time acquisition of power consumption data information of the secondary equipment and data acquisition sharing of a data communication network, and gives out prediction and judgment of alarm fault states of the secondary equipment through local and main station system logic, and the result can be provided for scheduling personnel, protection personnel and maintenance personnel as the basis of next operation and maintenance.
However, there are also some disadvantages in early warning of the power system, which are embodied in the following aspects: (1) The current monitoring on the aspect of the power transmission line of the early warning of the power system is not comprehensive enough, the power transmission line is one of the core components of the power system and is more easily influenced by weather and environmental factors, for example, wind speed and corrosive substances can accelerate the aging and damage of the power transmission line, the monitoring on the aspect of the power transmission line is not comprehensive enough, potential problems or faults can not be found in time, the effectiveness of the early warning system is influenced, and the reliability of the power system is further reduced.
(2) At present, fault judgment is mainly carried out through monitoring electrical parameters of all equipment in the power system for early warning of the power system, efficiency is low, accurate positioning cannot be carried out, when faults occur, a maintenance team may need more time to search for a fault source, further delay of fault processing is caused, downtime of the power system is increased, reliability of the power system is affected, waste of a large amount of resources is caused, and maintenance cost of the faults is improved.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a power system early warning method and a system thereof, which can effectively solve the problems related to the background art.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the first aspect of the invention provides an early warning method for a power system, comprising the following steps: analyzing the abnormal condition of each target power transmission line, comprehensively calculating the abnormal evaluation index of each target power transmission line, and screening each abnormal operation and maintenance line.
Analyzing the abnormal conditions of the power equipment of the Chang Yunwei lines, and comprehensively calculating the abnormality evaluation indexes of the power equipment of the abnormal operation and maintenance lines.
And thirdly, equally dividing each abnormal operation and maintenance line, detecting and inspecting each sub-combination link of each different Chang Yunwei line, and calculating the abnormal situation value of each sub-combination link of each abnormal operation and maintenance line.
And fourthly, positioning and early warning are sequentially carried out on the power equipment and the sub-combination links of the abnormal operation and maintenance line through data integration processing.
As a further method, the analysis of the abnormal condition of each target transmission line is performed, and the specific analysis process is as follows: monitoring the working environment of each target power transmission line to obtain the wind direction, wind power grade and air density rho of the working environment of each target power transmission line i And the integrated wind speed V i The length of each target power transmission line is obtained from the power system information base, and the body surface area of each target power transmission line is obtained as the exposed surface area A of each target power transmission line i Meanwhile, according to the wind direction and the wind power grade of the working environment of each target power transmission line, the resistance coefficient Cd of each target power transmission line is obtained by matching from the power system information base i Comprehensively calculating wind load F of each target transmission line i The calculation expression is as follows:where i is denoted as the number of each target transmission line, i=1, 2,3,n, n represents the total number of target lines.
The corrosiveness of the working environment of each target power transmission line is monitored by arranging a plurality of monitoring points, and the humidity W of each monitoring point of the working environment of each target power transmission line is obtained ij Sulfide concentration S ij And chloride concentration Cl ij Meanwhile, the proper working humidity range of the target line is obtained from the power system information base, and the intermediate value of the range is extracted as the reference standard working humidity of the target line and is marked as W 0 Comprehensively calculating corrosion risk degree evaluation indexes of working environments of all target power transmission linesWherein DeltaW is expressed as the set reference allowable deviation humidity, S 0 And Cl 0 The critical sulfide concentration and critical chloride concentration, ζ, are respectively expressed as the set target line working environment 1 、ζ 2 And zeta 3 The corrosion risk influence factors are respectively expressed as set humidity, sulfide concentration and chloride concentration, j is expressed as the number of each monitoring point, j=1, 2, 3.
Obtaining the maximum bearing wind load F of the target line from the power system information base 0 Comprehensively calculating the environmental interference value alpha of each target transmission line i The calculation expression is as follows:wherein psi is 1 Sum phi 2 Expressed as interference weight factors corresponding to the set wind load and corrosion risk level, respectively.
And monitoring the working parameters of each target power transmission line, and calculating the power quality evaluation index of each target power transmission line.
As a further method, the power quality evaluation index of each target transmission line is calculated, and the specific analysis and calculation process is as follows: monitoring working parameters of each target power transmission line with a set monitoring period, and dividing monitoring time points with a set time interval to obtain the situation that each target power transmission line is inGround resistance R at each monitoring time point iq Monitoring the number of voltage sags N in a cycle i According to the numerical expressionCalculating the average grounding resistance of each target transmission line>Where q is denoted as the number of each monitoring time point, q=1, 2,3,..k, k is denoted as the total number of monitoring time points.
Comprehensively calculating power quality evaluation index beta of each target power transmission line i The calculation expression is as follows:wherein R is 0 And N 0 Respectively expressed as the maximum allowable ground resistance of the power transmission line and the maximum allowable voltage dip number of the power transmission line, and xi 1 And xi 2 The power quality influence factors are respectively expressed as the set grounding resistance and the corresponding voltage sag times.
As a further method, the method comprehensively calculates abnormality evaluation indexes χ of the target transmission lines i The calculation expression is as follows:where e is expressed as a natural constant, ω 1 And omega 2 Respectively expressed as the set environmental interference value and the duty ratio weight to which the power quality evaluation index belongs.
Acquiring an abnormal power transmission line assessment index threshold value from a power system information base, comparing each target power transmission line abnormal assessment index with the abnormal power transmission line assessment index threshold value, and if the abnormal power transmission line assessment index of a certain target power transmission line is higher than the abnormal power transmission line assessment index threshold value, marking the power transmission line as an abnormal operation and maintenance line.
As a further method, the analysis of the abnormal situation of each power device of each Chang Yunwei line is specifically performed by the following steps: statistics of differencesA normal operation and maintenance circuit for monitoring the vibration signals of the power equipment to obtain the waveform of the vibration signals of the power equipment of the abnormal operation and maintenance circuit and extracting the vibration frequency E of the power equipment of the abnormal operation and maintenance circuit rt Simultaneously obtaining the reference standard vibration frequency E of the power equipment from the power system information base 0 。
Obtaining standard vibration signal waveforms of the power equipment from the power system information base, and extracting the lengths of the standard vibration signal waveformsThe vibration signal waveform of each power equipment of each abnormal operation and maintenance line is subjected to superposition comparison with the standard vibration signal waveform, so that the superposition length of the vibration signal waveform of each power equipment of each abnormal operation and maintenance line is obtained>
Comprehensively calculating vibration signal abnormality indexes of all power equipment of all abnormal operation and maintenance linesThe calculation expression is as follows: />Wherein DeltaE is expressed as a set allowable deviation vibration frequency, v 1 And v 2 The correction factors are respectively expressed as correction factors corresponding to the set vibration frequency and the superposition length of the vibration signal waveforms, r is expressed as the number of each abnormal operation and maintenance line, r=1, 2,3, & h, h is expressed as the total number of the abnormal operation and maintenance lines, t is expressed as the number of each electric device, t=1, 2,3, & S, S is expressed as the total number of the electric devices.
Identifying and extracting partial discharge times of each power equipment of Chang Yunwei lines in different monitoring periodsAnd the current signal waveform and the voltage signal waveform of each partial dischargeAnd the analysis results in an average amplitude of the current signal for each partial discharge +.>And average amplitude +.>
Obtaining critical amplitude of partial discharge current signal of power equipment from power system information baseAnd voltage signal critical amplitude +.>Comprehensively calculating partial discharge abnormality index of each power equipment of each abnormal operation and maintenance line>The calculation expression is as follows: />Wherein τ 1 Expressed as an abnormality affecting factor corresponding to the set unit partial discharge number τ 2 And τ 3 The current signal average amplitude and the voltage signal average amplitude of the partial discharge are respectively set, d is the number of each partial discharge, d=1, 2,3,..g, g is the number of times of the partial discharge.
As a further method, the comprehensive calculation of the abnormality evaluation index ε of each power equipment of each abnormal operation and maintenance line rt The calculation expression is as follows:wherein->And->The vibration signal abnormality index and the partial discharge abnormality index are respectively set as influence factors corresponding to each other.
As a further method, the detection inspection is performed on each sub-combination link of each Chang Yunwei line, and the specific analysis process is as follows: disposing a plurality of inspection points on each sub-combination link of each different Chang Yunwei line, observing the current position of each inspection point of each sub-combination link by using an inspection unmanned plane, extracting the initial inspection position of each inspection point, and further obtaining the offset linear distance of each sub-combination link of each abnormal operation and maintenance line at each inspection point
The clockwise angle measurement direction is used for monitoring the included angle between the line tangent line of each inspection point and the horizontal ground to obtain the tangent angle of each inspection point of each sub-combination link of each abnormal operation and maintenance lineSimultaneously obtaining the tangent angle of the original inspection pointComprehensively calculating the position deviation abnormality index ++of each sub-combination link of each abnormal operation and maintenance line>The calculation expression is as follows: />Wherein Deltaθ is expressed as the set allowable deviation tangential angle, sigma 1 Expressed as correction factor, sigma, corresponding to the set tangential angle 2 The set unit distance is represented by a positional deviation influence factor, z is represented by the number of each sub-combination link, z=1, 2,3,..u, u is represented by the total number of sub-combination links, b is represented by the number of each inspection point, b=1, 2,3,..c, c is represented by the total number of inspection points.
Monitoring the vertical height to the low point of each sub-combined link of each different Chang Yunwei line to obtain the vertical height T to the low point of each sub-combined link rz Simultaneously, the critical-to-low point vertical height T of the power transmission line is obtained from the power system information base 0 。
As a further method, the abnormal situation value of each sub-combination link of each abnormal operation and maintenance line is calculatedThe calculation expression is as follows: />Wherein θ is 1 And theta 2 Respectively expressed as an abnormality situation influencing factor corresponding to the set position deviation abnormality index and the vertical height to the low point.
As a further method, the positioning and early warning are sequentially carried out on the power equipment and the sub-combination links of the abnormal operation and maintenance line, and the specific analysis process is as follows: acquiring an abnormal power equipment assessment index threshold value from a power system information base, comparing the abnormal power equipment assessment index of each abnormal operation and maintenance line with the abnormal power equipment assessment index threshold value, feeding back the abnormal operation and maintenance line where the power equipment is located if the abnormal power equipment assessment index is higher than the abnormal power equipment assessment index threshold value, and carrying out positioning early warning on the power equipment.
And similarly, positioning and early warning are carried out on abnormal conditions of the sub-combined links.
The second aspect of the present invention provides an early warning system for an electric power system, comprising: the power transmission line abnormality evaluation module is used for analyzing the abnormality of each target power transmission line, comprehensively calculating the abnormality evaluation index of each target power transmission line and screening each abnormal operation and maintenance line.
The power equipment abnormality evaluation module is used for analyzing the abnormality conditions of the power equipment of the different Chang Yunwei lines and comprehensively calculating the abnormality evaluation indexes of the power equipment of the abnormal operation and maintenance lines.
The sub-combination link anomaly evaluation module is used for equally dividing each abnormal operation and maintenance line, detecting and inspecting each sub-combination link of each different Chang Yunwei line, and calculating the anomaly situation value of each sub-combination link of each abnormal operation and maintenance line.
And the data integration processing module is used for carrying out positioning early warning on the power equipment and the sub-combination links of the abnormal operation and maintenance line in sequence through data integration processing.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects: (1) According to the early warning method and system for the electric power system, the environment interference condition and the electric power quality condition of the electric power line are monitored, the abnormal operation and maintenance line is screened, the abnormal condition of the electric power equipment and the sub-combination link of the abnormal operation and maintenance line is monitored, the fault position is accurately positioned, the safety and stability of the electric power system are improved, and the maintenance cost of the electric power system fault is reduced through real-time monitoring and timely early warning of the early warning system for the electric power system.
(2) According to the invention, the working environment of the power transmission line is monitored, including the environmental wind speed and the environmental corrosiveness, so that the monitoring of the working environment of the power transmission line can help to detect potential risk factors, and is helpful to discover potential risks in advance, and preventive measures are taken, so that the safety and the reliability of a power system are improved, meanwhile, the monitoring of the environment can better know the running state of equipment, the load of the power transmission line is adjusted according to weather conditions, and the energy efficiency is improved.
(3) According to the invention, the environment interference condition and the electric power quality condition of the power transmission line are monitored, so that the abnormal operation and maintenance line is screened, the accurate positioning of the fault position is realized, the fault response time is shortened, the influence of the fault on the normal operation of the system is reduced, meanwhile, the repairing measures can be adopted more rapidly by rapidly positioning the fault, the power failure time is reduced, the reliability of the electric power system is improved, and the operation and maintenance cost is reduced.
(4) According to the invention, the position of the sub-combined line of the abnormal operation and maintenance line and the vertical height to the low point are monitored, so that the operation state of the power transmission line is obtained in real time, the occurrence of line disconnection or other faults caused by the fact that the vertical height to the low point is too low is avoided, meanwhile, the position of the power transmission line is monitored, the abnormal condition of the power transmission line can be found, further investigation and maintenance are carried out on the power transmission line, the occurrence of potential faults is avoided, and the safety of a power system is improved.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of system module connection according to the present invention.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Referring to fig. 1, a first aspect of the present invention provides a power system early warning method, including: analyzing the abnormal condition of each target power transmission line, comprehensively calculating the abnormal evaluation index of each target power transmission line, and screening each abnormal operation and maintenance line.
Specifically, the analysis of the abnormal condition of each target transmission line includes the following specific analysis processes: monitoring the working environment of each target power transmission line to obtain the wind direction, wind power grade and air density rho of the working environment of each target power transmission line i And the integrated wind speed V i The length of each target power transmission line is obtained from the power system information base, and the body surface area of each target power transmission line is obtained as the exposed surface area A of each target power transmission line i At the same time according to each targetThe wind direction and wind power level of the working environment of the power transmission line are matched from the power system information base to obtain the resistance coefficient Cd of each target power transmission line i Comprehensively calculating wind load F of each target transmission line i The calculation expression is as follows:where i is denoted as the number of each target transmission line, i=1, 2,3,...
It should be explained that, in this embodiment, wind speed and wind direction of the working environment of the power transmission line are respectively monitored by using the anemometer and the wind vane, so that wind load of the power transmission line is analyzed by the system, the change of wind power can be known in time through monitoring the wind load, the influence of the wind load on the power transmission line is judged, the stability of the line structure is evaluated, and meanwhile, corresponding measures can be taken for reinforcing the line through monitoring the wind load, so that the influence of strong wind on the power transmission line is reduced, and the reliability of the power system is improved.
The corrosiveness of the working environment of each target power transmission line is monitored by arranging a plurality of monitoring points, and the humidity W of each monitoring point of the working environment of each target power transmission line is obtained ij Sulfide concentration S ij And chloride concentration Cl ij Meanwhile, the proper working humidity range of the target line is obtained from the power system information base, and the intermediate value of the range is extracted as the reference standard working humidity of the target line and is marked as W 0 Comprehensively calculating corrosion risk degree evaluation indexes of working environments of all target power transmission linesWherein DeltaW is expressed as the set reference allowable deviation humidity, S 0 And Cl 0 The critical sulfide concentration and critical chloride concentration, ζ, are respectively expressed as the set target line working environment 1 、ζ 2 And zeta 3 The corrosion risk influence factors are respectively expressed as set humidity, sulfide concentration and chloride concentration, j is expressed as the number of each monitoring point, j=1, 2, 3.
It should be explained that, in this embodiment, the humidity sensor and the gas sensor are used to monitor the humidity and the acid gas concentration of the working environment of the power transmission line, so as to evaluate the corrosiveness of the working environment of the power transmission line.
Obtaining the maximum bearing wind load F of the target line from the power system information base 0 Comprehensively calculating the environmental interference value alpha of each target transmission line i The calculation expression is as follows:wherein psi is 1 Sum phi 2 Expressed as interference weight factors corresponding to the set wind load and corrosion risk level, respectively.
And monitoring the working parameters of each target power transmission line, and calculating the power quality evaluation index of each target power transmission line.
Further, the calculating the power quality evaluation index of each target transmission line comprises the following specific analysis and calculation processes: monitoring working parameters of each target power transmission line with a set monitoring period, and dividing monitoring time points with a set time interval to obtain the grounding resistance R of each target power transmission line at each monitoring time point iq Monitoring the number of voltage sags N in a cycle i According to the numerical expressionCalculating the average grounding resistance of each target transmission line>Where q is denoted as the number of each monitoring time point, q=1, 2,3,..k, k is denoted as the total number of monitoring time points.
It should be explained that, in this embodiment, the ground resistance tester is used to monitor the ground resistance of the power transmission line, where the ground resistance is an important parameter in the ground system, which affects the performance and safety of the power system, and by monitoring the ground resistance, a potential problem can be found as early as possible, so as to ensure that the system can effectively eliminate the current when the ground current or the fault occurs, thereby reducing the risk of electric shock and ensuring the stability of the power system.
Comprehensively calculating power quality evaluation index beta of each target power transmission line i The calculation expression is as follows:wherein R is 0 And N 0 Respectively expressed as the maximum allowable ground resistance of the power transmission line and the maximum allowable voltage dip number of the power transmission line, and xi 1 And xi 2 The power quality influence factors are respectively expressed as the set grounding resistance and the corresponding voltage sag times.
In a specific embodiment, the working environment of the power transmission line is monitored, including the ambient wind speed and the ambient corrosiveness, so that the monitoring of the working environment of the power transmission line can help to detect potential risk factors, potential risks can be found in advance, preventive measures are taken, and therefore the safety and the reliability of a power system are improved, meanwhile, the operation state of equipment can be better known through the monitoring of the environment, the load of the power transmission line is adjusted according to weather conditions, and the energy efficiency is improved.
Specifically, the abnormality evaluation index χ of each target transmission line is comprehensively calculated i The calculation expression is as follows:where e is expressed as a natural constant, ω 1 And omega 2 Respectively representing the set environmental interference value and the duty ratio weight of the power quality evaluation index;
acquiring an abnormal power transmission line assessment index threshold value from a power system information base, comparing each target power transmission line abnormal assessment index with the abnormal power transmission line assessment index threshold value, and if the abnormal power transmission line assessment index of a certain target power transmission line is higher than the abnormal power transmission line assessment index threshold value, marking the power transmission line as an abnormal operation and maintenance line.
In a specific embodiment, through monitoring the environment interference condition and the power quality condition of the power transmission line, and then screening the abnormal operation and maintenance line, the accurate positioning of the fault position is realized, the fault response time is shortened, and therefore the influence of the fault on the normal operation of the system is reduced.
Analyzing the abnormal conditions of the power equipment of the Chang Yunwei lines, and comprehensively calculating the abnormality evaluation indexes of the power equipment of the abnormal operation and maintenance lines.
Specifically, the analysis of the abnormal conditions of the power equipment of the different Chang Yunwei lines includes the following specific analysis processes: counting the abnormal operation and maintenance lines, monitoring the vibration signals of the power equipment to obtain the waveform of the vibration signals of the power equipment of the abnormal operation and maintenance lines, and extracting the vibration frequency E of the power equipment of the abnormal operation and maintenance lines rt Simultaneously obtaining the reference standard vibration frequency E of the power equipment from the power system information base 0 。
It should be explained that, in this embodiment, the vibration sensor is used to monitor the vibration signal of the power device, and by monitoring the vibration of the power device, the potential problem can be identified and solved, so as to improve the reliability of the device, and help to avoid the occurrence of sudden faults, and improve the stability and reliability of the power system.
Obtaining standard vibration signal waveforms of the power equipment from the power system information base, and extracting the lengths of the standard vibration signal waveformsThe vibration signal waveform of each power equipment of each abnormal operation and maintenance line is subjected to superposition comparison with the standard vibration signal waveform, so that the superposition length of the vibration signal waveform of each power equipment of each abnormal operation and maintenance line is obtained>
Comprehensively calculating vibration signal abnormality indexes of all power equipment of all abnormal operation and maintenance linesThe calculation expression is as follows: />Wherein DeltaE is expressed as a set allowable deviation vibration frequency, v 1 And v 2 The correction factors are respectively expressed as correction factors corresponding to the set vibration frequency and the superposition length of the vibration signal waveforms, r is expressed as the number of each abnormal operation and maintenance line, r=1, 2,3, & h, h is expressed as the total number of the abnormal operation and maintenance lines, t is expressed as the number of each electric device, t=1, 2,3, & s, s is expressed as the total number of the electric devices.
Identifying and extracting partial discharge times of each power equipment of Chang Yunwei lines in different monitoring periodsAnd the current signal waveform and the voltage signal waveform of each partial discharge, and further analyzing to obtain the average amplitude of the current signal of each partial discharge>And average amplitude +.>
It should be explained that, in this embodiment, the current sensor and the voltage sensor are used to monitor the partial discharge current signal and the partial discharge voltage signal respectively, where the partial discharge phenomenon occurs when the electric field strength reaches a certain critical value in the electrical insulation system, and may be signs of damage or problem of the insulation system, and by monitoring and analyzing the partial discharge phenomenon of the electrical equipment, the potential problem can be found as soon as possible, so as to prevent the occurrence of equipment damage and power failure accidents.
Obtaining critical amplitude of partial discharge current signal of power equipment from power system information baseAnd voltage signal critical amplitude +.>Comprehensively calculating partial discharge abnormality index of each power equipment of each abnormal operation and maintenance line>The calculation expression is as follows: />Wherein τ 1 Expressed as an abnormality affecting factor corresponding to the set unit partial discharge number τ 2 And τ 3 The current signal average amplitude and the voltage signal average amplitude of the partial discharge are respectively set, d is the number of each partial discharge, d=1, 2,3,..g, g is the number of times of the partial discharge.
Further, the power equipment abnormality evaluation index epsilon of each abnormal operation and maintenance line is comprehensively calculated rt The calculation expression is as follows:wherein->And->The vibration signal abnormality index and the partial discharge abnormality index are respectively set as influence factors corresponding to each other.
And thirdly, equally dividing each abnormal operation and maintenance line, detecting and inspecting each sub-combination link of each different Chang Yunwei line, and calculating the abnormal situation value of each sub-combination link of each abnormal operation and maintenance line.
Specifically, the detection inspection is performed on each sub-combination link of each Chang Yunwei line, and the specific analysis process is as follows: disposing a plurality of inspection points on each sub-combination link of each different Chang Yunwei line, observing the current position of each inspection point of each sub-combination link by using an inspection unmanned plane, extracting the initial inspection position of each inspection point, and further obtaining the offset linear distance of each sub-combination link of each abnormal operation and maintenance line at each inspection point
The clockwise angle measurement direction is used for monitoring the included angle between the line tangent line of each inspection point and the horizontal ground to obtain the tangent angle of each inspection point of each sub-combination link of each abnormal operation and maintenance lineSimultaneously obtaining the tangent angle of the original inspection pointComprehensively calculating the position deviation abnormality index ++of each sub-combination link of each abnormal operation and maintenance line>The calculation expression is as follows: />Wherein Deltaθ is expressed as the set allowable deviation tangential angle, sigma 1 Expressed as correction factor, sigma, corresponding to the set tangential angle 2 The set unit distance is represented by a positional deviation influence factor, z is represented by the number of each sub-combination link, z=1, 2,3,..u, u is represented by the total number of sub-combination links, b is represented by the number of each inspection point, b=1, 2,3,..c, c is represented by the total number of inspection points.
It should be explained that, in this embodiment, the angle measurement is the angle measurement in the side view direction, and the tangential angle is the minimum angle between the line tangential line and the horizontal ground.
Monitoring the vertical height to the low point of each sub-combined link of each different Chang Yunwei line to obtain the vertical height T to the low point of each sub-combined link rz Simultaneously, the critical-to-low point vertical height T of the power transmission line is obtained from the power system information base 0 。
It should be explained that, in this embodiment, the vertical height of the power transmission line to the low point is monitored by the inspection unmanned aerial vehicle, and the vertical height of the power transmission line to the low point is too small, which may cause line disconnection or other faults, and increase the risk of accidents such as electric shock and fire, and by monitoring the vertical height of the power transmission line to the low point, whether the line sags or not can be found in time, thereby avoiding safety accidents caused by line sagging.
Further, the abnormal situation value of each sub-combination link of each abnormal operation and maintenance line is calculatedThe calculation expression is as follows: />Wherein θ is 1 And theta 2 Respectively expressed as an abnormality situation influencing factor corresponding to the set position deviation abnormality index and the vertical height to the low point.
In a specific embodiment, the position of the sub-combination line of the abnormal operation and maintenance line and the vertical height to the low point are monitored, so that the operation state of the power transmission line is obtained in real time, line disconnection or other faults caused by the fact that the vertical height to the low point is too low in the power transmission line are avoided, meanwhile, the position of the power transmission line is monitored, the abnormal condition of the power transmission line can be found, further investigation and maintenance are conducted on the power transmission line, the occurrence of potential faults is avoided, and the safety of a power system is improved.
And fourthly, positioning and early warning are sequentially carried out on the power equipment and the sub-combination links of the abnormal operation and maintenance line through data integration processing.
Specifically, the positioning early warning is carried out on the power equipment and the sub-combination links of the abnormal operation and maintenance line in sequence, and the specific analysis process is as follows: acquiring an abnormal power equipment assessment index threshold value from a power system information base, comparing the abnormal power equipment assessment index of each abnormal operation and maintenance line with the abnormal power equipment assessment index threshold value, feeding back the abnormal operation and maintenance line where the power equipment is located if the abnormal power equipment assessment index is higher than the abnormal power equipment assessment index threshold value, and carrying out positioning early warning on the power equipment.
And similarly, positioning and early warning are carried out on abnormal conditions of the sub-combined links.
It is to be explained that the positioning and early warning are carried out on the abnormal condition of the sub-combination link, and the specific steps are as follows: and acquiring an abnormal situation value threshold value of the sub-combined link from the power system information base, comparing the abnormal situation value of each sub-combined link of each abnormal operation and maintenance line with the abnormal situation value threshold value of the sub-combined link, and if the abnormal situation value Gao Yuzi of a certain sub-combined link belongs to the abnormal situation value threshold value of the combined link, feeding back the abnormal operation and maintenance line of the sub-combined link and positioning the sub-combined link.
Referring to fig. 2, a second aspect of the present invention provides an early warning system for an electric power system, including: the system comprises a transmission line abnormality evaluation module, a power equipment abnormality evaluation module, a sub-combination link abnormality evaluation module, a data integration processing module and a power system information base.
The power transmission line abnormality evaluation module is respectively connected with the power equipment abnormality evaluation module and the sub-combination link abnormality evaluation module, the power equipment abnormality evaluation module and the sub-combination link abnormality evaluation module are connected with the data integration processing module, and the power transmission line abnormality evaluation module, the power equipment abnormality evaluation module, the sub-combination link abnormality evaluation module and the data integration processing module are connected with the power system information base.
The power transmission line abnormality evaluation module is used for analyzing the abnormality of each target power transmission line, comprehensively calculating abnormality evaluation indexes of each target power transmission line and screening each abnormal operation and maintenance line.
The power equipment abnormality evaluation module is used for analyzing the abnormality conditions of the power equipment of the different Chang Yunwei lines and comprehensively calculating the abnormality evaluation indexes of the power equipment of the abnormal operation and maintenance lines.
The sub-combination link anomaly evaluation module is used for equally dividing each abnormal operation and maintenance line, detecting and inspecting each sub-combination link of each different Chang Yunwei line, and calculating the anomaly situation value of each sub-combination link of each abnormal operation and maintenance line.
The data integration processing module is used for carrying out positioning early warning on the power equipment and the sub-combination links of the abnormal operation and maintenance line in sequence through data integration processing.
It should be explained that, the above power system information base is configured to store the length and the body surface area of each target power transmission line, the resistance coefficient of each target power transmission line corresponding to different wind levels in each wind direction working environment, the suitable working humidity range of the target line and the maximum wind load bearing, the power transmission line abnormal assessment index threshold, the reference standard vibration frequency and standard vibration signal waveform of the power equipment, the current signal critical amplitude and the voltage signal critical amplitude of partial discharge of the power equipment, the linear density and the critical-to-low point vertical height of the unit length of the power transmission line, the power equipment abnormal assessment index threshold, and the abnormal situation value threshold to which the sub-combination link belongs.
The foregoing is merely illustrative of the structures of this invention and various modifications, additions and substitutions for those skilled in the art can be made to the described embodiments without departing from the scope of the invention or from the scope of the invention as defined in the accompanying claims.
Claims (10)
1. An early warning method for an electric power system is characterized by comprising the following steps:
analyzing abnormal conditions of all target power transmission lines, comprehensively calculating abnormal evaluation indexes of all target power transmission lines, and screening all abnormal operation and maintenance lines;
analyzing the abnormal conditions of the power equipment of each different Chang Yunwei line, and comprehensively calculating the abnormality evaluation index of the power equipment of each abnormal operation and maintenance line;
step three, carrying out equidistant division on each abnormal operation and maintenance line, detecting and inspecting each sub-combination link of each different Chang Yunwei line, and calculating an abnormal situation value of each sub-combination link of each abnormal operation and maintenance line;
and fourthly, integrating the abnormal evaluation indexes of the power equipment of the different Chang Yunwei lines and the abnormal situation values of the sub-combination links of the different operation and maintenance lines, and positioning and early warning the power equipment of the abnormal operation and maintenance lines and the sub-combination links according to the integration processing results.
2. The power system warning method according to claim 1, characterized in that: the formula adopted for calculating the abnormality evaluation index of each target transmission line is as follows:
in χ i Representing the abnormality evaluation index of the target transmission line, e is represented as a natural constant omega 1 And omega 2 Respectively expressed as the set duty ratio weight belonged to the environmental interference value and the power quality evaluation index, beta i The power quality evaluation index indicating the target transmission line, i indicating the number of each target transmission line, i=1, 2,3,.. i And representing the environmental interference value of the target transmission line.
3. The power system warning method according to claim 2, characterized in that: the power quality evaluation index of the target power transmission line and the environmental interference value of the target power transmission line are respectively calculated by adopting formulas, and the method comprises the following steps of:
the expression of the power quality evaluation index of the target power transmission line is:
the calculation expression of the environmental interference value of the target transmission line is as follows:
wherein R is 0 And N 0 Respectively expressed as the maximum allowable ground resistance of the power transmission line and the maximum allowable voltage dip number of the power transmission line, and xi 1 And xi 2 The power quality influence factors are respectively expressed as the set grounding resistance and the corresponding power quality influence factors of the voltage sag times; n (N) i The number of voltage dips in the monitoring period is indicated,represents the average ground resistance, ψ, of the target transmission line 1 Sum phi 2 The interference weight factors are respectively expressed as the interference weight factors corresponding to the set wind load and corrosion risk degree; f (F) i Representing wind load of target transmission line, da i An evaluation index for indicating the corrosion risk level of the working environment of the target transmission line, F 0 Indicating the maximum wind load experienced by the target line.
4. The power system warning method according to claim 1, characterized in that: the specific formula of each power equipment abnormality evaluation index of the abnormal operation and maintenance line is as follows:
wherein ε rt An abnormality evaluation index for each power equipment representing an abnormal operation and maintenance line,and->Respectively expressed as the influence factors corresponding to the set vibration signal abnormality index and the partial discharge abnormality index, ++>Vibration signal abnormality index of each power equipment representing abnormal operation and maintenance line, < ->Partial discharge abnormality index indicating each power device of the abnormal operation and maintenance line.
5. The power system warning method of claim 4, wherein: the specific calculation method of the vibration signal abnormality index of each power device of the abnormal operation and maintenance line and the partial discharge abnormality index of each power device of the abnormal operation and maintenance line is as follows:
counting each abnormal operation and maintenance line, monitoring vibration signals of each power device to obtain vibration signal waveforms of each power device of each abnormal operation and maintenance line, extracting vibration frequencies of each power device of each abnormal operation and maintenance line, and acquiring reference standard vibration frequencies of the power devices from a power system information base;
obtaining standard vibration signal waveforms of the power equipment from an electric power system information base, extracting standard vibration signal waveform lengths, performing overlapping comparison on the vibration signal waveforms of the power equipment of each abnormal operation and maintenance line and the standard vibration signal waveforms to obtain the overlapping lengths of the vibration signal waveforms of the power equipment of each abnormal operation and maintenance line, and comprehensively calculating the vibration signal abnormality indexes of the power equipment of each abnormal operation and maintenance line;
identifying and extracting the partial discharge times of each power device of different Chang Yunwei circuits in the monitoring period, and analyzing the current signal waveform and the voltage signal waveform of each partial discharge to obtain the average amplitude of the current signal and the average amplitude of the voltage signal of each partial discharge;
acquiring a current signal critical amplitude and a voltage signal critical amplitude of partial discharge of the power equipment from a power system information base, and comprehensively calculating partial discharge abnormality indexes of the power equipment of each abnormal operation and maintenance line;
the calculation formula of the vibration signal abnormality index of each power device of the abnormal operation and maintenance line is as follows:
the calculation formula of the partial discharge abnormality index of each power equipment of the abnormal operation and maintenance line is as follows:
in the method, in the process of the invention,a vibration signal abnormality index indicating each power device of the abnormal operation and maintenance line; delta E is expressed as a set allowable deviation vibration frequency, v 1 And v 2 The correction factors are respectively expressed as correction factors corresponding to the set vibration frequency and the superposition length of the vibration signal waveforms, r is expressed as the number of each abnormal operation and maintenance line, r=1, 2,3, & h, h are expressed as the total number of the abnormal operation and maintenance lines, t is expressed as the number of each electric device, t=1, 2,3, & S, S is expressed as the total number of the electric devices; e (E) rt Representing the vibration frequency of each power equipment of the abnormal operation and maintenance line, E 0 Representing a reference standard vibration frequency of the electrical equipment; />Representing the waveform length of the standard vibration signal, < >>Representing the superposition length of the waveform of the vibration signal of the power equipment; τ 1 Expressed as an abnormality affecting factor corresponding to the set unit partial discharge number τ 2 And τ 3 The correction factors corresponding to the set average amplitude of the current signal and the average amplitude of the voltage signal are respectively expressed, d is expressed as the number of each partial discharge, d=1, 2,3,..g, g is expressed as the number of times of partial discharge; />Indicating the partial discharge times of each power equipment of different Chang Yunwei lines in the monitoring period, +.>Mean amplitude of the current signal representing the discharge, +.>Representing the average amplitude of the voltage signal; />Critical amplitude of current signal representing partial discharge of electrical equipment, < >>Represents the critical amplitude of the voltage signal, < >>Partial discharge abnormality index indicating each power device of the abnormal operation and maintenance line.
6. The power system warning method according to claim 1, characterized in that: and calculating abnormal situation values of all sub-combined links of all abnormal operation and maintenance lines, wherein the calculation expression is as follows:
in the method, in the process of the invention,representing abnormal situation value, theta, of each sub-combination link of each abnormal operation and maintenance line 1 And theta 2 Respectively expressed as an abnormality situation influencing factor corresponding to the set position deviation abnormality index and the vertical height to the low point, +.>Position shift abnormality index, T, representing each sub-combination link of an abnormal operation and maintenance line rz Representing the vertical height to the low point, T, of the sub-combined link 0 The critical to low point vertical height of the transmission line is expressed, z is expressed as the number of each sub-combined link, z=1, 2, 3.
7. The power system warning method of claim 6, wherein: the position offset anomaly index of each sub-combination link of the abnormal operation and maintenance line is obtained through a calculation formula, and the specific calculation process is as follows:
disposing a plurality of inspection points on each sub-combination link of each different Chang Yunwei line, observing the current position of each inspection point of each sub-combination link by using an inspection unmanned plane, and extracting the initial inspection position of each inspection point to obtain the offset linear distance of each sub-combination link of each abnormal operation and maintenance line at each inspection point;
the method comprises the steps of taking a clockwise direction as an angle measurement direction, monitoring the included angle between a line tangent line of each inspection point and the horizontal ground, obtaining the tangent angle of each inspection point of each sub-combination link of each abnormal operation and maintenance line, simultaneously obtaining the tangent angle of the original inspection point, comprehensively calculating the position deviation abnormal index of each sub-combination link of each abnormal operation and maintenance line, and calculating the position deviation abnormal index of each sub-combination link of each abnormal operation and maintenance line, wherein the calculation expression is as follows:
in the method, in the process of the invention,the position deviation abnormality index of each sub-combination link representing the abnormal operation and maintenance line, delta theta is expressed as a set allowable deviation tangential angle sigma 1 Expressed as correction factor, sigma, corresponding to the set tangential angle 2 The position deviation influencing factor is expressed as a set unit distance, b is expressed as the number of each inspection point, b=1, 2,3, & gt, c is expressed as the total number of the inspection points;representing the offset linear distance of each sub-combination link of the normal operation and maintenance line at each inspection point; />Tangential angle of each inspection point of each sub-combined link of the abnormal operation and maintenance line is represented by +.>And the tangent angle of the original inspection point is represented.
8. The power system warning method according to claim 3, characterized in that: the wind load of the target transmission line is calculated according to the following formula:
wherein ρ is i Representing air density, V i Represents the comprehensive wind speed, A i Representing the exposed surface area of the target transmission line by wind, cd i The drag coefficient of the target transmission line is represented by i, i=1, 2,3, & gt, n, the total number of the target transmission lines.
9. The power system warning method according to claim 1, characterized in that: the method is characterized in that the power equipment and the sub-combination links of the abnormal operation and maintenance line are sequentially positioned and pre-warned, and the specific analysis process is as follows:
acquiring an abnormal evaluation index threshold value of the power equipment and an abnormal situation value threshold value of each sub-combination link from a power system information base, comparing the abnormal evaluation index of the power equipment of each abnormal operation and maintenance line and the abnormal situation value of each sub-combination link with the abnormal evaluation index threshold value of the power equipment and the abnormal situation value threshold value of each sub-combination link respectively, feeding back the abnormal operation and maintenance line of the power equipment if the abnormal evaluation index of the power equipment is higher than the abnormal evaluation index threshold value of the power equipment, positioning and early warning the power equipment, feeding back the abnormal operation and maintenance line of the sub-combination link if the abnormal situation value of the sub-combination link is higher than the abnormal evaluation index threshold value of the power equipment, and positioning and early warning the sub-combination link.
10. An early warning system of an electric power system is characterized in that: comprising the following steps:
the power transmission line abnormality evaluation module is used for analyzing the abnormality of each target power transmission line, comprehensively calculating the abnormality evaluation index of each target power transmission line and screening each abnormal operation and maintenance line;
the power equipment abnormality evaluation module is used for analyzing the abnormality conditions of the power equipment of the different Chang Yunwei lines and comprehensively calculating the abnormality evaluation indexes of the power equipment of the abnormal operation and maintenance lines;
the sub-combination link anomaly evaluation module is used for equally dividing each abnormal operation and maintenance line, detecting and inspecting each sub-combination link of each different Chang Yunwei line, and calculating the anomaly situation value of each sub-combination link of each abnormal operation and maintenance line;
and the data integration processing module is used for carrying out positioning early warning on the power equipment and the sub-combination links of the abnormal operation and maintenance line in sequence through data integration processing.
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