CN112101805A - Power transmission line differential mountain fire prevention strategy analysis method - Google Patents
Power transmission line differential mountain fire prevention strategy analysis method Download PDFInfo
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Abstract
The invention provides a method for analyzing a differential mountain fire prevention strategy of a power transmission line, which comprises the following steps of: obtaining difference data of external environments, wherein the difference data of the external environments comprise vegetation feature data of a power transmission line corridor, meteorological feature data of the power transmission line corridor, topographic feature data of the power transmission line corridor and fire custom data of the power transmission line corridor, and performing multi-dimensional difference analysis on the power transmission line based on the difference data of the external environments; calculating a quantitative risk assessment value of the power transmission line forest fire disaster one by the base tower; and outputting a mountain fire prevention measure configuration scheme based on the power transmission line mountain fire prevention configuration strategy according to the quantitative risk evaluation result. The invention can improve the operation reliability of the power transmission line, avoid resource waste caused by unreasonable design and reconstruction, and further effectively improve the technical performance and the economical efficiency of the mountain fire prevention project.
Description
Technical Field
The invention relates to the technical field of power transmission line management, in particular to a power transmission line differential forest fire prevention strategy analysis method.
Background
The transmission line often spans dense forest areas or vegetation-rich areas. Under the combined action of factors such as living fire customs and weather generated by people, the power transmission line corridor is easy to explode and generate large-range mountain fire in times such as clearness, autumn harvest and the like or in the weather of continuous drought. The gap insulation strength of the overhead transmission line is reduced by the mountain fire, so that breakdown tripping is caused, the overhead transmission line is difficult to successfully coincide with the gap insulation strength, and the safety and stability of the power grid are threatened. Mountain fire disasters have seriously affected the safe operation of ultra-high voltage transmission lines and large power grids. In recent years, researchers have studied basic theories and key technologies of power transmission line forest fire occurrence rules, tripping mechanisms, monitoring and early warning, live fire extinguishing and the like. However, mountain fire occurrence is greatly influenced by human factors, space-time randomness is presented, and mountain fire points near the power transmission line are many-sided and wide, and researches show that: the power transmission line trip caused by mountain fire is influenced by various factors such as vegetation distribution of power transmission line corridors, landform, meteorological conditions, popular fire habits generated by people along the line, line body parameters and the like. In order to scientifically and effectively adopt the protection measures of the power transmission line against the forest fire and improve the economy and the effectiveness of the comprehensive treatment technical measures for preventing the forest fire of the power grid as much as possible, detailed research on the strategy of preventing the forest fire based on multiple influence factors is needed.
Disclosure of Invention
The invention aims to provide a method for analyzing a differential mountain fire prevention strategy of a power transmission line, so as to overcome or at least partially solve the problems in the prior art.
The invention provides a method for analyzing a differential mountain fire prevention strategy of a power transmission line, which comprises the following steps of:
obtaining difference data of external environments, wherein the difference data of the external environments comprise vegetation feature data of a power transmission line corridor, meteorological feature data of the power transmission line corridor, topographic feature data of the power transmission line corridor and fire custom data of the power transmission line corridor, and performing multi-dimensional difference analysis on the power transmission line based on the difference data of the external environments;
calculating a quantitative risk assessment value of the power transmission line forest fire disaster one by the base tower;
and outputting a mountain fire prevention measure configuration scheme based on the power transmission line mountain fire prevention configuration strategy according to the quantitative risk evaluation result.
Further, the performing multidimensional difference analysis on the power transmission line based on the difference data of the external environment specifically includes:
performing power transmission line corridor forest fire density difference analysis to obtain power transmission line corridor forest fire density difference information;
performing vulnerability difference analysis on the power transmission line against forest fire disasters, and identifying a forest fire trip high-power section of the power transmission line;
and (4) carrying out difference analysis on the mountain fire trip recovery time of the power transmission line, and acquiring the power supply recovery capability information of the power transmission line under the mountain fire condition.
Further, the obtaining of the difference information of the forest fire density of the power transmission line corridor specifically includes calculating a mountain fire density index rho of the power transmission line corridori，
Wherein, tWIs time, piRepresents tWMountain fire density n in line section from line tower i to tower i +1 within timeW,iThe number of times of mountain fires occurring in a certain distance from a line tower i to a line section corridor of a tower i + 1.
Further, the difference analysis of vulnerability of the power transmission line against forest fire disasters is performed, and the identification of the high-power section of the power transmission line in forest fire tripping specifically includes:
line section set S divided by taking tower as unitlineDefining the set of line sections with the occurrence of the trip of the fire of the mountain crossing as Shs. The line section set without mountain fire trip is SmsLine segment set SlineIs divided into (S)hs，Sms) Set ShsThe corresponding line segment is defined as WFHS, set SmsThe corresponding line section is defined as WFMS, and the mountain fire disaster vulnerability of the whole line is set S with the element number of 2mvul＝{s1,s2,…,s2mThe expression indicates that the expression of the expression,
for any natural number k (1. ltoreq. k. ltoreq.2 m), if the element SkIn the set SmsIn, then SkMountain fire disaster vulnerability V of mild section of corresponding mountain fire tripMS,kExpressed as:
wherein m is the corresponding line segment SkThe number of internal pole towers; n isw,kFor a line section SkThe times of mountain fire in a certain distance of the corridor;
if the element SkIn the set ShsIn, then SkMountain fire disaster vulnerability V of corresponding mountain fire trip high-rise sectionHS,kExpressed as:
wherein n isf,kIs SkCorresponding to the total mountain fire trip-out times in the line section, and m is 1.
Further, the difference analysis of the power transmission line forest fire trip recovery time is performed to obtain the power transmission line power supply recovery capability information under the forest fire condition, and the method specifically includes:
defining the outage time t of j trip of line section kTR,kjComprises the following steps:
tTR,kj＝tR,kj-tF,kj，
wherein, tR,kjThe recovery time after j trip of the line section k is obtained; t is tF,kjCalculating the j trip time of the k section of the line section, thereby calculating the average power failure time t of the mountain fire trip of the k section of the single transmission lineMT,k，tMT,kExpressed as:
wherein the content of the first and second substances,
further, the calculation of the quantitative risk assessment value of the forest fire disaster of the power transmission line by the base-pole tower specifically comprises the following steps:
calculating quantitative risk index value R of power transmission line forest fire disasterF,i，RF,iExpressed as:
RF,i＝ρiVitMT,i，
wherein, ViFor the vulnerability of mountain fire disaster in the line section from the line tower i to the tower i +1, tMT,iFor mountain fire in the section from tower i to tower i +1Average power off time of tripping.
Further, after the power transmission line forest fire disaster quantitative risk assessment value is calculated, correction is carried out on the forest fire disaster vulnerability of each line section according to the power transmission line forest fire disaster quantitative risk index value and power transmission line characteristic parameters, wherein the power transmission line characteristic parameters comprise terrain parameters, power transmission line body parameters and vegetation types.
A second aspect of the invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of the first aspect described above.
Compared with the prior art, the invention has the beneficial effects that:
according to the method for analyzing the differential mountain fire prevention strategy of the power transmission line, provided by the invention, the influence of various factors such as the vegetation characteristic, the meteorological characteristic, the topographic characteristic and the fire consumption custom of the power transmission line on the power transmission line is considered, the quantitative risk assessment value of the mountain fire disaster of the power transmission line is calculated, on the basis, the mountain fire tripping characteristic of the power transmission line is combined, and the differential mountain fire prevention measure configuration scheme is output based on the power transmission line mountain fire prevention configuration strategy, so that the operation reliability of the power transmission line can be improved, the resource waste caused by unreasonable design and reconstruction can be avoided, and the technical performance and the economical efficiency of mountain fire prevention engineering are effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive efforts.
Fig. 1 is a schematic overall flow chart of a method for analyzing a differentiated forest fire prevention strategy of a power transmission line according to an embodiment of the present invention.
Detailed Description
The principles and features of this invention are described below in conjunction with the following drawings, the illustrated embodiments are provided to illustrate the invention and not to limit the scope of the invention.
Referring to fig. 1, the invention provides a power transmission line differential mountain fire prevention strategy analysis method, which comprises the following steps:
s1, obtaining difference data of external environments, wherein the difference data of external environments comprise vegetation feature data of power transmission line corridors, meteorological feature data of power transmission line corridors, terrain feature data of power transmission line corridors and fire custom data of power transmission line corridors, and performing multi-dimensional difference analysis on the power transmission lines based on the difference data of external environments, so that basis is provided for subsequent calculation of quantitative risk assessment values of power transmission line forest fire disasters and scientific adoption of effective forest fire prevention configuration schemes.
And S2, calculating the quantitative risk assessment value of the mountain fire disaster of the power transmission line by base tower.
And S3, outputting a mountain fire prevention measure configuration scheme based on the power transmission line mountain fire prevention configuration strategy according to the quantitative risk assessment result.
In the step S1, the fire consumption custom data of the power transmission line corridor mainly comprise a fire consumption period, a fire source type and a daily fire consumption rule; the vegetation characteristics of the power transmission line corridor comprise vegetation type, vegetation height, vegetation heat value and the like; the power transmission line corridor meteorological feature data comprise precipitation, relative humidity, temperature, wind speed and the like; the power transmission line corridor terrain feature data comprise terrain types, slope angles, valley included angles, hillside and slope directions and the like. In some embodiments, the external environment difference data further includes transmission line body parameters and transmission line forest fire density data, where the transmission line body parameters include voltage class, transmission line ground distance, and inter-phase distance; the power transmission line forest fire density data are historical forest fire distribution data which are obtained by processing through a satellite forest fire wide area detection system and contain small-area forest fires.
Specifically, the performing multidimensional difference analysis on the power transmission line based on the difference data of the external environment specifically includes:
and (4) carrying out difference analysis on the power transmission line corridor forest fire density to obtain the difference information of the power transmission line corridor forest fire density.
And (4) carrying out vulnerability difference analysis on the power transmission line against the forest fire disaster, and identifying the forest fire trip high-power section of the power transmission line.
And (4) carrying out difference analysis on the mountain fire trip recovery time of the power transmission line, and acquiring the power supply recovery capability information of the power transmission line under the mountain fire condition.
The method comprises the steps that the power transmission line corridor mountain fire density difference analysis is carried out, the obtained power transmission line corridor mountain fire density difference information can represent the activity degree of mountain fire near the power transmission line corridor, mountain fire data mining is refined to a line section, and related personnel can conveniently and visually know mountain fire density difference.
As an example, the obtaining of the difference information of the transmission line corridor forest fire density is specifically to calculate a line corridor forest fire density index ρi，
Wherein, tWIs time, piRepresents tWMountain fire density n in line section from line tower i to tower i +1 within timeW,iThe number of times of mountain fires occurring in a certain distance from a line tower i to a line section corridor of a tower i +1 can be set according to actual conditions.
The mountain fire trip of the power transmission line is influenced by multiple factors such as vegetation types, topographic parameters, power transmission line body parameters, fire scene forms and the like, and at present, a method for accurately predicting the fire behavior of mountain fire and realizing calculation of the mountain fire trip probability of the power transmission line at low cost is difficult to find. And dividing the line into a forest fire trip mild section (WFMS) and a forest fire trip high-incidence section (WFHS) to perform vulnerability difference analysis on the power transmission line against the forest fire disaster.
For the line sections, dividing a line section set S by taking a tower as a unitlineDefining the set of line sections with the occurrence of the trip of the fire of the mountain crossing as Shs. The line section set without mountain fire trip is SmsLine segment set SlineIs divided into (S)hs，Sms) Set ShsThe corresponding line segment is defined as WFHS, set SmsThe corresponding line section is defined as WFMS, and the mountain fire disaster vulnerability of the whole line is set S with the element number of 2mvul＝{s1,s2,…,s2mThe expression indicates that the expression of the expression,
for any natural number k (1. ltoreq. k. ltoreq.2 m), if the element SkIn the set SmsIn, then SkMountain fire disaster vulnerability V of mild section of corresponding mountain fire tripMS,kExpressed as:
wherein m is the corresponding line segment SkThe number of internal pole towers; n isw,kFor a line section SkThe times of mountain fire in a certain distance of the corridor;
if the element SkIn the set ShsIn, then SkMountain fire disaster vulnerability V of corresponding mountain fire trip high-rise sectionHS,kExpressed as:
wherein n isf,kIs SkCorresponding to the total mountain fire trip-out times in the line section, and m is 1.
The physical significance of the equations (2) and (3) is the resistance of a certain line section to mountain fire disasters, and the greater the vulnerability value, the less the influence of mountain fire on the operation of the line section k, the tougher the line section, and conversely, the greater the influence, the more fragile the line section.
Along with the higher and higher requirements of national economy on the quality of electric energy, the recovery time of tripping of the power transmission line is one of important indexes considering the difference of faults of the power transmission line, and as an example, the difference analysis of the recovery time of tripping of the power transmission line is carried out to obtain the power information of recovering power supply of the power transmission line under the condition of forest fire, and the method specifically comprises the following steps:
defining the outage time t of j trip of line section kTR,kjComprises the following steps:
tTR,kj＝tR,kj-tF,kj (4)
wherein, tR,kjThe recovery time after j trip of the line section k is obtained; t is tF,kjCalculating the j trip time of the k section of the line section, thereby calculating the average power failure time t of the mountain fire trip of the k section of the single transmission lineMT,k，tMT,kExpressed as:
wherein the content of the first and second substances,
the existing power transmission line forest fire disaster risk assessment method has limited consideration factors, cannot quantify the power transmission line forest fire disaster risk assessment method to a line section, has limited guidance effect on a special section with poor micro-terrain, micro-weather and line disaster tolerance capability, and cannot realize refined forest fire disaster assessment, and in order to solve the problem, the step S2 is used for calculating the power transmission line forest fire disaster quantitative risk assessment value by base-pole towers one by one so as to identify the power transmission line forest fire hazard degree more accurately, and the method specifically comprises the following steps:
calculating quantitative risk index value R of power transmission line forest fire disasterF,i，RF,iExpressed as:
RF,i＝ρiVitMT,i (6)
wherein, ViFor the vulnerability of mountain fire disaster in the line section from the line tower i to the tower i +1, tMT,iFor the i to i +1 (i.e. the ith line zone in the calculation of the base-by-base tower)Section) trip average outage time.
In some embodiments, after the power transmission line forest fire disaster quantitative risk assessment value is calculated, correction is performed on forest fire disaster vulnerability of each line section according to a power transmission line forest fire disaster quantitative risk index value and power transmission line characteristic parameters, wherein the power transmission line characteristic parameters include terrain parameters, power transmission line body parameters and vegetation types, and therefore difference of forest fire disaster risks of each line section is further represented in a refined mode. And grading the risk index values of the line sections obtained by calculation by adopting a natural discontinuity point grading method for each tower in the analyzed line sections. As can be seen from the expressions (2), (3) and (6), the risk index value can effectively amplify the vulnerability of the historical trip section, and the identification precision of the forest fire hazard degree of the power transmission line can be effectively improved.
In step S3, according to the calculated risk assessment value, a power transmission line anti-forest fire configuration scheme is output in combination with a power transmission line anti-forest fire configuration strategy, so as to assist relevant personnel to perform targeted arrangement according to the anti-forest fire configuration scheme, thereby ensuring smooth operation of the power transmission line.
As an example, the power transmission line mountain fire prevention configuration policy includes a design infrastructure policy, an operation maintenance policy, and a scheduling control policy, and each policy includes a defense type policy and a disposal type policy, as shown in table 1.
TABLE 1 Power Transmission line anti-mountain fire configuration strategy
The invention also provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the method of the preceding embodiment.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A power transmission line differential forest fire prevention strategy analysis method is characterized by comprising the following steps:
obtaining difference data of external environments, wherein the difference data of the external environments comprise vegetation feature data of a power transmission line corridor, meteorological feature data of the power transmission line corridor, topographic feature data of the power transmission line corridor and fire custom data of the power transmission line corridor, and performing multi-dimensional difference analysis on the power transmission line based on the difference data of the external environments;
calculating a quantitative risk assessment value of the power transmission line forest fire disaster one by the base tower;
and outputting a mountain fire prevention measure configuration scheme based on the power transmission line mountain fire prevention configuration strategy according to the quantitative risk evaluation result.
2. The method for analyzing the differential forest fire prevention strategy of the power transmission line according to claim 1, wherein the performing multi-dimensional differential analysis on the power transmission line based on the differential data of the external environment specifically comprises:
performing power transmission line corridor forest fire density difference analysis to obtain power transmission line corridor forest fire density difference information;
performing vulnerability difference analysis on the power transmission line against forest fire disasters, and identifying a forest fire trip high-power section of the power transmission line;
and (4) carrying out difference analysis on the mountain fire trip recovery time of the power transmission line, and acquiring the power supply recovery capability information of the power transmission line under the mountain fire condition.
3. The method for analyzing the differential forest fire prevention strategy of the power transmission line according to claim 2, characterized in that:
obtaining the difference information of the intensity of the forest fire in the power transmission line corridor, specifically calculating the intensity index rho of the forest fire in the power transmission line corridori，
Wherein, tWIs time, piRepresents tWMountain fire density n in line section from line tower i to tower i +1 within timeW,iThe number of times of mountain fires occurring in a certain distance from a line tower i to a line section corridor of a tower i + 1.
4. The method for analyzing the differential forest fire prevention strategy of the power transmission line according to claim 2, wherein the step of performing the differential analysis on the vulnerability of the power transmission line against forest fire disasters and identifying the forest fire trip high-incidence section of the power transmission line specifically comprises the following steps:
line section set S divided by taking tower as unitlineDefining the set of line sections with the occurrence of the trip of the fire of the mountain crossing as Shs. The line section set without mountain fire trip is SmsLine segment set SlineIs divided into (S)hs，Sms) Set ShsThe corresponding line segment is defined as WFHS, set SmsThe corresponding line section is defined as WFMS, and the mountain fire disaster vulnerability of the whole line is set S with the element number of 2mvul＝{s1,s2,…,s2mThe expression indicates that the expression of the expression,
for any natural number k (1. ltoreq. k. ltoreq.2 m), if the element SkIn the set SmsIn, then SkMountain fire disaster vulnerability V of mild section of corresponding mountain fire tripMS,kExpressed as:
wherein m is the corresponding line segment SkThe number of internal pole towers; n isw,kFor a line section SkThe times of mountain fire in a certain distance of the corridor;
if the element SkIn the set ShsIn, then SkMountain fire disaster vulnerability V of corresponding mountain fire trip high-rise sectionHS,kExpressed as:
wherein n isf,kIs SkCorresponding to the total mountain fire trip-out times in the line section, and m is 1.
5. The method for analyzing the differential forest fire prevention strategy of the power transmission line according to claim 2, wherein the differential analysis of the forest fire tripping recovery time of the power transmission line is performed to obtain the capability information of the power transmission line for recovering power supply under the forest fire condition, and specifically comprises the following steps:
defining the outage time t of j trip of line section kTR,kjComprises the following steps:
tTR,kj＝tR,kj-tF,kj，
wherein, tR,kjThe recovery time after j trip of the line section k is obtained; t is tF,kjCalculating the j trip time of the k section of the line section, thereby calculating the average power failure time t of the mountain fire trip of the k section of the single transmission lineMT,k，tMT,kExpressed as:
wherein the content of the first and second substances,
6. the method for analyzing the differential forest fire prevention strategy of the power transmission line according to claim 1, wherein the step-by-step pole tower-based calculation of the quantitative risk assessment value of the forest fire disaster of the power transmission line specifically comprises the following steps:
calculating quantitative risk index value R of power transmission line forest fire disasterF,i，RF,iExpressed as:
RF,i＝ρiVitMT,i，
wherein, ViFor the vulnerability of mountain fire disaster in the line section from the line tower i to the tower i +1, tMT,iThe average power failure time of mountain fire tripping in the line section from the line tower i to the tower i +1 is obtained.
7. The method for analyzing the differential forest fire prevention strategy of the power transmission line according to claim 6 is characterized by further comprising the step of correcting the forest fire disaster vulnerability of each line section according to the power transmission line forest fire disaster quantitative risk index value and the power transmission line characteristic parameters after calculating the power transmission line forest fire disaster quantitative risk assessment value, wherein the power transmission line characteristic parameters comprise terrain parameters, power transmission line body parameters and vegetation types.
8. The method for analyzing the power transmission line differential anti-forest fire strategy of claim 1, wherein the power transmission line anti-forest fire configuration strategy comprises a design infrastructure strategy, an operation maintenance strategy and a scheduling control strategy, and each strategy comprises a defense strategy and a disposal strategy.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of any of claims 1-8.
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