CN105809574A - Method for judging cloud-to-ground lightning high-risk section of line corridor in combination with topographic parameters - Google Patents
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Abstract
The invention discloses a method for judging a cloud-to-ground lightning high-risk section of a line corridor in combination with topographic parameters.The method comprises the steps of firstly, fitting the relation between a thunder and lightning day and the cloud-to-ground lightning density, conducting preliminary screening on lightning hazard risks of the line combination with the cloud-to-ground lightning density value and a line lightning stroke historical failure database, subsequently, conducting TPI analysis, combining the cloud-to-ground lightning density with topographic features, conducting further screening on the TPI threshold value, then calculating the back-striking, the shielding failure and total lightning trip-out rate, and finally according to a lightning trip-out rate control range, judging the cloud-to-ground lightning high-risk of the line corridor.By means of the method, organic combination of the cloud-to-ground lightning density, topographic position indexes and line lightning stroke historical data is achieved, the defect that the topographic features are not considered in traditional methods is made up, and the judgment result is more objective and scientific.
Description
Technical field
The present invention relates to status of electric power evaluation and diagnostic techniques field, particularly to a kind of method judging the power circuit corridor high-risk section of Ground flash.
Background technology
In recent years, electrical network 220kV and above overhead transmission line increase quickly, along with electrical network popularization, radiation areas expansion, in power transmission and transforming equipment O&M, overhead transmission line has become the weakness of operation of power networks, and transmission line of electricity landform along the line, landforms are different, big by natural environment influence, wherein to suffer thunderbolt the most general, the impact that circuit is run by damage to crops caused by thunder constantly strengthens, the safe and stable operation of serious harm electrical network.When electrical network scale is less, adopt unified lightning protection measures simple and direct feasible；After electrical network scale constantly expands, if ignoring the diversity of region thunder activity law, whole power transmission line corridor not being differentiated between the order of importance and emergency, adopting uniform lightning protection measures completely, can cause that line thunder protection improvement cost is very high, and actual effect may not be desirable.Simultaneously; newly-built circuit is often short of the full and accurate data in circuit is struck by lightning impact etc. by line corridor thunder activity law, topography and landform character in the design process; make circuit designer be difficult to rationally select circuit tower, shielding angle etc., cause the thunderbolt risk that circuit design link originally can be evaded to leave over again and run link to circuit.Simultaneously along with a large amount of transmission line construction lands used, government is promoted to be concentrated to the remote mountain area that economic activity is rare by high voltage power transmission passage, it is of common occurrence that the situation with a piece of chain of mountains gully is crossed in several times newly-built high-tension line corridors simultaneously, so cause the risk increase that ultra-high-tension power transmission line is subject to damage to crops caused by thunder invasion and attack simultaneously several times, once trip simultaneously, the stabilization of power grids can be caused and have a strong impact on.Under this background, according to region lightning monitoring data for many years, a kind of Combining with terrain parameter of research, further investigation area with more lightning activities characteristic distributions, technical method objective, the clearly judgement high-risk section of power transmission line corridor Ground flash, thunder And Lightning Preventive Measures is proposed targetedly, it appears necessary and urgent.
Summary of the invention
A kind of method that it is an object of the invention to provide Combining with terrain parameter decision high-risk section of line corridor Ground flash, to solve the existing high-risk section technical method of judgement line corridor Ground flash, simple survey region Ground flash is distributed, do not consider topography and landform character, cause that the efficiency analyzing Ground flash parameter distribution and line corridor thunderbolt situation is on the low side, fineness is not high, the problem that the practical value of engineer applied is relatively low.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of method of Combining with terrain parameter decision high-risk section of line corridor Ground flash, comprises the following steps:
1) Monitoring Data, according to the lightning monitoring system of institute's survey region, simulates Thunderstorm Day T by formula 1dWith CG lightning density NgRelation, find out be more than or equal to NgThe power transmission line corridor section of threshold value Y, as the object of Ground flash risk assessment:
In formula: α and β is coefficient, undertaken what mathematical method matching obtained by lightning monitoring data；
2), combined circuit thunderbolt historical failure data storehouse, carry out circuit damage to crops caused by thunder risk Preliminary screening, for NgY time/(km of <2A) track section in region, if but actually occurred lightning fault in running in the past, will extract the object as Ground flash risk assessment by this transmission line of electricity section；
3), using the 1st) step and the 2nd) the transmission line of electricity section of the object as Ground flash risk assessment selected of step, carry out topographical position index TPI to analyze, according to TPI threshold value corresponding to different terrain, further on gentle slope, the track section on abrupt slope and mountain top filter out shaft tower and the span of TPI >-0.5SD；SD characterizes the standard deviation value of neighborhood pixel elevation；
4), according to step 3) shaft tower selected and span section, carry out tripping rate with lightning strike calculating；
5), step 3 is determined) gap of the shaft tower trip-out rate selected and target trip-out rate；Gap grade is section residing for high risk shaft tower is the high-risk section of line corridor Ground flash.
Further, step 1) in threshold value Y be according to TdWhen being 30, the N calculatedgValue.
Further, step 3) in the difference of TPI characterization research impact point and its neighborhood elevation meansigma methods:
In formula:
H impact point elevation；
The meansigma methods of neighborhood elevation.
Further, step 4) in tripping rate with lightning strike calculate by the following method:
1) counterattack trip-out rate:
Every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of tripping operation number of times that lightning stroke rate causes:
In formula:
γ ground lightning strike density, secondary/km2Thunderstorm Day；
A equivalent line is subject to thunder width, m；
G hits bar rate；
η probability of sustained arc；
p1The amplitude of lightning current probability more than the lightning stroke rate horizontal I1 of resistance to thunder；
2) back flash-over rate:
Circuit risk of shielding failure is pa, every 100 kilometers of circuits, 40 Thunderstorm Days, year shielding number of times:
N=4 γ Apa(4)
If the probability that amplitude of lightning current exceedes shielding line lightning resisting level I2 is p2, then every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of the tripping operation number of times that thunderbolt wire causes, i.e. back flash-over rate:
n2=4 γ Apaηp2(5)
Total tripping rate with lightning strike is:
N=n1+n2=4 γ A η (gp1+pap2)(6)。
Further, step 5) in 1.5 (nb+nsfThe shaft tower of)≤n is excessive risk shaft tower；nbIt it is counterattack trip-out rate index；nsfIt it is back flash-over rate index.
Further, further comprising the steps of:
The Ground flash parameter distribution information of the monitoring of lightning monitoring system is fully combined with features of terrain, by geographical information platform, Ground flash Monitoring Data over the years is pressed frequency and intensity classification, adopt variable grid subdivision method statistical disposition lightning monitoring data, digital elevation model and remote sensing image are incorporated in Ground flash parameter distribution hum pattern, makes Ground flash parameter distribution result presentation on topography layer；Simultaneously by step 5) gap that calculates shows on topography layer according to grade；Described grade includes: low-risk, medium risk and excessive risk；Total tripping rate with lightning strike corresponding to low-risk is: 0.6 (nb+nsf)≤n≤1.0(nb+nsf)；Total tripping rate with lightning strike that medium risk is corresponding is: 1.0 (nb+nsf) < n < 1.5 (nb+nsf)；Total tripping rate with lightning strike corresponding to excessive risk is: 1.5 (nb+nsf)≤n；nbIt it is counterattack trip-out rate index；nsfIt it is back flash-over rate index.
Ground flash parameter distribution information is fully combined by the present invention with features of terrain, adopts CG lightning density, topographical position index, circuit lightning fault historical data three elements, the objective judgement high-risk section of line corridor Ground flash.
The method of the present invention a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash, comprises the following steps:
1, the Monitoring Data (more than at least 6 years) according to lightning monitoring system, simulates Thunderstorm Day T by formula 1dWith CG lightning density NgRelation, find out be more than or equal to NgThe power transmission line corridor section of threshold value Y, as the object of Ground flash risk assessment:
In formula: α and β is coefficient, being by mathematical method matching, this is obtained by lightning monitoring data.Generally taking Thunderstorm Day is 30, it is believed that the year Thunderstorm Day region lower than 30, infrequently, the probability that circuit is struck by lightning is very low for lightening activity, so threshold value Y is according to TdWhen being 30, the N calculatedgValue.
2, combined circuit thunderbolt historical failure data storehouse, carries out circuit damage to crops caused by thunder risk Preliminary screening, particularly pays close attention to NgY time/(km of <2A) track section in region, if but actually occurred lightning fault in running in the past, will extract the object as Ground flash risk assessment by this transmission line of electricity section.
The transmission line of electricity section of the object as Ground flash risk assessment 3, first two steps selected, carry out topographical position index TPI to analyze, according to the TPI threshold value that different terrain is corresponding, filter out shaft tower and the span of TPI >-0.5SD further, namely the track section on gentle slope, abrupt slope and mountain top is included, get rid of mountain valley and the lowest point, shielded by surrounding terrain, the track section that lightning strike probability is very low.
Wherein: the difference of TPI characterization research impact point and its neighborhood elevation meansigma methods:
In formula:
H impact point elevation；
The meansigma methods of neighborhood elevation.
SD characterizes the standard deviation value of neighborhood pixel elevation.
4, the shaft tower selected according to front 3 steps and span section, according to formula 3,4,5,6 and method calculated as below, carry out tripping rate with lightning strike calculating.
1) counterattack trip-out rate: in two kinds of situation, is that lightning current enters ground by lightning conducter near tower top and shaft tower through shaft tower, causes tower top current potential suddenly to raise, insulator arc-over in counterattack；Two is the lightning conducter in the middle part of thunderbolt shaft tower span.Tripping operation generally will not be caused because of the second situation.Counterattack trip-out rate is mainly determined by the first situation.
Every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of tripping operation number of times that lightning stroke rate causes:
In formula:
γ ground lightning strike density (secondary/km2Thunderstorm Day)；
A equivalent line is subject to thunder width (m)；
G hits bar rate；
η probability of sustained arc；
p1The amplitude of lightning current probability more than the lightning stroke rate horizontal I1 of resistance to thunder.
2) back flash-over rate:
Circuit risk of shielding failure is pa, every 100 kilometers of circuits, 40 Thunderstorm Days, year shielding number of times:
N=4 γ Apa(4)
If the probability that amplitude of lightning current exceedes shielding line lightning resisting level I2 is p2, then every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of the tripping operation number of times that thunderbolt wire causes, i.e. back flash-over rate:
n2=4 γ Apaηp2(5)
Total tripping rate with lightning strike is:
N=n1+n2=4 γ A η (gp1+pap2)(6)
5, pass through filtering out in the span section with certain damage to crops caused by thunder risk, the calculating of shaft tower trip-out rate step by step, specify that the gap of these shaft towers and target trip-out rate.Realize being controlled by lightning outage rate an appropriate scope, need to the shaft tower (grade is high risk shaft tower) differed greatly with target trip-out rate, take suitable thunder And Lightning Preventive Measures, different risk class is shown on the Ground flash figure that the 6th step merges.Table 1 is shaft tower thunderbolt risk grade classification.
The grade of table 1 shaft tower thunderbolt risk
| Sequence number | Grade | Risk divides |
| Ⅰ | Low-risk | 0.6(nb+nsf)≤n≤1.0(nb+nsf) |
| Ⅱ | Medium risk | 1.0(nb+nsf) < n < 1.5 (nb+nsf) |
| Ⅲ | Excessive risk | 1.5(nb+nsf)≤n |
Note: n is shaft tower tripping rate with lightning strike；nbIt it is counterattack trip-out rate index；nsfIt it is back flash-over rate index.
6, the Monitoring Data (Ground flash parameter distribution information) of lightning monitoring system can be fully combined by the present invention with features of terrain, by geographical information platform, Ground flash Monitoring Data over the years is pressed frequency and intensity classification, adopt variable grid subdivision method statistical disposition lightning monitoring data, digital elevation model and remote sensing image are incorporated in Ground flash parameter distribution hum pattern, makes Ground flash parameter distribution result presentation on topography layer.
Advantages of the present invention and beneficial effect are in that:
First, according to lightning monitoring system data, the method adopting Mathematical Fitting, have found the Thunderstorm Day T in certain areadWith CG lightning density NgRelation.
Second, combined circuit thunderbolt historical failure data storehouse, special concern is lower than NgThreshold value, but in running, actually occurred the line corridor of lightning fault in the past, mathematical model is combined closely with running practical situation, reduces the gap of Theoretical Calculation and actual condition.
3rd, calculated by modeling and simulation, have studied the different topographic characteristics impact on transmission line lightning stroke transient process, and then propose the TPI threshold value that different topographic characteristics is corresponding, make terrain parameter and CG lightning density be combined into possibility.
4th, propose to combine Ground flash parameter distribution information with features of terrain, by geographical information platform, Ground flash Monitoring Data over the years is pressed frequency and intensity classification, digital elevation model and remote sensing image are incorporated in Ground flash parameter distribution hum pattern, makes Ground flash with features of terrain fully in conjunction with display.
5th, CG lightning density, topographical position index, circuit lightning fault historical data three elements are fully combined, overcomes the shortcoming that traditional method does not consider features of terrain, it is determined that result is more objective, science.
Accompanying drawing explanation
Fig. 1 is the flow chart of the inventive method；
Fig. 2 is example calculations tripping rate with lightning strike scattergram.
Detailed description of the invention
Dodge high-risk section below in conjunction with somewhere 330kV above power transmission line corridor ground cloud and judge example, the present invention is described in further detail.
The method of the present invention a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash, comprises the following steps:
(1) according to about 2,600,000 3 stations of 2005 to 2012 somewhere lightning monitoring systems and above location data, and about 110,000 thunder and lightning manual records of 1998 to 2012 this area's weather stations, the Thunderstorm Day T to this area's electrical networkdWith CG lightning density NgRelation be fitted, obtain
TdBy 30 Thunderstorm Days, Ng=2.58 times/(km2A), sort out circuit and pass through Ng>=2.5 times/(km2A) section in region carries out damage to crops caused by thunder risk assessment, namely to 2.5 times/(km of Ng <2A) track section in region, not as the emphasis of damage to crops caused by thunder risk assessment.Year Thunderstorm Day region lower than 30, infrequently, the probability that circuit is struck by lightning is very low for lightening activity.
(2) combined circuit thunderbolt historical failure data storehouse, carries out circuit damage to crops caused by thunder risk Preliminary screening；Particularly pay close attention to 2.5 times/(km of Ng <2A) track section in region, if but actually occurred lightning fault in running in the past, will extract the object as Ground flash risk assessment by this transmission line of electricity section.
(3) the transmission line of electricity section of the object as Ground flash risk assessment first two steps selected, carry out topographical position index TPI to analyze, according to the TPI threshold value that different terrain is corresponding, filter out shaft tower and the span of TPI >-0.5SD further；
Wherein: the difference of TPI characterization research impact point and its neighborhood elevation meansigma methods:
In formula:
H impact point elevation；
The meansigma methods of neighborhood elevation.
Carry out the judgement of following step for the one section of railroad section filtered out, choose No. 140 to No. 190 these sections of shaft tower of 330kV gold toothed oak line, the shaft tower of this section is carried out risk judgement step by step.
(4) according to the computational methods of formula 3,4,5,6, tripping rate with lightning strike calculating is carried out, as shown in Figure 2.
Every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of tripping operation number of times that lightning stroke rate causes:
In formula:
γ ground lightning strike density (secondary/km2Thunderstorm Day)；
A equivalent line is subject to thunder width (m)；
G hits bar rate；
η probability of sustained arc；
p1The amplitude of lightning current probability more than the lightning stroke rate horizontal I1 of resistance to thunder.
2) back flash-over rate:
Circuit risk of shielding failure is pa, every 100 kilometers of circuits, 40 Thunderstorm Days, year shielding number of times:
N=4 γ Apa(4)
If the probability that amplitude of lightning current exceedes shielding line lightning resisting level I2 is p2, then every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of the tripping operation number of times that thunderbolt wire causes, i.e. back flash-over rate:
n2=4 γ Apaηp2(5)
Total tripping rate with lightning strike is:
N=n1+n2=4 γ A η (gp1+pap2)(6)
(5) if it is 0.2 times/year hundred kilometers that tripping rate with lightning strike controls target, then the thunderbolt excessive risk shaft tower of transformation it is badly in need of in section, n >=1.5 × 0.2=0.3 (times/year hundred kilometers), there are 3 bases.
Claims (6)
1. the method for the Combining with terrain parameter decision high-risk section of line corridor Ground flash, it is characterised in that comprise the following steps:
1) Monitoring Data, according to the lightning monitoring system of institute's survey region, simulates Thunderstorm Day T by formula 1dWith CG lightning density NgRelation, find out be more than or equal to NgThe power transmission line corridor section of threshold value Y, as the object of Ground flash risk assessment:
In formula: α and β is coefficient；
2), combined circuit thunderbolt historical failure data storehouse, carry out circuit damage to crops caused by thunder risk Preliminary screening, for NgY time/(km of <2A) track section in region, if but actually occurred lightning fault in running in the past, will extract the object as Ground flash risk assessment by this transmission line of electricity section；
3), using the 1st) step and the 2nd) the transmission line of electricity section of the object as Ground flash risk assessment selected of step, carry out topographical position index TPI to analyze, according to TPI threshold value corresponding to different terrain, further on gentle slope, the track section on abrupt slope and mountain top filter out shaft tower and the span of TPI >-0.5SD；SD characterizes the standard deviation value of neighborhood pixel elevation；
4), according to step 3) shaft tower selected and span section, carry out tripping rate with lightning strike calculating；
5), step 3 is determined) gap of the shaft tower trip-out rate selected and target trip-out rate；Gap grade is section residing for high risk shaft tower is the high-risk section of line corridor Ground flash.
2. the method for a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash according to claim 1, it is characterised in that step 1) in threshold value Y be according to TdWhen being 30, the N calculatedgValue.
3. the method for a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash according to claim 1, it is characterised in that step 3) in the difference of TPI characterization research impact point and its neighborhood elevation meansigma methods:
In formula:
H impact point elevation；
The meansigma methods of neighborhood elevation.
4. the method for a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash according to claim 1, it is characterised in that step 4) in tripping rate with lightning strike calculate by the following method:
1) counterattack trip-out rate:
Every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of tripping operation number of times that lightning stroke rate causes:
In formula:
γ ground lightning strike density, secondary/km2Thunderstorm Day；
A equivalent line is subject to thunder width, m；
G hits bar rate；
η probability of sustained arc；
p1The amplitude of lightning current probability more than the lightning stroke rate horizontal I1 of resistance to thunder；
2) back flash-over rate:
Circuit risk of shielding failure is pa, every 100 kilometers of circuits, 40 Thunderstorm Days, year shielding number of times:
N=4 γ Apa(4)
If the probability that amplitude of lightning current exceedes shielding line lightning resisting level I2 is p2, then every 100 kilometers of circuits, 40 Thunderstorm Days, every year because of the tripping operation number of times that thunderbolt wire causes, i.e. back flash-over rate:
n2=4 γ Apaηp2(5)
Total tripping rate with lightning strike is:
N=n1+n2=4 γ A η (gp1+pap2)(6)。
5. the method for a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash according to claim 4, it is characterised in that step 5) in 1.5 (nb+nsfThe shaft tower of)≤n is excessive risk shaft tower；nbIt it is counterattack trip-out rate index；nsfIt it is back flash-over rate index.
6. the method for a kind of Combining with terrain parameter decision high-risk section of line corridor Ground flash according to claim 4, it is characterised in that further comprising the steps of:
The Ground flash parameter distribution information of the monitoring of lightning monitoring system is fully combined with features of terrain, by geographical information platform, Ground flash Monitoring Data over the years is pressed frequency and intensity classification, adopt variable grid subdivision method statistical disposition lightning monitoring data, digital elevation model and remote sensing image are incorporated in Ground flash parameter distribution hum pattern, makes Ground flash parameter distribution result presentation on topography layer；Simultaneously by step 5) gap that calculates shows on topography layer according to grade；Described grade includes: low-risk, medium risk and excessive risk；Total tripping rate with lightning strike corresponding to low-risk is: 0.6 (nb+nsf)≤n≤1.0(nb+nsf)；Total tripping rate with lightning strike that medium risk is corresponding is: 1.0 (nb+nsf) < n < 1.5 (nb+nsf)；Total tripping rate with lightning strike corresponding to excessive risk is: 1.5 (nb+nsf)≤n；nbIt it is counterattack trip-out rate index；nsfIt it is back flash-over rate index.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108899883A (en) * | 2018-07-09 | 2018-11-27 | 安徽硕日光电科技有限公司 | A kind of intelligent lightning protecting regulator control system based on terrain analysis |
| CN108921370A (en) * | 2018-05-15 | 2018-11-30 | 陕西省地方电力（集团）有限公司 | A kind of appraisal procedure and system of transmission line of electricity section damage to crops caused by thunder risk |
| CN109063329A (en) * | 2018-08-01 | 2018-12-21 | 长沙理工大学 | Consider that the transmission tower windage yaw design wind speed of thunder and lightning wind speed Joint Distribution determines method |
| CN109064057A (en) * | 2018-09-05 | 2018-12-21 | 国网湖北省电力有限公司电力科学研究院 | A kind of methods of risk assessment of distribution line lightning parameter relative value |
| CN113010559A (en) * | 2021-03-26 | 2021-06-22 | 云南电网有限责任公司电力科学研究院 | Association mining method for micro-terrain and lightning damage characteristic parameters of power transmission corridor area |
| CN113238099A (en) * | 2021-06-02 | 2021-08-10 | 湖北省防雷中心 | Lightning positioning system-based ground lightning grade division method |
| CN116579617A (en) * | 2023-07-12 | 2023-08-11 | 国网山东省电力公司邹城市供电公司 | Power grid risk assessment method and system |
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