CN113937740A - Distribution line fault identification and disposal method and system considering forest fire risk - Google Patents

Distribution line fault identification and disposal method and system considering forest fire risk Download PDF

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Publication number
CN113937740A
CN113937740A CN202111558984.1A CN202111558984A CN113937740A CN 113937740 A CN113937740 A CN 113937740A CN 202111558984 A CN202111558984 A CN 202111558984A CN 113937740 A CN113937740 A CN 113937740A
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distribution line
fault
forest fire
risk
condition
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CN113937740B (en
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李世龙
范松海
龙呈
高艺文
苏学能
方玉
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Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/027—Details with automatic disconnection after a predetermined time
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/06—Details with automatic reconnection

Abstract

The invention discloses a distribution line fault identification and disposal method and system considering forest fire risks, wherein the method comprises the following steps: acquiring the environment and real-time meteorological data along the power distribution line, and calculating the real-time forest fire weather index along the power distribution line according to the environment and the real-time meteorological data along the power distribution line; measuring the electric quantity at two ends of the distribution line, wherein the electric quantity at two ends of the distribution line is three-phase current and zero-sequence current phasor; respectively identifying faults of different distribution line fault types according to the electric quantities at two ends of the distribution line and the forest fire risk meteorological index; according to the forest fire risk meteorological index, distribution line forest fire risks are divided into different levels, and distribution line faults are handled in a differentiated mode under different risk levels. According to the method, the mountain fire risk of the distribution line is fully considered, different types of faults are correspondingly identified and treated, and the fault identification efficiency is high; the urgent need of distribution line mountain fire prevention considering dynamic risk of mountain fire in actual production is met.

Description

Distribution line fault identification and disposal method and system considering forest fire risk
Technical Field
The invention relates to the field of power systems and automation thereof, in particular to a distribution line fault identification and disposal method and system considering forest fire risks.
Background
The distribution lines is the last link of carrying the electric energy to thousands of households, and to the distribution lines that passes through forest zone and grassland, the vast majority is not done insulation processing, because the circuit height is lower, when vegetation height is too high, easy and distribution lines contact, and then form electric arc and ignite the naked light, very easily cause the mountain fire calamity under the dry and great condition of wind speed of weather. In the existing distribution line protection technology, in the process of criterion design, metallic grounding or short-circuit faults are mainly considered, but the distribution line is in contact with vegetation along the line, and the electrical quantity change caused by electric arcs formed by contact of the distribution line and the vegetation is weak due to the fact that the contact resistance of the vegetation is high, and the distribution line is difficult to reliably identify by the existing protection technology. In the season of high mountain fire, the distribution line fault is always a great hidden danger of causing mountain fire. On the other hand, along with the dynamic change of the mountain fire risk, the handling strategy of the fault should be correspondingly adjusted, so that the reduction of the power supply reliability caused by mountain fire prevention is avoided.
Disclosure of Invention
The invention aims to solve the technical problems that the existing distribution line fault identification mainly considers metallic grounding or short-circuit faults, does not consider the mountain fire risk of the distribution line, causes the reduction of power supply reliability caused by mountain fire prevention, and can not respectively identify and dispose according to different fault types.
The invention aims to provide a distribution line fault identification and handling method and system considering forest fire risks, aiming at the forest fire prevention requirement of a high forest fire danger distribution line passing through forest areas and grasslands, the method utilizes the line measurement characteristic electric quantity vector after the distribution line has a ground fault as a judgment basis, and combines the evaluation perception result of the environment along the distribution line to identify and handle the distribution line fault, aiming at filling the blank of research in the field and meeting the urgent requirement of distribution line forest fire prevention considering the dynamic forest fire risk in actual production.
The invention is realized by the following technical scheme:
in a first aspect, the invention provides a distribution line fault identification handling method considering forest fire risk, which includes:
acquiring the environment along the power distribution line and real-time meteorological data, and calculating the real-time forest fire danger meteorological index along the power distribution line according to the environment along the power distribution line and the real-time meteorological data;
measuring electric quantities at two ends of a distribution line, wherein the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors; respectively identifying the faults of different distribution line fault types according to the electric quantities at the two ends of the distribution line and the forest fire risk meteorological index; and
according to the forest fire danger meteorological index, dividing the distribution line forest fire risks into different grades, and performing differential treatment on the distribution line faults under different risk grades.
Further, the environment and real-time meteorological data along the distribution line comprise daily average wind speed v (m/s), daily maximum temperature T (DEG C), and daily minimum relative humidity
Figure 269285DEST_PATH_IMAGE002
(%), combustible humidity
Figure 385621DEST_PATH_IMAGE004
(%), consecutive days without rainfall D (days).
Further, the calculation formula of the forest fire meteorological index is as follows:
Figure 512977DEST_PATH_IMAGE006
Figure 881642DEST_PATH_IMAGE008
Figure 119856DEST_PATH_IMAGE010
Figure 421525DEST_PATH_IMAGE012
in the formula (I), the compound is shown in the specification,
Figure 719782DEST_PATH_IMAGE014
the forest fire hazard meteorological index is obtained;
Figure 310163DEST_PATH_IMAGE016
in order to obtain the result of the first intermediate calculation,
Figure 679965DEST_PATH_IMAGE018
is a second intermediate calculation result;
Figure 508244DEST_PATH_IMAGE020
is a distribution line wind speed fire risk index value for calculating a first intermediate result, wherein
Figure 652436DEST_PATH_IMAGE022
A corner mark representing the wind speed is shown,Vrepresenting wind speed;
Figure 198955DEST_PATH_IMAGE024
is a distribution line temperature fire hazard indicator value for calculating a first intermediate result, whereintIn order to indicate the angle of the temperature,Tto measure the temperature;
Figure 169185DEST_PATH_IMAGE026
to be used for calculatingDistribution line daily minimum relative humidity mountain fire risk indicator of a first intermediate result, whereinFTo represent a corner mark for minimum humidity of the day,
Figure 851970DEST_PATH_IMAGE028
is a daily minimum humidity measurement;
Figure 819926DEST_PATH_IMAGE030
for the distribution line fire risk indicator of consecutive days without rainfall for calculating the first intermediate result, whereinmA corner mark indicating the number of days of continuous no rainfall,Mrepresents the number of days of continuous no rainfall;
Figure 853741DEST_PATH_IMAGE032
for calculating a second intermediate result of the index value of the wind speed and fire risk of the distribution line, wherein
Figure 768607DEST_PATH_IMAGE022
A corner mark representing the wind speed is shown,Vrepresenting wind speed;
Figure 633795DEST_PATH_IMAGE034
is a distribution line temperature fire hazard indicator value for calculating a second intermediate result, whereintIn order to indicate the angle of the temperature,Tto measure the temperature;
Figure 710336DEST_PATH_IMAGE036
for calculating a distribution line daily minimum relative humidity mountain fire risk indicator for a second intermediate result, whereinFTo represent a corner mark for the minimum daily relative humidity,
Figure 231447DEST_PATH_IMAGE038
daily minimum relative humidity;
Figure 418846DEST_PATH_IMAGE040
for the distribution line fire risk indicator of consecutive days without rainfall for calculating the second intermediate result, whereinmA corner mark indicating the number of days of continuous no rainfall,Mrepresents the number of days of continuous no rainfall;
Figure 404119DEST_PATH_IMAGE042
the distribution line fire risk indexes corresponding to the meteorological and environmental data;
Figure 789577DEST_PATH_IMAGE044
correcting the distribution line fire risk indexes corresponding to the meteorological and environmental data;
Figure 797984DEST_PATH_IMAGE046
is a combustible humidity measurement; a and B are weight coefficients respectively;
Figure 54653DEST_PATH_IMAGE048
the precipitation correction coefficient is obtained;
Figure 894433DEST_PATH_IMAGE050
and the surface combustible correction coefficient is obtained.
Furthermore, the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors, including a head-end three-phase current and zero-sequence current phasor and a tail-end three-phase current phasor; wherein, the first-end three-phase current and the zero-sequence current phasor are respectively
Figure 516038DEST_PATH_IMAGE052
The phase quantities of the three-phase current at the tail end are respectively
Figure 808479DEST_PATH_IMAGE054
(ii) a The zero sequence current is the phasor sum of the three-phase current.
Further, the fault identification of different distribution line fault types is respectively carried out, including carrying out distribution line three-phase short circuit fault identification, carrying out distribution line two-phase short circuit ungrounded fault identification, carrying out distribution line two-phase short circuit grounded fault identification and carrying out distribution line single-phase grounded fault identification.
Further, the criterion for identifying the three-phase short-circuit fault of the distribution line is as follows: when the relational expression of the first condition, the second condition and the third condition is simultaneously satisfied, the three-phase short-circuit fault in the distribution line can be judged; wherein the content of the first and second substances,
the first condition is that:
Figure 603260DEST_PATH_IMAGE056
the second condition is that:
Figure 500809DEST_PATH_IMAGE058
a third condition:
Figure 81264DEST_PATH_IMAGE060
in the formula (I), the compound is shown in the specification,
Figure 64264DEST_PATH_IMAGE062
the criterion action quantity is identified for the fault of the phase A,
Figure 538101DEST_PATH_IMAGE064
judging the braking quantity for the fault of the phase A;
Figure 24578DEST_PATH_IMAGE066
the criterion action quantity is identified for the fault of phase B,
Figure 112619DEST_PATH_IMAGE068
judging the braking amount for the fault of the B phase;
Figure 582915DEST_PATH_IMAGE070
the criterion action quantity is identified for the fault of the C phase,
Figure 719498DEST_PATH_IMAGE072
judging the braking amount for the fault of the C phase;
Figure 60481DEST_PATH_IMAGE074
judging a mountain fire risk factor for fault identification;
Figure 319424DEST_PATH_IMAGE076
the first-end A-phase current phasor,
Figure 8507DEST_PATH_IMAGE078
is the phasor of the phase B current at the head end,
Figure 948781DEST_PATH_IMAGE080
the first-end phase C current phasor is obtained,
Figure 472166DEST_PATH_IMAGE082
for the end a-phase current phasor,
Figure 839693DEST_PATH_IMAGE084
for the end phase B current phasor,
Figure DEST_PATH_IMAGE086
the terminal C-phase current phasor.
Further, the criterion for identifying the two-phase short circuit ungrounded fault of the distribution line is as follows: when the relationship of the fourth condition is satisfied, and only two relational expressions in the first condition, the second condition and the third condition are satisfied, the two phases which satisfy the relationship can be judged to have a short-circuit ungrounded fault; wherein the content of the first and second substances,
a fourth condition:
Figure DEST_PATH_IMAGE088
in the formula (I), the compound is shown in the specification,
Figure DEST_PATH_IMAGE090
is the zero-sequence current phasor at the head end,
Figure DEST_PATH_IMAGE092
is the terminal zero sequence current phasor.
Further, the criterion for identifying the two-phase short circuit grounding fault of the distribution line is as follows: when the relationship of the fifth condition is satisfied, and only two relational expressions in the first condition, the second condition and the third condition are satisfied, the two phases which satisfy the relationship can be judged to have a short-circuit ground fault; wherein the content of the first and second substances,
a fifth condition:
Figure DEST_PATH_IMAGE094
in the formula (I), the compound is shown in the specification,
Figure 913610DEST_PATH_IMAGE090
is the zero-sequence current phasor at the head end,
Figure 454312DEST_PATH_IMAGE092
is the terminal zero sequence current phasor.
Further, the criterion for identifying the single-phase earth fault of the distribution line is as follows: when the fifth condition relation is satisfied, and one or only one of the first condition, the second condition and the third condition is satisfied, it can be determined that a short-circuit ground fault occurs in one phase satisfying the relation.
Further, dividing the mountain fire risk of the distribution line into different grades according to the forest fire risk meteorological index, and performing differential treatment on the distribution line fault under different risk grades; the method specifically comprises the following steps:
according to the forest fire risk meteorological index, dividing the distribution line forest fire risk into three levels: primary risk, secondary risk, and tertiary risk; the forest fire hazard meteorological index under the first-level risk is 0-36, the risk degree is low risk, and the flammability degree is difficult to burn; the forest fire hazard meteorological index under the secondary risk is 37-71, the danger degree is medium danger, and the flammability degree is easy to burn; the forest fire hazard meteorological index under the three-level risk is 72-100, the danger degree is high danger, and the flammability degree is extremely easy to burn;
when the distribution line fault occurs in the condition of a first-level risk level, setting a delay for the fault line, and if the fault disappears in the delay, not cutting the fault line; if the fault does not disappear in the time delay, the fault line is cut off; the upper and lower switches can set time level difference; if the fault line is cut off, carrying out reclosing operation, and if the reclosing is successful, restoring the normal operation of the line; if the reclosing fails, the fault line is cut off again;
when the distribution line fault occurs in the condition of secondary risk level, setting a delay for the fault line, and if the fault disappears in the delay, the fault line does not need to be cut; if the fault does not disappear in the time delay, the fault line is cut off; the upper and lower switches do not set time level difference, and any one of the switches can remove the fault line after recognizing the fault; reclosing operation is not carried out after the fault line is cut off;
when the fault of the distribution line occurs under the condition of three-level risk grade, the switch cuts off the fault line without setting delay and grade difference, the principle of speed priority is followed, and the fault line is not reclosed after being cut off.
In a second aspect, the present invention further provides a distribution line fault identification handling system considering a mountain fire risk, which supports the distribution line fault identification handling method considering a mountain fire risk, and the system includes:
the meteorological data acquisition unit is used for acquiring the environment along the distribution line and real-time meteorological data;
the forest fire meteorological index calculating unit is used for calculating a real-time forest fire meteorological index along the power distribution line according to the environment along the power distribution line and the real-time meteorological data;
the power distribution line electric quantity measuring unit is used for measuring electric quantities at two ends of the power distribution line; the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors;
the distribution line fault identification unit is used for respectively identifying faults of different distribution line fault types according to the electric quantities at two ends of the distribution line and the forest fire risk meteorological index;
and the distribution line fault handling unit is used for dividing the forest fire risk of the distribution line into different grades according to the forest fire risk meteorological index, and performing differential handling on the distribution line fault under different risk grades.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention relates to a distribution line fault identification and handling method and system considering forest fire risks, aiming at the forest fire prevention requirement of a high forest fire danger distribution line passing through forest areas and grasslands, the method and system disclosed by the invention utilize the vector sum of line measurement characteristic electric quantity after the distribution line has a ground fault as a judgment basis, and simultaneously combine the evaluation sensing result of the environment along the distribution line to respectively identify and handle the faults of the distribution lines of different types, and the fault identification efficiency is high. Aims to fill the blank of research in the field and meet the urgent need of distribution line mountain fire prevention considering dynamic mountain fire risks in actual production.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a flowchart of a distribution line fault identification handling method considering mountain fire risk according to the present invention.
Fig. 2 is a structural diagram of a distribution line fault identification and handling system considering the risk of mountain fire according to the present invention.
Fig. 3 is a schematic diagram of measuring the electrical quantity of the distribution line according to the present invention.
Fig. 4 is a schematic diagram of the analysis of the fault identification characteristics of the criterion provided by the invention.
Fig. 5 is a zero sequence current variation graph after the two-phase short circuit ungrounded fault according to the present invention.
Fig. 6 is a graph of the change of zero sequence current after the two-phase short-circuit ground fault according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in fig. 1, the distribution line fault identification handling method considering the mountain fire risk of the present invention includes:
step 1, acquiring the environment and real-time meteorological data along a power distribution line, and calculating the real-time forest fire hazard meteorological index along the power distribution line according to the environment and the real-time meteorological data along the power distribution line;
specifically, the environment and real-time meteorological data along the distribution line comprise daily average wind speed v (m/s) and daily average wind speedMaximum temperature T (DEG C), minimum daily relative humidity
Figure 35466DEST_PATH_IMAGE002
(%), combustible humidity
Figure 839474DEST_PATH_IMAGE004
(%), consecutive days without rainfall D (days).
Specifically, the calculation formula of the forest fire meteorological index is as follows:
Figure 240500DEST_PATH_IMAGE006
Figure 991418DEST_PATH_IMAGE008
Figure 286133DEST_PATH_IMAGE010
Figure 933146DEST_PATH_IMAGE012
in the formula (I), the compound is shown in the specification,
Figure 87047DEST_PATH_IMAGE014
the forest fire hazard meteorological index is obtained;
Figure 907236DEST_PATH_IMAGE016
in order to obtain the result of the first intermediate calculation,
Figure 259720DEST_PATH_IMAGE018
is a second intermediate calculation result;
Figure DEST_PATH_IMAGE095
is a distribution line wind speed fire risk index value for calculating a first intermediate result, wherein
Figure 340284DEST_PATH_IMAGE022
A corner mark representing the wind speed is shown,Vrepresenting wind speed;
Figure DEST_PATH_IMAGE096
is a distribution line temperature fire hazard indicator value for calculating a first intermediate result, whereintIn order to indicate the angle of the temperature,Tto measure the temperature;
Figure DEST_PATH_IMAGE097
for calculating a distribution line daily minimum relative humidity mountain fire risk indicator for a first intermediate result, whereinFTo represent a corner mark for minimum humidity of the day,
Figure 653584DEST_PATH_IMAGE028
is a daily minimum humidity measurement;
Figure 11884DEST_PATH_IMAGE030
for the distribution line fire risk indicator of consecutive days without rainfall for calculating the first intermediate result, whereinmA corner mark indicating the number of days of continuous no rainfall,Mrepresents the number of days of continuous no rainfall;
Figure 687716DEST_PATH_IMAGE032
for calculating a second intermediate result of the index value of the wind speed and fire risk of the distribution line, wherein
Figure 535587DEST_PATH_IMAGE022
A corner mark representing the wind speed is shown,Vrepresenting wind speed;
Figure 398501DEST_PATH_IMAGE034
is a distribution line temperature fire hazard indicator value for calculating a second intermediate result, whereintIn order to indicate the angle of the temperature,Tto measure the temperature;
Figure DEST_PATH_IMAGE098
for calculating a distribution line daily minimum relative humidity mountain fire risk indicator for a second intermediate result, whereinFTo indicate the minimum dayThe angle of the relative humidity is marked with a corner mark,
Figure 560492DEST_PATH_IMAGE038
daily minimum relative humidity;
Figure DEST_PATH_IMAGE099
for the distribution line fire risk indicator of consecutive days without rainfall for calculating the second intermediate result, whereinmA corner mark indicating the number of days of continuous no rainfall,Mrepresents the number of days of continuous no rainfall;
Figure DEST_PATH_IMAGE100
the distribution line fire risk indexes corresponding to the meteorological and environmental data;
Figure DEST_PATH_IMAGE101
correcting the distribution line fire risk indexes corresponding to the meteorological and environmental data; the above values can be obtained by looking up tables in tables 1 and 2.
Figure 731028DEST_PATH_IMAGE046
Is a combustible humidity measurement; a and B are weight coefficients respectively; wherein A is 0.32 and B is 0.68.
Figure 953062DEST_PATH_IMAGE048
And for the precipitation correction coefficient, the value of precipitation on the day is 0, and the value of non-precipitation on the day is 1.
Figure 444217DEST_PATH_IMAGE050
And the correction coefficient of the surface combustibles is 0 if the surface of the distribution line channel is sand or rock along the line, and 1 if the surface of the distribution line is covered with combustible vegetation along the line.
According to
Figure 206637DEST_PATH_IMAGE014
Meter (2)And (4) calculating the real-time risk index along the distribution line by using a calculation formula, and quantitatively evaluating the mountain fire risk of the line according to the real number.
Table 1 distribution line fire risk index table
Figure DEST_PATH_IMAGE103
Table 2 distribution line correction fire risk index table
Figure DEST_PATH_IMAGE105
Step 2, measuring electric quantities at two ends of a distribution line, wherein the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors; respectively identifying the faults of different distribution line fault types according to the electric quantities at the two ends of the distribution line and the forest fire risk meteorological index;
considering the influence of mountain fire risks of different distribution lines, the criterion for constructing the fault identification of the distribution lines is as follows:
step 21, measuring three-phase current and zero-sequence current phasors at two ends of a distribution line;
as shown in FIG. 3, the first-end three-phase current and the zero-sequence current phasor are
Figure 526235DEST_PATH_IMAGE052
The phase quantities of the three-phase current at the tail end are respectively
Figure 653591DEST_PATH_IMAGE054
。
In fig. 3, the direction of the arrow is a predetermined positive direction, and if the actual current is the same as the positive direction, the current amplitude is positive, and if the actual current is opposite to the positive direction, the current amplitude is negative. The zero sequence current is the phasor sum of the three-phase current. Wherein:
Figure DEST_PATH_IMAGE107
Figure DEST_PATH_IMAGE109
step 22, respectively identifying faults of different distribution line fault types according to the electric quantities at the two ends of the distribution line and the forest fire risk meteorological index; the fault identification of different distribution line fault types is respectively carried out, including carrying out distribution line three-phase short circuit fault identification, carrying out distribution line two-phase short circuit ungrounded fault identification, carrying out distribution line two-phase short circuit grounded fault identification and carrying out distribution line single-phase grounded fault identification. And the four different types of fault identifications are in parallel relationship.
Specifically, the criterion for identifying the three-phase short-circuit fault of the distribution line is as follows: when the relational expression of the first condition, the second condition and the third condition is simultaneously satisfied, the three-phase short-circuit fault in the distribution line can be judged; wherein the content of the first and second substances,
the first condition is that:
Figure 694359DEST_PATH_IMAGE056
the second condition is that:
Figure 463732DEST_PATH_IMAGE058
a third condition:
Figure 499821DEST_PATH_IMAGE060
in the formula (I), the compound is shown in the specification,
Figure 63658DEST_PATH_IMAGE062
the criterion action quantity is identified for the fault of the phase A,
Figure 388460DEST_PATH_IMAGE064
judging the braking quantity for the fault of the phase A;
Figure 636557DEST_PATH_IMAGE066
the criterion action quantity is identified for the fault of phase B,
Figure 792732DEST_PATH_IMAGE068
judging the braking amount for the fault of the B phase;
Figure 527470DEST_PATH_IMAGE070
the criterion action quantity is identified for the fault of the C phase,
Figure 214934DEST_PATH_IMAGE072
judging the braking amount for the fault of the C phase;
Figure 388427DEST_PATH_IMAGE074
judging a mountain fire risk factor for fault identification;
Figure 195846DEST_PATH_IMAGE076
the first-end A-phase current phasor,
Figure 242430DEST_PATH_IMAGE078
is the phasor of the phase B current at the head end,
Figure 338562DEST_PATH_IMAGE080
the first-end phase C current phasor is obtained,
Figure 722270DEST_PATH_IMAGE082
for the end a-phase current phasor,
Figure 56300DEST_PATH_IMAGE084
for the end phase B current phasor,
Figure 129910DEST_PATH_IMAGE086
the terminal C-phase current phasor.
After a three-phase short-circuit fault occurs, the change curves of the action quantity and the braking quantity of one phase are shown in FIG. 4, and the 'action quantity' in FIG. 4 is the change curve of the fault identification action quantity before and after the fault occurs; the 'fault identification braking amount-without considering the forest fire risk' is the braking amount change before and after the fault occurs when the forest fire risk meteorological index is not considered; the 'fault identification braking amount-forest fire risk 10' is the braking amount change before and after the fault occurs when the forest fire risk meteorological index is considered as 10; the 'fault identification braking amount-forest fire risk 40' means that the braking amount changes before and after the fault occurs when the forest fire risk meteorological index is considered to be 40; the "failure recognition braking amount-forest fire risk 80" refers to the change of the braking amount before and after the occurrence of the failure when the forest fire risk meteorological index is considered as 80. As can be seen from fig. 4, before and after the occurrence of the failure, the operation amount significantly changes: before the fault occurs, the action quantity is smaller than the braking quantity, and the fault cannot be judged by mistake by the criterion of the invention; after the fault occurs, the action amount is larger than the braking amount, and the line fault can be accurately identified. Meanwhile, the method can be outstanding, after the mountain fire risk is considered, the sensitivity of fault identification is greatly improved, and the higher the mountain fire risk level is, the higher the sensitivity of fault identification is.
Specifically, the criterion for identifying the two-phase short-circuit ungrounded fault of the distribution line is as follows: when the relationship of the fourth condition is satisfied, and only two relational expressions in the first condition, the second condition and the third condition are satisfied, the two phases which satisfy the relationship can be judged to have a short-circuit ungrounded fault; wherein the content of the first and second substances,
the first condition is that:
Figure 713338DEST_PATH_IMAGE056
the second condition is that:
Figure 900737DEST_PATH_IMAGE058
a third condition:
Figure 823694DEST_PATH_IMAGE060
a fourth condition:
Figure 133453DEST_PATH_IMAGE088
in the formula (I), the compound is shown in the specification,
Figure 407439DEST_PATH_IMAGE090
is the zero-sequence current phasor at the head end,
Figure 398529DEST_PATH_IMAGE092
is a tail end zeroThe sequence current phasor.
When a two-phase short circuit ungrounded fault occurs, the zero sequence currents at the head end and the tail end of the distribution line change, as shown in fig. 5.
Specifically, the criterion for identifying the two-phase short circuit grounding fault of the distribution line is as follows: when the relationship of the fifth condition is satisfied, and only two relational expressions in the first condition, the second condition and the third condition are satisfied, the two phases which satisfy the relationship can be judged to have a short-circuit ground fault; wherein the content of the first and second substances,
the first condition is that:
Figure 238309DEST_PATH_IMAGE056
the second condition is that:
Figure 594335DEST_PATH_IMAGE058
a third condition:
Figure 886776DEST_PATH_IMAGE060
a fifth condition:
Figure 947136DEST_PATH_IMAGE094
in the formula (I), the compound is shown in the specification,
Figure 570316DEST_PATH_IMAGE090
is the zero-sequence current phasor at the head end,
Figure 300506DEST_PATH_IMAGE092
is the terminal zero sequence current phasor.
When a two-phase short circuit grounding fault occurs, the zero sequence currents at the first end and the last end of the line change, as shown in fig. 6.
Specifically, the criterion for identifying the single-phase earth fault of the distribution line is as follows: when the fifth condition relation is satisfied, and one or only one of the first condition, the second condition and the third condition is satisfied, it can be determined that a short-circuit ground fault occurs in one phase satisfying the relation.
And 3, dividing the forest fire risk of the distribution line into different grades according to the forest fire risk meteorological index, and performing differential treatment on the distribution line fault under different risk grades. The method specifically comprises the following steps:
step 31, dividing the forest fire risk of the distribution line into three levels according to the forest fire risk meteorological index: primary risk, secondary risk, and tertiary risk; the forest fire hazard meteorological index under the first-level risk is 0-36, the risk degree is low risk, and the flammability degree is difficult to burn; the forest fire hazard meteorological index under the secondary risk is 37-71, the danger degree is medium danger, and the flammability degree is easy to burn; the forest fire hazard meteorological index under the three-level risk is 72-100, the danger degree is high danger, and the flammability degree is extremely easy to burn; specifically, the risk level and the criterion are shown in table 3.
Table 3 Risk ratings table
Figure DEST_PATH_IMAGE111
Step 32, fault handling method under different risk levels
When the distribution line fault occurs under the condition of a first-level risk level, a delay is set for a cut-off line due to the low possibility of the occurrence of the mountain fire, and if the fault disappears in the delay, the fault line is not cut off; and if the fault does not disappear in the time delay, cutting off the fault line. The upper and lower switches can set time step difference, thereby reducing fault removal range, and eliminating circuit by the lower switch without the action of the upper switch. If the fault line is cut off, carrying out reclosing operation, and if the reclosing is successful, restoring the normal operation of the line; and if the reclosing fails, the fault line is cut off again.
When the distribution line fault occurs under the condition of secondary risk level, a delay is set for the fault line due to certain mountain fire risk, and if the fault disappears in the delay, the fault line does not need to be cut; and if the fault does not disappear in the time delay, cutting off the fault line. The upper and lower switches are not provided with time level difference, and fault lines can be cut off after any one level of switch identifies a fault. And after the fault line is cut off, reclosing operation is not carried out.
When the distribution line fault occurs under the condition of three-level risk level, due to the existence of extremely high mountain fire risk, the switch cuts off the fault line without setting time delay and level difference, the principle of speed priority is followed, and meanwhile, the reclosing is not performed after the fault line is cut off.
The tripping and closing strategies at different risks are shown in table 4.
Table 4 tripping and closing strategy table under different risks
Figure DEST_PATH_IMAGE113
The working principle is as follows: the method is based on the problems that the existing distribution line fault identification mainly considers metallic grounding or short-circuit faults, and does not consider the mountain fire risk of the distribution line, so that the power supply reliability is reduced due to mountain fire prevention, and the fault identification cannot respectively identify and deal with the faults according to different fault types. The invention designs a distribution line fault identification and handling method considering forest fire risks, aiming at the forest fire prevention requirement of a high forest fire danger distribution line passing through forest areas and grasslands, the method utilizes the line measurement characteristic electric quantity vector sum after the distribution line has a ground fault as a judgment basis, simultaneously combines the evaluation sensing result of the environment along the distribution line, respectively identifies and handles the distribution line faults of different types, and has high fault identification efficiency. Aims to fill the blank of research in the field and meet the urgent need of distribution line mountain fire prevention considering dynamic mountain fire risks in actual production.
Example 2
As shown in fig. 2, this embodiment is different from embodiment 1 in that this embodiment provides a distribution line fault identification and handling system considering a risk of forest fire, which supports the distribution line fault identification and handling method considering a risk of forest fire described in embodiment 1, and the system includes:
the meteorological data acquisition unit is used for acquiring the environment along the distribution line and real-time meteorological data;
the forest fire meteorological index calculating unit is used for calculating a real-time forest fire meteorological index along the power distribution line according to the environment along the power distribution line and the real-time meteorological data;
the power distribution line electric quantity measuring unit is used for measuring electric quantities at two ends of the power distribution line; the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors;
the distribution line fault identification unit is used for respectively identifying faults of different distribution line fault types according to the electric quantities at two ends of the distribution line and the forest fire risk meteorological index;
and the distribution line fault handling unit is used for dividing the forest fire risk of the distribution line into different grades according to the forest fire risk meteorological index, and performing differential handling on the distribution line fault under different risk grades.
The execution process of each unit may be executed according to the flow steps of the distribution line fault identification handling method considering the risk of forest fire in embodiment 1, and details are not repeated in this embodiment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (10)

1. A distribution line fault identification handling method considering forest fire risks is characterized by comprising the following steps:
acquiring the environment along the power distribution line and real-time meteorological data, and calculating the real-time forest fire danger meteorological index along the power distribution line according to the environment along the power distribution line and the real-time meteorological data;
measuring electric quantities at two ends of a distribution line, wherein the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors; respectively identifying the faults of different distribution line fault types according to the electric quantities at the two ends of the distribution line and the forest fire risk meteorological index; and
according to the forest fire danger meteorological index, dividing the distribution line forest fire risks into different grades, and performing differential treatment on the distribution line faults under different risk grades.
2. The method for fault identification and handling of the distribution line considering the forest fire risk as claimed in claim 1, wherein the distribution line along-line environment and real-time meteorological data comprise daily average wind speed, daily maximum temperature, daily minimum relative humidity, combustible humidity and continuous days without rainfall.
3. The distribution line fault identification handling method considering forest fire risk according to claim 1, wherein the forest fire risk meteorological index is calculated by the following formula:
Figure 808575DEST_PATH_IMAGE002
Figure 725715DEST_PATH_IMAGE004
Figure 242803DEST_PATH_IMAGE006
Figure 44537DEST_PATH_IMAGE008
in the formula (I), the compound is shown in the specification,
Figure 531013DEST_PATH_IMAGE010
the forest fire hazard meteorological index is obtained;
Figure 619055DEST_PATH_IMAGE012
in order to obtain the result of the first intermediate calculation,
Figure 823771DEST_PATH_IMAGE014
is a second intermediate calculation result;
Figure 225934DEST_PATH_IMAGE016
is a distribution line wind speed fire risk index value for calculating a first intermediate result, wherein
Figure 894812DEST_PATH_IMAGE018
A corner mark representing the wind speed is shown,Vrepresenting wind speed;
Figure 232384DEST_PATH_IMAGE020
is a distribution line temperature fire hazard indicator value for calculating a first intermediate result, whereintIn order to indicate the angle of the temperature,Tto measure the temperature;
Figure 986713DEST_PATH_IMAGE022
for calculating a distribution line daily minimum relative humidity mountain fire risk indicator for a first intermediate result, whereinFTo represent a corner mark for minimum humidity of the day,
Figure 661408DEST_PATH_IMAGE024
is a daily minimum humidity measurement;
Figure 385126DEST_PATH_IMAGE026
for the distribution line fire risk indicator of consecutive days without rainfall for calculating the first intermediate result, whereinmA corner mark indicating the number of days of continuous no rainfall,Mrepresents the number of days of continuous no rainfall;
Figure 690337DEST_PATH_IMAGE028
for calculating a second intermediate result of the index value of the wind speed and fire risk of the distribution line, wherein
Figure 135224DEST_PATH_IMAGE018
A corner mark representing the wind speed is shown,Vrepresenting wind speed;
Figure 410348DEST_PATH_IMAGE030
is a distribution line temperature fire hazard indicator value for calculating a second intermediate result, whereintIn order to indicate the angle of the temperature,Tto measure the temperature;
Figure 991502DEST_PATH_IMAGE032
for calculating a distribution line daily minimum relative humidity mountain fire risk indicator for a second intermediate result, whereinFTo represent a corner mark for the minimum daily relative humidity,
Figure 264351DEST_PATH_IMAGE034
daily minimum relative humidity;
Figure 196535DEST_PATH_IMAGE036
for the distribution line fire risk indicator of consecutive days without rainfall for calculating the second intermediate result, whereinmA corner mark indicating the number of days of continuous no rainfall,Mrepresents the number of days of continuous no rainfall;
Figure 275350DEST_PATH_IMAGE038
is a combustible humidity measurement;AandBare weight coefficients respectively;
Figure 866604DEST_PATH_IMAGE040
the precipitation correction coefficient is obtained;
Figure 575934DEST_PATH_IMAGE042
and the surface combustible correction coefficient is obtained.
4. The method of claim 1, wherein the identifying and handling of the distribution line faults considering the forest fire risk includes identifying three-phase short-circuit faults of the distribution line, identifying two-phase short-circuit ungrounded faults of the distribution line, identifying two-phase short-circuit grounded faults of the distribution line, and identifying single-phase grounded faults of the distribution line.
5. The distribution line fault identification handling method considering forest fire risk according to claim 4, wherein the criterion for identifying the three-phase short circuit fault of the distribution line is as follows: when the relational expression of the first condition, the second condition and the third condition is simultaneously met, judging that a three-phase short-circuit fault occurs in the distribution line; wherein the content of the first and second substances,
the first condition is that:
Figure 464256DEST_PATH_IMAGE044
the second condition is that:
Figure 346761DEST_PATH_IMAGE046
a third condition:
Figure 902507DEST_PATH_IMAGE048
in the formula (I), the compound is shown in the specification,
Figure 782739DEST_PATH_IMAGE050
the criterion action quantity is identified for the fault of the phase A,
Figure 158356DEST_PATH_IMAGE052
judging the braking quantity for the fault of the phase A;
Figure 578974DEST_PATH_IMAGE054
the criterion action quantity is identified for the fault of phase B,
Figure 254806DEST_PATH_IMAGE056
judging the braking amount for the fault of the B phase;
Figure 305938DEST_PATH_IMAGE058
fault identification criterion action for phase CThe amount of the compound (A) is,
Figure 431501DEST_PATH_IMAGE060
judging the braking amount for the fault of the C phase;
Figure 655809DEST_PATH_IMAGE062
judging a mountain fire risk factor for fault identification;
Figure 654989DEST_PATH_IMAGE064
the first-end A-phase current phasor,
Figure DEST_PATH_IMAGE066
is the phasor of the phase B current at the head end,
Figure DEST_PATH_IMAGE068
the first-end phase C current phasor is obtained,
Figure DEST_PATH_IMAGE070
for the end a-phase current phasor,
Figure DEST_PATH_IMAGE072
for the end phase B current phasor,
Figure DEST_PATH_IMAGE074
the terminal C-phase current phasor.
6. The distribution line fault identification handling method considering forest fire risk according to claim 5, wherein the criterion for identifying the two-phase short-circuit ungrounded fault of the distribution line is as follows: when the relationship of the fourth condition is satisfied, and only two relational expressions in the first condition, the second condition and the third condition are satisfied, judging that the two phases satisfying the relationship have short-circuit ungrounded fault; wherein the content of the first and second substances,
a fourth condition:
Figure DEST_PATH_IMAGE076
in the formula (I), the compound is shown in the specification,
Figure DEST_PATH_IMAGE078
is the zero-sequence current phasor at the head end,
Figure DEST_PATH_IMAGE080
is the terminal zero sequence current phasor.
7. The distribution line fault identification handling method considering forest fire risk according to claim 5, wherein the criterion for identifying the two-phase short circuit grounding fault of the distribution line is as follows: when the relationship of the fifth condition is satisfied, and only two relational expressions in the first condition, the second condition and the third condition are satisfied, judging that the two phases satisfying the relationship have a short-circuit ground fault; wherein the content of the first and second substances,
a fifth condition:
Figure DEST_PATH_IMAGE082
in the formula (I), the compound is shown in the specification,
Figure 115839DEST_PATH_IMAGE078
is the zero-sequence current phasor at the head end,
Figure 466049DEST_PATH_IMAGE080
is the terminal zero sequence current phasor.
8. The distribution line fault identification handling method considering forest fire risk according to claim 7, wherein the criterion for identifying the single-phase earth fault of the distribution line is as follows: and when the fifth condition relation is met and only one relation among the first condition, the second condition and the third condition is met, judging that one phase meeting the relation has a short-circuit grounding fault.
9. The method for identifying and disposing the distribution line fault considering the forest fire risk according to claim 1, wherein the distribution line forest fire risk is classified into different levels according to the forest fire risk meteorological index, and the distribution line fault is differentially disposed under the different risk levels; the method specifically comprises the following steps:
according to the forest fire risk meteorological index, dividing the distribution line forest fire risk into three levels: primary risk, secondary risk, and tertiary risk;
when the distribution line fault occurs in the condition of a first-level risk level, setting a delay for the fault line, and if the fault disappears in the delay, not cutting the fault line; if the fault does not disappear in the time delay, the fault line is cut off; the upper and lower switches set time level difference; if the fault line is cut off, carrying out reclosing operation, and if the reclosing is successful, restoring the normal operation of the line; if the reclosing fails, the fault line is cut off again;
when the distribution line fault occurs in the condition of secondary risk level, setting a delay for the fault line, and if the fault disappears in the delay, the fault line does not need to be cut; if the fault does not disappear in the time delay, the fault line is cut off; the upper and lower switches do not set time level difference, and any one of the switches can remove the fault line after recognizing the fault; reclosing operation is not carried out after the fault line is cut off;
when the fault of the distribution line occurs under the condition of three-level risk grade, the switch cuts off the fault line without setting delay and grade difference, the principle of speed priority is followed, and the fault line is not reclosed after being cut off.
10. A distribution line fault identification handling system considering a mountain fire risk, the system supporting a distribution line fault identification handling method considering a mountain fire risk according to any one of claims 1 to 9, the system comprising:
the meteorological data acquisition unit is used for acquiring the environment along the distribution line and real-time meteorological data;
the forest fire meteorological index calculating unit is used for calculating a real-time forest fire meteorological index along the power distribution line according to the environment along the power distribution line and the real-time meteorological data;
the power distribution line electric quantity measuring unit is used for measuring electric quantities at two ends of the power distribution line; the electric quantities at two ends of the distribution line are three-phase current and zero-sequence current phasors;
the distribution line fault identification unit is used for respectively identifying faults of different distribution line fault types according to the electric quantities at two ends of the distribution line and the forest fire risk meteorological index;
and the distribution line fault handling unit is used for dividing the forest fire risk of the distribution line into different grades according to the forest fire risk meteorological index, and performing differential handling on the distribution line fault under different risk grades.
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