CN111736034A - Power failure distribution transformer and topology analysis based power distribution network fault area rapid identification method - Google Patents
Power failure distribution transformer and topology analysis based power distribution network fault area rapid identification method Download PDFInfo
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- CN111736034A CN111736034A CN202010445029.6A CN202010445029A CN111736034A CN 111736034 A CN111736034 A CN 111736034A CN 202010445029 A CN202010445029 A CN 202010445029A CN 111736034 A CN111736034 A CN 111736034A
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 7
- 230000003247 decreasing effect Effects 0.000 claims description 3
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- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- 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
- G01R31/088—Aspects of digital computing
Abstract
The invention relates to a power distribution network fault area rapid identification method based on power failure distribution transformation and topology analysis, which comprises the following steps of randomly searching a power failure distribution transformation with a downward feeder outlet of a transformer substation as an initial power failure distribution transformation; the initial power failure distribution transformer is used for simultaneously carrying out forward and reverse searching, finding the switch closest to the upstream of the initial power failure distribution transformer as an initial switch, finding the switch closest to the downstream of the initial power failure distribution transformer as a stop switch; traversing all distribution transformers between the starting switch and the stopping switch, and calculating the power failure distribution transformer ratio X in a mathematical mode; drawing a position plane diagram, and marking the position of the power failure distribution transformation on the position plane diagram; dividing the total area of the position plan into a plurality of basic areas with equal areas; and sequencing all the basic areas, and recording and forming a repair sequencing table according to a sequencing result. The method has the effect of timely indicating the optimal path for repairing the power distribution network fault to the operator according to the power failure condition, thereby improving the maintenance efficiency.
Description
Technical Field
The invention relates to the technical field of power grid fault detection, in particular to a power distribution network fault area rapid identification method based on power failure distribution and transformation and topology analysis.
Background
The power distribution network is directly used as a power network facing users, the power distribution network is large in scale, various in equipment and complex in power supply environment, the power distribution network becomes a heavy disaster area with multiple faults, and according to statistics, more than 80% of power failure accidents are caused by power distribution network faults. Because the automatic coverage rate of the existing medium and low voltage distribution network is not high, when a 10kV medium voltage line branch fails, a power supply department is difficult to quickly obtain power failure information, and can arrange maintenance work to recover power supply only by relying on user feedback, thereby greatly influencing the power supply reliability of users. At present, few important user power supply lines adopt the condition monitoring of a power distribution network by means of a power distribution secondary terminal, a fault indicator and the like so as to identify a fault occurrence area, but the investment is large, the construction period is long, and the promotion is slow.
In the prior art, the invention can refer to a Chinese patent with application publication number of CN108287294A, and discloses a power failure distribution transformer and topology analysis-based method for rapidly identifying a power distribution network fault area, wherein a next power failure distribution transformer from a substation feeder outlet is randomly searched; reversely searching the nearest switch at the upstream of the line where the power failure distribution transformer is located; traversing downwards by the switch to search the line power failure distribution transformation ratio; and judging the line state according to the line power failure distribution transformation ratio, judging whether the power failure distribution transformation of the downward power failure of the feeder outlet of the transformer substation is inquired, if so, judging that a fault area exists between the nearest switch at the upstream of the most upstream power failure line and the next switch, if not, continuously and randomly searching the next power failure distribution transformation of the feeder outlet of the transformer substation, and circulating the steps until the power failure distribution transformation of the downward power failure of the feeder outlet of the transformer substation is inquired.
The above prior art solutions have the following drawbacks: under the existing circumstances and the background of the prior art, it is worth noting that the adjustment of the identification method is to achieve more efficient power grid restoration, although the existing identification method can judge whether the power grid should be regarded as a power failure (power failure) condition, it cannot provide sufficient restoration guide and restoration information for an operator, the operator still needs to restore the power failure distribution transformer in turn, the restoration efficiency is low, and because of the limitation of distance factors, when the distance of the first few power failure distribution transformers is far, the efficiency of power grid restoration is particularly delayed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a power failure distribution transformer and topology analysis-based power distribution network fault area rapid identification method, which can indicate an optimal path for repairing a power distribution network fault to an operator in time according to the power failure condition, thereby improving the maintenance efficiency.
The above object of the present invention is achieved by the following technical solutions:
a method for rapidly identifying a power distribution network fault area based on power failure distribution and transformation and topology analysis comprises the following steps,
randomly searching a power failure distribution transformer with a downward substation feeder outlet, and regarding the power failure distribution transformer as an initial power failure distribution transformer;
the initial power failure distribution transformer is used for simultaneously carrying out forward and reverse searching, finding the switch closest to the upstream of the initial power failure distribution transformer as an initial switch, finding the switch closest to the downstream of the initial power failure distribution transformer as a stop switch;
traversing all distribution transformers between the starting switch and the stopping switch, and calculating the power failure distribution transformer ratio X in a mathematical mode;
drawing a position plane diagram of all the distribution transformers between the starting switch and the stopping switch, and marking the positions of the power failure distribution transformers between the starting switch and the stopping switch on the position plane diagram;
dividing the total area of the position plan into a plurality of basic areas with equal areas;
sequencing all the basic areas, wherein the sequencing standard is that the number of the power failure distribution transformers in the basic areas is increased or decreased, and recording and forming a repair sequencing list according to the sequencing result;
and judging whether the distribution transformation between the starting switch and the stopping switch is traversed or not, if so, searching a power failure distribution transformation downwards from the stopping switch at random, regarding the new initial power failure distribution transformation as a new initial power failure distribution transformation, circulating the steps, and if not, traversing all the distribution transformations between the starting switch and the stopping switch again and repeating the steps.
Through adopting above-mentioned technical scheme, after dividing the power failure distribution transformer according to basic region, can effectively confirm the most basic region of power failure distribution transformer that appears, at this moment, arrange basic region according to the power failure distribution transformer quantity in an order, can effectively guide operating personnel to distribute the most basic region of transformer to power failure and restore preferentially, because the regional division of basis is the region of equidimension on the position plane map, the regional area that different basic regions actually correspond equals, operating personnel restores the most basic region of power failure distribution transformer quantity preferentially and can effectively promote remediation efficiency, reduce the time loss on route repetition and the route, improve the holistic remediation efficiency of electric wire netting.
The present invention in a preferred example may be further configured to: the method also comprises the following steps of,
and setting a power failure fault-tolerant threshold A and a non-power failure fault-tolerant threshold B, if X is larger than A, determining that the power between the starting switch and the stopping switch is cut off, if X is larger than B and X is smaller than A, determining that the power between the starting switch and the stopping switch is suspected to be cut off, and if X is smaller than B, determining that the power between the starting switch and the stopping switch is not cut off.
By adopting the technical scheme, the power failure fault-tolerant threshold A and the non-power failure fault-tolerant threshold B are given, an operator can compare the power failure distribution transformation ratio X with the power failure fault-tolerant threshold A and the non-power failure fault-tolerant threshold B, judge whether the whole power grid between the starting switch and the stop switch can stably realize the power supply function, confirm the urgent degree of repairing the power failure distribution transformation and adjust the repairing speed.
The present invention in a preferred example may be further configured to: the method also comprises the following steps of,
the difference between X and B is carried into the number of all the distribution transformers between the starting switch and the stopping switch, the operation result is rounded upwards, and the number C of the repair requirements is calculated;
selecting an area which contains the power failure distribution transformer quantity which is greater than C and is closest to C from all the basic areas, and marking the area as a priority repair area;
if the preferential repair area is not found, selecting the basic area containing the maximum number of the power failure distribution transformers as the central area, adding the number of the power failure distribution transformers of the central area and the number of the power failure distribution transformers of the basic area adjacent to the central area until a number larger than C is obtained, marking all the related basic areas on the position plan view, and regarding the basic areas as a preferential repair area group.
By adopting the technical scheme, if the preferential repair area is found smoothly, the whole power grid function between the starting switch and the stop switch can be recovered only by the power failure distribution change in one basic area of the preferential repair area by an operator, so that the repair efficiency in a power failure state is improved, and the power failure time can be shortened to the greatest extent.
The present invention in a preferred example may be further configured to: the power failure fault-tolerant threshold A is the average value of the number of power failure distribution transformer stations/the total number of power failure distribution transformer stations in a plurality of power failure events; the non-blackout fault-tolerant threshold B is the average value of the number of blackout distribution transformer stations/the total number of distribution transformer stations in a plurality of non-blackout events.
By adopting the technical scheme, the power failure fault-tolerant threshold value A is calculated by averaging the proportion of the power failure distribution transformer number and the total distribution transformer number in the historical record, so that the effect of carrying out the identification accuracy of the time by using historical experience assistance can be achieved, and the stability and the accuracy of subsequent identification can be continuously improved along with the increase of the identification number, so that no more accurate reference is provided by an operator.
The present invention in a preferred example may be further configured to: the method also comprises the following steps of,
repairing the power failure distribution transformer of all the basic areas in the priority repair area or the priority repair area group;
after the power failure distribution transformers corresponding to the priority repair areas or the priority repair area groups are repaired, sequentially repairing the power failure distribution transformers in the corresponding basic areas according to the sequence of the repair sequencing list;
and marking the basic area as an updating area on the position plane map every time the repair work of all the power failure distribution transformers in one basic area is completed.
By adopting the technical scheme, all repaired basic areas are marked as the updated areas, on one hand, the situation that the operator avoids repeated repair can be effectively indicated, on the other hand, the operator can be allowed to independently screen the repair situations of all the updated areas, and therefore the repair quality is assisted to be judged.
The present invention in a preferred example may be further configured to: further comprising the steps of:
traversing all the distribution transformers in all the updating areas, finding and marking the power failure distribution transformer quantity Y in each updating area on the position plan;
sorting the updating areas from more to less according to the power failure distribution and transformation quantity, and recording to form a repair repeated table;
giving a rechecking threshold value D, rechecking all distribution transformers in the updating area with Y being larger than D, and repairing the power failure distribution transformers in the updating area;
and repairing the power failure distribution transformer in the rest updating areas according to the repair lookup table.
By adopting the technical scheme, the given rechecking threshold value D can prompt the operator that the proportion of distribution transformer power failure is higher than the threshold value D although the update areas are repaired, so that the operator is reminded that the proportion of power failure distribution transformer power failure in the update areas is higher, the repair quality is lower or the power failure condition is more serious, the prior rechecking is needed, and the probability of the power failure condition caused by the fact that other distribution transformers in the area are not repaired is reduced.
The present invention in a preferred example may be further configured to: the rechecking threshold value D is calculated by the total number of the power failure distribution transformers/the number of the updating areas in all the updating areas.
By adopting the technical scheme, considering that the distribution transformer without power failure can not be repaired when the power failure distribution transformer is repaired, and the power failure condition of the distribution transformer still can occur on the basis of qualified repair quality possibly caused by time problems after repair, the average value of the power failure number of the distribution transformer in the update area can be calculated by using the total number of the power failure distribution transformer/the number of the update area in all the update areas, the update area with the power failure number above the average value can be roughly considered to need important attention, and an operator is reminded to actively perform recheck and overall check on the update areas, so that the repair efficiency and the recheck efficiency are improved.
The present invention in a preferred example may be further configured to: x is the number of blackout distribution transformers/total distribution transformers.
Through adopting above-mentioned technical scheme, calculate the shared proportion of power failure distribution transformer station number in indulging distribution transformer station number, can make things convenient for operating personnel to judge whether power failure distribution transformer can cause the power supply abnormal conditions to remind operating personnel to maintain by timing.
In summary, the invention includes at least one of the following beneficial technical effects:
1. the most efficient power failure distribution transformer repairing path can be provided for the operating personnel on the basis of identifying the power failure distribution transformer, so that the operating personnel can conveniently repair the power failure distribution transformer in a limited time;
2. an optimal approach for repairing the whole power grid can be provided for operators by taking the normal operation of the power grid as a target, so that the recovery efficiency of power grid repair is improved;
3. the repair quality can be effectively sequenced and judged, so that the operator can conveniently perform full-scale review and inspection on the area with the higher power failure proportion.
Detailed Description
The present invention will be described in further detail below.
The invention discloses a power failure distribution and topology analysis-based power distribution network fault area rapid identification method, which comprises the following steps of:
and randomly searching a power failure distribution transformer with a downward substation feeder outlet, and regarding the power failure distribution transformer as an initial power failure distribution transformer.
And simultaneously carrying out forward and reverse search on the initial power failure distribution transformer, finding the switch closest to the upstream of the initial power failure distribution transformer as an initial switch, finding the switch closest to the downstream of the initial power failure distribution transformer as a stop switch.
And traversing all distribution transformers between the starting switch and the stopping switch, and calculating the power failure distribution transformer proportion X in a mathematical mode, wherein X is the number of the power failure distribution transformers/the total number of the power failure distribution transformers.
Drawing a position plane diagram of all the distribution and transformation between the starting switch and the stopping switch, and marking the positions of the power failure distribution and transformation between the starting switch and the stopping switch on the position plane diagram.
The total area of the location plan is divided into a number of base areas of equal area and each area is one hectare.
And sequencing all the basic areas, wherein the sequencing standard is that the number of the power failure distribution transformers in the basic areas is increased or decreased, and recording and forming a repair sequencing list according to the sequencing result.
The operator can carry out the repair work of the power failure distribution transformer according to the sequencing list, and because the areas of each basic area are approximately equal, the repair time of the distribution transformer in the same basic area can be effectively reduced by the operator on the journey, and therefore the maintenance efficiency is improved.
And judging whether the distribution transformation between the starting switch and the stopping switch is traversed or not, if so, searching a power failure distribution transformation downwards from the stopping switch at random, regarding the new initial power failure distribution transformation as a new initial power failure distribution transformation, circulating the steps, and if not, traversing all the distribution transformations between the starting switch and the stopping switch again and repeating the steps.
And after the number of the power failure distribution transformers is obtained for the first time, rechecking the distribution transformers between the same starting switch and the same stopping switch, and determining whether the distribution transformers which are missed in the traversing process exist, so that the accuracy of final operation data is ensured.
And setting a power failure fault-tolerant threshold A and a non-power failure fault-tolerant threshold B, if X is larger than A, determining that the power between the starting switch and the stopping switch is cut off, if X is larger than B and X is smaller than A, determining that the power between the starting switch and the stopping switch is suspected to be cut off, and if X is smaller than B, determining that the power between the starting switch and the stopping switch is not cut off. The power failure fault-tolerant threshold A is the average value of the number of power failure distribution transformer stations/the total number of power failure distribution transformer stations in a plurality of power failure events; the non-blackout fault-tolerant threshold B is the average value of the number of blackout distribution transformer stations/the total number of distribution transformer stations in a plurality of non-blackout events.
By giving a power failure fault-tolerant threshold A and a non-power failure fault-tolerant threshold B, an operator can compare a power failure distribution ratio X with the power failure fault-tolerant threshold A and the non-power failure fault-tolerant threshold B, judge whether the whole power grid between a starting switch and a stop switch can stably realize a power supply function, confirm the urgent degree of repairing the power failure distribution ratio and adjust the repairing speed.
And (4) performing difference on the X and the B, and bringing the difference into the quantity of all the distribution transformers between the starting switch and the stopping switch, rounding up the operation result, and calculating the quantity C of the repair requirements.
The restoration demand amount C is the minimum restoration amount that can restore the grid to the uninterruptible state.
And selecting an area which contains the power failure distribution transformation quantity which is greater than C and is closest to C from all the basic areas, and marking the area as a priority repair area.
If the preferential repair area is not found, selecting the basic area containing the maximum number of the power failure distribution transformers as the central area, adding the number of the power failure distribution transformers of the central area and the number of the power failure distribution transformers of the basic area adjacent to the central area until a number larger than C is obtained, marking all the related basic areas on the position plan view, and regarding the basic areas as a preferential repair area group.
And repairing the power failure distribution transformer of all the basic areas in the priority repair area or the priority repair area group.
When the power supply restoration is carried out, in order to achieve the restoration effect on the whole power grid as soon as possible, the power failure distribution transformer of the priority restoration area is preferentially restored or the basic areas close to each other in the priority restoration area group are preferentially restored, so that the power supply restoration efficiency can be effectively improved, and the duration time of the power failure state is shortened.
And after the power failure distribution transformers corresponding to the priority repair areas or the priority repair area groups are repaired, sequentially repairing the power failure distribution transformers in the corresponding basic areas according to the sequence of the repair sequencing list.
And marking the basic area as an updating area on the position plane map every time the repair work of all the power failure distribution transformers in one basic area is completed.
And traversing all the distribution transformers in all the updating areas, and finding and marking the number Y of the power failure distribution transformers in each updating area on the position plan.
And sequencing the updating areas from more to less according to the power failure distribution and transformation quantity, and recording to form a repair repeated table.
And given a rechecking threshold D, calculating the rechecking threshold D in a mode of the total number of the power failure distribution transformers/the number of the updating areas in all the updating areas. And (4) rechecking all the distribution transformers of all the updating areas with Y larger than D, and repairing the power failure distribution transformers in the updating areas.
And repairing the power failure distribution transformer in the rest updating areas according to the repair lookup table.
After the repair is completed, the number Y of the power-off distribution transformers in the updating area can be used for operators to refer to whether the repair quality reaches the standard or not, and the operators can review all the distribution transformers in the updating area with doubtful repair quality by combining the problems of use time and the like, so that the repair quality is guaranteed, and the power-off probability of the distribution transformers is reduced.
The implementation principle of the embodiment is as follows: the method is used for identifying the fault area, a plurality of reference data or reference information such as a repair sequencing list, a priority repair area, a repair review list and the like can be given to an operator, the operator can repair the concentrated power failure distribution transformer preferentially according to the information so as to ensure that the time length of the power grid fault is shortened as much as possible, the stable operation of the power grid is recovered timely, whether the repair quality is qualified or not is confirmed timely after the repair is finished, and the overall review is carried out on the basic area with multiple power failures, so that the probability of power failure of the distribution transformer is reduced.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. A power failure distribution transformation and topology analysis based power distribution network fault area rapid identification method is characterized by comprising the following steps:
randomly searching a power failure distribution transformer with a downward substation feeder outlet, and regarding the power failure distribution transformer as an initial power failure distribution transformer;
the initial power failure distribution transformer is used for simultaneously carrying out forward and reverse searching, finding the switch closest to the upstream of the initial power failure distribution transformer as an initial switch, finding the switch closest to the downstream of the initial power failure distribution transformer as a stop switch;
traversing all distribution transformers between the starting switch and the stopping switch, and calculating the power failure distribution transformer ratio X in a mathematical mode;
drawing a position plane diagram of all the distribution transformers between the starting switch and the stopping switch, and marking the positions of the power failure distribution transformers between the starting switch and the stopping switch on the position plane diagram;
dividing the total area of the position plan into a plurality of basic areas with equal areas;
sequencing all the basic areas, wherein the sequencing standard is that the number of the power failure distribution transformers in the basic areas is increased or decreased, and recording and forming a repair sequencing list according to the sequencing result;
and judging whether the distribution transformation between the starting switch and the stopping switch is traversed or not, if so, searching a power failure distribution transformation downwards from the stopping switch at random, regarding the new initial power failure distribution transformation as a new initial power failure distribution transformation, circulating the steps, and if not, traversing all the distribution transformations between the starting switch and the stopping switch again and repeating the steps.
2. The method for rapidly identifying the fault area of the power distribution network based on the power outage distribution transformer and the topology analysis as claimed in claim 1, further comprising the following steps: and setting a power failure fault-tolerant threshold A and a non-power failure fault-tolerant threshold B, if X is larger than A, determining that the power between the starting switch and the stopping switch is cut off, if X is larger than B and X is smaller than A, determining that the power between the starting switch and the stopping switch is suspected to be cut off, and if X is smaller than B, determining that the power between the starting switch and the stopping switch is not cut off.
3. The method for rapidly identifying the fault area of the power distribution network based on the power outage distribution transformer and the topology analysis as claimed in claim 2, further comprising the following steps:
the difference between X and B is carried into the number of all the distribution transformers between the starting switch and the stopping switch, the operation result is rounded upwards, and the number C of the repair requirements is calculated;
selecting an area which contains the power failure distribution transformer quantity which is greater than C and is closest to C from all the basic areas, and marking the area as a priority repair area;
if the preferential repair area is not found, selecting the basic area containing the maximum number of the power failure distribution transformers as the central area, adding the number of the power failure distribution transformers of the central area and the number of the power failure distribution transformers of the basic area adjacent to the central area until a number larger than C is obtained, marking all the related basic areas on the position plan view, and regarding the basic areas as a preferential repair area group.
4. The method for rapidly identifying the fault area of the power distribution network based on the power outage distribution transformer and the topology analysis as claimed in claim 2, wherein: the power failure fault-tolerant threshold A is the average value of the number of power failure distribution transformer stations/the total number of power failure distribution transformer stations in a plurality of power failure events; the non-blackout fault-tolerant threshold B is the average value of the number of blackout distribution transformer stations/the total number of distribution transformer stations in a plurality of non-blackout events.
5. The method for rapidly identifying the fault area of the power distribution network based on the power outage distribution transformer and the topology analysis as claimed in claim 3, further comprising the following steps:
repairing the power failure distribution transformer of all the basic areas in the priority repair area or the priority repair area group;
after the power failure distribution transformers corresponding to the priority repair areas or the priority repair area groups are repaired, sequentially repairing the power failure distribution transformers in the corresponding basic areas according to the sequence of the repair sequencing list;
and marking the basic area as an updating area on the position plane map every time the repair work of all the power failure distribution transformers in one basic area is completed.
6. The method for rapidly identifying the fault area of the power distribution network based on the outage distribution transformer and the topology analysis as claimed in claim 5, further comprising the following steps:
traversing all the distribution transformers in all the updating areas, finding and marking the power failure distribution transformer quantity Y in each updating area on the position plan;
sorting the updating areas from more to less according to the power failure distribution and transformation quantity, and recording to form a repair repeated table;
giving a rechecking threshold value D, rechecking all distribution transformers in the updating area with Y being larger than D, and repairing the power failure distribution transformers in the updating area;
and repairing the power failure distribution transformer in the rest updating areas according to the repair lookup table.
7. The method for rapidly identifying the fault area of the power distribution network based on the power outage distribution transformer and the topology analysis as claimed in claim 6, wherein: the rechecking threshold value D is calculated by the total number of the power failure distribution transformers/the number of the updating areas in all the updating areas.
8. The method for rapidly identifying the fault area of the power distribution network based on the power outage distribution transformer and the topology analysis as claimed in claim 1, wherein: x is the number of blackout distribution transformers/total distribution transformers.
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| CN114915558A (en) * | 2022-06-08 | 2022-08-16 | 广东电网有限责任公司 | Distribution network mixed operation control method and device, electronic equipment and storage medium |
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