CN111433617B - Method and device for positioning fault point in regional network based on traveling wave - Google Patents
Method and device for positioning fault point in regional network based on traveling wave Download PDFInfo
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Abstract
The invention relates to a method and a device for positioning fault points in a regional network based on traveling waves, wherein the regional network comprises a plurality of substations, two adjacent substations are connected through a power line, and the method comprises the following steps: if a fault point of the power line is identified, acquiring a time point set, wherein the time point set comprises time points when a traveling wave corresponding to the fault point reaches each transformer substation; acquiring a position set, wherein the position information set comprises position information of each transformer substation; determining a transformer substation from the area network as an initial target point; determining a plurality of substations from the rest substations as reference points corresponding to the target points, wherein power lines between at least two reference points and the target points need to pass through fault points; determining a first distance between the fault point and the target point according to the time point set, the position set and the reference point; and determining the position of the fault point according to the first distance. According to the invention, the fault point can be accurately positioned.
Description
Technical Field
The invention relates to the field of electric power, in particular to a method and a device for positioning a fault point in a regional network based on traveling waves.
Background
Electric power is the foundation of national economy and is an important industry of the pillars, and therefore, electric power systems must be safe and reliable. The power system generally comprises a generator, a transformer, a bus, a power line and electric equipment. The electrical components and systems are normally in normal operation, but may also be in a fault or abnormal operation.
As the scale of the power system becomes larger and larger, the structure becomes more and more complex, and the occurrence of a fault is inevitable. Especially, the power line is often affected by various complex geographical environments and climatic environments due to its wide distribution range, and when the power line fails in operation due to adverse environmental conditions, the power line can be directly affected in safe and reliable operation, and even a large-area power failure accident can be caused in severe cases. Thus, when a power line fails, a failure point is rapidly determined for timely maintenance.
Therefore, how to accurately determine the position of the fault point becomes an urgent problem to be solved.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for locating a fault point in a regional network based on a traveling wave, so as to achieve accurate location of the fault point.
One aspect of the present invention provides a method for locating a fault point in a regional network based on a traveling wave, where the regional network includes a plurality of substations, and two adjacent substations are connected by a power line, the method including:
if a fault point of the power line is identified, acquiring a time point set, wherein the time point set comprises time points when a traveling wave corresponding to the fault point reaches each transformer substation;
acquiring a position set, wherein the position information set comprises position information of each transformer substation;
determining a transformer substation from the area network as an initial target point;
determining a plurality of substations from the rest substations as reference points corresponding to the target points, wherein power lines between at least two reference points and the target points need to pass through the fault points;
determining a first distance between the fault point and the target point according to the time point set, the position set and the reference point;
and determining the position of the fault point according to the first distance.
After a fault point of a power line is identified, the time of a traveling wave reaching a plurality of substations is obtained, an initial target point and a plurality of reference points are determined, and the position of the fault point is determined by combining the traveling wave time received by the plurality of substations in the same area network, the position set of the plurality of substations and the plurality of reference points, so that the position of the fault point can be determined more accurately. In addition, the method of the embodiment does not determine the position of the fault point by determining the wave speed of the traveling wave, so that the condition that the final positioning result is inaccurate due to the possible change of the wave speed is avoided.
According to the foregoing method, optionally, determining a first distance between the fault point and the target point according to the set of time points, the set of locations, and the reference point comprises:
determining the time difference between the traveling wave reaching the target point and reaching each reference point according to the time point set;
determining a second distance between the target point and each reference point according to the position set;
and determining a first distance between the fault point and the target point according to the time differences and the second distances.
According to the foregoing method, optionally, determining a substation from the area network as an initial target point comprises: and determining one of the substations at two ends of the power line where the fault point is located as an initial target point.
Because the travelling wave can attenuate, the travelling wave that the transformer substation of the both ends of the power line that the fault point is located received is relatively stronger, therefore the testing result of travelling wave is comparatively accurate, and then can make the final location of fault point comparatively accurate.
According to the foregoing method, optionally, after determining the first distance between the fault point and the target point according to each of the time differences and each of the second distances, and before determining the position of the fault point according to the first distance, the method further includes:
determining another substation from the area network as an updated target point, and returning to perform the operation of determining a plurality of reference points from the rest of the substations until another first distance between the fault point and the updated target point is determined;
correcting a first distance b/2 between the fault point and the initial target point according to the following formula:
b/2 ═ 2 (the first distance + a third distance between two substations at both ends of the power line where the fault point is located-the other first distance).
The corrected first distance simultaneously considers the distance between the first distance and two target points, so that the fault point can be more accurately positioned.
According to the foregoing method, optionally, the initial target point is one of the substations at two ends of the power line where the fault point is located, and the updated target point is the other of the substations at two ends of the power line where the fault point is located.
Because the travelling wave can attenuate, the travelling wave that the transformer substation of the both ends of the power line that the fault point is located received is relatively stronger, therefore the testing result of travelling wave is comparatively accurate, and then can make the final location of fault point comparatively accurate.
According to the foregoing method, optionally, the determining a first distance between the fault point and the target point according to the respective time differences and the respective second distances comprises:
determining a first distance b/2 between the fault point and the target point according to the following formula:
wherein, XiRepresenting the time difference between the arrival of said travelling wave at the ith said reference point and the arrival of said travelling wave at said target point, YiAnd representing a second distance between the ith reference point and the target point, n represents the number of the reference points, i and n are positive integers, a represents the negative number of the wave speed of the traveling wave, and b is twice the first distance between the fault point and the target point.
Optionally, the travelling wave is a travelling current wave according to the method described above. The current traveling wave is easier to detect, the requirement on the device for realizing positioning is lower, and therefore, the cost is lower.
According to the foregoing method, optionally, the time point when the traveling wave arrives at each substation is a time point when the wave head of the traveling wave arrives at each substation.
Another aspect of the present invention provides a method for locating a fault point in a regional network based on a traveling wave, where the regional network includes a plurality of substations, and two adjacent substations are connected by a power line, the method includes:
the first acquisition unit is used for acquiring a time point set if a fault point of the power line is identified, wherein the time point set comprises time points when a traveling wave corresponding to the fault point reaches each transformer substation;
a second obtaining unit, configured to obtain a location set, where the location information set includes location information of each substation;
a first determining unit for determining a substation from the area network as an initial target point;
a second determination unit for determining a plurality of substations from the remaining substations as reference points corresponding to the target points, and the power lines between at least two of the reference points and the target points need to pass through the fault point;
a third determining unit, configured to determine a first distance between the fault point and the target point according to the time point set, the location set, and the reference point;
a fourth determining unit for determining the location of the fault point based on the first distance.
After a fault point of a power line is identified, the time of a traveling wave reaching a plurality of substations is obtained, an initial target point and a plurality of reference points are determined, and the position of the fault point is determined by combining the traveling wave time received by the plurality of substations in the same area network, the position set of the plurality of substations and the plurality of reference points, so that the position of the fault point can be determined more accurately. In addition, the method of the embodiment does not determine the position of the fault point by determining the wave speed of the traveling wave, so that the possibility that the final positioning result is inaccurate due to the possible change of the wave speed is avoided.
According to the foregoing apparatus, optionally, the third determining unit specifically includes:
a determining time subunit, configured to determine, according to the set of time points, a time difference between the traveling wave arriving at the target point and arriving at each of the reference points;
a first distance determining subunit, configured to determine a second distance between the target point and each of the reference points according to the position set;
a second distance determining subunit, configured to determine the first distance between the fault point and the target point according to the time differences and the second distances.
According to the foregoing apparatus, optionally, the first determining unit is specifically configured to: and determining one of the substations at two ends of the power line where the fault point is located as an initial target point. Because the travelling wave can attenuate, the travelling wave that the transformer substation of the both ends of the power line that the fault point is located received is relatively stronger, therefore the testing result of travelling wave is comparatively accurate, and then can make the final location of fault point comparatively accurate.
According to the foregoing apparatus, optionally, further comprising a correction unit for:
determining another substation from the area network as an updated target point, and returning to trigger the second determination unit until another first distance between the fault point and the updated target point is determined;
correcting a first distance b/2 between the fault point and the initial target point according to the following formula:
b/2 ═ 2 (the first distance + a third distance between two substations at both ends of the power line where the fault point is located-the other first distance).
The corrected first distance simultaneously considers the distance between the first distance and two target points, so that the fault point can be more accurately positioned.
According to the foregoing apparatus, optionally, the initial target point is one of the substations at two ends of the power line where the fault point is located, and the updated target point is the other of the substations at two ends of the power line where the fault point is located. Because the travelling wave can attenuate, the travelling wave that the transformer substation of the both ends of the power line that the fault point is located received is relatively stronger, therefore the testing result of travelling wave is comparatively accurate, and then can make the final location of fault point comparatively accurate.
According to the foregoing apparatus, optionally, the second determined distance subunit is specifically configured to:
determining a first distance b/2 between the fault point and the target point according to the following formula:
wherein, XiRepresenting the time difference between the arrival of said travelling wave at the ith said reference point and the arrival of said travelling wave at said target point, YiAnd representing a second distance between the ith reference point and the target point, n represents the number of the reference points, i and n are positive integers, a represents the negative number of the wave speed of the traveling wave, and b is twice the first distance between the fault point and the target point.
Optionally, the travelling wave is a travelling current wave. The current traveling wave is easier to detect, the requirement on the device for realizing positioning is lower, and therefore, the cost is lower.
According to the foregoing apparatus, optionally, the time point when the traveling wave arrives at each substation is a time point when the wave head of the traveling wave arrives at each substation.
In another aspect, the present invention provides a method for locating a fault point in a regional network based on a traveling wave, the regional network including a plurality of substations, two adjacent substations being connected by a power line, the method including:
at least one communication interface for communicating with the respective substation;
at least one memory for storing location information of the substations;
at least one processor, connected to the communication interface and the memory, for acquiring the data sent by the communication interface and the location information in the memory, wherein the processor is configured to execute any one of the methods for locating a fault point in an area network based on traveling waves.
In another aspect, the present invention provides a method for locating a fault point in a regional network based on a traveling wave, the regional network including a plurality of substations, two adjacent substations being connected by a power line, the method including:
at least one memory for storing instructions;
at least one processor configured to execute the method for traveling wave based localization of points of failure in an area network according to any of the preceding claims in accordance with instructions stored by the memory.
Yet another aspect of the present invention provides a readable storage medium having stored therein machine readable instructions which, when executed by a machine, perform a method for traveling wave based location of a point of failure in an area network according to any of the preceding claims.
Drawings
The foregoing and other features and advantages of the invention will become more apparent to those skilled in the art to which the invention relates upon consideration of the following detailed description of a preferred embodiment of the invention with reference to the accompanying drawings, in which:
fig. 1 is a flowchart illustrating a method for locating a fault point in an area network based on traveling waves according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating a method for locating a fault point in an area network based on traveling waves according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a local area network according to yet another embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an apparatus for locating a fault point in an area network based on a traveling wave according to another embodiment of the present invention.
Fig. 5A is a schematic structural diagram of an apparatus for locating a fault point in an area network based on a traveling wave according to another embodiment of the present invention.
Fig. 5B is a schematic structural diagram of an apparatus for locating a fault point in an area network based on a traveling wave according to still another embodiment of the present invention.
Fig. 6 is a schematic structural diagram of an apparatus for locating a fault point in an area network based on a traveling wave according to another embodiment of 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 by referring to the following examples.
A regional network typically includes a plurality of substations connected by power lines, i.e. two directly communicating substations connected by power lines. The substations belonging to the same area network can communicate directly or indirectly. Each transformer substation is provided with a relay protection device and a traveling wave detection device. Whether a power line in the area network has a fault can be known through the relay protection device or the traveling wave detection device. For example, whether the power line is faulty or not can be known from a change in voltage or current, or whether the power line is faulty or not can be determined by detecting whether there is a traveling wave or not. How to identify whether a power line of a local area network has a fault point belongs to the prior art, and is not described herein again.
If a power line fault point of the area network is identified, the location of the fault point needs to be confirmed next. Because the power lines between the substations are long, the power lines are generally dozens of kilometers or even hundreds of kilometers. Therefore, the specific location of the failure point needs to be confirmed for timely inspection.
The method and the device determine the specific position of the fault point by utilizing the traveling wave information received by each transformer substation in the area network and the position of each transformer substation, so that the fault point can be positioned more accurately.
Example one
The embodiment provides a method for positioning a fault point in a regional network based on traveling waves, and an executive body is a device for positioning the fault point in the regional network based on the traveling waves. The device can communicate with a traveling wave detection device and also can communicate with a relay protection device.
Fig. 1 is a schematic flowchart of a method for locating a fault point in an area network based on traveling waves according to this embodiment.
The method comprises the following steps:
The area network includes a plurality of substations connected by power lines. The substations belonging to the same area network can communicate directly or indirectly.
The time point set comprises time points when a traveling wave corresponding to the fault point reaches each transformer substation. The traveling wave detection device can detect the time point when the traveling wave reaches each transformer substation. In this embodiment, for example, the time point when the traveling wave first reaches each substation may be selected. It should be noted that the manner of acquiring the time point set may be that a device based on a fault point in the traveling wave positioning area network respectively receives the time points sent by the traveling wave detection devices in the substations, or another device aggregates the time points and sends the time point set to a device based on a fault point in the traveling wave positioning area network, as long as the time point at which a traveling wave corresponding to the fault point reaches the substations can be acquired. For simplicity of description, each point in time at which the traveling wave arrives at each substation is referred to as a "set of points in time". The acquisition activity may be actively initiated or passively received.
In this embodiment, a relay protection device or a traveling wave detection device may be specifically used to determine whether a power line has a fault point, and then notify a device based on the fault point in the traveling wave positioning area network, or after the relay protection device or the traveling wave detection device identifies the fault point, directly trigger the device based on the fault point in the traveling wave positioning area network to execute an operation of acquiring a time point set, for example, the traveling wave detection device directly sends a traveling wave to the device based on the fault point in the traveling wave positioning area network to reach a time point of a substation.
The position information of each substation can be represented by longitude and latitude, or by a basic reference object, and can be specifically selected according to actual needs, which is not described herein again. The position set may be pre-stored in the device for locating the fault point in the area network based on the traveling wave, or may be pre-stored in a memory, from which the device for locating the fault point in the area network based on the traveling wave can obtain the position set when necessary. The detailed implementation is not described again.
In this embodiment, any substation in the area network that can detect the arrival time of the traveling wave may be selected as an initial target point, and a plurality of reference points may be determined from the remaining substations, and the number of the reference points may be selected according to actual needs. And the transformer substation, which needs the power line between the target point and the fault point to pass through, is actually the opposite-end transformer substation of the target point based on the fault point. And one part of the reference point can be an opposite-end transformer substation, and also can be the opposite-end transformer substations. When the reference points are all opposite-end transformer substations, the calculated amount can be simplified, and the final result can be obtained quickly.
And 104, determining a first distance between the fault point and the target point according to the time point set, the position set and the reference point.
And step 105, determining the position of the fault point according to the first distance.
Since the position of the target point and the direction in which the power lines are arranged are already known in advance, the position of the fault point can be directly determined after the positions of the fault point and the target point are known. The worker can directly reach the location of the fault point for maintenance. Of course, the power line may be traveled a first distance along the power line from the target point to the location of the fault point.
It should be noted that the sequence of step 102 only needs to be before step 104, for example, it may be obtained in advance, that is, before step 101, or may be executed simultaneously with step 101, or before step 103, or may be executed simultaneously with step 103, which may be determined specifically according to actual needs, and is not described herein again. Similarly, step 103 may be performed after the power line has failed and before step 104. Step 103, step 104 and step 101 do not have a specific order either, and may be executed simultaneously, or may be executed before or after step 101. For example, after a power line fault is identified, a target point and a reference point may be determined first, and at this time, the time point set includes time points at which one traveling wave corresponding to the fault point reaches each determined substation, that is, only time points at which the traveling wave reaches the target point and the reference point. Accordingly, only the position information of the target point and the reference point may be included in the position set. If the determination of the target point and the reference point is placed after the time point set is obtained, the situation that a transformer substation with a problem of the traveling wave detection device is used as the target point or the reference point can be avoided.
The traveling wave of this embodiment may be a voltage traveling wave or a current traveling wave. The current traveling wave is easy to detect, and the requirement on a device for realizing positioning is low, so that the cost is low.
According to the embodiment, after the fault point of the power line is identified, the time of a traveling wave reaching a plurality of substations is obtained, an initial target point and a plurality of reference points are determined, and the position of the fault point is determined by combining the traveling wave time received by the plurality of substations in the same area network, the position set of the plurality of substations and the plurality of reference points, so that the position of the fault point can be determined more accurately. In addition, the method of the embodiment does not determine the position of the fault point by determining the wave speed of the traveling wave, so that the condition that the final positioning result is inaccurate due to the possible change of the wave speed is avoided.
Example two
The present embodiment further provides a supplementary description of the method for locating a fault point in a regional network sink based on traveling waves in the first embodiment.
Fig. 2 is a schematic flowchart of a method for locating a fault point in an area network based on traveling waves according to this embodiment.
The method comprises the following steps:
in step 201, if it is identified whether a fault point occurs on the power line, a time point set is obtained.
This step is identical to step 101 and will not be described herein.
The sequence of step 202 only needs to be before step 206, for example, it may be obtained in advance, that is, before step 201, or may be executed simultaneously with step 201, and may be determined specifically according to actual needs, and is not described herein again.
For example, one of the substations at both ends of the power line where the fault point is located may be used as the initial target point. Specifically, the power line with the fault and the substations at the two ends may be determined according to the detection or the action of the relay protection device, or which two substations are the two substations closest to the fault point may be determined according to the time of the received traveling wave, which is not described in detail. Because the travelling wave can attenuate, the travelling wave that the transformer substation of the both ends of the power line that the fault point is located received is relatively stronger, therefore the testing result of travelling wave is comparatively accurate, and then can make the final location of fault point comparatively accurate.
The power line between the reference point and the target point needs to pass through the fault point
The embodiment may use all the opposite-end substations of the target point based on the fault point as the reference points. If the fault detectors of some opposite-end substations have problems and cannot detect the traveling waves, all the remaining opposite-end substations capable of detecting the traveling waves can be used as reference points, and the opposite-end substations based on the fault points are the substations of which the power lines between the opposite-end substations and the target points need to pass through the fault points. For example, as shown in fig. 3, assuming that the failure point is located between B and D and B is the target point, then the opposite substation of B is D, E, F, G, H, I, J. Assuming that the failure point is located between D and E and B is the target point, the opposite substation of B is E, F, G, H, I, J. Assuming that the fault point is located between E and G and E is the target point, then the opposite substation for E is G, H, I, J.
And step 205, determining the time difference between the traveling wave reaching the target point and each reference point according to the time point set.
The set of time points has a time point at which the traveling wave arrives at each substation, and more specifically, may be a time point at which a wave head of the traveling wave arrives at each substation. Thus, after the target point and the reference point are determined, the time difference of the traveling wave reaching the target point and the reference point can be determined.
And step 206, determining a second distance between the target point and each reference point according to the position set.
This step 206 may be performed simultaneously with step 205, or before or after step 205, and will not be described in detail.
And step 207, determining a first distance between the fault point and the target point according to the time differences and the second distances.
Specifically, the first distance b/2 between the fault point and the target point may be determined according to the following formula:
wherein, XiRepresenting the time difference between the arrival of the travelling wave at the ith reference point and the target point, YiAnd a second distance between the ith reference point and the target point is represented, n represents the number of the reference points, i and n are positive integers, a represents the negative number of the wave speed of the traveling wave, and b is twice the first distance between the fault point and the target point.
It can be seen from the formula that the first distance is obtained independently of the wave speed of the traveling wave and is only related to the reference point, the target point and the time point when the traveling wave arrives at the substation, and since the wave speed of the traveling wave may change due to the change of the external environment or the measurement is not accurate enough, the first distance can be obtained more accurately by eliminating the wave speed. In addition, clocks of the traveling wave detection devices of the substations may not be synchronous, and by adopting the formula obtained by fitting the straight line, errors of calculation results caused by measurement errors of the traveling wave detection devices can be reduced, so that the positions of fault points can still be accurately determined.
And step 208, determining the position of the fault point according to the first distance.
Since the position of the target point and the direction in which the power lines are arranged are already known in advance, the position of the fault point can be directly determined after the positions of the fault point and the target point are known. The worker can directly reach the location of the fault point for maintenance. Of course, the power line may be traveled a first distance along the power line from the target point to the location of the fault point.
Optionally, between step 207 and step 208, further comprising:
determining another substation from the area network as an updated target point, and returning to execute the step 204 until another first distance between the fault point and the updated target point is determined;
the first distance b/2 between the fault point and the initial target point is corrected according to the following formula:
b/2 ═ 2 (first distance + third distance between two substations at both ends of the power line where the fault point is located — another first distance).
The initial target point is assumed to be one of the substations at the two ends of the power line where the fault point is located, and the updated target point is the other one of the substations at the two ends of the power line where the fault point is located. Step 204 is executed back until another first pitch is determined. And correcting the first interval corresponding to the initial target point according to the acquired other first interval, and executing step 208 by using the corrected first interval.
The corrected first distance simultaneously considers the distance between the first distance and two target points, so that the fault point can be more accurately positioned. Of course, in actual operation, it is also possible to locate the fault point by using an initial target point without correction, which may be specifically selected according to actual needs.
According to the embodiment, the first distance between the fault point and a target point is determined by adopting the traveling wave time received by a plurality of substations in the same regional network and the position set of the plurality of substations, and the position of the fault point is determined according to the first distance, so that the position of the fault point can be determined more accurately.
EXAMPLE III
The present embodiment exemplifies a method for locating a fault point in an area network based on a traveling wave according to the above embodiment.
Fig. 3 is a schematic diagram of a structure of a local area network 300. The area network 300 includes A, B, C, D, E, G, F, H, I, J, H and other 11 substations, and two adjacent substations are connected via power lines. Each transformer substation is provided with a relay protection device or a traveling wave detection device, and the relay protection device or the traveling wave detection device can detect whether a power line in the regional network has a fault. When a fault occurs, a traveling wave is emitted from the fault point, and the traveling wave can be acquired by the traveling wave detection device. The traveling wave detection device can also acquire the time point when the traveling wave reaches each transformer substation. Each traveling wave detection device may communicate with a device that locates a point of failure in the area network based on the traveling wave. The device for positioning the fault point in the area network based on the traveling wave stores the position information of each transformer substation in advance.
It is assumed that a fault point is determined to occur between D and E according to the intensity of the traveling wave. Selecting D as initial target point, and the distance between fault point and target point is DDWherein
dD＝(ΔtDEv+lDE)/2 (1)
ΔtDE＝tD-tE (2)
Where v denotes the wave velocity of the traveling wave, lDEDenotes the spacing between D and E, Δ tDERepresenting the time difference between the arrival of the travelling wave at D and the arrival at E, tDRepresents the point in time, t, at which the travelling wave arrives at DEIndicating the point in time when the traveling wave arrives at E.
Based on the foregoingFormula, when transformer substation m is selected as target point and transformer substation j is selected as reference point, the distance d between fault point and target point mmIt can be expressed as the following equation:
dm＝(Δtmjv+lmj)/2 (3)
Δtmj＝tm-tj (4)
where v denotes the wave velocity of the traveling wave, lmjDenotes the spacing between m and j, Δ tmjRepresenting the time difference between the arrival of the travelling wave at m and the arrival at j, tmRepresents the point in time, t, at which the traveling wave arrives at mjRepresenting the point in time at which the traveling wave arrives at j.
Thus, lmj＝2dm-Δtmjv (5)
The number of the selected target points can be determined according to actual needs, for example, 1, 2, 5 or even more, and for example, each substation in the area network can be selected as a target point. When the number of the target points is 1 or 2, the position of the fault point can be determined more accurately, and the time for determining the position is quicker.
Let Y be lmj，X＝Δtmj，a＝-v，b＝2dmThus, the following fitted straight line formula is formed according to formula (5):
Y＝aX+b (6)
after target m is selected, it can select n reference points, so that n data are generated according to equation (6).
Accordingly, the following formula can be generated according to formula (6):
wherein, XiRepresenting the time difference between the travelling wave arriving at the ith reference point and the travelling wave arriving at the target point, YiAnd a second distance between the ith reference point and the target point is represented, n represents the number of the reference points, and i and n are positive integers.
The following formula is generated from formula (7):
the values of a and b may be obtained according to equation (8). As can be seen from equation (8), the value of b does not depend on the value of a, i.e., the acquisition of the fault point position information does not depend on the wave speed of the traveling wave. Because the wave speed of the traveling wave may change along with the change of the external environment, the method for acquiring the position information of the fault point of the embodiment can avoid using the wave speed of the traveling wave, and further, the result is more accurate.
In the following, a specific example will be given of the speed at which a fault point occurs between D and E, a traveling wave is a current traveling wave, and a wave head with a traveling wave speed reaches each substation.
Example one: and D is selected as a target point, and the opposite-end substation of D is E, F, G, H, I, J, H at the moment. And D, after additional measurement, finding that the fault detectors of all the opposite-end substations of D are in a normal working state, and determining all the opposite-end substations corresponding to D as reference points. As shown in table 1, is a list of the times at which the respective traveling waves arrive at the respective substations.
TABLE 1
And acquiring the time difference between the traveling wave and each substation according to the table 1, and determining the distance between the D and the opposite-end substation according to the position information acquired by each substation in advance, wherein the delta T represents the time difference between the traveling wave and each reference point and the target point as shown in the table 2.
TABLE 2
The data in table 2 was substituted into equation (8) to obtain a-02990 km/μ s and b-239.9998 km, and the wave velocity of the traveling wave was obtained to be 2.990 × 105km/s, first distance D between fault point and DD119.9999 km.
Next, E may be selected as the target point, and the opposite-end substation of E is A, B, C, D. And after detection, finding that the fault detectors of all the opposite-end substations of the E are in a normal working state, and determining all the opposite-end substations corresponding to the E as reference points. And acquiring the time difference between the traveling wave and each substation according to the table 1, and determining another first distance between the E and the opposite-end substation according to the position information acquired by each substation in advance, wherein the delta T represents the time difference between the traveling wave and each reference point and the target point as shown in the table 3.
TABLE 3
| Reference point | Distance/(km) between reference point and target point | ΔT/(μs) |
| A | 320 | -535.12 |
| B | 270 | -367.89 |
| C | 420 | -869.57 |
| D | 200 | -133.78 |
The data in table 3 is substituted into equation (8), and finally a is-0.299 km/μ s, b is 160km, and the wave velocity of the traveling wave obtained is 2.990 × 105km/s, first distance d between fault point and EEWas 80.00 km.
Next for D between the failure point and DDMaking a correction, or a corrected first pitch dD’。
Since the position of D is known in advance, according to DDThe specific geographical location of the failure point can be known.
According to actual measurement, the fault point is determined as a position with a distance of 120km from D.
Example two
As shown in fig. 3, assuming that the fault detector of E fails, the traveling wave cannot be detected. F. The clocks of the fault detectors of G and I are not synchronized in time, resulting in F, G having an error with the point in time at which the traveling wave detected at point I arrives. The time points at which the travelling wave arrives at the individual substations are shown in table 4.
TABLE 4
| Transformer substation | Traveling wave arrival time/(mus) |
| A | 802.68 |
| B | 635.45 |
| C | 1137.12 |
| D | 401.34 |
| E | ****** |
| F | 538.12 |
| G | 688.90 |
| H | 1839.46 |
| I | 2180.47 |
| J | 2240.80 |
The fault point occurred between D and E, D being the target point and F, G, H, I, J, H being the reference point, and the relevant data are shown in table 5.
TABLE 5
The data in table 5 is substituted into equation (8), and finally a-0.2973 km/μ s and b-238.40 km are obtained.
I.e. a first distance D between the fault point and the target point DD＝119.20km。
Calculating error
e within an error range of 5% of the error threshold, i.e. the first spacing dD119.20km is the more accurate location.
Since the position of D is known in advance, according to DDThe specific geographical location of the failure point can be known.
According to actual measurement, the fault point is determined as a position with a distance of 120km from D.
Example four
The present example provides an apparatus for locating a fault point in an area network based on traveling waves, for performing the method for locating a fault point in an area network based on traveling waves of the foregoing embodiments.
Fig. 4 is a schematic structural diagram of an apparatus for locating a fault point in an area network based on traveling waves according to this embodiment. The device for positioning the fault point in the area network based on the traveling wave comprises the following components: a first acquisition unit 401, a second acquisition unit 402, a first determination unit 403, a second determination unit 404, a third determination unit 405 and a fourth determination unit 406.
The first obtaining unit 401 is configured to obtain a time point set if a fault point occurs on the power line, where the time point set includes a time point when a traveling wave corresponding to the fault point reaches each substation; the second obtaining unit 402 is configured to obtain a location set, where the location information set includes location information of each substation; the first determining unit 403 is configured to determine a substation from the area network as an initial target point; the second determining unit 404 is configured to determine a plurality of substations from the remaining substations as reference points corresponding to target points, through which the power lines between at least two reference points and the target points need to pass; the third determining unit 405 is configured to determine a first distance between the fault point and the target point according to the time point set, the position set, and the reference point; the fourth determination unit 406 is configured to determine a location of the failure point according to the first distance.
First determining section 403 may be connected to first acquiring section 401, and may use one of the power transformations that can acquire the arrival time of the traveling wave as a target point. The second determination unit 404 may determine the reference point from the target point determined by the first determination unit 403, together with the first determination unit 403. Alternatively, the first determining unit 403 may be connected to the third determining unit 405, and send the information of the target point to the third determining unit 405 directly, or send the information of the target point to the third determining unit 405 indirectly through the second determining unit 404.
Wherein the traveling wave may be a current traveling wave. For example, the time point when the traveling wave arrives at each substation is the time point when the wave head of the traveling wave arrives at each substation.
The working method of each unit of this embodiment is the same as that of the previous embodiment, and is not described herein again.
According to the device for positioning the fault point in the regional network based on the traveling wave, after the fault point of the power line is identified, the time of the traveling wave reaching a plurality of substations is obtained, an initial target point and a plurality of reference points are determined, and the position of the fault point is determined by combining the traveling wave time received by the substations, the position set of the substations and the reference points, so that the position of the fault point can be determined more accurately. In addition, the method of the embodiment does not determine the position of the fault point by determining the wave speed of the traveling wave, so that the condition that the final positioning result is inaccurate due to the possible change of the wave speed is avoided.
EXAMPLE five
The present embodiment provides a supplementary explanation for a device for locating a fault point in an area network based on traveling waves in the fourth embodiment.
Optionally, as shown in fig. 5A, the third determining unit 405 of this embodiment specifically includes a time determining subunit 4051, a first distance determining subunit 4052, and a second distance determining subunit 4053.
The time determining subunit 4051 is configured to determine, according to the set of time points, a time difference between the traveling wave reaching the target point and reaching each reference point; the first distance determining subunit 4052 is configured to determine, according to the position set, a second distance between the target point and each reference point; the second distance determining subunit 4053 is configured to determine the first distance between the failure point and the target point according to the time differences and the second distances.
The second determining unit 404 is specifically configured to: and taking the substations of the rest substations, which need to pass through the fault point, among the power lines between the target points as reference points.
The first determining unit 403 is specifically configured to: and determining one of the substations at two ends of the power line where the fault point is located as an initial target point.
Optionally, the second determined-distance subunit is specifically configured to:
the first distance b/2 between the fault point and the target point is determined according to the following formula:
wherein, XiRepresenting the time difference between the travelling wave arriving at the ith reference point and the travelling wave arriving at the target point, YiAnd a second distance between the ith reference point and the target point is represented, n represents the number of the reference points, i and n are positive integers, a represents the negative number of the wave speed of the traveling wave, and b is twice the first distance between the fault point and the target point.
Optionally, as shown in fig. 5B, the apparatus for locating a fault point in an area network based on a traveling wave of this embodiment further includes a correction unit 501, where the correction unit 501 is configured to determine another substation from the area network as an updated target point, and return to trigger the second determination unit 404 until another first distance between the fault point and the updated target point is determined;
the first distance b/2 between the fault point and the initial target point is corrected according to the following formula:
b/2 ═ 2 (first distance + third distance between two substations at both ends of the power line where the fault point is located — another first distance).
The initial target point may be one of the substations at both ends of the power line where the fault point is located, and the updated target point may be the other one of the substations at both ends of the power line where the fault point is located.
The working method of each unit of this embodiment is the same as that of the previous embodiment, and is not described herein again.
According to the embodiment, the first distance between the fault point and a target point is determined by adopting the traveling wave time received by a plurality of substations in the same regional network and the position set of the plurality of substations, and then the position of the fault point is determined according to the first distance, so that the position of the fault point can be determined more accurately.
EXAMPLE six
The embodiment provides another device for locating a fault point in an area network based on traveling waves, wherein the area network comprises a plurality of substations, and two adjacent substations are connected through a power line. As shown in fig. 6, an apparatus 600 for locating a failure point in an area network based on traveling waves includes at least one communication interface 601, at least one memory 602, and at least one processor 603.
At least one communication interface 601 is used for communicating with each substation; at least one memory 602 for storing location information of the substations; at least one processor 603 is connected to the communication interface 601 and the memory 602, and is configured to obtain the data sent by the communication interface 601 and the location information in the memory 602, and the processor 603 is configured to perform the method for locating a fault point in an area network based on a traveling wave according to the foregoing embodiments. The memory 602 may be provided in the processor 603 or may be provided separately.
For example, there may be two communication interfaces 601, one of which may be in communication with the traveling wave detection device for receiving the time point when the traveling wave corresponding to the fault point arrives at each substation. The location information in the memory 602 may be stored in advance. The processor 603 may perform the method for locating a fault point in an area network based on traveling waves in any of the embodiments described above.
According to the device for positioning the fault point in the regional network based on the traveling wave, after the fault point of the power line is identified, the time of the traveling wave reaching a plurality of substations is obtained, an initial target point is determined, and the position of the fault point is determined by combining the traveling wave time received by the plurality of substations in the same regional network and the position set of the plurality of substations, so that the position of the fault point can be determined more accurately. In addition, the method of the embodiment does not determine the position of the fault point by determining the wave speed of the traveling wave, so that the possibility that the final positioning result is inaccurate due to the possible change of the wave speed is avoided.
The invention also provides a device for positioning the fault point in the area network based on the traveling wave, which comprises at least one memory and at least one processor. Wherein the memory is to store instructions. The processor is configured to execute the method for locating a fault point in an area network based on traveling waves described in any of the foregoing embodiments according to instructions stored in the memory.
Embodiments of the present invention also provide a readable storage medium. The readable storage medium has stored therein machine readable instructions, which when executed by a machine, perform the method for locating a fault point in an area network based on traveling waves as described in any of the foregoing embodiments.
The readable medium has stored thereon machine readable instructions which, when executed by a processor, cause the processor to perform any of the methods previously described. In particular, a system or apparatus may be provided which is provided with a readable storage medium on which software program code implementing the functionality of any of the embodiments described above is stored and which causes a computer or processor of the system or apparatus to read and execute machine-readable instructions stored in the readable storage medium.
In this case, the program code itself read from the readable medium can realize the functions of any of the above-described embodiments, and thus the machine-readable code and the readable storage medium storing the machine-readable code form part of the present invention.
Examples of the readable storage medium include floppy disks, hard disks, magneto-optical disks, optical disks (e.g., CD-ROMs, CD-R, CD-RWs, DVD-ROMs, DVD-RAMs, DVD-RWs, DVD + RWs), magnetic tapes, nonvolatile memory cards, and ROMs. Alternatively, the program code may be downloaded from a server computer or from the cloud via a communications network.
It will be understood by those skilled in the art that various changes and modifications may be made in the above-disclosed embodiments without departing from the spirit of the invention. Accordingly, the scope of the invention should be determined from the following claims.
It should be noted that not all steps and units in the above flows and system structure diagrams are necessary, and some steps or units may be omitted according to actual needs. The execution order of the steps is not fixed and can be adjusted as required. The apparatus structures described in the above embodiments may be physical structures or logical structures, that is, some units may be implemented by the same physical entity, or some units may be implemented by a plurality of physical entities, or some units may be implemented by some components in a plurality of independent devices.
In the above embodiments, the hardware unit may be implemented mechanically or electrically. For example, a hardware unit or processor may comprise permanently dedicated circuitry or logic (such as a dedicated processor, FPGA or ASIC) to perform the corresponding operations. The hardware units or processors may also include programmable logic or circuitry (e.g., a general purpose processor or other programmable processor) that may be temporarily configured by software to perform the corresponding operations. The specific implementation (mechanical, or dedicated permanent, or temporarily set) may be determined based on cost and time considerations.
While the invention has been shown and described in detail in the drawings and in the preferred embodiments, it is not intended to limit the invention to the embodiments disclosed, and it will be apparent to those skilled in the art that various combinations of the code auditing means in the various embodiments described above may be used to obtain further embodiments of the invention, which are also within the scope of the invention.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. A method for locating a fault point in a regional network based on traveling waves, wherein the regional network comprises a plurality of substations, and two adjacent substations are connected through a power line, the method is characterized by comprising the following steps:
if a fault point of the power line is identified, acquiring a time point set, wherein the time point set comprises time points when a traveling wave corresponding to the fault point reaches each transformer substation;
acquiring a position set, wherein the position set comprises position information of each transformer substation;
determining a transformer substation from the area network as an initial target point;
determining a plurality of substations from the rest substations as reference points corresponding to the target points, wherein power lines between at least two reference points and the target points need to pass through the fault points;
determining a first distance between the fault point and the target point according to the time point set, the position set and the reference point;
determining the position of the fault point according to the first distance; determining a first distance between the fault point and the target point according to the set of time points, the set of locations, and the reference point comprises:
determining the time difference between the traveling wave reaching the target point and reaching each reference point according to the time point set;
determining a second distance between the target point and each reference point according to the position set;
determining a first distance between the fault point and the target point according to the time differences and the second distances;
the determining a first distance between the fault point and the target point according to the time differences and the second distances comprises:
determining a first distance b/2 between the fault point and the target point according to the following formula:
wherein, XiRepresenting the time difference between the arrival of said travelling wave at the ith said reference point and the arrival of said travelling wave at said target point, YiAnd representing a second distance between the ith reference point and the target point, n represents the number of the reference points, i and n are positive integers, a represents the negative number of the wave speed of the traveling wave, and b is twice the first distance between the fault point and the target point.
2. The method of claim 1, wherein determining a substation from the area network as an initial target point comprises:
and determining one of the substations at two ends of the power line where the fault point is located as an initial target point.
3. The method of claim 2, further comprising, after determining a first distance between the failure point and the target point based on each of the time differences and each of the second distances, and before determining the location of the failure point based on the first distance:
determining another substation from the area network as an updated target point, and returning to perform the operation of determining a plurality of reference points from the rest of the substations until another first distance between the fault point and the updated target point is determined;
correcting a first distance b/2 between the fault point and the initial target point according to the following formula:
b/2 ═ 2 (the first distance + a third distance between two substations at both ends of the power line where the fault point is located-the other first distance).
4. The method of claim 3, wherein the initial target point is one of the substations on both ends of the power line on which the fault point is located, and the updated target point is the other of the substations on both ends of the power line on which the fault point is located.
5. The method according to any of claims 1-4, wherein the travelling wave is a travelling current wave.
6. The method according to any of claims 1-4, characterized in that the point in time of arrival of the travelling wave at each substation is the point in time of arrival of the wave head of the travelling wave at each substation.
7. Device based on fault point in travelling wave location area network, area network includes a plurality of transformer substations, connects through a power line between two adjacent transformer substations, its characterized in that includes:
the first acquisition unit is used for acquiring a time point set if a fault point of the power line is identified, wherein the time point set comprises time points when a traveling wave corresponding to the fault point reaches each transformer substation;
a second obtaining unit, configured to obtain a location set, where the location set includes location information of each substation;
a first determining unit for determining a substation from the area network as an initial target point;
a second determination unit for determining a plurality of substations from the remaining substations as reference points corresponding to the target points, and the power lines between at least two of the reference points and the target points need to pass through the fault point;
a third determining unit, configured to determine a first distance between the fault point and the target point according to the time point set, the location set, and the reference point;
a fourth determining unit for determining the location of the fault point based on the first distance;
the third determining unit specifically includes:
a determining time subunit, configured to determine, according to the set of time points, a time difference between the traveling wave arriving at the target point and arriving at each of the reference points;
a first distance determining subunit, configured to determine a second distance between the target point and each of the reference points according to the position set;
a second distance determining subunit configured to determine a first distance between the failure point and the target point based on each of the time differences and each of the second distances;
the second determined-pitch subunit is specifically configured to:
determining a first distance b/2 between the fault point and the target point according to the following formula:
wherein, XiRepresenting the time difference between the arrival of said travelling wave at the ith said reference point and the arrival of said travelling wave at said target point, YiAnd representing a second distance between the ith reference point and the target point, n represents the number of the reference points, i and n are positive integers, a represents the negative number of the wave speed of the traveling wave, and b is twice the first distance between the fault point and the target point.
8. The apparatus according to claim 7, wherein the first determining unit is specifically configured to:
and determining one of the substations at two ends of the power line where the fault point is located as an initial target point.
9. The apparatus of claim 8, further comprising a correction unit for:
determining another substation from the area network as an updated target point, and returning to trigger the second determination unit until another first distance between the fault point and the updated target point is determined;
correcting a first distance b/2 between the fault point and the initial target point according to the following formula:
b/2 ═ 2 (the first distance + a third distance between two substations at both ends of the power line where the fault point is located-the other first distance).
10. The apparatus of claim 9, wherein the initial target point is one of the substations on both ends of the power line on which the fault point is located, and the updated target point is the other of the substations on both ends of the power line on which the fault point is located.
11. The apparatus of claim 7, wherein the traveling wave is a traveling current wave.
12. The apparatus of claim 7, wherein the point in time at which the traveling wave arrives at each substation is a point in time at which a wave head of the traveling wave arrives at each substation.
13. Device based on fault point in travelling wave location area network, area network includes a plurality of transformer substations, connects through a power line between two adjacent transformer substations, its characterized in that includes:
at least one communication interface for communicating with the respective substation;
at least one memory for storing location information of the substations;
at least one processor connected to the communication interface and the memory, and configured to obtain data sent by the communication interface and location information in the memory, wherein the processor is configured to perform the method for locating a fault point in an area network based on traveling waves according to any one of claims 1 to 6.
14. Device based on fault point in travelling wave location area network, area network includes a plurality of transformer substations, connects through a power line between two adjacent transformer substations, its characterized in that includes:
at least one memory for storing instructions;
at least one processor configured to perform the method of locating a point of failure in an area network based on traveling waves of any one of claims 1-6 according to the instructions stored by the memory.
15. Readable storage medium having stored thereon machine readable instructions which, when executed by a machine, perform the method for traveling wave based location of a point of failure in an area network according to any of claims 1-6.
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| CN111371587B (en) * | 2019-12-25 | 2022-07-12 | 长沙理工大学 | Layered power distribution network fault positioning system, method, server and equipment |
| CN112014686B (en) * | 2020-08-14 | 2022-07-05 | 国网河南省电力公司封丘县供电公司 | Low-voltage distribution network fault positioning method based on shortest path of adjacency matrix |
| CN113109668B (en) * | 2021-04-12 | 2022-12-20 | 国网陕西省电力公司西安供电公司 | Power distribution network asymmetric fault positioning method based on reclosing zero-mode traveling wave mutation |
| CN114878971B (en) * | 2022-05-31 | 2024-01-30 | 国网北京市电力公司 | Power distribution network fault point positioning method, device, equipment and medium |
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