Method and device for positioning fault point in regional network based on traveling wave
阅读说明：本技术 基于行波定位区域网络中故障点的方法与装置 (Method and device for positioning fault point in regional network based on traveling wave ) 是由 李新东 杜希霞 胡克 于 2018-03-16 设计创作，主要内容包括：本发明涉及基于行波定位区域网络中故障点的方法与装置,区域网络包括多个变电站,两个相邻的变电站之间通过一个电力线连接,方法包括：若识别出电力线出现一个故障点,则获取一个时间点集合,时间点集合中包括故障点对应的一个行波到达各变电站的时间点；获取一个位置集合,位置信息集合包括各变电站的位置信息；从区域网络中确定一个变电站作为初始的目标点；从余下的变电站中确定多个变电站作为与目标点对应的参考点,至少两个参考点与目标点之间的电力线需经过故障点；根据时间点集合、位置集合和参考点确定故障点与目标点的第一间距；根据第一间距确定故障点的位置。根据本发明,能够实现对故障点的精确定位。(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.)
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 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.
2. The method of claim 1, wherein determining the first distance between the fault point and the target point from 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.
3. 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.
4. The method of claim 3, 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).
5. The method of claim 4, wherein the initial target point is one of the substations at both ends of the power line at which the fault point is located, and the updated target point is the other of the substations at both ends of the power line at which the fault point is located.
6. The method according to any one of claims 2-5, wherein said determining a first distance between the fault point and the target point based on each of the time differences and each of 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.
7. The method according to any of claims 1-5, wherein the travelling wave is a travelling current wave.
8. The method according to any of claims 1-5, 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.
9. 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 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.
10. The apparatus according to claim 9, wherein 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.
11. The apparatus according to claim 9, 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.
12. The apparatus of claim 11, 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).
13. The apparatus of claim 12, 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.
14. The apparatus according to any of claims 9-13, wherein 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.
15. The apparatus of claim 9, wherein the traveling wave is a traveling current wave.
16. The apparatus of claim 9, 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.
17. 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 8.
18. 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 for traveling wave based localization of points of failure in an area network of any of claims 1-8 in accordance with instructions stored by the memory.
19. Readable storage medium having stored thereon 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 claims 1-8.
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.