CN116754900B - Fault distance measurement method, system, medium and equipment for distribution network with multiple undetectable branches - Google Patents
Fault distance measurement method, system, medium and equipment for distribution network with multiple undetectable branches Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention relates to the technical field of distribution network fault location, and discloses a distribution network fault location method, a distribution network fault location system, a distribution network medium and distribution network fault location equipment with multiple undetectable branches, wherein the distribution network fault location method comprises the following steps: calculating to obtain the time difference between the line mode and the zero mode voltage wave head from the branch point to the two ends and the time difference between the line mode and the zero mode wave from the head end to the tail end; and obtaining voltage traveling wave signals of the head end and the tail end, calculating to obtain time difference between a line mode and a zero mode wave from a fault point to two ends, combining the time difference between the line mode and the zero mode wave from the head end to the tail end, calculating to obtain a first discrimination coefficient, judging whether the fault occurs in a main line or an undetectable branch line, if the fault occurs in the undetectable branch line, calculating a second discrimination coefficient for each undetectable branch line, judging which undetectable branch line the fault occurs in, and calculating the distance between the fault point and the branch point for the undetectable branch line with the fault. The distance measurement of the single-phase ground fault of the distribution network with the undetectable branches is realized.
Description
Technical Field
The invention relates to the technical field of distribution network fault location, in particular to a distribution network fault location method, a distribution network fault location system, a distribution network fault location medium and distribution network fault location equipment with multiple undetectable branches.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The construction of the distribution network is an important component directly related to the electricity consumption of users, and the distribution network fault positioning method is placed at a prominent position in the development process of the power system. The distribution network is distinguished from the transmission line and has the characteristics of complex line, more branches and more radial shape, so that fault location has higher complexity. Traditional distribution network fault location basically relies on manual inspection, wastes time and labor, and is low in efficiency. The high-efficiency and accurate fault positioning after the fault occurs can help to quickly find the position where the fault occurs and overhaul and remove the fault, and has great significance for quickly recovering the power operation and reducing the production loss. In recent years, a plurality of fault positioning methods are proposed, and the fault positioning method has wide application in a power system, but the fault positioning for a distribution network is not enough at present, and the fault positioning method has great practical significance in researching the distance measurement precision of the distribution network and rapidly determining fault points while reducing equipment investment as much as possible to a large extent because of the limitation of the complexity of the distribution network.
The frequency of single-phase earth faults of the power distribution network is high, and if the position of a fault point cannot be found out in time, the safe and stable operation of the power system can be endangered. The existing fault distance measurement method mainly aims at a distribution line with an actual measuring point, however, the topology of the distribution line is complex, a load branch is directly connected with the line in a T shape, and the system cannot detect the running state of the branch, so that the system is called as an undetectable branch, the voltage and the current of the undetectable branch are not measurable, the fault characteristic of the distribution network is more complex, and the accurate positioning of the fault point is more difficult due to the existence of the undetectable branch. In the existing positioning algorithm, the most common is a traveling wave method, and the time for the traveling wave at the fault point to reach the measuring end is used for calculating by matching with the traveling wave speed, but the method should be applied to an undetectable branch, and the traveling wave time on the undetectable branch cannot be acquired because no measuring point exists, so that the distance measurement of the single-phase ground fault of the distribution network with the undetectable branch cannot be performed.
Disclosure of Invention
In order to solve the problems, the invention provides a fault distance measuring method, a system, a medium and equipment for a distribution network with multiple undetectable branches, which are used for judging a fault section by utilizing the time difference between a fault line mode and a zero mode voltage wave reaching two ends of a fault line, and accurately calculating the fault distance by matching with the zero mode wave speed and the line mode wave speed, so as to realize the distance measurement of single-phase ground faults of the distribution network with the undetectable branches.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a first aspect of the present invention provides a fault location method for a distribution network including multiple undetectable branches, comprising:
the method comprises the steps of obtaining zero-mode wave speed and line-mode wave speed of upstream wave propagation of a fault line and distances from a head end and a tail end of the fault line to a branch point, and calculating to obtain time differences of line-mode and zero-mode voltage wave heads from the branch point to the head end, time differences of line-mode and zero-mode voltage wave heads from the branch point to the tail end and time differences of line-mode and zero-mode waves from the head end to the tail end;
acquiring voltage traveling wave signals of a head end and a tail end, calculating to obtain a time difference between a line mode and a zero mode wave from a fault point to the head end and a time difference between the line mode and the zero mode wave from the fault point to the tail end, and calculating to obtain a first discrimination coefficient by combining the time difference between the line mode and the zero mode wave from the head end to the tail end;
judging whether a fault occurs in a main line or an undetectable branch line based on a first discrimination coefficient, if the fault occurs in the undetectable branch line, calculating a difference value between a time difference between the line mode and zero mode voltage wave head from a branch point to a head end and a time difference between the line mode and zero mode voltage wave head from the branch point to the head end for each undetectable branch line to obtain a first difference value, calculating a difference value between the time difference between the line mode and zero mode wave from a fault point to a tail end and the time difference between the line mode and zero mode voltage wave head from the branch point to the tail end to obtain a second difference value, and taking a ratio of the first difference value to the second difference value as a second discrimination coefficient;
and judging which undetectable branch line is where the fault occurs based on the second discrimination coefficient, and calculating the distance between the fault point and the branch point based on the first difference value, the second difference value, the zero mode wave speed and the line mode wave speed for the undetectable branch line where the fault occurs.
Further, the time difference between the line mode and the zero mode voltage wave head from the branch point to the head end is as follows: subtracting the time from the branch point to the head end by the zero-mode voltage wave head;
the time from the branch point to the head end of the zero-mode voltage wave head is as follows: the ratio of the distance from the head end of the fault line to the branch point to the zero mode wave speed;
the time from the branch point to the head end of the line mode voltage wave head is as follows: and the ratio of the distance from the head end of the fault line to the branch point to the line mode wave speed.
Further, the time difference between the line mode and the zero mode voltage wave head from the branch point to the tail end is: subtracting the time from the branch point to the end of the line mode voltage wave head from the time from the branch point to the end of the zero mode voltage wave head;
the time from the branch point to the tail end of the zero-mode voltage wave head is as follows: the ratio of the distance from the fault line end to the branch point to the zero mode wave speed;
the time from the branch point to the tail end of the line mode voltage wave head is as follows: and the ratio of the distance from the tail end of the fault line to the branching point to the line mode wave speed.
Further, the time difference between the line mode and the zero mode wave from the head end to the tail end is as follows: and the sum of the time difference between the line mode and zero mode voltage wave head from the branch point to the head end and the time difference between the line mode and zero mode voltage wave head from the branch point to the tail end.
Further, the time difference between the line mode and the zero mode wave from the fault point to the head end is as follows: the difference between the abrupt time of the head-end zero-mode voltage traveling wave component and the abrupt point time of the head-end line-mode voltage traveling wave component;
the head-end zero-mode voltage traveling wave component and the head-end line-mode voltage traveling wave component are obtained by carrying out Kernel conversion on a head-end voltage traveling wave signal.
Further, the time difference between the line mode and the zero mode wave from the fault point to the tail end is as follows: the difference between the abrupt time of the end zero mode voltage traveling wave component and the abrupt point time of the end line mode voltage traveling wave component;
the tail end zero-mode voltage traveling wave component and the tail end line mode voltage traveling wave component are obtained by carrying out Kernel conversion on a tail end voltage traveling wave signal.
Further, if the fault occurs in the main line, the distance from the head end to the fault point is: l (L) mf =t mf ×（V 0 -V 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Alternatively, if the fault occurs in the main line, the end-to-fault point distance is: l (L) mf =t nf ×（V 0 -V 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein t is mf T is the time difference between the line mode and the zero mode wave from the fault point to the head end nf V is the time difference between the line mode and the zero mode wave from the fault point to the tail end 0 And V 1 Zero mode wave velocity and line mode respectivelyWave speed.
A second aspect of the present invention provides a fault location system for a distribution network including multiple undetectable branches, comprising:
a first computing module configured to: the method comprises the steps of obtaining zero-mode wave speed and line-mode wave speed of upstream wave propagation of a fault line and distances from a head end and a tail end of the fault line to a branch point, and calculating to obtain time differences of line-mode and zero-mode voltage wave heads from the branch point to the head end, time differences of line-mode and zero-mode voltage wave heads from the branch point to the tail end and time differences of line-mode and zero-mode waves from the head end to the tail end;
a second computing module configured to: acquiring voltage traveling wave signals of a head end and a tail end, calculating to obtain a time difference between a line mode and a zero mode wave from a fault point to the head end and a time difference between the line mode and the zero mode wave from the fault point to the tail end, and calculating to obtain a first discrimination coefficient by combining the time difference between the line mode and the zero mode wave from the head end to the tail end;
a first discrimination module configured to: judging whether a fault occurs in a main line or an undetectable branch line based on a first discrimination coefficient, if the fault occurs in the undetectable branch line, calculating a difference value between a time difference between the line mode and zero mode voltage wave head from a branch point to a head end and a time difference between the line mode and zero mode voltage wave head from the branch point to the head end for each undetectable branch line to obtain a first difference value, calculating a difference value between the time difference between the line mode and zero mode wave from a fault point to a tail end and the time difference between the line mode and zero mode voltage wave head from the branch point to the tail end to obtain a second difference value, and taking a ratio of the first difference value to the second difference value as a second discrimination coefficient;
a second discrimination module configured to: and judging which undetectable branch line is where the fault occurs based on the second discrimination coefficient, and calculating the distance between the fault point and the branch point based on the first difference value, the second difference value, the zero mode wave speed and the line mode wave speed for the undetectable branch line where the fault occurs.
A third aspect of the present invention provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps in a method for fault location of a distribution network comprising multiple undetectable branches as described above.
A fourth aspect of the invention provides a computer device comprising a memory, a processor and a computer program stored on the memory and running on the processor, the processor implementing the steps in a fault location method for a distribution network comprising multiple undetectable branches as described above when the program is executed.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a fault distance measurement method for a distribution network with multiple undetectable branches, which utilizes the time difference between the fault line mode and the zero mode voltage wave reaching the two ends of a fault line to judge the fault section, and accurately calculates the fault distance by matching with the zero mode wave speed and the line mode wave speed, thereby realizing the distance measurement of single-phase grounding faults of the distribution network with the undetectable branches, and the required equipment is single without adding other equipment cost.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a flow chart of a method for fault location of a distribution network with multiple undetectable branches according to a first embodiment of the present invention;
fig. 2 is a topology of a power distribution network according to a first embodiment of the present invention;
FIG. 3 is a simplified diagram of a circuit including an undetectable branch fault according to a first embodiment of the present invention;
fig. 4 is a time chart of traveling wave generated from a branching point by a line reaching both ends according to the first embodiment of the present invention;
FIG. 5 is a timing chart of traveling waves generated by faults on a main line reaching both ends according to the first embodiment of the present invention;
fig. 6 is a timing chart of traveling waves generated by faults on the non-measurable branches reaching both ends according to the first embodiment of the present invention.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The embodiments of the present invention and features of the embodiments may be combined with each other without conflict, and the present invention will be further described with reference to the drawings and embodiments.
Example 1
An objective of the first embodiment is to provide a fault location method for a distribution network with multiple undetectable branches.
According to the fault location method for the distribution network with multiple undetectable branches, provided by the embodiment, the fault points are judged for the second time through the traveling wave detection devices at the two ends, and then the fault information is utilized to accurately locate the fault points. It is possible to determine whether the fault point occurs on the main line or on an undetectable branch and to give accurate positioning.
As shown in fig. 2, one end of an AC power supply (AC) is grounded, the other end is connected to yy-mode transformers, the yy-mode transformers are respectively connected to the head ends (M ends) of the lines L1, L2 and L3, the yy-mode transformers are also respectively grounded directly and through arc suppression coils, the tail ends (N ends) of the lines L1, L2 and L3 are respectively connected to AC load1, AC load2 and AC load3 through load step-down transformers, the tail end (N end) of the line L3 is also connected with the head end of the line L4, the tail end (N end) of the line L4 is connected with an alternating current load4 through a load step-down transformer, the load step-down transformers are all grounded, 4 undetectable branch lines S1K1, S2K2, S3K3, S4K4 are arranged on the connecting line L1, S2, S3 and S4 represent undetectable branch points, K1, K2, K3 and K4 are corresponding undetectable branch tail end nodes, and the embodiment uses SiKi to represent an ith undetectable branch line; the simplified block diagram containing only non-measurable branch lines is shown in fig. 3, which includes the installation of traveling wave acquisition devices. The fault location method for the distribution network with multiple undetectable branches provided in this embodiment, as shown in fig. 1, includes the following steps:
step 1, converting an electric transformation in a phase domain system into a non-coupling mode domain system by adopting Kernel transformation, and calculating the time difference of propagation of zero mode and line mode waves from a branch point to two sides of a line respectively according to the distance from the undetectable branch point to two ends of the line; according to the first wave head time difference between the zero mode and the line mode acquired at two sides of the line during actual fault, calculating a first fault distinguishing coefficient K1, and judging whether the fault occurs on the main line or the branch line according to the first distinguishing coefficient K1. The method comprises the following specific steps:
step 101: the topology of the actual distribution network with the non-measurable branches is simplified, as shown in fig. 3, wherein L1 is a fault line (including a main line and a plurality of non-measurable branches), M end is a fault line head end, N end is a fault line tail end, and two ends M, N are provided with traveling wave signal measuring devices, the device has a real-time communication function, and can obtain voltage traveling wave signals (voltage traveling wave signals of the main line head end and tail end) U of a measuring point m 、U n The method comprises the steps of carrying out a first treatment on the surface of the The S1K1, S2K2, S3K3 and S4K4 circuits are non-measurable branch circuits, no traveling wave measuring device exists on the circuits, and S1, S2, S3 and S4 points are non-measurable branch points on the fault circuit;
step 102: obtaining line parameters on a fault line and zero-mode inductance L 0 Zero mode capacitance C 0 Line mould inductance L 1 Line mode capacitor C 1 Calculating zero mode wave velocity V of traveling wave propagation on fault line by using the parameter 0 Wave speed V of linear mode 1 The relation between the wave speed and the line parameter is as follows:，/>because the line mode and the zero mode parameters are different, the speeds of the line mode component and the zero mode component of the fault traveling wave in the transmission process are also different; the zero mode parameter of the line is far greater than the line mode parameter; so that the wave velocity of the linear mode component is generally larger than that of the zero mode component, namely V 1 >V 0 ；
Step 103: such asAs shown in fig. 4, the distances from the head end M and the tail end N of the faulty line to the undetectable branch point Si are respectively L for the MN line (main line) and the branch line SiKi msi 、L nsi Wherein i represents the branch point number, due to V 1 >V 0 The arrival time of the zero-mode line mode wave head sensed by the travelling wave measuring point is different; using the zero mode wave velocity V obtained in step 102 0 Wave speed V of linear mode 1 And L msi 、L nsi Calculating the time point of the line mode voltage wave head propagating from the Si point to the M pointTime of zero-mode voltage wave head propagating from branch point Si to M end +.>Time point of propagation of line mode voltage wave head from Si point to N point +.>Time of zero-mode voltage wave head propagating from branch point Si to N-terminal +.>Calculating the time difference between the propagation of the line mode voltage wave head and the zero mode voltage wave head (line mode and zero mode voltage wave head) from the Si point to the M point +.>Time difference between line mode voltage wave head and zero mode voltage wave head propagating from Si point to N point +.>The method comprises the steps of carrying out a first treatment on the surface of the Sequentially calculating the time difference of the zero mode line mode components of the voltage traveling wave at each point of branch points S1, S2, S3 and S4 to the two ends by using the method;
step 104: by using the calculated time in step 103, the difference (the time difference between the line mode and the zero mode from the head to the tail) t of the time required for the line mode zero mode wave to propagate from the M end to the N end respectively can be calculated mn = t ms1 + t ns1 =t ms2 + t ns2 = t ms3 + t ns3 = t ms4 + t ns4 That is, the difference between the time of propagation of the linear mode wave from the M-terminal to the N-terminal and the time of propagation of the zero mode wave from the M-terminal to the N-terminal is t mn = t msi + t nsi ；
Step 105: when a fault occurs, the voltage signal measured by the M, N end is uploaded to a server to perform three-phase voltage signal U m 、U n The Kernel conversion is carried out to obtain zero-mode voltage component and line-mode voltage component, and zero-mode component U at M end m0 Line modulus component U m1 Performing multi-resolution singular value decomposition, extracting high-frequency component of voltage traveling wave, and obtaining voltage traveling wave head, as shown in FIG. 5 (wherein f A →G represents occurrence of single-phase ground fault), to obtain time point t when zero-mode voltage traveling wave component first reaches to cause mutation (i.e. mutation time point of M-terminal zero-mode voltage traveling wave component) mc0 And a time t when the first traveling wave of the line mode voltage traveling wave component arrives to cause mutation (namely, M-end line mode voltage traveling wave component mutation point time) mc1 The same method is adopted for the N end, and a time point t (namely, a mutation time point of the N end zero mode voltage traveling wave component) of mutation caused when the first wave head of the N end zero mode voltage traveling wave component arrives is obtained nc0 And a time point t at which the first wave head of the line mode voltage traveling wave component reaches to cause mutation (namely, the time of the mutation point of the N-end line mode voltage traveling wave component) nc1 ；
Step 106: calculating the traveling wave time difference of the zero mode line mode voltage at each end by using the time points obtained in the step 105, wherein the zero mode wave speed is lower than the line mode wave speed, and the line mode wave will arrive first, and the time difference between the propagation of the line mode wave from the fault point to the M end and the propagation of the zero mode wave from the fault point to the M end (short for the time difference of the M end or the time difference between the line mode and the zero mode wave from the fault point to the head end) is t mc =t mc0 -t mc1 The time difference between the propagation of the line mode wave from the fault point to the N end and the propagation of the zero mode wave from the fault point to the N end (the time difference of the N end for short, or the time difference of the line mode wave and the zero mode wave from the fault point to the tail end) is t nc =t nc0 -t nc1 ；
Step 107 when a fault occurs on the main line, no matter where the fault occurs, due toThe distance of traveling wave traveling on the main line is unchanged, and the sum of time differences of traveling waves from fault points to two sides is always equal, so that a first fault discrimination coefficient K1= (t) is defined mc +t nc )/t mn If the fault occurs on the main line, K1 will be equal to 1, if the fault occurs on the non-measurable branch, K1 will be greater than 1;
step 108: calculating a first fault discrimination coefficient, considering a measurement error, when the first fault discrimination coefficient K1 meets 0.95< K1<1.05, considering that the fault occurs on a main road, entering step 201, calculating an accurate fault position, when the first fault discrimination coefficient K1>1.05, considering that the fault occurs on an unmeasurable branch, entering step 202, and further judging on which section of unmeasurable branch the fault occurs.
And 2, aiming at the section where the fault point is primarily judged, according to the judging result, if the fault occurs on the main line, calculating the accurate fault position, and if the fault occurs on the undetectable branch, calculating a second judging coefficient, and judging the branch line. The method comprises the following specific steps:
step 201: the first failure discrimination coefficient K1 satisfies 0.95<K1<1.05, the fault occurs on the main line, the fault point is transmitted to the zero mode component of the fault voltage traveling wave line mode of the M end, and the time difference from the fault point to the M end is t mf =t mc The distance from the M end to the fault point is calculated as follows: l (L) mf =t mf ×（V 0 -V 1 ) The method comprises the steps of carrying out a first treatment on the surface of the The fault point is transmitted to zero mode component of fault voltage traveling wave line mode of N end, and the time difference from the fault point to N end is t nf =t nc The distance from the N end to the fault point is calculated as follows: l (L) nf =t nf ×（V 0 -V 1 ) If L mf +L nf =L mn If the fault point is correctly measured, otherwise, step 105 is carried out to re-measure;
step 202: the first failure discrimination coefficient K1 does not satisfy 0.95<K1<1.05, then the fault occurs on the non-measurable branch, and a determination of the non-measurable branch line will be made. As shown in FIG. 6, when a fault occurs in an undetectable branch, the branch point is Si, and adjacent branch points are Sj and S, respectivelyk, the distance of traveling wave propagating from the fault point to the M end propagating from the fault point to the branch point Si is L FSi Similarly, the distance travelled by the traveling wave propagating from the fault point to the N-terminal from the fault point to the branch point Si is L FSi Therefore, the zero-mode line mode wave time difference t calculated from the M end fsi Should be equal to t calculated from the N-terminal fsi Equal, but the time difference t of adjacent branch points j, k calculated by the M end fsj 、t fsk T to the adjacent branch point j calculated from the N-terminal fsj 、t fsk The difference is large;
step 203: defining the second discrimination coefficient as K2 i =（t mc -t msi ）/（t nc -t nsi ) Wherein i represents the number of the undetectable branch point; calculating a second discrimination coefficient for each branch point, when a fault occurs in a branch line (a branch line which is not measurable), the second discrimination coefficient K2 at the branch point of the line i The second discrimination coefficient calculated by the branch point of the fault, which is equal to 1, is not equal to 1;
step 204: in consideration of measurement errors, when a certain branch point fails, the second discrimination coefficient K2 i Satisfy 0.95<K2 i <1.05, then a fault is considered to occur on the undetectable branch line; simultaneously calculating the accurate position of the fault point; when the fault occurs on the SiKi of the non-measurable branch, the zero mode component of the fault voltage traveling wave line mode transmitted to the M end reaches the branch point Si from the fault point, and the time difference is t mks =t mc -t msi The fault point is transmitted to zero mode component of the fault voltage traveling wave line mode at the N end, and the time difference from the fault point to the branch point Si is t nks =t nc -t nsi Calculating the distance L between the fault point and the branching point by using the wave velocity of the branch line fs =（t mks +t nks ）/2×（V 0 -V 1 ) The time difference calculated at M, N is averaged to reduce the range error.
According to the fault location method for the distribution network with multiple undetectable branches, single-phase grounding fault accurate location of the distribution network with the multiple undetectable branches is carried out based on voltage traveling waves, first, line parameters are extracted, zero-mode capacitance inductance of a line outgoing mode is calculated, and the fault is calculatedCalculating the time difference required by the zero mode traveling wave of the line mode on the barrier line to be transmitted to two ends from the fault point respectively according to the zero mode wave speed of the line mode on the barrier line and the position of each unmeasurable branch point; then, for the voltage traveling wave signal extracted during fault, karenbo transformation is adopted to extract the voltage zero-mode line mode component, multi-resolution singular value decomposition is carried out on the zero-mode line mode, the traveling wave mutation time is obtained, the first fault discrimination coefficient K1 is calculated, whether the fault point occurs on a main line is judged, if the fault point occurs on the main line, the calculation is directly carried out, and if the fault point occurs on an undetectable branch, the second discrimination coefficient K2 is calculated at each branch point i And determining the branch line where the fault is located, and calculating the accurate fault distance.
In order to perfect that when a line of the distribution network with multiple undetectable branches fails, the fault location method for the distribution network with multiple undetectable branches provided by the embodiment can locate the fault point accurately in time, the single-phase earth fault location of the distribution network with multiple undetectable branches is performed based on traveling waves, the problem that the conventional fault location algorithm is difficult to find and locate the faults of the distribution network in time and accurately is solved, the required equipment is single, other equipment cost is not needed, the fault section judgment is performed for the first time by utilizing the time difference that the fault zero-mode line-mode voltage wave reaches two ends of the line, and the fault distance is calculated accurately by matching with the wave speed obtained by calculating the fault line parameters.
Example two
An object of the second embodiment is to provide a fault location system for a distribution network including multiple undetectable branches, including:
a first computing module configured to: the method comprises the steps of obtaining zero-mode wave speed and line-mode wave speed of upstream wave propagation of a fault line and distances from a head end and a tail end of the fault line to a branch point, and calculating to obtain time differences of line-mode and zero-mode voltage wave heads from the branch point to the head end, time differences of line-mode and zero-mode voltage wave heads from the branch point to the tail end and time differences of line-mode and zero-mode waves from the head end to the tail end;
a second computing module configured to: acquiring voltage traveling wave signals of a head end and a tail end, calculating to obtain a time difference between a line mode and a zero mode wave from a fault point to the head end and a time difference between the line mode and the zero mode wave from the fault point to the tail end, and calculating to obtain a first discrimination coefficient by combining the time difference between the line mode and the zero mode wave from the head end to the tail end;
a first discrimination module configured to: judging whether a fault occurs in a main line or an undetectable branch line based on a first discrimination coefficient, if the fault occurs in the undetectable branch line, calculating a difference value between a time difference between the line mode and zero mode voltage wave head from a branch point to a head end and a time difference between the line mode and zero mode voltage wave head from the branch point to the head end for each undetectable branch line to obtain a first difference value, calculating a difference value between the time difference between the line mode and zero mode wave from a fault point to a tail end and the time difference between the line mode and zero mode voltage wave head from the branch point to the tail end to obtain a second difference value, and taking a ratio of the first difference value to the second difference value as a second discrimination coefficient;
a second discrimination module configured to: and judging which undetectable branch line is where the fault occurs based on the second discrimination coefficient, and calculating the distance between the fault point and the branch point based on the first difference value, the second difference value, the zero mode wave speed and the line mode wave speed for the undetectable branch line where the fault occurs.
It should be noted that, each module in the embodiment corresponds to each step in the first embodiment one to one, and the implementation process is the same, which is not described here.
Example III
The present embodiment provides a computer readable storage medium having stored thereon a computer program, the program being executed by a processor, the program when executed by the processor implementing the steps in the fault location method for a distribution network including multiple undetectable branches as described in the above embodiment one.
Example IV
The present embodiment provides a computer device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor executes the program to implement the steps in the fault location method for a distribution network including multiple undetectable branches as in the foregoing embodiment.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
While the foregoing description of the embodiments of the present invention has been presented in conjunction with the drawings, it should be understood that it is not intended to limit the scope of the invention, but rather, it is intended to cover all modifications or variations within the scope of the invention as defined by the claims of the present invention.
Claims (7)
1. The fault distance measurement method for the distribution network with multiple undetectable branches is characterized by comprising the following steps:
the method comprises the steps of obtaining zero-mode wave speed and line-mode wave speed of upstream wave propagation of a fault line and distances from a head end and a tail end of the fault line to a branch point, and calculating to obtain time differences of line-mode and zero-mode voltage wave heads from the branch point to the head end, time differences of line-mode and zero-mode voltage wave heads from the branch point to the tail end and time differences of line-mode and zero-mode waves from the head end to the tail end; the fault line comprises a main line and a plurality of non-measurable branch lines;
the time difference between the line mode and the zero mode wave from the head end to the tail end is as follows: the sum of the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the head end and the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the tail end;
the method comprises the steps of obtaining voltage traveling wave signals of a head end and a tail end, and calculating to obtain a time difference between a line mode and a zero mode from a fault point to the head end and a time difference between the line mode and the zero mode from the fault point to the tail end, wherein the time difference between the line mode and the zero mode from the fault point to the head end is as follows: the difference between the abrupt change time caused by the arrival of the first wave head of the head-end zero-mode voltage traveling wave component and the abrupt change point time caused by the arrival of the first wave head of the head-end line-mode voltage traveling wave component;
the head-end zero-mode voltage traveling wave component and the head-end line-mode voltage traveling wave component are obtained by carrying out Kernel conversion on a head-end voltage traveling wave signal;
the time difference between the line mode and the zero mode wave from the fault point to the tail end is as follows: a difference between a time of abrupt change caused by arrival of a first wave head of the end zero-mode voltage traveling wave component and a time of abrupt change caused by arrival of a first wave head of the end line-mode voltage traveling wave component;
the tail end zero-mode voltage traveling wave component and the tail end line-mode voltage traveling wave component are obtained by carrying out Kernel conversion on a tail end voltage traveling wave signal;
and combining the time difference between the linear mode and the zero mode wave from the head end to the tail end to calculate and obtain a first discrimination coefficient K1;
the first discrimination coefficient is: k1 = (t mc +t nc )/t mn ；
Wherein t is mc The time difference between the transmission of the line mode wave from the fault point to the head end of the fault line and the transmission of the zero mode wave from the fault point to the head end of the fault line is given; t is t nc The time difference between the propagation of the line mode wave from the fault point to the fault line end and the propagation of the zero mode wave from the fault point to the fault line end is given; t is t mn The difference between the time of the line mode wave propagating from the head end of the fault line to the tail end of the fault line and the time of the zero mode wave propagating from the head end of the fault line to the tail end of the fault line;
based on the first discrimination coefficient, judging whether the fault occurs in the main line or the undetectable branch line, specifically: when the first discrimination coefficient K1 meets 0.95< K1<1.05, a fault occurs on the main line; when the first discrimination coefficient K1 is more than 1.05, the fault occurs on the undetectable branch line; if the faults occur in the undetectable branch lines, calculating the difference value between the time difference between the line mode voltage wave head and the zero mode voltage wave head from the fault point to the head end and the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the head end for each undetectable branch line to obtain a first difference value, calculating the difference value between the time difference between the line mode voltage wave head and the zero mode voltage wave head from the fault point to the tail end and the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the tail end to obtain a second difference value, and taking the ratio of the first difference value to the second difference value as a second discrimination coefficient;
based on the second discrimination coefficient, judging which undetectable branch line the fault occurs in, specifically: when the second discrimination coefficient of a certain branching point is more than 0.95 and less than 1.05, the fault occurs on the undetectable branching line; and calculating the distance between the fault point and the branch point based on the first difference value, the second difference value, the zero mode wave speed and the line mode wave speed for the undetectable branch line with the fault.
2. The fault location method for a distribution network comprising multiple undetectable branches according to claim 1, wherein the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branching point to the head end is: subtracting the time from the branch point to the head end by the zero-mode voltage wave head;
the time from the branch point to the head end of the zero-mode voltage wave head is as follows: the ratio of the distance from the head end of the fault line to the branch point to the zero mode wave speed;
the time from the branch point to the head end of the line mode voltage wave head is as follows: and the ratio of the distance from the head end of the fault line to the branch point to the line mode wave speed.
3. The fault location method for a distribution network comprising multiple undetectable branches according to claim 1, wherein a time difference between the line mode and the zero mode voltage wave head from the branching point to the end is: subtracting the time from the branch point to the end of the line mode voltage wave head from the time from the branch point to the end of the zero mode voltage wave head;
the time from the branch point to the tail end of the zero-mode voltage wave head is as follows: the ratio of the distance from the fault line end to the branch point to the zero mode wave speed;
the time from the branch point to the tail end of the line mode voltage wave head is as follows: and the ratio of the distance from the tail end of the fault line to the branching point to the line mode wave speed.
4. The method for fault location of a distribution network comprising multiple undetectable branches according to claim 1, wherein if the fault occurs in a main line, the distance from the head end to the fault point is: l (L) mf =t mf ×（V 0 -V 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Alternatively, if the fault occurs in the main line, the end-to-fault point distance is: l (L) mf =t nf ×（V 0 -V 1 ) The method comprises the steps of carrying out a first treatment on the surface of the Wherein t is mf T is the time difference between the line mode and the zero mode wave from the fault point to the head end nf V is the time difference between the line mode and the zero mode wave from the fault point to the tail end 0 And V 1 Zero mode wave speed and line mode wave speed, respectively.
5. Contain many undetectable branch distribution network fault location system, its characterized in that includes:
a first computing module configured to: the method comprises the steps of obtaining zero-mode wave speed and line-mode wave speed of upstream wave propagation of a fault line and distances from a head end and a tail end of the fault line to a branch point, and calculating to obtain time differences of line-mode and zero-mode voltage wave heads from the branch point to the head end, time differences of line-mode and zero-mode voltage wave heads from the branch point to the tail end and time differences of line-mode and zero-mode waves from the head end to the tail end; the fault line comprises a main line and a plurality of non-measurable branch lines;
the time difference between the line mode and the zero mode wave from the head end to the tail end is as follows: the sum of the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the head end and the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the tail end;
a second computing module configured to: the method comprises the steps of obtaining voltage traveling wave signals of a head end and a tail end, and calculating to obtain a time difference between a line mode and a zero mode from a fault point to the head end and a time difference between the line mode and the zero mode from the fault point to the tail end, wherein the time difference between the line mode and the zero mode from the fault point to the head end is as follows: the difference between the abrupt change time caused by the arrival of the first wave head of the head-end zero-mode voltage traveling wave component and the abrupt change point time caused by the arrival of the first wave head of the head-end line-mode voltage traveling wave component;
the head-end zero-mode voltage traveling wave component and the head-end line-mode voltage traveling wave component are obtained by carrying out Kernel conversion on a head-end voltage traveling wave signal;
the time difference between the line mode and the zero mode wave from the fault point to the tail end is as follows: a difference between a time of abrupt change caused by arrival of a first wave head of the end zero-mode voltage traveling wave component and a time of abrupt change caused by arrival of a first wave head of the end line-mode voltage traveling wave component;
the tail end zero-mode voltage traveling wave component and the tail end line-mode voltage traveling wave component are obtained by carrying out Kernel conversion on a tail end voltage traveling wave signal;
and combining the time difference between the linear mode and the zero mode wave from the head end to the tail end to calculate and obtain a first discrimination coefficient; the first discrimination coefficient is: k1 = (t mc +t nc )/t mn ；
Wherein t is mc The time difference between the transmission of the line mode wave from the fault point to the head end of the fault line and the transmission of the zero mode wave from the fault point to the head end of the fault line is given; t is t nc The time difference between the propagation of the line mode wave from the fault point to the fault line end and the propagation of the zero mode wave from the fault point to the fault line end is given; t is t mn The difference between the time of the line mode wave propagating from the head end of the fault line to the tail end of the fault line and the time of the zero mode wave propagating from the head end of the fault line to the tail end of the fault line;
a first discrimination module configured to: based on the first discrimination coefficient, judging whether the fault occurs in the main line or the undetectable branch line, specifically: when the first discrimination coefficient K1 meets 0.95< K1<1.05, a fault occurs on the main line; when the first discrimination coefficient K1 is more than 1.05, the fault occurs on the undetectable branch line; if the faults occur in the undetectable branch lines, calculating the difference value between the time difference between the line mode voltage wave head and the zero mode voltage wave head from the fault point to the head end and the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the head end for each undetectable branch line to obtain a first difference value, calculating the difference value between the time difference between the line mode voltage wave head and the zero mode voltage wave head from the fault point to the tail end and the time difference between the line mode voltage wave head and the zero mode voltage wave head from the branch point to the tail end to obtain a second difference value, and taking the ratio of the first difference value to the second difference value as a second discrimination coefficient;
a second discrimination module configured to: based on the second discrimination coefficient, judging which undetectable branch line the fault occurs in, specifically: when the second discrimination coefficient of a certain branching point is more than 0.95 and less than 1.05, the fault occurs on the undetectable branching line; and calculating the distance between the fault point and the branch point based on the first difference value, the second difference value, the zero mode wave speed and the line mode wave speed for the undetectable branch line with the fault.
6. A computer readable storage medium having stored thereon a computer program, the program being executed by a processor, characterized in that the program when executed by the processor implements the steps of the fault location method for a distribution network comprising multiple unmeasurable branches as claimed in any one of claims 1 to 4.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor, when executing the program, implements the steps of the distribution network fault location method comprising multiple undetectable branches as claimed in any one of claims 1 to 4.
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