CN102967803A - Fault positioning method of power distribution network based on D type traveling wave principle - Google Patents

Abstract

The invention provides a fault positioning method of a power distribution network based on a D type traveling wave principle. The fault positioning method of the power distribution network comprises the following steps: firstly, selecting a measuring point where the initial fault traveling wave arrives first as the reference measuring point; carrying out fault positioning at a plurality of times through the reference measuring point and other measuring points with the fault traveling wave signals received based on the D type traveling wave distance measuring principle; and thirdly, selecting the maximum value from the results of the plurality of fault positioning actions as the final fault positioning result. Compared with the conventional method, the fault positioning method of the power distribution network has the advantages that the fault section does not need to be determined, and the fault positioning of the whole power distribution network is directly carried out based on the D type traveling wave distance measuring principle, so that the accuracy and reliability in fault positioning can be improved; and once fault occurs in a circuit, little time is spent in finding out and determining the fault point, and therefore, the reliability in power supply is improved; and the fault positioning method of the power distribution network based on D type traveling wave principle has a wide application prospect.

Description

Electrical power distribution network fault location method based on the capable ripple principle of D type

Technical field

The invention belongs to the protecting electrical power system technical field, particularly a kind of electrical power distribution network fault location method based on the capable ripple principle of D type.

Background technology

Determine quickly and accurately the position of failure point of distribution line, can accelerate the reparation of permanent fault, in time remove a hidden danger to avoid the again generation of a large amount of transient faults, safety and stability and the economical operation that guarantees electric system is of great significance.

At present, the localization of fault of power distribution network has proposed several different methods both at home and abroad, mainly contains impedance method, S injection method, intelligent method, " fault detector " technology, FEEDER AUTOMATION and traveling wave method.Impedance method is subjected to the impact of line impedance, load and power parameter larger, and for the distribution line with multiple-limb, impedance method can't be got rid of pseudo-fault point.The finite energy of the Injection Signal of S injection method, if the trouble spot through very large resistance eutral grounding, perhaps the trouble spot is far apart from circuit top, so signal will be very faint can't Measurement accuracy.The intelligence method is subjected to the impact of knowledge base and network structure very large." fault detector " although that technology has obtained is practical, the result of use of earth-fault indicator is then not bery desirable, and accuracy is not high, usually not reaction during electrical network generation singlephase earth fault.FEEDER AUTOMATION can accurately not position fault, and the interval of localization of fault is subjected to the impact of feeder automation equipment packing density.

The traveling wave method principle can be divided into single-ended principle and both-end principle.Single-ended principle range finding utilizes the mistiming between reflection wave and the incident wave to calculate fault distance.Yet in power distribution network, because its branch is more, after fault occured, complicated catadioptric can occur in fault traveling wave in the line, can't distinguish the reflected traveling wave of trouble spot and circuit take-off point.The Single Terminal Traveling Wave Fault Location principle also is difficult to automatically provide correct range finding result at present, still can not use separately in power distribution network.Both-end principle range finding is the mistiming that arrives the circuit two ends by calculating fault traveling wave to calculate abort situation, and its distance accuracy is not subjected to the impact of the factors such as the abort situation, fault type, line length, stake resistance of circuit substantially.But theoretical analysis and practical application show that although the capable ripple principle of both-end can on-line automaticly provide the fault localization result, reliability and accuracy are subjected to the impact of given line length error and time dissemination system.When given line length existed larger error or time dissemination system malfunction, both-end principle range finding result was incredible.

Summary of the invention

The object of the present invention is to provide a kind of electrical power distribution network fault location method based on the capable ripple principle of D type that can overcome defects, be applicable to distribution line, its technical scheme is:

(1) choose the reference measure point: use i=1,2,3 ..., m ..., n represents to be positioned at the measurement point of each feeder terminal of power distribution network, T _iThe fault initial row ripple time that it received in the time synchronized situation when expression fault occured; Wherein m is the measurement point that fault initial row ripple arrives at first, and be T fault initial row ripple time of arrival that this point is corresponding _m, choosing this point is the reference measure point;

(2) preliminary localization of fault: choose after the reference measure point m, based on the capable ripple principle of D type, utilize respectively reference measure point and the measurement point i place routine calculation possible position of a distance of being out of order, namely the trouble spot arrive reference measure point apart from l _Ki:

L wherein _MiBe the line length that reference measure is put measurement point i, v is row ripple velocity of propagation in the line;

(3) the localization of fault result determines: from preliminary localization of fault result, choose maximal value and namely can be used as the accurate positioning result of final fault, namely the trouble spot to reference measure point apart from l _KmFor: l _Km=max(l _Ki).

Principle of work is: according to the failed row wave trajectory as can be known, when power distribution network breaks down, first fault traveling wave that the measurement point of each bar feeder terminal receives should be the fault initial row ripple that sends the trouble spot, corresponding to fault initial row ripple due in, and the measurement point of the nearest feeder terminal of distance fault point detects the initial travelling wave signal of fault at first in time precise synchronization situation.If take this measurement point as reference, based on the capable ripple principle of D type, the measurement point place circuit that utilizes respectively reference measure point and all the other to detect the initial travelling wave signal of fault can calculate the trouble spot to the potential range of reference measure point.Can find out according to row wave propagation process, the trouble spot is not when using the circuit of the capable ripple principle of D type, and its trouble spot that calculates is to the distance of reference measure point be bound to arrive less than the trouble spot that the trouble spot calculates when the circuit of the capable ripple principle of the utilization D type distance of reference measure point.Obviously, be exactly final trouble spot to reference measure point distance in all trouble spots that calculates to the maximal value in the distance of reference measure point.Like this, just realized the Travelling Wave Fault Location of power distribution network.

The present invention compared with prior art, its advantage is: can provide final localization of fault result by the both-end principle, can eliminate in the power distribution network branched line to the impact of single-ended principle localization of fault, calculate simple, the method high conformity, need not failure judgement branch, improved the localization of fault precision, improved largely reliability and the accuracy of power circuit Travelling Wave Fault Location.Behind line failure, need not the expensive time to get final product the localization of faults, improved power supply reliability, have a extensive future.

Description of drawings

Fig. 1 is the communication process synoptic diagram of fault transient travelling wave of the present invention in the power distribution network topological diagram.

Among the figure: 1 is the measurement point of power end, and the branch line length at its place is l ₁Measurement point 2, measurement point 3 ..., measurement point 13, measurement point 14 is the measurement point of each line end in the power distribution network, its place branch line length is respectively l ₂, l ₃..., l ₁₃, l ₁₄A, B, C ..., J, K are the take-off point of circuit, its adjacent 2 distances are respectively l _AB, l _BC..., l _IJ, l _JKS is the power supply access point, is respectively l apart from the distance of take-off point A and take-off point F _SAAnd l _SFK is the trouble spot; Direction of arrow representing fault initial row wave trajectory and the direction of propagation among the figure.

Embodiment

The present invention is made the following instructions with certain simulation example below in conjunction with accompanying drawing:

Embodiment 1: electric pressure is 10kV, and measurement point 1 is the measurement point of power end, and the branch line length at its place is l ₁=100m; Measurement point 2, measurement point 3, measurement point 4, measurement point 5, measurement point 6, measurement point 7, measurement point 8, measurement point 9, measurement point 10, measurement point 11, measurement point 12, measurement point 13, measurement point 14 is the measurement point of each line end in the power distribution network, its place branch line length is respectively l ₂=100m, l ₃=150m, l ₄=100m, l ₅=200m, l ₆=300m, l ₇=200m, l ₈=100m, l ₉=100m, l ₁₀=200m, l ₁₁=200m, l ₁₂=200m, l ₁₃=200m, l ₁₄=400m; A, B, C ..., J, K are the take-off point of circuit, its adjacent 2 distances are respectively l _AB=500m, l _BC=800m, l _CD=1500m, l _DE=1000m, l _FG=500m, l _GH=100m, l _GI=1500m, l _IJ=1000m, l _JK=100m; S is the power supply access point, is respectively l apart from the distance of take-off point A and take-off point F _SA=1500m and l _SF=500m; Actual fault point k is 50m to the distance of measurement point 2, the velocity of wave v=3 of row ripple in transmission line of electricity * 10 ⁸M/s.T=0.025s breaks down constantly.

Step 1, choose the reference measure point: after fault occured, the fault initial row ripple time that each measurement point receives in the time synchronized situation was: T ₁=25005.5 μ s, T ₂=25000.2 μ s, T ₃=25002.4 μ s, T ₄=25004.9 μ s, T ₅=25010.2 μ s, T ₆=25013.9 μ s, T ₇=25013.6 μ s, T ₈=25007.2 μ s, T ₉=25009.2 μ s, T ₁₀=25009.5 μ s, T ₁₁=25014.2 μ s, T ₁₂=25017.5 μ s, T ₁₃=25017.9 μ s, T ₁₄=25018.5 μ s; By the above measurement point that can find out that measurement point 2 arrives at first for fault initial row ripple, be T fault initial row ripple time of arrival that this point is corresponding ₂=25000.2 μ s are the reference measure point so select this point;

Step 2, preliminary localization of fault: choose measurement point 2 for after the reference measure point, based on the capable ripple principle of D type, utilize reference measure point and the measurement point 1 place routine calculation a little possible position of being out of order, namely the trouble spot arrive measurement point apart from l _K1: $l_{k1}=\frac{l_{21}+v(T_2-T_1)}{2}=\frac{l_1+l_2+l_{\mathrm{SA}}+v(T_2-T_1)}{2}=55m,$ L wherein ₂₁Reference measure point and measurement point 1 place line length; Fortune uses the same method and can utilize out reference measure to put other measurement point place routine calculations to be out of order a little and to be respectively to the distance of measurement point 2: l _K2=0m, l _K3=45m, l _K4=45m, l _K5=50m, l _K6=45m, l _K7=40m, l _K8=50m, l _K9=50m, l _K10=55m, l _K11=50m, l _K12=55m, l _K13=45m, l _K14=55m;

Step 3, localization of fault result are determined: from preliminary localization of fault result, choose maximal value and namely can be used as the accurate positioning result of final fault, namely the trouble spot to reference measure point apart from l _K2For: l _K2=max(l _Ki)=l _K1=55m, to be positioned at measurement point 2 and measurement point 1 place circuit be 55m to the distance of reference measure point in the trouble spot like this, compares with actual fault point, measuring error of the present invention is 5m.

Embodiment 2: electric pressure is 10kV, and measurement point 1 is the measurement point of power end, and the branch line length at its place is l ₁=100m; Measurement point 2, measurement point 3, measurement point 4, measurement point 5, measurement point 6, measurement point 7, measurement point 8, measurement point 9, measurement point 10, measurement point 11, measurement point 12, measurement point 13, measurement point 14 is the measurement point of each line end in the power distribution network, its place branch line length is respectively l ₂=100m, l ₃=150m, l ₄=100m, l ₅=200m, l ₆=300m, l ₇=200m, l ₈=100m, l ₉=100m, l ₁₀=200m, l ₁₁=200m, l ₁₂=200m, l ₁₃=200m, l ₁₄=400m; A, B, C ..., J, K are the take-off point of circuit, its adjacent 2 distances are respectively l _AB=500m, l _BC=800m, l _CD=1500m, l _DE=1000m, l _FG=500m, l _GH=100m, l _GI=1500m, l _IJ=1000m, l _JK=100m; S is the power supply access point, is respectively l apart from the distance of take-off point A and take-off point F _SA=1500m and l _SF=500m; It is 300m to the distance of measurement point 2 that actual fault point k is positioned at the AB section, velocity of wave v=3 * 10 ⁸M/s.T=0.025s breaks down constantly.

Step 1, choose the reference measure point: after fault occured, the fault initial row ripple time that each measurement point receives in the time synchronized situation was: T ₁=25006.0 μ s, T ₂=25001.0 μ s, T ₃=25001.5 μ s, T ₄=25004.0 μ s, T ₅=25009.4 μ s, T ₆=25013.0 μ s, T ₇=25012.7 μ s, T ₈=25007.7 μ s, T ₉=25009.7 μ s, T ₁₀=25010.0 μ s, T ₁₁=25014.7 μ s, T ₁₂=25018.0 μ s, T ₁₃=25018.4 μ s, T ₁₄=25019.0 μ s; By the above measurement point that can find out that measurement point 2 arrives at first for fault initial row ripple, be T fault initial row ripple time of arrival that this point is corresponding ₂=25001.0 μ s are the reference measure point so choose this point;

Step 2, preliminary localization of fault: choose measurement point 2 for after the reference measure point, based on the capable ripple principle of D type, utilize reference measure point and measurement point 1 place routine calculation be out of order a little possible position be the trouble spot arrive measurement point apart from l _K1: $l_{k1}=\frac{l_{21}+v(T_2-T_1)}{2}=\frac{l_1+l_2+l_{\mathrm{SA}}+v(T_2-T_1)}{2}=100m,$ L wherein ₂₁Measurement point 2 and measurement point 1 place line length; Fortune uses the same method and can utilize out reference measure to put other measurement point place routine calculations to be out of order a little and to be respectively to the distance of measurement point 2: l _K2=0m, l _K3=300m, l _K4=300m, l _K5=290m, l _K6=300m, l _K7=295m, l _K8=95m, l _K9=95m, l _K10=100m, l _K11=95m, l _K12=100m, l _K13=90m, l _K14=100m;

Step 3, localization of fault result are determined: from preliminary localization of fault result, choose maximal value and namely can be used as the accurate positioning result of final fault, namely the trouble spot to measurement point 2 apart from l _K2For: l _K2=max(l _Ki)=l _K3=300m, to be positioned at measurement point 2 and measurement point 3 place circuits be 300m to the distance of measurement point 2 in the trouble spot like this, compares with actual fault point, measuring error of the present invention is 0m.

Embodiment 3: electric pressure is 10kV, and 1 is the measurement point of power end, and the branch line length at its place is l ₁=100m; 2,3,4,5,6,7,8,9,10,11,12,13,14 is the measurement point of each line end in the power distribution network, and its place branch line length is respectively l ₂=100m, l ₃=150m, l ₄=100m, l ₅=200m, l ₆=300m, l ₇=200m, l ₈=100m, l ₉=100m, l ₁₀=200m, l ₁₁=200m, l ₁₂=200m, l ₁₃=200m, l ₁₄=400m; A, B, C ..., J, K are the take-off point of circuit, its adjacent 2 distances are respectively l _AB=500m, l _BC=800m, l _CD=1500m, l _DE=1000m, l _FG=500m, l _GH=100m, l _GI=1500m, l _IJ=1000m, l _JK=100m; S is the power supply access point, is respectively l apart from the distance of take-off point A and take-off point F _SA=1500m and l _SF=500m; Actual fault point k is positioned at take-off point B, the velocity of wave v=3 of row ripple in transmission line of electricity * 10 ⁸M/s.T=0.025s breaks down constantly.

Step 1, choose the reference measure point: after fault occured, the fault initial row ripple time that each measurement point receives in the time synchronized situation was: T ₁=25007.0 μ s, T ₂=25002.0 μ s, T ₃=25000.5 μ s, T ₄=25003.0 μ s, T ₅=25008.4 μ s, T ₆=25012.0 μ s, T ₇=25011.7 μ s, T ₈=25008.7 μ s, T ₉=25010.7 μ s, T ₁₀=25011.0 μ s, T ₁₁=25015.7 μ s, T ₁₂=25019.0 μ s, T ₁₃=25019.4 μ s, T ₁₄=25020.0 μ s; By the above measurement point that can find out that measurement point 3 arrives at first for fault initial row ripple, be T fault initial row ripple time of arrival that this point is corresponding ₃=25000.5 μ s are the reference measure point so choose this point;

Step 2, preliminary localization of fault: choose measurement point 3 for after the reference measure point, based on the capable ripple principle of D type, utilize reference measure point and measurement point 1 place routine calculation be out of order a little possible position be the trouble spot arrive measurement point 3 apart from l _K31: $l_{k31}=\frac{l_{31}+v(T_3-T_1)}{2}=\frac{l_1+l_3+l_{\mathrm{SA}}+l_{\mathrm{AB}}+v(T_3-T_1)}{2}=150m,$ L wherein ₃₁Measurement point 3 and measurement point 1 place line length; Fortune uses the same method and can utilize out reference measure to put other measurement point place routine calculations to be out of order a little and to be respectively to the distance of measurement point 3: l _K32=150m, l _K33=0m, l _K34=150m, l _K35=140m, l _K36=150m, l _K37=145m, l _K38=145m, l _K39=145m, l _K310=150m, l _K311=145m, l _K312=150m, l _K313=140m, l _K314=150m;

Step 3, localization of fault result are determined: from preliminary localization of fault result, choose maximal value and namely can be used as the accurate positioning result of final fault, namely the trouble spot to measurement point 3 apart from l _K3For: l _K3=max(l _K3i)=l _K31=150m, to be positioned at measurement point 3 and measurement point 1 place circuit be 150m to the distance of measurement point 3 in the trouble spot like this, compares with actual fault point, measuring error of the present invention is 0m.

Claims (1)

1. electrical power distribution network fault location method based on the capable ripple principle of D type is characterized in that adopting following steps:

(1) choose the reference measure point: use i=1,2,3 ..., m ..., n represents to be positioned at the measurement point of each feeder terminal of power distribution network, T _iThe fault initial row ripple time that it received in the time synchronized situation when expression fault occured; Wherein m is the measurement point that fault initial row ripple arrives at first, and be T fault initial row ripple time of arrival that this point is corresponding _m, choosing this point is the reference measure point;

(2) preliminary localization of fault: choose after the reference measure point m, based on the capable ripple principle of D type, utilize respectively reference measure point and the measurement point i place routine calculation possible position of a distance of being out of order, namely the trouble spot arrive reference measure point apart from l _Ki:

L wherein _MiBe the line length that reference measure is put measurement point i, v is row ripple velocity of propagation in the line;

(3) the localization of fault result determines: from preliminary localization of fault result, choose maximal value and namely can be used as the accurate positioning result of final fault, namely the trouble spot to reference measure point apart from l _KmFor: l _Km=max(l _Ki).