CN103941150A - Zero-mode and line-mode time difference radiation net fault location method achieved only through voltage without relying on two-terminal synchronization - Google Patents
Zero-mode and line-mode time difference radiation net fault location method achieved only through voltage without relying on two-terminal synchronization Download PDFInfo
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Abstract
The invention provides a zero-mode and line-mode time difference radiation net fault location method achieved only through voltage without relying on two-terminal synchronization, and belongs to the technical field of electric power system relay protection. Traveling wave fault distance measurement devices are arranged on the two sides of a feeder line, and fault distance measurement is conducted through information on the two sides. After grounding faults happen to the feeder line of a power distribution network, line-mode traveling components propagated between wires and zero-mode traveling wave components propagated between the wires and the ground are generated due to the sudden change of the voltage at the fault point. Due to the fact that the line-mode propagation velocity and the zero-mode propagation velocity are different, the arrival moment of the line-mode initial traveling wave and the arrival moment of the zero-mode initial traveling wave detected by a measurement terminal are different. Moment calibration is conduced through the wavelet modulus maximum under the fifth dimension according to the initial line-mode voltage traveling wave data and the initial zero-mode voltage traveling wave data detected by the measurement device, and the fault distance is calculated according to the ground fault single-terminal traveling wave fault location calculation formula for the modulus transmission time difference. Fault location is conducted by integrating single-terminal modulus propagation time difference distance measurement information on the two sides.
Description
Technical field
The present invention relates to a kind of voltage that only utilizes and do not rely on both-end synchronous zero, line mould time difference radiation network Fault Locating Method, belong to Relay Protection Technology in Power System field.
Background technology
After electrical network breaks down, carry out fault localization and can alleviate artificial line walking workload, shorten fault correction time, improve power supply reliability, reduce loss of outage and find the hidden danger existing and processed as early as possible, prevent the generation again of fault.The method of fault localization can be divided into fault analytical method and traveling wave method by range measurement principle.The core of traveling wave method is to measure the travel-time computational scheme fault distance of row ripple between bus and trouble spot.Travelling wave ranging generally can be divided into Single Terminal Traveling Wave Fault Location and both-end travelling wave ranging two classes.Single Terminal Traveling Wave Fault Location does not need GPS to realize the synchronous of data, do not need to carry out two ends data communication yet, its cost is half of both-end travelling wave ranging cost, by single-ended method, carry out travelling wave ranging, because row ripple carries out catadioptric repeatedly in trouble spot and bus end, the wavefront that is reflected to the various character on measuring junction time shaft is staggered, and has brought great difficulty to the demarcation of trouble spot reflection wave due in, and Range finding reliability is difficult to guarantee.And both-end travelling wave ranging only requires that two bus ends accurately detect the moment that first wavefront arrives, therefore the method is subject to the impact of transition resistance arc characteristic, line distribution capacitance and load current less, compared with single-ended method, there is higher reliability, but need both-end data communication and GPS synchronously to time equipment, cost of investment is large.
Due to the general radiation networks that adopt of city power distribution system, it has closed loop design, open loop operation characteristic more, and singlephase earth fault probability is high, and technology and economic factors have comprehensively determined that multiple-limb radial distribution networks localization of fault has its singularity.For typical radial overhead feeder distribution system, there is many feedbacks outlet in bus, along feeder line, be connected to numerous branches and load change etc. simultaneously, feed out circuit length great disparity, after distribution line generation singlephase earth fault, the discontinuous node of wave impedance and load end points are many, the row ripple that trouble spot produces is in Nodes generation transmission, energy attenuation is stronger, and row ripple reflects at load end points and Nodes, increase the identification difficulty of measuring end to trouble spot reflection wave, made the extraction of free-running frequency more difficult, therefore seek other visual angles, carried out singlephase earth fault location.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of voltage that only utilizes and does not rely on both-end synchronous zero, line mould time difference radiation network Fault Locating Method, overcomes for multiple-limb radiation network single-ended traveling wave method trouble spot reflection wave wave head due in and demarcates difficulty and the high problem of both-end traveling wave method operating cost.
Technical scheme of the present invention is: a kind of voltage that only utilizes does not rely on both-end synchronous zero, line mould time difference radiation network Fault Locating Method, in multiple-limb radial networks, traveling wave fault location device is installed in feeder line both sides, is utilized the information of both sides to carry out respectively fault localization; After distribution feeder generation earth fault, due to line, zero mould velocity of propagation difference, the line, the zero mould initial row wave-wave that cause measuring end to detect are different to the moment, the initial line detecting according to measuring equipment, zero mode voltage row wave datum, utilize the Wavelet Modulus Maxima under the 5th yardstick to carry out moment demarcation, utilize the earth fault Single Ended Fault Location computing formula of modulus transmission time difference to calculate fault distance; Comprehensive both sides single-ended modulus propagation time difference ranging information is carried out localization of fault.
Concrete steps are:
(1) according to the actual feeder line parameter of the straight match system of overhead transmission line, fault distance is set along the line, emulation obtains the relation of outlet, zero mould wave velocity and discrete fault distance point, and recycling cubic spline interpolation draws line, the zero mould velocity of wave curve along total track length;
(2) utilize respectively line, the zero mode voltage traveling-wave component that the Wavelet Modulus Maxima under the 5th yardstick detects M, N measuring end to carry out moment demarcation, the mistiming that draws both is △
t m0,1, △
t n0,1;
(3) wave velocity of choosing feeder line midpoint, as initial velocity of wave iterative value, utilizes range finding formula to calculate primary fault distance
x f (0), by primary fault distance
x f (0)substitution line, zero mould interpolation curve carry out iteration, when the line mould velocity of wave of adjacent 2
v 1(
n)-
v 1(
n-1) <0.0001 and adjacent 2 s' zero mould velocity of wave
v 0(
n)-
v 0(
n-1), during <0.0001, termination of iterations is in conjunction with the △ trying to achieve
t m0,1, △
t n0,1, utilization formula
obtain respectively the distance between both sides M, N and trouble spot; If cannot meet the condition of convergence, change choosing until restrain of abort situation iterative initial value and corresponding primary wave speed thereof, finally draw the fault distance of convergence;
(4) utilize the fault localization information of both sides to carry out resultant fault location.
Principle of the present invention is: after distribution feeder generation earth fault, due to the cataclysm of fault point voltage, be created in the zero line wave component of propagating between the line line wave component propagated between wire and wire and the earth.Because distribution wire is short out and can not set up lightning conducter along the line, the propagation loss between wire of line line ripple is little, zero line ripple is propagated between the earth and wire, feed out circuit frequency dependent character large, cause zero each frequency component of mould to present otherness, but its initial row ripple is easy to detect, in the situation that the single-phase range finding of distribution is difficult, seek to utilize distance-finding method zero, the line mould time difference.
Due to line, zero mould velocity of propagation difference, the line, the zero mould initial row wave-wave that cause measuring end to detect are different to the moment, so the earth fault Single Ended Fault Location computing formula based on modulus transmission time difference is
(1)
Wherein, Δ
t 0,1be zero, line mould ripple is to the mistiming,
v 1,
v 0be respectively line, zero mould velocity of wave, Δ
v 1,0for line, zero mould velocity of wave poor.
The radiation network of multiple-limb shown in Fig. 1 topological structure of take is example, for improve distance accuracy herein sample frequency be chosen for 10MHz.Known under different faults distance, system generation Single Phase Metal earth fault, the line of 0.5ms, zero mode voltage data after extraction fault, utilize the Wavelet Modulus Maxima under the 5th yardstick to carry out moment demarcation, velocity of wave on the line calculating, 1 mould discrete distance point, carries out thereafter cubic spline interpolation and obtains along the line in circuit length range, zero mould velocity of wave curve as shown in Figure 2.As can be seen from Figure 2, during near terminal fault, line, zero mould velocity of wave conversion are acutely, and its general morphologictrend presents dullness under other fault distances except near-end, line, zero mould wave velocity no longer present funtcional relationship with distance, utilize cubic spline interpolation well to solve because of the excessive problem of wave velocity range error that Function Fitting causes, and can good faults distance and wave velocity relation between the two.Choose the wave velocity of feeder line midpoint as initial velocity of wave iterative value, utilize range finding formula to calculate primary fault distance
x f (0), by primary fault distance
x f (0)substitution line, zero mould interpolation curve carry out iteration, when the line mould velocity of wave of adjacent 2
v 1(
n)-
v 1(
n-1) <0.0001 and adjacent 2 s' zero mould velocity of wave
v 0(
n)-
v 0(
n-1), during <0.0001, termination of iterations is in conjunction with the line of trying to achieve, zero mould ripple arrival time difference Δ
t 0,1, utilization formula (1) is obtained the distance between M side and trouble spot.If cannot meet the condition of convergence, change choosing until restrain of abort situation iterative initial value and corresponding primary wave speed thereof, finally draw the fault distance of convergence.
Because distribution line is shorter, branch is many and present tree structure, generally adopts the single ended line zero poor localization method of mould velocity of wave can not identify branched line, can only calculate fault distance, and the general investment of both-end distance measuring is larger, local communication to time be difficult for realizing.Therefore this method adopts and carries out respectively one-end fault location at distribution line backbone two ends, thereby can reduce near-end range finding dead band and can further identify branch.
The invention has the beneficial effects as follows: only need single-ended initial wave head, without GPS exact time synchronization and the reflection identification of wave head and its, be not substantially subject to the impact of fault resistance, the initial phase angle of fault and take-off point.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention list outlet multiple-limb radiation network topological structure;
Fig. 2 is line, the zero mould velocity of wave that utilizes cubic spline interpolation to obtain;
Fig. 3 is that M side line, zero mode voltage row involve its modulus maximum.
Fig. 4 is that N side line, zero mode voltage row involve its modulus maximum.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Only utilize voltage not rely on both-end synchronous zero, a line mould time difference radiation network Fault Locating Method, in multiple-limb radial networks, traveling wave fault location device is installed in feeder line both sides, utilize the information of both sides to carry out respectively fault localization; After distribution feeder generation earth fault, due to line, zero mould velocity of propagation difference, the line, the zero mould initial row wave-wave that cause measuring end to detect are different to the moment, the initial line detecting according to measuring equipment, zero mode voltage row wave datum, utilize the Wavelet Modulus Maxima under the 5th yardstick to carry out moment demarcation, utilize the earth fault Single Ended Fault Location computing formula of modulus transmission time difference to calculate fault distance; Comprehensive both sides single-ended modulus propagation time difference ranging information is carried out localization of fault.
Concrete steps are:
(1) according to the actual feeder line parameter of the straight match system of overhead transmission line, fault distance is set along the line, emulation obtains the relation of outlet, zero mould wave velocity and discrete fault distance point, and recycling cubic spline interpolation draws line, the zero mould velocity of wave curve along total track length;
(2) utilize respectively line, the zero mode voltage traveling-wave component that the Wavelet Modulus Maxima under the 5th yardstick detects M, N measuring end to carry out moment demarcation, the mistiming that draws both is △
t m0,1, △
t n0,1;
(3) wave velocity of choosing feeder line midpoint, as initial velocity of wave iterative value, utilizes range finding formula to calculate primary fault distance
x f (0), by primary fault distance
x f (0)substitution line, zero mould interpolation curve carry out iteration, when the line mould velocity of wave of adjacent 2
v 1(
n)-
v 1(
n-1) <0.0001 and adjacent 2 s' zero mould velocity of wave
v 0(
n)-
v 0(
n-1), during <0.0001, termination of iterations is in conjunction with the △ trying to achieve
t m0,1, △
t n0,1, utilization formula
obtain respectively the distance between both sides M, N and trouble spot; If cannot meet the condition of convergence, change choosing until restrain of abort situation iterative initial value and corresponding primary wave speed thereof, finally draw the fault distance of convergence;
(4) utilize the fault localization information of both sides to carry out resultant fault location.
For single outlet multiple-limb radiation network as shown in Figure 1, the G in this electrical network is infinitely great power supply; T is main-transformer, no-load voltage ratio is 110 kV/35kV, and connection set is YN/d11, and measuring junction is M end, wherein basic routing line MB=20km, BC=15 km, CN=15 km, the BF=10 km of branch, CE=10km, install respectively one group of traveling wave fault location device at M and N end.
Embodiment 1: existing hypothesis is apart from M end 25km basic routing line generation single-phase earthing metal fault, the initial phase angle of fault is 90 °, emulation sample frequency is 10MHz, utilize respectively line, zero line wave component that the Wavelet Modulus Maxima under the 5th yardstick detects measuring end to carry out moment and demarcate, obtain that M, N two measure end lines, zero mode voltage row involves its modulus maximum demarcation as shown in Figure 3.Draw M side line, zero mould ripple to the mistiming be △
t m=0.0086ms, N side line, zero mould ripple to the mistiming be △
t n=0.0084ms, chooses the wave velocity of feeder line midpoint as initial velocity of wave iterative value, utilizes range finding formula
calculate primary fault distance
x f (0), by primary fault distance
x f (0)substitution line, zero mould interpolation curve carry out iteration, when the line mould velocity of wave of adjacent 2
v 1(
n)-
v 1(
n-1) <0.0001 and adjacent 2 s' zero mould velocity of wave
v 0(
n)-
v 0(
n-1), during <0.0001, termination of iterations is in conjunction with the △ trying to achieve
t m0,1, △
t n0,1, using range finding formula to calculate fault distance M-f is 24.72km, N-f is 24.26km, and comprehensive both sides fault distance information, providing abort situation is that 24.5km holds apart from M in backbone place.
Embodiment 2: existing hypothesis is apart from M end 25km branch 1 circuit generation single-phase earthing metal fault, the initial phase angle of fault is 50 °, fault resistance is 20 Ω, emulation sample frequency is 10MHz, utilize respectively line, zero line wave component that the Wavelet Modulus Maxima under the 5th yardstick detects measuring end to carry out moment and demarcate, obtain that M, N two measure end lines, zero mode voltage row involves its modulus maximum demarcation.Draw M side and N side line, zero mould ripple to the mistiming be △
t mand △
t n, choose the wave velocity of feeder line midpoint as initial velocity of wave iterative value, utilize range finding formula
calculate primary fault distance
x f (0), by primary fault distance
x f (0)substitution line, zero mould interpolation curve carry out iteration, when the line mould velocity of wave of adjacent 2
v 1(
n)-
v 1(
n-1) <0.0001 and adjacent 2 s' zero mould velocity of wave
v 0(
n)-
v 0(
n-1), during <0.0001, termination of iterations is in conjunction with the △ trying to achieve
t m0,1, △
t n0,1, using range finding formula to divide and calculating fault distance M-f is 24.79km, N-f is 36.41km, and comprehensive both sides fault distance information, providing abort situation is that 24.5km holds apart from M in branch line 1 place.
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make various variations.
Claims (2)
1. one kind is only utilized voltage not rely on both-end synchronous zero, line mould time difference radiation network Fault Locating Method, it is characterized in that: in multiple-limb radial networks, traveling wave fault location device is installed in feeder line both sides, is utilized the information of both sides to carry out respectively fault localization; After distribution feeder generation earth fault, due to line, zero mould velocity of propagation difference, the line, the zero mould initial row wave-wave that cause measuring end to detect are different to the moment, the initial line detecting according to measuring equipment, zero mode voltage row wave datum, utilize the Wavelet Modulus Maxima under the 5th yardstick to carry out moment demarcation, utilize the earth fault Single Ended Fault Location computing formula of modulus transmission time difference to calculate fault distance; Comprehensive both sides single-ended modulus propagation time difference ranging information is carried out localization of fault.
2. the voltage that only utilizes according to claim 1 does not rely on both-end synchronous zero, line mould time difference radiation network Fault Locating Method, it is characterized in that concrete steps are:
(1) according to the actual feeder line parameter of the straight match system of overhead transmission line, fault distance is set along the line, emulation obtains the relation of outlet, zero mould wave velocity and discrete fault distance point, and recycling cubic spline interpolation draws line, the zero mould velocity of wave curve along total track length;
(2) utilize respectively line, the zero mode voltage traveling-wave component that the Wavelet Modulus Maxima under the 5th yardstick detects M, N measuring end to carry out moment demarcation, the mistiming that draws both is △
t m0,1, △
t n0,1;
(3) wave velocity of choosing feeder line midpoint, as initial velocity of wave iterative value, utilizes range finding formula to calculate primary fault distance
x f (0), by primary fault distance
x f (0)substitution line, zero mould interpolation curve carry out iteration, when the line mould velocity of wave of adjacent 2
v 1(
n)-
v 1(
n-1) <0.0001 and adjacent 2 s' zero mould velocity of wave
v 0(
n)-
v 0(
n-1), during <0.0001, termination of iterations is in conjunction with the △ trying to achieve
t m0,1, △
t n0,1, utilization formula
obtain respectively the distance between both sides M, N and trouble spot; If cannot meet the condition of convergence, change choosing until restrain of abort situation iterative initial value and corresponding primary wave speed thereof, finally draw the fault distance of convergence;
(4) utilize the fault localization information of both sides to carry out resultant fault location.
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