CN103323744B - Method for locating cable fault inside wind power plant - Google Patents

Method for locating cable fault inside wind power plant Download PDF

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Publication number
CN103323744B
CN103323744B CN201310244174.8A CN201310244174A CN103323744B CN 103323744 B CN103323744 B CN 103323744B CN 201310244174 A CN201310244174 A CN 201310244174A CN 103323744 B CN103323744 B CN 103323744B
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measured value
fault
wind
blower fan
serial
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CN103323744A (en
Inventor
樊潇
周建
许卫东
卢永魁
郑春强
王海东
黄玲玲
魏书荣
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Shandong Electric Power Engineering Consulting Institute Corp Ltd
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Shandong Electric Power Engineering Consulting Institute Corp Ltd
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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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • 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 discloses a method for locating a cable fault inside a wind power plant. The method includes the steps of determining a fan bunch where the cable fault is by detecting the measured value of a fan outlet CT and the measured value of a transformer substation low voltage side CT in each bunch-type structure inside the wind power plant firstly, then detecting the measured value of the CT at the position of each fan outlet in a fault bunch, and further judging that in which section a fault point is located according to the relationship between the current value of each fan outlet and a distance from each fan outlet to a transformer substation. The method has the advantages that the fault can be judged by using the measured value of the existing fan outlet CT and the measured value of the existing transformer substation low voltage side CT under the condition that extra hardware equipment and extra hardware investment are not added, the scheme is feasible, and the method is convenient to implement.

Description

A kind of method of wind energy turbine set inside cable localization of fault
Technical field
The present invention relates to the Fault Locating Method of the inner current collection network cable of a kind of wind energy turbine set, particularly relate to a kind of when not increasing additional hardware equipment, the fault of wind energy turbine set inside cable is positioned.
Background technology
Current wind energy turbine set inside cable Fault Locating Method has a variety of, but all there is certain shortcoming, is now analyzed as follows:
1. current, many companies are proposed cable fault locator.The traveling wave method that cable fault locator on market adopts usually, by launching sinusoidal signal on cable, contrasting with the waveform fed back, judging whether to break down and position with this.But this kind of method needs additionally to increase hardware device, and positioning precision is limited.
2. or on cable line install direction protection additional, once break down, then the electric current on cable there will be oppositely, judges whether fault by direction of current, but the method also needs the relevant device additionally increasing line direction protection.
Summary of the invention
Object of the present invention is exactly that provide a kind of method of wind energy turbine set inside cable localization of fault, it has the advantage not increasing extra hardware device and can position cable fault in order to solve the problem.
To achieve these goals, the present invention adopts following technical scheme:
A method for wind energy turbine set inside cable localization of fault, comprises the following steps:
Step (1) detects the CT measured value of fan outlet and the CT measured value failure judgement string of substation low-voltage side in the inner every bar serial type structure of wind energy turbine set;
In step (2) detection failure string, the measured value of every Fans exit CT, obtains the magnitude relationship between the CT measured value of wind turbine exit;
The magnitude relationship of step (3) according to wind turbine outlet CT measured value and the distribution situation of the cable distance apart from electrical network, to the localization of fault of cable.
Described CT is current transformer.
Described determines whether that the method for syndrome serial is as follows:
(1) if meet formula: it is then syndrome serial;
(2) if meet formula: it is then non-faulting string;
Wherein: wind energy turbine set is with the low-pressure side of two-way cable line access primary substation, and a route road is a string;
M is total number of units of wind energy turbine set inner blower;
B is the number of units of wind energy turbine set internal fault string blower fan, and n represents variable;
for the current value that wind turbine exit CT in wind energy turbine set measures;
for substation low-voltage side is often being got lines crossed the measured value of road CT;
for the short-circuit current of fault point.
Pass in described syndrome serial between the CT measured value of wind turbine exit is:
Cable resistance between wind power generating set impedance >> system side impedance > blower fan;
in syndrome serial away from the blower fan of grid side from trouble spot more away from electric current less;
in syndrome serial near the blower fan of grid side from trouble spot more away from electric current less;
Wherein: system refers to the network system that wind-powered electricity generation place is accessed; One of bifurcated a Fans (1≤a≤b) is not had in syndrome serial; Trouble spot is positioned near f, (f+1) # blower fan; for the current value of the not wind turbine exit CT measurement of bifurcated in syndrome serial; Z wTfor the impedance of wind power generating set.
The Fault Locating Method of described syndrome serial inner cable is:
According to the size of the measured value of fan outlet CT and the range distribution of wind turbine distance electrical network, in syndrome serial, away from grid side blower fan from trouble spot more away from electric current less, near grid side blower fan from trouble spot more away from electric current less, according to the monotone decreasing relation of electric current, can judge trouble spot is between which two Fans.
Beneficial effect of the present invention:
1. the measured value utilizing existing wind electric field blower to export CT and substation low-voltage side CT carrys out failure judgement;
2. need not increase extra hardware device;
3. need not increase extra hardware investment;
4. it is convenient to realize.
Accompanying drawing explanation
Fig. 1 is typical wind energy turbine set cut-away view;
Fig. 2 is the first situation of the relation between current value and cable distance that in syndrome serial, every Fans exit CT measures.
Fig. 3 is the second situation of the relation between current value and cable distance that in syndrome serial, every Fans exit CT measures.
Fig. 4 is the third situation of the relation between current value and cable distance that in syndrome serial, every Fans exit CT measures.
Wherein, 1# ~ m# is wind turbine numbering in wind energy turbine set, for the current value that wind turbine exit CT in wind energy turbine set measures, for substation low-voltage side is often being got lines crossed the measured value of road CT; for the short-circuit current of fault point.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
A method for wind energy turbine set inside cable localization of fault, comprises the following steps:
Step (1) detects the CT measured value of fan outlet and the CT measured value failure judgement string of substation low-voltage side in the inner every bar serial type structure of wind energy turbine set;
In step (2) detection failure string, the measured value of every Fans exit CT, obtains the magnitude relationship between the CT measured value of wind turbine exit;
The magnitude relationship of step (3) according to wind turbine outlet CT measured value and the distribution situation of the cable distance apart from electrical network, to the localization of fault of cable.
As Fig. 1, give typical wind energy turbine set cut-away view, inner for wind energy turbine set current collection network is connected with the form of string usually, connection string is divided into syndrome serial and non-faulting string, non-faulting string i.e. normal string may have many strings, as long as be normal string, result of determination is consistent, therefore using a string non-faulting string as explanation.
According to typical blower fan and transformer parameter, there is following known conditions:
Blower fan impedance perunit value: X WT = 0.2 × 0.69 2 3.6 / 0.95 × 100 0.69 2 = 5.8479
Box type transformer impedance perunit value in blower fan: X T 1 = 10 % × 0.69 2 4.1 × 100 0.69 2 = 2.439
Circuit unit impedance perunit value:
The cross-section of cable R/km L/km Z/km
50 0.387 0.4018 0.03159+j0.010299
70 0.268 0.3865 0.02187+j0.009907
95 0.193 0.3735 0.01575+j0.009574
120 0.153 0.3637 0.01249+j0.009323
150 0.124 0.354 0.01012+j0.009074
185 0.0991 0.3456 0.00809+j0.008859
240 0.0754 0.3365 0.006155+j0.008625
300 0.0601 0.328 0.004906+j0.008408
400 0.047 0.3256 0.003837+j0.008346
Step-up transformer impedance perunit value: (main-transformer (2))
X T = 14 % × 35 2 170 × 100 35 2 = 0.0823
R T = 442 × 35 2 170 × 170 × 100 35 2 = 0.001529
Grid side, converts according to 220kV side 40kA short-circuit current, and conversion is to 35kV side impedance perunit value:
X S = 220 3 × 40 × 100 220 2 = 0.006561
Can obtain: the impedance Z of wind power generating set wT=5.8479+2.439 ≈ about 8.25, extra large cable impedance about 0.03 between blower fan, system side impedance: about 0.08
Conclusion 1:
Extra large cable impedance between wind power generating set impedance >> system side impedance > blower fan
According to kirchhoff electric current theorem:
Faulty line: Σ n = 1 12 I n · - I L 1 · = I k · ≠ 0
Non-fault line: Σ n = 13 22 I n · - I L 2 = 0 ·
Here one have 22 Fans in false wind electric field, syndrome serial has 12 Fans, and the part one of the not bifurcated at place, trouble spot has 8 Fans, and non-faulting string has 10 Fans.All calculating be all for trouble spot 4, the calculating carried out between 5# blower fan.I.e. m=22, b=12, a=8, f=4.
Can by detecting fan outlet CT and substation low-voltage side CT measured value failure judgement string in every bar serial type structure.
Calculate the current value in every Fans exit in syndrome serial below more respectively.
I 4 · = 1 Z WT + Z 4 k / / ( Z E / / Z WT + Z 34 )
= 1 Z WT + Z 4 k ( Z E * Z WT Z E + Z WT + Z 34 ) Z 4 k + Z E * Z WT Z E + Z WT + Z 34 = 1 Z WT + Z 4 k Z E Z WT + Z 4 k Z 34 Z E + Z 4 k Z 34 Z WT Z 4 k Z E + Z 4 k Z WT + Z E Z WT + Z 34 Z E + Z 34 Z WT
= Z 4 k Z E + Z 4 k Z WT + Z E Z WT + Z 34 Z WT + Z 34 Z E Z 4 k Z E Z WT + Z 34 Z E Z WT + Z 4 k Z E Z WT + Z 4 k Z 34 Z E + Z 4 k Z 34 Z WT + Z 4 k Z WT 2 + Z E Z WT 2 + Z 34 Z WT 2
≈ 3 Z 4 k Z WT 2 + Z WT 2 2 + 3 Z 34 Z WT 2 2 Z 4 k Z WT 2 + 3 Z 34 Z WT 2 2 + Z WT 2 2 ≈ 1 Z WT
I 3 · = 1 Z WT + Z E / / ( Z 4 k / / Z WT + Z 34 )
= 1 Z WT + Z E ( Z 4 k * Z WT Z 4 k + Z WT + Z 34 ) Z E + Z 4 k * Z WT Z 4 k + Z WT + Z 34 = 1 Z WT + Z 4 k Z E Z WT + Z 4 k Z 34 Z E + Z E Z 34 Z WT Z 4 k Z E + Z E Z WT + Z 4 k Z WT + Z 34 Z 4 k + Z 34 Z WT
= Z 4 k Z E + Z 4 k Z WT + Z E Z WT + Z 34 Z WT + Z 34 Z 4 k Z 4 k Z E Z WT + Z E Z 34 Z WT + Z 4 k Z E Z WT + Z 4 k Z 34 Z E + Z 34 Z 4 k Z WT + Z 4 k Z WT 2 + Z E Z WT 2 + Z 34 Z WT 2
≈ 3 Z 4 k Z WT 2 + Z WT 2 2 + Z 34 Z WT 3 Z 4 k Z WT 2 + 3 Z 34 Z WT 2 2 + Z WT 3 2 ≈ 1 Z WT
I 4 · - I 3 · = Z 34 ( Z E - Z 4 k ) Z 4 k Z E Z WT + Z 34 Z E Z WT + Z 4 k Z E Z WT + Z 4 k Z 34 Z E + Z 4 k Z 34 Z WT + Z 4 k Z WT 2 + Z E Z WT 2 + Z 34 Z WT 2
= Z 34 Z WT 2 3 Z 4 k Z WT 2 + 3 Z 34 Z WT 2 2 + Z WT 3 2 = Z 34 6 Z 4 k Z WT + 3 Z 34 Z WT + Z WT 2 ≈ Z 34 Z WT 2
Z E = Z 23 + Z WT / / ( Z WT + Z 12 )
= Z 23 + Z WT ( Z WT + Z 12 ) 2 Z WT + Z 12
≈ Z WT 2
Z 4k＝0～Z 45
I 3 · = 1 Z WT + Z 3 k / / ( Z E / / Z WT + Z 23 )
= 1 Z WT + Z 3 k ( Z E * Z WT Z E + Z WT + Z 23 ) Z 3 k + Z E * Z WT Z E + Z WT + Z 23 = 1 Z WT + Z 3 k Z E Z WT + Z 3 k Z 23 Z E + Z 3 k Z 23 Z WT Z 3 k Z E + Z 3 k Z WT + Z E Z WT + Z 23 Z E + Z 23 Z WT
= Z 3 k Z E + Z 3 k Z WT + Z E Z WT + Z 23 Z E + Z 23 Z WT 2 Z 3 k Z E Z WT + Z E Z 23 Z WT + Z 3 k Z 23 Z E + Z 3 k Z 23 Z WT + Z 3 k Z WT 2 + Z E Z WT 2 + Z 23 Z WT 2
I 2 · = 1 Z WT + Z E / / ( Z 3 k / / Z WT + Z 23 )
= 1 Z WT + Z E ( Z 3 k * Z WT Z 3 k + Z WT + Z 23 ) Z E + Z 3 k * Z WT Z 3 k + Z WT + Z 23 = 1 Z WT + Z 3 k Z E Z WT + Z 3 k Z 23 Z E + Z E Z 23 Z WT Z 3 k Z E + Z 3 k Z WT + Z E Z WT + Z 23 Z 3 k + Z 23 Z WT
= Z 3 k Z E + Z 3 k Z WT + Z E Z WT + Z 23 Z 3 k + Z 23 Z WT 2 Z 3 k Z E Z WT + Z E Z 23 Z WT + Z 3 k Z 23 Z E + Z 3 k Z 23 Z WT + Z 3 k Z WT 2 + Z E Z WT 2 + Z 23 Z WT 2
≈ 2 Z 3 k Z WT + Z WT 2 + Z 23 Z WT 3 Z 3 k Z WT 2 + 2 Z 23 Z WT 2 + Z WT 3 ≈ 1 Z WT + Z WT / / Z 3 k
I 3 · - I 2 · = Z 23 ( Z E - Z 3 k ) 2 Z 3 k Z E Z WT + Z E Z 23 Z WT + Z 3 k Z 23 Z E + Z 3 k Z 23 Z WT + Z 3 k Z WT 2 + Z E Z WT 2 + Z 23 Z WT 2
= Z 23 Z WT 3 Z 3 k Z WT 2 + 2 Z 23 Z WT 2 + 2 ( Z 34 + Z 4 k ) Z 23 Z WT + Z WT 3 ≈ Z 23 3 Z 3 k Z WT + 2 Z 23 Z WT + Z WT 2 ≈ Z 23 Z WT 2
Z E＝Z WT+Z 12
≈Z WT
Z 3 k = Z 4 k / / Z WT + Z 34 = Z 4 k Z WT Z WT + Z 4 k + Z 34 ≈ Z 34 + Z 4 k
I 1 · ≈ 1 Z WT
I 1 · = 1 Z WT + Z 12 + Z WT / / Z k = 1 Z WT + Z 12 + Z WT Z k Z WT + Z k
= Z WT + Z k Z WT 2 + 2 Z WT Z k + Z 12 Z WT + Z 12 Z k
I 2 · = 1 Z WT + ( Z 12 + Z WT ) / / Z k = 1 Z WT + ( Z 12 + Z WT ) Z k Z 12 + Z WT + Z k
= Z 12 + Z WT + Z k Z WT 2 + 2 Z WT Z k + Z 12 Z WT + Z 12 Z k
I 2 · - I 1 · = Z 12 Z WT 2 + 2 Z WT Z k + Z 12 Z WT + Z 12 Z k ≈ Z 12 Z WT 2
Conclusion 2:
Away from grid side blower fan from trouble spot more away from electric current less:
I 5 · = 1 Z WT + Z 5 k / / ( Z E / / Z WT + Z 56 )
= 1 Z WT + Z 5 k ( Z E * Z WT Z E + Z WT + Z 56 ) Z 5 k + Z E * Z WT Z E + Z WT + Z 56 = 1 Z WT + Z 5 k Z E Z WT + Z 5 k Z 56 Z E + Z 56 Z 5 k Z WT Z 5 k Z E + Z 5 k Z WT + Z E Z WT + Z 56 Z E + Z 56 Z WT
= Z 5 k Z E + Z 5 k Z WT + Z E Z WT + Z 56 Z E + Z 56 Z WT 2 Z 5 k Z E Z WT + Z E Z 56 Z WT + Z 5 k Z 56 Z E + Z 5 k Z 56 Z WT + Z 5 k Z WT 2 + Z E Z WT 2 + Z 56 Z WT 2 ≈ 1 Z WT + ( Z ES + Z ks ) / / Z k
I 6 · = 1 Z WT + ( Z 5 k / / Z WT + Z 56 ) / / Z E
= 1 Z WT + Z E ( Z 5 k * Z WT Z 5 k + Z WT + Z 56 ) Z E + Z 5 k * Z WT Z 5 k + Z WT + Z 56 = 1 Z WT + Z 5 k Z E Z WT + Z 5 k Z 56 Z E + Z 56 Z E Z WT Z 5 k Z E + Z 5 k Z WT + Z E Z WT + Z 56 Z 5 k + Z 56 Z WT
= Z 5 k Z E + Z 5 k Z WT + Z E Z WT + Z 56 Z 5 k + Z 56 Z WT 2 Z 5 k Z E Z WT + Z E Z 56 Z WT + Z 5 k Z 56 Z E + Z 5 k Z 56 Z WT + Z 5 k Z WT 2 + Z E Z WT 2 + Z 56 Z WT 2
I 6 · - I 5 · = Z 56 ( Z 5 k - Z E ) 2 Z 5 k Z E Z WT + Z E Z 56 Z WT + Z 5 k Z 56 Z E + Z 5 k Z 56 Z WT + Z 5 k Z WT 2 + Z E Z WT 2 + Z 56 Z WT 2
≈ Z 56 ( Z 5 k - Z E ) Z 5 k Z WT 2 + Z E Z WT 2 + Z 56 Z WT 2
Z E＝((Z S//Z L2+Z 8s)//(Z E9-12)//Z WT+Z 78)//Z WT+Z 67
≈((Z S+Z 8s)//Z WT//Z WT+Z 78)//Z WT+Z 67
≈Z S+Z 6-s
I 6 · = 1 Z WT + Z 6 k / / ( Z E / / Z WT + Z 67 )
= Z 6 k Z E + Z 6 k Z WT + Z E Z WT + Z 67 Z E + Z 67 Z WT 2 Z 6 k Z E Z WT + Z E Z 67 Z WT + Z 6 k Z 67 Z E + Z 6 k Z 67 Z WT + Z 6 k Z WT 2 + Z E Z WT 2 + Z 67 Z WT 2 ≈ 1 Z WT + ( Z ES + Z ks ) / / Z k
I 7 · = 1 Z WT + ( Z 6 k / / Z WT + Z 67 ) / / Z E
= Z 6 k Z E + Z 6 k Z WT + Z E Z WT + Z 67 Z 6 k + Z 67 Z WT 2 Z 6 k Z E Z WT + Z E Z 67 Z WT + Z 6 k Z 67 Z E + Z 6 k Z 67 Z WT + Z 6 k Z WT 2 + Z E Z WT 2 + Z 67 Z WT 2
I 7 · - I 6 · = Z 67 ( Z 6 k - Z E ) 2 Z 6 k Z E Z WT + Z E Z 67 Z WT + Z 6 k Z 67 Z E + Z 6 k Z 67 Z WT + Z 6 k Z WT 2 + Z E Z WT 2 + Z 67 Z WT 2
≈ Z 67 ( Z 6 k - Z E ) Z 6 k Z WT 2 + Z E Z WT 2 + Z 67 Z WT 2
Z E＝((Z S//Z L2+Z 8s)//(Z E9-12)//Z WT+Z 78)//Z WT+Z 67
≈((Z S+Z 8s)//Z WT//Z WT+Z 78)//Z WT+Z 67
≈Z S+Z 7-s＞Z 6k
Z 6 k = Z 5 k / / Z WT + Z 56 = Z 5 k Z WT Z WT + Z 5 k + Z 56 ≈ Z 56 + Z 5 k
Conclusion 3:
Near grid side blower fan from trouble spot more away from electric current less:
Large conclusion:
Syndrome serial: Σ n = 1 12 I n · - I L 1 · = I k · ≠ 0
Non-faulting string: Σ n = 13 22 I n · - I L 2 · = 0
First by detecting fan outlet CT and substation low-voltage side CT measured value failure judgement string in the inner every bar serial type structure of wind energy turbine set.
And then judge cable fault place (likely occurring three kinds of situations) by the value of Fans exit CT every in syndrome serial, as shown in Figure 2.
According to the measured value of Fans exit CT every in detection failure string and its apart from transformer station distance between relation, which section can be positioned at by further failure judgement point.If the first situation in Fig. 2, then trouble spot is positioned near 4# blower fan; If the second situation in Fig. 2, then trouble spot is between 4# blower fan and 5# blower fan; If the third situation in Fig. 2, then trouble spot is positioned near 5# blower fan.

Claims (3)

1. a method for wind energy turbine set inside cable localization of fault, is characterized in that, comprises the following steps:
Step (1) detects the CT measured value of fan outlet and the CT measured value of substation low-voltage side in the inner every bar serial type structure of wind energy turbine set, determines whether syndrome serial according to measured value;
In step (2) detection failure string, the measured value of every Fans exit CT, obtains the magnitude relationship between the CT measured value of wind turbine exit;
The magnitude relationship of step (3) according to wind turbine outlet CT measured value and the distribution situation of the cable distance apart from electrical network, to the localization of fault of cable;
Localization of fault described in step (3) is:
According to the size of the measured value of fan outlet CT and the range distribution of wind turbine distance electrical network, in syndrome serial, away from grid side blower fan from trouble spot more away from electric current less, near grid side blower fan from trouble spot more away from electric current less, according to the monotone decreasing relation of electric current, can judge trouble spot is between which two Fans.
2. the method for claim 1, is characterized in that: determine whether that the method for syndrome serial is as follows described in step (1):
(1) if meet formula: it is then syndrome serial;
(2) if meet formula: it is then non-faulting string;
Wherein: m is total number of units of wind energy turbine set inner blower; B is the number of units of wind energy turbine set internal fault string blower fan; for the current value that wind turbine exit CT in wind energy turbine set measures; for substation low-voltage side is often being got lines crossed the measured value of road CT; for the short-circuit current of fault point.
3. the method for claim 1, is characterized in that: the magnitude relationship in the syndrome serial described in step (2) between the CT measured value of wind turbine exit is:
Cable resistance between wind power generating set impedance >> system side impedance > blower fan;
in syndrome serial away from the blower fan of grid side from trouble spot more away from electric current less;
in syndrome serial near the blower fan of grid side from trouble spot more away from electric current less;
Wherein: system refers to the network system that wind-powered electricity generation place is accessed; One of bifurcated a Fans is not had, wherein: 1≤a≤b in syndrome serial; Trouble spot is positioned near f, f+1 blower fan; I 1~ I afor the current value of the not wind turbine exit CT measurement of bifurcated in syndrome serial; Z wTfor the impedance of wind power generating set.
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CN104198895A (en) * 2014-09-16 2014-12-10 湖南华大紫光科技股份有限公司 Wind farm cable fault locating method

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