CN107153149B  Power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic  Google Patents
Power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic Download PDFInfo
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 CN107153149B CN107153149B CN201710331464.4A CN201710331464A CN107153149B CN 107153149 B CN107153149 B CN 107153149B CN 201710331464 A CN201710331464 A CN 201710331464A CN 107153149 B CN107153149 B CN 107153149B
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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

 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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 Testing Of ShortCircuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
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Abstract
The present invention discloses a kind of power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic, comprising: step 1: in the threephase voltage of substation's acquisition bus and the threephase current of each route；Step 2: extracting bus negative sequence voltage and each route negativesequence current；Step 3: seeking the derivative of each outlet negativesequence current；Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negativesequence current；Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related coefficient is less than 0, for faulty line.The present invention is based on the power distribution network singlephase disconnection recognition methods of negative sequence voltage and negativesequence current derivative correlation method to have bootstrapping property, is not influenced by neutral grounding in distribution power network, can be with all kinds of disconnection faults of reliable recognition.
Description
Technical field
The present invention relates to power distribution network relay protection field, in particular to a kind of identification side of power distribution network singlephase disconnection failure
Method.
Background technique
With the propulsion of distribution network construction, insulating frame ceases to be busy is using increasing.With the raising of line insulation rate, thunder
There are also the other reasons such as construction for the reason of it is more and more to hit disconnection fault, while causing disconnection fault.Power distribution network occurs singlephase disconnected
The normal operation of power distribution network is not influenced after line, so being often difficult to find this kind of failure.But if disconnection fault cannot be timely
Processed, it will cause the accidents such as the electric shock of people and animals around, and it is therefore necessary to study power distribution network broken string identification technology.
Summary of the invention
The purpose of the present invention is to provide a kind of power distribution network singlephase disconnection fault identifications based on negative sequence voltage current characteristic
Method, to solve the above technical problems.
To achieve the goals above, the present invention adopts the following technical scheme:
Power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic, comprising the following steps:
Step 1: in the threephase voltage of substation's acquisition bus and the threephase current of each route；
Step 2: extracting bus negative sequence voltage and each route negativesequence current；
Step 3: seeking the derivative of each outlet negativesequence current；
Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negativesequence current；
Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related
Coefficient is then faulty line less than 0.
Further, bus negative sequence voltage and each route negativesequence current are extracted by formula (3) in step 2:
Wherein u_{0}(k)、i_{0}(k) it is the sample amplitude when reproduced and electric current of residual voltage and zerosequence current, passes through threephase voltage and three
Phase current synthesizes to obtain, and N is the sampling number of every frequency cycle.
Further, step 3 seeks the derivative of each outlet negativesequence current by formula (4):
Further, step 4 seeks the related coefficient of bus negative sequence voltage Yu each outlet negativesequence current by formula (5):
Compared with the existing technology, the invention has the following advantages: the present invention initially set up power distribution network occur it is singlephase
Model after disconnection fault, negative sequence voltage and the electric current for being then based on Analysis of Failure Model sound circuit and faulty line are special
Sign, and propose the recognition methods of faulty line.The present invention is based on the power distribution networks of negative sequence voltage and negativesequence current derivative correlation method
Singlephase wire break recognition methods has bootstrapping property, is not influenced by neutral grounding in distribution power network, can be with all kinds of broken strings of reliable recognition
Failure.
Detailed description of the invention
Fig. 1 is that the negative phasesequence equivalent network schematic diagram after singlephase wire break occurs for power distribution network；
Fig. 2 is 10kV power distribution network simulation model schematic diagram；
Fig. 3 is that negative sequence voltage and negativesequence current derivative related coefficient after singlephase wire break failure occur for isolated neutral system；
Fig. 4 be arc suppression coil earthing system occur singlephase wire break failure after negative sequence voltage and negativesequence current derivative phase relation
Number.
Specific embodiment
Present invention seek to address that singlephase wire break fault identification problem occurs for power distribution network.After pointing out that singlephase wire break occurs for power distribution network
Negative phasesequence equivalent network as shown in Figure 1, wherein Z_{in}Indicate the equivalent negative phasesequence of ith outlet route, load transformer and load
Reactance, i_{in}Indicate the negativesequence current of ith outlet, Z_{mdn}、i_{mdn}Indicate the equivalent negative sequence neactance and negative phasesequence electricity in faulty line downstream
Stream, Z_{mun}、i_{mun}Indicate the equivalent negative sequence neactance and negativesequence current of faulty line upstream, Z_{Gn}、i_{Gn}Indicate the equivalent negative of system power supply
Sequence reactance and negativesequence current, Z_{Ln}、i_{Ln}Indicate the equivalent negative sequence neactance and negativesequence current of arc suppression coil, i_{n}Indicate that incision position injects net
The equivalent negative phasesequence current source of network.
As can be seen from Figure 1 bus is flowed to by route for faulty line negativesequence current, for sound circuit be by
Bus flows to route because by route, load transformer and load it is equivalent at a negative sequence neactance, for perfecting line
Road meets:
Faulty line is met:
It is positively correlated from formula (1), (2) it can be seen that meeting for the derivative of sound circuit negative sequence voltage and negativesequence current, therefore
The derivative of the negative sequence voltage and negativesequence current that hinder route meets negatively correlated.The differentiation of faulty line can be realized accordingly, specifically
Step are as follows:
Step 1: in the threephase voltage (u of substation's acquisition bus_{a}(k), u_{b}(k), u_{c}And the threephase current of each route (k))
(i_{a}(k), i_{b}(k), i_{c}(k))；
Step 2: by formula (3), extracting bus negative sequence voltage u_{n}(k) and each route negativesequence current i_{n}(k)；
Wherein u_{0}(k)、i_{0}(k) it is the sample amplitude when reproduced and electric current of residual voltage and zerosequence current, passes through threephase voltage (u_{a}
(k), u_{b}(k), u_{c}And threephase current (i (k))_{a}(k), i_{b}(k), i_{c}(k)) synthesis obtains, and N is the sampling number of every frequency cycle.
Step 3: the derivative of each outlet negativesequence current is sought by formula (4)；
Wherein, Δ T is sampling step length；
Step 4: the related coefficient of bus negative sequence voltage Yu each outlet negativesequence current is sought by formula (5)；
Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related
Coefficient is then faulty line less than 0.
Simulating, verifying:
Fig. 2 is the 10kV power distribution network simulation model schematic diagram established based on PSCAD；In the model, 35kV substation has two
It is single busbar form by the 10kV system that two main transformers are allotted back into line；Bus has 4 main feeders, each in outlet
The number of section is as shown in the figure.Wherein, section 1,3,5,10 is cable, and section 2,9,11,12,13 is aerial insulated wire, area
Section 4,6,7,8,14 is overhead bare conductor.Arc suppression coil is on change neutral point used.When switch K is opened, system is neutral point
Isolated neutral system；Switch K closure is then arc suppression coil earthing system, and overcompensation degree is taken as 10%.
Each section length is respectively as follows: L_{1}=5.1km, L_{2}=4km, L_{3}=3.8km, L_{4}=7.5km, L_{5}=4km, L_{6}=
10km, L_{7}=0.1km, L_{8}=3km, L_{9}=4km, L_{10}=3.2km, L_{11}=10km, L_{12}=5km, L_{13}=3km, L_{14}=7.5km.
Cable data are as follows: positive sequence resistance r_{1}=0.157 Ω/km, positive sequence induction reactance x_{1}=0.076 Ω/km, positive sequence accommodate b_{1}=
132×10^{6}S/km；Zero sequence resistance r_{0}=0.307 Ω/km, zero sequence induction reactance x_{0}=0.304 Ω/km, zero sequence accommodate b_{0}=110 ×
10^{6}S/km。
Aerial insulated wire parameter are as follows: r_{1}=0.27 Ω/km, positive sequence induction reactance x_{1}=0.352 Ω/km, positive sequence accommodate b_{1}=
3.178×10^{6}S/km；Zero sequence resistance r_{0}=0.42 Ω/km, zero sequence induction reactance x_{0}=3.618 Ω/km, zero sequence accommodate b_{0}=0.676
×10^{6}S/km。
Bare conductor parameter in section 7,8 are as follows: positive sequence resistance r_{1}=0.91 Ω/km, positive sequence induction reactance x_{1}=0.403 Ω/km, just
Sequence accommodates b_{1}=2.729 × 10^{6}S/km；Zero sequence resistance r_{0}=1.06 Ω/km, zero sequence induction reactance x_{0}=3.618 Ω/km, zero sequence accommodate
b_{0}=0.672 × 10^{6}S/km。
Other section bare conductor parameters are as follows: positive sequence resistance r_{1}=0.63 Ω/km, positive sequence induction reactance x_{1}=0.392 Ω/km, positive sequence
Accommodate b_{1}=2.807 × 10^{6}S/km；Zero sequence resistance r_{0}=0.78 Ω/km, zero sequence induction reactance x_{0}=3.593 Ω/km, zero sequence accommodate b_{0}
=0.683 × 10^{6}S/km。
Two main transformer parameters are respectively as follows: capacity S_{N}=2MVA, short circuit loss P_{k}=20.586kW, shortcircuit voltage percentage
U_{k}%=6.37%, noload loss P_{0}=2.88kW, noload current percentage I_{0}%=0.61%；Capacity S_{N}=2MVA, short circuit damage
Consume P_{k}=20.591kW, shortcircuit voltage percentage U_{k}%=6.35%, noload loss P_{0}=2.83kW, noload current percentage
I_{0}%=0.62%.
Each distribution transformer and institute's jointing is enabled to number consistent, then their capacity is respectively as follows: S_{5N}=50kVA, S_{7N}=
500kVA, S_{8N}=200kVA, S_{9N}=1MVA, S_{10N}=100kVA, S_{12N}=1MVA, S_{13N}=400kVA, S_{14N}=630kVA.For
For the sake of simplicity, each distribution transformer institute onload is unified for the 80% of transformer capacity, power factor 0.85.
Fig. 3 is that the waveform that singlephase wire break phase to phase fault emulates is arranged in the end of isolated neutral system section 1.It can be with
Find out, the related coefficient of route 1 is negative value, other routes are positive, it is possible to which determination is that disconnection fault has occurred in route 1.
Fig. 4 flanks earth fault in the head end setting singlephase wire break application of load of section 4 for arc suppression coil earthing system and emulates
The waveform arrived.As can be seen that the related coefficient of route 4 is negative value, other routes are positive, it is possible to which true timing circuit 4 occurs
Disconnection fault.
To sum up analysis based on the power distribution network singlephase disconnection of negative sequence voltage and negativesequence current derivative correlation method it can be seen that identified
Method has bootstrapping property, is not influenced by neutral grounding in distribution power network, can be with all kinds of disconnection faults of reliable recognition.
Claims (2)
1. the power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic, which is characterized in that including following step
It is rapid:
Step 1: in the threephase voltage of substation's acquisition bus and the threephase current of each route；
Step 2: extracting bus negative sequence voltage and each route negativesequence current；
Step 3: seeking the derivative of each outlet negativesequence current；
Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negativesequence current；
Step 5: the related coefficient of more each route, if related coefficient is greater than 0, for sound circuit；If related coefficient
It is then faulty line less than 0；
Bus negative sequence voltage and each route negativesequence current are extracted by formula (3) in step 2:
Wherein u_{0}(k)、i_{0}(k) it is the sample amplitude when reproduced and electric current of residual voltage and zerosequence current, passes through threephase voltage and threephase electricity
Stream synthesis obtains, and N is the sampling number of every frequency cycle；
Step 4 seeks the related coefficient of bus negative sequence voltage Yu each outlet negativesequence current by formula (5):
2. the power distribution network singlephase disconnection fault recognition method according to claim 1 based on negative sequence voltage current characteristic,
It is characterized in that, step 3 seeks the derivative of each outlet negativesequence current by formula (4):
Δ T is sampling step length.
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Effective date of registration: 20201231 Address after: Room D301, gazelle Valley, No.1, Zone C, venture R & D Park, 69 Jinye Road, high tech Zone, Xi'an City, Shaanxi Province, 710077 Patentee after: XI'AN XIRUI CONTROL TECHNOLOGY Co.,Ltd. Address before: Beilin District Xianning West Road 710049, Shaanxi city of Xi'an province No. 28 Patentee before: XI'AN JIAOTONG University 