CN107153149B - Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic - Google Patents

Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic Download PDF

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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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negative
sequence
current
phase
voltage
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CN107153149A (en
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宋国兵
常仲学
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XI'AN XIRUI CONTROL TECHNOLOGY Co.,Ltd.
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Xi an Jiaotong University
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing

Abstract

The present invention discloses a kind of power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic, comprising: step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of each route;Step 2: extracting bus negative sequence voltage and each route negative-sequence current;Step 3: seeking the derivative of each outlet negative-sequence current;Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence 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 single-phase disconnection recognition methods of negative sequence voltage and negative-sequence 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

Power distribution network single-phase disconnection fault recognition method based on negative sequence voltage current characteristic
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 single-phase 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 single-phase 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 single-phase 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 single-phase disconnection fault recognition method based on negative sequence voltage current characteristic, comprising the following steps:
Step 1: in the three-phase voltage of substation's acquisition bus and the three-phase current of each route;
Step 2: extracting bus negative sequence voltage and each route negative-sequence current;
Step 3: seeking the derivative of each outlet negative-sequence current;
Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence 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 negative-sequence current are extracted by formula (3) in step 2:
Wherein u0(k)、i0(k) it is the sample amplitude when reproduced and electric current of residual voltage and zero-sequence current, passes through three-phase 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 negative-sequence current by formula (4):
Further, step 4 seeks the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence 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 single-phase 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 negative-sequence current derivative correlation method Single-phase 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 phase-sequence equivalent network schematic diagram after single-phase 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 negative-sequence current derivative related coefficient after single-phase wire break failure occur for isolated neutral system;
Fig. 4 be arc suppression coil earthing system occur single-phase wire break failure after negative sequence voltage and negative-sequence current derivative phase relation Number.
Specific embodiment
Present invention seek to address that single-phase wire break fault identification problem occurs for power distribution network.After pointing out that single-phase wire break occurs for power distribution network Negative phase-sequence equivalent network as shown in Figure 1, wherein ZinIndicate the equivalent negative phase-sequence of i-th outlet route, load transformer and load Reactance, iinIndicate the negative-sequence current of i-th outlet, Zmdn、imdnIndicate the equivalent negative sequence neactance and negative phase-sequence electricity in faulty line downstream Stream, Zmun、imunIndicate the equivalent negative sequence neactance and negative-sequence current of faulty line upstream, ZGn、iGnIndicate the equivalent negative of system power supply Sequence reactance and negative-sequence current, ZLn、iLnIndicate the equivalent negative sequence neactance and negative-sequence current of arc suppression coil, inIndicate that incision position injects net The equivalent negative phase-sequence current source of network.
As can be seen from Figure 1 bus is flowed to by route for faulty line negative-sequence 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 negative-sequence current, therefore The derivative of the negative sequence voltage and negative-sequence 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 three-phase voltage (u of substation's acquisition busa(k), ub(k), ucAnd the three-phase current of each route (k)) (ia(k), ib(k), ic(k));
Step 2: by formula (3), extracting bus negative sequence voltage un(k) and each route negative-sequence current in(k);
Wherein u0(k)、i0(k) it is the sample amplitude when reproduced and electric current of residual voltage and zero-sequence current, passes through three-phase voltage (ua (k), ub(k), ucAnd three-phase current (i (k))a(k), ib(k), ic(k)) synthesis obtains, and N is the sampling number of every frequency cycle.
Step 3: the derivative of each outlet negative-sequence 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 negative-sequence 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: L1=5.1km, L2=4km, L3=3.8km, L4=7.5km, L5=4km, L6= 10km, L7=0.1km, L8=3km, L9=4km, L10=3.2km, L11=10km, L12=5km, L13=3km, L14=7.5km.
Cable data are as follows: positive sequence resistance r1=0.157 Ω/km, positive sequence induction reactance x1=0.076 Ω/km, positive sequence accommodate b1= 132×10-6S/km;Zero sequence resistance r0=0.307 Ω/km, zero sequence induction reactance x0=0.304 Ω/km, zero sequence accommodate b0=110 × 10-6S/km。
Aerial insulated wire parameter are as follows: r1=0.27 Ω/km, positive sequence induction reactance x1=0.352 Ω/km, positive sequence accommodate b1= 3.178×10-6S/km;Zero sequence resistance r0=0.42 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence accommodate b0=0.676 ×10-6S/km。
Bare conductor parameter in section 7,8 are as follows: positive sequence resistance r1=0.91 Ω/km, positive sequence induction reactance x1=0.403 Ω/km, just Sequence accommodates b1=2.729 × 10-6S/km;Zero sequence resistance r0=1.06 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence accommodate b0=0.672 × 10-6S/km。
Other section bare conductor parameters are as follows: positive sequence resistance r1=0.63 Ω/km, positive sequence induction reactance x1=0.392 Ω/km, positive sequence Accommodate b1=2.807 × 10-6S/km;Zero sequence resistance r0=0.78 Ω/km, zero sequence induction reactance x0=3.593 Ω/km, zero sequence accommodate b0 =0.683 × 10-6S/km。
Two main transformer parameters are respectively as follows: capacity SN=2MVA, short circuit loss Pk=20.586kW, short-circuit voltage percentage Uk%=6.37%, no-load loss P0=2.88kW, no-load current percentage I0%=0.61%;Capacity SN=2MVA, short circuit damage Consume Pk=20.591kW, short-circuit voltage percentage Uk%=6.35%, no-load loss P0=2.83kW, no-load current percentage I0%=0.62%.
Each distribution transformer and institute's jointing is enabled to number consistent, then their capacity is respectively as follows: S5N=50kVA, S7N= 500kVA, S8N=200kVA, S9N=1MVA, S10N=100kVA, S12N=1MVA, S13N=400kVA, S14N=630kVA.For For the sake of simplicity, each distribution transformer institute on-load is unified for the 80% of transformer capacity, power factor 0.85.
Fig. 3 is that the waveform that single-phase 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 single-phase 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 single-phase disconnection of negative sequence voltage and negative-sequence 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 single-phase 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 three-phase voltage of substation's acquisition bus and the three-phase current of each route;
Step 2: extracting bus negative sequence voltage and each route negative-sequence current;
Step 3: seeking the derivative of each outlet negative-sequence current;
Step 4: seeking the related coefficient of bus negative sequence voltage Yu each outlet negative-sequence 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 negative-sequence current are extracted by formula (3) in step 2:
Wherein u0(k)、i0(k) it is the sample amplitude when reproduced and electric current of residual voltage and zero-sequence current, passes through three-phase voltage and three-phase 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 negative-sequence current by formula (5):
2. the power distribution network single-phase 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 negative-sequence current by formula (4):
Δ T is sampling step length.
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CN108054739B (en) * 2017-12-18 2019-05-28 广东电网有限责任公司珠海供电局 A kind of overhead transmission line feeder automation method and system based on negative-sequence current
CN109375030A (en) * 2018-09-06 2019-02-22 深圳供电局有限公司 The recognition methods of high voltage overhead lines disconnection fault and device
CN109596945B (en) * 2019-01-18 2020-09-25 广东电网有限责任公司 Novel power distribution network fault line selection method based on correlation coefficient vector similarity degree
CN111323733A (en) * 2020-03-23 2020-06-23 贵州电网有限责任公司 Single-phase disconnection monitoring method based on negative sequence voltage at distributed power supply terminal

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