CN107064727A - A kind of distribution network fault line selection method based on transient state energy difference - Google Patents

A kind of distribution network fault line selection method based on transient state energy difference Download PDF

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CN107064727A
CN107064727A CN201610828508.XA CN201610828508A CN107064727A CN 107064727 A CN107064727 A CN 107064727A CN 201610828508 A CN201610828508 A CN 201610828508A CN 107064727 A CN107064727 A CN 107064727A
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circuit
transient state
state energy
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CN107064727B (en
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束洪春
王书领
曹璞璘
沐润志
陈诺
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Kunming University of Science and Technology
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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 relates to a kind of distribution network fault line selection method based on transient state energy difference, belong to electric power system fault route selection technical field.The present invention builds distribution network simulation model according to the actual motion of power distribution network, and sets different circuits and separate earth fault in simulation model, obtains each circuit of power distribution network and corresponding transient zero-sequence current and bus residual voltage signal are produced under earth fault.Choose each bar feeder line zero-sequence current and residual voltage in 5ms after failure, ask for the transient state energy and circuit transient state energy average in the 5ms after a failure of each circuit, utilize transient state energy and transient state energy average construction route selection function, when the route selection functional value of certain circuit is more than transient state energy average, the circuit is non-fault line;When the route selection functional value of certain circuit is equal to transient state energy average, the circuit is faulty line.

Description

A kind of distribution network fault line selection method based on transient state energy difference
Technical field
The present invention relates to a kind of distribution network fault line selection method based on transient state energy difference, belong to electric power system fault route selection Technical field.
Background technology
The quantity and scale of the circuit of power distribution network are all increasing, and this adds very big work to power distribution network operation maintenance Measure.And earth fault is often to send out in power distribution network fault type intractable, when the distribution of neutral by arc extinction coil grounding When singlephase earth fault occurs for net, symmetry is remained between the three-phase line voltage of power network, because the compensation of arc suppression coil is made With the fault current of generation is smaller, and according to Operation of Electric Systems code, system can continue to run with 1- with tape jam in this case 2h, it is not necessary to trip at once, keeps the power supply continuity to load.A large amount of use of the cable run in power distribution network causes at this stage Power distribution network is when occurring singlephase earth fault, and the zero sequence capacitance current of generation is larger, it is to avoid power network operates with failure in long-time Make failure propagation into or multipoint earthing short circuit at 2 points, damage equipment, endanger the safe and stable operation of system, promptly and accurately determine Earth fault line, carries out troubleshooting and is particularly important.
The content of the invention
The technical problem to be solved in the present invention is to propose a kind of distribution network fault line selection method based on transient state energy difference, mesh Be be directed to power distribution network in circuit occur single-line ground failure when can rapidly carry out select-line analysis;Reduce live operation maintenance Personnel carry out the workload of accident analysis, and quick lock in fault coverage, route selection accuracy rate is higher, disclosure satisfy that power distribution network is steady safely The need for fixed operation.
The technical scheme is that:A kind of distribution network fault line selection method based on transient state energy difference, according to power distribution network Actual motion build distribution network simulation model, and different circuits and separate earth fault are set in simulation model, obtained Each circuit of power distribution network produces corresponding transient zero-sequence current and bus residual voltage signal under earth fault.Choose after failure Each bar feeder line zero-sequence current and residual voltage in 5ms, the transient state energy and circuit asked in the 5ms after a failure of each circuit are temporary State average energy value, constructs route selection function, when the route selection functional value of certain circuit is more than using transient state energy and transient state energy average During transient state energy average, the circuit is non-fault line;, should when the route selection functional value of certain circuit is equal to transient state energy average Circuit is faulty line.
Concretely comprise the following steps:
(1) each circuit transient zero sequence current signal i is extracted0i(t) with bus residual voltage signal u0(t):
1. distribution network electromagnetic transient simulation model is built according to the actual motion of transformer station in power distribution network;
2. different circuits and separate earth fault are set in electromagnetic transient simulation model, obtain each circuit of power distribution network in ground connection Corresponding transient zero sequence current signal i is produced under failure0i(t) with bus residual voltage signal u0(t);
(2) i is utilized0iAnd u (t)0(t) the zero-sequence energy function W of circuit is definedi(t) and try to achieve each circuit failure occur Respective value in 5ms afterwards:
1. the zero-sequence energy function W of circuit is definedi(t):
Wherein, Wi(t) it is the zero-sequence energy function on i-th line road after failure;u0(t) it is bus residual voltage;i0i(t) it is The zero-sequence current on i-th line road;N is feedback number of lines;
2. the transient state energy W in 5ms after each feeder fault is asked foriFor:
3. the transient state energy average of each N bars circuit is asked for
(3) transient state energy W is utilizediWith transient state energy averageConstruct route selection function Eifault
1. route selection function Ei is definedfault
2. route selection function EifaultFault distinguishing:
WhenCircuit i is faulty line;
WhenCircuit i is non-fault line.
The beneficial effects of the invention are as follows:The purpose of the present invention is to realize the failure line selection of power distribution network, using in fault-signal Transient state component realize route selection, do not influenceed by fault close angle, and can improve fault line detection nargin, while location design is simple, The degree of accuracy is higher, and line selection algorithm is easily achieved.
Brief description of the drawings
Fig. 1 is present invention emulation distribution net work structure figure;
Embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1:A kind of distribution network fault line selection method based on transient state energy difference, takes according to the actual motion of power distribution network Distribution network simulation model is built, and different circuits and separate earth fault are set in simulation model, each circuit of power distribution network is obtained Corresponding transient zero sequence current signal i is produced under earth fault0i(t) with bus residual voltage signal u0(t);Choose failure Zero-sequence current i in 5ms afterwards0i(t) with residual voltage u0(t), then according to zero-sequence energy function Wi(t) each circuit, is asked for Transient state energy W in 5ms after a failurei, then try to achieve circuit transient state energy averageUtilize transient state energy WiIt is equal with transient state energy ValueConstruct route selection function Eifault, whenWhen, circuit i is non-fault line;WhenCircuit i is fault wire Road.
Concretely comprise the following steps:
(1) each circuit transient zero sequence current signal i is extracted0i(t) with bus residual voltage signal u0(t):
1. distribution network electromagnetic transient simulation model is built according to the actual motion of transformer station in power distribution network;
2. different circuits and separate earth fault are set in electromagnetic transient simulation model, obtain each circuit of power distribution network in ground connection Corresponding transient zero sequence current signal i is produced under failure0i(t) with bus residual voltage signal u0(t);
(2) i is utilized0iAnd u (t)0(t) the zero-sequence energy function W of circuit is definedi(t) and try to achieve each circuit failure occur Respective value in 5ms afterwards:
1. the zero-sequence energy function W of circuit is definedi(t):
Wherein, Wi(t) it is the zero-sequence energy function on i-th line road after failure;u0(t) it is bus residual voltage;i0i(t) it is The zero-sequence current on i-th line road;N is feedback number of lines;
2. the transient state energy W in 5ms after each feeder fault is asked foriFor:
3. the transient state energy average of each N bars circuit is asked for
(3) transient state energy W is utilizediWith transient state energy averageConstruct route selection function Eifault
1. route selection function Ei is definedfault
2. route selection function EifaultFault distinguishing:
WhenCircuit i is faulty line;
WhenCircuit i is non-fault line.
Embodiment 2:The present embodiment other parts are same as Example 1, as shown in figure 1,110kV/35kV distribution network simulations Model is as shown in figure 1, it has 6 feeder lines, and Z-shaped transformer neutral point is grounded by arc suppression coil series resistance.Overhead feeder L1=18km, L3=30km, L5=15km, line-cable mixing feeder line L4=14km, its overhead feeder 12km, cable 2km, cable feedback Line L2=7km, L6=9km.G in the power network is infinitely great power supply;T is main transformer, and no-load voltage ratio is 110kV/35kV, joint group Wei not YN/d11;TZIt is zigzag transformer;L is arc suppression coil;R is the damping resistance of arc suppression coil.Feeder line using overhead transmission line, Three kinds of circuits of overhead line-cable hybrid line and cable run.Load selects firm power load model.Feeder line L1Distance begins 5 km A phases are held to occur singlephase earth fault, the Ω of grounding resistance 10, fault angle is 30 °, and sample frequency is 10kHz.Power distribution network After breaking down, zero-sequence current data and residual voltage data are calculated in window when extracting each circuit 5ms after failure transient state energy, Transient state energy average and route selection function Efault(i)Value.Feeder line L1'sThat is feeder line L1 is faulty line, then route selection As a result it is correct.
Above in association with accompanying drawing to the present invention embodiment be explained in detail, but the present invention be not limited to it is above-mentioned Embodiment, can also be before present inventive concept not be departed from the knowledge that those of ordinary skill in the art possess Put that various changes can be made.

Claims (2)

1. a kind of distribution network fault line selection method based on transient state energy difference, it is characterised in that:According to the actual motion of power distribution network Distribution network simulation model is built, and different circuits and separate earth fault are set in simulation model, each line of power distribution network is obtained Road produces corresponding transient zero-sequence current and bus residual voltage signal under earth fault.Choose each in 5ms after failure Bar feeder line zero-sequence current and residual voltage, the transient state energy and circuit transient state energy asked in the 5ms after a failure of each circuit are equal Value, route selection function is constructed using transient state energy and transient state energy average, when the route selection functional value of certain circuit is more than transient state energy During average, the circuit is non-fault line;When the route selection functional value of certain circuit is equal to transient state energy average, the circuit is event Hinder circuit.
2. the distribution network fault line selection method according to claim 1 based on transient state energy difference, it is characterised in that specific step Suddenly it is:
(1) each circuit transient zero sequence current signal i is extracted0i(t) with bus residual voltage signal u0(t):
1. distribution network electromagnetic transient simulation model is built according to the actual motion of transformer station in power distribution network;
2. different circuits and separate earth fault are set in electromagnetic transient simulation model, obtain each circuit of power distribution network in earth fault It is lower to produce corresponding transient zero sequence current signal i0i(t) with bus residual voltage signal u0(t);
(2) i is utilized0iAnd u (t)0(t) the zero-sequence energy function W of circuit is definedi(t) and try to achieve each circuit failure generation after 5ms Interior respective value:
1. the zero-sequence energy function W of circuit is definedi(t):
<mrow> <msub> <mi>W</mi> <mi>i</mi> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mi>t</mi> </msubsup> <msub> <mi>u</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> <msub> <mi>i</mi> <mrow> <mn>0</mn> <mi>i</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&amp;tau;</mi> <mo>)</mo> </mrow> <mi>d</mi> <mi>&amp;tau;</mi> <mo>,</mo> <mi>i</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mi>N</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
Wherein, Wi(t) it is the zero-sequence energy function on i-th line road after failure;u0(t) it is bus residual voltage;i0i(t) it is i-th The zero-sequence current of circuit;N is feedback number of lines;
2. the transient state energy W in 5ms after each feeder fault is asked foriFor:
<mrow> <msub> <mi>W</mi> <mi>i</mi> </msub> <mo>=</mo> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mfrac> <mi>T</mi> <mn>4</mn> </mfrac> </msubsup> <msub> <mi>u</mi> <mn>0</mn> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <msub> <mi>i</mi> <mrow> <mn>0</mn> <mi>i</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>t</mi> <mo>)</mo> </mrow> <mi>d</mi> <mi>t</mi> <mo>,</mo> <mi>i</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mi>N</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
3. the transient state energy average of each N bars circuit is asked for
<mrow> <mover> <mi>W</mi> <mo>&amp;OverBar;</mo> </mover> <mo>=</mo> <mroot> <mrow> <munderover> <mo>&amp;Sigma;</mo> <mrow> <mi>i</mi> <mo>=</mo> <mn>1</mn> </mrow> <mi>N</mi> </munderover> <msub> <msup> <mi>W</mi> <mn>2</mn> </msup> <mi>i</mi> </msub> </mrow> <mn>2</mn> </mroot> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>3</mn> <mo>)</mo> </mrow> </mrow>
(3) transient state energy W is utilizediWith transient state energy averageConstruct route selection function Eifault
1. route selection function Ei is definedfault
<mrow> <msub> <mi>Ei</mi> <mrow> <mi>f</mi> <mi>a</mi> <mi>u</mi> <mi>l</mi> <mi>t</mi> </mrow> </msub> <mo>=</mo> <msub> <mi>W</mi> <mi>j</mi> </msub> <mo>-</mo> <mi>m</mi> <mi>a</mi> <mi>x</mi> <mo>{</mo> <mi>W</mi> <mi>i</mi> <mo>-</mo> <mover> <mi>W</mi> <mo>&amp;OverBar;</mo> </mover> <mo>}</mo> <mo>,</mo> <mi>i</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mi>N</mi> <mo>;</mo> <mi>j</mi> <mo>=</mo> <mn>1</mn> <mo>,</mo> <mn>2</mn> <mo>,</mo> <mo>...</mo> <mo>,</mo> <mi>N</mi> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>4</mn> <mo>)</mo> </mrow> </mrow>
2. route selection function EifaultFault distinguishing:
WhenCircuit i is faulty line;
WhenCircuit i is non-fault line.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254657A (en) * 2018-03-28 2018-07-06 山东大学 Power distribution network section with low-current ground faults localization method based on Study of Transient Energy

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Publication number Priority date Publication date Assignee Title
RU2006112901A (en) * 2003-10-22 2007-11-27 Абб Оу (Fi) METHOD AND DEVICE FOR DETERMINING AN UNEXPECTED EARTHING VIOLATION
CN101188354A (en) * 2007-11-30 2008-05-28 昆明理工大学 Test simulation method for failure line selection of small current ground system
CN101546906A (en) * 2009-05-05 2009-09-30 昆明理工大学 Method for fault line selection of electric distribution network by using S transformation energy relative entropy
CN103941163A (en) * 2014-05-12 2014-07-23 福州大学 Resonant earthed system fault line selection method utilizing fuzzy K-means clustering

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2006112901A (en) * 2003-10-22 2007-11-27 Абб Оу (Fi) METHOD AND DEVICE FOR DETERMINING AN UNEXPECTED EARTHING VIOLATION
CN101188354A (en) * 2007-11-30 2008-05-28 昆明理工大学 Test simulation method for failure line selection of small current ground system
CN101546906A (en) * 2009-05-05 2009-09-30 昆明理工大学 Method for fault line selection of electric distribution network by using S transformation energy relative entropy
CN103941163A (en) * 2014-05-12 2014-07-23 福州大学 Resonant earthed system fault line selection method utilizing fuzzy K-means clustering

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108254657A (en) * 2018-03-28 2018-07-06 山东大学 Power distribution network section with low-current ground faults localization method based on Study of Transient Energy
CN108254657B (en) * 2018-03-28 2019-11-26 山东大学 Power distribution network section with low-current ground faults localization method based on Study of Transient Energy

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