CN107086549A - The segment protection method of distance I of UPFC line attachment single-phase grounding faults - Google Patents
The segment protection method of distance I of UPFC line attachment single-phase grounding faults Download PDFInfo
- Publication number
- CN107086549A CN107086549A CN201710362529.1A CN201710362529A CN107086549A CN 107086549 A CN107086549 A CN 107086549A CN 201710362529 A CN201710362529 A CN 201710362529A CN 107086549 A CN107086549 A CN 107086549A
- Authority
- CN
- China
- Prior art keywords
- mrow
- msub
- distance
- fault
- msup
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention belongs to the segment protection method of distance I of circuit on power system relay protection field, more particularly to a kind of UPFC line attachments single-phase grounding fault.The present invention will not be produced using UPFC accesses on system zero-sequence network influences this feature, residual voltage electric current geometrical property builds similar triangles after combination failure, propose a kind of fault distance computational methods available for UPFC line attachment single-phase grounding faults, this method is analyzed based on post-fault system residual voltage electric current phasor, boost line construction similar triangles are added in system residual voltage electric current phasor figure after a failure, fault distance equation is constructed using the geometrical property of similar triangles, and abbreviation is carried out to it, solve fault distance.This method can overcome transition resistance and UPFC to adjust the distance I section of influence protected simultaneously, and with good universality, algorithm is simple and reliable, it is not necessary to handled at strict pair, be easy to microcomputer protective relay to realize, with very high practical value.
Description
Technical field
The invention belongs to circuit on power system relay protection field, more particularly to a kind of UPFC line attachments single-phase earthing are short
The segment protection method of distance I of road failure.
Background technology
With developing rapidly for China's economy, electric energy has obtained more and more extensive as a kind of secondary energy sources of clean and effective
Application.Big system, super-pressure long distance power transmission, transregional networking emerge in an endless stream.At the same time, the development of power industry is also positive
Face electric power infrastructure investment big, land acquisition is difficult, the problems such as shortage of electric power.Therefore existing transmission line of electricity is given full play to
Potentiality, improve the transmission capacity of bulk power grid and the reliability of system turns into power system urgent problem to be solved.For solution
Certainly these problems, FACTS (FACTS) arises at the historic moment, and it combines modern power electronics technology, automatically controlled
Technology and computer technology, can be achieved control safer to power system, more stable, more efficient, more flexible.And UPFC (systems
One flow controller) as a kind of connection in series-parallel mixed type FACTS devices, two kinds of compensation ways of connection in series-parallel can be realized simultaneously, therefore
It is widely used in power system, is described as most promising FACTS technologies.UPFC can to system voltage,
Line impedance, power flow etc. realize continuous quick frequently regulation control, improve conveying capacity and system maintenance level.But by
The parameters such as system voltage, electric current, impedance are changed in UPFC access, therefore will certainly be to the correct of system relay protection device
Action produces influence, still the most serious with the influence for protection of adjusting the distance.In addition, the failure of circuit more than 90% is single-phase earthing
Short trouble, therefore, need badly seek a kind of distance protecting method suitable for UPFC line attachment single-phase grounding faults with
Overcome the shortcomings of traditional distance protection method.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, tradition distance is protected for transition resistance and UPFC accesses
A kind of influence of shield, it is proposed that segment protection method of distance I suitable for UPFC line attachment single-phase grounding faults.
The technical method of the present invention is as described below：
A kind of segment protection method of distance I of UPFC line attachments single-phase grounding fault, comprises the following steps：
Step 1：According to simplifying network analysis figure and combining connection in series-parallel converter power transformer winding connection form, drafting contains
The positive sequence network figure of negative zero three of system, is analyzed each sequence network after failure after UPFC circuit single-phase grounding faults, observation
The influence that UPFC accesses are produced to each sequence network of system after line fault；
Step 2：According to analysis result, with fault branch zero-sequence currentProtected to draw circuit head end after failure with reference to phasor
Protect installation place zero sequence measurement electric currentZero sequence measures voltageTrouble point residual voltageFault branch zero-sequence current
Installation place is protected to circuit residual voltage between trouble pointPhasor diagram；
Step 3：Addition boost line builds similar triangles in the phasor diagram that step 2 is drawn, and is asked using geometric knowledge
Solve two each corners of similar triangles；
Step 4：Using the equal general principle construction fault distance Equation f (p) of each corresponding sides ratio in similar triangles,
And utilize protection installation place zero sequence measurement electric current after failureWith fault branch zero-sequence currentFeature to fault distance Equation f
(p) abbreviation is carried out, fault distance percentage p analytical expression is drawn, by protection installation place zero sequence measurement voltageZero sequence
Measure electric currentSampled value bring into analytical expression, solve fault distance percentage p analytic solutions, and solve fault localization
Average pm；
The fault distance Equation f (p) is：
In formula：Circuit head end protection installation place zero sequence measurement voltage, zero sequence measurement electric current respectively after failure；For circuit zero sequence impedance angle, p is fault distance percentage, that is, protects installation place complete to line length between trouble point and circuit
Long ratio；ZL0For the zero sequence impedance of total track length.
Fault distance percentage p analytical expression is：
In formula：
Circuit head end protection installation place zero sequence measurement voltage, zero sequence measurement electric current respectively after failure；ZL0For
The zero sequence impedance of total track length,For circuit zero sequence impedance angle, C,For intermediate variable.
The analytic solutions of the fault distance percentage p are：
P takes the value for wherein meeting constraints 0≤p≤1；
In formula：Circuit head end protection installation place zero sequence measurement voltage, zero sequence measurement electric current respectively after failure；For circuit zero sequence impedance angle, ZL0For the zero sequence impedance of total track length；To protect installation place to trouble point top-stitching after failure
Road residual voltage.
Step 5：By the fault localization average p obtained by step 4mBring distance protection operation equation, I section of protection of judging distance into
Whether act.Determination methods are as described below：
Sample frequency is determined, the fundametal compoment of sampled data in the first cycle after failure, root are asked for full-wave fourier algorithm
The fault distance corresponding to each sampled point is solved according to fault distance percentage p analytical expression, then seeks its average pm, then pmI.e.
For required fault distance percentage, by pmThe foundation whether acted as I section of protection of judging distance, if pmDistance protection is met to move
Make equation, then I section of protection exit action of distance；
The distance protection operation equation is：pm＜ pset；
Wherein, psetFor I section of setting valve of traditional distance protection.
The beneficial effects of the present invention are：
The present invention is analyzed based on post-fault system residual voltage electric current phasor, after a failure system residual voltage electric current phasor
Boost line construction similar triangles are added in figure, fault distance equation is constructed using the geometrical property of similar triangles, and to it
Abbreviation is carried out, fault distance is solved.The present invention only needs single-end electrical quantity information to be accurately positioned abort situation, it is not necessary to opposite end
Abort situation is accurately positioned and distance after the information such as system voltage electric current, the achievable single-phase grounding fault of circuit containing UPFC
The correct operation of protection.In addition, this method is not influenceed by transition resistance and the UPFC methods of operation, with good universality,
Algorithm is simple and reliable, it is not necessary to is handled at strict pair, is easy to microcomputer protective relay to realize, with very high practical value.
Brief description of the drawings
Accompanying drawing 1 is the segment protection method flow chart of distance I that UPFC accesses single-phase grounding fault；
Accompanying drawing 2 is system schematic containing UPFC；
Accompanying drawing 3 is the schematic diagram of line fault containing UPFC；
Positive sequence network figure after the line fault containing UPFC of accompanying drawing 4；
Negative sequence network figure after the line fault containing UPFC of accompanying drawing 5；
Zero-sequence network figure after the line fault containing UPFC of accompanying drawing 6；
Accompanying drawing 7 is system residual voltage electric current phasor figure after line fault；
Fault distance result of calculation figure when accompanying drawing 8 is PF=0.75；
Fault distance result of calculation figure when accompanying drawing 9 is PF=0.80；
Fault distance result of calculation figure when accompanying drawing 10 is PF=0.85；
Embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.Accompanying drawing 1 is that UPFC accesses single-line to ground fault
The segment protection method flow chart of distance I of failure, as shown in figure 1, carrying out accident analysis to the circuit containing UPFC first, draws event
The positive sequence network figure of negative zero three of system after barrier, and each sequence network figure after failure is analyzed；Secondly, according to analysis result, with event
It is to draw circuit head end protection installation place zero sequence measurement electric current after failure with reference to phasor to hinder branch road zero-sequence currentZero sequence is measured
VoltageTrouble point residual voltage(OD), fault branch zero-sequence currentProtect installation place to trouble point top-stitching
Road residual voltagePhasor diagram, in phasor diagram adding boost line builds similar triangles, and utilizes geometric knowledge
Solve two each corners of similar triangles.Again, fault distance equation is constructed using the similar geometrical property of triangle；Utilize event
Electrical quantity feature reduction solves equation after barrier, draws fault distance percentage analytical expression and fault distance percentage is carried out
Solve；Finally bring the fault distance percentage tried to achieve whether into the I section of protection of operation equation judging distance act.
Further, during three sequence network figures are drawn, specific method is as described below：First to the line containing UPFC
Road carries out accident analysis, and system schematic containing UPFC as shown in Figure 2 is simplified, and the model and abort situation after simplifying are such as
Shown in Fig. 3, it is assumed that occur longitudinal short trouble at F1 in figure 3, due to UPFC connection in series-parallel converter power transformers be respectively adopted Y-Y and
The Y- Δ modes of connection, and two kinds of equal net sides of the mode of connection are earth-free, therefore post-fault system zero-sequence current is not passed through UPFC bodies
Device, i.e., will not change the zero-sequence network structure of post-fault system.Accordingly, changed according to simplification network analysis figure and combination connection in series-parallel
Convertor transformer winding connection form, draws containing the positive sequence network figure of negative zero three after the UPFC system failures as Figure 4-Figure 6, pair event
Each sequence network is analyzed after barrier, the influence that observation UPFC accesses are produced to each sequence network of system after line fault；Accompanying drawing 4- is attached
Fig. 6 is respectively system positive sequence network figure, negative sequence network figure and zero-sequence network figure after UPFC line faults, from Fig. 4-Fig. 6,
UPFC access introduces positive sequence potential by series connection converter power transformer respectively in positive and negative sequence networkWith negative phase-sequence potentialChange
Sequence web frame, therefore can cause very big influence to traditional distance protection method；In the effect of UPFC control systems after failure
Under, the zero-sequence component very little of UPFC series branches offset voltage can be approximately 0.Thus, it is believed that after failure in zero-sequence network only
Introduce string and become zero sequence leakage reactance, and without zero-sqeuence potential access, and then maintain network structure constant, a kind of zero sequence distance can be constructed accordingly
Guard method is to overcome transition resistance and UPFC to access the influence to traditional distance protection method.Contain UPFC according to Fig. 3
Line fault schematic diagram carries out accident analysis, show that installation place zero is protected in circuit head end M sides after the position failure as shown in F1 in figure
Sequence measures voltage expression：
In formulaRespectively circuit head end protection installation place zero sequence measurement voltage, zero sequence measure electric current,For event
Barrier point residual voltage, Z0For protection installation place to circuit zero sequence impedance between trouble point；
Further, during vectogram, construction similar triangles are drawn, specific method is as described below：
Step one, vectogram is drawn；Voltage-current relationship after the system failure according to formula (4), with fault branch zero sequence
Electric currentTo draw circuit head end protection installation place zero sequence measurement electric current after failure with reference to phasorZero sequence measures voltageTrouble point residual voltageFault branch zero-sequence currentInstallation place is protected to line zero between trouble point
Sequence voltagePhasor diagram；ExtensionWithMeet at point B.Accompanying drawing 7 is system residual voltage electricity after line fault
Phasor diagram is flowed, as shown in fig. 7, in figureFor known quantity, and such as trouble point residual voltage in figureProtection is installed
Place is to circuit residual voltage between trouble pointIt can be represented by fault distance percentage, the fault distance percentage is protection
Installation place is to the ratio of circuit zero sequence impedance between trouble point and total track length zero sequence impedance, therefore only fault distance substantially in figure
One unknown quantity of percentage, therefore fault distance percentage equation is set up, and then solve unknown quantity.
Step 2, constructs similar triangles；Boost line construction is added according to voltage x current geometrical property again in the figure 7 similar
Triangle：Cross trouble point residual voltage phasorEnd D, which is done, protects installation place zero sequence measurement voltage after failureHang down
Line DC and OM meets at point C, overprotection installation place zero sequence measurement voltage phasorTerminal M does trouble point residual voltageVertical line
MA and OD meets at point A, as shown in Figure 7.Then with trouble point residual voltageProtect installation place zero sequence measurement voltageVertical line CD and origin O extremelyLine segment OC between its vertical line CD intersection points C is the triangle Δ OCD on side, with event
Barrier point residual voltageVertical line MA, protection installation place zero sequence measurement voltage after failureOrigin O is to failure
Line segment OA is similar for the triangle Δ MAO on side between point residual voltage intersection point A：
First, ∠ MOA are Δ OCD and Δ MAO common angles；Secondly, ∠ MAD=∠ OCD=90 °；Finally, because triangle
Interior angle and all be 180 °, so, Δ OCD and each interior angles of Δ MAO are equal, according to " similar triangles corresponding angles are equal " this phase
Δ OCD~Δ MAO is understood like criterion；
Step 3, solves two similar triangles Δ OCD, each corners of Δ MAO；
(1) circuit residual voltage after failure is solved
In formula, p is fault distance percentage, that is, protects installation place to circuit zero sequence impedance and total track length between trouble point
The ratio of zero sequence impedance, whereinZL0For the zero sequence impedance of total track length, Z0For from protection installation place to trouble point top-stitching
Road zero sequence impedance；
(2) protection installation place zero sequence measurement voltage after failure is solvedThe vertical line section CD on side：
In triangle Δ DCM, DM is protection installation place after failure to circuit residual voltage between trouble pointTherefore by
Sine is understood：CD=DMsin ∠ CMD,For circuit zero sequence impedance angle, the Δ MOB exterior angles for being also, its value is equal to not
Adjacent two interior angles and, i.e.,And ∠ MOB are protection installation place zero sequence measurement electric currentAnd zero sequence
Measure voltageBetween angle, thereforeResult of calculation is as follows：
(3) trouble point residual voltage after barrier is solved
Trouble point residual voltageEqual to protection installation place zero sequence measurement voltageWith faulty line residual voltageIt
Difference is：
(4) trouble point residual voltage is solvedVertical line MA：
In Δ MOA, MA=OMsin ∠ MOA are understood by sine, wherein
That is protection installation place zero sequence measures voltageWith trouble point residual voltagePhase angle difference, therefore：
Further, during construction fault distance equation, and abbreviation solution, specific method is as described below：
Step one：Construct fault distance equation；Understood using Similar Principle of Triangle, each corresponding sides ratio in similar triangles
Value is equal, therefore：Each amount expression formula in formula is brought into and can obtained：
Therefore fault distance percentage p solution formula f (p)：
Because f (p) is only one unknown quantity (fault distance percentage p) transcendental equation, but without analytic solutions, therefore need
Other electric characteristic amounts after resultant fault are used to carry out abbreviation to it.
Step 2：Using other electric characteristic amounts after failure to f (p) abbreviations, and ask fault distance percentage p parsing
Solution.
There is document to point out, protection installation place negative phase-sequence or zero-sequence current can be approximately considered after failure with fault branch with sequence electric current
Same-phase, i.e. negative phase-sequence or zero-sequence current distribution coefficient can be by protecting for fault point voltage phase after real number, therefore single-line to ground fault
Protect installation place negative phase-sequence or zero-sequence current phase approximate representation.At the same time, due to only having zero-sequence network after line fault containing UPFC
Structure is not influenceed by UPFC, so trouble point zero-sequence current phase can approximately be replaced with protection installation place zero sequence measurement current phase
Position, therefore draw：
P analytical expression can be tried to achieve and be by substituting the above in f (p)：
In formula：
Therefore trying to achieve p analytic solutions is:
P takes the value for wherein meeting constraints 0≤p≤1.
Further, during whether I section of protection of judging distance acts, specific method is as described below：
Sample frequency is determined, asks for protecting installation place zero sequence measurement voltage, zero sequence to measure after failure with full-wave fourier algorithm
The fundametal compoment of electric current, the fault distance according to corresponding to formula (12) solves each sampled point, then seek its average pm, then pmAs institute
Fault distance percentage is sought, by pmThe foundation whether acted as I section of protection of judging distance, if pmMeet distance protection action side
Journey, then I section of protection exit action of distance.
Wherein, distance protection operation equation is：pm＜ pset,For I section of setting valve of traditional distance protection.
Embodiment 1
With specific embodiment, the present invention will be further described below.
In 220KV dual power supply systems containing UPFC as shown in Figure 2,Circuit
Length is 100km, and distance protection setting is that 80%, the UPFC rated capacities of total track length are 100MVA.It is public by the art
Know that general knowledge is understood, system maximum possible transition resistance is 100 Ω after the 220KV system failures, therefore takes system respectively through 30 Ω, 60
Ω, 100 Ω, tri- transition resistance values, generation A phase ground short circuit failures are analyzed near protection domain end, it is assumed that failure
Occur after system operation 7s.Experimental data and simulation result using failure initial time be 7s as time zero, and utilize
MATLAB takes after sampled data is filtered through full-wave fourier algorithm in first cycle and calculates gained.Its simulation result such as Fig. 8-Figure 10
It is shown.Rg is transition resistance in figure.Analyzed from simulation result Fig. 8-Figure 10, in the scope of circuit protection domain end ± 5%
Interior, after occurring single-phase earthing fault through different transition resistances, guard method of the invention can rapid solving fault distance, failure
Range error is less than 5%, and the guard method precision is higher and is not influenceed by UPFC and transition resistance, it is ensured that I section of distance
Reliability, quick-action, the selectivity of protection are required.
This embodiment is only the present invention preferably embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can be readily occurred in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (5)
1. the segment protection method of distance I of a kind of UPFC line attachments single-phase grounding fault, it is characterised in that including following step
Suddenly：
Step 1：According to simplifying network analysis figure and combining connection in series-parallel converter power transformer winding connection form, draw and contain UPFC lines
The positive sequence network figure of negative zero three of system, is analyzed each sequence network after failure after the single-phase grounding fault of road, and observation UPFC connects
Enter the influence produced to each sequence network of system after line fault；
Step 2：According to analysis result, with fault branch zero-sequence currentTo draw circuit head end protection peace after failure with reference to phasor
Zero sequence measures electric current at dressZero sequence measures voltageTrouble point residual voltageFault branch zero-sequence currentProtection
Installation place is to circuit residual voltage between trouble pointPhasor diagram；
Step 3：Addition boost line builds similar triangles in the phasor diagram that step 2 is drawn, and solves two using geometric knowledge
Individual each corner of similar triangles；
Step 4：Fault distance Equation f (p), and profit are constructed using the equal general principle of each corresponding sides ratio in similar triangles
Installation place zero sequence is protected to measure electric current with after failureWith fault branch zero-sequence currentFeature to fault distance Equation f (p)
Abbreviation is carried out, fault distance percentage p analytical expression is drawn, by protection installation place zero sequence measurement voltageZero sequence is measured
Electric currentSampled value bring into analytical expression, solve fault distance percentage p analytic solutions, and solve fault localization average
pm；
Step 5：By the fault localization average p obtained by step 4mBring distance protection operation equation into, whether is I section of protection of judging distance
Action.
2. a kind of segment protection method of circuit distance I accessed suitable for THE UPFC according to claim 1, its
It is characterised by, the fault distance Equation f (p) is：
In formula：Voltage is measured for circuit head end protection installation place zero sequence after failure,Installed for circuit head end protection after failure
Locate zero sequence measurement electric current,For circuit zero sequence impedance angle, p is fault distance percentage, that is, protects installation place between trouble point
The ratio of line length and total track length, ZL0For the zero sequence impedance of total track length.
3. a kind of segment protection method of circuit distance I accessed suitable for THE UPFC according to claim 1, its
It is characterised by, the analytical expression of the fault distance percentage p is：
<mrow>
<mi>p</mi>
<mo>=</mo>
<mfrac>
<mrow>
<mo>|</mo>
<msub>
<mover>
<mi>U</mi>
<mo>&CenterDot;</mo>
</mover>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>|</mo>
<mo>&CenterDot;</mo>
<mo>&lsqb;</mo>
<mo>-</mo>
<msub>
<mi>K</mi>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>L</mi>
<mn>0</mn>
</mrow>
</msub>
</mrow>
</msub>
<mo>&PlusMinus;</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>K</mi>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
</mrow>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<msup>
<mi>C</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mrow>
<mn>1</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>&rsqb;</mo>
</mrow>
<mrow>
<mo>(</mo>
<msup>
<mi>C</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
<mo>|</mo>
<msub>
<mover>
<mi>U</mi>
<mo>&CenterDot;</mo>
</mover>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
<mo>|</mo>
</mrow>
</mfrac>
</mrow>
In formula：
For after failure circuit head end protection installation place zero sequence measurement voltage,Installation place zero is protected for circuit head end after failure
Sequence measures electric current；ZL0For the zero sequence impedance of total track length,For circuit zero sequence impedance angle, C,For centre
Variable.
4. a kind of segment protection method of circuit distance I accessed suitable for THE UPFC according to claim 1, its
It is characterised by, the analytic solutions of the fault distance percentage p are：
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<msub>
<mi>p</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mo>|</mo>
<msub>
<mover>
<mi>U</mi>
<mo>&CenterDot;</mo>
</mover>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>|</mo>
<mo>&CenterDot;</mo>
<mo>&lsqb;</mo>
<mo>-</mo>
<msub>
<mi>K</mi>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
</mrow>
</msub>
<mo>+</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>K</mi>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
</mrow>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<msup>
<mi>C</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mrow>
<mn>1</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>&rsqb;</mo>
</mrow>
<mrow>
<mo>(</mo>
<msup>
<mi>C</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
<mo>|</mo>
<msub>
<mover>
<mi>U</mi>
<mo>&CenterDot;</mo>
</mover>
<mrow>
<mi>L</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>|</mo>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<msub>
<mi>p</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mo>|</mo>
<msub>
<mover>
<mi>U</mi>
<mo>&CenterDot;</mo>
</mover>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>|</mo>
<mo>&CenterDot;</mo>
<mo>&lsqb;</mo>
<mo>-</mo>
<msub>
<mi>K</mi>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
</mrow>
</msub>
<mo>-</mo>
<msup>
<mrow>
<mo>(</mo>
<msubsup>
<mi>K</mi>
<mrow>
<msub>
<mi>U</mi>
<mrow>
<mi>m</mi>
<mn>0</mn>
</mrow>
</msub>
<mo>&CenterDot;</mo>
<msub>
<mi>U</mi>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
</mrow>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<msup>
<mi>C</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
</mrow>
<mrow>
<mn>1</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>&rsqb;</mo>
</mrow>
<mrow>
<mo>(</mo>
<msup>
<mi>C</mi>
<mn>2</mn>
</msup>
<mo>-</mo>
<mn>1</mn>
<mo>)</mo>
<mo>|</mo>
<msub>
<mover>
<mi>U</mi>
<mo>&CenterDot;</mo>
</mover>
<mrow>
<mi>L</mi>
<mn>01</mn>
</mrow>
</msub>
<mo>|</mo>
</mrow>
</mfrac>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
P takes the value for wherein meeting constraints 0≤p≤1；
In formula,
For after failure circuit head end protection installation place zero sequence measurement voltage,Installation place zero is protected for circuit head end after failure
Sequence measures electric current；For circuit zero sequence impedance angle, ZL0For the zero sequence impedance of total track length；To protect installation place after failure
To circuit residual voltage between trouble point.
5. a kind of segment protection method of circuit distance I accessed suitable for THE UPFC according to claim 1, its
It is characterised by, I section of the judging distance protects the method whether acted as follows：
Sample frequency is determined, the fundametal compoment of sampled data in the first cycle after failure is asked for full-wave fourier algorithm, according to event
The analytical expression hindered apart from percentage p solves the fault distance corresponding to each sampled point, then seeks its average pm, then pmAs institute
Fault distance percentage is sought, by pmThe foundation whether acted as I section of protection of judging distance, if pmMeet distance protection action side
Journey, then I section of protection exit action of distance；
The distance protection operation equation is：pm＜ pset；
Wherein, psetFor I section of setting valve of traditional distance protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710362529.1A CN107086549B (en) | 2017-05-22 | 2017-05-22 | I segment protection method of distance of UPFC line attachment single-phase grounding fault |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710362529.1A CN107086549B (en) | 2017-05-22 | 2017-05-22 | I segment protection method of distance of UPFC line attachment single-phase grounding fault |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107086549A true CN107086549A (en) | 2017-08-22 |
| CN107086549B CN107086549B (en) | 2018-12-18 |
Family
ID=59607433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710362529.1A Expired - Fee Related CN107086549B (en) | 2017-05-22 | 2017-05-22 | I segment protection method of distance of UPFC line attachment single-phase grounding fault |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107086549B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872768A (en) * | 2018-06-11 | 2018-11-23 | 国网湖北省电力有限公司宜昌供电公司 | One kind pressing off the accurate test method of negative phase-sequence element in lock again |
| CN112698147A (en) * | 2020-12-03 | 2021-04-23 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN114696304A (en) * | 2022-04-24 | 2022-07-01 | 天津大学 | Single-end protection method of alternating current transmission line based on UPFC boundary |
| CN114994465A (en) * | 2022-08-01 | 2022-09-02 | 西安兴汇电力科技有限公司 | Single-phase high-resistance grounding criterion method based on impedance triangle type high-voltage overhead line |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
| CN105207186A (en) * | 2015-11-02 | 2015-12-30 | 江苏省电力公司电力科学研究院 | Distance protection method for power transmission line containing unified power flow controller |
| CN105826908A (en) * | 2016-05-11 | 2016-08-03 | 许继集团有限公司 | Quick distance protection method and apparatus for power transmission line containing UPFC |
| CN106340862A (en) * | 2016-10-26 | 2017-01-18 | 南京南瑞继保电气有限公司 | Distance protection method for power transmission line with serial connection equipment |
-
2017
- 2017-05-22 CN CN201710362529.1A patent/CN107086549B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104134968A (en) * | 2014-08-05 | 2014-11-05 | 南京南瑞继保电气有限公司 | Protection method and system for unified power flow controller |
| CN105207186A (en) * | 2015-11-02 | 2015-12-30 | 江苏省电力公司电力科学研究院 | Distance protection method for power transmission line containing unified power flow controller |
| CN105826908A (en) * | 2016-05-11 | 2016-08-03 | 许继集团有限公司 | Quick distance protection method and apparatus for power transmission line containing UPFC |
| CN106340862A (en) * | 2016-10-26 | 2017-01-18 | 南京南瑞继保电气有限公司 | Distance protection method for power transmission line with serial connection equipment |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108872768A (en) * | 2018-06-11 | 2018-11-23 | 国网湖北省电力有限公司宜昌供电公司 | One kind pressing off the accurate test method of negative phase-sequence element in lock again |
| CN108872768B (en) * | 2018-06-11 | 2020-09-22 | 国网湖北省电力有限公司宜昌供电公司 | Accurate test method for negative sequence element in double-voltage lockout |
| CN112698147A (en) * | 2020-12-03 | 2021-04-23 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN112698147B (en) * | 2020-12-03 | 2024-02-06 | 国网重庆市电力公司市区供电分公司 | Power line fault point positioning method based on instantaneous phase consistency |
| CN114696304A (en) * | 2022-04-24 | 2022-07-01 | 天津大学 | Single-end protection method of alternating current transmission line based on UPFC boundary |
| CN114994465A (en) * | 2022-08-01 | 2022-09-02 | 西安兴汇电力科技有限公司 | Single-phase high-resistance grounding criterion method based on impedance triangle type high-voltage overhead line |
| CN114994465B (en) * | 2022-08-01 | 2022-11-22 | 西安兴汇电力科技有限公司 | Impedance triangle-based high-voltage overhead line single-phase high-resistance grounding criterion method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107086549B (en) | 2018-12-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103308823B (en) | A kind of power distribution network single-phase disconnection phase to phase fault localization method | |
| CN103792465B (en) | A kind of method of the range finding of the one-phase earthing failure in electric distribution network based on residual voltage | |
| CN103149502B (en) | Based on the fault positioning method for transmission line of synchronized sampling unit | |
| CN106154116B (en) | A kind of distribution net work earthing fault localization method | |
| CN102135571B (en) | Anti-interference measurement method for zero sequence impedance of super-high-voltage/ultrahigh-voltage multi-loop power transmission line | |
| CN102435851B (en) | Method for measuring zero-sequence parameters of double-circuit transmission lines | |
| CN100570791C (en) | A kind of single phase ground fault relay protecting method based on the negative sequence reactance relay | |
| CN102175954B (en) | Circuit inter-phase fault single-end ranging method | |
| CN104898021B (en) | A kind of distribution network fault line selection method based on k means cluster analyses | |
| CN109283430B (en) | Power distribution network fault location method based on voltage distribution principle | |
| CN107086549B (en) | I segment protection method of distance of UPFC line attachment single-phase grounding fault | |
| CN107104420B (en) | I segment protection method of route distance suitable for THE UPFC access | |
| CN105811383A (en) | Novel positive sequence impedance differential protection method of microgrid | |
| CN104914322A (en) | Area line earth parameter detection method and application in the aspect of earth fault area positioning | |
| CN107064736B (en) | A kind of Fault Locating Method connecing inverse distributed power power distribution network containing more T | |
| CN105917539A (en) | Method and apparatus of reactor turn-to-turn protection | |
| CN104808114B (en) | The earth fault line selection method of wide area zero sequence spread voltage feature | |
| CN104377667A (en) | High-voltage direct-current line pilot protection method based on boundary energy | |
| CN103116097A (en) | Device parameter online identification method based on multi-section hybrid measurement information | |
| CN101478148A (en) | Failure direction determination process for electric system AC electricity transmission line | |
| CN104237677B (en) | 220kV and above power network list back transmission line Zero sequence parameter on-line identification method | |
| CN105223471A (en) | Based on power transmission line fault locating method, the protective relaying device of line parameter circuit value | |
| CN102170114B (en) | High-voltage direct-current transmission line low-voltage protective method | |
| CN207705796U (en) | A kind of multifunctional ligand power grid flexible ground device | |
| Yong et al. | Single phase to earth fault location method in distribution network based on signal injection principle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181218 Termination date: 20190522 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |