CN106972452B - Utilize the adaptive reclosing method of three-phase of shunt reactor mould power frequency feature - Google Patents
Utilize the adaptive reclosing method of three-phase of shunt reactor mould power frequency feature Download PDFInfo
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- CN106972452B CN106972452B CN201710288695.1A CN201710288695A CN106972452B CN 106972452 B CN106972452 B CN 106972452B CN 201710288695 A CN201710288695 A CN 201710288695A CN 106972452 B CN106972452 B CN 106972452B
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- fault
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- mould
- shunt reactor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/06—Details with automatic reconnection
- H02H3/066—Reconnection being a consequence of eliminating the fault which caused disconnection
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of adaptive reclosing methods of three-phase using shunt reactor mould power frequency feature, after route fault trip, analyze according to Fault Phase Selection as a result, choosing different phase mode transformation matrix and phase system being converted into modular system；The initial time of Judging fault property is at the time of can't detect power frequency component in shunt reactor mould electric current；Differentiating in the time, is distinguishing permanent fault and transient fault according to 1 mould of shunt reactor, 2 moulds and 0 mould current oscillation frequecy characteristic.This method can identify nature of trouble before three_phase reclosing, without reclosing if being judged to permanent fault, avoid and coincide with permanent fault and carry out secondary pulse to system and equipment belt.
Description
Technical field
The invention belongs to transmission line of electricity reclosing fields, and in particular to a kind of to utilize shunt reactor mould power frequency feature
The adaptive reclosing method of three-phase.
Background technique
Traditional automatic reclosing does not distinguish instantaneity and permanent fault before movement.Transient fault occurs in route
After tripping, by automatic reclosing, can fast recovery of power supply can be made to electric system but when coinciding with permanent fault
At secondary pulse, the damage of acceleration equipment.Therefore, adaptive reclosing of the research with nature of trouble recognition capability has important
Meaning.
Currently, the research of single-phase adaptive reclosing is more mature.Single-pole reclosing takes single-phase fault tripping single-phase, warp
It crosses constant time lag and is overlapped single-phase strategy.The two-phase not broken down can continue to run, to improve power supply reliability and be
System stability.But there are some problems for single-pole reclosing, and such as: 1) secondary arc current makes fault point be not easy blow-out；2) non-three phase is transported
There are negative phase-sequences and zero-sequence component in electrical quantity when row.Therefore, more closely regional in interconnection, it coincides frequently with three
Lock.Nature of trouble is not differentiated before general three_phase reclosing, if coinciding with permanent fault, it is possible to system and
Equipment belt carrys out secondary pulse.
Summary of the invention
The purpose of the present invention is to provide a kind of three-phases using shunt reactor mould power frequency feature to be adaptively overlapped
Lock method avoids coinciding with permanent event so that can differentiate nature of trouble before transmission line of electricity three_phase reclosing
Hinder and carrys out secondary pulse to system and equipment belt.
In order to achieve the above objectives, the technical scheme is that
Using the adaptive reclosing method of three-phase of shunt reactor mould power frequency feature, shunt reactor is installed in defeated
Electric line unilateral or bilateral, the adaptive reclosing method use of three-phase is in band shunt reactor side, comprising the following steps:
1) shunt reactor three-phase current is acquired after transmission line of electricity tripping, and whether Judging fault is BC line to line fault；Such as
Fruit is shunt reactor three-phase current progress phase-model transformation of the BC line to line fault using T' to acquisition, if not BC line to line fault
Phase-model transformation is carried out to shunt reactor three-phase current using T；
2) shunt reactor mould power frequency is measured, power frequency component in shunt reactor mould electric current is found out and disappears the moment；
3) differentiate the time in, if from differentiate the time in sometime to differentiate the time terminate, shunt reactor
Each mould electric current meet criterion, then be judged to transient fault；It cannot be judged to transient fault and then be judged to permanent fault；If it is
Transient fault carries out three_phase reclosing, if it is permanent fault without three_phase reclosing.
Further, the transformation matrix that phase-model transformation uses in step 1), it is related with Fault Phase Selection result, if failure is not
BC line to line fault, transformation matrix areIf failure is BC line to line fault, transformation matrix is
Further, step 3) specifically: differentiating in the time, if from differentiate in the time sometime to differentiation
Time terminates, and each mould electric current of shunt reactor contains only a kind of low-frequency component and satisfactionIt is then judged to instantaneous
Property failure, wherein f1_est、f2_estAnd f0_est1 mould of shunt reactor, 2 moulds and 0 mould power frequency, the K respectively measured is nargin
Coefficient；It cannot be judged to transient fault and then be judged to permanent fault；Three_phase reclosing is carried out if it is transient fault, if it is
Permanent fault is without three_phase reclosing；
It trips in transmission line of electricity two sides and after the arc extinction of fault point, each mould electric current of shunt reactor contains only a kind of low frequency
Ingredient, 1 mould current oscillation frequency are2 mould current oscillation frequencies are f1, 0 mould current oscillation frequency isWherein L1For 1 mould entered in terms of from fault point to system or 2 lay wire network equivalent inductances, C1For from fault point to
1 mould or 2 lay wire network equivalent capacitys that system is seen into, L0For the 0 lay wire network equivalent inductance entered in terms of from fault point to system, C0
The 0 lay wire network equivalent capacity seen into for fault point to system.
Further, K can use the arbitrary number in [0.05,0.1].
Further, the initial time for differentiating the time is that power frequency component disappears the moment in shunt reactor mould electric current.
Further, differentiate the blow-out time of fault point when the time is greater than transmission line of electricity transient fault.
Shunt reactor mould power frequency feature trips and fault point arc extinction for transient fault in two sides
Afterwards, each mould electric current of shunt reactor contains only a kind of low-frequency component, and 1 mould current oscillation frequency isThe vibration of 2 mould electric currents
Swinging frequency is f1, 0 mould current oscillation frequency isWherein L1For 1 mould or 2 moulds entered in terms of from fault point to system
Network equivalent inductance, C1For 1 mould entered in terms of from fault point to system or 2 lay wire network equivalent capacitys, L0For from fault point to system
The 0 lay wire network equivalent inductance seen into, C0The 0 lay wire network equivalent capacity seen into for fault point to system.
Shunt reactor mould power frequency feature, for permanent fault, after two sides are tripped, shunt reactor mould electricity
Flow frequency of oscillation it is related with fault type, altogether there are three types of may, perhaps be not present low-frequency component perhaps there are beat frequency or 1,
2,0 mould electric current containing only a kind of low-frequency component but is not f respectively1、f1、f0。
Further, the shunt reactor mould power frequency feature, be using failure boundary condition, by phase-model transformation,
It obtains compound die network, and then analyzes and to obtain.
Further, the initial time for differentiating the time is that route two sides are all tripped the moment.
Further, the moment is tripped all to can't detect power frequency point in this side shunt reactor mould electric current in the route two sides
Measure the moment.
It further, is failure when the time must be greater than transient fault under normal conditions to the requirement for differentiating the time
The blow-out time of point, to guarantee that permanent fault will not be mistaken for because of the non-blow-out in fault point.
Compared with the existing technology, the invention has the following advantages: the present invention is a kind of to utilize shunt reactor mould electric current
The adaptive reclosing method of the three-phase of frequecy characteristic, carries out property judgment before reclosing, is avoided that and coincides with permanently
Failure carrys out secondary pulse to system and equipment belt.
Detailed description of the invention
Fig. 1 is both ends band shunt reactor transmission system schematic diagram；
Fig. 2 be from fault point to system in terms of the 1 mould network entered；
Fig. 3 is the compound die network of transient fault；Wherein Fig. 3 (a) is time domain；Fig. 3 (b) is complex frequency domain；
Fig. 4 is the compound die network of permanent BG failure；Wherein Fig. 4 (a) is time domain；Fig. 4 (b) is complex frequency domain；
The mould electric current and low-frequency oscillation frequency of the side M shunt reactor when Fig. 5 is instantaneity AG failure (=300)；Wherein Fig. 5
It (a) is 1 mould electric current；Fig. 5 (b) is 1 mould low-frequency oscillation frequency；Fig. 5 (c) is 2 mould electric currents；Fig. 5 (d) is 2 mould low-frequency oscillation frequencies；
Fig. 5 (e) is 0 mould electric current；Fig. 5 (f) is 0 mould low-frequency oscillation frequency；
Fig. 6 is the differentiation flow chart of this method.
Specific embodiment
It elaborates with reference to the accompanying drawings and examples to the present invention.
Fig. 1 is both ends band shunt reactor transmission system.G in Fig. 1mAnd GnRespectively indicate the AC power source at both ends, XmAnd Xn
For the equivalent impedance of AC power source, Lp1、Lp2And Ln1、Ln2The respectively inductance value of shunt reactor and small reactor on neutral point device.
Electrical quantity is converted into from phase region by modular field, transformation for mula using triumphant human relations Bell formula are as follows:
After the tripping of both ends, since line reactance is much smaller than the reactance of shunt reactor and the capacitive reactance of line capacitance, in lay wire
It can ignore in network, therefore be believed that mould power frequency is not influenced by abort situation.1 lay wire network of system is as shown in Figure 2.2 moulds
Network is identical as 1 lay wire network, and 0 lay wire network is also similar with 1 lay wire network, and only mould network parameter is different.Use L1、L2And L0It respectively indicates
1 mould, 2 moulds and the 0 lay wire network equivalent inductance entered in terms of from fault point to system, use C1、C2And C0It respectively indicates from fault point to being
1 mould, 2 moulds and the 0 lay wire network equivalent capacity that system is seen into, it is assumed that both ends shunt reactor parameter is identical, then L1=L2=Lp1/ 2,
L0=(Lp1+3Ln1)/2, and C1、C2And C0For equivalent 1 mould of line capacitance, 2 moulds and 0 modulus value.
Below by failure boundary condition, compound die network is analyzed, and then analyzes shunt reactor mould current oscillation frequency.
For transient fault, after both ends tripping and fault point blow-out, fault point three-phase current ia、ib、icMeet:
ia=ib=ic=0
It is converted into modulus i1、i2、i0Afterwards, modulus meets
i0=i1=i2=0
Compound die network is open network, and such as Fig. 3 (a) and 3 (b) is shown respectively for time domain and complex frequency domain form, I in figurei′
(s) shaped likeαi、βiFor constant (i=1,2,0) related with initial value.
1 mould electric current of shunt reactor is solved in the compound die network of complex frequency domain form is
Then know that its frequency of oscillation is
Similarly, 2 moulds and 0 mould current oscillation frequency can be obtained.
For permanent fault, by taking BG failure as an example, after the tripping of route both ends, fault point B phase voltage ubFor 0, AC two
Phase current ia、icIt is 0, i.e.,
It is converted into modulus, and analyzes and obtains compound die network as shown in figure 4, in turn shunt reactor can be solved by Fig. 4
Each mould electric current and its frequency of oscillation.
Frequency of oscillation under various fault types is as shown in table 1.In table, " " indicate that low frequency component is not present.
The frequency of oscillation of 1 shunt reactor mould electric current low frequency components of table
Table 1 is to carry out the result that phase-model transformation obtains using T.As shown in Table 1, when BC two-phase instantaneity is with permanent fault
Frequency of oscillation is identical, can not be distinguished according to frequecy characteristic.Because ABC three-phase Cyclic Symmetry selects if the column of displacement T in failure
Following transformation matrix is used when phase result is BC two-phase
Then the mould current oscillation frequency under BC two-phase permanent fault by with the frequency phase under AB permanent fault in table 1
Together, i.e. 1 mould electric current is free of frequency of oscillation, and the mould current oscillation frequency under BC two-phase transient fault is still as shown in table 1.
Therefore, for transient fault, each mould electric current of shunt reactor contains only a kind of low-frequency component；For permanent event
Barrier, the frequency of oscillation of shunt reactor mould electric current is related with fault type, low-frequency component may be not present, or very containing one kind
To two kinds of low-frequency components.
If the parameter of Fig. 1 system is as follows:
System order parameter: X1m=49.36 Ω, X0m=41.34 Ω, X1n=46.03 Ω, X0n=103.36 Ω；
Route order parameter: Bergeron model, l=358km, R are used1_line=19.5m Ω/km, R0_line=167.5m
Ω/km, L1_line=913.4 μ H/km, L0_line=2.739mH/km, C1_line=14nF/km, C0_line=3.5nF/km；
Shunt reactor: Lp1=Lp2=15.35H；
Small reactor on neutral point device: Ln1=Ln2=1.38H.
The then f that theoretical calculation obtains1=25.66Hz, f0=45.54Hz, fp=33.62Hz, fq=28.56Hz.
The property judgment time is taken as 0.2s, and the K in criterion is taken as 0.05.
AG failure, R are set in simulationsf=300 Ω, fault point distance M side 200km.Fault moment is 0.45s, 0.5s
The breaker tripping of the side M, the breaker tripping of the side 0.55s N, the blow-out of the fault point 0.6s.1 mould, 2 moulds, the 0 mould electricity of the side M shunt reactor
Flow iL1、iL2And iL0And frequency of oscillation is as shown in Figure 5.
Such as Fig. 5, before route two sides are all tripped, there are power frequency components in shunt reactor mould electric current, all trip in two sides
Afterwards, power frequency component disappears.Differentiating in time (0.55s~0.75s), the low-frequency oscillation frequency extracted by matrix pencil algorithm exists
It tends towards stability after 0.62s, 1 mould, 2 moulds and 0 mode oscillation frequency are about 25.62Hz, 25.62Hz and 45.35Hz, 0.62s~0.75s
Criterion meets always, is judged to transient fault.
The adaptive reclosing method property judgment process of three-phase is as shown in Figure 6.
Claims (3)
1. utilizing the adaptive reclosing method of three-phase of shunt reactor mould power frequency feature, which is characterized in that parallel reactance
Device is installed in transmission line of electricity unilateral or bilateral, the adaptive reclosing method use of three-phase in band shunt reactor side, including
Following steps:
1) shunt reactor three-phase current is acquired after transmission line of electricity tripping, and whether Judging fault is BC line to line fault；If it is
BC line to line fault carries out phase-model transformation using shunt reactor three-phase current of the T' to acquisition, uses if not BC line to line fault
T carries out phase-model transformation to shunt reactor three-phase current；
2) shunt reactor mould power frequency is measured, power frequency component in shunt reactor mould electric current is found out and disappears the moment；
3) differentiate the time in, if from differentiate the time in sometime to differentiate the time terminate, shunt reactor it is each
Mould electric current meets criterion, then is judged to transient fault；It cannot be judged to transient fault and then be judged to permanent fault；If it is instantaneous
Property failure carry out three_phase reclosing, if it is permanent fault without three_phase reclosing；
The transformation matrix that phase-model transformation uses in step 1), it is related with Fault Phase Selection result, if failure is not BC line to line fault, become
Changing matrix isIf failure is BC line to line fault, transformation matrix is
Step 3) specifically: differentiating in the time, if from differentiate in the time sometime to differentiating that the time terminates, it is in parallel
Each mould electric current of reactor contains only a kind of low-frequency component and satisfactionIt is then judged to transient fault, wherein
f1_est、f2_estAnd f0_est1 mould of shunt reactor, 2 moulds and the 0 mould power frequency respectively measured, K are nargin coefficient；It cannot sentence
Permanent fault is then judged to for transient fault；Three_phase reclosing is carried out if it is transient fault, if it is permanent fault
Without three_phase reclosing；
Trip in transmission line of electricity two sides and after the arc extinction of fault point, each mould electric current of shunt reactor contain only a kind of low frequency at
Point, 1 mould current oscillation frequency is2 mould current oscillation frequencies are f1, 0 mould current oscillation frequency isWherein L1For 1 mould entered in terms of from fault point to system or 2 lay wire network equivalent inductances, C1For from fault point to
1 mould or 2 lay wire network equivalent capacitys that system is seen into, L0For the 0 lay wire network equivalent inductance entered in terms of from fault point to system, C0
The 0 lay wire network equivalent capacity seen into for fault point to system；
The initial time for differentiating the time is that power frequency component disappears the moment in shunt reactor mould electric current.
2. the three-phase adaptive reclosing method according to claim 1 using shunt reactor mould power frequency feature,
It is characterized in that, K is the arbitrary number in [0.05,0.1].
3. the three-phase adaptive reclosing method according to claim 1 using shunt reactor mould power frequency feature,
It is characterized in that, differentiating the blow-out time of fault point when the time is greater than transmission line of electricity transient fault.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219712A (en) * | 2013-03-12 | 2013-07-24 | 西安工程大学 | Power transmission line one-phase malfunction property identification method based on natural frequency |
| CN104237703A (en) * | 2014-09-30 | 2014-12-24 | 浙江大学 | Method for recognizing properties of three-phase adaptive re-closing faults of lines with parallel reactors |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219712A (en) * | 2013-03-12 | 2013-07-24 | 西安工程大学 | Power transmission line one-phase malfunction property identification method based on natural frequency |
| CN104237703A (en) * | 2014-09-30 | 2014-12-24 | 浙江大学 | Method for recognizing properties of three-phase adaptive re-closing faults of lines with parallel reactors |
Non-Patent Citations (2)
| Title |
|---|
| 利用自由振荡频率识别的三相重合闸永久性故障判别;梁振锋等;《中国电机工程学报》;20130305;第33卷(第7期);第124-130页 |
| 带并联电抗器输电线路三相自适应重合闸永久性故障判别;邵文权等;《中国电机工程学报》;20100205;第30卷(第4期);第91-98页 |
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