CN104505813A - Power transmission line pilot protection method for simulation-after-test by using instantaneous power under Bergeron circuit model - Google Patents
Power transmission line pilot protection method for simulation-after-test by using instantaneous power under Bergeron circuit model Download PDFInfo
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- CN104505813A CN104505813A CN201410468718.3A CN201410468718A CN104505813A CN 104505813 A CN104505813 A CN 104505813A CN 201410468718 A CN201410468718 A CN 201410468718A CN 104505813 A CN104505813 A CN 104505813A
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Abstract
The invention provides a power transmission line pilot protection method for simulation-after-test by using instantaneous power under a Bergeron circuit model, and belongs to the technical field of power system relay protection. Three-phase voltage and current values actually measured on two ends of a power transmission line are respectively used to calculate simulation voltage and current of the midpoint of the power transmission line according to the Bergeron model, two simulation instantaneous powers calculated from two ends of the line to the midpoint are respectively solved, the powers are summed and then integral is performed in a 0.15 ms time window. If the integral value is lower than a setting value, the method determines that a protected line does not have fault. If the integral value is larger than the setting value, the line is determined to have faults. Thus, pilot protection on a power transmission line is realized. Theoretical analysis and large amount of simulation show that the power transmission line pilot protection method for simulation-after-test using instantaneous power is effective.
Description
Technical field
The present invention relates to a kind of instantaneous power that utilizes under Bei Jielong circuit model and carry out the electric transmission line longitudinal protection method of Simulation after test, belong to Relay Protection Technology in Power System field.
Background technology
At present, the protection extensively adopted in transmission line of alternation current has: current protection, direction comparison expression pilot protection, distance protection etc.In these protection operations in the past, Performance comparision is excellent on the whole, but traditional protection, in order to increase the length of protection circuit, all using the time limit of lifting ac as cost, therefore fault can not be excised relatively rapidly.The interconnected of electrical network is had higher requirement to relay protection of power system, and after line fault, quickly and reliably removing fault is the effective measures increasing multi-line power transmission ability and improve Power Network Transient Stability.In transmission line of alternation current, protective device only needs reliably to distinguish in district, external area error, without the need to accurately finding range within the scope of all fronts.Because transient state component is usually much bigger than steady-state component; transient current signal more can fully demonstrate fault signature; and transient is not by the impact of power frequency phenomenon; after fault, moment transient response is very fast; therefore the simulated power calculated by analog current also can embody fault signature, so the protection utilizing instantaneous power to form can be distinguished in district reliably, rapidly, external area error.
Summary of the invention
The technical problem to be solved in the present invention distinguishes reliability and the rapidity of internal fault external fault, proposes a kind of instantaneous power that utilizes under Bei Jielong circuit model and carry out the electric transmission line longitudinal protection method of Simulation after test.
Technical scheme of the present invention is: a kind of instantaneous power that utilizes under Bei Jielong circuit model carries out the electric transmission line longitudinal protection method of Simulation after test, by the three-phase voltage that transmission line two ends are surveyed, current value presses analog voltage and the electric current of circuit Bei Jielong model computing electric power line mid point respectively, try to achieve two the simulation instantaneous powers of circuit two ends reckoning to mid point respectively, in short time-window, integration is carried out after they being sued for peace, if this integrated value is less than setting value, then be judged to protected circuit not break down, if this integrated value is more than or equal to setting value, then be judged to line fault, thus realize the pilot protection of transmission line.
Concrete steps are:
After the first step, protected transmission line of alternation current MN break down, in short time window, obtain the three-phase voltage u of measuring end M and measuring end N
mk, u
nk, three-phase electricity flow valuve i
mk, i
nk(k=a, b, c), then tries to achieve the analog voltage u of circuit two ends reckoning to mid point according to the electric current and voltage regularity of distribution of Bei Jielong circuit model
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2;
Second step, according to analog voltage u
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2through type (1) and formula (2) ask for simulated power p
m, l/2and p
n, l/2;
3rd step, the simulated power p that will try to achieve
m, l/2, p
n, l/20.15ms time window in summation and carry out integration by following formula, obtain integrated value δ;
T in formula (3)
1for integration initial time, t
2for the integration end time, t
2=t
1+ 0.15;
4th step, the magnitude relationship between integrated value δ and setting value is utilized to judge protected circuit whether fault by formula (4), (5),
If δ is <k
1δ
set, then the non-fault of protected line (4)
If δ>=k
1δ
set, then protected line fault (5)
In formula (4), (5), δ
setfor under protected circuit non-failure conditions, calculate the short time-window integration maximum of gained power sum, k
1for safety factor.
3, a kind of instantaneous power that utilizes under Bei Jielong circuit model according to claim 1 and 2 carries out the electric transmission line longitudinal protection method of Simulation after test; it is characterized in that: the short time-window length chosen during calculating simulation power integral value is 0.15ms, safety factor k
1be taken as 1.2; PSCAD/EMTDC electromagnetic transient simulation software is utilized to carry out protected circuit failure condition traversal emulation completely, by δ
setadjust is 200.
Principle of the present invention is:
1, Transmission Line Distributed Parameter model
The computational methods of Bei Jielong model are the characteristic strips equation of the wave process utilized on circuit, through certain conversion, be resistive network the equivalent line of distributed constant, then use the method solving resistive network to calculate a kind of method of the transient process of whole network.Single harmless line can be equivalent to two sections of harmless lines that two topologys are not contacted directly during computing electric power line transient process.Bei Jielong model be meet under requirement of engineering condition to the one of uniform transmission line be similar to.As can be seen from Figure 1, Bei Jielong circuit model evenly damages transmission line exactly and is divided into 2 sections of even lossless transmission lines by one section, and line resistance decomposes several to circuit both sides by every section.A large amount of engineerings is actual to be shown, so approximate be feasible.
2, the examination of external area error in the transmission line district carrying out Simulation after test based on instantaneous power
After breaking down in alternating current circuit, in short time window, actual measurement transmission line head end M point and end N point three-phase voltage u
mk, u
nk, three-phase electricity flow valuve i
mk, i
nk(k=a, b, c), then tries to achieve the analog voltage u of circuit two ends reckoning to mid point according to the electric current and voltage regularity of distribution of Bei Jielong circuit model
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2, according to analog voltage u
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2ask for simulated power p
m, l/2and p
n, l/2.Then the simulated power p of gained will be calculated
m, l/2, p
n, l/20.15ms time window in sue for peace and press
carry out integration, obtain integrated value δ.Protected circuit whether fault is judged according to criterion.Concrete criterion is as follows:
If δ is <k
1δ
set, then the non-fault of protected line.
If δ>=k
1δ
set, then protected line fault.
The invention has the beneficial effects as follows: the present invention can under the prerequisite in not lifting ac time limit, the total length of protection protected circuit; This method is less by the impact of fault initial angle; This method utilizes the route protection of two ends transient information structure reliably can identify internal fault external fault, not by the impact of transition resistance and capacitance current, and can correct high resistive fault inside and outside identification circuit district; This method sample frequency is 20kHz, and meet current hardware condition, scene easily realizes.Time window very short (15ms), can screen internal fault external fault rapidly, realizes protection at a high speed.
Accompanying drawing explanation
Fig. 1 is the transmission system structural representation of embodiment 1,2,3;
Fig. 2 is according to the simulated power that circuit mid point analog voltage and analog current are asked in embodiment 1;
Fig. 3 is according to the simulated power that circuit mid point analog voltage and analog current are asked in embodiment 2;
Fig. 4 is according to the simulated power that circuit mid point analog voltage and analog current are asked in embodiment 3;
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
Embodiment 1:500kV transmission line of alternation current system as shown in Figure 1.Adopt Bei Jielong circuit model, if protected circuit is MN, line length l
pM=150km, l
mN=150km, l
nQ=220km.α mould wave impedance Z under power frequency
c=237.5423 Ω, v
1=2.98 × 10
8m/s, line resistance rate R
1=2.8143 × 10-5 Ω/m; Line parameter circuit value is: L
1=1mH, C
1=3466pF, L
2=2.22mH, C
2=1583pF, R=800 Ω.Sample rate is 20kHz.Now suppose to hold 40km that A phase earth fault occurs apart from M on circuit PM, the initial phase angle of fault is 90 °, and transition resistance is 100 Ω.The three-phase voltage u of measuring end M and measuring end N in window during 1ms after obtaining from fault moment
mk, u
nk, three-phase electricity flow valuve i
mk, i
nk(k=a, b, c), then tries to achieve the analog voltage u of circuit two ends reckoning to mid point according to the electric current and voltage regularity of distribution of Bei Jielong circuit model
mk, l/2, u
nk, l/2, analog current i
mk, l/2, i
nk, l/2;
Again according to analog voltage u
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2simulated power p is asked for by formula (1), (2)
m, l/2and p
n, l/2, as shown in Figure 2;
The simulated power p of gained will be calculated
m, l/2, p
n, l/20.15ms time window in sue for peace and carry out integration by formula (3), obtain integrated value δ=3.603.Due to δ <240, meet formula (4), be therefore judged to the non-fault of protected circuit.
Embodiment 2:500kV transmission line of alternation current system as shown in Figure 1.Adopt Bei Jielong circuit model, if protected circuit is MN, line parameter circuit value is with embodiment 1.Now suppose to hold 50km that A phase earth fault occurs apart from M on circuit MN, the initial phase angle of fault is 90 °, and transition resistance is 100 Ω.The three-phase voltage u of measuring end M and measuring end N in window during 1ms after obtaining from fault moment
mk, u
nk, three-phase electricity flow valuve i
mk, i
nk(k=a, b, c), then tries to achieve the analog voltage u of circuit two ends reckoning to mid point according to the electric current and voltage regularity of distribution of Bei Jielong circuit model
mk, l/2, u
nk, l/2, analog current i
mk, l/2, i
nk, l/2;
Again according to analog voltage u
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2simulated power p is asked for by formula (1), (2)
m, l/2and p
n, l/2, as shown in Figure 3;
The simulated power p of gained will be calculated
m, l/2, p
n, l/20.15ms time window in sue for peace and carry out integration by formula (3), obtain integrated value δ=486.3361.Due to δ >240, meet formula (5), be therefore judged to protected circuit fault.
Embodiment 3:500kV transmission line of alternation current system as shown in Figure 1.Adopt Bei Jielong circuit model, if protected circuit is MN, line parameter circuit value is with embodiment 1.Now suppose to hold 80km that A phase earth fault occurs apart from N on circuit NQ, the initial phase angle of fault is 90 °, and transition resistance is 10 Ω.The three-phase voltage u of measuring end M and measuring end N in window during 1ms after obtaining from fault moment
mk, u
nk, three-phase electricity flow valuve i
mk, i
nk(k=a, b, c), then tries to achieve the analog voltage u of circuit two ends reckoning to mid point according to the electric current and voltage regularity of distribution of Bei Jielong circuit model
mk, l/2, u
nk, l/2, analog current i
mk, l/2, i
nk, l/2;
Again according to analog voltage u
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2simulated power p is asked for by formula (1), (2)
m, l/2and p
n, l/2, as shown in Figure 4;
The simulated power p of gained will be calculated
m, l/2, p
n, l/20.15ms time window in sue for peace and carry out integration by formula (3), obtain integrated value δ=486.3361.Due to δ >240, meet formula (5), be therefore judged to protected circuit fault.
By reference to the accompanying drawings the specific embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, various change can also be made under the prerequisite not departing from present inventive concept.
Claims (3)
1. one kind utilizes instantaneous power to carry out the electric transmission line longitudinal protection method of Simulation after test under Bei Jielong circuit model, it is characterized in that: the three-phase voltage that transmission line two ends are surveyed, current value presses analog voltage and the electric current of circuit Bei Jielong model computing electric power line mid point respectively, try to achieve two the simulation instantaneous powers of circuit two ends reckoning to mid point respectively, in short time-window, integration is carried out after they being sued for peace, if this integrated value is less than setting value, then be judged to protected circuit not break down, if this integrated value is more than or equal to setting value, then be judged to line fault, thus realize the pilot protection of transmission line.
2. the instantaneous power that utilizes under Bei Jielong circuit model according to claim 1 carries out the electric transmission line longitudinal protection method of Simulation after test, it is characterized in that concrete steps are:
After the first step, protected transmission line of alternation current MN break down, in short time window, obtain the three-phase voltage u of measuring end M and measuring end N
mk, u
nk, three-phase electricity flow valuve i
mk, i
nk(k=a, b, c), then tries to achieve the analog voltage u of circuit two ends reckoning to mid point according to the electric current and voltage regularity of distribution of Bei Jielong circuit model
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2;
Second step, according to analog voltage u
mk, l/2, u
nk, l/2with analog current i
mk, l/2, i
nk, l/2through type (1) and formula (2) ask for simulated power p
m, l/2and p
n, l/2;
3rd step, the simulated power p that will try to achieve
m, l/2, p
n, l/20.15ms time window in summation and carry out integration by following formula, obtain integrated value δ;
T in formula (3)
1for integration initial time, t
2for the integration end time, t
2=t
1+ 0.15;
4th step, the magnitude relationship between integrated value δ and setting value is utilized to judge protected circuit whether fault by formula (4), (5),
If δ is <k
1δ
set, then the non-fault of protected line (4)
If δ>=k
1δ
set, then protected line fault (5)
In formula (4), (5), δ
setfor under protected circuit non-failure conditions, calculate the short time-window integration maximum of gained power sum, k
1for safety factor.
3. a kind of instantaneous power that utilizes under Bei Jielong circuit model according to claim 1 and 2 carries out the electric transmission line longitudinal protection method of Simulation after test, it is characterized in that: the short time-window length chosen during calculating simulation power integral value is 0.15ms, safety factor k
1be taken as 1.2; PSCAD/EMTDC electromagnetic transient simulation software is utilized to carry out protected circuit failure condition traversal emulation completely, by δ
setadjust is 200.
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|---|---|---|---|
| CN201410468718.3A CN104505813B (en) | 2014-09-15 | 2014-09-15 | A kind of electric transmission line longitudinal protection method for carrying out Simulation after test using instantaneous power under Bei Jielong circuit models |
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|---|---|---|---|
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Cited By (5)
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| CN105277849A (en) * | 2015-09-29 | 2016-01-27 | 昆明理工大学 | Bus protection method based on line mode current S transformation argument detection |
| CN107038288A (en) * | 2017-03-23 | 2017-08-11 | 华北电力大学 | Power electronic equipment parallel equivalent expansion method and module based on Bei Jielong models |
| CN109085460A (en) * | 2018-07-10 | 2018-12-25 | 国网浙江省电力有限公司杭州供电公司 | The single-ended diagnostic method of extra high voltage direct current transmission line failure based on transient monitoring |
| CN110286296A (en) * | 2019-05-20 | 2019-09-27 | 昆明理工大学 | A kind of half-wave power transmission route transient longitudinal protection method based on Simulation after test principle |
| CN110568308A (en) * | 2019-07-19 | 2019-12-13 | 昆明理工大学 | Extra-high voltage direct current transmission line area internal and external fault identification method based on Bergeron line model |
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| CN103675536A (en) * | 2013-12-03 | 2014-03-26 | 昆明理工大学 | Lightning interference recognition method utilizing instantaneous power and linear fitting |
| CN104201656A (en) * | 2014-07-01 | 2014-12-10 | 昆明理工大学 | Pilot protection method for electric transmission line with controlled series compensator to use current transient quantity to perform simulation after test |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105277849A (en) * | 2015-09-29 | 2016-01-27 | 昆明理工大学 | Bus protection method based on line mode current S transformation argument detection |
| CN107038288A (en) * | 2017-03-23 | 2017-08-11 | 华北电力大学 | Power electronic equipment parallel equivalent expansion method and module based on Bei Jielong models |
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| CN110286296A (en) * | 2019-05-20 | 2019-09-27 | 昆明理工大学 | A kind of half-wave power transmission route transient longitudinal protection method based on Simulation after test principle |
| CN110568308A (en) * | 2019-07-19 | 2019-12-13 | 昆明理工大学 | Extra-high voltage direct current transmission line area internal and external fault identification method based on Bergeron line model |
| CN110568308B (en) * | 2019-07-19 | 2021-07-13 | 昆明理工大学 | Extra-high voltage direct current transmission line area internal and external fault identification method based on Bergeron line model |
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