CN101051738A - Negative sequence direction longitudinal protective method for very high voltage transmission line - Google Patents
Negative sequence direction longitudinal protective method for very high voltage transmission line Download PDFInfo
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- CN101051738A CN101051738A CN 200710056724 CN200710056724A CN101051738A CN 101051738 A CN101051738 A CN 101051738A CN 200710056724 CN200710056724 CN 200710056724 CN 200710056724 A CN200710056724 A CN 200710056724A CN 101051738 A CN101051738 A CN 101051738A
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Abstract
Adopting second order RC lowpass filter and half wave difference Fourier algorithm, the invention combines phase module transformation to filter out and obtain negative sequence voltage and current component. Then, using formula obtains action angle of negative sequence direction component. The method possesses enough capability to filter out high-frequency component and attenuate DC component. The negative sequence direction component can capture asymmetry at three-phase short-circuit moment in time and correctly so that the invention shows asymmetric fault, and three phase fault developed from asymmetry. The invention executes correct action within milliseconds at moment fault occurs.
Description
Technical field
The present invention relates to power system transmission line relaying protection field, relate in particular to a kind of UHV transmission line guard method.
Background technology
The electric pressure that improves circuit be improve conveying capacity reduce network loss improve system's operation stability important means.Extra-high voltage transmission line is the power transmission line of voltage more than 1000kV, and general distance is very long, and distributed capacitance is big, and is different with high voltage transmission line, and the task of extra-high voltage transmission line relaying protection at first is to guarantee not produce unallowable overvoltage, and can guarantee system stability.Be over-voltage, the two ends mute time is not more than 40-50ms (precise number will calculate by overvoltage) under any fault.
The two cover main protections of adopting on Muscovite 750kV circuit and the 1150kV circuit: the one, the negative sequence direction carrier current protection, another is apart from high frequency and zero sequence direction carrier current protection.Then switch to Phase Difference High Frequency Protection in cycle to react the fault under the non-full phase state at single-pole reclosing.The configuration of the U.S.'s 765 kilovolt relaying protections similarly.Above-mentioned the protection of operating experience is arranged all is analog, how to realize that with microcomputer negative-sequence direction component makes it can be used in extra-high voltage transmission line and then requires further study.
The operating experience that the negative sequence direction longitudinal protection has a long history and enriches.UHV transmission line is long; distributed capacitance is big; but the actuating range of direction component is big, be half plane, through a large amount of thinking, can not influence the correct operation of protection generally speaking: the major defect of negative-sequence direction component is to be considered to " can not react three-phase shortcircuit ".The negative sequence directional protection that Russia realizes in analog protection, the operating experience of decades shows, the tripping never when three-phase shortcircuit of the banked relay of this judgement three-phase shortcircuit direction.But,, have document whether this method is applicable to that Microcomputer Protection has proposed query because numeral filter preface is slow.At Su Bin; the paper that Dong Xinzhou etc. write " short window algorithm and the research of power frequency direction component fast " Tianjin power technology-2001 (2) .-9-16) and Li Bin (source:; Li Yongli; congratulate the paper that tame Lee writes " a kind of high accuracy quick filter algorithm that extracts fundametal compoment " (source: propose improved narrow band pass filter Automation of Electric Systems-2006.30 (10) .-39-43); and provide and guarantee that time-delay is zero initial value adding method; but after requiring fault in the quick protection of several milliseconds of actions; can't provide initial value accurately with method in the document, so the time-delay situation of filter is still waiting to analyze.
Summary of the invention
The present invention is directed to the above-mentioned deficiency of prior art; provide a kind of time-delay very short; high-frequency signal is had the method for negative sequence directional pilot protection of the quick Microcomputer Protection of ultra high voltage of enough filtering abilities, thereby make the application of quick negative sequence direction longitudinal protection on UHV transmission line become possibility.For this reason, the present invention adopts following technical scheme:
A kind of method for negative sequence directional pilot protection of UHV transmission line comprises the following steps:
(1) negative-sequence direction component is gathered the magnitude of voltage and the current value of the transmission line that breaks down in real time;
(2) by of magnitude of voltage, the current value filtering of Order RC digital filter to collecting;
(3) utilize half-wave difference Fu Shi algorithm to obtain voltage vector and current phasor (U to filtered data
﹠amp;, I
﹠amp;);
(4) obtain negative sequence voltage, electric current (U by phase-model transformation
2 ﹠amp;, I
2 ﹠amp;);
(5) obtain operating angle
(6) if operating angle
Between 0 ° and 180 °, then be judged as power transmission line positive direction fault, negative sequence direction
The element action; Otherwise the judgement power transmission line is a reverse direction failure, and negative-sequence direction component is failure to actuate.
The present invention selects for use transient performance obviously to be better than the Order RC low pass filter of narrow band pass filter, in conjunction with half-wave difference Fu Shi algorithm, can also have the ability of certain filtering high fdrequency component and attenuating dc component when guaranteeing that filter responds fast.Reliably motionless when utilizing the negative sequence directional protection reverse direction failure that this kind filtering method realizes; Inner various unbalanced faults and evolved fault, can both action message, can during several milliseconds of three-phase shortcircuit initial instantaneous asymmetric, correctly leach negative sequence component, thereby can capture three-phase shortcircuit moment unsymmetrical short-circuit, generally be decidable fault direction (various faults all can guarantee to determine in the 5ms direction after fault) in the 2-3ms after fault, it is very short to delay time.
Description of drawings
The schematic flow sheet that Fig. 1 carries out fault verification and relaying protection for guard method of the present invention.
Fig. 2 1000kv UHV transmission line system schematic.
Fig. 3 N side is phase to phase fault negative-sequence direction component operating characteristics in the other direction.
The inner two-phase of Fig. 4 is through 400 Ω transition resistance earth fault both sides negative-sequence direction component operating characteristicss.
Fig. 5 inside is by the three-phase fault both sides negative-sequence direction component operating characteristics that does not claim to grow up.
Embodiment
Below in conjunction with drawings and Examples the present invention is further described.
Negative sequence component is present in the overall process of unbalanced fault, and therefore, the negative sequence direction longitudinal protection can be reacted the overall process of unbalanced fault reliably; Do not react the load current of circuit; The influence of not vibrated; Be not subjected to the influence of parallel lines zero-sequence mutual inductance; Because of only comparing the phase place of negative sequence voltage, electric current, so be not subjected to the influence of transition resistance in theory; Can react the three-phase fault that grows up by asymmetric.The core parts of negative sequence direction longitudinal protection are negative-sequence direction components.Among the present invention, the operating criterion that negative phase-sequence direction element adopts is:
The operating criterion of negative phase-sequence inverse direction element is:
Narrow band pass filter and Order RC low pass filter commonly used in the relaying protection are unlimited responding digital filter; the response time of this filter is not only relevant with current and interior for the previous period input; also relevant with former output; filtering is a kind of recursion computational process, so the calculating of time delay will come to determine as the case may be.The claimed quick acting in several milliseconds of high speed protective relaying device, so the time delay of filter will be lacked as far as possible, the response time of filter is an important indicator of selective filter.Order RC low pass filter and narrow band pass filter all are recurrence, and the transient state time delay is uncertain, the relevant influence that also is subjected to initial value simultaneously of time delay with the filter self character, and all composing initial value in the present embodiment is sampled value.From the response time of Fig. 3 filter, the response time of visible Order RC low pass filter is faster than narrow band pass filter.Find that in analysis Order RC low pass filter transient performance obviously is better than narrow band pass filter, the Order RC low pass filter is more suitable for being used for quick protection.
Select the Order RC low pass filter in conjunction with half-wave difference Fu Shi algorithm, the ability of certain filtering high fdrequency component and attenuating dc component is arranged.Reliably motionless during the negative sequence directional protection reverse direction failure realized with the method; Inner various unbalanced faults and evolved fault, can both action message, can during several milliseconds of three-phase shortcircuit initial instantaneous asymmetric, correctly leach negative sequence component, thereby can capture three-phase shortcircuit moment unsymmetrical short-circuit, generally after fault decidable fault direction (various faults all can guarantee to determine in the 5ms direction after fault).For as drop the stable three-phase shortcircuit that does not excise in the three-phase earth connection, available hand closes signal enabling one cell impedance element and is excised.The phase spacing that should be noted that superhigh pressure and extra high voltage line is all more than 15 meters, and three-phase shortcircuit fully simultaneously is unlikely.The fault that this occurrence probability is few is given quick reserve and should be thought correct apart from going to handle to simplify main protection.
Referring to Fig. 1, when extra-high voltage transmission line broke down, negative-sequence direction component adopted following method for negative sequence directional pilot protection:
(1) negative-sequence direction component is gathered the magnitude of voltage and the current value of the transmission line that breaks down in real time;
(2) by of magnitude of voltage, the current value filtering of Order RC digital filter to collecting;
(3) utilize half-wave difference Fu Shi algorithm to obtain voltage vector and current phasor (U to filtered data
﹠amp;, I
﹠amp;);
(4) obtain negative sequence voltage, electric current (U by phase-model transformation
2 ﹠amp;, I
2 ﹠amp;);
(5) obtain operating angle
(6) if operating angle
Between 0 ° and 180 °, then be judged as power transmission line positive direction fault, negative sequence direction
The element action; Otherwise the judgement power transmission line is a reverse direction failure, and negative-sequence direction component is failure to actuate.
System model as shown in Figure 2, electric pressure is 1000kV, protected circuit total length 500km.During normal the operation, two side system angles, 65 degree, transmission current 4330A.K
1Be troubles inside the sample space, K
2Be external area error.The circuit parameter of power transmission line is as follows:
r
1＝0.00805Ω/km L
1＝0.82525e-3H/km C
1＝14.03699e-9F/km
r
0＝0.20489Ω/km L
0＝2.37599e-3H/km C
0＝9.03439e-9F/km
For absorb capacitive reactive power, overvoltage when preventing that overvoltage from should install the operational mode of very big parallel reactance of capacity or adjustable reactive-load compensation equipment shunt reactor and should consider failure removal.Shunt reactor parameter: L=2.89019H, compensativity is 50%.
In an embodiment of the present invention; 40 points of sampling weekly; adopt digital Order RC low pass filter that sampled data is carried out filtering earlier; and then ask the electric current and voltage vector by half-wave difference Fu Shi algorithm; there is the window problem of striding though begin the Fu Shi algorithm in fault; utilized the preceding data of partial fault, but this does not influence the correct operation of protection.
Fault type has been considered the asymmetric and expansionary three-phase fault of the various faults of positive and negative direction, and the asymmetrical state of three-phase shortcircuit moment is 5ms; There are outlet in the other direction, positive direction outlet and line end in the fault point that is provided with.All can be to protection under the above various situations at 5ms with interior fast quick-action, the delay protection through 2ms exports then.
Fig. 3 is K
2The operating characteristics of the outside double earthfault protection of point is judged to reverse direction failure by the visible N side protection of criterion formula (2), and opposite direction element action message also sends the protection of block signal locking M side, and protection reliably is failure to actuate; Fig. 4 is that inner two-phase is through 400 Ω transition resistance earth faults, after fault takes place as seen from the figure, 2.5ms after the fault (shown in vertical line among the figure) constantly after two ends protection operating angle all drop between 0 °-180 ° internal fault active region, protection is judged to troubles inside the sample space; Fig. 5 is at K
1Point is that 5ms transfers three-phase fault to after the BC double earthfault by the three-phase fault that does not claim to grow up, 2.5ms constantly after, two ends protection operating angle all drops between 0 °-180 ° internal fault active region, through the 2ms time-delay, exports at 4.5ms.
Claims (1)
1. the method for negative sequence directional pilot protection of a UHV transmission line when being used for UHV transmission line and breaking down, comprises the following steps:
(1) negative-sequence direction component is gathered the magnitude of voltage and the current value of transmission line in real time;
(2) by of magnitude of voltage, the current value filtering of Order RC digital filter to collecting;
(3) utilize half-wave difference Fu Shi algorithm to obtain voltage vector and current phasor to filtered data
(4) obtain negative sequence voltage, electric current by phase-model transformation
(5) obtain operating angle
(6) if operating angle
Between 0 ° and 180 °, then be judged as power transmission line positive direction fault, the negative-sequence direction component action; Otherwise the judgement power transmission line is a reverse direction failure, and negative-sequence direction component is failure to actuate.
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| CN 200710056724 CN101051738A (en) | 2007-02-06 | 2007-02-06 | Negative sequence direction longitudinal protective method for very high voltage transmission line |
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|---|---|---|---|
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562331B (en) * | 2009-05-21 | 2012-04-18 | 烟台东方电子信息产业股份有限公司 | Negative sequence reactance direction judging method |
| CN102522732A (en) * | 2011-12-06 | 2012-06-27 | 国电南瑞科技股份有限公司 | Direct-current protection system with multiple paths of optical fiber interfaces and direct-current protection method |
| CN106026041A (en) * | 2016-05-26 | 2016-10-12 | 天津大学 | Pilot protection method for flexible DC interconnection device outlet line |
| CN109581085A (en) * | 2018-12-05 | 2019-04-05 | 广东电网有限责任公司 | A kind of collection electric wire and fault of interconnected transmission line discriminating direction method |
| CN109884476A (en) * | 2019-04-18 | 2019-06-14 | 广东电网有限责任公司 | A kind of fault of interconnected transmission line discriminating direction method suitable for double-fed plant-grid connection |
| CN110247381A (en) * | 2019-07-11 | 2019-09-17 | 西南交通大学 | A kind of electric transmission line longitudinal protection method based on Kendall Tau coefficient |
| CN111929535A (en) * | 2020-08-13 | 2020-11-13 | 广东电网有限责任公司电力调度控制中心 | Method and device for detecting fault direction of direct-current side outlet of alternating-current circuit |
| CN117911011A (en) * | 2024-03-19 | 2024-04-19 | 天津大学 | AC/DC series-parallel power line fault maintenance early warning method |
-
2007
- 2007-02-06 CN CN 200710056724 patent/CN101051738A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562331B (en) * | 2009-05-21 | 2012-04-18 | 烟台东方电子信息产业股份有限公司 | Negative sequence reactance direction judging method |
| CN102522732A (en) * | 2011-12-06 | 2012-06-27 | 国电南瑞科技股份有限公司 | Direct-current protection system with multiple paths of optical fiber interfaces and direct-current protection method |
| CN102522732B (en) * | 2011-12-06 | 2015-01-14 | 国电南瑞科技股份有限公司 | Direct-current protection system with multiple paths of optical fiber interfaces and direct-current protection method |
| CN106026041A (en) * | 2016-05-26 | 2016-10-12 | 天津大学 | Pilot protection method for flexible DC interconnection device outlet line |
| CN106026041B (en) * | 2016-05-26 | 2018-05-08 | 天津大学 | Longitudinal protection method for flexible direct current interconnect device egress line |
| CN109581085A (en) * | 2018-12-05 | 2019-04-05 | 广东电网有限责任公司 | A kind of collection electric wire and fault of interconnected transmission line discriminating direction method |
| CN109884476A (en) * | 2019-04-18 | 2019-06-14 | 广东电网有限责任公司 | A kind of fault of interconnected transmission line discriminating direction method suitable for double-fed plant-grid connection |
| CN110247381A (en) * | 2019-07-11 | 2019-09-17 | 西南交通大学 | A kind of electric transmission line longitudinal protection method based on Kendall Tau coefficient |
| CN111929535A (en) * | 2020-08-13 | 2020-11-13 | 广东电网有限责任公司电力调度控制中心 | Method and device for detecting fault direction of direct-current side outlet of alternating-current circuit |
| CN111929535B (en) * | 2020-08-13 | 2023-04-18 | 广东电网有限责任公司电力调度控制中心 | Method and device for detecting fault direction of direct-current side outlet of alternating-current circuit |
| CN117911011A (en) * | 2024-03-19 | 2024-04-19 | 天津大学 | AC/DC series-parallel power line fault maintenance early warning method |
| CN117911011B (en) * | 2024-03-19 | 2024-05-28 | 天津大学 | AC/DC series-parallel power line fault maintenance early warning method |
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