CN101661074A - Judging method for transient and permanent faults of transmission line with parallel reactance - Google Patents
Judging method for transient and permanent faults of transmission line with parallel reactance Download PDFInfo
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- CN101661074A CN101661074A CN200910034670A CN200910034670A CN101661074A CN 101661074 A CN101661074 A CN 101661074A CN 200910034670 A CN200910034670 A CN 200910034670A CN 200910034670 A CN200910034670 A CN 200910034670A CN 101661074 A CN101661074 A CN 101661074A
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Abstract
The invention relates to a judging method for transient and permanent faults of a transmission line with parallel reactance. The method comprises the following steps: 1) calculation of difference voltage, conducting difference calculation on sampling values of jumping-phase recovery voltage by taking 20ms or integral multiple thereof as intervals; 2) cumulative mean of difference voltage, carryingout cumulative mean of at least two cycles on the differentiated voltage; 3) judgment of fault types: if the difference voltage of cumulative mean is higher than a voltage threshold, the fault is a transient fault; if not, the fault is a permanent fault. The judging method can effectively identify transient and permanent faults, is free from the effect of line length, and is suitable for variousconditions of one end with parallel reactance, both ends respectively with parallel reactance, and line middle part with parallel reactance.
Description
Technical field
The present invention relates to a kind of judging method for transient and permanent faults of transmission line, belong to the power system automation technology field with parallel reactance.
Background technology
The transmission line of electricity of voltage levels all adopts automatic coincidence arrangement in order to improve power supply reliability, if coinciding with permanent fault will cause very big impact to system, has a strong impact on the reliability of power supply and the security of consumer.If can before combined floodgate, determine nature of trouble (transient fault or permanent fault), just can avoid closing in permanent fault according to fault character realization reclosing.
Domestic as far back as last century the eighties begin just to have scholar expert's differentiation of nature of trouble that begins one's study, main method is divided three classes.(1) there are capacitor coupling voltage in voltage criterion, this method when mainly utilizing fault mutually transient fault to take place, and then do not have this voltage during permanent fault, and the characteristic that two kinds of situation voltage magnitudes differ greatly is distinguished.Its subject matter is that sensitivity is low, and anti-transition resistance ability is relatively poor, practical circuit limited length system, and be subjected to the influence of the method for operation.(2) based on the method that disconnects phase harmonic signal analysis and distinguishing transient fault and permanent fault, this method has been utilized the mathematical model of electric arc, implements the comparison difficulty.(3) artificial neural network (ANN) technology is differentiated transient fault and permanent fault computational accuracy height with the ANN technology, but because the neural network training calculated amount is big, realizes complexity, is difficult to satisfy the protection rapidity requirement.A kind of single-phase adaptive reclosing technology with the shunt reactor transmission line of electricity that has been 200810017574.4 disclosure of the Invention as application number discloses a kind of permanent failure judgement method for power transmission line with shunt reactor.This method has adopted the parameter recognition principle, on the network equation basis of setting up after transient fault disappears, structure is to wait to ask the identification equations of parameter with circuit shunt reactor and the little reactor inductance parameter of neutral point, utilize this side to perfect phase voltage, perfect phase current, shunt reactor electric current and the little reactor current of neutral point realize finding the solution of inductance parameters, find the solution inductance parameters according to the least-squares parameter estimation redundant arithmetic, the transient fault of relatively distinguishing circuit and the permanent fault of inductance parameters that utilization is found the solution and true inductance parameters.
Summary of the invention
Technical matters to be solved by this invention provides a kind of judging method for transient and permanent faults of transmission line of brand-new band parallel reactance, can accurately discern transient fault and permanent fault, provide strong foundation to reclosing, can make system avoid coinciding with permanent fault, guarantee the security of system reliability service.
For addressing the above problem, the present invention is achieved by the following technical solutions:
A kind of judging method for transient and permanent faults of transmission line with parallel reactance may further comprise the steps:
1) differential voltage is calculated: the recovery voltage sampled value of tripping phase is carried out 20ms or its integral multiple is Difference Calculation at interval;
2) differential voltage accumulative total is average: the accumulative total that the voltage through difference is taken to few two cycles is average;
3) nature of trouble is differentiated: if the average differential voltage of accumulative total is higher than the voltage threshold, then is judged to be transient fault, otherwise is permanent fault.
Principle of the present invention is: the beat frequency characteristic according to the ultra-high-tension power transmission line generation transient fault recovery voltage of being with and resisting proposes.Transmission line of electricity generation transient fault disconnection phase voltage at band shunt compensation reactor can produce beat frequency phenomenon, and in general the frequency of beat frequency all is lower than power frequency.Take place after the permanent fault, disconnecting phase terminal voltage only has electromagnetic coupled voltage, is determined by position of failure point.Electromagnetic coupled voltage is power frequency component, and the beat frequency voltage of the relative transient fault of amplitude is much smaller.Propose to utilize recovery voltage to clap in view of the above and piece together characteristic, recovery voltage is got the difference of 20ms (the perhaps integral multiple of 20ms) time for the interval, amplitude size according to differential voltage is differentiated nature of trouble, the differentiated voltage magnitude of transient fault is still than higher, and permanent fault voltage after difference is close to zero.The validity and the applicability of this method have been verified through off-line simulation and dynamic model experiment.
The beneficial effect that the present invention reached is: the judging method for transient and permanent faults of transmission line of band parallel reactance of the present invention can effectively be discerned instantaneous and permanent fault, and this method is not subjected to the influence of line length, be applicable to that an end has and anti-, two ends all have and anti-and circuit in the middle of have and anti-various situations.
Embodiment
Below specific implementation step of the present invention is described further.
Begin to calculate the difference mean value U of tripping phase recovery voltage after the tripping of fault phase, fault phase recovery voltage is that sampled value is u (m) behind the assumed fault.
(1) differential voltage asks for
u
cf(m)＝u(m)-u(m-k·sampl) (1)
Wherein: sampl is ripple sampling number weekly; K=1,2,3 ...
(2) differential voltage accumulative total is average
(3) differentiation of instantaneous permanent fault
If satisfy U (m)＞U
MkThen be judged to be transient fault, otherwise be permanent fault.U wherein
MkBe threshold voltage, can be set to all is suitable between 1V～2V.
Below announced the present invention with preferred embodiment, so it is not in order to restriction the present invention, and all technical schemes that scheme obtained of taking to be equal to replacement or equivalent transformation all drop on protection scope of the present invention.
Claims (3)
1. the judging method for transient and permanent faults of transmission line with parallel reactance is characterized in that, may further comprise the steps:
1) differential voltage is calculated: the recovery voltage sampled value of tripping phase is carried out 20ms or its integral multiple is Difference Calculation at interval;
2) differential voltage accumulative total is average: the accumulative total that the voltage through difference is taken to few two cycles is average;
3) nature of trouble is differentiated: if the average differential voltage of accumulative total is higher than the voltage threshold, then is judged to be transient fault, otherwise is permanent fault.
2. the judging method for transient and permanent faults of transmission line of band parallel reactance according to claim 1 is characterized in that: in described step 1), utilize formula (1) to ask for differential voltage,
u
cf(m)＝u(m)-u(m-k·sampl) (1)
Wherein: sampl is ripple sampling number weekly; K=1,2,3 ...
3. the judging method for transient and permanent faults of transmission line of band parallel reactance according to claim 1 and 2 is characterized in that: in described step 3), described voltage threshold is between 1V～2V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910034670A CN101661074A (en) | 2009-08-31 | 2009-08-31 | Judging method for transient and permanent faults of transmission line with parallel reactance |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910034670A CN101661074A (en) | 2009-08-31 | 2009-08-31 | Judging method for transient and permanent faults of transmission line with parallel reactance |
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| CN101661074A true CN101661074A (en) | 2010-03-03 |
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| CN200910034670A Pending CN101661074A (en) | 2009-08-31 | 2009-08-31 | Judging method for transient and permanent faults of transmission line with parallel reactance |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116116A (en) * | 2013-02-25 | 2013-05-22 | 浙江省电力公司电力科学研究院 | Judging method and device of over line stoppage property of same pole double-circuit line with paralleling reactor |
| 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 |
| CN103777114A (en) * | 2014-01-26 | 2014-05-07 | 浙江大学 | Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor |
| CN103809078A (en) * | 2014-01-26 | 2014-05-21 | 浙江大学 | Single-phase permanent fault identification method for electric transmission line with paralleling reactors at two ends of electric transmission line |
| CN103983899A (en) * | 2014-05-22 | 2014-08-13 | 国家电网公司 | Power distribution network permanent fault identification method based on injected signal |
| CN104502744A (en) * | 2014-11-26 | 2015-04-08 | 国家电网公司 | Method for discriminating property of single-phase fault of power transmission line with parallel electric reactor |
| CN104280645B (en) * | 2014-10-28 | 2017-01-04 | 国家电网公司 | Single-phase fault property diagnosis method for power transmission line with shunt reactor |
| CN107907790A (en) * | 2017-10-18 | 2018-04-13 | 中国电力科学研究院 | A kind of aerial DC line transient fault recognition methods and system |
| CN109991498A (en) * | 2013-05-24 | 2019-07-09 | 泰达电子股份有限公司 | Arc-detection |
| CN113741387A (en) * | 2021-08-16 | 2021-12-03 | 北京工业大学 | Threshold value judgment method for instantaneous fault occurrence intensity |
| CN117239670A (en) * | 2023-11-14 | 2023-12-15 | 昆明理工大学 | Single-phase self-adaptive reclosing method and system for wind power alternating current outgoing line |
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2009
- 2009-08-31 CN CN200910034670A patent/CN101661074A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116116A (en) * | 2013-02-25 | 2013-05-22 | 浙江省电力公司电力科学研究院 | Judging method and device of over line stoppage property of same pole double-circuit line with paralleling reactor |
| 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 |
| CN103219712B (en) * | 2013-03-12 | 2015-10-28 | 西安工程大学 | Based on the power transmission line one-phase malfunction property identification method of natural frequency |
| CN109991498A (en) * | 2013-05-24 | 2019-07-09 | 泰达电子股份有限公司 | Arc-detection |
| CN103777114A (en) * | 2014-01-26 | 2014-05-07 | 浙江大学 | Method for recognizing single-phase permanent fault of single-ended electric transmission line with paralleling reactor |
| CN103809078A (en) * | 2014-01-26 | 2014-05-21 | 浙江大学 | Single-phase permanent fault identification method for electric transmission line with paralleling reactors at two ends of electric transmission line |
| CN103777114B (en) * | 2014-01-26 | 2016-11-23 | 浙江大学 | A kind of single-ended band shunt reactor transmission line of electricity single-phase permanent fault recognition methods |
| CN103809078B (en) * | 2014-01-26 | 2016-04-20 | 浙江大学 | The single-phase permanent fault recognition methods of a kind of both-end band shunt reactor transmission line of electricity |
| CN103983899B (en) * | 2014-05-22 | 2016-08-31 | 国家电网公司 | Power distribution network permanent fault discrimination method based on Injection Signal |
| CN103983899A (en) * | 2014-05-22 | 2014-08-13 | 国家电网公司 | Power distribution network permanent fault identification method based on injected signal |
| CN104280645B (en) * | 2014-10-28 | 2017-01-04 | 国家电网公司 | Single-phase fault property diagnosis method for power transmission line with shunt reactor |
| CN104502744A (en) * | 2014-11-26 | 2015-04-08 | 国家电网公司 | Method for discriminating property of single-phase fault of power transmission line with parallel electric reactor |
| CN104502744B (en) * | 2014-11-26 | 2017-06-20 | 国家电网公司 | A kind of transmission line of electricity single-phase fault property method of discrimination with shunt reactor |
| CN107907790A (en) * | 2017-10-18 | 2018-04-13 | 中国电力科学研究院 | A kind of aerial DC line transient fault recognition methods and system |
| CN113741387A (en) * | 2021-08-16 | 2021-12-03 | 北京工业大学 | Threshold value judgment method for instantaneous fault occurrence intensity |
| CN113741387B (en) * | 2021-08-16 | 2024-06-18 | 北京工业大学 | Threshold judgment method for occurrence intensity of instantaneous fault |
| CN117239670A (en) * | 2023-11-14 | 2023-12-15 | 昆明理工大学 | Single-phase self-adaptive reclosing method and system for wind power alternating current outgoing line |
| CN117239670B (en) * | 2023-11-14 | 2024-01-26 | 昆明理工大学 | Single-phase self-adaptive reclosing method and system for wind power alternating current outgoing line |
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Application publication date: 20100303 |