CN103219712B - Based on the power transmission line one-phase malfunction property identification method of natural frequency - Google Patents
Based on the power transmission line one-phase malfunction property identification method of natural frequency Download PDFInfo
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- CN103219712B CN103219712B CN201310077283.5A CN201310077283A CN103219712B CN 103219712 B CN103219712 B CN 103219712B CN 201310077283 A CN201310077283 A CN 201310077283A CN 103219712 B CN103219712 B CN 103219712B
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Abstract
The invention discloses the power transmission line one-phase malfunction property identification method based on natural frequency, specifically implement according to following steps: 1) after the tripping operation of transmission line single-phase fault, gather faulted phase current i (t), after the signal condition steps such as high-pass filtering, carry out Prony analysis again, in Prony analysis result, extract the natural frequency dominant frequency f of transient state component
1(k); 2) the dominant frequency frequency f will obtained in step 1)
1(k) and electric power system power frequency f
0k () compares, construct rational criterion then according to criterion, i.e. f
1(k) & gt; K
ref
0(k); 3) according to step 2) criterion that constructs carries out transmission line single-phase fault property identification.Fault-free recognition methods of the present invention not only solves the problem that the recognition methods of existing transmission line single-phase fault is subject to the impact of Arc Modelling, fault moment, line length, load current, transition resistance and compensativity factor, and the reclosing also solving existing definite-time exists sensitivity and the reliability that the problem coinciding with non-blow-out transient fault further increases transmission line single-phase fault identical criterion.
Description
Technical field
The invention belongs to power system transmission line technical field of relay protection, relate to a kind of transmission line single-phase intelligent reclosing property judgment method, be specifically related to a kind of power transmission line one-phase malfunction property identification method based on natural frequency.
Background technology
As everyone knows, reclosing technology is a kind of effective measures improving transmission line power supply reliability that domestic and international electric power system extensively adopts, but the reclosing technology in existing fixing coincidence time limit exists the danger of the second short circuit impact blindly coinciding with non-blow-out fault and permanent fault initiation.In view of the requirement of intelligent grid height power supply reliability, improve the fault self-recovery ability of transmission line and there is important construction value, wherein particularly important to the research of the Intelligent reclosing with nature of trouble recognition function and self adaptation reclosing time.
At present, the property judgment method of existing Intelligent reclosing can be divided into based on fault electric arc stage electric parameters and recovery voltage stage electric parameters feature two class.Arcing phase method mainly utilizes the high order harmonic component feature of arc voltage to realize the identification of transient fault and permanent fault, but be difficult to set up accurate Arc Modelling and the low problem of Weak absorption precision owing to existing, make to utilize the criterion of arcing phase electric parameters feature to be restricted, and be determined as instantaneity fault electric arc before coincidence whether extinguish and still there is uncertain factor.The method of discrimination in recovery voltage stage utilizes terminal voltage amount and utilizes the magnitude of current two class.Utilize the Fault Identification of voltage mainly according to the disconnection amplitude phase property of phase voltage and the composition of harmonic wave; The Fault Identification of the magnitude of current is utilized to mainly contain criterions such as disconnecting the amplitude of phase current, shunt reactor electric current and small reactor electric current, frequency and beat frequency.And be with and the long distance spy/superhigh pressure long distance transmission line mending reactor in order to reduce single phase ground fault arc current, introduce small reactor on neutral point device to realize compensating the approximate complete of capacitive coupling couple current, utilize current in the fault point feature to realize property judgment to have difficulties, and high compensativity shunt reactor has slackened the coupling perfecting phase greatly, cause the low frequency self-vibration component frequencies after transient fault blow-out very close to power frequency component simultaneously, make to utilize the method for discrimination of beat frequency feature to be difficult to effective application.
Summary of the invention
The object of the present invention is to provide a kind of power transmission line one-phase malfunction property identification method based on natural frequency, further increase sensitivity and the reliability of transmission line single-phase fault identical criterion.
The technical solution adopted in the present invention is, based on the power transmission line one-phase malfunction property identification method of natural frequency, specifically implements according to following steps:
Step 1, after the tripping operation of transmission line single-phase fault, gathers faulted phase current i (t), first after signal condition, carries out PRONY analysis again to faulted phase current i (t), obtain faulted phase current i (t) dominant frequency frequency f
1(k);
Step 2, by the dominant frequency frequency f obtained in step 1
1(k) and electric power system power frequency f
0k () compares, construct rational criterion;
Step 3, carries out transmission line single-phase fault property identification according to the criterion that step 2 constructs.
Feature of the present invention is also,
Step 1 is specifically implemented according to following steps:
Step 1.1, gathers faulted phase current i (t) after the tripping operation of transmission line single-phase fault;
Step 1.2, carries out the signal transacting such as high-pass filtering to faulted phase current i (t) collected in step 1.1;
Step 1.3, carries out PRONY analysis to faulted phase current i (t) after step 1.2 processes, extracts the natural frequency dominant frequency frequency f containing transient state component in faulted phase current i (t) in PRONY analysis result
1(k).
The criterion built in step 2 is:
f
1(k)>K
re·f
0(k)；
State in criterion, K
refor safety factor, K
re>1.
Step 3 is specifically implemented according to following steps:
If after circuit breaker disconnects, if meet the criterion requirement in step 2, reliably can be judged to transmission line single-phase fault character is transient fault;
Otherwise being then judged to transmission line single-phase fault character is permanent fault.
Beneficial effect of the present invention is,
(1) power transmission line one-phase malfunction property identification method based on natural frequency of the present invention is when transmission line breaks down, fault produce row ripple will between fault point and circuit two ends roundtrip, both sides, fault point all can realize separately the identification to nature of trouble; For important transmission line, circuit two ends can differentiate simultaneously, the effect confirmed again after playing judgement, effectively can guarantee the reliability of nature of trouble identical criterion.
(2) there is power frequency and natural frequency composition in the transient state component of the power transmission line one-phase malfunction property identification method based on natural frequency of the present invention after fault occurs, natural frequency is higher than power frequency, and in all natural frequencys dominant frequency and power frequency (50Hz) closest, signal amplitude is comparatively large and life period is longer, is easy to extract; If after circuit breaker disconnects, natural frequency principal frequency component does not exist or life period is less cannot extract then transmission line generation permanent fault and blow-out.
(3) of the present invention based on the intrinsic relating to parameters of transmission line such as the intrinsic main frequency of transmission line malfunction generation and the impedance of position of failure point and circuit two end system in the power transmission line one-phase malfunction property identification method of natural frequency, not by the impact of the factors such as system running state, Arc Modelling, fault moment, line length, load current, transition resistance and compensativity.
(4) power transmission line one-phase malfunction property identification method based on natural frequency of the present invention has good applicability, for existing band shunt reactor and the transmission line not with shunt reactor all applicable.
Accompanying drawing explanation
Fig. 1 is the structure chart of the transmission line Microcomputer-based Protection Hardware of the two end band shunt reactors based on adopting in the power transmission line one-phase malfunction property identification method of natural frequency of the present invention;
Fig. 2 is the sequential chart that transmission line breaks down.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
After ultra-high-tension power transmission line breaks down, the cyclical component in high fdrequency component is that after breaking down, row ripple is propagated on transmission line, and between fault point and source impedance roundtrip formed.Frequency domain shows as the harmonic wave form of a characteristic frequency (i.e. natural frequency dominant frequency).Formed the oscillation circuit of natural frequency by line inductance and line mutual-ground capacitor, due to the characteristics of distributed parameters of transmission line, natural frequency should have infinite multiple.Along with the increase of natural frequency, decay is more and more serious, and natural frequency component amplitude is more and more less, and when only having the dominant frequency amplitude maximum of natural frequency, frequency and power frequency are the most close.
In the inventive method, the transmission line of two end band shunt reactors is studied; as shown in Figure 1; transmission line M, N are equipped with both sides the protective device using discriminating element of the present invention; input variable is the transmission line magnitude of current; electric current is obtained by transmission line both sides current transformer TA1, TA2; be hardware structure diagram of the present invention in dotted line frame in Fig. 1; this hardware includes data acquisition system, microcomputer main system and exports output system, and the distinguished number in the inventive method to realize in microcomputer DSP main system by programming.For M side, transmission line electric current keeps through high-pass filtering, sampling and after A/D conversion, delivers to microcomputer main system, calculate natural frequency by corresponding algorithm after current transformer TA1 obtains; Then judge that the single-phase fault that circuit occurs is transient fault or permanent fault according to calculation on Natural Frequency result.In like manner, the protective device for both-end band shunt reactor circuit N side also can judge circuit single-phase fault character according to aforementioned thinking.One end band shunt reactor circuit is differentiated that result can be sent to opposite end by passage, whether determines two ends reclosing action by the differentiation result of distinguished number and criterion.
The principle of the power transmission line one-phase malfunction property identification method based on natural frequency of the present invention utilizes the frequency characteristic of faulted phase current amount to build nature of trouble identical criterion, current component specifically in faulty line is successively after record ripple, filtering, utilize its frequency of Prony Algorithm Analysis, extract natural frequency dominant frequency component, set up nature of trouble identical criterion by the size comparing dominant frequency and power frequency and carry out nature of trouble identification.
Power transmission line one-phase malfunction property identification method based on natural frequency of the present invention, specifically implement according to following steps:
Step 1, after the tripping operation of transmission line single-phase fault, gathers faulted phase current i (t), first after signal condition, carries out Prony analysis again to faulted phase current i (t), obtain faulted phase current i (t) dominant frequency frequency f
1(k):
Step 1.1, gathers faulted phase current i (t) after the tripping operation of transmission line single-phase fault;
Step 1.2, carries out the signal transacting such as high-pass filtering to faulted phase current i (t) collected in step 1.1, filtering noise and frequency are lower than each frequency signal of 50Hz;
Step 1.3, carries out Prony analysis to faulted phase current i (t) after step 1.2 processes, extracts the natural frequency dominant frequency frequency f of the transient state component contained in faulted phase current i (t) in Prony analysis result
1(k); This is because each transient state component medium frequency that faulted phase current i (t) contains to get over amplitude little, decay more serious, only have natural frequency principal frequency component amplitude the highest, it is the most convenient to extract, and dominant frequency frequency f
1(k) and power frequency f
0k () is the most close;
Step 2, by the dominant frequency frequency f obtained in step 1
1(k) and electric power system power frequency f
0k () compares, construct rational criterion:
After the tripping operation of transmission line single-phase fault, in faulted phase current i (t) component, there is natural frequency high frequency transient component, and dominant frequency frequency f in natural frequency
1k () can be greater than electric power system power frequency f
0(k);
After circuit breaker disconnects, transient fault (the non-blow-out of fault) also can exist natural frequency high fdrequency component;
Permanent fault is reliably discharged over the ground, and faulted phase current i (t) component does not exist high fdrequency component and only there is power frequency component f
0(k);
Specifically judge according to following criterion:
f
1(k)>K
re·f
0(k)；
In above-mentioned criterion, K
refor safety factor, K
re>1;
Step 3, carry out transmission line single-phase fault property identification according to the criterion that step 2 constructs:
After circuit breaker disconnects, if meet the criterion requirement in step 2, reliably can be judged to transmission line single-phase fault character is transient fault, the moment producing transient fault blow-out sends the order that overlaps, effectively can shorten interruption duration like this, the moment of transient fault blow-out effectively improves the efficiency of reclosing really surely;
Otherwise, then to be judged to transmission line single-phase fault character be permanent fault or be referred to as transient fault blow-out, continue to differentiate before the maximum permission open-phase operation time arrives, in addition permanent fault is reliably discharged over the ground, arc extinction is relatively very fast, after circuit breaker disconnects, fault phase is not containing high frequency proper component.
Fig. 2 illustrates transmission line malfunction sequential, as seen from Figure 2: t
1moment transmission line breaks down, t
2moment circuit breaker disconnects, t
3moment fault blow-out, t
4it is Reclosing Instant.After transmission line malfunction occurs, i.e. t>t
1time, to the dominant frequency f of fault phase transient state current component natural frequency
1k () carries out continuing to calculate, when having judged, after reclosing device action, stop calculating.Work as t
1<t<t
2time, transient fault and permanent fault all contain transient high-frequency component; Because permanent fault is reliably discharged over the ground, in fault phase transient state component, the natural frequency principal frequency component duration is not long.Work as t>t
2time, can according to criterion failure judgement character, if intrinsic high frequency principal frequency component or principal frequency component cannot be extracted when not existing, directly permanent fault can be judged to.Transient fault is judged to, self-adapting automatic recloser action, breaker closing when above-mentioned criterion meets operation condition.Otherwise, then permanent fault is judged to, self-adapting automatic recloser locking.
Method of the present invention is on transmission line internal fault basis, according to the electromagnetic wave natural frequency that fault produces, analyze natural frequency feature and propose a kind of transmission line malfunction property identification method based on natural frequency feature, wherein natural frequency only relating to parameters intrinsic with transmission line, in this approach by the impact of system other factors outer, with the existing criterion of power transmission line electrical measure feature that utilizes with the use of effectively improving reliability.Method of the present invention not only can as the effective ways of UHV Long Transmission Line Intelligent reclosing nature of trouble identification; Also can be used as existing effectively supplementing based on fault phase electric parameters characteristic criterion.On Microcomputer Protection and the increasingly mature basis of signal processing technology, the method has a good application prospect.
Transmission line malfunction property identification method based on natural frequency feature of the present invention is the major frequency components producing a series of transient high frequency (i.e. natural frequency) component propagated to transmission line both sides based on fault point, after circuit breaker disconnects, according to natural frequency dominant frequency frequency f
1k () identifies nature of trouble with comparing of power frequency size, natural frequency has only relevant with transmission line parameter feature, avoid based on fault phase electric parameters feature identical criterion fault phase electric parameters and many factors about and higher shortcoming is required to certainty of measurement.
Claims (3)
1. based on the power transmission line one-phase malfunction property identification method of natural frequency, it is characterized in that, specifically implement according to following steps:
Step 1, after the tripping operation of transmission line single-phase fault, gathers faulted phase current i (t), first after signal condition, carries out PRONY analysis again to faulted phase current i (t), obtain faulted phase current i (t) dominant frequency frequency f
1(k);
Step 2, by the dominant frequency frequency f obtained in step 1
1(k) and electric power system power frequency f
0k () compares, construct rational criterion;
The criterion built is:
f
1(k)＞K
re·f
0(k)；
In above-mentioned criterion, K
refor safety factor, K
re> 1;
Step 3, carries out transmission line single-phase fault property identification according to the criterion that step 2 builds.
2. the power transmission line one-phase malfunction property identification method based on natural frequency according to claim 1, is characterized in that, described step 1 is specifically implemented according to following steps:
Step 1.1, gathers faulted phase current i (t) after the tripping operation of transmission line single-phase fault;
Step 1.2, carries out high pass filtered signals process to faulted phase current i (t) collected in step 1.1;
Step 1.3, carries out PRONY analysis to faulted phase current i (t) after step 1.2 processes, extracts the natural frequency dominant frequency frequency f containing transient state component in faulted phase current i (t) in PRONY analysis result
1(k).
3. the power transmission line one-phase malfunction property identification method based on natural frequency according to claim 1, is characterized in that, described step 3 is specifically implemented according to following steps:
If after circuit breaker disconnects, if meet the criterion requirement in step 2, reliably can be judged to transmission line single-phase fault character is transient fault;
Otherwise being then judged to transmission line single-phase fault character is permanent fault.
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| CN103616613B (en) * | 2013-11-27 | 2016-01-20 | 武汉大学 | A kind of Fault Locating Method utilizing transmission line of electricity two ends row ripple free-running frequency |
| CN104037740A (en) * | 2014-05-31 | 2014-09-10 | 袁芳革 | Arc fault disconnecting device |
| CN106451378A (en) * | 2016-10-28 | 2017-02-22 | 中国人民解放军后勤工程学院 | Identification and judgment method for switching into fault protection |
| CN106972452B (en) * | 2017-04-27 | 2019-02-05 | 西安交通大学 | Utilize the adaptive reclosing method of three-phase of shunt reactor mould power frequency feature |
| CN110474305B (en) * | 2018-05-10 | 2022-10-04 | 中国电力科学研究院有限公司 | Power transmission line protection method and device for preventing abnormal electrical quantity data |
| CN110596509A (en) * | 2019-07-09 | 2019-12-20 | 国网江苏省电力有限公司徐州供电分公司 | Power transmission line fault processing system based on different fault types and detection method thereof |
| CN110687477B (en) * | 2019-10-17 | 2021-04-02 | 武汉大学 | Rapid short-circuit fault detection system and method applied to high-voltage substation |
| CN113514727A (en) * | 2021-04-16 | 2021-10-19 | 广东电网有限责任公司电力科学研究院 | Power grid fault arc quenching assessment method, device, equipment and storage medium |
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