CN104410053A - DC power transmission system traveling wave protection method - Google Patents
DC power transmission system traveling wave protection method Download PDFInfo
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- CN104410053A CN104410053A CN201410611842.0A CN201410611842A CN104410053A CN 104410053 A CN104410053 A CN 104410053A CN 201410611842 A CN201410611842 A CN 201410611842A CN 104410053 A CN104410053 A CN 104410053A
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Abstract
The invention relates to a DC power transmission system traveling wave protection method and belongs to the VHV DC transmission technology field. According to the method, a line current and a line voltage of a local station are acquired, polar waves PI are figured out, S conversion on the polar waves is carried out for analysis, time frequency distribution characteristics of polar wave S conversion module values are acquired, and time of the largest abrupt change is the fault generation time; processing is carried out according to protection criteria and protection motion strategies, the criteria are that Pset is greater than or equal to Krel*Pmax, the reliable coefficient Krel is greater than 1, the Pmax is the largest value of polar wave S conversion module values of all outer-zone faults and disturbance, moreover, a polar wave setting value acquired through the formula above is obviously smaller than a first peak value of inner-zone fault polar wave S conversion module values, so no error protection motion generation is not only guaranteed during outer-zone faults, but also inner-zone protection motion is guaranteed to be reliable. The DC power transmission system traveling wave protection method can rapidly and accurately determine the faults and avoids line traveling wave protection error motion.
Description
Technical field
The present invention relates to a kind of DC transmission system traveling-wave protection method, belong to technical field of ultrahigh voltage direct current.
Background technology
After HVDC (High Voltage Direct Current) transmission line breaks down, usually containing abundant non-power frequency transient state component in its voltage and current, and fault component changes along with the change of the different fault condition such as fault moment, abort situation, transition resistance and system conditions.Therefore, effective analysis of failure transient signal, and extract corresponding fault characteristic information, has great importance for the quick acting of system protection, the accurate identification of fault type, the quick position of fault point.
Electrical power system transient signal is typical non-stationary signal, and in traditional signal transacting, Fourier transform establishes the contact between signal time domain and frequency domain, therefore becomes the most frequently used and the most direct method for the treatment of and analysis signal.Along with the development of computer technology, software simulating fast Fourier transform significantly improves arithmetic speed, but for the transient signal of non-stationary, Fourier transform can only be carried out in finite interval, just inevitably there is the energy leakage because time domain truncation produces in this, make the amplitude of frequency spectrum, phase place and frequency all may produce comparatively big error, make it be extremely restricted in the application of electrical power system transient signal transacting.For this reason, create if ratiometric correction method, energy barycenter correction method etc. are in order to improve traditional Fourier transform, the result making it analyze has good temporal resolution and precision, and this class is called time frequency analysis for the conversion of time-domain signal and frequency-region signal.The subject matter of tradition traveling-wave protection is can not the transient information of accurate assurance line fault, and the reliability of thus its action, quick-action, accuracy and antijamming capability etc. are all a greater impact.
Summary of the invention
The object of this invention is to provide a kind of DC transmission system traveling-wave protection method, with solve overcome traditional traveling-wave protection can not the problem of accurate assurance fault message.
The present invention provides a kind of DC transmission system traveling-wave protection method for solving the problems of the technologies described above, and this guard method comprises the following steps:
1) voltage signal and the current signal of DC transmission system is gathered, according to the voltage and current signal collected and surge impedance of a line computational scheme pole ripple;
2) S-transformation is carried out to circuit pole ripple, obtain the time-frequency distributions characteristic of modulus value before and after fault of pole ripple S-transformation;
3) the S-transformation frequency calculating pole ripple is the modulus value that pole ripple protection judges frequency range, and it can be used as Pset;
4). calculate the maximum P of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance
max, according to P
setwith P
maxrelation determine whether to carry out protection act to row ripple.
Described step 2) in pole ripple computing formula be:
P
I(t)＝Z
p·i(t)-u(t)
Wherein Z
pfor pole wave impedance, i (t) is the current signal gathered, and u (t) is the voltage signal gathered.
Described step 4) in Protection criteria be:
P
set≥K
rel·P
max
K
relfor safety factor, K
rel> 1; P
maxfor the maximum of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance, if above formula is set up, then traveling-wave protection action.
Described P
maxget 5 ~ 6, the protection of pole ripple judges that frequency range is 59 subharmonic or 61 subharmonic of S-transformation.
The invention has the beneficial effects as follows: the present invention gathers line current and the voltage of our station, calculate pole ripple P
i, then to pole ripple P
iadopt S swap-in capable analysiss, obtain the time-frequency distributions characteristic of pole ripple S-transformation modulus value, namely Sudden Changing Rate maximum moment is the fault generation moment; Then process according to Protection criteria and protection act strategy, criterion is P
set> K
relp
max, safety factor K
rel> 1, P
maxfor the maximum of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance; and meet first crest value that the pole ripple setting value calculated by above formula is significantly less than troubles inside the sample space pole ripple S-transformation modulus value; when so both can ensure external area error, protection can not misoperation, protection action message when can ensure again troubles inside the sample space.Method proposed by the invention can failure judgement accurately rapidly, avoids the risk that circuit traveling-wave protection malfunction causes.
Accompanying drawing explanation
Fig. 1 is the flow chart of DC transmission system traveling-wave protection method of the present invention;
Fig. 2 is the program flow diagram that traveling-wave protection fault signature extracts.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
1, line current and the voltage of our station is first gathered, according to the relation P of the sampled value of current and voltage signals and the pole wave impedance of DC line
i(t)=Z
pi (t)-u (t) calculates pole ripple P
i.
2. couple pole ripple P
iadopt S-transformation to analyze, obtain the time-frequency distributions characteristic of modulus value before and after fault of pole ripple S-transformation, namely Sudden Changing Rate maximum moment is that the moment occurs fault, and the S-transformation frequency calculating pole ripple is that the modulus value Ap of 3000HZ is as P
set.
The protection of pole ripple judges that frequency range is that after the ripple S-transformation of fault pole, frequency distribution, at the signal of 2950 ~ 3050Hz, generally gets 3000Hz signal.
3. calculate the maximum P of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance
max, judge P
setwhether be greater than K
relp
max, namely whether following formula is set up.
P
set≥K
rel·P
max
Wherein K
relfor safety factor, desirable 1.1 ~ 1.2, according to simulation result, P
maxget sensitivity and reliability that 5 ~ 6 can take into account protection, the protection of pole ripple judges that frequency range is 59 subharmonic or 61 subharmonic of S-transformation.
If 4. above formula is set up, then traveling-wave protection outlet action, sends line fault restart instruction, carries out DC system fault and recovers sequence.
Detect wavefront, carry out traveling-wave protection judgement, the protection of pole ripple judges that frequency range is that after the ripple S-transformation of fault pole, frequency distribution, at the signal of 2950 ~ 3050Hz, generally gets 3000Hz signal, and criterion is P
set>=K
relp
max, safety factor K
rel> 1, P
maxfor the maximum of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance; and meet first crest value that the pole ripple setting value calculated by above formula is significantly less than troubles inside the sample space pole ripple S-transformation modulus value; when so both can ensure external area error, protection can not misoperation; action message is protected, K when can ensure again troubles inside the sample space
rel> 1 desirable 1.1 ~ 1.2, P
maxdesirable 5 ~ 6.
The present invention can realize with built-in industrial parametric controller or PC device, and these two kinds of devices are devices that high-voltage dc transmission electrical domain is conventional.First protective device gathers circuit voltage and current, and generates pole ripple signal, then carries out the extraction of fault signature and the judgement of fault moment according to Fig. 1 and Fig. 2.
Claims (4)
1. a DC transmission system traveling-wave protection method, is characterized in that, this guard method comprises the following steps:
1) voltage signal and the current signal of DC transmission system is gathered, according to the voltage and current signal collected and surge impedance of a line computational scheme pole ripple;
2) S-transformation is carried out to circuit pole ripple, obtain the time-frequency distributions characteristic of modulus value before and after fault of pole ripple S-transformation;
3) the S-transformation frequency calculating pole ripple is the modulus value that pole ripple protection judges frequency range, and it can be used as Pset;
4). calculate the maximum P of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance
max, according to P
setwith P
maxrelation determine whether to carry out protection act to row ripple.
2. DC transmission system traveling-wave protection method according to claim 1, is characterized in that, described step 2) in pole ripple computing formula be:
P
I(t)＝Z
p·
i(t)-u(t)
Wherein Z
pfor pole wave impedance, i (t) is the current signal gathered, and u (t) is the voltage signal gathered.
3. DC transmission system traveling-wave protection method according to claim 2, is characterized in that, described step 4) in Protection criteria be:
P
set≥K
rel·P
max
K
relfor safety factor, K
rel> 1; P
maxfor the maximum of the pole ripple S-transformation modulus value in the middle of all external area errors and disturbance, if above formula is set up, then traveling-wave protection action.
4. DC transmission system traveling-wave protection method according to claim 3, is characterized in that, described P
maxget 5 ~ 6, the protection of pole ripple judges that frequency range is 59 subharmonic or 61 subharmonic of S-transformation.
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|---|---|---|---|
| CN201410611842.0A CN104410053B (en) | 2014-11-03 | 2014-11-03 | DC power transmission system traveling wave protection method |
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| CN104410053B CN104410053B (en) | 2017-05-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098738A (en) * | 2015-09-08 | 2015-11-25 | 山东大学 | Pilot protection method of high-voltage direct current transmission line based on S transformation |
| CN105790239A (en) * | 2016-05-19 | 2016-07-20 | 山东大学 | High-voltage direct-current power transmission line non-unit protection method based on S transformation |
| CN108199357A (en) * | 2018-01-17 | 2018-06-22 | 华北电力大学（保定） | A kind of method of DC power transmission line traveling-wave protection |
| CN113655339A (en) * | 2021-08-20 | 2021-11-16 | 许继集团有限公司 | Fault positioning method and device for direct-current transmission line protection system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101964515A (en) * | 2010-08-27 | 2011-02-02 | 昆明理工大学 | Method for converting boundary element by extra-high voltage direct current transmission line mode voltage S |
| CN102135560A (en) * | 2011-02-23 | 2011-07-27 | 山东大学 | Disturbance identification method used during intrusion of lightning waves in transformer substation |
| US8067942B2 (en) * | 2007-09-28 | 2011-11-29 | Florida State University Research Foundation | Method for locating phase to ground faults in DC distribution systems |
| WO2011150985A1 (en) * | 2010-06-02 | 2011-12-08 | Areva T&D Uk Limited | Method and system for online ferroresonance detection |
-
2014
- 2014-11-03 CN CN201410611842.0A patent/CN104410053B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8067942B2 (en) * | 2007-09-28 | 2011-11-29 | Florida State University Research Foundation | Method for locating phase to ground faults in DC distribution systems |
| WO2011150985A1 (en) * | 2010-06-02 | 2011-12-08 | Areva T&D Uk Limited | Method and system for online ferroresonance detection |
| CN101964515A (en) * | 2010-08-27 | 2011-02-02 | 昆明理工大学 | Method for converting boundary element by extra-high voltage direct current transmission line mode voltage S |
| CN102135560A (en) * | 2011-02-23 | 2011-07-27 | 山东大学 | Disturbance identification method used during intrusion of lightning waves in transformer substation |
Non-Patent Citations (2)
| Title |
|---|
| 束洪春等: "±800 kV特高压直流输电线路单端电气量暂态保护", 《中国电机工程学报》 * |
| 束洪春等: "±800kV直流输电线路的极波暂态量保护", 《中国电机工程学报》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105098738A (en) * | 2015-09-08 | 2015-11-25 | 山东大学 | Pilot protection method of high-voltage direct current transmission line based on S transformation |
| CN105098738B (en) * | 2015-09-08 | 2017-09-29 | 山东大学 | A kind of HVDC transmission line longitudinal protection method based on S-transformation |
| CN105790239A (en) * | 2016-05-19 | 2016-07-20 | 山东大学 | High-voltage direct-current power transmission line non-unit protection method based on S transformation |
| CN108199357A (en) * | 2018-01-17 | 2018-06-22 | 华北电力大学（保定） | A kind of method of DC power transmission line traveling-wave protection |
| CN108199357B (en) * | 2018-01-17 | 2019-10-11 | 华北电力大学（保定） | A kind of method of DC power transmission line traveling-wave protection |
| CN113655339A (en) * | 2021-08-20 | 2021-11-16 | 许继集团有限公司 | Fault positioning method and device for direct-current transmission line protection system |
| CN113655339B (en) * | 2021-08-20 | 2024-05-10 | 许继集团有限公司 | Fault positioning method and device for direct-current transmission line protection system |
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| CN104410053B (en) | 2017-05-03 |
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