CN110058120A - A kind of extra high voltage direct current transmission line fault recognition method based on voltage transformation trend chi sequence Differential Detection - Google Patents

A kind of extra high voltage direct current transmission line fault recognition method based on voltage transformation trend chi sequence Differential Detection Download PDF

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Publication number
CN110058120A
CN110058120A CN201910204327.3A CN201910204327A CN110058120A CN 110058120 A CN110058120 A CN 110058120A CN 201910204327 A CN201910204327 A CN 201910204327A CN 110058120 A CN110058120 A CN 110058120A
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China
Prior art keywords
voltage
chi sequence
sod
extra
sequence differential
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Pending
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CN201910204327.3A
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Chinese (zh)
Inventor
束洪春
王璇
代月
田鑫萃
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Kunming University of Science and Technology
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Kunming University of Science and Technology
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Priority to CN201910204327.3A priority Critical patent/CN110058120A/en
Publication of CN110058120A publication Critical patent/CN110058120A/en
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/081Locating faults in cables, transmission lines, or networks according to type of conductors
    • G01R31/086Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08Locating faults in cables, transmission lines, or networks
    • G01R31/088Aspects of digital computing
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/268Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems

Abstract

The present invention relates to a kind of extra high voltage direct current transmission line fault recognition methods based on voltage transformation trend chi sequence Differential Detection, belong to Relay Protection Technology in Power System field.The false voltage data obtained by the high speed acquisition device of measuring end are read first;Secondly chi sequence difference SOD transformation is carried out to acquired voltage data;When the false voltage Su (n) converted through SOD is less than setting valve 100, judge that external area error occurs, when Su (n) is greater than setting valve 100, judges that troubles inside the sample space occurs.Voltage Su (n) of the present invention after 4 rank chi sequence differential transformations theoretically strengthens variation degree, has filtered off low frequency signal, be conducive to eliminate noise, can preferably distinguish in the area in external area error curve.

Description

A kind of extra-high voltage direct-current transmission based on voltage transformation trend chi sequence Differential Detection Line fault recognition methods
Technical field
The extra high voltage direct current transmission line event based on voltage transformation trend chi sequence Differential Detection that the present invention relates to a kind of Hinder recognition methods, belongs to Relay Protection Technology in Power System field.
Background technique
The key of protection of direct current supply line is the accurate and reliable identification of line fault.DC line two sides are by flat wave electricity The physical entity boundary that anti-device and DC filter are constituted causes transient state electrical quantity to have high frequency blocking action failure, so that Route observed terminals transient state electrical quantity radio-frequency component difference is totally different under the inside and outside portion's failure of route, this sentences for DC line protection According to the core foundation of setting, the various inside and outside portion's fault waveform high frequencies of extra high voltage direct current transmission line that are based on can be constructed based on this and contained The line-internal fault identification element of algorithm is portrayed and characterized to amount otherness.
The protection scheme of existing SIEMENS DC line be using voltage, current changing rate as the traveling-wave protection of core criterion, Du/dt is not only used as start-up criterion, but also the operation equation as line-internal failure in the protection.In this way, if should guarantee route The sensitivity of route protection act under internal fault condition, again guarantee route external fault under route protection it is reliable motionless Make, both this is often difficult to take into account, particularly with distal end high resistive fault.Therefore, the successful experience of AC system protection is used for reference, Pole element and main protection function is selected to set up separately fault initiating element, failure herein, separate configurations, to improve SIEMENS traveling wave master The performance of protection.When transmission line of electricity breaks down, the fault traveling wave that fault point will be propagated along generation to two side bus, du/ The main protection of dt is once differentiation operation have been done to waveform, but when ground fault occurs for distal end, voltage change ratio and area are outer former Voltage change ratio is very close to being difficult to seek fault identification criterion when barrier.If fault signature can be amplified, noise is eliminated as much as, Then can identification to distal end high resistive fault it is of great advantage.Chi sequence differential transformation, that is, SOD transformation can meet this requirement.SOD Chi sequence differential transformation is carried out with the failure initial voltage data of extraction, and then quickly detects failure initial voltage, and SOD Preceding several sampled points that transformation need to only extract failure voltage signal can carry out.It is the reinforcement to fault signature magnitude, without It is simple concern phase property.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of spies based on voltage transformation trend chi sequence Differential Detection High voltage direct current transmission line fault recognition methods, to solve the above problems.
The technical scheme is that a kind of extra-high voltage direct-current based on voltage transformation trend chi sequence Differential Detection is defeated The false voltage data obtained by the high speed acquisition device of measuring end are read in line fault recognition methods first;Secondly to institute The voltage data of acquisition carries out chi sequence difference SOD transformation;When the false voltage Su (n) converted through SOD is less than setting valve 100 When, judge that external area error occurs, when Su (n) is greater than setting valve 100, judges that troubles inside the sample space occurs.
Specific steps are as follows:
The first step, when transmission system breaks down, measurement point obtain primary fault voltage uM
The data are carried out 4 rank chi sequence differential transformations, obtained by false voltage data when second step, interception 2ms in window Take Su (n);
Su (n)=uM(n)-4×uM(n-1)+6×uM(n-2)-4×uM(n-3)+uM(n-4) (1)
In formula, uMIndicate the voltage of measurement end, what n was indicated is the number of sampled point;
Third step forms fault identification criterion using the transformed value Su (n) of SOD:
When Su (n) is less than setting valve 100, it is judged as external area error;
When Su (n) is greater than setting valve 100, judge that troubles inside the sample space occurs.
Sample rate is 10kHz in the present invention.
The principle of the present invention is: obtaining false voltage by the high speed acquisition device of measuring end, DC line two sides are by flat wave The physical entity boundary that reactor and DC filter are constituted causes transient state electrical quantity to have high frequency blocking action failure, makes Route observed terminals transient state electrical quantity radio-frequency component difference is totally different under the inside and outside portion's failure of route, this is DC line protection The core foundation of criterion setting.The failure initial voltage data that SOD is extracted carry out chi sequence differential transformation, and then quickly Failure initial voltage is detected, and SOD converts the preceding several sampled points that need to extract failure voltage signal and can carry out.It is to event Hinder the reinforcement of characterizing magnitudes, rather than concern phase property merely.The transformed value of SOD is carried out according to false voltage to differentiate Troubles inside the sample space and external area error.
The beneficial effects of the present invention are:
1, when ground fault occurs for distal end, voltage change ratio and when external area error voltage change ratio very close to being difficult to ask Take fault identification criterion.And SOD transformation can amplify fault signature, be of great benefit to the identification of distal end high resistive fault.SOD is extracted Failure initial voltage data carry out chi sequence differential transformation, and then quickly detect failure initial voltage, and SOD transformation is only Preceding several sampled points that failure voltage signal need to be extracted can carry out.It is the reinforcement to fault signature magnitude, rather than simple Pay close attention to phase property.
2, the voltage Su (n) after 4 rank chi sequence differential transformations theoretically strengthens variation degree, has filtered off low frequency Signal, be conducive to eliminate noise, can preferably distinguish in the area in external area error curve.
Detailed description of the invention
Fig. 1 is extra-high voltage DC transmission system structure chart of the present invention;
Fig. 2 is in the embodiment of the present invention 1 away from route false voltage original waveform figure positive at the 800km of the end M;
Fig. 3 is to convert waveform diagram away from anode route false voltage SOD at the 800km of the end M in the embodiment of the present invention 1;
Fig. 4 is rectification side ABC three-phase ground false voltage original waveform figure in the embodiment of the present invention 1;
Fig. 5 is that rectification side ABC three-phase ground false voltage SOD converts waveform diagram in the embodiment of the present invention 1;
Fig. 6 is in the embodiment of the present invention 2 away from route false voltage original waveform figure positive at the 400km of the end M;
Fig. 7 is to convert waveform diagram away from anode route false voltage SOD at the 400km of the end M in the embodiment of the present invention 2;
Fig. 8 is rectification side AB double earthfault voltage original waveform figure in the embodiment of the present invention 2;
Fig. 9 is that rectification side AB double earthfault voltage SOD converts waveform diagram in the embodiment of the present invention 2;
Figure 10 is in the embodiment of the present invention 3 away from route false voltage original waveform figure positive at the 200km of the end M;
Figure 11 is to convert waveform diagram away from anode route false voltage SOD at the 200km of the end M in the embodiment of the present invention 3;
Figure 12 is rectification side A singlephase earth fault voltage original waveform figure in the embodiment of the present invention 3;
Figure 13 is that rectification side A singlephase earth fault voltage SOD converts waveform diagram in the embodiment of the present invention 3.
Specific embodiment
With reference to the accompanying drawings and detailed description, the invention will be further described.
Embodiment 1: quasi- east-East China ± 1100kV extra-high voltage DC transmission system structure chart is as shown in Figure 1, its line parameter circuit value As follows: DC power transmission line overall length is 3300km.
(1) false voltage data are obtained in measurement point according to the first step in specification.
(2) false voltage data when taking 2ms according to the second step in specification in window, hand over false voltage data Fork sequence differential transformation, obtains Su (n).
(3) the transformed value Su (n) of the SOD according to obtained in the third step of specification utilization (2) forms fault identification and sentences According to.Su (n) is significantly less than whole after Su (n) is significantly greater than setting valve 100 after failure occurs as shown in Figure 3, and failure occurs in Fig. 5 Definite value 100.It is the analysis of two kinds of fault conditions below.
(4) abort situation: away from line failure positive at the 800km of the end M;Failure start time is 0.7s;Sample frequency For 10kHz.
(5) abort situation: rectification side ABC three-phase ground failure;Failure start time is 0.7s;Sample frequency is 10kHz.
Embodiment 2: quasi- east-East China ± 1100kV extra high voltage direct current transmission line simulation model is as shown in Figure 1, its route is joined Number is as follows: DC power transmission line overall length is 3300km.
(1) false voltage data are obtained in measurement point according to the first step in specification.
(2) false voltage data when taking 2ms according to the second step in specification in window, hand over false voltage data Fork sequence differential transformation, obtains Su (n).
(3) the transformed value Su (n) of the SOD according to obtained in the third step of specification utilization (2) forms fault identification and sentences According to.Su (n) is significantly less than whole after Su (n) is significantly greater than setting valve 100 after failure occurs as shown in Figure 7, and failure occurs in Fig. 9 Definite value 100.It is the analysis of two kinds of fault conditions below.
(4) abort situation: away from line failure positive at the 400km of the end M;Failure start time is 0.7s;Sample frequency For 10kHz.
(5) abort situation: rectification side AB double earthfault;Failure start time is 0.7s;Sample frequency is 10kHz.
Embodiment 3: quasi- east-East China ± 1100kV extra high voltage direct current transmission line simulation model is as shown in Figure 1, its route is joined Number is as follows: DC power transmission line overall length is 3300km.
(1) false voltage data are obtained in measurement point according to the first step in specification.
(2) false voltage data when taking 2ms according to the second step in specification in window, hand over false voltage data Fork sequence differential transformation, obtains Su (n).
(3) the transformed value Su (n) of the SOD according to obtained in the third step of specification utilization (2) forms fault identification and sentences According to.Su (n) is significantly less than after Su (n) is significantly greater than setting valve 100 after failure occurs as shown in Figure 11, and failure occurs in Figure 13 Setting valve 100.It is the analysis of two kinds of fault conditions below.
(4) abort situation: away from line failure positive at the 200km of the end M;Failure start time is 0.7s;Sample frequency For 10kHz.
(5) abort situation: rectification side A phase ground fault;Failure start time is 0.7s;Sample frequency is 10kHz.
In conjunction with attached drawing, the embodiment of the present invention is explained in detail above, but the present invention is not limited to above-mentioned Embodiment within the knowledge of a person skilled in the art can also be before not departing from present inventive concept Put that various changes can be made.

Claims (2)

1. a kind of extra high voltage direct current transmission line fault recognition method based on voltage transformation trend chi sequence Differential Detection, It is characterized in that: reading the false voltage data obtained by the high speed acquisition device of measuring end first;Secondly to acquired voltage Data carry out chi sequence difference SOD transformation;When the false voltage Su (n) converted through SOD is less than setting valve 100, judge to send out Raw external area error when Su (n) is greater than setting valve 100 judges that troubles inside the sample space occurs.
2. the extra high voltage direct current transmission line according to claim 1 based on voltage transformation trend chi sequence Differential Detection Fault recognition method, it is characterised in that specific steps are as follows:
The first step, when transmission system breaks down, measurement point obtain primary fault voltage uM
The data are carried out 4 rank chi sequence differential transformations, obtain Su by false voltage data when second step, interception 2ms in window (n);
Su (n)=uM(n)-4×uM(n-1)+6×uM(n-2)-4×uM(n-3)+uM(n-4) (1)
In formula, uMIndicate the voltage of measurement end, what n was indicated is the number of sampled point;
Third step forms fault identification criterion using the transformed value Su (n) of SOD:
When Su (n) is less than setting valve 100, it is judged as external area error;
When Su (n) is greater than setting valve 100, judge that troubles inside the sample space occurs.
CN201910204327.3A 2019-03-18 2019-03-18 A kind of extra high voltage direct current transmission line fault recognition method based on voltage transformation trend chi sequence Differential Detection Pending CN110058120A (en)

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