CN107959282A - A kind of circuit lightning fault of both ends bipolar HVDC selects pole method - Google Patents
A kind of circuit lightning fault of both ends bipolar HVDC selects pole method Download PDFInfo
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- CN107959282A CN107959282A CN201711242429.1A CN201711242429A CN107959282A CN 107959282 A CN107959282 A CN 107959282A CN 201711242429 A CN201711242429 A CN 201711242429A CN 107959282 A CN107959282 A CN 107959282A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency 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
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/267—Sectionalised 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 parallel lines and wires
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Abstract
The invention discloses a kind of circuit lightning fault of both ends bipolar HVDC to select pole method, it is characterised in that：Comprise the following steps：Under given data window length, the integrated value of cathode and each voltage jump amount of negative DC transmission line of electricity rectification side is calculated, and calculates the corresponding absolute value of the integrated value；The average value of each absolute value is asked for, obtained average value is substituted into algorithm start-up criterion, if meeting start-up criterion, algorithm starts, and enters step (3), and otherwise algorithm does not start, and returns to original state；After algorithm starts, the ratio of cathode absolute value and anode absolute value in calculation procedure (1), selects pole criterion, so as to determine whether to break down by ratio substitution the single-ended of DC line lightning fault.Calculation amount of the present invention is small, and algorithm is simple and reliable, saves call duration time, avoids the communication error that both-end criterion is likely to occur, have Practical meaning.
Description
Technical field
The present invention relates to a kind of electric power system control and protection technique field, is to be related to one kind to be suitable for two specifically
The DC line lightning fault of end bipolar HVDC selects pole method.
Background technology
The DC side wiring of the bipolar neutral ground DC transmission engineering in both ends be by two can independent operating monopole it is big
Earthed return mode is formed.This mode of connection flexibility is good, and reliability is high, is used by most of DC transmission engineerings.Two
The two-wire line paired running of bipolar direct current transmission system is held, there are electromagnetic coupled, wherein during a pole line fault, perfects polar curve
Larger voltage and current change rate may be induced on road, causes to perfect polar curve road false protection, so as to cause monopole failure
When bi-pole protection block, influence the safe and stable operation of sending end power grid and receiving end power grid.Therefore, it is necessary to correctly select failure pole.
Investigation statistics are shown, end in March, 2014, and State Grid Corporation of China possesses DC line 13 altogether, are amounted to
16587.2km.2010-2015 years, lightning stroke trip account for 330kV and the above transmission line of alternation current tripping sum 39.4%~
50.8%, lightning stroke, which is restarted, accounts for ± 500kV and above direct current transmission line fault restarts the 43.5%~64.3% of sum.Lightning stroke is
The primary factor that high voltage direct current transmission line fault is restarted.The Control and protection system of high voltage direct current transmission project quick and precisely moves
Work is the primary guarantee of the fault lightning stroke of reply, and correct decision lightning fault pole is the premise for protecting precision maneuver.
Lightning current frequency range is larger, and contains more higher hamonic wave, the electromagnetism coupling between HVDC transmission line pole
Cooperation is particularly evident in the case of lightning stroke.The Control protection system of existing major part DC engineering does not account for high fdrequency component
Electromagnetic coupled.The existing failure using the low frequency component of DC current or voltage construction selects pole criterion, without verification in thunder
Hit acting characteristic when failure and bipolar failure.
After HVDC transmission line breaks down, failure polar curve road and the ratio of non-faulting pole tension Sudden Changing Rate amplitude are near
Approximately equal to the ratio between the self-impedance of conducting wire and mutual impedance.Line parameter circuit value test result shows that HVDC transmission line conducting wire hinders certainly
It is anti-to be more than mutual impedance, so that when lightning fault occurs for HVDC transmission line, the voltage jump amount amplitude on failure polar curve road
More than non-faulting pole.Using this feature, the DC line lightning fault of both ends bipolar HVDC engineering can be built
Select pole criterion.
The content of the invention
The present invention is to solve the above-mentioned problems, it is proposed that a kind of circuit lightning fault choosing of both ends bipolar HVDC
Pole method, the present invention can ask for cathode and negative DC transmission line of electricity rectification side voltage dashed forward under given data window length
The absolute average of the integrated value of variable, algorithm start-up criterion is relatively constructed by the average value and setting threshold value；Utilize height
When pressing DC power transmission line generation lightning fault, the voltage jump amount amplitude on failure polar curve road is more than this feature of non-faulting pole,
Construct the single-ended lightning fault of DC line and select pole criterion.The criterion only calculates HVDC transmission line rectification side voltage jump
Integrated value and its ratio are measured, calculation amount is small, and algorithm is simple and reliable, saves call duration time, avoids what both-end criterion was likely to occur
Communication error, has Practical meaning.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of circuit lightning fault of both ends bipolar HVDC selects pole method, comprises the following steps：
Step (1)：Under given data window length, cathode and each voltage of negative DC transmission line of electricity rectification side are calculated
The integrated value of Sudden Changing Rate, and calculate the corresponding absolute value of the integrated value；
Step (2)：The average value of each absolute value is asked for, obtained average value is substituted into algorithm start-up criterion, if meeting to open
Dynamic criterion, then algorithm startup, enters step (3), and otherwise algorithm does not start, and returns to original state；
Step (3)：After algorithm starts, the ratio of cathode absolute value and anode absolute value in calculation procedure (1), by the ratio
Substitute into the single-ended of DC line lightning fault and select pole criterion, so as to determine whether to break down.
Further, in step (1), the length of the data window is：5ms, the basis of design of the length are：Failure
Afterwards within 5ms, control system is not actuated or control system starts to adjust but is not adjusted to stable state yet, utilizes 5ms after failure
Within the protection of direct current supply line criterion that forms of measurement data can take no account of the influence of control system, integral and calculating in theory
Data window length preferably smaller than be equal to 5ms；And thunder and lightning duration of disturbance is generally 3ms, in order to preferably offset lightning stroke
The influence of interference, the data window length of integral and calculating are preferably greater than 3ms, therefore, the number of this paper voltage jump amount integral and calculatings
It is preferably 5ms according to the choosing of window length.
Further, the cathode in the step (1) and the integration of negative DC transmission line of electricity rectification side voltage jump amount
The specific solution procedure of value is as follows：
Step (1-1)：Calculate cathode and negative DC transmission line of electricity rectification side voltage jump amount.The calculating of voltage jump amount
Spacing is preferably greater than the data window length of integral and calculating, is taken as 10ms herein.If sample frequency is 100kHz, cathode and negative DC
The calculating formula of transmission line of electricity rectification side voltage jump amount is：
Δurj(i)=urj(i)-urj(i-1000)
Wherein, i is sampled point ordinal number；R represents rectification side circuit electrical quantity measurement point；J represents p or n, represents cathode or negative
Pole.urjRepresent negative or positive electrode DC line rectification side measurement voltage；ΔurjRepresent negative or positive electrode DC line rectification side electricity
Press Sudden Changing Rate.
Step (1-2)：Calculate the integrated value of cathode and negative DC transmission line of electricity rectification side voltage jump amount
Wherein, i is sampled point ordinal number, i=1,2 ... ..., N；N represents the sampled point number chosen in calculation window；R tables
Show rectification side circuit electrical quantity measurement point；J represents p or n, represents negative or positive electrode, Δ urjRepresent negative or positive electrode DC line
Rectification side voltage jump amount.
Algorithm start-up criterion in the step (2)：
Wherein, i=1,2 ... ..., N；N represents the sampled point number chosen in calculation window；k1To set threshold value.It is right
The absolute value averaged of voltage jump amount integrated value, by the average value and setting threshold value k1Compare, meet to appoint in the two poles of the earth
The average value of one pole is more than setting threshold value k1, algorithm startup, otherwise algorithm does not start.
Further, the specific solution procedure in the step (3) is：
Step (3-1)：After algorithm starts, the ratio of cathode absolute value and anode absolute value in calculation procedure (1)
Step (3-2)：If the ratio is more than setting threshold value k2, then it is determined as positive electrode fault：
Otherwise, enter step (3-3)；Wherein, i is sampled point ordinal number, i=1,2 ... ..., N；N represents to choose calculation window
Interior sampled point number；ΔurpRepresent positive DC line commutation side voltage jump amount；ΔurnRepresent negative DC line commutation
Side voltage jump amount；
Step (3-3)：If the ratio is less thanThen it is determined as anode failure：
Otherwise, enter step (3-4)；
Step (3-4)：If the ratio is more than setting threshold value k3, and less than setting threshold value k4, then it is determined as bipolar event
Barrier：
Otherwise, it is determined that it is fault-free.
Compared with prior art, beneficial effects of the present invention are：
(1) DC line lightning fault selects pole criterion only to calculate voltage jump amount integrated value and its ratio in the present invention, counts
Calculation amount is small, and algorithm is simple and reliable；
(2) DC line lightning fault selects pole criterion to measure electricity merely with HVDC transmission line rectification side in the present invention
Pressure participates in calculating, and is single-ended criterion, compared to both-end criterion, saves call duration time, avoids the communication error being likely to occur；
(3) DC line lightning fault selects pole scheme to consider the situation of bipolar failure in the present invention, can accurately differentiate
Positive electrode fault, anode failure and bipolar failure.
Brief description of the drawings
The accompanying drawings which form a part of this application are used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are used to explain the application, do not form the restriction to the application.
Fig. 1 is the principle of the present invention block diagram；
Fig. 2 is the lightning stroke position view of the invention selected in the scheme simulating, verifying case of pole；
Fig. 3 is each voltage jump amount integrated value selected in the scheme simulating, verifying case of pole of the embodiment of the present invention.
Embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
It is noted that described further below be all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Following embodiments are a kind of typical embodiment of the application, as shown in Figure 1, being based on MATLAB data processing journeys
Sequence has worked out DC line lightning fault and has selected pole scheme calculation procedure.Based on PSCAD/EMTDC electromagnetic transient in power system softwares
With the actual parameter of bipolar both ends high voltage direct current transmission project, HVDC transmission line lightning stroke transient emulation is carried out, to obtain
Failure is taken to select pole plan-validation data.
In the case where bipolar total head is symmetrically just sending the method for operation, set 6 kinds of emulation cases as follows：To diverse location on electrode line road
Fault lightning stroke emulated, lightning stroke position be taken as apart from rectification side measurement point be circuit overall length 0.1%, 10% and
50%, simulated fault situation be expressed as " LIF, 0.1% ", " LIF, 10% ", " LIF, 50% ", amplitude of lightning current is taken as
60kA；Lightning fault occurs for anode circuit midpoint, is expressed as that " N, LIF ", amplitude of lightning current are taken as 60kA；Send out at bipolar line midpoint
Raw lightning fault, is expressed as that " LL, LIF ", amplitude of lightning current are taken as 100kA；Generation lightning stroke interference, is expressed as " LD ".Lightning stroke position
Put as shown in Figure 2.
The data window length of integral and calculating elects 5ms, sample frequency 100kHz as, then the sampled point number in computer capacity
N is 500.
Fig. 3 gives cathode circuit rectification side voltage jump amount integrated value under 6 kinds of simulation scenarios of the aboveAnd anode
Line commutation side voltage jump amount integrated valuek1When being taken as 0.1, failure selects pole criterion equal in the case of 5 kinds of lightning faults
Start；During generation lightning stroke interference, voltage jump amount integrated value is less than threshold value, and failure selects pole criterion not start, such as black in Fig. 3
Shown in straight line.During monopole failure, failure polar curve road voltage jump amount integrated value is much larger than non-faulting pole, during bipolar failure, the two poles of the earth
Line voltage distribution Sudden Changing Rate integrated value is of substantially equal.
Voltage jump amount integrated value and its ratio after table 1 occurs for various fault conditions during 5ms, and failure select pole to sentence
According to differentiation result.As shown by data, k are emulated in table 12When being taken as 2, this paper failures select pole criterion can accurate Judging fault pole,
And leave larger nargin.k3It is taken as 0.8, k4When being taken as 1.2, bipolar failure can be accurately differentiated.Other a large amount of simulation results of author
Show, which selects pole criterion to be also appropriately determined failure pole under various short circuit grounding fault conditions.
Voltage jump amount integrated value and its ratio under 1 lightning fault of table and lightning stroke disturbed condition
The foregoing is merely the preferred embodiment of the application, the application is not limited to, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Although above-mentioned be described the embodiment of the present invention with reference to attached drawing, model not is protected to the present invention
The limitation enclosed, those skilled in the art should understand that, on the basis of technical scheme, those skilled in the art are not
Need to make the creative labor the various modifications that can be made or deformation still within protection scope of the present invention.
Claims (7)
1. a kind of circuit lightning fault of both ends bipolar HVDC selects pole method, it is characterised in that：Comprise the following steps：
Step (1)：Under given data window length, cathode and each voltage jump of negative DC transmission line of electricity rectification side are calculated
The integrated value of amount, and calculate the corresponding absolute value of the integrated value；
Step (2)：The average value of each absolute value is asked for, obtained average value is substituted into algorithm start-up criterion, startup is sentenced if meeting
According to then algorithm starts, and enters step (3), and otherwise algorithm does not start, and returns to original state；
Step (3)：After algorithm starts, the ratio of cathode absolute value and anode absolute value, which is substituted into calculation procedure (1)
The single-ended of DC line lightning fault selects pole criterion, so as to determine whether to break down.
2. a kind of circuit lightning fault of both ends bipolar HVDC according to claim 1 selects pole method, it is special
Sign is：In step (1), the length of the data window is：5ms.
3. a kind of circuit lightning fault of both ends bipolar HVDC according to claim 1 selects pole method, it is special
Sign is：The specific of the integrated value of cathode and negative DC transmission line of electricity rectification side voltage jump amount in the step (1) is asked
It is as follows to solve step：
(1-1)：Calculate cathode and negative DC transmission line of electricity rectification side voltage jump amount；
(1-2)：Calculate the integrated value of cathode and negative DC transmission line of electricity rectification side voltage jump amount.
4. a kind of circuit lightning fault of both ends bipolar HVDC according to claim 3 selects pole method, it is special
Sign is：In step (1-2), the formula of integrated value of cathode and negative DC transmission line of electricity rectification side voltage jump amount is calculated such as
Under：
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Wherein, i is sampled point ordinal number, i=1,2 ... ..., N；N represents the sampled point number chosen in calculation window；R represents whole
Flow side line road electrical quantities measurement point；J represents p or n, represents negative or positive electrode, Δ urjRepresent negative or positive electrode DC line rectification
Side voltage jump amount.
5. a kind of circuit lightning fault of both ends bipolar HVDC according to claim 1 selects pole method, it is special
Sign is：Algorithm start-up criterion in step (2)：
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Wherein, i is sampled point ordinal number, i=1,2 ... ..., N；N represents the sampled point number chosen in calculation window；k1For setting
Threshold value.To the absolute value averaged of voltage jump amount integrated value, by the average value and setting threshold value k1Compare, meet
The average value of any pole is more than setting threshold value k in the two poles of the earth1, algorithm startup, otherwise algorithm does not start.
6. a kind of circuit lightning fault of both ends bipolar HVDC according to claim 1 selects pole method, it is special
Sign is：Specific solution procedure in the step (3) is：
(3-1)：After algorithm starts, the ratio of cathode absolute value and anode absolute value in calculation procedure (1)；
(3-2)：If the ratio is more than setting threshold value k2, then it is determined as positive electrode fault：
Otherwise, enter step (3-3)；
(3-3)：If the ratio is less thanThen it is determined as anode failure：
Otherwise, enter step (3-4)；
(3-4)：If the ratio is more than setting threshold value k3, and less than setting threshold value k4, then it is determined as bipolar failure：
Otherwise, it is determined that it is fault-free.
7. a kind of circuit lightning fault of both ends bipolar HVDC according to claim 6 selects pole method, it is special
Sign is：In step (3-1), calculate cathode absolute value and the specific algorithm of the ratio of anode absolute value is：
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Wherein, i is sampled point ordinal number, i=1,2 ... ..., N；N represents to choose the sampled point number in calculation window；ΔurpRepresent
Positive DC line commutation side voltage jump amount；ΔurnRepresent negative DC line commutation side voltage jump amount.
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| CN108872724A (en) * | 2018-06-13 | 2018-11-23 | 国网浙江省电力有限公司金华供电公司 | For obtaining the detection method of UHVDC Transmission Lines state |
| CN108872689A (en) * | 2018-06-13 | 2018-11-23 | 国网浙江省电力有限公司金华供电公司 | A kind of UHVDC Transmission Lines electroscopic device based on feature electric and magnetic fields |
| CN110336257A (en) * | 2019-07-04 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of anti-lightning strike and abnormal protection of direct current supply line method and system several greatly |
| CN110336256A (en) * | 2019-07-04 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of DC power transmission line ratio brake selects pole method and system |
| CN110429571A (en) * | 2019-07-04 | 2019-11-08 | 中国电力科学研究院有限公司 | A kind of protection of direct current supply line method and system of optional pole |
| CN110632454A (en) * | 2019-09-06 | 2019-12-31 | 昆明理工大学 | Fault pole selection method by constructing unbalanced directional voltage |
| CN112713577A (en) * | 2020-12-24 | 2021-04-27 | 中国电力科学研究院有限公司 | Direct-current transmission line pole selection method and system for eliminating interelectrode mutual inductance influence |
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| CN113612205A (en) * | 2021-07-09 | 2021-11-05 | 天津大学 | MMC-HVDC transient state quantity protection method capable of identifying lightning stroke interference |
| CN113917280A (en) * | 2021-09-28 | 2022-01-11 | 西安理工大学 | Method for judging lightning stroke interference and fault of high-voltage direct-current transmission line |
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Cited By (18)
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| CN108872724A (en) * | 2018-06-13 | 2018-11-23 | 国网浙江省电力有限公司金华供电公司 | For obtaining the detection method of UHVDC Transmission Lines state |
| CN108872689A (en) * | 2018-06-13 | 2018-11-23 | 国网浙江省电力有限公司金华供电公司 | A kind of UHVDC Transmission Lines electroscopic device based on feature electric and magnetic fields |
| CN108872689B (en) * | 2018-06-13 | 2023-12-05 | 国网浙江省电力有限公司金华供电公司 | Extra-high voltage direct current line electroscope based on characteristic electric field and magnetic field |
| CN110336256A (en) * | 2019-07-04 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of DC power transmission line ratio brake selects pole method and system |
| CN110429571A (en) * | 2019-07-04 | 2019-11-08 | 中国电力科学研究院有限公司 | A kind of protection of direct current supply line method and system of optional pole |
| CN110336257B (en) * | 2019-07-04 | 2023-01-31 | 中国电力科学研究院有限公司 | Lightning-proof and abnormal large-number direct-current transmission line protection method and system |
| CN110336257A (en) * | 2019-07-04 | 2019-10-15 | 中国电力科学研究院有限公司 | A kind of anti-lightning strike and abnormal protection of direct current supply line method and system several greatly |
| CN110336256B (en) * | 2019-07-04 | 2022-04-01 | 中国电力科学研究院有限公司 | Direct-current transmission line ratio braking pole selection method and system |
| CN110632454A (en) * | 2019-09-06 | 2019-12-31 | 昆明理工大学 | Fault pole selection method by constructing unbalanced directional voltage |
| CN110632454B (en) * | 2019-09-06 | 2022-02-11 | 昆明理工大学 | Fault pole selection method by constructing unbalanced directional voltage |
| CN112713577A (en) * | 2020-12-24 | 2021-04-27 | 中国电力科学研究院有限公司 | Direct-current transmission line pole selection method and system for eliminating interelectrode mutual inductance influence |
| CN112713577B (en) * | 2020-12-24 | 2023-08-22 | 中国电力科学研究院有限公司 | DC transmission line pole selection method and system for eliminating interelectrode mutual inductance influence |
| CN112865031A (en) * | 2021-01-11 | 2021-05-28 | 许昌许继软件技术有限公司 | High-voltage direct-current transmission line lightning stroke interference identification method based on current attenuation ratio |
| CN113612205A (en) * | 2021-07-09 | 2021-11-05 | 天津大学 | MMC-HVDC transient state quantity protection method capable of identifying lightning stroke interference |
| CN113612205B (en) * | 2021-07-09 | 2022-11-04 | 天津大学 | MMC-HVDC transient state quantity protection method capable of identifying lightning stroke interference |
| CN113917280B (en) * | 2021-09-28 | 2023-11-03 | 西安理工大学 | Lightning stroke interference and fault discrimination method for high-voltage direct-current transmission line |
| CN113917280A (en) * | 2021-09-28 | 2022-01-11 | 西安理工大学 | Method for judging lightning stroke interference and fault of high-voltage direct-current transmission line |
| CN115577259A (en) * | 2022-09-14 | 2023-01-06 | 中国南方电网有限责任公司超高压输电公司大理局 | Fault pole selection method and device for high-voltage direct-current transmission system and computer equipment |
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