CN109659915A - Traveling wave direction pilot protection method suitable for VSC-HVDC transmission line of electricity - Google Patents
Traveling wave direction pilot protection method suitable for VSC-HVDC transmission line of electricity Download PDFInfo
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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
- H02H7/265—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 making use of travelling wave theory
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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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Abstract
本发明公开了一种适用于VSC‑HVDC输电线路的行波方向纵联保护方法，包括：整流侧保护单元和逆变侧保护单元分别获取所在端的输电线路上的正、负极原始直流电压信号和正、负极高频电流行波信号；根据所在端的正极高频电流行波信号、负极高频电流行波信号及已知的故障极识别判据识别出整流侧故障极和逆变侧故障极；识别出整流侧的故障极所对应的故障方向及逆变侧的故障极所对应的故障方向；若两侧的故障方向均为正向，确定故障类型为区内故障；否则，确定故障类型为区外故障；根据确定的故障类型执行相应的保护。应用本发明，可以解决现有技术存在的故障识别可靠性差、保护容易误动的技术问题。
The invention discloses a traveling wave direction longitudinal protection method suitable for VSC-HVDC transmission lines. , Negative high frequency current traveling wave signal; identify the rectifier side fault pole and inverter side fault pole according to the positive pole high frequency current traveling wave signal, the negative pole high frequency current traveling wave signal and the known fault pole identification criteria; The fault direction corresponding to the fault pole on the rectifier side and the fault direction corresponding to the fault pole on the inverter side; if the fault directions on both sides are positive, the fault type is determined to be an area fault; otherwise, the fault type is determined to be an area fault External fault; perform corresponding protection according to the determined fault type. The application of the present invention can solve the technical problems existing in the prior art that the fault identification reliability is poor and the protection is prone to misoperation.
Description
Technical field
The invention belongs to technical field of electric power, specifically, being related to the guard method of electric system, more specifically, are
It is related to a kind of traveling wave direction pilot protection method suitable for VSC-HVDC transmission line of electricity.
Background technique
With the gradually growth of electric system scale, have the characteristics that transmission distance is long, transmission line capability is big, power transmission efficiency is high
Large capacity alternating current-direct current combined hybrid system largely build.VSC-HVDC system as a kind of voltage-source type HVDC transmission system,
Flexible power flowcontrol can be achieved, and can power to weak AC system, even passive system, commutation failure is also not present in Inverter Station
Risk, therefore, VSC-HVDC transmission system is widely applied, also will be HVDC development an important directions.
Currently, the main protection of VSC-HVDC transmission system transmission line of electricity is still based on voltage variety, voltage change using tradition
The traveling-wave protection method of rate and current changing rate.Substantially, voltage, the power frequency utilized is lower, is not stricti jurise
On traveling-wave protection method.Meanwhile existing guard method does not have direction discernment energy as a kind of Non-unit protection method yet
Power, fault identification poor reliability are easy to produce false protection, and this phenomenon is particularly evident when external area error occurs.
Summary of the invention
The object of the present invention is to provide a kind of traveling wave direction pilot protection method suitable for VSC-HVDC transmission line of electricity, solutions
Fault identification poor reliability certainly of the existing technology protects the technical issues of being easy malfunction.
For achieving the above object, the present invention, which adopts the following technical solutions, is achieved:
A kind of traveling wave direction pilot protection method suitable for VSC-HVDC transmission line of electricity, which comprises
Positive and negative electrode where rectification side protection location and inverter side protection location obtain respectively on the transmission line of electricity at end is original
D. c. voltage signal and positive and negative electrode high-frequency current travelling wave signal；
The identification of failure pole: the rectification side protection location and the inverter side protection location are respectively according to the anode at place end
High-frequency current travelling wave signal, cathode high-frequency current travelling wave signal and known failure pole identical criterion identify rectification side failure pole
With inverter side failure pole；
Fault direction identification: the rectification side protection location calculates the extremely corresponding original of the rectification side failure identified
The product of beginning DC voltage sampled value and high-frequency current traveling wave sampled value, as rectification side instantaneous power, according to the rectification side
The integrated value of instantaneous power and known fault direction criterion identify the extremely corresponding fault direction of the failure of rectification side；
The inverter side protection location calculates the extremely corresponding raw DC voltage sampled value and height of the inverter side failure identified
The product of frequency current traveling wave sampled value, as inverter side instantaneous power, according to the integrated value of the inverter side instantaneous power and
Known fault direction criterion identifies the extremely corresponding fault direction of the failure of inverter side；
Fault type recognition: if the fault direction of rectification side and the fault direction of inverter side are forward direction, failure classes are determined
Type is troubles inside the sample space；Otherwise, it determines fault type is external area error；
Corresponding protection is executed according to determining fault type.
Method as described above, the positive high-frequency current travelling wave signal according to place end, cathode high-frequency current traveling wave
Signal and known failure pole identical criterion identify pole of being out of order, and specifically include:
Calculate failure pole identification parameter P:IP, maxAnd IN, maxRespectively positive high-frequency current traveling wave
The peak value of peak value and cathode high-frequency current traveling wave；
Pole of being out of order is identified according to the fault identification parameter P and failure pole identical criterion；Failure pole identical criterion
Are as follows:
Method as described above, the rectification side protection location or the inverter side protection location calculate the failure identified
The extremely product of corresponding raw DC voltage sampled value and high-frequency current traveling wave sampled value, as instantaneous power, according to instantaneous
The integrated value of power and known fault direction criterion identify the extremely corresponding fault direction that is out of order, specifically include:
The product for calculating failure extremely corresponding raw DC voltage sampled value and high-frequency current traveling wave sampled value, as wink
When power s (n): s (n)=u (n) i (n)；N is sampled point serial number, and u (n) and i (n) are respectively the raw DC voltage of failure pole
The sampled value of sampled value and high-frequency current traveling wave at the n-th sampled point at the n-th sampled point；
Calculate the integrated value E of instantaneous power s (n):N is the length of data window；
According to the integrated value E and fault direction criterion, the extremely corresponding fault direction that is out of order is identified；The failure side
To criterion are as follows:
End where method as described above, the rectification side protection location and the inverter side protection location obtain respectively
Positive and negative electrode high-frequency current travelling wave signal on transmission line of electricity, specifically includes:
The rectification side protection location and the inverter side protection location obtain respectively where end transmission line of electricity on just,
Cathodal current travelling wave signal is filtered using positive and negative electrode current traveling wave signal of the high-pass filter to acquisition, is obtained positive and negative high
Frequency current traveling wave signal；
The high-pass filter are as follows: y (n)=0.9048y (n-1)+0.9524x (n) -0.9524x (n-1)；N is sampled point
Serial number, x (n) and x (n-1) are respectively the current traveling wave sampled signal at n-th and (n-1) sampled point, and y (n) and y (n-1) divide
Not Wei n-th and (n-1) sampled point at filter value.
Method as described above, the process of the fault type recognition specifically:
The rectification side protection location and the inverter side protection location exchange trouble direction discernment result；
Then, the rectification side protection location and the inverter side protection location execute following fault types respectively and know
It is other: if the fault direction of rectification side and the fault direction of inverter side are forward direction, to determine that fault type is troubles inside the sample space；Otherwise,
Determine that fault type is external area error.
Method as described above, it is described that corresponding protection is executed according to determining fault type, it specifically includes:
If the fault type is the troubles inside the sample space, protection location executes protection act；
If the fault type is the external area error, protection location executes protection blocking.
Compared with prior art, the advantages and positive effects of the present invention are:
(1) method of the invention is applied, it can using positive high-frequency current travelling wave signal and cathode high-frequency current travelling wave signal
To identify the failure pole of rectification side and inverter side；According to the product of the extremely corresponding instantaneous power of the failure pole identified and failure
Score value can identify the extremely corresponding fault direction that is out of order；Fault type is capable of determining that according to the fault direction of two sides, from
And troubles inside the sample space or external area error is recognized accurately, solve the problems, such as that the prior art is difficult to effectively identify fault type, and therefore
It is high to hinder identification certainty, avoids protection misoperation, improves protection reliability.
(2) in guard method proposed by the present invention, instantaneous power is utilized in a period of time window in fault direction identification
Integrated value, high reliablity are capable of providing the stability of AC-DC hybrid power grid to a certain extent.
(3) guard method proposed by the present invention is applied, two sides protection location is not necessarily to time synchronization, a large amount of without exchange
Sampled data, it is only necessary to which the data transmission pressure in exchange trouble direction, communication channel is small, and guard method is more easily implemented.
After a specific embodiment of the invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Detailed description of the invention
Fig. 1 is the traveling wave direction pilot protection method one embodiment for being suitable for VSC-HVDC transmission line of electricity based on the present invention
Flow chart；
Fig. 2 is the network architecture diagram of VSC-HVDC transmission line of electricity in Fig. 1 embodiment；
Fig. 3 be using the simulation waveform of method two sides protection location when typical troubles inside the sample space occurs of Fig. 1 embodiment,
In, (a) is positive and negative electrode raw DC voltage corrugating at the protection location of two sides, is (b) positive and negative electrode direct current at the protection location of two sides
Current traveling wave waveform (c) is positive and negative electrode high-frequency current traveling-wave waveform at the two sides protection location obtained after high-pass filtering, (d)
For positive and negative electrode instantaneous power waveform at the protection location of two sides；
Fig. 4 be using the simulation waveform of method two sides protection location when typical external area error occurs of Fig. 1 embodiment,
In, (a) is positive and negative electrode raw DC voltage corrugating at the protection location of two sides, is (b) positive and negative electrode direct current at the protection location of two sides
Current traveling wave waveform (c) is positive and negative electrode high-frequency current traveling-wave waveform at the two sides protection location obtained after high-pass filtering, (d)
For positive and negative electrode instantaneous power waveform at the protection location of two sides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below with reference to drawings and examples,
Invention is further described in detail.
It is protected referring to Fig. 1, the figure show the traveling wave direction pilot for being suitable for VSC-HVDC transmission line of electricity based on the present invention
The flow chart of maintaining method one embodiment.In conjunction with Fig. 2 shows VSC-HVDC transmission line of electricity network architecture diagram, the embodiment use
Following processes realize the traveling wave directional pilot protection of VSC-HVDC transmission line of electricity:
Step 11: where rectification side protection location and inverter side protection location obtain respectively on the transmission line of electricity at end just,
Cathode raw DC voltage signal and positive and negative electrode high-frequency current travelling wave signal.
Specifically, rectification side protection location acquires DC transmission line road by RP unit and RN unit respectively in Fig. 2
Positive raw DC voltage/anode current traveling wave signal and cathode raw DC voltage/cathodal current travelling wave signal, inverter side
Protection location acquires positive raw DC voltage/anode current traveling wave letter of DC transmission line road by IP and IN unit respectively
Number and cathode raw DC voltage/cathodal current travelling wave signal.Then, using high-pass filter to the current traveling wave signal of acquisition
Filtering, obtain rectification side positive high-frequency current travelling wave signal and cathode high-frequency current travelling wave signal and inverter side it is just high
Frequency current traveling wave signal and cathode high-frequency current travelling wave signal.High-pass filter can be realized using the prior art.As excellent
Select embodiment, high-pass filter are as follows: y (n)=0.9048y (n-1)+0.9524x (n) -0.9524x (n-1).Wherein, n is sampling
Point serial number, x (n) and x (n-1) are respectively the current traveling wave sampled signal at n-th and (n-1) sampled point, y (n) and y (n-1)
Respectively n-th and (n-1) sampled point at filter value.
Step 12: rectification side protection location and inverter side protection location execute the identification of failure pole respectively.
Specifically, rectification side protection location and inverter side protection location are respectively according to the positive high-frequency current traveling wave at place end
Signal, cathode high-frequency current travelling wave signal and failure pole identical criterion identify rectification side failure pole and inverter side failure pole.Its
In, failure pole identical criterion is known criterion, to may recognize that failure pole based on positive and negative electrode high-frequency current travelling wave signal
Criterion, the embodiment are not construed as limiting the specific algorithm of failure pole identical criterion.As a preferred embodiment, to simplify
Calculating process improves identification accuracy, rectification side protection location or inverter side protection location according to the positive high-frequency electrical at place end
Stream travelling wave signal, cathode high-frequency current travelling wave signal and known failure pole identical criterion identify pole of being out of order, and specifically include:
Calculate failure pole identification parameter P:IP, maxAnd IN, maxRespectively positive high-frequency current traveling wave
The peak value of peak value and cathode high-frequency current traveling wave；
Pole of being out of order, failure pole identical criterion are identified according to fault identification parameter family and failure pole identical criterion are as follows:
Wherein, pole pole failure refers to while including positive electrode fault and cathode failure.
Step 13: rectification side protection location and inverter side protection location are based respectively on failure pole recognition result and execute failure side
To identification.
Specifically, in this step, rectification side protection location calculates extremely corresponding original of the rectification side failure identified
The product of DC voltage sampled value and high-frequency current traveling wave sampled value, as rectification side instantaneous power, according to the instantaneous function of rectification side
The integrated value and fault direction criterion of rate identify the extremely corresponding fault direction of the failure of rectification side.For example, if step 12
Identify rectification side failure extremely positive electrode fault, then rectification side protection location will according to positive raw DC voltage sampled value and just
Extremely high frequency current traveling wave sampled value calculates rectification side anode instantaneous power, then according to the integrated value of instantaneous power and failure
Direction criterion identifies fault direction corresponding to anode；If step 12 identifies rectification side failure extremely cathode failure, whole
Stream side protection location will be calculated according to the product of cathode raw DC voltage sampled value and cathode high-frequency current traveling wave sampled value
Rectification side cathode instantaneous power, integrated value and fault direction criterion further according to instantaneous power, is identified corresponding to cathode
Fault direction.The identification of inverter side protection location fault direction is realized using the method similar with rectification side.
Wherein, fault direction criterion is known criterion, for based on high-frequency current travelling wave signal and raw DC voltage letter
The integrated value of number determining instantaneous power is that may recognize that the criterion of fault direction, the embodiment are specific to fault direction criterion
Algorithm is not construed as limiting.As a preferred embodiment, process, raising identification accuracy, rectification side are protected to simplify the calculation
It is popular that unit or inverter side protection location calculate the failure identified extremely corresponding raw DC voltage sampled value and high-frequency electrical
The product of wave sampled value is identified as instantaneous power according to the integrated value of instantaneous power and known fault direction criterion
The extremely corresponding fault direction of failure, specifically includes:
Firstly, the product of failure extremely corresponding raw DC voltage sampled value and high-frequency current traveling wave sampled value is calculated,
As instantaneous power s (n): s (n)=u (n) i (n)；N is sampled point serial number, and u (n) and i (n) are respectively the original straight of failure pole
Galvanic electricity is pressed in the sampled value of the sampled value at the n-th sampled point and high-frequency current traveling wave at the n-th sampled point；
Then, the integrated value E of instantaneous power s (n) is calculated:N is the length of data window；
Finally, identifying the extremely corresponding fault direction that is out of order according to integrated value E and fault direction criterion；Fault direction
Criterion are as follows:Instantaneous power is utilized in the integral of a period of time window in the preferred embodiment
Value, high reliablity can be improved the stability of AC-DC hybrid power grid to a certain extent.
Step 14: fault type is determined according to the fault direction of identification.
Specifically, determining that fault type is event in area if the fault direction of rectification side is identical with the fault direction of inverter side
Barrier；Otherwise, it determines fault type is external area error.Also, rectification side protection location and inverter side protection location determine each respectively
From fault type.
Specifically, rectification side protection is single after step 13 has determined rectification side fault direction and inverter side fault direction
Member and inverter side protection location exchange trouble direction discernment result.Then, rectification side protection location and inverter side protection location point
Do not judged according to the fault direction of two sides, if two fault directions are forward direction, it is determined that the fault type of the side is
Troubles inside the sample space；Otherwise, it determines the side fault type is external area error.
Step 15: corresponding protection is executed according to determining fault type.
Fault type is generally troubles inside the sample space or external area error, and every kind of failure corresponds to different Preservation tactics.If failure
Type is troubles inside the sample space, and protection location will execute protection act；If fault type is external area error, protection location will execute protection
Locking.After determining fault type, according to known corresponding relationship, protection location executes corresponding protection.
Traveling wave directional pilot protection is executed using the method for above-described embodiment, using positive high-frequency current travelling wave signal and is born
Extremely high frequency current traveling wave signal can identify the failure pole of rectification side and inverter side；According to the failure pole and failure pole identified
The integrated value of corresponding instantaneous power can identify the extremely corresponding fault direction that is out of order；According to the fault direction energy of two sides
It enough determines fault type, so that troubles inside the sample space or external area error be recognized accurately, solves the prior art and be difficult to effectively identify
The problem of fault type, and fault identification high reliablity, protection misoperation is avoided, protection reliability is improved.Moreover, using
The method of the embodiment, two sides protection location independently identify failure pole and fault direction, and nothing takes time between the protection location of two sides
It is synchronous, without a large amount of sampled data of exchange, it is only necessary to which the data transmission pressure in exchange trouble direction, communication channel is small, protection
Method is more easily implemented.
Fig. 3 be using the simulation waveform of method two sides protection location when typical troubles inside the sample space occurs of Fig. 1 embodiment,
In, (a) is positive and negative electrode raw DC voltage corrugating at the protection location of two sides, uRPAnd uRNRespectively at rectification side protection location just
Pole raw DC voltage and cathode raw DC voltage, uIPAnd uINRespectively anode raw DC voltage at inverter side protection location
Pressure and cathode raw DC voltage；It (b) is positive and negative electrode DC current traveling-wave waveform at the protection location of two sides, iRPAnd iRNRespectively
Positive DC current traveling wave waveform and negative DC current traveling wave waveform, i at rectification side protection locationIPAnd iINRespectively inversion
Positive DC current traveling wave waveform and negative DC current traveling wave waveform at the protection location of side；It (c) is to be obtained after high-pass filtering
Two sides protection location at positive and negative electrode high-frequency current traveling-wave waveform, i 'RPWith i 'RNIt is respectively just high at rectification side protection location
Frequency current traveling wave waveform and cathode high-frequency current traveling-wave waveform, i 'IPWith i 'INRespectively positive extremely high frequency at inverter side protection location
Current traveling wave waveform and cathode high-frequency current traveling-wave waveform；It (d) is positive and negative electrode instantaneous power waveform at the protection location of two sides, sRP
And sRNAnode instantaneous power waveform and cathode instantaneous power waveform, s respectively at rectification side protection locationIPAnd sINIt is respectively inverse
Become anode instantaneous power waveform and cathode instantaneous power waveform at the protection location of side.According to the method and preferred reality of Fig. 1 embodiment
The method for applying example is calculated, and the value of the failure pole identification parameter P of rectification side is 0.298, is greater than 0.1, is identified as plus earth
Failure；The value of the integrated value E of the anode of rectification side is 2.646 × 104J2, it is greater than 0, for positive failure；Therefore, the event of rectification side
Barrier is positive plus earth failure.It is computed, the value of the failure pole identification parameter P of inverter side is 0.175, is greater than 0.1, is identified as
Positive electrode fault；The value of the integrated value E of the anode of inverter side is 8.690 × 103J2, it is greater than 0, for positive failure；Therefore, inverter side
Failure be positive plus earth failure.Since the fault direction of rectification side and inverter side is forward direction, then failure classes of two sides
Type is troubles inside the sample space.
Fig. 4 be using the simulation waveform of method two sides protection location when typical external area error occurs of Fig. 1 embodiment,
In, (a) is positive and negative electrode raw DC voltage corrugating at the protection location of two sides, is (b) positive and negative electrode direct current at the protection location of two sides
Current traveling wave waveform (c) is positive and negative electrode high-frequency current traveling-wave waveform at the two sides protection location obtained after high-pass filtering, (d)
For positive and negative electrode instantaneous power waveform at the protection location of two sides.The meaning of symbol is identical as Fig. 3 in each figure.According to Fig. 1 embodiment
The method of method and preferred embodiment is calculated, and the value at the failure pole identification parameter family of rectification side is 0.740, is greater than 0.1, is known
Be not positive pole ground fault；The value of the integrated value E of the anode of rectification side is -1.859 × 103J2, it is reverse fault less than 0；Cause
This, the failure of rectification side is reversed plus earth failure.It being computed, the value at the failure pole identification parameter family of inverter side is 0.069,
Less than 0.1, it is identified as pole pole failure；The integrated value of anode and the integrated value of cathode of inverter side are respectively 9.761 × 103J2With
3.206×102J2, it is all larger than 0, thus be positive failure；Therefore, the failure of inverter side is positive pole pole failure.Due to rectification side
Fault direction be reversed, inverter side fault direction be it is positive, so the fault type of two sides is external area error.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of traveling wave direction pilot protection method suitable for VSC-HVDC transmission line of electricity, which is characterized in that the method packet
It includes:
Positive and negative electrode raw DC where rectification side protection location and inverter side protection location obtain respectively on the transmission line of electricity at end
Voltage signal and positive and negative electrode high-frequency current travelling wave signal；
The identification of failure pole: the rectification side protection location and the inverter side protection location are respectively according to the positive extremely high frequency at place end
Current traveling wave signal, cathode high-frequency current travelling wave signal and known failure pole identical criterion identify rectification side failure pole and inverse
Become side failure pole；
Fault direction identification: the rectification side protection location calculates extremely corresponding original straight of the rectification side failure identified
Galvanic electricity presses the product of sampled value and high-frequency current traveling wave sampled value, instantaneous according to the rectification side as rectification side instantaneous power
The integrated value of power and known fault direction criterion identify the extremely corresponding fault direction of the failure of rectification side；It is described
Inverter side protection location calculates the extremely corresponding raw DC voltage sampled value and high-frequency electrical of the inverter side failure identified
The product of popular wave sampled value, as inverter side instantaneous power, according to the integrated value of the inverter side instantaneous power and known
Fault direction criterion, identify the extremely corresponding fault direction of the failure of inverter side；
Fault type recognition: if the fault direction of rectification side and the fault direction of inverter side are forward direction, determine that fault type is
Troubles inside the sample space；Otherwise, it determines fault type is external area error；
Corresponding protection is executed according to determining fault type.
2. the method according to claim 1, wherein described believe according to the positive high-frequency current traveling wave at place end
Number, cathode high-frequency current travelling wave signal and the identification of known failure pole identical criterion be out of order pole, specifically include:
Calculate failure pole identification parameter P:IP, maxAnd IN, maxThe peak value of respectively positive high-frequency current traveling wave
With the peak value of cathode high-frequency current traveling wave；
Pole of being out of order is identified according to the fault identification parameter P and failure pole identical criterion；Failure pole identical criterion are as follows:
3. the method according to claim 1, wherein the rectification side protection location or inverter side protection are single
Member calculates the product of the extremely corresponding raw DC voltage sampled value and high-frequency current traveling wave sampled value of the failure identified, as
Instantaneous power identifies the extremely corresponding failure that is out of order according to the integrated value of instantaneous power and known fault direction criterion
Direction specifically includes:
The product for calculating failure extremely corresponding raw DC voltage sampled value and high-frequency current traveling wave sampled value, as instantaneous function
Rate s (n): s (n)=u (n) i (n)；N is sampled point serial number, and u (n) and i (n) are respectively that the raw DC voltage of failure pole is pressed in n-th
The sampled value of sampled value and high-frequency current traveling wave at the n-th sampled point at sampled point；
Calculate the integrated value E of instantaneous power s (n):N is the length of data window；
According to the integrated value E and fault direction criterion, the extremely corresponding fault direction that is out of order is identified；The fault direction is sentenced
According to are as follows:
4. the method according to claim 1, wherein the rectification side protection location and inverter side protection are single
Positive and negative electrode high-frequency current travelling wave signal where member obtains respectively on the transmission line of electricity at end, specifically includes:
Positive and negative electrode where the rectification side protection location and the inverter side protection location obtain respectively on the transmission line of electricity at end
Current traveling wave signal is filtered using positive and negative electrode current traveling wave signal of the high-pass filter to acquisition, obtains positive and negative electrode high-frequency electrical
Flow travelling wave signal；
The high-pass filter are as follows: y (n)=0.9048y (n-1)+0.9524x (n) -0.9524x (n-1)；N is sampled point sequence
Number, x (n) and x (n-1) they are respectively the current traveling wave sampled signal at n-th and (n-1) sampled point, and y (n) and y (n-1) are respectively
For the filter value at n-th and (n-1) sampled point.
5. method according to claim 1 to 4, which is characterized in that the process of the fault type recognition has
Body are as follows:
The rectification side protection location and the inverter side protection location exchange trouble direction discernment result；
Then, the rectification side protection location and the inverter side protection location execute following fault type recognitions respectively: if
The fault direction of rectification side and the fault direction of inverter side are forward direction, determine that fault type is troubles inside the sample space；Otherwise, it determines therefore
Barrier type is external area error.
6. method according to claim 1 to 4, which is characterized in that described to be held according to determining fault type
The corresponding protection of row, specifically includes:
If the fault type is the troubles inside the sample space, protection location executes protection act；
If the fault type is the external area error, protection location executes protection blocking.
Priority Applications (1)
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| CN110954786A (en) * | 2019-12-25 | 2020-04-03 | 青岛科技大学 | Hybrid multi-terminal direct current transmission line traveling wave distance measurement method based on HHT |
| CN111308267A (en) * | 2019-12-25 | 2020-06-19 | 青岛科技大学 | A traveling wave ranging method for hybrid multi-terminal DC transmission lines based on C-EVT |
| CN113972632A (en) * | 2021-10-09 | 2022-01-25 | 华中科技大学 | Direct current line pilot direction protection method, device and system |
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| CN105548819A (en) * | 2016-02-19 | 2016-05-04 | 国网四川省电力公司电力科学研究院 | High-voltage direct current transmission line internal fault and external fault identification method based on backward traveling waves |
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| CN105548819A (en) * | 2016-02-19 | 2016-05-04 | 国网四川省电力公司电力科学研究院 | High-voltage direct current transmission line internal fault and external fault identification method based on backward traveling waves |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110954786A (en) * | 2019-12-25 | 2020-04-03 | 青岛科技大学 | Hybrid multi-terminal direct current transmission line traveling wave distance measurement method based on HHT |
| CN111308267A (en) * | 2019-12-25 | 2020-06-19 | 青岛科技大学 | A traveling wave ranging method for hybrid multi-terminal DC transmission lines based on C-EVT |
| CN113972632A (en) * | 2021-10-09 | 2022-01-25 | 华中科技大学 | Direct current line pilot direction protection method, device and system |
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