CN106526422A - Method for processing fault traveling wave of flexible DC transmission line - Google Patents
Method for processing fault traveling wave of flexible DC transmission line Download PDFInfo
- Publication number
- CN106526422A CN106526422A CN201610996242.XA CN201610996242A CN106526422A CN 106526422 A CN106526422 A CN 106526422A CN 201610996242 A CN201610996242 A CN 201610996242A CN 106526422 A CN106526422 A CN 106526422A
- Authority
- CN
- China
- Prior art keywords
- pole
- travelling wave
- pole mould
- flexible
- wave
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The invention provides a method for processing the fault traveling wave of a flexible DC transmission line. The method comprises a step of obtaining the pole mode current and pole mode voltage fault transient traveling wave of the flexible DC transmission line, a step of obtaining a pole mode reverse voltage fault transient traveling wave, a step of obtaining the modulus maximum of the pole mode reverse voltage fault transient traveling wave, and obtaining the equivalent pole mode inverse voltage travelling wave of the pole mode reverse voltage fault transient traveling wave. According to the technical scheme of the invention, the difference between the fault traveling wave and high-frequency transient interference can be effectively displayed, thus the overall characteristic of a flexible DC transmission line fault is more simple and intuitive, the influences of direct current and low frequency signal in the pole mode reverse voltage fault transient traveling wave can be eliminated, the high frequency characteristic of a traveling wave process is highlighted, the analysis difficulty of a flexible DC system downgoing wave process is reduced, and the ultra high speed flexible DC transmission line protection is possible.
Description
Technical field
The present invention relates to relay protection of power system and fault detection technique field, in particular to a kind of flexible straight
The processing method of stream transmission line malfunction traveling wave.
Background technology
Technology of HVDC based Voltage Source Converter compared to Traditional DC technology of transmission of electricity, with harmonics level is low, no commutation failure is asked
Topic, no reactive-load compensation problem, can power for passive system, can be while independent regulation active power and reactive power etc. be excellent
Point, has broad application prospects in China.But flexible DC power transmission circuit is short-circuited during failure, excessive short circuit current
The power electronic devices of meeting permanent damages current conversion station, it is therefore desirable to the correct identification failure in the extremely short time after failure occurs,
Cut-off dc circuit breaker to protect the power electronic devices of current conversion station.The relay protection of Traditional DC transmission line of electricity can not meet soft
Property DC power transmission line to protect rapidity requirement, the resist technology and failover technique based on traveling wave principle be solve this ask
The ideal chose of topic.
But, the analysis method of current fault traveling wave lacks to whole ripple with single fault traveling wave wave head as object of study
The in-depth analysis of process feature；And only by single fault traveling wave wave head, the global feature of fault traveling wave is difficult succinct and has
Highlight to effect, it is difficult to distinguish fault traveling wave and high frequency transient interference.Therefore the fault traveling wave with wave process as object is processed
Method, it is significant to recognizing fault traveling wave and raising traveling-wave protection reliability.
The content of the invention
It is contemplated that at least solving one of technical problem present in prior art or correlation technique.
For this purpose, it is an object of the present invention to proposing a kind of process side of flexible DC power transmission line fault traveling wave
Method.
For achieving the above object, a kind of embodiments in accordance with the present invention, it is proposed that flexible DC power transmission line fault traveling wave
Processing method, including：The pole mould current failure transient state travelling wave and pole mode voltage failure of flexible DC power transmission circuit are obtained respectively
Transient state travelling wave；Obtain the pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit；Obtain the pole mould backward voltage
The modulus maximum of fault transient travelling wave, is calculated the equivalent pole mould backward voltage of the pole mould backward voltage fault transient travelling wave
Traveling wave.
The processing method of flexible DC power transmission line fault traveling wave, flexible straight by obtaining according to an embodiment of the invention
The pole mould backward voltage failure that the pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave of stream transmission line of electricity is obtained
Transient state travelling wave, and by obtaining the modulus maximum of pole mould backward voltage fault transient travelling wave, obtain equivalent pole mould backward voltage
Technical scheme as traveling wave, can eliminate the impact of direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole, make
Obtain ultrahigh speed flexible DC power transmission route protection to be possibly realized.
According to one embodiment of present invention, the pole mould current failure transient state travelling wave of flexible DC power transmission circuit is obtained respectively
Can specifically include with pole mode voltage fault transient travelling wave：It is when flexible DC power transmission line failure, defeated to flexible direct current
The electric current of electric line is sampled and poke；To the positive pole electric current i in the current sample value sequencep(n) and cathodal current in
N the sampled value of () carries out pole modular transformation, the positive pole electric current and cathodal current decoupling that there will be electromagnetic coupled relation is independent zero
Mould current failure transient state travelling wave i0(n) and pole mould current failure transient state travelling wave i1(n)；To in the voltage sample value sequence just
Pole tension up(n) and cathode voltage unN the sampled value of () carries out pole modular transformation, there will be electromagnetic coupled relation cathode voltage and
Cathode voltage decoupling is zero independent mode voltage fault transient travelling wave u0(n) and pole mode voltage fault transient travelling wave u1(n)。
In this embodiment, the pole mould current failure transient state travelling wave and pole mode voltage failure of flexible DC power transmission circuit are obtained
The mode of transient state travelling wave is specially by the electric current to flexible DC power transmission circuit during flexible DC power transmission line fault
Sampled result carries out pole moding and brings what is carried out, has been converted to zero independent mould current failure transient state travelling wave i by pole mould0
(n) and pole mould current failure transient state travelling wave i1(n), and zero independent mode voltage fault transient travelling wave u0The event of (n) and pole mode voltage
Barrier transient state travelling wave u1(n)。
According to one embodiment of present invention, obtain the pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit
Specifically include：Using the inductance L of the pole mould unit length of the flexible DC power transmission circuitlWith the electric capacity C of pole mould unit length1,
Ask for pole mould natural impedance Zc1；Using the pole mould current failure transient state travelling wave i1(n), the pole mode voltage fault transient travelling wave u1
(n) and pole mould natural impedance Zc1, ask for the pole mould backward voltage fault transient travelling wave ur1(n)。
In this embodiment, by the inductance L of the pole mould unit length of flexible DC power transmission circuitlWith pole mould unit length
Electric capacity C1, obtained pole mould natural impedance Zc1, then pass through pole mould natural impedance Z againc1, obtain pole mould backward voltage fault transient row
Ripple ur1(n)。
According to one embodiment of present invention, the modulus maximum of pole mould backward voltage fault transient travelling wave is obtained, pole is obtained
The equivalent pole mould backward voltage traveling wave of mould backward voltage fault transient travelling wave is specifically included：The pole mould backward voltage fault transient
Traveling wave ur1N () carries out wavelet transformation, obtain corresponding wavelet conversion coefficient；The modulus maxima of the wavelet conversion coefficient is asked for respectively
Value；Singularity identification is carried out to the modulus maximum of the wavelet conversion coefficient, Lipschitz exponent, cancelling noise interference is calculated；
Eliminate interference of the continuous signal discretization to the modulus maximum of the wavelet conversion coefficient；Will be the pole mould backward voltage failure temporary
State traveling wave the wavelet conversion coefficient of everywhere modulus maximum with this at impulse function expressed, the impulse letter
Several amplitudes is equal with the modulus maximum of the wavelet conversion coefficient at this, the impulse function sequence that the impulse function is constituted
As the equivalent pole mould backward voltage traveling wave.
In this embodiment, by carrying out wavelet transformation to pole mould backward voltage fault transient travelling wave, and to wavelet transformation
The modulus maximum of coefficient carries out the process of singularity identification, eliminates noise jamming.Then, by eliminating continuous signal discretization
Interference to the modulus maximum of wavelet conversion coefficient, pole mould backward voltage fault transient travelling wave is converted to by impulse function sequence
The equivalent pole mould backward voltage traveling wave for representing, can eliminate direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole
Affect, highlight the high frequency characteristics of traveling wave wave process.
According to one embodiment of present invention, wavelet transformation adopts the derived function of three subcenter B-spline functions as small echo
Function, wavelet coefficient sequences hk?k∈z, gk?k∈zFor：
Hk?k∈z=(0.125,0.375,0.375,0.125) (k=-1,0,1,2),
Gk?k∈z=(- 2,2) (k=0,1),
After wavelet transformation, pole mould backward voltage fault transient travelling wave is resolved into into following form：
Wherein,For the pole mould backward voltage fault transient travelling wave ur1The wavelets approximation coefficient of (n),For the pole mould backward voltage fault transient travelling wave ur1The wavelet conversion coefficient of (n).
In this embodiment, wavelet transformation adopts the derived function of three subcenter B-spline functions as wavelet function, Neng Gouyou
The wavelet conversion coefficient for characterizing pole mould backward voltage fault transient travelling wave characteristic is extracted effect.
According to one embodiment of present invention, the modulus maximum of wavelet conversion coefficient is：For any given positive number ε>
0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, haveSet up, wherein, n0It is reversely electric for pole mould
The sampling sequence number of pressure fault transient travelling wave,It is pole mould backward voltage fault transient travelling wave in sampling sequence number n0That what is located is little
The modulus maximum of wave conversion coefficient, yardsticks of the j for wavelet transformation.
In this embodiment, can be reversely electric in reservation pole mould as far as possible by asking for the modulus maximum of wavelet conversion coefficient
Noise reduction process is carried out to pole mould backward voltage fault transient travelling wave on the premise of pressure fault transient travelling wave characteristic.
According to one embodiment of present invention, Lipschitz exponent is：
Wherein, α is Lipschitz exponent, n0For the sampling sequence number of pole mould backward voltage fault transient travelling wave,For
The modulus maximum of the wavelet conversion coefficient at the sampling sequence number, yardsticks of the j for wavelet transformation；Work as α<Mould when 0, at sampling sequence number
Maximum is noise jamming, weeds out the modulus maximum at sampling sequence number.
In this embodiment, can be to the sampling sequence number of pole mould backward voltage fault transient travelling wave by Lipschitz exponent
Place carries out rejecting process by the modulus maximum formed by noise jamming.
According to one embodiment of present invention, also include：Modulus maximum of the maximum modulus maximum below 10% is defined as
Interference of the continuous signal discretization to the modulus maximum, and reject the interference.
In this embodiment, further pointed out by rejecting maximum modulus maximum of the modulus maximum below 10% to reduce
Interference of the continuous signal discretization to modulus maximum.
According to a further aspect in the invention, it is also proposed that a kind of processing meanss of flexible DC power transmission line fault traveling wave,
Including：Pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave acquiring unit, obtain flexible DC power transmission circuit
Pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave；Pole mould backward voltage fault transient travelling wave obtains single
Unit, for obtaining the pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit；And computing unit, for obtaining
State the modulus maximum of pole mould backward voltage fault transient travelling wave, be calculated the pole mould backward voltage fault transient travelling wave etc.
Effect pole mould backward voltage traveling wave.
The processing meanss of flexible DC power transmission line fault traveling wave, flexible straight by obtaining according to an embodiment of the invention
The pole mould backward voltage failure that the pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave of stream transmission line of electricity is obtained
Transient state travelling wave, and by obtaining the modulus maximum of pole mould backward voltage fault transient travelling wave, obtain equivalent pole mould backward voltage
Technical scheme as traveling wave, can eliminate the impact of direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole, make
Obtain ultrahigh speed flexible DC power transmission route protection to be possibly realized.
According to another embodiment of the present invention, pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave are obtained
Unit is specifically included：
Sampling unit, in the flexible DC power transmission line failure, with predetermined sampling rate to the flexible direct current
The electric current and voltage of transmission line of electricity is sampled and poke, obtains current sample value sequence or voltage sample value sequence；
Pole modular transformation unit, for the positive pole electric current i in the current sample value sequencep(n) and cathodal current in(n)
Sampled value carry out pole modular transformation, the positive pole electric current and cathodal current decoupling that there will be electromagnetic coupled relation is independent zero mould electricity
Stream fault transient travelling wave i0(n) and pole mould current failure transient state travelling wave i1(n)；And in the voltage sample value sequence just
Pole tension up(n) and cathode voltage unN the sampled value of () carries out pole modular transformation, there will be electromagnetic coupled relation cathode voltage and
Cathode voltage decoupling is zero independent mode voltage fault transient travelling wave u0(n) and pole mode voltage fault transient travelling wave u1(n)。
In this embodiment, the pole mould current failure transient state travelling wave and pole mode voltage failure of flexible DC power transmission circuit are obtained
The mode of transient state travelling wave is specially by the electric current to flexible DC power transmission circuit during flexible DC power transmission line fault
Sampled result carries out pole moding and brings what is carried out, has been converted to zero independent mould current failure transient state travelling wave i by pole mould0
(n) and pole mould current failure transient state travelling wave i1(n), and zero independent mode voltage fault transient travelling wave u0The event of (n) and pole mode voltage
Barrier transient state travelling wave u1(n)。
According to one embodiment of present invention, pole mould backward voltage fault transient travelling wave acquiring unit specifically for：Utilize
The inductance L of the pole mould unit length of the flexible DC power transmission circuitlWith the electric capacity C of pole mould unit length1, ask for pole mould wave resistance
Anti- Zc1；Using the pole mould current failure transient state travelling wave i1(n), the pole mode voltage fault transient travelling wave u1(n) and the pole
Mould natural impedance Zc1, ask for the pole mould backward voltage fault transient travelling wave ur1(n)。
In this embodiment, by the inductance L of the pole mould unit length of flexible DC power transmission circuitlWith pole mould unit length
Electric capacity C1, obtained pole mould natural impedance Zc1, then pass through pole mould natural impedance Z againc1, obtain pole mould backward voltage fault transient row
Ripple ur1(n)。
According to one embodiment of present invention, computing unit specifically for：To the pole mould backward voltage fault transient row
Ripple ur1N () carries out wavelet transformation, obtain corresponding wavelet conversion coefficient；The modulus maxima of the wavelet conversion coefficient is asked for respectively
Value；Singularity identification is carried out to the modulus maximum of the wavelet conversion coefficient, Lipschitz exponent, cancelling noise interference is calculated；
Eliminate interference of the continuous signal discretization to the modulus maximum of the wavelet conversion coefficient；Will be the pole mould backward voltage failure temporary
State traveling wave the wavelet conversion coefficient of everywhere modulus maximum with this at impulse function expressed, the impulse letter
Several amplitudes is equal with the modulus maximum of the wavelet conversion coefficient at this, the impulse function sequence that the impulse function is constituted
As the equivalent pole mould backward voltage traveling wave.
In this embodiment, by carrying out wavelet transformation to pole mould backward voltage fault transient travelling wave, and to wavelet transformation
The modulus maximum of coefficient carries out the process of singularity identification, eliminates noise jamming.Then, by eliminating continuous signal discretization
Interference to the modulus maximum of wavelet conversion coefficient, pole mould backward voltage fault transient travelling wave is converted to by impulse function sequence
The equivalent pole mould backward voltage traveling wave for representing, can eliminate direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole
Affect, highlight the high frequency characteristics of traveling wave wave process.
According to one embodiment of present invention, derived function conduct of the wavelet transformation using three subcenter B-spline functions
Wavelet function, wavelet coefficient sequences hk?k∈z, gk?k∈zFor：
Hk?k∈z=(0.125,0.375,0.375,0.125) (k=-1,0,1,2),
Gk?k∈z=(- 2,2) (k=0,1),
After the wavelet transformation, the pole mould backward voltage fault transient travelling wave is resolved into into following form：
Wherein,For the pole mould backward voltage fault transient travelling wave ur1The wavelets approximation coefficient of (n),For the pole mould backward voltage fault transient travelling wave ur1The wavelet conversion coefficient of (n).
In this embodiment, wavelet transformation adopts the derived function of three subcenter B-spline functions as wavelet function, Neng Gouyou
The wavelet conversion coefficient for characterizing pole mould backward voltage fault transient travelling wave characteristic is extracted effect.
According to one embodiment of present invention, the modulus maximum of wavelet conversion coefficient is：For any given positive number ε>
0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, haveSet up, wherein, n0It is reversely electric for pole mould
The sampling sequence number of pressure fault transient travelling wave,It is pole mould backward voltage fault transient travelling wave in sampling sequence number n0That what is located is little
The modulus maximum of wave conversion coefficient, yardsticks of the j for wavelet transformation.
According to one embodiment of present invention, the modulus maximum of wavelet conversion coefficient is：
For any given positive number ε>0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, haveSet up,
Wherein, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,It is anti-for the pole mould
To voltage failure transient state travelling wave in sampling sequence number n0The modulus maximum of the wavelet conversion coefficient at place, chis of the j for wavelet transformation
Degree.
In this embodiment, can be reversely electric in reservation pole mould as far as possible by asking for the modulus maximum of wavelet conversion coefficient
Noise reduction process is carried out to pole mould backward voltage fault transient travelling wave on the premise of pressure fault transient travelling wave characteristic.
According to one embodiment of present invention, Lipschitz exponent is：
Wherein, α is Lipschitz exponent, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,It is the modulus maximum of the wavelet conversion coefficient at the sampling sequence number, j is the yardstick of wavelet transformation；Work as α<When 0,
Modulus maximum at the sampling sequence number is the noise jamming, and the modulus maximum at the sampling sequence number is rejected.
In this embodiment, can be to the sampling sequence number of pole mould backward voltage fault transient travelling wave by Lipschitz exponent
Place carries out rejecting process by the modulus maximum formed by noise jamming.
According to one embodiment of present invention, computing unit is true for the modulus maximum by maximum modulus maximum below 10%
It is set to interference of the continuous signal discretization to the modulus maximum, and rejects the interference.
In this embodiment, further pointed out by rejecting maximum modulus maximum of the modulus maximum below 10% to reduce
Interference of the continuous signal discretization to modulus maximum.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
Fig. 1 shows the processing method of flexible DC power transmission line fault traveling wave according to an embodiment of the invention
Schematic flow diagram；
Fig. 2 shows a kind of schematic flow diagram of embodiment of the processing procedure of step 102 in the embodiment in Fig. 1；
Fig. 3 shows a kind of schematic flow diagram of embodiment of the processing procedure of step 104 in the embodiment in Fig. 1；
Fig. 4 shows a kind of schematic flow diagram of embodiment of the processing procedure of step 106 in the embodiment in Fig. 1；
Fig. 5 shows the processing meanss of flexible DC power transmission line fault traveling wave according to an embodiment of the invention
Schematic diagram.
Specific embodiment
It is in order to be more clearly understood that the above objects, features and advantages of the present invention, below in conjunction with the accompanying drawings and concrete real
Apply mode to be further described in detail the present invention.It should be noted that in the case where not conflicting, the enforcement of the application
Feature in example and embodiment can be mutually combined.
Many details are elaborated in the following description in order to fully understand the present invention, but, the present invention may be used also
Implemented with being different from other modes described here using other, therefore, protection scope of the present invention is not by described below
Specific embodiment restriction.
As shown in figure 1, according to one embodiment of present invention there is provided a kind of flexible DC power transmission line fault traveling wave
Processing method, including：Step 102, obtains the pole mould current failure transient state travelling wave and pole mould electricity of flexible DC power transmission circuit respectively
Pressure fault transient travelling wave；Step 104, obtains the pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit；Step
106, the modulus maximum of the pole mould backward voltage fault transient travelling wave is obtained, the pole mould backward voltage failure is calculated temporary
The equivalent pole mould backward voltage traveling wave of state traveling wave.
In above-described embodiment, the processing method of flexible DC power transmission line fault traveling wave, by obtaining flexible DC power transmission
The pole mould backward voltage fault transient row that the pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave of circuit is obtained
Ripple, can effectively show the difference of fault traveling wave and high frequency transient interference, make the entirety of flexible DC power transmission line fault
Feature is more succinct and directly perceived.And pass through to obtain the modulus maximum of pole mould backward voltage fault transient travelling wave, the equivalent pole for obtaining
Mould backward voltage traveling wave, can eliminate the impact of direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole, highlight
The high frequency characteristics of traveling wave wave process, reduces the analysis difficulty to flexible direct current system down going wave wave process so that ultrahigh speed is soft
Property protection of direct current supply line is possibly realized.
In the above embodiment, it is preferable that in FIG the step of 102 include, it is as shown in Figure 2：Step 202, when soft
Property DC power transmission line when breaking down, the electric current (or voltage) to flexible DC power transmission circuit is sampled and poke, sampling
Rate is 1MHz, obtains the sampled value sequence of electric current (or voltage)；Step 204, to bipolar current value i for being gatheredp(n), in(n)
(or magnitude of voltage up(n), un(n)) carry out pole modular transformation, there will be electromagnetic coupled relation positive pole and cathodal current (or positive pole and
Cathode voltage) decouple as zero independent mould current failure transient state travelling wave i0(n) and pole mould current failure transient state travelling wave i1(n) and
Zero mode voltage fault transient travelling wave u0(n) and pole mode voltage fault transient travelling wave u1(n))。
In this embodiment, when flexible DC power transmission line failure, electric current in flexible DC power transmission circuit or
The waveform of person's voltage can be undergone mutation, now it is difficult to directly by electric current or voltage whether judging flexible DC power transmission circuit
Break down.And to the positive and negative electrode electric current with electromagnetic coupled relation in the electric current or voltage after sampling or positive and negative electrode electricity
Pressure carries out pole modular transformation, then can obtain being easy to analyzing the pole mould current failure transient state travelling wave of flexible DC power transmission line fault and
Pole mode voltage fault transient travelling wave.
In the above embodiment, it is preferable that in FIG the step of 104 include that step 302 as shown in Figure 3 is utilized
The inductance L of flexible DC power transmission circuit pole mould unit lengthlWith the electric capacity C of pole mould unit length1, ask for pole mould natural impedance Zc1；
Step 304, using pole mould current failure transient state travelling wave i1(n), pole mode voltage fault transient travelling wave u1(n) and pole mould natural impedance
Zc1, ask for pole mould backward voltage fault transient travelling wave ur1(n)。
In the above embodiment, it is preferable that in step 302, pole mould natural impedance Zc1For：
Wherein, LlFor the inductance of flexible DC power transmission circuit pole mould unit length, C1For flexible DC power transmission circuit pole mould list
The electric capacity of bit length.
In the above embodiment, it is preferable that in step 304, pole mould backward voltage fault transient travelling wave ur1N () is：
ur1(n)=u1(n)-Zc1i1(n)
Wherein, u1N () is pole mode voltage fault transient travelling wave；i1N () is pole mould current failure transient state travelling wave；Zc1For pole mould
Natural impedance.
In this embodiment, particularly illustrate and can pass through to obtain electric parameter (the pole mould in flexible DC power transmission circuit
The inductance of unit length, the electric capacity of pole mould unit length and pole mould natural impedance) and with reference to the electricity in flexible DC power transmission circuit
Gas parameter (pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave) is asking for pole mould backward voltage fault transient
Traveling wave.
In the above embodiment, it is preferable that in FIG the step of 106 include, step 402 as shown in Figure 4, to pole
Mould backward voltage fault transient travelling wave ur1N () carries out wavelet transformation, try to achieve corresponding wavelet conversion coefficient；Step 404, is asked respectively
Take the modulus maximum of wavelet conversion coefficient；Step 406, carries out singularity identification to the modulus maximum of wavelet conversion coefficient, calculates
Lipschitz (Li Puxizi) index, cancelling noise interference；Step 408, eliminates continuous signal discretization to wavelet conversion coefficient
Modulus maximum interference；Step 410, by pole mould backward voltage fault transient travelling wave the wavelet conversion coefficient of everywhere mould
Maximum is expressed with the impulse function at this, the amplitude of impulse function with this at wavelet conversion coefficient modulus maximum phase
Deng the impulse function sequence that impulse function is constituted as equivalent pole mould backward voltage traveling wave.
In this embodiment, by carrying out wavelet transformation by pole mould backward voltage to pole mould backward voltage fault transient travelling wave
Fault transient travelling wave is converted to the equivalent pole mould backward voltage traveling wave represented by impulse function sequence.Pole mould can be eliminated reversely electric
In pressure fault transient travelling wave, the impact of direct current and low frequency signal, highlights the high frequency characteristics of traveling wave wave process.
In the above embodiment, it is preferable that in step 402, wavelet transformation leads letter using three subcenter B-spline functions
Number is used as wavelet function, wavelet coefficient sequences hk?k∈z, gk?k∈zFor：
Hk?k∈z=(0.125,0.375,0.375,0.125) (k=-1,0,1,2),
Gk?k∈z=(- 2,2) (k=0,1),
After wavelet transformation, by pole mould backward voltage fault transient travelling wave ur1N () resolves into following form：
Wherein,For pole mould backward voltage fault transient travelling wave ur1The wavelets approximation coefficient of (n),For
Pole mould backward voltage fault transient travelling wave ur1The wavelet conversion coefficient of (n).
In this embodiment, wavelet transformation adopts the derived function of three subcenter B-spline functions as wavelet function, Neng Gouyou
The wavelet conversion coefficient for characterizing pole mould backward voltage fault transient travelling wave characteristic is extracted effect.
In the above embodiment, it is preferable that in step 404, the modulus maximum of wavelet conversion coefficient is：
For any given positive number ε>0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, haveSet up,Referred to as pole mould backward voltage fault transient travelling wave ur1N () is in sampling sequence number
n0The modulus maximum of the wavelet conversion coefficient at place, yardsticks of the j for wavelet transformation.
In this embodiment, can be reversely electric in reservation pole mould as far as possible by asking for the modulus maximum of wavelet conversion coefficient
Noise reduction process is carried out to pole mould backward voltage fault transient travelling wave on the premise of pressure fault transient travelling wave characteristic.
In the above embodiment, it is preferable that in a step 406, Lipschitz indexes are：
WhereinIt is in sampling sequence number n0The modulus maximum of the wavelet conversion coefficient at place, chis of the j for wavelet transformation
Degree；
Work as α<When 0, sampling sequence number n0The modulus maximum at place is noise jamming, weeds out sampling sequence number n0The modulus maximum at place.
In this embodiment, can be to the sampling sequence number of pole mould backward voltage fault transient travelling wave by Lipschitz exponent
Place carries out rejecting process by the modulus maximum formed by noise jamming.
In the above embodiment, it is preferable that in a step 408, modulus maximum of the maximum modulus maximum below 10% is company
Interference of the continuous signal discrete to modulus maximum, needs to reject.
In this embodiment, further pointed out by rejecting maximum modulus maximum of the modulus maximum below 10% to reduce
Interference of the continuous signal discretization to modulus maximum.
Fig. 5 shows the processing meanss of flexible DC power transmission line fault traveling wave according to an embodiment of the invention
Schematic diagram.
As shown in figure 5, the processing meanss of flexible DC power transmission line fault traveling wave according to an embodiment of the invention
500 include：
Pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave acquiring unit 502, obtain flexible direct current defeated
The pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave of electric line；Pole mould backward voltage fault transient travelling wave is obtained
Unit 504 is taken, for obtaining the pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit；And computing unit 506,
For obtaining the modulus maximum of the pole mould backward voltage fault transient travelling wave, the pole mould backward voltage failure is calculated temporary
The equivalent pole mould backward voltage traveling wave of state traveling wave.
The processing meanss of flexible DC power transmission line fault traveling wave, flexible straight by obtaining according to an embodiment of the invention
The pole mould backward voltage failure that the pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave of stream transmission line of electricity is obtained
Transient state travelling wave, and by obtaining the modulus maximum of pole mould backward voltage fault transient travelling wave, obtain equivalent pole mould backward voltage
Technical scheme as traveling wave, can eliminate the impact of direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole, make
Obtain ultrahigh speed flexible DC power transmission route protection to be possibly realized.
According to one embodiment of present invention, pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave are obtained
Unit 502 can include：
Sampling unit 5022, in the flexible DC power transmission line failure, with predetermined sampling rate to the flexibility
The electric current and voltage of DC power transmission line is sampled and poke, obtains current sample value sequence or voltage sample value sequence；
Pole modular transformation unit 5024, for the positive pole electric current i in the current sample value sequencep(n) and cathodal current in
N the sampled value of () carries out pole modular transformation, the positive pole electric current and cathodal current decoupling that there will be electromagnetic coupled relation is independent zero
Mould current failure transient state travelling wave i0(n) and pole mould current failure transient state travelling wave i1(n)；And in the voltage sample value sequence
Cathode voltage up(n) and cathode voltage unN the sampled value of () carries out pole modular transformation, the positive electrical that there will be electromagnetic coupled relation
Pressure and cathode voltage decoupling are zero independent mode voltage fault transient travelling wave u0(n) and pole mode voltage fault transient travelling wave u1(n)。
In this embodiment, the pole mould current failure transient state travelling wave and pole mode voltage failure of flexible DC power transmission circuit are obtained
The mode of transient state travelling wave is specially by the electric current to flexible DC power transmission circuit during flexible DC power transmission line fault
Sampled result carries out pole moding and brings what is carried out, has been converted to zero independent mould current failure transient state travelling wave i by pole mould0
(n) and pole mould current failure transient state travelling wave i1(n), and zero independent mode voltage fault transient travelling wave u0The event of (n) and pole mode voltage
Barrier transient state travelling wave u1(n)。
According to one embodiment of present invention, pole mould backward voltage fault transient travelling wave acquiring unit specifically for：Utilize
The inductance L of the pole mould unit length of the flexible DC power transmission circuitlWith the electric capacity C of pole mould unit length1, ask for pole mould wave resistance
Anti- Zc1；Using the pole mould current failure transient state travelling wave i1(n), the pole mode voltage fault transient travelling wave u1(n) and the pole
Mould natural impedance Zc1, ask for the pole mould backward voltage fault transient travelling wave ur1(n)。
In this embodiment, by the inductance L of the pole mould unit length of flexible DC power transmission circuitlWith pole mould unit length
Electric capacity C1, obtained pole mould natural impedance Zc1, then pass through pole mould natural impedance Z againc1, obtain pole mould backward voltage fault transient row
Ripple ur1(n)。
According to one embodiment of present invention, computing unit 506 specifically for：To the pole mould backward voltage fault transient
Traveling wave ur1N () carries out wavelet transformation, obtain corresponding wavelet conversion coefficient；The modulus maxima of the wavelet conversion coefficient is asked for respectively
Value；Singularity identification is carried out to the modulus maximum of the wavelet conversion coefficient, Lipschitz exponent, cancelling noise interference is calculated；
Eliminate interference of the continuous signal discretization to the modulus maximum of the wavelet conversion coefficient；Will be the pole mould backward voltage failure temporary
State traveling wave the wavelet conversion coefficient of everywhere modulus maximum with this at impulse function expressed, the impulse letter
Several amplitudes is equal with the modulus maximum of the wavelet conversion coefficient at this, the impulse function sequence that the impulse function is constituted
As the equivalent pole mould backward voltage traveling wave.
In this embodiment, by carrying out wavelet transformation to pole mould backward voltage fault transient travelling wave, and to wavelet transformation
The modulus maximum of coefficient carries out the process of singularity identification, eliminates noise jamming.Then, by eliminating continuous signal discretization
Interference to the modulus maximum of wavelet conversion coefficient, pole mould backward voltage fault transient travelling wave is converted to by impulse function sequence
The equivalent pole mould backward voltage traveling wave for representing, can eliminate direct current and low frequency signal in the mould backward voltage fault transient travelling wave of pole
Affect, highlight the high frequency characteristics of traveling wave wave process.
According to one embodiment of present invention, derived function conduct of the wavelet transformation using three subcenter B-spline functions
Wavelet function, wavelet coefficient sequences hk?k∈z, gk?k∈zFor：
Hk?k∈z=(0.125,0.375,0.375,0.125) (k=-1,0,1,2),
Gk?k∈z=(- 2,2) (k=0,1),
After the wavelet transformation, the pole mould backward voltage fault transient travelling wave is resolved into into following form：
Wherein,For the pole mould backward voltage fault transient travelling wave ur1The wavelets approximation coefficient of (n),For the pole mould backward voltage fault transient travelling wave ur1The wavelet conversion coefficient of (n).
In this embodiment, wavelet transformation adopts the derived function of three subcenter B-spline functions as wavelet function, Neng Gouyou
The wavelet conversion coefficient for characterizing pole mould backward voltage fault transient travelling wave characteristic is extracted effect.
According to one embodiment of present invention, the modulus maximum of wavelet conversion coefficient is：For any given positive number ε>
0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, haveSet up, wherein, n0It is reversely electric for pole mould
The sampling sequence number of pressure fault transient travelling wave,It is pole mould backward voltage fault transient travelling wave in sampling sequence number n0That what is located is little
The modulus maximum of wave conversion coefficient, yardsticks of the j for wavelet transformation.
According to one embodiment of present invention, the modulus maximum of wavelet conversion coefficient is：
For any given positive number ε>0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, haveSet up,
Wherein, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,It is anti-for the pole mould
To voltage failure transient state travelling wave in sampling sequence number n0The modulus maximum of the wavelet conversion coefficient at place, chis of the j for wavelet transformation
Degree.
In this embodiment, can be reversely electric in reservation pole mould as far as possible by asking for the modulus maximum of wavelet conversion coefficient
Noise reduction process is carried out to pole mould backward voltage fault transient travelling wave on the premise of pressure fault transient travelling wave characteristic.
According to one embodiment of present invention, Lipschitz exponent is：
Wherein, α is Lipschitz exponent, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,It is the modulus maximum of the wavelet conversion coefficient at the sampling sequence number, j is the yardstick of wavelet transformation；Work as α<When 0,
Modulus maximum at the sampling sequence number is the noise jamming, and the modulus maximum at the sampling sequence number is rejected.
In this embodiment, can be to the sampling sequence number of pole mould backward voltage fault transient travelling wave by Lipschitz exponent
Place carries out rejecting process by the modulus maximum formed by noise jamming.
According to one embodiment of present invention, computing unit is true for the modulus maximum by maximum modulus maximum below 10%
It is set to interference of the continuous signal discretization to the modulus maximum, and rejects the interference.
In this embodiment, further pointed out by rejecting maximum modulus maximum of the modulus maximum below 10% to reduce
Interference of the continuous signal discretization to modulus maximum.
Technical scheme is described in detail above in association with accompanying drawing, it is defeated that the present invention proposes a kind of new flexible direct current
The processing method of line fault traveling wave, by the pole mould current failure transient state travelling wave and pole mould that obtain flexible DC power transmission circuit
The pole mould backward voltage fault transient travelling wave that voltage failure transient state travelling wave is obtained, can effectively show fault traveling wave and high frequency
The difference of transient interference, makes the global feature of flexible DC power transmission line fault more succinct and directly perceived.
The preferred embodiments of the present invention are these are only, the present invention is not limited to, for those skilled in the art
For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made,
Equivalent, improvement etc., should be included within the scope of the present invention.
Claims (16)
1. a kind of processing method of flexible DC power transmission line fault traveling wave, it is characterised in that include：
The pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave of flexible DC power transmission circuit are obtained respectively；
Obtain the pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit；
The modulus maximum of the pole mould backward voltage fault transient travelling wave is obtained, the pole mould backward voltage failure is calculated temporary
The equivalent pole mould backward voltage traveling wave of state traveling wave.
2. the processing method of flexible DC power transmission line fault traveling wave according to claim 1, it is characterised in that the difference
Obtain the pole mould current failure transient state travelling wave and the pole mode voltage fault transient travelling wave is specifically included：
In the flexible DC power transmission line failure, with electric current of the predetermined sampling rate to the flexible DC power transmission circuit
Sampled with voltage and poke, obtained current sample value sequence or voltage sample value sequence；
To the positive pole electric current i in the current sample value sequencep(n) and cathodal current inN the sampled value of () carries out pole modular transformation,
The positive pole electric current and cathodal current decoupling that there will be electromagnetic coupled relation is zero independent mould current failure transient state travelling wave i0(n) and
Pole mould current failure transient state travelling wave i1(n)；
To the cathode voltage u in the voltage sample value sequencep(n) and cathode voltage unN the sampled value of () carries out pole modular transformation,
The cathode voltage and cathode voltage decoupling that there will be electromagnetic coupled relation is zero independent mode voltage fault transient travelling wave u0(n) and
Pole mode voltage fault transient travelling wave u1(n)。
3. the processing method of flexible DC power transmission line fault traveling wave according to claim 2, it is characterised in that the acquisition
The pole mould backward voltage fault transient travelling wave of flexible DC power transmission circuit is specifically included：
Using the inductance L of the pole mould unit length of the flexible DC power transmission circuitlWith the electric capacity C of pole mould unit length1, ask for
Pole mould natural impedance Zc1；
Using the pole mould current failure transient state travelling wave i1(n), the pole mode voltage fault transient travelling wave u1(n) and the pole mould
Natural impedance Zc1, ask for the pole mould backward voltage fault transient travelling wave ur1(n)。
4. the processing method of flexible DC power transmission line fault traveling wave according to claim 3, it is characterised in that the acquisition
The modulus maximum of the pole mould backward voltage fault transient travelling wave, obtains the equivalent of the pole mould backward voltage fault transient travelling wave
Pole mould backward voltage traveling wave is specifically included：
To the pole mould backward voltage fault transient travelling wave ur1N () carries out wavelet transformation, obtain corresponding wavelet conversion coefficient；
The modulus maximum of the wavelet conversion coefficient is asked for respectively；
Singularity identification is carried out to the modulus maximum of the wavelet conversion coefficient, Lipschitz exponent, cancelling noise interference is calculated；
Eliminate interference of the continuous signal discretization to the modulus maximum of the wavelet conversion coefficient；
By the pole mould backward voltage fault transient travelling wave the wavelet conversion coefficient of everywhere modulus maximum with this at
Impulse function expressed, the amplitude of the impulse function is equal with the modulus maximum of the wavelet conversion coefficient at this, will
The impulse function sequence that the impulse function is constituted is used as the equivalent pole mould backward voltage traveling wave.
5. the processing method of flexible DC power transmission line fault traveling wave according to claim 4, it is characterised in that the small echo
Conversion is using the derived function of three subcenter B-spline functions as wavelet function, wavelet coefficient sequences hk?k∈z, gk?k∈zFor：
Hk?k∈z=(0.125,0.375,0.375,0.125) (k=-1,0,1,2),
Gk?k∈z=(- 2,2) (k=0,1),
After the wavelet transformation, the pole mould backward voltage fault transient travelling wave is resolved into into following form：
Wherein, A2jur1N () is the pole mould backward voltage fault transient travelling wave ur1The wavelets approximation coefficient of (n), W2jur1N () is
The pole mould backward voltage fault transient travelling wave ur1The wavelet conversion coefficient of (n).
6. the processing method of flexible DC power transmission line fault traveling wave according to claim 4, it is characterised in that the small echo
The modulus maximum of conversion coefficient is：
For any given positive number ε>0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, have
Set up,
Wherein, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,It is reversely electric for the pole mould
Pressure fault transient travelling wave is in sampling sequence number n0The modulus maximum of the wavelet conversion coefficient at place, yardsticks of the j for wavelet transformation.
7. the processing method of flexible DC power transmission line fault traveling wave according to claim 4, it is characterised in that the Li Pu
Wishing hereby index is：
Wherein, α is Lipschitz exponent, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,For
The modulus maximum of the wavelet conversion coefficient at the sampling sequence number, yardsticks of the j for wavelet transformation；
Work as α<When 0, the modulus maximum at the sampling sequence number is the noise jamming, by the modulus maximum at the sampling sequence number
Reject.
8. the processing method of flexible DC power transmission line fault traveling wave according to claim 4, it is characterised in that by maximum norm
Modulus maximum of the maximum below 10% is defined as interference of the continuous signal discretization to the modulus maximum, and rejects institute
State interference.
9. a kind of processing meanss of flexible DC power transmission line fault traveling wave, it is characterised in that include：
Pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave acquiring unit, obtain flexible DC power transmission circuit
Pole mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave；
Pole mould backward voltage fault transient travelling wave acquiring unit, for obtaining the pole mould backward voltage event of flexible DC power transmission circuit
Barrier transient state travelling wave；And
Computing unit, for obtaining the modulus maximum of the pole mould backward voltage fault transient travelling wave, is calculated the pole mould
The equivalent pole mould backward voltage traveling wave of backward voltage fault transient travelling wave.
10. processing meanss of flexible DC power transmission line fault traveling wave according to claim 9, it is characterised in that the pole
Mould current failure transient state travelling wave and pole mode voltage fault transient travelling wave acquiring unit are specifically included：
Sampling unit, in the flexible DC power transmission line failure, with predetermined sampling rate to the flexible DC power transmission
The electric current and voltage of circuit is sampled and poke, obtains current sample value sequence or voltage sample value sequence；
Pole modular transformation unit, for the positive pole electric current i in the current sample value sequencep(n) and cathodal current inN () adopts
Sample value carries out pole modular transformation, and the positive pole electric current and cathodal current decoupling that there will be electromagnetic coupled relation is independent zero mould electric current event
Barrier transient state travelling wave i0(n) and pole mould current failure transient state travelling wave i1(n)；And
To the cathode voltage u in the voltage sample value sequencep(n) and cathode voltage unN the sampled value of () carries out pole modular transformation,
The cathode voltage and cathode voltage decoupling that there will be electromagnetic coupled relation is zero independent mode voltage fault transient travelling wave u0(n) and
Pole mode voltage fault transient travelling wave u1(n)。
The processing meanss of 11. flexible DC power transmission line fault traveling waves according to claim 10, it is characterised in that the pole
Mould backward voltage fault transient travelling wave acquiring unit specifically for：
Using the inductance L of the pole mould unit length of the flexible DC power transmission circuitlWith the electric capacity C of pole mould unit length1, ask for
Pole mould natural impedance Zc1；
Using the pole mould current failure transient state travelling wave i1(n), the pole mode voltage fault transient travelling wave u1(n) and the pole mould
Natural impedance Zc1, ask for the pole mould backward voltage fault transient travelling wave ur1(n)。
12. according to claim 11 flexible DC power transmission line fault traveling wave processing meanss, it is characterised in that the meter
Calculate unit specifically for：
To the pole mould backward voltage fault transient travelling wave ur1N () carries out wavelet transformation, obtain corresponding wavelet conversion coefficient；
The modulus maximum of the wavelet conversion coefficient is asked for respectively；
Singularity identification is carried out to the modulus maximum of the wavelet conversion coefficient, Lipschitz exponent, cancelling noise interference is calculated；
Eliminate interference of the continuous signal discretization to the modulus maximum of the wavelet conversion coefficient；
By the pole mould backward voltage fault transient travelling wave the wavelet conversion coefficient of everywhere modulus maximum with this at
Impulse function expressed, the amplitude of the impulse function is equal with the modulus maximum of the wavelet conversion coefficient at this, will
The impulse function sequence that the impulse function is constituted is used as the equivalent pole mould backward voltage traveling wave.
13. according to claim 12 flexible DC power transmission line fault traveling wave processing meanss, it is characterised in that it is described little
Wave conversion is using the derived function of three subcenter B-spline functions as wavelet function, wavelet coefficient sequences hk?k∈z, gk?k∈zFor：
Hk?k∈z=(0.125,0.375,0.375,0.125) (k=-1,0,1,2),
Gk?k∈z=(- 2,2) (k=0,1),
After the wavelet transformation, the pole mould backward voltage fault transient travelling wave is resolved into into following form：
Wherein,For the pole mould backward voltage fault transient travelling wave ur1The wavelets approximation coefficient of (n),For
The pole mould backward voltage fault transient travelling wave ur1The wavelet conversion coefficient of (n).
14. according to claim 12 flexible DC power transmission line fault traveling wave processing meanss, it is characterised in that it is described little
The modulus maximum of wave conversion coefficient is：
For any given positive number ε>0, work as satisfaction | n-n0|<During ε, to arbitrary n ≠ n0, have
Set up,
Wherein, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,It is reversely electric for the pole mould
Pressure fault transient travelling wave is in sampling sequence number n0The modulus maximum of the wavelet conversion coefficient at place, yardsticks of the j for wavelet transformation.
15. according to claim 12 flexible DC power transmission line fault traveling wave processing meanss, it is characterised in that Lee
Pu Xizi indexes are：
Wherein, α is Lipschitz exponent, n0For the sampling sequence number of the pole mould backward voltage fault transient travelling wave,For
The modulus maximum of the wavelet conversion coefficient at the sampling sequence number, yardsticks of the j for wavelet transformation；
Work as α<When 0, the modulus maximum at the sampling sequence number is the noise jamming, by the modulus maximum at the sampling sequence number
Reject.
16. according to claim 12 flexible DC power transmission line fault traveling wave processing method, it is characterised in that the meter
Calculate unit and be defined as the continuous signal discretization to the mould pole for the modulus maximum by maximum modulus maximum below 10%
The interference of big value, and reject the interference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610996242.XA CN106526422B (en) | 2016-11-11 | 2016-11-11 | Processing method of fault traveling wave of flexible direct current transmission line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610996242.XA CN106526422B (en) | 2016-11-11 | 2016-11-11 | Processing method of fault traveling wave of flexible direct current transmission line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106526422A true CN106526422A (en) | 2017-03-22 |
| CN106526422B CN106526422B (en) | 2020-03-27 |
Family
ID=58351410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610996242.XA Active CN106526422B (en) | 2016-11-11 | 2016-11-11 | Processing method of fault traveling wave of flexible direct current transmission line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106526422B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038515A (en) * | 2018-07-09 | 2018-12-18 | 中国电力科学研究院有限公司 | A kind of Hybrid HVDC route traveling-wave protection method and system based on Dual Tree Complex Wavelet variation |
| CN110021912A (en) * | 2019-04-28 | 2019-07-16 | 山东大学 | The adaptive reclosing method of multiterminal flexible direct current power grid based on hybrid dc circuit breaker |
| CN112202151A (en) * | 2020-09-24 | 2021-01-08 | 华中科技大学 | Pilot protection method and pilot protection system for high-voltage direct-current transmission line |
| CN112595932A (en) * | 2020-12-23 | 2021-04-02 | 西安科技大学 | Single-pole fault line selection method suitable for medium-voltage direct-current power distribution network |
| CN113311287A (en) * | 2021-04-28 | 2021-08-27 | 上海电力大学 | Fault location method applied to direct-current power distribution network controlled by two-end VSC |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013671A (en) * | 2010-12-13 | 2011-04-13 | 山东大学 | Transient travelling wave amplitude integral type superspeed bus protection system and method thereof |
| CN102253310A (en) * | 2011-05-18 | 2011-11-23 | 昆明理工大学 | Method for identifying property of second wave head during fault location of alternating-current power transmission line |
| CN102854438A (en) * | 2012-09-26 | 2013-01-02 | 浙江省电力公司电力科学研究院 | Method and device for identifying second travelling wave in travelling wave distance protection |
| CN105244861A (en) * | 2015-10-23 | 2016-01-13 | 清华大学 | Transmission line protection method and transmission line protection device |
| CN105259473A (en) * | 2015-10-23 | 2016-01-20 | 清华大学 | Judging method and judging device for fault direction of transmission line |
| CN105334426A (en) * | 2015-10-23 | 2016-02-17 | 清华大学 | Processing method and processing device for power transmission line fault traveling wave |
| CN105518958A (en) * | 2014-11-13 | 2016-04-20 | Abb技术有限公司 | DC power grid current differential protection method and system thereof |
-
2016
- 2016-11-11 CN CN201610996242.XA patent/CN106526422B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102013671A (en) * | 2010-12-13 | 2011-04-13 | 山东大学 | Transient travelling wave amplitude integral type superspeed bus protection system and method thereof |
| CN102253310A (en) * | 2011-05-18 | 2011-11-23 | 昆明理工大学 | Method for identifying property of second wave head during fault location of alternating-current power transmission line |
| CN102854438A (en) * | 2012-09-26 | 2013-01-02 | 浙江省电力公司电力科学研究院 | Method and device for identifying second travelling wave in travelling wave distance protection |
| CN105518958A (en) * | 2014-11-13 | 2016-04-20 | Abb技术有限公司 | DC power grid current differential protection method and system thereof |
| CN105244861A (en) * | 2015-10-23 | 2016-01-13 | 清华大学 | Transmission line protection method and transmission line protection device |
| CN105259473A (en) * | 2015-10-23 | 2016-01-20 | 清华大学 | Judging method and judging device for fault direction of transmission line |
| CN105334426A (en) * | 2015-10-23 | 2016-02-17 | 清华大学 | Processing method and processing device for power transmission line fault traveling wave |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109038515A (en) * | 2018-07-09 | 2018-12-18 | 中国电力科学研究院有限公司 | A kind of Hybrid HVDC route traveling-wave protection method and system based on Dual Tree Complex Wavelet variation |
| CN110021912A (en) * | 2019-04-28 | 2019-07-16 | 山东大学 | The adaptive reclosing method of multiterminal flexible direct current power grid based on hybrid dc circuit breaker |
| CN112202151A (en) * | 2020-09-24 | 2021-01-08 | 华中科技大学 | Pilot protection method and pilot protection system for high-voltage direct-current transmission line |
| CN112202151B (en) * | 2020-09-24 | 2021-08-03 | 华中科技大学 | Pilot protection method and pilot protection system for high-voltage direct-current transmission line |
| CN112595932A (en) * | 2020-12-23 | 2021-04-02 | 西安科技大学 | Single-pole fault line selection method suitable for medium-voltage direct-current power distribution network |
| CN112595932B (en) * | 2020-12-23 | 2024-03-01 | 西安科技大学 | Monopole fault line selection method suitable for medium-voltage direct-current power distribution network |
| CN113311287A (en) * | 2021-04-28 | 2021-08-27 | 上海电力大学 | Fault location method applied to direct-current power distribution network controlled by two-end VSC |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106526422B (en) | 2020-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106526422A (en) | Method for processing fault traveling wave of flexible DC transmission line | |
| CN104977502B (en) | A kind of extra high voltage direct current transmission line internal fault external fault recognition methods | |
| CN106501677A (en) | The flexible DC power transmission overhead transmission line failure quick judgment method of threshold value of need not adjusting | |
| Wang et al. | A pilot protection scheme for transmission lines in VSC-HVDC grid based on similarity measure of traveling waves | |
| CN108075728A (en) | A kind of photovoltaic system DC side arc fault type identification and protective device | |
| Wang et al. | Traveling wave propagation characteristic-based LCC-MMC hybrid HVDC transmission line fault location method | |
| Gao et al. | A novel whole-line quick-action protection principle for HVDC transmission lines using one-end voltage | |
| WO2019080238A1 (en) | Time-domain calculation method for voltage traveling wave differential protection of flexible direct-current transmission line | |
| Zou et al. | Novel transient-energy-based directional pilot protection method for HVDC line | |
| CN106443335A (en) | Lightning stroke fault identification method and system | |
| CN104280644B (en) | Direct-current transmission project typical transient fault recognizing method | |
| CN105098738A (en) | Pilot protection method of high-voltage direct current transmission line based on S transformation | |
| CN113300336B (en) | Novel high-voltage direct-current transmission line protection method | |
| CN101949994A (en) | Form peak valley detection method for identifying internal and external faults of ultra high voltage direct current transmission line | |
| CN108599114A (en) | A kind of high voltage ac/dc combined hybrid system alternating current circuit transient state direction protection method | |
| CN106771700A (en) | The method for quickly identifying and device of flexible DC power transmission circuit thunderbolt interference | |
| CN106560718A (en) | Grounding fault current detection protection method and device | |
| CN104237731A (en) | Single-phase earth fault line selection method on basis of EEMD (ensemble empirical mode decomposition) and energy method for resonance earthed power distribution network | |
| Chu et al. | Analytical method of fault characteristic and non-unit protection for HVDC transmission lines | |
| CN111711175A (en) | Flexible direct-current distribution line protection method based on transient current waveform similarity recognition | |
| CN111463764B (en) | Direct-current transmission line protection method based on initial voltage traveling wave frequency domain attenuation rate | |
| Lin et al. | A dual-window transient energy ratio-based adaptive single-phase reclosure criterion for EHV transmission line | |
| CN113300343B (en) | Flexible direct-current power grid fault line identification method based on cosine similarity | |
| CN112630590A (en) | Flexible direct current transmission line lightning stroke interference identification method, device and system and readable storage medium | |
| Wang et al. | Study on the traveling wave differential protection and the improvement scheme for VSC-HVDC transmission lines |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |