CN109507533B - A kind of single-ended quick-action main protection method of HVDC transmission line - Google Patents
A kind of single-ended quick-action main protection method of HVDC transmission line Download PDFInfo
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- CN109507533B CN109507533B CN201811440401.3A CN201811440401A CN109507533B CN 109507533 B CN109507533 B CN 109507533B CN 201811440401 A CN201811440401 A CN 201811440401A CN 109507533 B CN109507533 B CN 109507533B
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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Abstract
A kind of single-ended quick-action main protection method of HVDC transmission line, step are main are as follows: A, acquisition rectifier outlet side electric current ia(t) and DC filter outlet side electric current ib(t)；B, the rectified current at nearest 300 moment is subjected to wavelet decomposition and reconstructed, obtain time high band rectification wavelet decomposition electric current summation；C, the filtered electrical flow valuve at nearest 300 moment is subjected to wavelet decomposition and reconstructed, obtain wavelet decomposition electric current summation after time high band filtering；D, the difference D (t) of wavelet decomposition electric current summation and rectification wavelet decomposition electric current summation after time high band filters is calculated；Obtain the secondary high-band currents difference average value at nearest 100 momentE, as follows high-band currents signal difference average valueIt is greater than the set value Dset, then power line main protection acts；Otherwise, it is failure to actuate.The main protection movement of the method is more reliable, accurate.
Description
Technical field
The present invention relates to a kind of single-ended quick-action main protection methods of HVDC transmission line.
Background technique
The contrary distribution characteristic of China's non-renewable energy and electric load determines that high voltage power transmission will be in China's electric network composition
Occupy the status to become more and more important.In high voltage power transmission, compared to high-voltage AC transmission, the voltage of D.C. high voltage transmission is constant, does not have
Kelvin effect, the more powerful of transmission, economic benefit are more preferable, it is made to show one's talent in long distance power transmission.Currently, China Power Grids
It builds together into and puts into operation high voltage direct current transmission project 29, include 7 ± 800kV extra-high voltage direct-current transmission engineerings, formed extensive
The energy source configuration pattern of " transferring electricity from the west to the east ", " sending in nortel south ".Transregional to the year two thousand twenty, transnational power grid transmission capacity is up to 4.1 hundred million
KW, the conveying distance of the Northwest to east is up to 2000~3000km or more.
Since transmission distance is remote, transmission line of electricity is long and ambient enviroment is severe, is easy to appear the failures such as area's internal short-circuit.According to existing
Operating experience, line fault accounts for about the 50% of DC transmission system whole failure in area, route after line fault occurs in area
Main protection correctly acts, disconnects only the 50% of faulty line, and line fault is responded by DC control system in the other half area
Movement, direct current locking, closes the sending end of entire transmission system, causes unnecessary system shutdown, cause huge equipment loss
And economic loss.
Ideal DC power transmission line main protection carries out the route troubles inside the sample space between the electric current measuring point of route two sides
Movement, and to the external area error except measuring point should be failure to actuate and by control system response action.China's high-voltage dc transmission electric wire
The protective device of ABB and Siemens Company is widely used in road main protection, and main protection configuration traveling-wave protection, traveling-wave protection is with failure
Wavefront voltage, current change quantity and the change rate in the electric current of line outlet side are criterion afterwards, carry out line fault detection, when
Calculated value is more than setting valve, exports main protection action signal.Practical Project operating experience shows that existing traveling wave main protection scheme is deposited
In certain defect: 1) traveling-wave protection can not be acted in high resistance earthing fault in area of the route distal end ground resistance greater than 100 Ω；2)
Traveling-wave protection can be to the especially metallic earthing failure malfunction of non-high resistance earthing fault outside route distal area.Its tripping and malfunction
The reason is as follows that: when distal end high resistance earthing fault in generating region, since ground resistance is big and fault distance is remote, make traveling-wave protection meter
The variable quantity of the electric parameter (wavefront voltage, current change quantity and change rate) used in the time domain is calculated to be substantially reduced, so that
It is unable to satisfy main operating criterion, not can be carried out main protection movement；And outside generating region when metallic earthing failure, due to ground resistance
It is minimum, traveling-wave protection calculated value can be made to meet protection act criterion, main protection malfunction in generating region.Therefore, traveling wave main protection without
Method correctly distinguishes the high resistance earthing fault in route distal area and the metallic earthing failure outside distal area, and reliability is low.
Summary of the invention
The object of the present invention is to provide a kind of single-ended quick-action main protection methods of HVDC transmission line, and this method is to height
Press remote and high resistance earthing fault the recall rate of DC power transmission line high and low to the erroneous detection extracting rate of external area error, it can be more
The safety and stability and efficient operation of HVDC transmission system are ensured well.
The technical scheme adopted by the invention for realizing the object of the invention is a kind of single-ended quick-action of HVDC transmission line
Main protection method, its step are as follows:
A, data acquire
The protective device of HVDC transmission system acquires DC power transmission line rectification with the sample frequency of 100kHz in real time
The electric current of device outlet side and the electric current of DC filter outlet side respectively obtain the rectified current discrete value i of current time ta(t)
Electric current discrete value i after filtering with current time tb(t)；
B, the processing of rectified current signal
By the rectified current discrete value i of 299 moment and current time t beforea(t-299)、ia(t-298)、ia(t-
297)…ia(t-2)、ia(t-1)、ia(t), the rectified current sequence I of current time t is constituteda(t),Ia(t)=[ia(t-299)、
ia(t-298)、ia(t-297)…ia(t-2)、ia(t-1)、ia(t)]；
To the rectified current sequence I of current time ta(t) 10 layers of wavelet decomposition are carried out and are reconstructed, obtain current time t's
The rectified current sequence of 10 frequency ranges, records therein:
The third frequency range that frequency range is 12.5~6.25kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the third frequency range of current time t；
The 4th frequency range that frequency range is 6.25~3.12kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the 4th frequency range of current time t；
The 5th frequency range that frequency range is 3.12~1.56kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the 5th frequency range of current time t；
The third frequency range of current time t is rectified into wavelet decomposition current sequenceIn all rectification wavelet decompositions electricity
Flow valuve, the 4th frequency range rectify wavelet decomposition current sequenceIn all rectification wavelet decomposition current values and the 5th frequency range it is whole
Flow wavelet decomposition current sequenceIn all rectification wavelet decomposition current values it is cumulative, obtain the secondary high band of current time t
It rectifies wavelet decomposition electric current summation A (t),
C, the processing of filtered current signal
By electric current discrete value i after the filtering of 299 moment and current time t beforeb(t-299)、ib(t-298)、ib
(t-297)…ib(t-2)、ib(t-1)、ib(t), current sequence I after the filtering of composition current time tb(t),Ib(t)=[ib(t-
299)、ib(t-298)、ib(t-297)…ib(t-2)、ib(t-1)、ib(t)]；
To current sequence I after the filtering of current time t2(t) 10 layers of wavelet decomposition are carried out and are reconstructed, current time t is obtained
10 frequency ranges filtering after current sequence, record therein:
Wavelet decomposition current sequence after the third frequency range filtering that frequency range is 12.5~6.25kHz Wherein
For wavelet decomposition current value after the third frequency range filtering of current time t；
Wavelet decomposition current sequence after the 4th frequency range filtering that frequency range is 6.25~3.12kHz WhereinFor wavelet decomposition current value after the 4th frequency range filtering of current time t；
Wavelet decomposition current sequence after the 5th frequency range filtering that frequency range is 3.12~1.56kHz Wherein
For wavelet decomposition current value after the 5th frequency range filtering of current time t；
Wavelet decomposition current sequence after the third frequency range of current time t is filteredIn all filtering after small wavelength-division
Solve current value, wavelet decomposition current sequence after the filtering of the 4th frequency rangeIn all filtering after wavelet decomposition current value and
Wavelet decomposition current sequence after the filtering of five frequency rangesIn all filtering after wavelet decomposition current value it is cumulative, when obtaining current
Wavelet decomposition electric current summation B (t) after the secondary high band filtering at quarter t,
D, the calculating of current signal difference
By C step current time t secondary high band filtering after wavelet decomposition electric current summation B (t), subtract B walk it is current when
The secondary high band for carving t rectifies wavelet decomposition electric current summation A (t), obtains the secondary high-band currents signal difference D of current time t
(t), D (t)=B (t)-A (t)；
The secondary high-band currents signal difference D (t) at 99 moment by current time t and before is averaged, and is worked as
The secondary high-band currents signal difference average value of preceding moment t
E, protection act
Such as the secondary high-band currents signal difference average value of current time tIt is set greater than secondary high-band currents signal difference
Value Dset, then determine that there are failures in line areas, export main protection signal, power line main protection movement；Otherwise, it is determined that in line areas
There is no failures, do not export main protection signal.
The principle of the method for the present invention is as follows:
Transmission line malfunction electric current contains transient information abundant, different faults position especially area's internal and external fault by
The influence of DC line two reactors and filter, the transient information difference being transferred at measuring point are very big.Compared to traditional row
Wave protection only carries out fault identification using the temporal signatures of line fault electric current, and the present invention is using former and later two fault currents of filtering
It identifies internal fault external fault, and extracts the transient information that wherein can most react troubles inside the sample space, accuracy is higher.
When failure does not occur, route is under accidental conditions, at this point, 12k times to its two sides of DC filter
Fundamental current (k=1,2,3 ..., fundamental frequency 50Hz) has filtration, these frequency points only account for frequency range very little selected by the present invention
A part, filter influence very little to remaining current component, therefore when route normal work, electric current ib(t)、ia(t) special frequency channel
Difference is smaller, only embodies the natural difference of filter two sides electric current.
When ground fault occurs in line areas, a large amount of Transient High Frequency Signals that fault point generates are rapidly transmitted to line side
Electric current measuring point, therefore line side current signal ib(t) high fdrequency component contained by is abundant, and after filter transfer to rectification side, ia
(t) high fdrequency component is greatly attenuated, and is calculated gained special frequency channel difference and is far longer than the external earth fault of system worked well and area.Cause
This, calculated two current signal is very big in selected frequency range difference, can be carried out reliable main protection.
When ground fault occurs outside line end area, fault point equally generates a large amount of transient signals, but since transient state is believed
Number be propagated through inversion side filter and entire route, make ia(t) and ib(t) high fdrequency component contained by is significantly compared with troubles inside the sample space
It reduces, and rectifier side electric current ia(t) high fdrequency component contained by decays after rectifying side filter again, therefore line side DC is electric
Flow ib(t) high fdrequency component contained by is still more than rectifier side DC current ia(t) high fdrequency component contained by, and gained special frequency channel difference is big
In system worked well value, but it is poor to be less than the special frequency channel that troubles inside the sample space generates.Therefore, calculated two current signal is in institute
Frequency-selecting segment difference is smaller, will not generate main protection malfunction.
According to the above feature, the present invention has stronger knowledge to ultra-high-tension power transmission line high resistive fault and distal end internal fault external fault
Other ability and quick Motor ability.
Compared with prior art, the beneficial effects of the present invention are:
One, when ground fault occurs in line areas, a large amount of Transient High Frequency Signals that fault point generates are rapidly transmitted to line
Trackside electric current measuring point, therefore line side current signal ib(t) high fdrequency component contained by is abundant, and passes through filter transfer to rectification side
Afterwards, ia(t) high fdrequency component is greatly attenuated, and is calculated gained special frequency channel difference and is far longer than system worked well and area's external ground event
Barrier.Therefore, calculated two current signal is very big in selected frequency range difference, can be carried out reliable main protection.In short, the present invention is not
Using the temporal signatures vulnerable to fault distance and the electric current of fault resstance influence, but ground fault can be reacted by having selected three
The frequency range of feature, selected frequency range are influenced small by fault resstance and abort situation, are allowed to fault resstance and abort situation
Tolerance enhancing, improves the recognition capability to troubles inside the sample space, protection act is not influenced by fault distance, can be reliably
Protection circuit overall length.
Two, when ground fault occurs outside line end area, fault point equally generates a large amount of transient signals, but due to transient state
Signal is propagated through inversion side filter and entire route, makes ia(t) and ib(t) high fdrequency component contained by is big compared with troubles inside the sample space
It is big to reduce, and rectifier side electric current ia(t) high fdrequency component contained by decays after rectifying side filter again, therefore line side DC
Electric current ib(t) high fdrequency component contained by is still more than rectifier side DC current ia(t) high fdrequency component contained by, and gained special frequency channel is poor
Greater than system worked well value, but it is poor to be less than the special frequency channel that troubles inside the sample space generates.Therefore, master will not be generated to external area error
Protection misoperation.Its main protection is accurate, reliable, malfunction rate is low.
Three, the present invention uses all data in 4ms in primary calculate, and improves data sampling using point-by-point sliding window
Accuracy, reduce instantaneous interference signal on identification, protection interference, influence, further improve its reliability；Meanwhile
Reduce protection act delay without carrying out data exchange in route two sides using only line one-end electric parameter；Occur in failure
Troubles inside the sample space can be identified in 4ms afterwards, protection act speed is fast.
Four, structure and hardware of the present invention without changing HVDC transmission system, need to only be based on the existing protection of system
Point acquires electrical quantity signal in real time, and speed is fast, and real-time is good, is suitable for engineer application.
Further, secondary high-band currents signal difference setting value D of the inventionsetValue be 2.
Present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is the secondary high band of period where high resistance earthing fault occurs in route end region in emulation experiment of the present invention
Current signal difference D (t) variation diagram；
Fig. 2 is the secondary high frequency that the metallic earthing guilty culprit period occurs in emulation experiment of the present invention outside route end region
Section current signal difference D (t) variation diagram.
Specific embodiment
Embodiment
A kind of specific embodiment of the invention is a kind of single-ended quick-action main protection method of HVDC transmission line,
Its step are as follows:
A, data acquire
The protective device of HVDC transmission system acquires DC power transmission line rectification with the sample frequency of 100kHz in real time
The electric current of device outlet side and the electric current of DC filter outlet side respectively obtain the rectified current discrete value i of current time ta(t)
Electric current discrete value i after filtering with current time tb(t)；
B, the processing of rectified current signal
By the rectified current discrete value i of 299 moment and current time t beforea(t-299)、ia(t-298)、ia(t-
297)…ia(t-2)、ia(t-1)、ia(t), the rectified current sequence I of current time t is constituteda(t),Ia(t)=[ia(t-299)、
ia(t-298)、ia(t-297)…ia(t-2)、ia(t-1)、ia(t)]；
To the rectified current sequence I of current time ta(t) 10 layers of wavelet decomposition are carried out and are reconstructed, obtain current time t's
The rectified current sequence of 10 frequency ranges, records therein:
The third frequency range that frequency range is 12.5~6.25kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the third frequency range of current time t；
The 4th frequency range that frequency range is 6.25~3.12kHz rectifies wavelet decomposition current sequence WhereinWavelet decomposition current value is rectified for the 4th frequency range of current time t；
The 5th frequency range that frequency range is 3.12~1.56kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the 5th frequency range of current time t；
The third frequency range of current time t is rectified into wavelet decomposition current sequenceIn all rectification wavelet decompositions electricity
Flow valuve, the 4th frequency range rectify wavelet decomposition current sequenceIn all rectification wavelet decomposition current values and the 5th frequency range it is whole
Flow wavelet decomposition current sequenceIn all rectification wavelet decomposition current values it is cumulative, obtain the secondary high band of current time t
It rectifies wavelet decomposition electric current summation A (t),
C, the processing of filtered current signal
By electric current discrete value i after the filtering of 299 moment and current time t beforeb(t-299)、ib(t-298)、ib
(t-297)…ib(t-2)、ib(t-1)、ib(t), current sequence I after the filtering of composition current time tb(t),Ib(t)=[ib(t-
299)、ib(t-298)、ib(t-297)…ib(t-2)、ib(t-1)、ib(t)]；
To current sequence I after the filtering of current time t2(t) 10 layers of wavelet decomposition are carried out and are reconstructed, current time t is obtained
10 frequency ranges filtering after current sequence, record therein:
Wavelet decomposition current sequence after the third frequency range filtering that frequency range is 12.5~6.25kHz Wherein
For wavelet decomposition current value after the third frequency range filtering of current time t；
Wavelet decomposition current sequence after the 4th frequency range filtering that frequency range is 6.25~3.12kHz Wherein
For wavelet decomposition current value after the 4th frequency range filtering of current time t；
Wavelet decomposition current sequence after the 5th frequency range filtering that frequency range is 3.12~1.56kHz WhereinFor wavelet decomposition current value after the 5th frequency range filtering of current time t；
Wavelet decomposition current sequence after the third frequency range of current time t is filteredIn all filtering after small wavelength-division
Solve current value, wavelet decomposition current sequence after the filtering of the 4th frequency rangeIn all filtering after wavelet decomposition current value and
Wavelet decomposition current sequence after the filtering of five frequency rangesIn all filtering after wavelet decomposition current value it is cumulative, when obtaining current
Wavelet decomposition electric current summation B (t) after the secondary high band filtering at quarter t,
D, the calculating of current signal difference
By C step current time t secondary high band filtering after wavelet decomposition electric current summation B (t), subtract B walk it is current when
The secondary high band for carving t rectifies wavelet decomposition electric current summation A (t), obtains the secondary high-band currents signal difference D of current time t
(t), D (t)=B (t)-A (t)；
The secondary high-band currents signal difference D (t) at 99 moment by current time t and before is averaged, and is worked as
The secondary high-band currents signal difference average value of preceding moment t
E, protection act
Such as the secondary high-band currents signal difference average value of current time tIt is set greater than secondary high-band currents signal difference
Value Dset, then determine that there are failures in line areas, export main protection signal, power line main protection movement；Otherwise, it is determined that in line areas
There is no failures, do not export main protection signal.
The secondary high-band currents signal difference setting value D of this examplesetValue be 2.
Emulation experiment
To verify the accuracy that the route troubles inside the sample space of guard method of the invention detects, established using PSCAD/EMTDC
HVDC transmission system simulation model；The troubles inside the sample space and external area error of different distance, different grounding resistance are set, to compare
Illustrate this method for the action message of troubles inside the sample space and being reliably failure to actuate to external area error；Believed with Matlab handling failure
Number, the average value and protection act situation of the special frequency channel difference under the fault condition that traveling-wave protection can not be acted correctly are obtained,
As shown in table 1.
Protection act situation (being the failure that traveling-wave protection can not be acted correctly) under the various fault conditions of table 1
Table 1 shows that the ground resistance that can not correctly act for traveling-wave protection is 100 Ω, 500 Ω, and fault distance exists
The ground fault of 1000-2500km, the method for the present invention protection accurately, can be identified quickly；Namely the present invention can effective identification line
The high resistance earthing fault occurred in the end region of road.Fig. 1 is that high resistance ground event occurs in emulation experiment of the present invention in route end region
Secondary high-band currents signal difference D (t) variation diagram of period where barrier；Fig. 1 explanation, area interior lines great distance end high resistive fault occur
When, secondary high-band currents signal difference D (t) value that the method for the present invention obtains is significantly greater than protection seting value, can quickly identify simultaneously
Protection act.Illustrate that the present invention is strong for the route distal end high resistive fault recognition capability in area.
Table 2 is it is also shown that the metallic earthing failure that ground resistance is 0.1 Ω (greater than 2500km) outside to area, side of the present invention
Method will not be identified and be acted namely the present invention can reliably be failure to actuate for any external area error and (main protection not occur
Malfunction), meet the basic principle and requirement protected in area.Fig. 2 is that gold occurs outside route end region in emulation experiment of the present invention
Secondary high-band currents signal difference D (t) variation diagram of period where attribute ground fault；Gold occurs for Fig. 2 explanation, out-of-area line road
When attribute (low-resistance) ground fault failure, secondary high-band currents signal difference D (t) value that the method for the present invention obtains is less than protection and sets
Definite value will not identify and carry out main protection movement.Also illustrate that the present invention can reliably be failure to actuate for any external area error,
Meet the basic principle and requirement protected in area.
Claims (2)
1. a kind of single-ended quick-action main protection method of HVDC transmission line, its step are as follows:
A, data acquire
The protective device of HVDC transmission system is acquired DC power transmission line rectifier in real time and is gone out with the sample frequency of 100kHz
The mouth electric current of side and the electric current of DC filter outlet side, respectively obtain the rectified current discrete value i of current time ta(t) and work as
Electric current discrete value i after the filtering of preceding moment tb(t)；
B, the processing of rectified current signal
By the rectified current discrete value i of 299 moment and current time t beforea(t-299)、ia(t-298)、ia(t-
297)…ia(t-2)、ia(t-1)、ia(t), the rectified current sequence I of current time t is constituteda(t),Ia(t)=[ia(t-299)、
ia(t-298)、ia(t-297)…ia(t-2)、ia(t-1)、ia(t)]；
To the rectified current sequence I of current time ta(t) 10 layers of wavelet decomposition are carried out and are reconstructed, 10 frequencies of current time t are obtained
The rectified current sequence of section, records therein:
The third frequency range that frequency range is 12.5~6.25kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the third frequency range of current time t；
The 4th frequency range that frequency range is 6.25~3.12kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the 4th frequency range of current time t；
The 5th frequency range that frequency range is 3.12~1.56kHz rectifies wavelet decomposition current sequence Wherein
Wavelet decomposition current value is rectified for the 5th frequency range of current time t；
The third frequency range of current time t is rectified into wavelet decomposition current sequenceIn all rectification wavelet decomposition current values,
4th frequency range rectifies wavelet decomposition current sequenceIn all rectification wavelet decomposition current values and the 5th frequency range rectify small echo
Decompose current sequenceIn all rectification wavelet decomposition current values it is cumulative, obtain current time t secondary high band rectify it is small
Wave Decomposition electric current summation A (t),
C, the processing of filtered current signal
By electric current discrete value i after the filtering of 299 moment and current time t beforeb(t-299)、ib(t-298)、ib(t-
297)…ib(t-2)、ib(t-1)、ib(t), current sequence I after the filtering of composition current time tb(t),Ib(t)=[ib(t-
299)、ib(t-298)、ib(t-297)…ib(t-2)、ib(t-1)、ib(t)]；
To current sequence I after the filtering of current time t2(t) 10 layers of wavelet decomposition are carried out and are reconstructed, 10 of current time t are obtained
Current sequence after the filtering of frequency range records therein:
Wavelet decomposition current sequence after the third frequency range filtering that frequency range is 12.5~6.25kHz Wherein
For wavelet decomposition current value after the third frequency range filtering of current time t；
Wavelet decomposition current sequence after the 4th frequency range filtering that frequency range is 6.25~3.12kHz WhereinFor wavelet decomposition current value after the 4th frequency range filtering of current time t；
Wavelet decomposition current sequence after the 5th frequency range filtering that frequency range is 3.12~1.56kHz Wherein
For wavelet decomposition current value after the 5th frequency range filtering of current time t；
Wavelet decomposition current sequence after the third frequency range of current time t is filteredIn all filtering after wavelet decomposition electric current
Value, wavelet decomposition current sequence after the filtering of the 4th frequency rangeIn all filtering after wavelet decomposition current value and the 5th frequency range
Wavelet decomposition current sequence after filteringIn all filtering after wavelet decomposition current value it is cumulative, obtain time of current time t
Wavelet decomposition electric current summation B (t) after high band filtering,
D, the calculating of current signal difference
By wavelet decomposition electric current summation B (t) after the secondary high band filtering of the current time t of C step, subtract the current time t's of B step
Secondary high band rectifies wavelet decomposition electric current summation A (t), obtains the secondary high-band currents signal difference D (t) of current time t, D (t)
=B (t)-A (t)；
The secondary high-band currents signal difference D (t) at 99 moment by current time t and before is averaged, when obtaining current
Carve the secondary high-band currents signal difference average value of t
E, protection act
Such as the secondary high-band currents signal difference average value of current time tGreater than secondary high-band currents signal difference setting value Dset,
Then determine that there are failures in line areas, export main protection signal, power line main protection movement；Otherwise, it is determined that being not present in line areas
Failure does not export main protection signal.
2. a kind of single-ended quick-action main protection method of HVDC transmission line as described in claim 1, it is characterised in that: institute
The secondary high-band currents signal difference setting value D statedsetValue be 2.
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| CN102255293A (en) * | 2011-07-26 | 2011-11-23 | 西安交通大学 | Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region |
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