CN110086154A - A kind of longitudinal protection method and system - Google Patents
A kind of longitudinal protection method and system Download PDFInfo
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- CN110086154A CN110086154A CN201910389161.7A CN201910389161A CN110086154A CN 110086154 A CN110086154 A CN 110086154A CN 201910389161 A CN201910389161 A CN 201910389161A CN 110086154 A CN110086154 A CN 110086154A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/263—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of measured values
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Abstract
The invention discloses a kind of longitudinal protection methods, comprising: is pre-configured with the data content for protected element；Training sample is acquired at the pilot protection device of protected element under different fault parameters, and each training sample acquired meets the configuration of data content；By each training sample input into preset intelligent algorithm to be trained to intelligent algorithm；Testing data is acquired from the pilot protection device of protected element, and testing data meets the configuration of data content；Testing data is input to the intelligent algorithm after training, when determining protected element generation internal fault, the failure removal for being directed to protected element is executed by pilot protection device.Using the scheme of the application, be conducive to the movement speed and accuracy that improve pilot protection.Disclosed herein as well is a kind of pilot protection systems, have relevant art effect.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System fields, more particularly to a kind of longitudinal protection method and system.
Background technique
Traditional Principles of Relay Protection is realized using the frequency-region signal of voltage, electric current.It is realized based on frequency-region signal
Protection needs first to extract frequency domain components using Fourier scheduling algorithm from collected time-domain signal, for example, by using all-wave Fourier
Leaf algorithm needs the data window of at least one fundamental frequency cycles, so that protection act speed is lower.
When executing the pilot protection of transmission line of electricity, a kind of common scheme is the direction of exchange logic signal or apart from vertical
UNPROFOR shield, such as the basic principle of exchange block signal is to issue block signal by opposite direction element in external fault to avoid protecting
Shield malfunction, and do not issue block signal when internal fault and therefore protect and can act, still, if the negative side in external fault
Block signal could not be issued to element, protection misoperation will be caused.Another kind is the pilot protection based on current differential principle,
It is determined as internal fault protection act when difference current is greater than setting valve, difference current should be less than setting valve when external fault
So protection is failure to actuate.This mode based on setting valve is by analyzing the fault signature in various possible situations, based on first
It tests knowledge to be set by expert to realize that fault element differentiates, does not have universality, and accuracy rate is limited.
For the protection of bus, current differential principle is generally used.Difference current refers to the secondary electricity for flowing into differential circuit
Flow phasor and, when the difference current of each connecting pin of bus is greater than setting valve, be determined as bus internal fault and then protection act,
When difference current is less than setting valve, it is believed that be that bus operates normally or external fault is so protection is failure to actuate.It is this to be based on
The mode accuracy rate and room for promotion of default setting valve are limited, especially when bus connecting element is more, when external fault
The current transformer of fault branch is easy serious saturation, and bus protection is caused to malfunction.
Transformer pilot protection is generally also to use current differential principle, referred to as Differential Protection of Transformer.According to inflow
The secondary current phasor of differential circuit and the size of (i.e. difference current) determine whether protection acts compared with setting valve, need elder generation
Fundamental frequency phasor is extracted with fourier algorithm from electric current time-domain signal, then calculates difference current, when difference current amplitude is greater than
When setting valve, it is determined as power transformer interior fault protection act, when difference current is less than setting valve, it is believed that be that transformer is normal
Operation or external fault are so protection is failure to actuate.Since setting valve is by industry specialists by analyzing in various possible situations
Fault signature, it is pre-set based on priori knowledge, therefore the objectivity of protection seting value and applicability are limited.Also, it is real
Due to the difference of transformer winding connection set in the application of border, longitudinal differential protection needs to use different secondary wiring modes to disappear
Due to the difference current of phase difference formation when except normal operation.Further, due to being difficult to distinguish transformer excitation flow and interior
Difference when portion's failure, the identification of excitation surge current become the difficult point of puzzlement Differential Protection of Transformer.Although transformer longitudinal is differential
Protection use it is difficult, but due to the never scheme that can substitute, so that longitudinal differential protection still carries change
The main protection role of depressor.
In conclusion improving the movement speed and accuracy of pilot protection how when realizing pilot protection, being current
Those skilled in the art's technical problem urgently to be solved.
Summary of the invention
The object of the present invention is to provide a kind of longitudinal protection method and system, with improve pilot protection movement speed and
Accuracy.
In order to solve the above technical problems, the invention provides the following technical scheme:
A kind of longitudinal protection method, comprising:
It is pre-configured with the data content for protected element；
Training sample is acquired at the pilot protection device of the protected element under different fault parameters, and is acquired
Each training sample meet the configuration of the data content；
By each training sample input into preset intelligent algorithm to be carried out to the intelligent algorithm
Training；
Testing data is acquired from the pilot protection device of the protected element, and the testing data meets institute
State the configuration of data content；
The testing data is input to the intelligent algorithm after training, when determining in the protected element occurs
When portion's failure, the failure removal for being directed to the protected element is executed by the pilot protection device.
Preferably, the protected element is transmission line, the preconfigured data content are as follows:
Three-phase voltage signal u of the first end of the pilot protection device of the transmission line in the duration of settinga1, ub1,
uc1, three-phase current signal ia1, ib1, ic1And line voltage signal uab1, ubc1, uca1In at least six item datas, the transmission line
Three-phase voltage signal u of the second end of the pilot protection device on road in the duration of settinga2, ub2, uc2, three-phase current letter
Number ia2, ib2, ic2And line voltage signal uab2, ubc2, uca2In at least six item datas, altogether at least 12 item datas according to setting
The combination of sequence, and include at least the three-phase current signal i of first enda1, ib1, ic1And the three-phase electricity of second end
Flow signal ia2, ib2, ic2。
Preferably, the data content are as follows: duration of the first end of the pilot protection device of the transmission line in setting
Interior three-phase voltage signal ua1, ub1, uc1, three-phase current signal ia1, ib1, ic1, the pilot protection device of the transmission line
Three-phase voltage signal u of the second end in the duration of settinga2, ub2, uc2, three-phase current signal ia2, ib2, ic2According to setting
The combination of sequence, and the built-up sequence set are as follows: ua1-ia1-ub1-ib1-uc1-ic1-ua2-ia2-ub2-ib2-uc2-ic2。
Preferably, the protected element is the system busbar with N number of port, and N is positive integer, preconfigured described
Data content are as follows:
Three-phase voltage signal u of the pilot protection device of the bus in the duration of settinga, ub, ucAnd the mother
Three-phase current signal of the every one end of the pilot protection device of line in the duration of setting according to setting sequence combination, or
Person are as follows: line voltage signal u of the pilot protection device of the bus in the duration of settingab, ubc, ucaAnd the mother
Three-phase current signal of the every one end of the pilot protection device of line in the duration of setting according to setting sequence combination.
Preferably, in the data content further include: the electric current summing signal i of three-phase respectively heldaz, ibz, icz, wherein iaz
For the sum of the A phase current of N number of port of the pilot protection device in the duration of setting of the bus, ibzFor the bus
N number of port of the pilot protection device in the duration of setting B phase current sum, iczFor the described vertical of the bus
The sum of the C phase current of N number of port of the protective device in the duration of setting.
Preferably, the bus is that there are five the bus of port, the preconfigured data contents for tool are as follows:
Three-phase voltage signal u of the pilot protection device of the bus in the duration of settinga, ub, uc, the bus
The electric current summation of three-phase current signal and three-phase of the every one end of the pilot protection device in the duration of setting respectively held
Signal iaz, ibz, iczAccording to the combination of setting sequence, and the built-up sequence set are as follows:
ua-ub-uc-ia1-ib1-ic1-ia2-ib2-ic2-ia3-ib3-ic3-ia4-ib4-ic4-ia5-ib5-ic5-iaz-ibz-icz；
Wherein, iaz=ia1+ia2+ia3+ia4+ia5, ibz=ib1+ib2+ib3+ib4+ib5, icz=ic1+ic2+ic3+ic4+ic5。
Preferably, the protected element is the transformer with M winding, and M is positive integer, the preconfigured number
According to content are as follows:
Three-phase voltage signal of each side of transformer in the duration of setting, duration of each side of transformer in setting
Interior three-phase current signal, the transformer neutral point are directly grounded the current signal held in the duration of setting, the transformation
The three-phase of the device three-phase current summing signal of each side and the transformer each side in the duration of setting in the duration of setting
Voltage summing signal according to setting sequence combination.
Preferably, in the data content further include: the transformer each side electric current of three-phase in the duration of setting is asked
And signal.
Preferably, the transformer is two-winding transformer and winding coupling group is YN-d11；
In preset data content, the built-up sequence of setting are as follows:
uaΙ-iaΙ-ubΙ-ibΙ-ucΙ-icΙ-uaΠ-iaΠ-ubΠ-ibΠ-ucΠ-icΠ-inΙ-iaz-ibz-icz-uXΙ-iXΙ-uXΠ-iXΠ；
Wherein, uaΙ, ubΙAnd ucΙFor three-phase voltage signal of the high-pressure side in the duration of setting of the transformer；iaΙ,
ibΙAnd icΙFor three-phase current signal of the high-pressure side in the duration of setting of the transformer；uaΠ, ubΠAnd ucΠIt is described
Three-phase voltage signal of the low-pressure side of transformer in the duration of setting；iaΠ, ibΠAnd icΠFor the low-pressure side of the transformer
Three-phase current signal in the duration of setting；inΙThe electricity held in the duration of setting is directly grounded for the transformer neutral point
Flow signal；iaz, ibzAnd iczFor each side electric current summing signal of transformer three-phase in the duration of setting, wherein iaz=
iaΙ+iaΠFor each side electric current summing signal of A phase, ibz=ibΙ+ibΠFor each side electric current summing signal of B phase, icz=icΙ+icΠFor
Each side electric current summing signal of C phase；uXΙAnd uXΠFor the three-phase voltage summation letter of the transformer each side in the duration of setting
Number, wherein uXΙFor the three-phase voltage summing signal of the high voltage side of transformer, uXΙ=uaΙ+ubΙ+ucΙ, uXΠThe transformer low voltage
The three-phase voltage summing signal of side, uXΠ=uaΠ+ubΠ+ucΠ；iXΙAnd iXΠFor the three-phase current summation letter of each side of the transformer
Number, wherein iXΙFor the three-phase current summing signal of the high voltage side of transformer, iXΙ=iaΙ+ibΙ+icΙ, iXΠIt is low for the transformer
Press the three-phase current summing signal of side, iXΠ=iaΠ+ibΠ+icΠ。
A kind of pilot protection system, comprising:
Data content configuration module, for being pre-configured with the data content for being directed to protected element；
Training sample acquisition module, for the pilot protection device under different fault parameters from the protected element
Place's acquisition training sample, and each training sample acquired meets the configuration of the data content；
Training module, for by each training sample input into preset intelligent algorithm to described artificial
Intelligent algorithm is trained；
Testing data acquisition module, for acquiring number to be measured from the pilot protection device of the protected element
According to, and the testing data meets the configuration of the data content；
Pilot protection module, for the testing data to be input to the intelligent algorithm after training, when determining
When stating protected element generation internal fault, cut by pilot protection device execution for the failure of the protected element
It removes.
Using technical solution provided by the embodiment of the present invention, pilot protection is carried out by intelligent algorithm.Specifically,
It is pre-configured with the data content for protected element, from the pilot protection device of protected element under different fault parameters
After place's acquisition training sample, preset intelligent algorithm is trained by training sample, so that artificial after training
Intelligent algorithm can determine protected element happens is that internal fault or external fault.Therefore, from protected element
After acquiring testing data at pilot protection device, the intelligent algorithm after training determines protected element and internal event occurs
When barrier, the failure removal for being directed to protected element can be executed by pilot protection device.Compared to traditional scheme, due to nothing
Time-domain signal need to be converted to frequency-region signal, therefore advantageously reduce differentiation time-consuming, be conducive to the movement speed for improving pilot protection
Degree.And intelligent algorithm is by after training, having accurate identification result.Therefore, the scheme of the application is conducive to improve
The movement speed and accuracy of pilot protection.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of implementation flow chart of longitudinal protection method in the present invention；
Fig. 2 is the structural schematic diagram for the two end model of three-phase that protected element is transmission line；
Fig. 3 a is the training sample that internal A phase ground short circuit Nag occurs in a kind of specific embodiment；
Fig. 3 b is the training sample that internal B phase ground short circuit Nbg occurs in a kind of specific embodiment；
Fig. 3 c is the training sample that internal C phase ground short circuit Ncg occurs in a kind of specific embodiment；
Fig. 3 d is the training sample that external A phase ground short circuit Wag occurs in a kind of specific embodiment；
Fig. 3 e is the training sample that external B phase ground short circuit Wbg occurs in a kind of specific embodiment；
Fig. 3 f is the training sample that external C phase ground short circuit Wcg occurs in a kind of specific embodiment.
Fig. 4 is the structural schematic diagram that the single busbar two that protected element is bus goes out model into three；
Fig. 5 a is a training sample of specific embodiment median generatrix inside A phase ground short circuit Nag a kind of；
Fig. 5 b is a training sample of specific embodiment median generatrix inside B phase ground short circuit Nbg a kind of；
Fig. 5 c is a training sample of specific embodiment median generatrix inside C phase ground short circuit Ncg a kind of；
One instruction of bus outside A phase ground short circuit when Fig. 5 d is current transformer unsaturation in a kind of specific embodiment
Practice sample；
One instruction of bus outside B phase ground short circuit when Fig. 5 e is current transformer unsaturation in a kind of specific embodiment
Practice sample；
One instruction of bus outside C phase ground short circuit when Fig. 5 f is current transformer unsaturation in a kind of specific embodiment
Practice sample；
One training of bus outside A phase ground short circuit when Fig. 5 g is CT saturation in a kind of specific embodiment
Sample；
One training of bus outside B phase ground short circuit when Fig. 5 h is CT saturation in a kind of specific embodiment
Sample；
One training of bus outside C phase ground short circuit when Fig. 5 i is CT saturation in a kind of specific embodiment
Sample；
The schematic diagram for the two end power supply single loop model of three-phase that Fig. 6 is protected element when being transformer；
Fig. 7 a is the trained sample that transformer occurs that excitation surge current and A phase switching angle are 0 ° in a kind of specific embodiment
This；
Fig. 7 b is the trained sample that transformer occurs that excitation surge current and B phase switching angle are 0 ° in a kind of specific embodiment
This；
Fig. 7 c is the trained sample that transformer occurs that excitation surge current and C phase switching angle are 0 ° in a kind of specific embodiment
This；
Fig. 7 d is an a kind of training sample of A phase ground short circuit outside transformer in specific embodiment；
Fig. 7 e is an a kind of training sample of B phase ground short circuit outside transformer in specific embodiment；
Fig. 7 f is an a kind of training sample of C phase ground short circuit outside transformer in specific embodiment；
Fig. 7 g is a training sample of bushing shell for transformer and lead-out wire A phase ground short circuit in a kind of specific embodiment；
Fig. 7 h is a training sample of bushing shell for transformer and lead-out wire B phase ground short circuit in a kind of specific embodiment；
Fig. 7 i is bushing shell for transformer and lead-out wire C phase one training sample of ground short circuit in a kind of specific embodiment；
Fig. 7 j is an a kind of training sample of transformer A phase turn-to-turn short circuit in specific embodiment；
Fig. 7 k is an a kind of training sample of transformer B phase turn-to-turn short circuit in specific embodiment；
Fig. 7 l is an a kind of training sample of transformer C phase turn-to-turn short circuit in specific embodiment.
Specific embodiment
Core of the invention is to provide a kind of longitudinal protection method, is conducive to the movement speed and standard that improve pilot protection
True property.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Referring to FIG. 1, Fig. 1 is a kind of implementation flow chart of longitudinal protection method in the present invention, this method includes following step
It is rapid:
Step S101: it is pre-configured with the data content for protected element.
Pilot protection for transmission line is common pilot protection, in addition, the scheme of the application can also be applied
On the elements such as generator, bus or transformer.
Transmission line described herein, can be any bar transmission line of electricity in power grid, i.e. the scheme of the application can be with
Apply on any one transmission line of electricity, certainly, after transmission line of electricity has been determined, the acquisition of subsequent training sample and to
The acquisition of measured data is all derived from the transmission line of electricity.Furthermore transmission line is also possible to two end member of the electric system such as distribution line
Part, also, for two-terminal elements such as generators, the scheme of the application, and this Shen can also be applied as transmission line
Scheme please is unrelated with the mode of connection of pilot protection, i.e., the application does not limit the mode of connection.
Applicant in view of intelligent algorithm obtained from rambling data characteristic information ability be it is brilliant,
Therefore pilot protection is carried out using intelligent algorithm, and then key point is to need to configure out in the data for pilot protection
Hold, that is, need to merge the time-domain signals such as voltage, electric current, so that according to the data content of configuration to intelligent algorithm
After being trained, it is that internal fault or outside occurs that intelligent algorithm, which can rapidly and accurately determine protected element,
Failure, and the failure removal for being directed to protected element is executed by pilot protection device in internal fault.
In a kind of specific embodiment of the invention, protected element is transmission line, preconfigured data content
Are as follows:
Three-phase voltage signal u of the first end of the pilot protection device of transmission line in the duration of settinga1, ub1, uc1,
Three-phase current signal ia1, ib1, ic1And line voltage signal uab1, ubc1, uca1In at least six item datas, transmission line it is vertical
Three-phase voltage signal u of the second end of protective device in the duration of settinga2, ub2, uc2, three-phase current signal ia2, ib2, ic2With
And line voltage signal uab2, ubc2, uca2In at least six item datas, altogether at least 12 item datas according to setting sequence combination, and
Including at least the three-phase current signal i of first enda1, ib1, ic1And the three-phase current signal i of second enda2, ib2, ic2。
Such as in a kind of specific occasion, data content are as follows: the first end of the pilot protection device of transmission line is being set
Duration in three-phase voltage signal ua1, ub1, uc1, three-phase current signal ia1, ib1, ic1And the pilot protection of the transmission line
Three-phase voltage signal u of the second end of device in the duration of settinga2, ub2, uc2, three-phase current signal ia2, ib2, ic2Altogether ten
Two item datas according to setting sequence combination.Such selection mode is a kind of more common selection mode, when breaking down
When, it, usually can be relatively accurately it is determined that the internal fault or transmission line of transmission line by this 12 item data
External fault.
In preconfigured data content, all data is combined according to the sequence of setting, and built-up sequence can be any
Setting, such as chosen in the embodiment of 12 item datas above, the built-up sequence of setting can be with are as follows: ua1-ia1-ub1-ib1-
uc1-ic1-ua2-ia2-ub2-ib2-uc2-ic2, the built-up sequence that for another example sets can be with are as follows: ua1-ub1-uc1-ia1-ib1-ic1-ua2-
ub2-uc2-ia2-ib2-ic2, or can be with are as follows: ua1-ub1-uc1-ua2-ub2-uc2-ia1-ib1-ic1-ia2-ib2-ic2Etc.,
Implementation of the invention is not influenced.Certainly, after the built-up sequence setting of all data in data content finishes, subsequent training
Sample and testing data be required to be configured according to identical built-up sequence namely subsequent step described in each training
Sample and testing data will meet the configuration of data content.
In a kind of specific embodiment above-mentioned, the data content of configuration is the first of the pilot protection device of transmission line
The three-phase voltage signal and three-phase current signal at end and the three-phase voltage signal and three-phase current signal of second end, it is contemplated that line
It also include fault message in voltage, therefore in a specific embodiment, it can also be by any one or more phase voltage
It replaces with line voltage, but usually, line voltage can be used uniformly or is used uniformly phase voltage, i.e., common embodiment
In, data content can be with are as follows: three-phase current signal of the first end of the pilot protection device of transmission line in the duration of setting
ia1, ib1, ic1And line voltage signal uab1, ubc1, uca1, the duration of the second end of the pilot protection device of transmission line in setting
Interior three-phase current signal ia2, ib2, ic2And line voltage signal uab2, ubc2, uca2This 12 item data according to setting sequence group
It closes, specific combination can also arbitrarily be set.
When being hereinbefore transmission line for protected element, it is explained explanation to choose ten binomial data instances,
In practical applications, the configuration that more item datas carry out data content can also be chosen, such as chooses transmission line both ends simultaneously
Each phase voltage, each line voltage and each phase current have no effect on implementation of the invention.But it should be recognized that data content
In include data items it is more, the accuracy rate of differentiation is usually higher, but differentiate it is time-consuming natural can improve, applicant passes through experiment
Data and theory analysis, comprehensive distinguishing is time-consuming and from the point of view of differentiating accuracy rate, and a kind of preferred scheme is data content packet
It includes: three-phase voltage signal u of the first end of the pilot protection device of transmission line in the duration of settinga1, ub1, uc1, three-phase electricity
Flow signal ia1, ib1, ic1And three-phase voltage letter of the second end of the pilot protection device of the transmission line in the duration of setting
Number ua2, ub2, uc2, three-phase current signal ia2, ib2, ic2This 12 item data differentiates that accuracy rate is higher and will not occupy too long
It is time-consuming.
The duration of setting, which also can according to need, to be set and is adjusted, and is differentiated required for the duration of setting is longer time-consuming
Naturally more, but the duration set too short may reduce accuracy rate.Comprehensively consider accuracy rate and differentiate it is time-consuming, for being protected
Protection element is transmission line, generator, bus or when transformer, the duration of setting all can be half of cycle, certainly, in portion
Branch can also be chosen for one third cycle, 3/4ths cycles, cycle etc. in closing.
Step S102: acquiring training sample under different fault parameters at the pilot protection device of protected element,
And each training sample of acquisition meets the configuration of data content.
It has been pre-configured with after the data content for protected element, it can be according to the data content of configuration, not
The acquisition of sample is trained under same fault parameter from the pilot protection device of protected element.
Still by taking protected element is transmission line as an example, reference can be made to Fig. 2, Fig. 2 are the structural schematic diagram of two end model of three-phase,
System frequency is 50Hz, and the voltage of system busbar Bus1, Bus2 and Bus3 are 220kV.Transmission line Line1 and transmission
The length of route Line2 is 200km.The positive sequence impedance of transmission line is Z1=5.38+j84.5 Ω, zero sequence impedance Z0=
64.82+j209.53 Ω, the source impedance of two sides is Zs=9.19+j74.76 Ω.
Protected element is transmission line Line2, and the first end of pilot protection device is on the right side of the Bus2 of Fig. 2, second
End is on the left of the Bus3 of Fig. 2, data sampling frequency 10kHz, i.e., a frequency cycle acquires 200 points.For transmission line
For Line2, the failure occurred in Line2 is internal fault, and the failure occurred outside Line2 is external fault.
Such as the data content of configuration are as follows: ua1-ia1-ub1-ib1-uc1-ic1-ua2-ia2-ub2-ib2-uc2-ic2, setting when
A length of half of cycle.For the embodiment of Fig. 2, a training sample has 12 channels, and each channel takes 100 points
According to that is, a training sample shares 1200 point datas, is properly termed as 1200 dimensions.It is trained under different fault parameters
The acquisition of sample, the training samples number of acquisition, which can according to need, to be set and is chosen, and the training samples number of acquisition is got over
More, the accuracy of the intelligent algorithm after training is higher.
It can be trained by fault parameters such as generator rotor angle, fault types before change fault distance, failure insertion angle, failure
The acquisition of sample, and it should be noted that due to needing to carry out protected element using the intelligent algorithm after training
The differentiation of inside and outside portion's failure, and then pilot protection movement excision fault element when internal fault, therefore in order to guarantee higher standard
True rate, when acquiring training sample, it should have the training sample that all kinds of failures inside protected element occur and generation
In the training sample of all kinds of failures of the outside of protected element.
Fig. 3 a is that the protected element of Fig. 2 is in the embodiment of transmission line Line2, and the internal A phase of generation is grounded short
A training sample of road Nag, Fig. 3 b and Fig. 3 c be respectively occur a training sample of internal B phase ground short circuit Nbg with
And a training sample of internal C phase ground short circuit Ncg occurs.The protected element that Fig. 3 d is Fig. 2 is transmission line Line2
A training sample of external (on the left of Bus2) A phase ground short circuit Wag occurs in embodiment, Fig. 3 e and Fig. 3 f are respectively to send out
A training sample of raw external B phase ground short circuit Wbg and the training sample that external C phase ground short circuit Wcg occurs.
Step S103: by each training sample input into preset intelligent algorithm to be carried out to intelligent algorithm
Training.
The training samples number of acquisition, which can according to need, to be set and is chosen, for different protected elements, instruction
The collecting quantity for practicing sample can be adaptably different.Such as the protected element of Fig. 2 be transmission line embodiment in, can
Intelligent algorithm is trained with acquiring 60 training samples.In the embodiment of Fig. 6,840 training samples are acquired.
In view of the data dimension of the application is higher, such as there is 1200 dimensions, artificial intelligence in a kind of aforementioned embodiment
Energy algorithm can specifically be chosen for being suitable for group rarefaction representation algorithm (the group sparse of high dimensional data processing
representation).Certainly, other kinds of intelligent algorithm can also be chosen in concrete application, such as convolution is sparse
Autocoder, extreme learning machine etc. have preferable identification.
Step S104: testing data is acquired from the pilot protection device of protected element, and testing data meets data
The configuration of content.
As training sample, testing data is also required to be acquired according to the data content of configuration, such as the implementation of Fig. 2
In mode, the testing data of acquisition can be the u of half of cyclea1, ub1, uc1, ia1, ib1, ic1, ua2, ub2, uc2, ia2, ib2, ic2。
Step S105: testing data is input to the intelligent algorithm after training, when determining protected element
When internal fault, the failure removal for being directed to protected element is executed by pilot protection device.
Testing data is input to the intelligent algorithm after training, the intelligent algorithm after training can be sentenced automatically
Not haveing protected element, whether failure and failure are internal fault or external fault, are determining protected element
When internal fault, the failure removal for being directed to protected element can be executed by pilot protection device.
Such as when protected element is transmission line, if testing data is the data acquired after failure, after training
Intelligent algorithm can be from internal A phase ground short circuit, inside B phase ground short circuit, inside C phase ground short circuit, inside AB two
Mutually short circuit, inside AC line to line fault, internal BC line to line fault, inside AB two-phase grounding fault, inside AC two-phase grounding fault are interior
Portion's BC two-phase grounding fault, inside ABC three-phase shortcircuit, external A phase ground short circuit, outside B phase ground short circuit, outside C phase are grounded
Short circuit, outside AB line to line fault, external AC line to line fault, external BC line to line fault, outside AB two-phase grounding fault, external AC two
Phase ground short circuit in external BC two-phase grounding fault, outside ABC three-phase shortcircuit this 20 kinds of fault conditions, determines that correspond to should
The case where testing data, and then pilot protection can be carried out if it is internal fault, i.e., the transmission line is cut off.
Using technical solution provided by the embodiment of the present invention, comprising: be pre-configured in the data for protected element
Hold；Training sample, and each instruction acquired are acquired at the pilot protection device of protected element under different fault parameters
Practice the configuration that sample standard deviation meets data content；By each training sample input into preset intelligent algorithm to artificial intelligence
Energy algorithm is trained；Testing data is acquired from the pilot protection device of protected element, and testing data meets in data
The configuration of appearance；Testing data is input to the intelligent algorithm after training, internal fault occurs when determining protected element
When, the failure removal for being directed to protected element is executed by pilot protection device.
In the scheme of the application, pilot protection is realized by intelligent algorithm.It is protected specifically, being pre-configured with and being directed to
The data content of element, under different fault parameters at the pilot protection device of protected element acquire training sample it
Afterwards, preset intelligent algorithm is trained by training sample, the intelligent algorithm after training is differentiated
Protected element is happens is that internal fault or external fault out.Therefore, it is adopted from the pilot protection device of protected element
After collecting testing data, when the intelligent algorithm after training determines protected element generation internal fault, it can pass through
Pilot protection device executes the failure removal for being directed to protected element.Compared to traditional scheme, due to it is not necessary that time-domain signal is turned
It is changed to frequency-region signal, therefore advantageously reduces differentiation time-consuming, is conducive to the movement speed for improving pilot protection.And artificial intelligence is calculated
Method is by after training, having accurate identification result.Therefore, the scheme of the application is conducive to improve the movement speed of pilot protection
Degree and accuracy.
In a kind of specific embodiment of the invention, protected element is the system busbar with N number of port, and N is positive
Integer, preconfigured data content are as follows:
Three-phase voltage signal u of the pilot protection device of bus in the duration of settinga, ub, ucAnd bus is vertical
Three-phase current signal of the every one end of protective device in the duration of setting according to setting sequence combination, or are as follows: bus
Line voltage signal u of the pilot protection device in the duration of settingab, ubc, ucaAnd the pilot protection device of bus is each
Hold the three-phase current signal in the duration of setting according to the combination of setting sequence.
Applicant considers that the electric current time-domain signal respectively held using the voltage time-domain signal and bus of bus is (i.e. if each
It is then internal fault that end, which is determined as positive direction short circuit, is external fault if at least one end is determined as opposite direction short circuit),
Inside and outside failure can be relatively accurately determined, therefore the data content configured is the pilot protection device of bus in setting
Three-phase voltage signal u in durationa, ub, ucAnd three-phase of the every one end of the pilot protection device of bus in the duration of setting
According to the combination of setting sequence, built-up sequence can arbitrarily set current signal, not influence implementation of the invention.Certainly, with
Hereinbefore protected element be transmission line description similarly, the setting of the built-up sequence of all data in data content finishes it
Afterwards, subsequent training sample and testing data are required to be configured according to identical built-up sequence.
Similarly with transmission line embodiment above, in the specific implementation, the bus that can also will be configured in data content
Three-phase voltage signal ua, ub, ucIn any one or more replace with line voltage signal uab, ubc, uca, and usually,
Line voltage can be used uniformly or be used uniformly phase voltage, i.e., in common embodiment, data content can be with are as follows: bus it is vertical
Line voltage signal u of the UNPROFOR protection unit in the duration of settingab, ubc, ucaAnd every one end of the pilot protection device of bus
According to the combination of setting sequence, specific combination can arbitrarily be set for three-phase current signal in the duration of setting.When
So, in practical applications, the configuration that more item datas carry out data content can also be chosen, such as chooses bus three-phase electricity simultaneously
Pressure and line voltage, have no effect on implementation of the invention.But it should be recognized that the data items for including in data content are got over
More, the accuracy rate of differentiation is usually higher, but differentiates that time-consuming nature can improve, and applicant passes through experimental data and theory analysis,
Comprehensive distinguishing is time-consuming and from the point of view of differentiating accuracy rate, and it includes u that a kind of preferred scheme, which is data content,a, ub, ucAnd bus
Pilot protection device three-phase current signal of every one end in the duration of setting, there is certain differentiation accuracy rate and will not
Occupy too long time-consuming.
In a kind of specific embodiment of the invention, in data content further include: the electric current summation letter of three-phase respectively held
Number iaz, ibz, icz, wherein iazFor the sum of the A phase current of N number of port of the pilot protection device in the duration of setting of bus,
ibzFor the sum of the B phase current of N number of port of the pilot protection device in the duration of setting of bus, iczFor the vertical UNPROFOR of bus
The sum of the C phase current of N number of port of the protection unit in the duration of setting.
It is illustrated by taking Fig. 4 as an example, in the embodiment of Fig. 4, bus is the bus having there are five port, then iaz=ia1+
ia2+ia3+ia4+ia5, ia1To ia5It is followed successively by the A phase current at the 1st end to the 5th end of the bus, correspondingly, 5 ports of B phase
Electric current summing signal ibz=ib1+ib2+ib3+ib4+ib5, the electric current summing signal i of 5 ports of C phasecz=ic1+ic2+ic3+ic4+
ic5。
Fig. 4 goes out model into three for single busbar two, and system frequency is 50Hz, generator voltage 230kV, internal impedance RLC
Series model, resistance are 1 Ω, and inductance 0.1H, capacitor is 1.0 μ F.Transmission line Line1, Line2 and Line3 length is
200km, three-phase transmission route do not replace.Transmission line positive sequence impedance is Z1=5.38+j84.5 Ω, zero sequence impedance Z0
=64.82+j209.53 Ω.Data sampling frequency is 10kHz, i.e., a frequency cycle acquires 200 points, the vertical UNPROFOR of bus
5 ports of protection unit are 5 ports of the bus, are indicated in Fig. 4 with 5 boxes.All data in data content
Built-up sequence can arbitrarily be set, such as can be with are as follows:
ua-ub-uc-ia1-ib1-ic1-ia2-ib2-ic2-ia3-ib3-ic3-ia4-ib4-ic4-ia5-ib5-ic5-iaz-ibz-icz,
And the duration set is, for example, half of cycle.Then for the embodiment of Fig. 4, a training sample has 21 channels,
Each channel takes 100 point datas, i.e. a training sample shares 2100 point datas.It is instructed under different fault parameters
Practice the acquisition of sample, such as external fault, can be joined by changing the failures such as transmission line malfunction distance, failure insertion angle
Number can adopt internal fault by fault parameters such as generator rotor angles before change bus-bar fault insertion angle, failure come output data
The training samples number of collection, which also can according to need, to be set and is chosen, and the training samples number of acquisition is more, after training
The accuracy of intelligent algorithm is higher.
It is emphasized that due in a specific embodiment, including in the data content of configuration: three-phase it is each
The electric current summing signal i at endaz, ibz, icz, and iaz, ibz, iczCan the inside and outside portion's failure of subsidiary discriminant because occur internal fault
When failure phase electric current increase, therefore this kind of embodiment be conducive to improve differentiate accuracy rate.Also, in traditional scheme, warp
Often will appear the case where external fault is mistaken for internal fault caused by CT saturation, in this kind of embodiment due to
It joined iaz, ibz, icz, the temporal aspect between the three-phase current signal of every one end, which can embody current transformer, is
No saturation, therefore be conducive to avoid occurring in CT saturation is mistaken for internal fault for external fault, causes to protect
The case where shield malfunction.Certainly, in this kind of embodiment, it usually needs in the condition of bus external fault CT saturation
Under, the acquisition of a part of training sample is carried out, and then be trained to intelligent algorithm, i.e. difference described in step S102
The acquisition of training sample under fault parameter, it should include the case where bus external fault CT saturation, so that
After training, testing data in response to this obtains accurately as a result, in will not being mistaken for intelligent algorithm
Portion's failure causes protection misoperation.
Fig. 5 a is that the protected element of Fig. 4 is bus, and the built-up sequence that sets in the data content configured are as follows:
ua-ub-uc-ia1-ib1-ic1-ia2-ib2-ic2-ia3-ib3-ic3-ia4-ib4-ic4-ia5-ib5-ic5-iaz-ibz-iczEmbodiment
In, a training sample of internal A phase ground short circuit Nag occurs, Fig. 5 b and Fig. 5 c are respectively to occur in this kind of embodiment
A training sample of internal B phase ground short circuit Nbg and the training sample that internal C phase ground short circuit Ncg occurs.Fig. 5 d
For in this kind of embodiment occur current transformer unsaturation when outside A phase ground short circuit a training sample, Fig. 5 e and
Fig. 5 f is respectively one training sample of outside B phase ground short circuit and generation Current Mutual Inductance when current transformer unsaturation occurs
One training sample of outside C phase ground short circuit when device unsaturation, Fig. 5 g, Fig. 5 h and Fig. 5 i are followed successively by this kind of embodiment
Outside A phase ground short circuit when CT saturation occurs, outside B phase ground short circuit and electric current are mutual when CT saturation
One training sample of outside C phase ground short circuit when sensor is saturated.
When protected element is bus, if testing data is the data acquired after failure, the artificial intelligence after training
Energy algorithm can be short from the A phase ground short circuit in inside and outside portion, B phase ground short circuit, C phase ground short circuit, AB line to line fault, AC two-phase
Road, BC line to line fault, AB two-phase grounding fault, AC two-phase grounding fault, this 20 kinds of BC two-phase grounding fault, ABC three-phase shortcircuit
In fault condition, the case where determining corresponding to the testing data, and then the vertical of bus may be implemented if it is internal fault
Protection.
In a kind of specific embodiment of the invention, protected element is the transformer with M winding, and M is positive whole
Number, preconfigured data content are as follows:
Three-phase voltage signal of each side of transformer in the duration of setting, duration of each side of transformer in setting
Interior three-phase current signal, the transformer neutral point are directly grounded the current signal held in the duration of setting, the transformation
The three-phase of the device three-phase current summing signal of each side and the transformer each side in the duration of setting in the duration of setting
Voltage summing signal according to setting sequence combination.
Commonly the value of doublewound transformer perhaps three-winding transformer, that is, M is usually 2 or 3.If it is
The high-pressure side of transformer can be then labeled as the side I by double winding, and low-pressure side is labeled as the side II, uaΙ, ubΙAnd ucΙAs transformation
Three-phase voltage signal of the high-pressure side of device in the duration of setting；iaΙ, ibΙAnd icΙAs the high-pressure side of the transformer is being set
Duration in three-phase current signal, correspondingly, uaΠ, ubΠAnd ucΠFor transformer low-pressure side in the duration of setting three
Phase voltage signal；iaΠ, ibΠAnd icΠFor three-phase current signal of the low-pressure side in the duration of setting of transformer.For three around
Group, can be by the high-pressure side of transformer, and low-pressure side, medium voltage side is successively labeled as side I, II, III etc., and Fig. 6 is with two-winding transformer
For be illustrated, the transformer of other windings is therewith referring to can just not repeated explanation.
Due to include in the data content of configuration three-phase voltage signal of each side of transformer in the duration of setting and
Three-phase current signal of each side of transformer in the duration of setting, the intelligent algorithm after enabling to training are with higher
Accuracy rate effectively carries out pilot protection to transformer.
Also, applicant easily causes erroneous judgement in view of excitation surge current, and by being directly grounded end to transformer neutral point
Current signal in the duration of setting, the three-phase current summing signal of each side of transformer and the three-phase voltage of each side of transformer
The identification of summing signal can effectively distinguish the difference of excitation surge current Yu transformer short-circuit electric current, therefore in data content
It is configured with transformer neutral point and is directly grounded the current signal held in the duration of setting, transformer each side in the duration of setting
Three-phase current summing signal and transformer each side in the duration of setting three-phase voltage summing signal.
It further, in a specific embodiment can also include: duration of the transformer in setting in data content
Each side electric current summing signal of interior three-phase is conducive to the sensitivity for improving transformer pilot protection.Certainly, with hereinbefore protected
Element is bus, transmission line is the same, and when protected element is transformer, the data content no matter configured is by which item data structure
At can arbitrarily setting built-up sequence in advance.
Transformer neutral point is directly grounded the winding for holding the current signal in the duration of setting to depend on transformer and connects
Group, such as in the embodiment of Fig. 6, transformer is two-winding transformer and winding coupling group is YN-d11, then become
The electric current time-domain signal at depressor neutral-point solid ground end is inΙ.For another example transformer winding connection set is in a kind of specific occasion
YN-YN-d11, then current signal of the neutral-point solid ground end in the duration set is inΙAnd inΠ。
Fig. 6 is two end power supply single loop model of three-phase, and system frequency is 50Hz, and transmission line Line1 length is 200km,
Three-phase transmission route does not replace.Transmission line positive sequence impedance is Z1=5.38+j84.5 Ω, zero sequence impedance Z0=64.82
+ j209.53 Ω, sinistral power voltage rating are 230kV, and capacity 100MVA, east power voltage rating is 115kV, two sides
Source impedance is R-R ∥ L model, wherein series connection R=1 Ω, R=1 Ω in parallel, inductance L=0.1H, transformer nominal transformation ratio are
230kV/115kV, connection YN-d11.The pilot protection device of transformer, or referred to as protective relaying device is arranged in Fig. 6's
At two red boxes, high-pressure side and the low-pressure side of transformer are respectively indicated.Data sampling frequency is set as 10kHz, i.e., one
Frequency cycle acquires 200 points.
iaz, ibzAnd iczFor each side electric current summing signal of transformer three-phase in the duration of setting, due to being that Fig. 6 is
Two-winding transformer, therefore each side electric current summing signal i of A phaseaz=iaΙ+iaΠ, correspondingly, each side electric current summing signal of B phase
ibz=ibΙ+ibΠ, each side electric current summing signal i of C phasecz=icΙ+icΠ。
In the embodiment of Fig. 6, uXΙAnd uXΠFor the three-phase voltage summing signal of transformer each side in the duration of setting,
Wherein uXΙFor the three-phase voltage summing signal of high voltage side of transformer, uXΙ=uaΙ+ubΙ+ucΙ, uXΠThe three-phase electricity of step down side
Press summing signal, uXΠ=uaΠ+ubΠ+ucΠ；iXΙAnd iXΠFor the three-phase current summation letter of transformer each side in the duration of setting
Number, wherein iXΙFor the three-phase current summing signal of high voltage side of transformer, iXΙ=iaΙ+ibΙ+icΙ, iXΠIt is the three of step down side
Phase current summing signal, iXΠ=iaΠ+ibΠ+icΠ。
Such as preset built-up sequence can be with are as follows:
uaΙ-iaΙ-ubΙ-ibΙ-ucΙ-icΙ-uaΠ-iaΠ-ubΠ-ibΠ-ucΠ-icΠ-inΙ-iaz-ibz-icz-uXΙ-iXΙ-uXΠ-iXΠ
One training sample has 20 channels, and each channel takes 100 point datas, i.e. a training sample shares 2000
Point data, referred to as 2000 dimensions.The acquisition of sample is trained under different fault parameters, the training samples number of acquisition can
To be set and be chosen as needed, the training samples number of acquisition is more, the accuracy of the intelligent algorithm after training
It is higher.
The internal fault of transformer generally includes turn-to-turn short circuit, phase fault and ground short circuit, and the turn-to-turn of internal fault is short
Road can account for primary winding percentage by changing winding, the short-circuited winding of generation turn-to-turn short circuit, failure is inserted into function before angle and failure
The fault parameters such as angle acquire training sample.The phase fault and ground short circuit of internal fault can be inserted by changing bus-bar fault
Enter generator rotor angle before angle, failure, the fault parameters such as fault type acquire training sample.The external fault of transformer can pass through change
Transmission line malfunction distance, failure insertion angle, generator rotor angle before failure, etc. fault parameters acquire training sample.Also need to illustrate
It is in order to preferably avoid that excitation surge current is mistaken for short circuit current, that is, to avoid the intelligent algorithm from being for magnetizing inrush current discrimination
Failure should also have the training sample that excitation surge current occurs when acquiring training sample, so that the artificial intelligence after training is calculated
Method has more accurate discrimination.Excitation surge current can be by changing the idle-loaded switching-on angle of each phase come output data.
Fig. 7 a is that the protected element of Fig. 6 is transformer, and the built-up sequence that sets in the data content configured are as follows:
uaΙ-iaΙ-ubΙ-ibΙ-ucΙ-icΙ-uaΠ-iaΠ-ubΠ-ibΠ-ucΠ-icΠ-inΙ-iaz-ibz-icz-uXΙ-iXΙ-uXΠ-iXΠ
Embodiment in, the training sample that excitation surge current and A phase switching angle are 0 ° occurs, Fig. 7 b and Fig. 7 c are respectively this kind
Excitation surge current and B phase switching angle occur in embodiment to close a floodgate for 0 ° of a training sample and generation excitation surge current and C phase
The training sample that angle is 0 °.Fig. 7 d, Fig. 7 e and Fig. 7 f be followed successively by this kind of embodiment occur external A phase be grounded it is short
One training sample of road, B phase ground short circuit and C phase ground short circuit, Fig. 7 g, Fig. 7 h and Fig. 7 i are followed successively by this kind of embodiment party
A trained sample of bushing shell for transformer and lead-out wire A phase ground short circuit, B phase ground short circuit and C phase ground short circuit occurs in formula
This.Fig. 7 j, Fig. 7 k and Fig. 7 l be followed successively by this kind of embodiment occur the turn-to-turn short circuit of transformer A phase, the turn-to-turn short circuit of B phase and
One training sample of C phase turn-to-turn short circuit.
In a kind of specific embodiment of the invention, it is contemplated that the voltage measured in the occasion of part is unfavorable for close to 0
The case where internal and external fault differentiates, easily causes erroneous judgement, therefore suitably nominal voltage amplitude, i.e. voltage data can select
It is taken as per unit value.
Corresponding to above method embodiment, the embodiment of the invention also provides a kind of pilot protection system, can with it is above
Reference is corresponded to each other, which may include:
Data content configuration module, for being pre-configured with the data content for being directed to protected element；
Training sample acquisition module, for being adopted at the pilot protection device of protected element under different fault parameters
Collect training sample, and each training sample acquired meets the configuration of data content；
Training module, for by each training sample input into preset intelligent algorithm to intelligent algorithm
It is trained；
Testing data acquisition module, for acquiring testing data from the pilot protection device of protected element, and it is to be measured
The configuration of data fit data content；
Pilot protection module is protected for testing data to be input to the intelligent algorithm after training when determining
When internal fault occurs for element, the failure removal for being directed to protected element is executed by pilot protection device.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand technical solution of the present invention and its core concept.It should be pointed out that for the common of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for technical staff, these
Improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (10)
1. a kind of longitudinal protection method characterized by comprising
It is pre-configured with the data content for protected element；
Training sample is acquired at the pilot protection device of the protected element under different fault parameters, and is acquired every
A training sample meets the configuration of the data content；
By each training sample input into preset intelligent algorithm to be trained to the intelligent algorithm；
Testing data is acquired from the pilot protection device of the protected element, and the testing data meets the number
According to the configuration of content；
The testing data is input to the intelligent algorithm after training, internal event occurs when determining the protected element
When barrier, the failure removal for being directed to the protected element is executed by the pilot protection device.
2. longitudinal protection method according to claim 1, which is characterized in that the protected element is transmission line, in advance
The data content first configured are as follows:
Three-phase voltage signal u of the first end of the pilot protection device of the transmission line in the duration of settinga1, ub1, uc1,
Three-phase current signal ia1, ib1, ic1And line voltage signal uab1, ubc1, uca1In at least six item datas, the transmission line
Three-phase voltage signal u of the second end of pilot protection device in the duration of settinga2, ub2, uc2, three-phase current signal ia2,
ib2, ic2And line voltage signal uab2, ubc2, uca2In at least six item datas, altogether at least 12 item datas according to setting sequence
Combination, and include at least first end the three-phase current signal ia1, ib1, ic1And the three-phase current letter of second end
Number ia2, ib2, ic2。
3. longitudinal protection method according to claim 2, which is characterized in that the data content are as follows: the transmission line
Pilot protection device three-phase voltage signal u of the first end in the duration of settinga1, ub1, uc1, three-phase current signal ia1,
ib1, ic1, three-phase voltage signal u of the second end of the pilot protection device of the transmission line in the duration of settinga2,
ub2, uc2, three-phase current signal ia2, ib2, ic2According to the combination of setting sequence, and the built-up sequence set are as follows: ua1-ia1-ub1-
ib1-uc1-ic1-ua2-ia2-ub2-ib2-uc2-ic2。
4. longitudinal protection method according to claim 1, which is characterized in that the protected element is with N number of port
System busbar, N is positive integer, the preconfigured data content are as follows:
Three-phase voltage signal u of the pilot protection device of the bus in the duration of settinga, ub, ucAnd the bus
Three-phase current signal of the every one end of the pilot protection device in the duration of setting according to setting sequence combination, or
Are as follows: line voltage signal u of the pilot protection device of the bus in the duration of settingab, ubc, ucaAnd the bus
The pilot protection device three-phase current signal of every one end in the duration of setting according to setting sequence combination.
5. longitudinal protection method according to claim 4, which is characterized in that in the data content further include: three-phase
The electric current summing signal i respectively heldaz, ibz, icz, wherein iazFor the bus the pilot protection device in the duration of setting
N number of port A phase current sum, ibzFor N number of port of the pilot protection device in the duration of setting of the bus
B phase current sum, iczFor the C phase current of N number of port of the pilot protection device in the duration of setting of the bus
Sum.
6. longitudinal protection method according to claim 5, which is characterized in that the bus is that there are five the mothers of port for tool
Line, the preconfigured data content are as follows:
Three-phase voltage signal u of the pilot protection device of the bus in the duration of settinga, ub, uc, the bus it is described
The electric current summing signal of three-phase current signal and three-phase of the every one end of pilot protection device in the duration of setting respectively held
iaz, ibz, iczAccording to the combination of setting sequence, and the built-up sequence set are as follows:
ua-ub-uc-ia1-ib1-ic1-ia2-ib2-ic2-ia3-ib3-ic3-ia4-ib4-ic4-ia5-ib5-ic5-iaz-ibz-icz；Wherein,
iaz=ia1+ia2+ia3+ia4+ia5, ibz=ib1+ib2+ib3+ib4+ib5, icz=ic1+ic2+ic3+ic4+ic5。
7. longitudinal protection method according to claim 1, which is characterized in that the protected element is with M winding
Transformer, M is positive integer, the preconfigured data content are as follows:
Three-phase voltage signal of each side of transformer in the duration of setting, each side of transformer is in the duration of setting
Three-phase current signal, the transformer neutral point are directly grounded the current signal held in the duration of setting, and the transformer exists
The three-phase voltage of the three-phase current summing signal of each side and the transformer each side in the duration of setting in the duration of setting
Summing signal according to setting sequence combination.
8. longitudinal protection method according to claim 7, which is characterized in that in the data content further include: the change
Each side electric current summing signal of depressor three-phase in the duration of setting.
9. longitudinal protection method according to claim 8, which is characterized in that the transformer be two-winding transformer and around
Group connection set is YN-d11；
In preset data content, the built-up sequence of setting are as follows:
uaΙ-iaΙ-ubΙ-ibΙ-ucΙ-icΙ-uaΠ-iaΠ-ubΠ-ibΠ-ucΠ-icΠ-inΙ-iaz-ibz-icz-uXΙ-iXΙ-uXΠ-iXΠ；
Wherein, uaΙ, ubΙAnd ucΙFor three-phase voltage signal of the high-pressure side in the duration of setting of the transformer；iaΙ, ibΙWith
And icΙFor three-phase current signal of the high-pressure side in the duration of setting of the transformer；uaΠ, ubΠAnd ucΠFor the transformation
Three-phase voltage signal of the low-pressure side of device in the duration of setting；iaΠ, ibΠAnd icΠIt is being set for the low-pressure side of the transformer
Three-phase current signal in fixed duration；inΙThe electric current letter held in the duration of setting is directly grounded for the transformer neutral point
Number；iaz, ibzAnd iczFor each side electric current summing signal of transformer three-phase in the duration of setting, wherein iaz=iaΙ+
iaΠFor each side electric current summing signal of A phase, ibz=ibΙ+ibΠFor each side electric current summing signal of B phase, icz=icΙ+icΠFor C phase
Each side electric current summing signal；uXΙAnd uXΠFor the three-phase voltage summing signal of the transformer each side in the duration of setting,
Middle uXΙFor the three-phase voltage summing signal of the high voltage side of transformer, uXΙ=uaΙ+ubΙ+ucΙ, uXΠThe step down side
Three-phase voltage summing signal, uXΠ=uaΠ+ubΠ+ucΠ；iXΙAnd iXΠFor the three-phase current summing signal of each side of the transformer,
Middle iXΙFor the three-phase current summing signal of the high voltage side of transformer, iXΙ=iaΙ+ibΙ+icΙ, iXΠFor the step down side
Three-phase current summing signal, iXΠ=iaΠ+ibΠ+icΠ。
10. a kind of pilot protection system characterized by comprising
Data content configuration module, for being pre-configured with the data content for being directed to protected element；
Training sample acquisition module, for being adopted at the pilot protection device of the protected element under different fault parameters
Collect training sample, and each training sample acquired meets the configuration of the data content；
Training module, for by each training sample input into preset intelligent algorithm to the artificial intelligence
Algorithm is trained；
Testing data acquisition module, for acquiring testing data from the pilot protection device of the protected element, and
The testing data meets the configuration of the data content；
Pilot protection module, for the testing data to be input to the intelligent algorithm after training, when determining the quilt
When internal fault occurs for protection element, the failure removal for being directed to the protected element is executed by the pilot protection device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114142605A (en) * | 2021-11-09 | 2022-03-04 | 广东工业大学 | Pilot protection method, device and storage medium |
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| US3223891A (en) * | 1961-12-20 | 1965-12-14 | Kenneth R Mcclymont | Pilot-wire protection of transmission lines |
| CN103795030A (en) * | 2014-01-15 | 2014-05-14 | 山东大学 | Transformer relay protection method based on longitudinal branch connection conductance |
| CN105445613A (en) * | 2015-09-29 | 2016-03-30 | 昆明理工大学 | Line fault identification method based on epipolar voltage machine learning discrimination mechanism |
| CN106203382A (en) * | 2016-07-20 | 2016-12-07 | 河海大学 | A kind of excitation surge current based on kernel function extreme learning machine and fault current recognition methods |
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| US3223891A (en) * | 1961-12-20 | 1965-12-14 | Kenneth R Mcclymont | Pilot-wire protection of transmission lines |
| CN103795030A (en) * | 2014-01-15 | 2014-05-14 | 山东大学 | Transformer relay protection method based on longitudinal branch connection conductance |
| CN105445613A (en) * | 2015-09-29 | 2016-03-30 | 昆明理工大学 | Line fault identification method based on epipolar voltage machine learning discrimination mechanism |
| CN106203382A (en) * | 2016-07-20 | 2016-12-07 | 河海大学 | A kind of excitation surge current based on kernel function extreme learning machine and fault current recognition methods |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114142605A (en) * | 2021-11-09 | 2022-03-04 | 广东工业大学 | Pilot protection method, device and storage medium |
| US11756352B2 (en) | 2021-11-09 | 2023-09-12 | Guangdong University Of Technology | Pilot protection method, device and storage medium |
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