CN108711821B - A kind of flexible direct current bridge arm differential protection automatic test approach - Google Patents
A kind of flexible direct current bridge arm differential protection automatic test approach Download PDFInfo
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- CN108711821B CN108711821B CN201810326682.3A CN201810326682A CN108711821B CN 108711821 B CN108711821 B CN 108711821B CN 201810326682 A CN201810326682 A CN 201810326682A CN 108711821 B CN108711821 B CN 108711821B
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- protection
- differential protection
- bridge arm
- direct current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
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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
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Abstract
The present invention discloses a kind of flexible direct current bridge arm differential protection from dynamic measuring method; by manually importing soft straight protection bridge arm differential protection logic definite value; short trouble calculating is carried out automatically according to protection definite value and protection act equation; each size for surveying current value, makes it meet differential protection action message condition needed for reasonable disposition differential protection calculates after calculating.Differential protection test module applies the current signal for meeting differential protection movement to soft straight protection; and by obtain the soft protection exit information directly protected judge differential protection act whether action message; simultaneously; T1 and T2 at the time of obtaining protection exit, automatic calculating protection exit time are at the time of applying differential protection fault current by comparing | T2-T1 |.Technical solution of the present invention reduces the links such as artificial progress saturation logic analysis, fixed value calculation, greatly improves testing efficiency.
Description
Technical field
The present invention relates to flexible direct current converter stations to control protection technique field, in particular to a kind of flexible direct current bridge arm is differential
Protect automatic test approach.
Background technique
With the development of power electronic devices technology, flexible DC transmission is had begun from theory stage into practical application
Stage.At home, it is flexible straight that the first in the world multiterminal have been built up in 2013 using Southern Power Grid Company as the power grid enterprises of representative
Stream transmission of electricity demonstration project -- Nan'ao ± 160kV Multi-end flexible direct current transmission engineering.The most important link technology of flexible DC transmission
It is the AC-DC conversion i.e. construction of converter station, and the control core of converter station is flexible direct current control protective unit.Flexible direct current
Control protective unit mainly protects five regions, is harmonics area, ac bus protection zone (starting-up later time area), the change of current respectively
Device protection zone, direct current protecting area and DC convergent current bus bar protection zone.Harmonics area generallys use electromagnetic transformer, protects voltage
Current sampling signal is ac analog, and protective device relies primarily on conventional AC protective relaying device.Change of current protection zone, direct current
Protection zone and direct current confluence protection zone mainly use electric mutual inductor, protect voltage and current sampled signal for high-speed figure FT3 report
Text.And ac bus protection zone is the conversion stage of exchange with direct current, the existing ac analog voltage of protective device sampled signal
Current signal also has the voltage and current signal of high-speed figure FT3 message.
Main protection of the bridge arm differential protection as change of current area, differential current computing need to acquire the three-phase current letter of upper and lower bridge arm
Number and positive and negative anodes current signal.The differential sampled signal of bridge arm is mainly high speed FT3 signal, and the country is in technique and instrument at present
Also in blank stage on equipment research.Therefore the logic service work of flexible direct current bridge arm differential protection can't temporarily change again
Stream station scene is carried out, and can only carry out simulating, verifying in relevant laboratory.
Summary of the invention
The main object of the present invention is to propose a kind of flexible direct current bridge arm differential protection automatic test approach, it is intended to overcome with
Upper problem.
To achieve the above object, a kind of flexible direct current bridge arm differential protection automatic test approach proposed by the present invention, it is special
Sign is, includes the following steps:
The virtual protection definite value of S1 setting differential protection automatic test module bridge arm differential protection operation equation；
Virtual protection definite value described in S2 imports flexible direct current and protects test macro；
S3 sets fault type as short trouble；
S4 starts the operation of flexible direct current protection bridge arm differential protection movement；
S5 carries out differential protection calculating；
S6 configures the current value size of various tests needed for differential protection calculates, and the differential protection for simulating short trouble is reliable
Operation condition；
S7 differential protection automatic test module applies the current signal for meeting differential protection movement to flexible direct current protection, and
By obtain flexible direct current protection protection exit information judge differential protection act whether action message；
If S8 is above-mentioned to be judged as action message, T1 and acquisition are protected at the time of applying differential protection fault current by comparison
T2 at the time of shield outlet, automatic to calculate the protection exit time | T2-T1 |；Otherwise set protection definite value is checked, into S2；
S9 test terminates.
Preferably, the bridge arm differential protection operation equation are as follows:
|Ibpa+Ibpb+Ibpc-Idp| > Δ or | Ibna+Ibnb+Ibnc-Idn| > Δ,
Wherein Ibp、IdPFor upper bridge arm three-phase current and direct-flow positive pole electric current, Ibn、IdnFor lower bridge arm three-phase current and direct current
Cathodal current, △ are differential protection definite value, set differential protection definite value △ as Ip, and calculating is poor after importing differential automatic test module
Dynamic protection action message time difference stream should be Im, and poor stream of being reliably failure to actuate should be In.
Preferably, the upper bridge arm differential protection movement is simulated, then Im=| Ibpa+Ibpb+Ibpc–Idp|, flexible direct current protection
Test macro, which protects flexible direct current at the T1 moment, applies current signal, i.e., upper bridge arm A phase current Ibpa, upper bridge arm B phase current
Ibpb, upper bridge arm C phase current Ibpc, direct-flow positive pole electric current Idp, the upper bridge arm differential protection operation condition Im=of output CT signal satisfaction |
Ibpa+Ibpb+Ibpc–Idp|。
Preferably, the movement outlet of the differential protection movement is that direct current system is required to stop transport and/or trip and lock friendship
Flow the on-off model of breaker.
Preferably, the hard contact intake of the flexible direct current protection test macro obtains the outlet information at the T2 moment,
Then differential protection Outlet time is | T2-T1 |, after obtaining trip protection outlet information, differential protection module is out of service and automatic
It provides bridge arm differential protection movement outlet and calculates movement Outlet time.
Preferably, simulate the upper bridge arm differential protection to be reliably failure to actuate, then In=| Ibpa+Ibpb+Ibpc–Idp|, it is flexible straight
Stream protection test macro, which protects flexible direct current, applies current signal, and entire testing process is consistent with action message process, passes through
Differential protection action message is reliably failure to actuate come the automatic Verification realized differential protection action logic, act definite value.
Preferably, the differential protection automatic test module applies the electricity for meeting differential protection movement to flexible direct current protection
Flow signal, and by obtain flexible direct current protection protection exit information judge differential protection act whether action message, meanwhile,
T1 and T2 at the time of obtaining protection exit at the time of applying differential protection fault current by comparison, when calculating protection exit automatically
Between i.e. | T2-T1 |.
Preferably, the entire link of this method realizes protection act logic, protection act definite value and protection by closed-loop control
Act the automatic test of Outlet time.
Compared with prior art, built-in differential the present invention provides the differential automatic test module of flexible direct current protective device
The calculation of fault logic of protection, software can calculate differential protection action current automatically, reduce the artificial saturation logic that carries out and divide
The links such as analysis, fixed value calculation, greatly improve testing efficiency；The differential automatic test approach of flexible direct current protective device is flexible straight
Flow the automatic test of all kinds of defencive function modules such as overcurrent protection, voltage protection, in-situ protection and the overload protection of protective device
It provides a technical method to guide, has been pushed further into the automatic test of each functional module of flexible direct current protective device；It is flexible
DC differential protection test method is combined with digital analog integrated hardware platform, can be realized flexible direct current Portable test system
Exploitation makes becoming a reality in the timing maintenance verifying work at converter station scene for flexible direct current protective device.
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
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the method flow diagram of one embodiment of flexible direct current bridge arm differential protection automatic test approach of the present invention,
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
As shown in Figure 1, a kind of flexible direct current bridge arm differential protection automatic test approach proposed by the present invention, feature exist
In including the following steps:
The virtual protection definite value of S1 setting differential protection automatic test module bridge arm differential protection operation equation；
Virtual protection definite value described in S2 imports flexible direct current and protects test macro；
S3 sets fault type as short trouble；
S4 starts the operation of flexible direct current protection bridge arm differential protection movement；
S5 carries out differential protection calculating；
S6 configures the current value size of various tests needed for differential protection calculates, and the differential protection for simulating short trouble is reliable
Operation condition；
S7 differential protection automatic test module applies the current signal for meeting differential protection movement to flexible direct current protection, and
By obtain flexible direct current protection protection exit information judge differential protection act whether action message；
If S8 is above-mentioned to be judged as action message, T1 and acquisition are protected at the time of applying differential protection fault current by comparison
T2 at the time of shield outlet, automatic to calculate the protection exit time | T2-T1 |；Otherwise set protection definite value is checked, into S2；
S9 test terminates.
Preferably, the bridge arm differential protection operation equation are as follows:
|Ibpa+Ibpb+Ibpc-Idp| > Δ or | Ibna+Ibnb+Ibnc-Idn| > Δ,
Wherein Ibp、IdPFor upper bridge arm three-phase current and direct-flow positive pole electric current, Ibn、IdnFor lower bridge arm three-phase current and direct current
Cathodal current, △ are differential protection definite value, set differential protection definite value △ as Ip, and calculating is poor after importing differential automatic test module
Dynamic protection action message time difference stream should be Im, and poor stream of being reliably failure to actuate should be In.
Preferably, the upper bridge arm differential protection movement is simulated, then Im=| Ibpa+Ibpb+Ibpc–Idp|, flexible direct current protection
Test macro, which protects flexible direct current at the T1 moment, applies current signal, i.e., upper bridge arm A phase current Ibpa, upper bridge arm B phase current
Ibpb, upper bridge arm C phase current Ibpc, direct-flow positive pole electric current Idp, the upper bridge arm differential protection operation condition Im=of output CT signal satisfaction |
Ibpa+Ibpb+Ibpc–Idp|。
Preferably, the movement outlet of the differential protection movement is that direct current system is required to stop transport and/or trip and lock friendship
Flow the on-off model of breaker.
Preferably, the hard contact intake of the flexible direct current protection test macro obtains the outlet information at the T2 moment,
Then differential protection Outlet time is | T2-T1 |, after obtaining trip protection outlet information, differential protection module is out of service and automatic
It provides bridge arm differential protection movement outlet and calculates movement Outlet time.
Preferably, simulate the upper bridge arm differential protection to be reliably failure to actuate, then In=| Ibpa+Ibpb+Ibpc–Idp|, it is flexible straight
Stream protection test macro, which protects flexible direct current, applies current signal, and entire testing process is consistent with action message process, passes through
Differential protection action message is reliably failure to actuate come the automatic Verification realized differential protection action logic, act definite value.
Preferably, the differential protection automatic test module applies the electricity for meeting differential protection movement to flexible direct current protection
Flow signal, and by obtain flexible direct current protection protection exit information judge differential protection act whether action message, meanwhile,
T1 and T2 at the time of obtaining protection exit at the time of applying differential protection fault current by comparison, when calculating protection exit automatically
Between i.e. | T2-T1 |.
Preferably, the entire link of this method realizes protection act logic, protection act definite value and protection by closed-loop control
Act the automatic test of Outlet time.
Compared with prior art, built-in differential the present invention provides the differential automatic test module of flexible direct current protective device
The calculation of fault logic of protection, software can calculate differential protection action current automatically, reduce the artificial saturation logic that carries out and divide
The links such as analysis, fixed value calculation, greatly improve testing efficiency；The differential automatic test approach of flexible direct current protective device is flexible straight
Flow the automatic test of all kinds of defencive function modules such as overcurrent protection, voltage protection, in-situ protection and the overload protection of protective device
It provides a technical method to guide, has been pushed further into the automatic test of each functional module of flexible direct current protective device；It is flexible
DC differential protection test method is combined with digital analog integrated hardware platform, can be realized flexible direct current Portable test system
Exploitation makes becoming a reality in the timing maintenance verifying work at converter station scene for flexible direct current protective device.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (7)
1. a kind of flexible direct current bridge arm differential protection automatic test approach, which comprises the steps of:
The virtual protection definite value of S1 setting differential protection automatic test module bridge arm differential protection operation equation；
Virtual protection definite value described in S2 imports flexible direct current and protects test macro；
S3 sets fault type as short trouble；
S4 starts the operation of flexible direct current protection bridge arm differential protection movement；
S5 carries out differential protection calculating；
S6 configures the current value size of various tests needed for differential protection calculates, and simulates the differential protection action message of short trouble
Condition；
S7 differential protection automatic test module applies the current signal for meeting differential protection movement to flexible direct current protection, and passes through
Obtain flexible direct current protection protection exit information judge differential protection act whether action message；
If S8 is above-mentioned to be judged as action message, T1 and acquisition are protected out at the time of applying differential protection fault current by comparison
T2 at the time of mouth, automatic to calculate the protection exit time | T2-T1 |；Otherwise set protection definite value is checked, into S2；
S9 test terminates.
2. flexible direct current bridge arm differential protection automatic test approach as described in claim 1, which is characterized in that the bridge arm
Differential protection operation equation are as follows:
|Ibpa+Ibpb+Ibpc-Idp| > Δ or | Ibna+Ibnb+Ibnc-Idn| > Δ,
Wherein Ibp、IdPFor upper bridge arm three-phase current and direct-flow positive pole electric current, Ibn、IdnFor lower bridge arm three-phase current and direct current cathode
Electric current, Ibpa、Ibpb、Ibpc、Ibna、IbnbAnd IbncIt is I respectivelybpAnd IbnSplit-phase, upper bridge arm current I in substationbpBe divided into A, B,
C three-phase, i.e. Ibpa、Ibpb、Ibpc；Lower bridge arm electric current IbnIt is divided into A, B, C three-phase, i.e. Ibna、Ibnb、Ibnc, △ is differential protection definite value,
Differential protection definite value △ is set as Ip, calculating differential protection action message time difference stream should be after importing differential automatic test module
Im, poor stream of being reliably failure to actuate should be In.
3. flexible direct current bridge arm differential protection automatic test approach as claimed in claim 2, which is characterized in that on simulation is described
Bridge arm differential protection acts, then Im=| Ibpa+Ibpb+Ibpc–Idp|, flexible direct current protects test macro at the T1 moment to flexible straight
Stream protection applies current signal, i.e., upper bridge arm A phase current Ibpa, upper bridge arm B phase current Ibpb, upper bridge arm C phase current Ibpc, direct current
Positive electrode current Idp, the upper bridge arm differential protection operation condition Im=of output CT signal satisfaction | Ibpa+Ibpb+Ibpc–Idp|。
4. flexible direct current bridge arm differential protection automatic test approach as described in claim 1, which is characterized in that the differential guarantor
The movement outlet of shield movement is the on-off model for requiring direct current system stoppage in transit and/or tripping and lock AC circuit breaker.
5. flexible direct current bridge arm differential protection automatic test approach as described in claim 1, which is characterized in that described flexible straight
The hard contact intake of stream protection test macro obtains the outlet information at the T2 moment, then differential protection Outlet time is | T2-T1
|, after obtaining trip protection outlet information, differential protection module is out of service and provides bridge arm differential protection movement outlet automatically
And calculate movement Outlet time.
6. flexible direct current bridge arm differential protection automatic test approach as claimed in claim 2, which is characterized in that on simulation is described
Bridge arm differential protection is reliably failure to actuate, then In=| Ibpa+Ibpb+Ibpc–Idp|, flexible direct current protects test macro to flexible direct current
Protection apply current signal, entire testing process is consistent with action message process, by differential protection action message, reliably it is motionless
Make the automatic Verification to realize differential protection action logic, act definite value.
7. flexible direct current bridge arm differential protection automatic test approach as claimed in any one of claims 1 to 6, which is characterized in that this
The entire link of method realizes oneself of protection act logic, protection act definite value and protection act Outlet time by closed-loop control
Dynamic test.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810801A (en) * | 2015-04-28 | 2015-07-29 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Tubular bus current differential protection method applicable to direct-current ice melting system rectifying device |
| CN106019015A (en) * | 2016-06-17 | 2016-10-12 | 国网辽宁省电力有限公司锦州供电公司 | Busbar differential protection dead zone fault logic verification method |
| CN107238768A (en) * | 2017-05-15 | 2017-10-10 | 国家电网公司 | A kind of direct current protecting time on-site calibration device and method based on same clock source |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060282239A1 (en) * | 2005-06-08 | 2006-12-14 | Chang Gung University | Method of setting-up steady state model of VSC-based multi-terminal HVDC transmission system |
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- 2018-04-12 CN CN201810326682.3A patent/CN108711821B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810801A (en) * | 2015-04-28 | 2015-07-29 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Tubular bus current differential protection method applicable to direct-current ice melting system rectifying device |
| CN106019015A (en) * | 2016-06-17 | 2016-10-12 | 国网辽宁省电力有限公司锦州供电公司 | Busbar differential protection dead zone fault logic verification method |
| CN107238768A (en) * | 2017-05-15 | 2017-10-10 | 国家电网公司 | A kind of direct current protecting time on-site calibration device and method based on same clock source |
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