CN101242093B - Integrated relay protection system based on multi-channel transient pole direction comparison algorithm - Google Patents
Integrated relay protection system based on multi-channel transient pole direction comparison algorithm Download PDFInfo
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- CN101242093B CN101242093B CN2008100091344A CN200810009134A CN101242093B CN 101242093 B CN101242093 B CN 101242093B CN 2008100091344 A CN2008100091344 A CN 2008100091344A CN 200810009134 A CN200810009134 A CN 200810009134A CN 101242093 B CN101242093 B CN 101242093B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention discloses an integrated relay protection system based on multi-channel transient state polar direction comparison algorithm. An integrated protection relay arranged in a transformer substation is connected with each line through the light-fiber net of the transformer substation and CT, for protecting each line connected to the substation. The integrated protection system is based on the detection and extraction of the high-frequency transient signal generated by line fault, and the integrated protection relay detects the transient current signal generated by fault at a transient detection unit, and a multi-channel transient filtering algorithm unit detects the transient signals of different frequency, and a transient polar identifying unit identifies the polarity of the detected signal, and then the fault direction is determined by comparing the signal polarity of each line, and actual fault line can be found out according to the polarity direction information of each substation. A tripping signal is transmitted to a line switch through the light fiber net. Comparing to the prior art, the invention has the advantages of good configuration flexibility, convenience.
Description
Technical field
The present invention relates to a kind of protection system of electric power system, is a kind of relay protection of transmission line system specifically, belongs to power system transmission line resist technology field.
Background technology
Relaying protection plays crucial effects in electric power system, but existing relaying protection is mostly based on independent electric equipment design and installation.Along with expanding economy, scale of power is increasing, and it is particularly important that electric network security seems, removes fault fast and correctly, improves the stability of a system, is the direction of relaying protection development.In modern power systems protection field, digital relay progressively replaces traditional relay.Continuous development and progress along with computer technology, the network communications technology and components and parts manufacturing process thereof; some relaying protection system focuses on some defencive functions in the protection equipment; for example computer line protection can with apart from or electric current etc. to have a protection of difference in functionality integrated as main protection, also can be with integrated protection in support such as direction protection and overcurrent protection.But degree of integration is not enough, and does not consider the influence of whole system to the relaying protection action; And the various protection philosophies based on power frequency component are still being brought into play leading role.
Summary of the invention
In order to solve the problems referred to above that prior art exists, thereby excise fault fast and accurately, the invention provides a kind of integrated relay protection system based on multi-channel transient pole direction comparison algorithm.This system comprises interface unit, the fiber optic network communication unit, and three parts such as integrated protection relay are formed.The integrated protection relay is installed in transformer station, and every link tester is crossed CT and is connected with it, and the integrated protection relay shields to every the circuit that is connected in transformer station.Fiber optic network is as the media of communication; the integrated protection relay that not only connects each transformer station also is connected integrated protection unit, interface unit and integrated protection relay, and some other equipment is (as the multichannel communication unit; gps clock, man-machine dialogue interface etc.) also be connected on the fiber optic network.Used agreement is a standard communication protocol.
The detection of the transient current signal that integrated protection system of the present invention produces with line fault and be extracted as the basis; the transient current signal that the integrated protection relay produces in the fault detection unit detection failure; multi-channel transient filtering algorithm unit detects the transient current signal of different frequency; the polarity of the transient current signal that the identification of transient state polarity identification unit is detected; determine fault direction by the transient current signal polarity that compares each bar circuit, determine the faulty line of reality by the polar orientation information processing of each transformer station.The technical scheme of described protection system is:
(1) when certain bar line failure of a transformer station, the fault detection unit in the integrated protection relay of each transformer station in the system is the transient current signal that produces of detection failure all.
(2) by the optical fiber communication polarity of each detected transient current signal in substation relatively.
(3) the integrated protection relay judges that line fault is in the guard interval of which transformer station, and makes the corresponding relays tripping operation.
The invention has the beneficial effects as follows: this integrated protection system is not only used the method that transient signal is protected for separately transmission line or power equipment provide, and a plurality of protection components in the transformer station are realized with an integrated protection system.Compare with existing relaying protection system, have flexible configuration, economic benefit easy to use and tangible has broad application prospects in electric power system.
Description of drawings
The present invention is further described below in conjunction with accompanying drawing.
Fig. 1 is based on the structural representation of the integrated relay protection system of multi-channel transient pole direction comparison algorithm;
Fig. 2 is this transmission system based on the band branch road of the integrated relay protection system of multi-channel transient pole direction comparison algorithm of checking;
Fig. 3 is based on the functional block diagram of relay of the integrated relay protection system of multi-channel transient pole direction comparison algorithm;
Fig. 4 is the protection calculation flow chart.
Embodiment
Integrated protection system as shown in Figure 1.Mainly form by three parts such as interface unit, fiber optic network communication unit and integrated protection relays.
The integrated protection relay is installed in transformer station, and every link tester is crossed CT and is connected with it, and every the circuit that is connected in transformer station is shielded.Fiber optic network is as the media of communication; the integrated protection relay that not only connects each transformer station also is connected integrated protection unit, interface unit and integrated protection relay, and some other equipment is (as the multichannel communication unit; gps clock, man-machine dialogue interface etc.) also be connected on the fiber optic network.Used agreement is a standard communication protocol.
Interface unit: this is one measures and control unit, by sensors of various types such as traditional CT and PT, the light hybrid sensor, electronics hybrid sensor etc. is connected to each equipment.The analog signal and the digital signal that measure are converted into light signal, deliver to the integrated protection relay by the fiber optic network of redundancy, and interface unit receives and carry out the signal that the relay by control circuit control sends simultaneously.
Fiber optic network: this communication network not only links to each other with relay with the interface unit of surveillance equipment, and is connected to some other equipment, such as man-machine dialogue interface, and multichannel communication unit and gps clock etc.; And be connected with the integrated protection relay of other transformer stations, use the network communication protocol of standard.
The integrated protection relay: the integrated protection relay receives from the metrical information of transformer station various places and the information of relevant transformer station by network.The integrated protection relay calculates immediately, analyzes whether fault is arranged in this transformer station or other circuits that links to each other.If the fault of having detected, the order that the integrated protection relay returns by control unit can the relevant circuit breaker of tripping.
Figure 2 shows that a band branch road transmission system, as shown in the figure, relay unit is installed in each transformer station, connects by communication port, and network protection and control unit are also supported this technology.
When fault occurs in the circuit of branch road, the point of the F2 among Fig. 2 for example, transient current signal will arrive every bus from fault point F2, and signal arrives P, Q, three buses of R respectively, and the CT that is installed on P, Q, the R is identical with the polarity that detects three transient current signals simultaneously.Think the fault in P, Q, the S guard interval.If fault occurs in F1; promptly outside the guard interval of P, Q, R; the installation detected transient current signal of CT on the line is with difference; the polarity information of the transient current signal that the detected fault of each relay produces is delivered on the relevant other end relay S of protection branch road by communication network, determines more finally that by fault polarity fault is outside the guard interval of P, Q, R.
Then, the polarity information that each relay detects is delivered to network protection and control unit, can judge fault wire by these information.This unit is not only as the backup protection unit of every line, and can guarantee the stability of network protection and control unit and main system.
Relay design
Figure 3 shows that the block diagram of relaying protection system, it mainly comprises communication Ethernet and relay.
Communication network is fetched current measurement data from the interface unit of connection line CT, these measured values or be digital signal from optical sensor, or from the digital signal of traditional CT through the interface unit conversion.Communication network is also accepted from the trip command of relay and is delivered to corresponding switch.Another is connected online important device is the multiplex communication unit, and its function is that the detected polar signal of relay is delivered to the protection circuit remote relay, accepts the polar signal that the protection circuit remote relay is sent here simultaneously.It is that the system backup protection is used with control unit that the polar signal of local terminal also will be sent to the central network protection.
Relay comprises fault detection unit, transient signal extraction unit, polarity detecting unit, polarity comparing unit and a tripping operation decision package.
1) fault detection unit obtains current measurement information from CT, and this magnitude of current is in case surpass the threshold value that sets in advance.Relay starts defence program immediately.The current value that fault detection unit selects a CT on the circuit to measure simultaneously calculates.The detection of the current polarity that needs for present technique knows that a current polarity on the circuit both can derive the polarity on other line related.
2) extraction of fault transient signal, as shown in Figure 3, it is according to two principles that two-way different frequency transient current signal extracts:
The extraction of a, high-frequency signal band (shown in A among Fig. 3), it comprises modulus conversion and two steps of high-frequency band pass filtering.By this method, can provide the response speed that is exceedingly fast to protect with adaptive system.
The extraction (shown in B among Fig. 3) of b, fault stack component composition, it comprises that fault choosing phase and fault component extract two steps.By implant a stack component composition extraction algorithm in program, promptly sampled value has postponed one-period in memory, deducts the sample of delay from nearest sample, just forms fault current stack component.
Here should be noted that the conventional voltage converter, particularly the capacitor voltage converter has bandwidth constraints, can not be applied to extract high-frequency signal, and use power pack, does not just have the bandwidth constraints problem.
3) polarity detects and compares
In case fault-signal is detected by the transient state filter unit; digit counter with adaptive algorithm just is used for this signal; if fault superposed signal level is greater than self adaptation threshold value level; after exceeding the determined binding hours of counter; just can determine the polarity of the transient signal of fault generation; polarity information is delivered to the next stage then; compare with the detected polarity of the other end of protected location; have only when relay has received the signal identical with its transmission signal polarity, illustrate that just fault is on protection circuit.Meanwhile, polar signal also will be sent to network protection and control unit, be used for network protection and control.Network protection and control unit come all polar signals of comparison system just can learn the circuit of fault by same principle.
4) tripping operation decision logic
When relay has received the signal identical with its transmission signal polarity, mean that fault occurs on the protection circuit.The tripping operation decision logic unit is received the output signal of two channels (high frequency and fault component), and there are two selective working methods that set in advance this unit:
Mode 1 (" or " mode): the output signal of two channels has a failure judgement on protective wire, promptly makes final tripping operation decision-making.
Mode 2 (" with " mode): the output signal of two channels has two failure judgement on protective wire, just makes final tripping operation decision-making.
5) multichannel communication unit
The multichannel communication unit is used for route protection and network protection in relay.
In case the polarity checkout gear has been determined signal polarity, polar signal will be sent to the network protection automation equipment by communication unit.Network protection automation equipment all relay received signals from network, relatively the signal of Huo Deing just can be determined the physical fault part of path.This unit also is used to receive the instruction (for example, trip signal) from the network protection automation equipment.
Communication unit is used for communicating with other single line protective devices relay.At the polar signal that local side is measured, send to the other end relay of protected line.
The communication here only requires " opening " or " pass " signal of communication, respectively representing positive polarity or negative polarity ".For example, if identical in the signal polarity at protected line two ends, internal fault has appearred in expression.
The course of work of present embodiment
For example break down when the F1 point in power transmission network shown in Figure 2, the relay P of 1# circuit three ends so, relay Q and relay R will be moved, and move in circuit breaker trip, excise this circuit.Relay S will be failure to actuate.
The concrete course of work is as follows:
1. establish the F2 point fault has taken place.
2. (CS, CP1, CP2, CQ1, CQ2, electric current CR) will change to flow through all current transformers.
3. these current signals will be detected and deliver to separately transformer station's Ethernet by interface unit (IU).
4. all relays (relay S, relay P, relay Q and relay R) that are connected transformer station Ethernet back separately will obtain current signal separately.
5. the protection flow chart that the relay that detects fault and started calculates oneself as shown in Figure 4.
6. relay P is an example, and after fault detect goes out, the protection algorithm will adopt the electric current of current transformer CP1 or CP2 to do next step and calculate usefulness.Just can derive another or the polarity that is connected in the circuit on the bus because detect the current polarity of a current transformer more at once.The same CP2 of CP1 for example, CQ1 is opposite with the polarity of CQ2.
7. program enters two parallel computational algorithms then respectively: the extraction of the extraction of (1) high frequency content and (2) fault component;
1), the extraction of high frequency content will be through the stage of modulus conversion and high-frequency band pass filtering amount;
2), the extraction of fault component will be through fault choosing phase and two stages of component extraction.
8. program will enter the polarity verification unit afterwards; algorithm will divide other to derive the polarity of high frequency and two signals of fault component; and they are passed out to institute's protection circuit (circuit 1 by network; circuit 2; circuit 3) far-end relay (relay S, relay Q and relay R) and network protection and control unit.Here the polarity of CP1 is sent to relay S, and the polarity of CP2 is sent to relay Q and relay R.
9. program will enter the polarity comparing unit afterwards.This moment relay will receive from institute's protection circuit far-end relay (relay S, relay Q and relay R) send here high frequency and the polar signal of fault component.Here, the polarity of CT1 will with the polarity of the CS of relay S relatively.The polarity of CT2 will with the polarity of the CR of the polarity of the CQ1 of relay Q and relay R relatively.If the identical internal fault that is protection circuit of polarity, otherwise be external fault.In this example because fault at the F2 point, so the polarity of the detected CP2 of relay P will be identical with the polarity of the detected CR of relay R with the polarity of the detected CQ1 of relay Q.And the polarity of the detected CT1 of relay P will be opposite with the polarity of the CS of relay S, thereby can draw on On-line Fault road 2 and 3 and not on circuit 1.
10. because high-frequency signal and fault component are to compare respectively, the result will produce two results.Two results that compare respectively are defeated by the tripping operation decision logic unit then, and there are two kinds of mode of operations that can set in advance this unit: pattern 1 and 2;
1) pattern 1 needs the result of two comparisons that the decision-making that can make tripping operation for internal fault is arranged;
2) result of two comparisons of pattern 2 needs is the decision-making that internal fault just can be made tripping operation; Pattern 1 reaction speed is fast, and pattern 2 reliability height.
11. after the tripping operation, program will be returned.
Claims (3)
1. integrated relay protection system based on multi-channel transient pole direction comparison algorithm, by interface unit, fiber optic network communication unit and integrated protection relay three parts are formed, the integrated protection relay is installed in transformer station, every link tester is crossed CT and is connected with it, the fiber optic network communication unit not only connects the integrated protection relay of each transformer station, also with the integrated protection unit, interface unit is connected with the integrated protection relay, the multichannel communication unit, gps clock and man-machine dialogue interface also are connected on the fiber optic network, it is characterized in that: described integrated protection relay extracts HFS and fault component part in the transient current signal that line fault produces respectively by the algorithm of two parallel runnings;
(1) when certain bar line failure of a transformer station, the fault detection unit in the integrated protection relay of each transformer station in the described system is the transient current signal that produces of detection failure all;
(2) obtain the polarity of HFS in the detected transient current signal in each substation and fault component part by fiber optic network communication;
(3) the integrated protection relay by respectively relatively the HFS that transmits with far-end that extracts of this relay and the polarity of fault component part judge that line fault is in the guard interval of which transformer station, the control of the setting by Trip Logic makes the corresponding relays tripping operation.
2. the integrated relay protection system based on multi-channel transient pole direction comparison algorithm according to claim 1; it is characterized in that: the detection of the transient current signal that the integrated protection relay of integrated protection system produces with line fault and be extracted as the basis; the transient current signal that the integrated protection relay produces in the fault detection unit detection failure; HFS and fault component part in the transient current signal of multi-channel transient filtering algorithm unit detection different frequency; the polarity of HFS that the identification of transient state polarity identification unit is detected and fault component part; by each bar circuit relatively HFS and the polarity of fault component part determine fault direction, the polar orientation information processing by each transformer station determines actual faulty line.
3. the integrated relay protection system based on multi-channel transient pole direction comparison algorithm according to claim 2, it is characterized in that: the decision-making Trip Logic of the high frequency of described protection system and fault component two passage transient pole direction comparison algorithms has two kinds of setting modes: (1) or logic: any one the tunnel is that hf channel or fault component passage are output as trip signal, and relay will be made the tripping operation decision-making; (2) and logic: two-way is hf channel and the output of fault component passage during simultaneously for trip signal, and relay is just made the tripping operation decision-making.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100091344A CN101242093B (en) | 2007-11-16 | 2008-01-22 | Integrated relay protection system based on multi-channel transient pole direction comparison algorithm |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200710185257 | 2007-11-16 | ||
| CN200710185257.9 | 2007-11-16 | ||
| CN2008100091344A CN101242093B (en) | 2007-11-16 | 2008-01-22 | Integrated relay protection system based on multi-channel transient pole direction comparison algorithm |
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| Publication Number | Publication Date |
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| CN101242093A CN101242093A (en) | 2008-08-13 |
| CN101242093B true CN101242093B (en) | 2011-06-01 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101895102B (en) * | 2010-08-04 | 2013-01-02 | 宁夏回族自治区电力公司 | Centralized and integrated application method of relay protection setting calculation |
| CN102522821B (en) * | 2011-12-01 | 2015-01-07 | 许继电气股份有限公司 | Intelligent terminal equipment in intelligent transformer substation and control method thereof |
| CN102636726B (en) * | 2012-04-16 | 2014-06-04 | 许继电气股份有限公司 | Method for carrying out adaptive discriminating on polarity of CT (current transformer) of new line in distribution network |
| CN106099869B (en) * | 2016-07-01 | 2018-04-20 | 东北电力大学 | A kind of intelligent substation integrated protection computational methods with fault freedom |
| CN106324403B (en) * | 2016-08-29 | 2019-03-19 | 国网江苏省电力公司电力科学研究院 | A kind of relay protection adaptive filtering algorithm based on state recognition |
| CN107482776A (en) * | 2017-08-29 | 2017-12-15 | 安徽三和电力技术有限公司 | Secondary microcomputer-based intelligent monitor control system |
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