CN100370676C - Transformer substation automatization system information safety protecting method based on neural network under IEC 61850 standard - Google Patents
Transformer substation automatization system information safety protecting method based on neural network under IEC 61850 standard Download PDFInfo
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- CN100370676C CN100370676C CNB2005100325856A CN200510032585A CN100370676C CN 100370676 C CN100370676 C CN 100370676C CN B2005100325856 A CNB2005100325856 A CN B2005100325856A CN 200510032585 A CN200510032585 A CN 200510032585A CN 100370676 C CN100370676 C CN 100370676C
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Abstract
The present invention relates to an artificial neural network based information safety protecting method for an automation system of a transformer station, which is under the IEC 61850 standard. The present invention uses a transformer station in which a digital mutual inductor acquires data of electric current and voltage, and a communication network transmits instantaneous sampling data of electric current and voltage. When a relay protection makes a judgment that an electric network fails according to data received by the network and outputs actuating signals of a breaker to a process controller of the transformer station, the process controller collects data of electric current and voltage of all the lines and buses in the station and inputs the data into an artificial neural network for the implementation of pattern matching; thereby, whether the data of electric current and voltage of the transformer station is matched with a known fault mode can be judged, and the actuating signals of the high-voltage breaker which are sent owing to the malfunction of the relay protection which receives erroneous data are locked. The present invention can enhance the information safety protecting capability of an automation system of a transformer station under the IEC 61850 standard, and the safe and stable operation of an electric network is prevented from harm caused by that the relay protection malfunctions as a result of received erroneous data of electric current and voltage.
Description
Technical field
The present invention relates to automation of transformation substations technology, belong to protecting electrical power system control field.
Background technology
Since the mid-90, electric substation automation system is along with the development of the computer and the network communications technology has obtained substantial progress, the use network technology has appearred, as the trend of Ethernet, Lon Works (LocalOperation Network), CAN alternative control cable such as (Control Area Network).The digital mutual inductor of succeeding in developing in recent years can be with the transient current that collects, voltage signal encapsulated and sent to transformer station with the designated frame form by digital output secondary measurement and protection equipment.Electric current, voltage signal by the collection of Network Transmission digital mutual inductor can make measurement and protection part in the electric substation automation system realize that data are shared fully; thereby simplify field connection and secondary device; reduce cost, also provide technical foundation for the information sharing and the system integration that realizes transformer station's supervision, metering, control and relaying protection.Because digital signal is not subject to disturb in transmission course, this mode also helps improving rapidity, selectivity and the reliability of accuracy, reliability and the relaying protection of system.
The extensive use in electric substation automation system for the standard and the promotion network communications technology, International Electrotechnical Commission (IEC) has formulated IEC 61850 standards at the electric substation automation system communication network, and even definition and standard have been carried out in the engineering management and the Acceptance Test of the function of substation communication network and system, model, interface communication network.Directly gather current and voltage signals with traditional relay protection by cable and export circuit breaker actuating signal control circuit breaker action isolated fault different be; under IEC 61850 standards; relaying protection will judge whether electrical network breaks down according to the transient current of being collected from digital mutual inductor by communication network, voltage sample data; and when detecting fault, send the circuit breaker actuating signal to process controller by communication network, then just by process controller control circuit breaker action isolated fault.
Along with the extensive use of the network communications technology in electric power system, begin to face the problem of information security by voltage, the current sampling data of local area network (LAN) transmission in the transformer station.Invade the substation communication network and send wrong electric current, voltage data as the disabled user, just may cause protective relaying maloperation to relaying protection.Utilize user grouping mandate and data encryption to realize protecting information safety in IEC 61850 standards, these measures can improve the difficulty of network illegal invasion to a certain extent, reduce its extent of injury to electrical network, but also all have it obviously not enough simultaneously.Can increase the disabled user by the user grouping mandate and invade network and the illegal difficulty of using Internet resources, can not prevent that but inner validated user from illegally using Internet resources, can not avoid disabled user's invasion fully; The communication encryption technology can effectively reduce the safety problem that the system safety leak brings, but complicated cryptographic algorithm needs long encryption, deciphering time, is difficult to guarantee the relaying protection quick acting; Secondly, when network communication services quality (QoS) variation, encryption, deciphering behavior may be failed because of links such as authentication, password distribution make a mistake, and can't guarantee the integrality and the correctness of electric current, voltage sample data.Can avoid the assailant from outside invasion though adopt physically-isolated dedicated communications network, but owing to there are a lot of different application need and control centres to communicate in the electric substation automation system, therefore, the internal network of each transformer station can constitute a huge network by the contact of control centre.If have individual computer to have security breaches in this network, the disabled user just can invade each substation communication network that links to each other with the control centre and then the information security that jeopardizes electric substation automation system.The investigation that U.S.'s DianKeYuan carries out promptly shows; each big electrical network of the U.S. taken place tens of via the communication network illegal invasion and send out, in defeated, the distribution system by remote opening oil depot valve, control breaker operator and adjust the valve of steam generator system and the case that works the mischief; part case even cause power plant to shut down and the power distribution network power outage wherein; therefore, the protecting information safety of electric substation automation system is a realistic problem that needs to be resolved hurrily.
Summary of the invention
The technical problem to be solved in the present invention is; at the ubiquitous defective of electric substation automation system existing information safety protecting method; transformer substation automatization system information safety means of defence based on artificial neural net is proposed under a kind of IEC 61850 standards; electric current when it is short-circuited fault according to electrical network; the characteristic distributions of voltage and fault signature component thereof; utilize artificial neural net that fault data and known fault data are carried out pattern matching with the identification spurious glitches; improve the transformer substation automatization system information safety protective capacities, prevent that relaying protection is because of receiving the harm that wrong data malfunction causes power network safety operation.
The technical solution adopted in the present invention is: utilizing digital mutual inductor to gather electric current; voltage data is also used in the transformer station of transmitted data on network; when relaying protection is judged electric network fault and output action outlet signal to process controller according to the data that received by network; by the electric current of process controller by all circuits in transformer station's network gathering station and bus; voltage data; and be entered in the trained artificial neural net; carry out pattern matching with this neural net then; judge the electric current of transformer station; whether voltage data is complementary with the pattern of known true fault data; if can mate with existing fault mode; then by the action of process controller control circuit breaker; otherwise locking circuit breaker actuating signal prevents to receive wrong electric current because of relaying protection; the harm that the voltage data malfunction causes power network safety operation.
Among the present invention, electric current, voltage digital signal that described artificial neural net input layer is each circuit, bus in the transformer station, and the true and spurious glitches data training network that adopts emulation to obtain.The true fault data be utilize substation that EMTP transient emulation procedure simulation obtains at electrical network at electric current, the voltage data of each circuit and bus in the transformer station under the different running method, when dissimilar faults (single-phase earthing, phase fault, alternate ground short circuit, three-phase shortcircuit etc.) taking place in the transformer station different location.The spurious glitches data are to generate on the various normal service data basis of electrical network Various Seasonal, and the prerequisite of its generation is that hypothetical network illegal invasion person has controlled a digital transducer and supposed the single-phase or three-phase current data that its output is false.The generation method of spurious glitches data is on transformer station's circuit of the various normal operating modes that emulation obtains and bus current, voltage data basis, and single-phase or three-phase current increases 8 times with each circuit in the transformer station one by one.Process controller is with after electric current, voltage data are input to neural net in the transformer station; be judged as true fault as artificial neural net and then send the circuit breaker actuating signal by process controller; the action of control circuit breaker; otherwise locking circuit breaker actuating signal is destroyed power network safety operation to prevent relaying protection owing to receiving the misdata malfunction.
Below operation principle of the present invention made further specify.
People know that when breaking down in the electrical network, fault point and adjacent lines thereof, transformer can flow through bigger fault current, and near the voltage the simultaneous faults point will reduce.For transformer station, as the circuit of its connection fault that is short-circuited, then the electric current that flows through of faulty line has than leap ahead, and makes the voltage of institute's connection bus reduce.Whether the busbar voltage of whole transformer station should be obeyed specific pattern by its place power system operating mode, the position of fault with the line current data with the different of fault type, this characteristic can be used for detecting circuit breaker actuating signal that relaying protection sends owing to receive wrong electric current, voltage sample data and cause.When relaying protection detects fault and when process controller sends the circuit breaker actuating signal; process controller can be by judging whole transformer station electric current, voltage measuring value whether be complementary and determine whether sending actuating signal to circuit breaker with this transformer station various known fault patterns, thereby avoid destroying system safety stable operation because of relaying protection receives wrong sampled data malfunction.
As known from the above; the present invention is based on the transformer substation automatization system information safety means of defence of artificial neural net under a kind of IEC 61850 standards; it is according to the electric network fault technical characteristic; utilize artificial neural net that fault data and known fault data are carried out pattern matching with identification spurious glitches data; make electric substation automation system obtain security protection, realized thus preventing relaying protection under IEC 61850 standards because receive the harm of wrong data-signal malfunction to power network safety operation.
Description of drawings
Fig. 1 is an electric substation automation system communication scheme under IEC 61850 standards;
Fig. 2 is the structural representation of artificial neural net;
Fig. 3 is that transformer station's electric current, voltage data are gathered schematic diagram.
Embodiment
Electric substation automation system communication scheme under Fig. 1 IEC 61850 standards.Among this figure: under IEC 61850 standards, protective relaying device is obtained current/voltage transient measurement value by the field bus communication net from digital mutual inductor; When detecting short circuit malfunction, relaying protection will send the circuit breaker actuating signal to process controller by communication network, and by process controller control primary cut-out action isolated fault point;
As artificial neural network structure's schematic diagram of Fig. 2, wherein importing node input data is each circuit, transformer current and busbar voltage;
Fig. 3 is that transformer station's electric current, voltage data are gathered schematic diagram.Among this figure: CT1～CT6 is the current transformer that each circuit is installed in the transformer station; PT1～PT2 is the voltage transformer that install at each bus place in the transformer station; Feeder1～Feeder3 is 3 feeder lines of transformer station; Wherein PT and CT gather three-phase voltage and three-phase current respectively.
Be example with transformer station shown in Figure 3 below, 1,2 further specify the specific embodiment of the present invention in conjunction with the accompanying drawings.
For shown in Figure 36 groups of current transformers and 2 groups of voltage transformers transformer station of (3 mutually) arranged, at first will set up the neural net that is used for pattern matching as shown in Figure 2, this neural net input layer has 24 input nodes (3 * 8) and 1 output node.Next to train neural net with true and false fault data.Under 3 feeder lines only considering transformer station are short-circuited the situation of fault, need to 3 feeder lines single-phase short circuit, phase fault, alternate ground short circuit and three-phase fault take place respectively to the substation and carry out emulation to produce the true fault data under several operational modes of electrical network; On several normal operating mode data basis of electrical network, pass through then single-phase or 3 phase current data are amplified 8 times to form the spurious glitches data.On the basis of true and spurious glitches data, require to be output as 1 in the time of can specifying in the input data for true fault, and be output as-1 when importing data for spurious glitches, utilize back-propagation algorithm can finish the training of neural net then.Thus; the electric current that receives according to communication network when relaying protection among Fig. 1, voltage data judge electrical network be short-circuited fault and by communication network when process controller sends the circuit breaker actuating signal; process controller can be by each current-voltage transformer data in the network receiving station, and these data are input to carry out pattern matching in the neural net.As neural net output greater than 0, then show relaying protection detected be true fault, by process controller control circuit breaker action isolated fault; Else process controller locking circuit breaker actuating signal is to prevent that relaying protection is because of receiving the harm that wrong data malfunction causes to electrical network.
Claims (3)
- Under IEC 61850 standards based on the transformer substation automatization system information safety means of defence of artificial neural net; it is characterized in that; this method is; utilizing digital mutual inductor collection electric current; voltage data is also used in the transformer station of transmitted data on network; when relaying protection is judged electric network fault and output action outlet signal to process controller according to the data that received by network; by the electric current of process controller by all circuits in transformer station's network gathering station and bus; voltage data; and be entered in the trained artificial neural net; carry out pattern matching with this neural net then; judge the electric current of transformer station; whether voltage data is complementary with the pattern of known true fault data; if can mate with existing fault mode; then by the action of process controller control circuit breaker; otherwise locking circuit breaker actuating signal prevents to receive wrong electric current because of relaying protection; the harm that the voltage data malfunction causes power network safety operation.
- According under described IEC 61850 standards of claim 1 based on the transformer substation automatization system information safety means of defence of artificial neural net, it is characterized in that, adopt true fault and spurious glitches data neural network training, the true fault data be utilize substation that numerical simulation obtains under the different running method of electrical network in Various Seasonal, transformer station dissimilar short trouble takes place everywhere the time transformer station in the electric current and the voltage data of each circuit, bus; The spurious glitches data are that the single-phase or three-phase current with transformer station's circuit increases 8 times one by one on the electric current, voltage data basis of circuit and bus in the transformer station of the various normal operating modes of electrical network.
- According under described IEC 61850 standards of claim 1 based on the transformer substation automatization system information safety means of defence of artificial neural net, the input layer of employed artificial neural net is electric current, the voltage data that each electric current in the transformer station, voltage transformer are gathered.
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| CNB2005100325856A CN100370676C (en) | 2005-12-21 | 2005-12-21 | Transformer substation automatization system information safety protecting method based on neural network under IEC 61850 standard |
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| CNB2005100325856A CN100370676C (en) | 2005-12-21 | 2005-12-21 | Transformer substation automatization system information safety protecting method based on neural network under IEC 61850 standard |
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| EP1973213B1 (en) * | 2007-03-22 | 2017-12-06 | Abb Research Ltd. | Validating a standardized configuration description |
| CN101150261B (en) * | 2007-07-25 | 2012-02-29 | 南京南瑞继保电气有限公司 | Intelligent determination method for channel switch test of power measurement |
| JP2013143032A (en) * | 2012-01-11 | 2013-07-22 | Sony Corp | Power control apparatus |
| CN103746882B (en) * | 2014-01-14 | 2015-12-09 | 国家电网公司 | The method of intelligent substation station level test |
| CN104749466B (en) * | 2015-03-27 | 2017-12-29 | 广州至德电力科技有限公司 | A kind of intelligent substation relay protection test system, method of testing and implementation method |
| US10372569B2 (en) * | 2016-07-25 | 2019-08-06 | General Electric Company | Methods and system for detecting false data injection attacks |
| CN106646114A (en) * | 2016-11-16 | 2017-05-10 | 合肥普望电子有限责任公司 | Fault diagnosis method of power distribution network |
| CN107483492B (en) * | 2017-09-19 | 2020-08-25 | 广西大学 | Safety protection method for relay protection network of power system |
| CN109412153A (en) * | 2018-11-09 | 2019-03-01 | 广东电网有限责任公司 | Grid operation mode recognition methods and its system based on electric parameter state estimation |
| CN111489930A (en) * | 2020-04-09 | 2020-08-04 | 江苏三口井信息科技有限公司 | Communication safety device and method for plug-and-play low-voltage circuit breaker |
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| US20030182250A1 (en) * | 2002-03-19 | 2003-09-25 | Mohammad Shihidehpour | Technique for forecasting market pricing of electricity |
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Assignee: Nanjing Daquan Electrical Appliance Co., Ltd. Assignor: Changsha University of Sciences and Technology Contract record no.: 2010320000735 Denomination of invention: Transformer substation automatization system information safety protecting method based on neural network under IEC 61850 standard Granted publication date: 20080220 License type: Exclusive License Open date: 20060712 Record date: 20100608 |
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