CN104077486A - Method for diagnosing power system faults - Google Patents
Method for diagnosing power system faults Download PDFInfo
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- CN104077486A CN104077486A CN201410308480.8A CN201410308480A CN104077486A CN 104077486 A CN104077486 A CN 104077486A CN 201410308480 A CN201410308480 A CN 201410308480A CN 104077486 A CN104077486 A CN 104077486A
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Abstract
The invention discloses a method for diagnosing power system faults. The method includes the following steps: (1) classifying the system faults into the following classes according to the device type; (2) providing a fault diagnosing deduction model and a network structure analyzing deduction model; (3) selecting fault characteristics; (4) deducting the fault diagnosing process. The network structure analyzing deduction model is utilized to judge whether a system is disconnected, then a vague qualitative reasoning model is utilized to judge whether a power grid is unstable, and a fault judgment method based on multi-factor fuzzy qualitative reasoning is provided. The basic idea is that characteristic phenomena of each fault are of multiple aspects, the characteristic phenomena of different faults are definitely different, and a user can judge whether the system faults belong to system oscillation faults, system frequency collapse faults, system voltage collapse faults or common fault types according to system characteristics including fault alarm data, system frequency, bus voltage, power plant power change, linkage line power factors and the like.
Description
Technical field
The present invention relates to field of power, specifically refer to a kind of for diagnosing the method for electric power system fault.
Background technology
Modern power systems is in service, and electric system large area blackout is the problem that need to attract great attention.In the last few years, electric system both at home and abroad, because repeatedly large area blackout once occurred stability disruption, caused very big infringement to national economy, and society and people's lives are greatly affected.The operation of guarantee power system safety and stability, prevents that large area blackout from being the urgent and great task that modern power systems faces.On the other hand, once electric system has an accident, how Bian gets correct effective measures and dwindles as much as possible power failure range, shortens power off time, restores electricity early, becomes the problem of and prevention power system accident no less important.
Power system accident processing is an extremely complicated Real-time Decision process, has many probabilistic factors.Expert system is for the approach likely that provides is provided, this computer software that carries out problem solving taking domain-specialist knowledge and experience as basis, has very large potentiality solving aspect complicated, uncertain information processing and decision problem.Fushun electrical network network reconfiguration demand analysis.
After on-the-spot telemechanical apparatus action, both transmit information to concentrator station, also transmitted information to CC-2000 system simultaneously.Current C C-2000 system is received after failure message, does not do the further processing of network reconfiguration aspect, does not also possess to the function of relevant control device sending controling instruction.
Need to judge fast and accurately for the fault occurring in system, this just need to make a classification to the various faults that occur in system, this feature that just need to select certain general character according to the feature of fault is divided into a class, thereby makes more easily to realize in the time doing fault diagnosis algorithm.
Summary of the invention
The object of the invention is to overcome blindness drillhole blasting in stress relief process in the past and the deficiency of stress relief weak effect, provide a kind of possess counter stress concentrate position prediction accurately, stress relieving puts, removes effect detection reliable results, with strong points and simple and practical, workable and effective strong rock burst tunnel micro seismic monitoring and the stress relieving construction method of rock burst control in place.
The present invention is achieved through the following technical solutions: a kind of for diagnosing the method for electric power system fault, comprise the following steps:
(1) systematic failure is classified, according to device type, fault is divided into following classification;
(2) inference pattern of fault diagnosis, Crosslinking Structural inference pattern;
(3) select fault signature;
(4) reasoning fault diagnosis flow scheme.
Further, described in described step (1), fault category comprises, main transformer fault, bus-bar fault, fault of interconnected transmission line, and power plant failure.
Further, in described step (3), can select fault signature to comprise variation and the interconnection power factor of fault alarm data, system frequency, busbar voltage, generating plant power.
Further, described main transformer fault is, main transformer has standby fault-B1 type, more than two or two days main transformer side by side, when dividing or having standby operation, there is tripping operation fault in an operation main transformer wherein; First consider that station internal loading switches, utilize backup auto-activating device, original fault main transformer load switching is arrived to other main transformers; If switch unsuccessfully, utilize other one time power transformation source bands all or part of load of main transformer that is out of order by interconnection; Main transformer is without standby fault-B2 type, because of high voltage bus dead electricity or other reasons, causes the transforming plant main transformer fault that all trips; Utilize other once just Power supply belt all or part of loads of main transformer that is out of order by interconnection.
Further, described 2 bus-bar faults are, bus has standby fault-Ml type, when the other female operation of two mothers or two master tape, and a wherein bus-bar fault; First consider to utilize backup auto-activating device, original fault bus load switching is arrived to other buses; If switch unsuccessful, just by interconnection utilize other once the Power supply belt bus that is out of order load in whole or in part; Bus is without standby fault-M2 type, and all buses of transformer station break down simultaneously; Utilize other one time power transformation sources to take all or part of load of fault bus out of by interconnection; While thering is the female operation of transformer station's list of many buses, if operation bus breaks down, belong to nothing for fault.
Further, described fault of interconnected transmission line is, interconnection has standby fault-L1 type, and two or two above interconnections are side by side or while having received shipment capable, wherein tripping operation fault occurs an interconnection; First consider that line-to-line load but changes, can utilize backup auto-activating device, by original faulty line load switching to extension wire; If switch unsuccessfully, utilize other one time power transformation sources to take all or part of load of losing because of fault of interconnected transmission line out of by distant place interconnection; Interconnection is without standby fault-L2 type, the fault that simultaneously trips of all interconnections between two transformer stations; Utilize other one time power transformation sources to take all or part of load of losing because of fault of interconnected transmission line out of by distant place interconnection.
Further, power plant failure is, power plant failure-PP type, and generating plant generation catastrophic failure, with grid disconnection; Utilize backup auto-activating device, or utilize other one time power transformation sources to take all or part of load of losing because of power plant failure out of by interconnection, be thought of as power plant's power transmission simultaneously.
The present invention compared with prior art, the advantage having and beneficial effect are: first propose to judge whether off-the-line of system with network interpretation of result inference pattern, then propose to judge whether unstability of electrical network with fuzzy qualitative inference model, in the time can not using two kinds of ways to judge the system failure in system, just need a kind of new way to judge electric network fault, propose a kind of fault judgment method based on multifactor fuzzy qualitative reasoning, its basic ideas are: the characteristic phenomenon of every kind of fault is many aspects; The characteristic phenomenon of different faults certainly can be completely unidentical.
Judge that with the system features such as variation, interconnection power factor of fault alarm data, system frequency, busbar voltage, generating plant power the system failure belongs to system oscillation fault, system frequency collapse fault, system voltage collapse fault, generic failure type.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this, without departing from the idea case in the present invention described above, according to ordinary skill knowledge and customary means, make various replacements and change, all should comprise within the scope of the invention.
Embodiment:
The present embodiment discloses a kind of for diagnosing the method for electric power system fault, and fault can be divided into main transformer fault, bus-bar fault, fault of interconnected transmission line, power plant failure according to device type.According to spare condition can be divided into have standby and without standby.The power supply strategy that has standby fault is first to utilize throwing device for subsequent use to carry out localised load switching; If switch unsuccessfully, utilize other power supplys to take all or part of fault load out of by interconnection.To utilize other power supplys to take all or part of load because of fault loss out of by interconnection without standby fault power supply strategy.
The classification of 1 systematic failure
Generic failure, oscillation fault, collapse of frequency, collapse of voltage, system break-down.Generic failure is exactly the unlikely local fault that causes large-area power-cuts, common corresponding individual equipment fault.To this type of fault, adopt conventional numerical method, as security-constrained dispatch, optimal load flow etc., can determine safety correction countermeasure.In the corresponding schedule regulation of other faults, require Bian to get emergency measures, as pulling load, emergency stop, system sectionalizing etc., avoid the systemic catastrophic failure of long-time large-area power-cuts as far as possible.
Main transformer has standby fault (B1 type): two or more main transformers side by side, apportion or while having standby operation, wherein tripping operation fault occurs an operation main transformer.First consider that station internal loading switches (when paired running, naturally switching), can utilize backup auto-activating device, original fault main transformer load switching is arrived to other main transformers.If switch unsuccessful (may because backup auto-activating device not enable or haul oneself willingly into failure, transformer overload etc.), utilize other one time power transformation source bands all or part of load of main transformer that is out of order by interconnection.
Main transformer is without standby fault (B2 type): because of high pressure (220kV) bus dead electricity or other reasons, cause the transforming plant main transformer fault that all trips.Utilize other one time power transformation source bands all or part of load of main transformer that is out of order by interconnection.
Bus has standby fault (Ml type): when two mothers (containing single mother partition) or the other female operation of two master tape, and a wherein bus-bar fault.First consider to utilize backup auto-activating device, original fault bus load switching is arrived to other buses.If switch unsuccessfully, utilize other one time power transformation sources to take all or part of load of fault bus out of by interconnection.
Bus is without standby fault (M2 type): all buses of transformer station break down simultaneously.Utilize other one time power transformation sources to take all or part of load of fault bus out of by interconnection.While thering is transformer station single female operation of many buses (other buses may in inspecting state), if operation bus breaks down, obviously belong to without standby fault.
Interconnection has standby fault (L1 type): two or more interconnection side by side or while having standby operation, wherein tripping operation fault occurs an interconnection.First consider that line-to-line load switches (when paired running naturally switching), can utilize backup auto-activating device, by original faulty line load switching to extension wire.If switch unsuccessfully, utilize other one time power transformation sources to take all or part of load of losing because of fault of interconnected transmission line out of by distant place interconnection.
Interconnection is without standby fault (L2 type fault): the fault that simultaneously trips of all interconnections between two transformer stations.Utilize other one time power transformation sources to take all or part of load of losing because of fault of interconnected transmission line out of by distant place interconnection.
Power plant failure (PP type fault): generating plant generation catastrophic failure, with grid disconnection.Utilize backup auto-activating device, or utilize other one time power transformation sources to take all or part of load of losing because of power plant failure out of by interconnection, be thought of as power plant's power transmission simultaneously.
The inference pattern of 2 fault diagnosises
Crosslinking Structural inference pattern.Based on the Crosslinking Structural system sectionalizing evaluation algorithm of parallel breadth-first search, basic ideas: each is cut-off to circuit, from the plant stand of both sides, the circuit search opposite end plant stand that is successively alternately "on" position to both sides, outer switch.If two-sided search is to same plant stand, system does not have off-the-line; Otherwise, if any side can not expand new connection plant stand, system generation off-the-line again.
Fuzzy qualitative inference model.Application expert system judges that electrical network unstability fault mainly contains three aspects: difficulty: whether (1) can not directly utilize numerical result and device fault information inference system to lose stable; (2) real time data and warning information are described grid failure state and are had uncertainty; (3) yardman's fault judgemental knowledge and experience are fuzzy, uncertain often, generally can not apply simple two-valued function rule and be described.
Above situation shows how to consider rightly the uncertain factor in observation evidence and knowledge experience, is the key issue of setting up electric network failure diagnosis system.For this reason, propose a kind of fault judgment method based on multifactor fuzzy qualitative reasoning, its basic ideas are: the characteristic phenomenon of every kind of fault is many aspects; The characteristic phenomenon of different faults certainly can be completely unidentical.
The selection of 3 fault signatures
Available feature has: variation, the interconnection power factor etc. of fault alarm data, system frequency, busbar voltage, generating plant power.The feature of oscillation fault is mainly manifested in four aspects: (1) system frequency is obviously different; (2) each point voltage cycle swings; (3) generating plant and interconnection power significantly swing; (4) interconnection power factor cyclic fluctuation.When collapse of frequency fault, all there is extremely low frequency in each frequency monitoring point, therefore easily diagnosis.When collapse of voltage, region substation bus bar voltage is lower than lowest limit working voltage, will consider to get rid of to occur the too low erroneous judgement causing of short time voltage because of system oscillation when diagnosis.If main grid structure structural integrity, and system frequency, voltage all, in the accident limit, are diagnosed as generic failure.
4 fault diagnosis reasoning flow processs
Fault diagnosis reasoning flow process, in the time that system breaks down warning, program is done two kinds of processing to fault alarm, the first is in the time having branch road to disconnect, adopt the principle of parallel breadth-first search to judge the state of system, if system sectionalizing just forms off-the-line plant stand table, then Bian controls system with recovering control measure, if system is got back to intelligent alarm processing without off-the-line; It two is in the time having off-limit alarm, updating system state, judge that whether system is to the cycle, if the cycle that is less than returns to intelligent alarm processing, if just system is done to fuzzy qualitative reasoning to the cycle, judge whether generation systems fault of system, as do not have generation systems fault just to return to intelligent alarm processing, just take emergency control measure as generation systems fault system is recovered to control.
The above, be only preferred embodiment of the present invention, not the present invention done to any pro forma restriction, and any simple modification, equivalent variations that every foundation technical spirit of the present invention is done above embodiment, within all falling into protection scope of the present invention.
Claims (7)
1. for diagnosing a method for electric power system fault, it is characterized in that: comprise the following steps:
(1) systematic failure is classified, according to device type, fault is divided into following classification;
(2) inference pattern of fault diagnosis, Crosslinking Structural inference pattern;
(3) select fault signature;
(4) reasoning fault diagnosis flow scheme.
2. according to claim 1 a kind of for diagnosing the method for electric power system fault, it is characterized in that: described in described step (1), fault category comprises main transformer fault, bus-bar fault, fault of interconnected transmission line and power plant failure.
3. according to claim 1 a kind of for diagnosing the method for electric power system fault, it is characterized in that: described in described step (3), select fault signature to comprise variation and the interconnection power factor of fault alarm data, system frequency, busbar voltage, generating plant power.
4. according to claim 2 a kind of for diagnosing the method for electric power system fault, it is characterized in that: described main transformer fault is that main transformer has standby fault
-b1 type, more than two or two days main transformer side by side, when dividing or having standby operation, there is tripping operation fault in an operation main transformer wherein; First consider that station internal loading switches, utilize backup auto-activating device, original fault main transformer load switching is arrived to other main transformers; If switch unsuccessfully, utilize other one time power transformation source bands all or part of load of main transformer that is out of order by interconnection; Main transformer is without standby fault-B2 type, because of high voltage bus dead electricity or other reasons, causes the transforming plant main transformer fault that all trips; Utilize other once just Power supply belt all or part of loads of main transformer that is out of order by interconnection.
5. according to claim 2 a kind of for diagnosing the method for electric power system fault, it is characterized in that: described bus-bar fault is that bus has standby fault-Ml type, when the other female operation of two mothers or two master tape, a wherein bus-bar fault; First consider to utilize backup auto-activating device, original fault bus load switching is arrived to other buses; If switch unsuccessful, just by interconnection utilize other once the Power supply belt bus that is out of order load in whole or in part; Bus is without standby fault-M2 type, and all buses of transformer station break down simultaneously; Utilize other one time power transformation sources to take all or part of load of fault bus out of by interconnection; While thering is the female operation of transformer station's list of many buses, if operation bus breaks down, belong to nothing for fault.
6. according to claim 2 a kind of for diagnosing the method for electric power system fault, it is characterized in that: described fault of interconnected transmission line is that interconnection has standby fault-L1 type, article two, or two above interconnections side by side or while having received shipment capable, wherein tripping operation fault occurs an interconnection; First consider that line-to-line load but changes, can utilize backup auto-activating device, by original faulty line load switching to extension wire; If switch unsuccessfully, utilize other one time power transformation sources to take all or part of load of losing because of fault of interconnected transmission line out of by distant place interconnection; Interconnection is without standby fault-L2 type, the fault that simultaneously trips of all interconnections between two transformer stations; Utilize other one time power transformation sources to take all or part of load of losing because of fault of interconnected transmission line out of by distant place interconnection.
7. according to claim 2 a kind of for diagnosing the method for electric power system fault, it is characterized in that: power plant failure is power plant failure-PP type, and generating plant generation catastrophic failure, with grid disconnection; Utilize backup auto-activating device, or utilize other one time power transformation sources to take all or part of load of losing because of power plant failure out of by interconnection, be thought of as power plant's power transmission simultaneously.
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| CN104504269A (en) * | 2014-12-24 | 2015-04-08 | 国网山东省电力公司临沂供电公司 | Boundary condition classification based multiple fault calculation method |
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| US20120053780A1 (en) * | 2010-08-31 | 2012-03-01 | Seoul National University R&Db Foundation | Fault Detector and Fault Detection Method for Attitude Control System of Spacecraft |
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| US6766230B1 (en) * | 2000-11-09 | 2004-07-20 | The Ohio State University | Model-based fault detection and isolation system and method |
| US20120053780A1 (en) * | 2010-08-31 | 2012-03-01 | Seoul National University R&Db Foundation | Fault Detector and Fault Detection Method for Attitude Control System of Spacecraft |
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| CN104504269A (en) * | 2014-12-24 | 2015-04-08 | 国网山东省电力公司临沂供电公司 | Boundary condition classification based multiple fault calculation method |
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Application publication date: 20141001 |