CN104181442A  Power distribution network singlephase earth fault section locating method based on correlation analysis  Google Patents
Power distribution network singlephase earth fault section locating method based on correlation analysis Download PDFInfo
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 CN104181442A CN104181442A CN201410415298.2A CN201410415298A CN104181442A CN 104181442 A CN104181442 A CN 104181442A CN 201410415298 A CN201410415298 A CN 201410415298A CN 104181442 A CN104181442 A CN 104181442A
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 244000171263 Ribes grossularia Species 0.000 claims abstract 11
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 230000001360 synchronised Effects 0.000 claims description 3
 230000001264 neutralization Effects 0.000 abstract description 20
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 238000000034 methods Methods 0.000 abstract 1
 230000001052 transient Effects 0.000 description 5
 238000005259 measurement Methods 0.000 description 4
 230000000875 corresponding Effects 0.000 description 2
 238000001514 detection method Methods 0.000 description 2
 238000004088 simulation Methods 0.000 description 2
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 Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSSSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSSREFERENCE 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
 Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the loadside end user applications
 Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention provides a power distribution network singlephase earth fault section locating method based on correlation analysis. The fault line selection problem in the singlephase earth fault process of a power distribution network is not solved well, and fault locating is more difficult to refer to. After a singlephase earth fault happens to a system, the first capacitive frequency band concept is utilized, each line is simplified into a capacitance model in a zerosequence network under the selected frequency band, earth fault detection devices are arranged on line outlets and branches to measure zerosequence voltages and zerosequence currents, association coefficients of zerosequence voltage differentials and the zerosequence currents are obtained, whether fault points are in the section or not is judged according to plus and minus of the obtained association coefficients, finally the association coefficients are judged and calculated to be minus, and the section farthest away from a bus is the section where the fault points are located. The method is simple in principle and easy to implement, fault section locating can be carried out fast and reliably, and the method can be used for neutral ungrounding power distribution systems and can be used for power distribution systems with neutral points grounded through arc suppression coils.
Description
Technical field
The method that the present invention relates to a kind of electric power system fault section location, is specifically related to a kind of onephase earthing failure in electric distribution network Section Location based on correlation analysis.
Background technology
Power distribution network is directly connected with user, and its reliability has determined the power supply quality of electric system to a great extent.The power supply reliability that improves power distribution network is to improve the important research content of power system power supply reliability.Traditional distribution network line adopts radiation type electric supply mode more, and takeoff point place is without isolating switch and opertaing device, and the required time that restores electricity is long, has affected the reliability of power distribution network power supply.In recent years, along with the development of intelligent grid, " selfhealing " will become the basic function of electrical network, and fault section location is as the basis of selfhealing, is the important research content of intelligent grid.
China's power distribution network adopts neutral point small current neutral grounding mode mostly, is subject to the impact of the factors such as neutral grounding mode, power distribution network scale, transition resistance, and failure line selection problem is never satisfactorily resolved, and does not more know where to begin in section location.During small current neutral grounding system generation phaseto phase fault, can produce larger shortcircuit current, its section location is easy to realize.But while there is singlephase earth fault, shortcircuit current is little, and the curent change that flows through fault and nonfault line is only the variation of capacitive earth current.Special in system neutral is through grounding through arc, and while adopting overcompensation mode to work, utilize the variation of power frequency amount to be difficult to distinguish faulty line and nonfault line.Therefore can only adopt transient to carry out route selection for the system through grounding through arc, and during singlephase earthing, the transient state component of earthing capacitance current may be than steadystate value large several times to tens times.
Selection method sensitivity based on transient signal is higher and be not subject to the impact of arc suppression coil, but existing method is left to be desired mostly.Existing, utilize in transient method, first halfwave method is based on singlephase earth fault, to occur in fault phase voltage to approach near this assumed condition maximal value, and when phase voltage zero cross near fault, transient is faint, is difficult to meet the demands.Although, also there are some problems in the extraction faultsignal that wavelet analysis method can be more accurate, as too responsive to microvariable in the method, poor anti jamming capability; When trouble spot is during through great transition resistance eutral grounding, the method can not be carried out.Traveling wave method due to fault after wavefront be difficult to accurate seizure, and sample frequency requires high factor, is difficult to realize.Based on above all factors, can find out, the route selection problem of small current neutral grounding system is the problem of not resolving always, and section Position Research achievement is not more known where to begin.
Summary of the invention
The object of the present invention is to provide a kind of onephase earthing failure in electric distribution network Section Location based on correlation analysis.
For achieving the above object, the present invention has adopted following technical scheme:
After system generation singlephase earth fault, under selected frequency band and under the Voltage Reference direction and current reference direction of appointment, residual voltage and zerosequence current that utilization is measured at route survey point place, ask for the related coefficient of residual voltage derivative and zerosequence current, from related coefficient be negative track section or from related coefficient first for negative for chosen distance transformer station section farthest in positive track section is as fault section, thereby the section of realizing trouble spot is located.
Described related coefficient is calculated according to following formula:
Wherein, ρ [x (t), y (t)] is the related coefficient of x (t), y (t), and x (t) is residual voltage derivative, and y (t) is zerosequence current, t
_{1}and t
_{2}be respectively initial time and stop constantly.
Consider Grounding Mode of Distribution Network, circuit types, line length and certain nargin, in this method, selected frequency band is 150～600Hz.
Described Voltage Reference direction be measurement point with respect to ground, the bus of current reference direction Wei You transformer station is to circuit.
Described fault section location method specifically comprises the following steps:
Step 1: place carries out synchronized sampling to residual voltage and zerosequence current at route survey point, the residual voltage and the zerosequence current that then by analog to digital converter, sampling are obtained are converted into digital quantity;
Step 2: the digital quantity obtaining is carried out to bandpass filtering treatment, obtain zerosequence current component and zero sequence voltage component, the frequency band of bandpass filtering treatment is 150～600Hz, zero sequence voltage component is asked for to derivative and obtain residual voltage derivative, then ask for the related coefficient of residual voltage derivative and zerosequence current component;
Step 3: from related coefficient be negative track section or from related coefficient first for negative, be in positive track section chosen distance transformer station section farthest as fault section.
Beneficial effect of the present invention is embodied in:
The present invention is after system generation singlephase earth fault, utilize the first thought of holding frequency range, the ground fault detection device of being installed by each line outlet and bifurcation is measured residual voltage, zerosequence current, ask for the related coefficient of residual voltage derivative and zerosequence current, according to the related coefficient that obtains positive and negative, come failure judgement point whether in this section, finally judge calculate related coefficient for bear and from bus farthest person be place, trouble spot section, the principle of the invention is simple, be easy to realize, can be quick, carry out reliably fault section location, both can be used for isolated neutral distribution system, also the distribution system that can be used for neutral by arc extinction coil grounding, fault section location method of the present invention has important practical significance for the intellectuality of power distribution network.
Accompanying drawing explanation
Fig. 1 is 10kV power distribution network realistic model; Wherein, G represents the equivalent source of distribution network systems, and L represents arc suppression coil inductance, and K represents switch, S
_{6}～S
_{13}the load that represents respectively feeder terminal, 1～14 is sector number;
The related coefficient (isolated neutral distribution system) of section 1 residual voltage derivative and zerosequence current when Fig. 2 is section 6 fault;
The related coefficient (isolated neutral distribution system) of section 3 residual voltage derivatives and zerosequence current when Fig. 3 is section 6 fault;
The related coefficient (isolated neutral distribution system) of section 6 residual voltage derivatives and zerosequence current when Fig. 4 is section 6 fault;
The related coefficient (isolated neutral distribution system) of section 7 residual voltage derivatives and zerosequence current when Fig. 5 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 1 residual voltage derivative and zerosequence current when Fig. 6 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 3 residual voltage derivatives and zerosequence current when Fig. 7 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 6 residual voltage derivatives and zerosequence current when Fig. 8 is section 6 fault;
The related coefficient (distribution system of neutral by arc extinction coil grounding) of section 7 residual voltage derivatives and zerosequence current when Fig. 9 is section 6 fault;
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Principle of the present invention is: the thought (source: Automation of Electric Systems that holds frequency range based on head, 2003,27 (9): 4853), during distribution generation singlephase earth fault, in selected a certain frequency band range and under given voltage reference direction and current reference direction, (described Voltage Reference direction is that measurement point is with respect to ground, current reference direction is to circuit by bus), the zero sequence model that perfects circuit and rear, trouble spot circuit all can be equivalent to an electric capacity, between its zerosequence current and the derivative of residual voltage, is now that a scaleup factor is positive direct proportion function; And for faulty line, its zero sequence model consists of the circuit of system dorsal part, under a certain cutoff frequency, also can be equivalent to an electric capacity, but under designated reference direction, between its zerosequence current and residual voltage derivative for scaleup factor is negative proportion function.Therefore, ask for the residual voltage derivative at route survey point place and the related coefficient of zerosequence current.According to the related coefficient that obtains positive and negative, judge actual breaking down whether on this measurement point rear circuit, finally judge that the related coefficient Wei Fuqieli transformer station distance calculated section is farthest place, trouble spot section (being fault section), thereby realize the section location of trouble spot.
Specific embodiment of the invention step is:
Step 1: utilize the ground fault detection device of installing at measurement point (each line outlet and bifurcation), at every route survey point place, residual voltage, zerosequence current are carried out to synchronized sampling with predetermined sampling rate, the residual voltage, the zerosequence current that then by analog to digital converter, sampling are obtained are converted into digital quantity;
Step 2: the digital quantity obtaining is carried out to bandpass filtering treatment, the frequency band of bandpass filtering treatment is 150Hz～600Hz, obtain zerosequence current component and zero sequence voltage component that this frequency band is corresponding, zero sequence voltage component is now asked for to its derivative by two point value differential formulas, then utilizes formula (1) to ask for the related coefficient of residual voltage derivative and two timedomain signals of zerosequence current:
Wherein, ρ [x (t), y (t)] is the related coefficient of timedomain signal x (t), y (t), and x (t) is residual voltage derivative, and y (t) is zerosequence current, t
_{1}and t
_{2}be respectively timedomain signal initial time and stop constantly.
Step 3: the related coefficient of the track section calculating by step 2, carry out fault section location.The method of fault section location: be chosen distance transformer station section farthest negative respective segments from related coefficient, be fault section.
LG simulation test
Referring to Fig. 1, the design parameter of realistic model see " Li Guang. onephase earthing failure in electric distribution network section Position Research: [D]. Xi'an: Xi'an Communications University, 2012. ".For the sake of simplicity, it is example mutually that the singlephase earth fault arranging all be take A, at section 1～14, for example, under different transition resistance (5～500 ohm), do emulation experiment respectively, the inventive method is failure judgement section reliably all, simulation result while only providing section 6 faults (transition resistance is 150 ohm) below, K opens corresponding isolated neutral distribution system, and K closed pair is answered the distribution system of neutral by arc extinction coil grounding.
Referring to Fig. 2～Fig. 5, result is that the residual voltage derivative of section 1 and section 6 and the related coefficient of zerosequence current are negative, and the related coefficient of all the other circuits (section 2～section 5, section 7～section 14) is just, and can carry out fault section location thus.The method of fault section location: be that negative section, chosen distance transformer station section is farthest fault section from related coefficient, circuit 6 is fault section.
Referring to Fig. 6～Fig. 9, result be the residual voltage derivative of section 1 and section 6 and the related coefficient of zerosequence current first for after negative for just, the related coefficient of all the other circuits (section 2～section 5, section 7～section 14) all, always for just, can be carried out fault section location thus.The method of fault section location: be that negative section, chosen distance transformer station section is farthest fault section from related coefficient, circuit 6 is fault section.
Claims (5)
1. the onephase earthing failure in electric distribution network Section Location based on correlation analysis, is characterized in that: this fault section location method comprises the following steps:
After system generation singlephase earth fault, under selected frequency band and under the Voltage Reference direction and current reference direction of appointment, residual voltage and zerosequence current that utilization is measured at route survey point place, ask for the related coefficient of residual voltage derivative and zerosequence current, from related coefficient be negative track section or from related coefficient first for negative, be in positive track section chosen distance transformer station section farthest as fault section.
2. a kind of onephase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: described related coefficient is calculated according to following formula:
Wherein, ρ [x (t), y (t)] is the related coefficient of x (t), y (t), and x (t) is residual voltage derivative, and y (t) is zerosequence current, t
_{1}and t
_{2}be respectively initial time and stop constantly.
3. a kind of onephase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: selected frequency band is 150～600Hz.
4. a kind of onephase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: described Voltage Reference direction be measurement point with respect to ground, the bus of current reference direction Wei You transformer station is to circuit.
5. a kind of onephase earthing failure in electric distribution network Section Location based on correlation analysis according to claim 1, is characterized in that: described fault section location method specifically comprises the following steps:
Step 1: place carries out synchronized sampling to residual voltage and zerosequence current at route survey point, the residual voltage and the zerosequence current that then by analog to digital converter, sampling are obtained are converted into digital quantity;
Step 2: the digital quantity obtaining is carried out to bandpass filtering treatment, obtain zerosequence current component and zero sequence voltage component, the frequency band of bandpass filtering treatment is 150～600Hz, zero sequence voltage component is asked for to derivative and obtain residual voltage derivative, then ask for the related coefficient of residual voltage derivative and zerosequence current component;
Step 3: from related coefficient be negative track section or from related coefficient first for negative, be in positive track section chosen distance transformer station section farthest as fault section.
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CN104852364A (en) *  20150507  20150819  许继集团有限公司  Waveform correlationbased distance protection method under distributed parameter model 
CN105356428A (en) *  20151123  20160224  国家电网公司  Time domain model identification pilot protection method suitable for wind power system 
CN105842583A (en) *  20160325  20160810  西安交通大学  Distribution network singlephase grounding section positioning method based on fault phase voltage and current abrupt change 
CN106124936A (en) *  20160729  20161116  国电南瑞科技股份有限公司  A kind of Distributed power net method for locating singlephase ground fault 
CN106546873A (en) *  20160928  20170329  深圳市惠立智能电力科技有限公司  A kind of distribution singlephase earth fault Section Location and system 
CN107064729A (en) *  20161214  20170818  国家电网公司  Arc suppression coil earthing system singlephase grounding selecting method 
CN107153149A (en) *  20170511  20170912  西安交通大学  Power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic 
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CN108051693A (en) *  20171214  20180518  国网陕西省电力公司电力科学研究院  A kind of method of the raising earth fault judgment accuracy based on TAS devices 
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CN107064729B (en) *  20161214  20190917  国家电网公司  Arc suppression coil earthing system singlephase grounding selecting method 
CN107153149A (en) *  20170511  20170912  西安交通大学  Power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic 
CN107153149B (en) *  20170511  20190611  西安交通大学  Power distribution network singlephase disconnection fault recognition method based on negative sequence voltage current characteristic 
CN107632237A (en) *  20170816  20180126  杭州零尔电力科技有限公司  A kind of fault line selection method for singlephasetoground fault based on wavelet character amount correlation after failure 
CN108008247A (en) *  20171124  20180508  国网北京市电力公司  Distribution net work earthing fault localization method and device 
CN108051693A (en) *  20171214  20180518  国网陕西省电力公司电力科学研究院  A kind of method of the raising earth fault judgment accuracy based on TAS devices 
CN110187220A (en) *  20190523  20190830  昆明理工大学  A kind of MMC direct current transmission line fault recognition methods based on correlation 
CN110542823A (en) *  20190911  20191206  山东职业学院  Distribution line singlephase earth fault section positioning method 
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