CN105548801A - Fault location method suitable for closed-loop operation of distribution network - Google Patents
Fault location method suitable for closed-loop operation of distribution network Download PDFInfo
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- CN105548801A CN105548801A CN201510869787.XA CN201510869787A CN105548801A CN 105548801 A CN105548801 A CN 105548801A CN 201510869787 A CN201510869787 A CN 201510869787A CN 105548801 A CN105548801 A CN 105548801A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- General Physics & Mathematics (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Locating Faults (AREA)
Abstract
The present invention discloses a fault location method suitable for a closed-loop operation of a distribution network, belonging to the field of the electrical power system distribution network automation technology. The method is used for distribution network fault location of a closed-loop operation or an opened-loop and closed-loop mixture operation; each switch in the distribution network is provided with one terminal; adjacent switch terminals communicate on a peer-to-peer basis to interact collected fault states, current flow information and switch-on-off state information of switches in real time; and the switches which are detected to have faults or have no fault are configured to locate the fault sections of the switches according to whether the fault states and the plus or minus power of adjacent switches in the section are in accordance with the switch or not. According to the invention, the rapid and effective location and isolation of short circuit faults in a closed-loop operation distribution line may be realized, and therefore the timeliness, the safety and the reliability of power supply are improved.
Description
Technical field
The invention discloses the Fault Locating Method being applicable to power distribution network operation with closed ring, belong to the technical field of system for distribution network of power robotization.
Background technology
Feeder automation (FA, FeederAutomation), refer to the operation conditions utilizing automation equipment or system monitoring distribution line, Timeliness coverage line fault, rapid diagnosis is out of order interval fault section being isolated, and recovers power supply to non-faulting interval.
Distribution network line protection has larger difference with the protection of power grids circuits, especially mesolow distribution line is compared with transmission line of electricity, the spacing of usual two switches shorter (usually can not more than 1km), the fault current difference of so different section is very little negligible, realizes route protection obviously impossible according to fault current differential; From temporal cooperation; because the number of switches of a distribution feeder line is more; but substation exit switch is adjusted usually, fault Outlet time is 0; even if will lengthen the time; in order to protect station in equipment; also can not adjust more than 500ms, also be difficult to so in time realize multistage cooperation.Therefore, the route protection of distribution is difficult to adopt the mode of cascaded coordination in route protection to complete the isolation of fault section.The centralized FEEDER AUTOMATION of main employing or the FEEDER AUTOMATION that sequentially overlaps on the spot in Current Distribution Automation.Centralized FEEDER AUTOMATION is that the fault relevant information in a region is uploaded to main website or substation, carries out fault diagnosis, and then complete fault handling by main website or substation; Order coincidence FEEDER AUTOMATION utilizes voltage or electric current to coordinate with the time on the spot, and the mode overlapped by multiple switch completes fault handling.Centralized FEEDER AUTOMATION is limited by the scale in region, and real-time increases along with equipment in region and has a greatly reduced quality, and affects power supply reliability; Order coincidence system is with the power failure in time and non-faulting region on the spot, even completes the isolation of fault with the impact system that repeatedly overlaps for cost, affects the real-time of power supply, safety and reliability equally.
Intelligent distribution type feeder automation technology based on adjacent switch terminal between peer-to-peer communications realize fault handling, but seek a kind of simple but adaptable Fault Locating Method, be still the current problem that will solve.
Summary of the invention
Technical matters to be solved by this invention is the deficiency for above-mentioned background technology, provide the Fault Locating Method being applicable to power distribution network operation with closed ring, in power distribution network many power supplys (comprising distributed power source grid-connected) rack under Electromagnetic coupling, and cyclization and open loop under the method for operation of depositing, location rapidly and efficiently and isolation are realized to the short trouble that occurs in circuit, solves the technical matters of existing distribution network failure location technology impact power supply real-time, security, reliability.
The present invention adopts following technical scheme for achieving the above object:
Be applicable to the Fault Locating Method of power distribution network operation with closed ring, the short circuit fault of power distribution network that described method is used for Electromagnetic coupling or open loop and cyclization mixed running is located, in power distribution network, each switchgear distribution has terminal, the malfunction that adjacent switch terminal peer-to-peer communications real-time, interactive gathers, current direction information and switch opening and closing state information, according to the switch positive dirction of each switch in face-to-face or back-to-back principle determination power distribution network
Switch to fault being detected: if do not have switch fault to be detected in all adjacent switches of its any section offside, or, detect that the power of the switch of fault is positive and negative all consistent with this switch in all adjacent switches of this section offside, then judge that short dot is at this section of this switch
To fault not detected and being in the switch of "on" position: if only have a switch fault to be detected in all adjacent switches of its any section offside, or, detect in all adjacent switches of this section offside that the power of the switch of fault is positive and negative all consistent, then judge that short dot is at this section of this switch.
Further, described in be applicable in the Fault Locating Method of power distribution network operation with closed ring, according to the concrete steps of the switch positive dirction of each switch in face-to-face or back-to-back principle determination power distribution network be:
A, determine initialize switch positive dirction: specify with any switch and point to the direction of another section for positive dirction for initialize switch from its arbitrary section;
B, determine the positive dirction of all switches adjacent with initialize switch:
For the adjacent switch that initialize switch positive dirction is pointed to, to point to the direction of initial switch for positive dirction,
For deviate from initialize switch positive dirction point to adjacent switch, with initial switch pros in the opposite direction for positive dirction;
C, determine the positive dirction of other switch step by step according to the defining method of all switch positive dirctions adjacent with initialize switch.
As the described further prioritization scheme being applicable to the Fault Locating Method of power distribution network operation with closed ring, the method that switch terminal gathers fault status information is: when actual current or zero-sequence current are greater than setting valve, be judged to fault to be detected; Otherwise, be judged to fault not detected.
As the further prioritization scheme stating the Fault Locating Method being applicable to power distribution network operation with closed ring, the method that switch terminal gathers current direction information is: be timing at switch power, judges that the current direction of this switch is identical with its switch positive dirction; At switch power for time negative, judge that the current direction of this switch is contrary with its switch positive dirction.
As the described further prioritization scheme being applicable to the Fault Locating Method of power distribution network operation with closed ring, switch terminal is FTU or DTU.
The present invention adopts technique scheme, has following beneficial effect:
(1) a kind of Fault Locating Method being applicable to power distribution network operation with closed ring is proposed, the malfunction that adjacent switch terminal peer-to-peer communications real-time, interactive gathers, current direction information and switch opening and closing state information, detect fault with do not detect the switch of fault according to the malfunction of all adjacent switches of its section offside and power positive and negative whether consistent with this switch come positioning switch fault section, image set Chinese style FEEDER AUTOMATION is not needed like that the fault relevant information in a region to be uploaded to main website or substation, fault diagnosis is carried out by main website or substation, do not need yet on the spot order coincidence system like that with the power failure in time and non-faulting region, even complete the isolation of fault with the impact system that repeatedly overlaps for cost, location rapidly and efficiently and isolation are realized to the short trouble that occurs in operation with closed ring distribution network line, improve power supply real-time, security, reliability,
(2) the invention allows for switch positive dirction defining method that is a kind of and adjacent switch " face-to-face, back-to-back ", such definition switch positive dirction makes switch, and when localization of fault, no matter how complicated rack has, do not need to consider network trend, do not need to consider that this switch is in upstream or downstream, each switch is the location of complete independently fault and isolation separately.
The aspect that the present invention adds and advantage will part provide in the following description, and these will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The switch positive dirction determining step that Fig. 1 (a) to Fig. 1 (c) is switch each in rack.
Fig. 2 shares fault relevant information schematic diagram between adjacent switch in rack.
Fig. 3 is the fault schematic diagram under open loop and cyclization hybrid operation mode.
Fig. 4 is the fault schematic diagram under Electromagnetic coupling mode.
Embodiment
Being described below in detail embodiments of the present invention, is exemplary below by the embodiment be described with reference to the drawings, and only for explaining the present invention, and can not be interpreted as limitation of the present invention.
Those skilled in the art will appreciate that unless otherwise defined, all terms used herein have (comprising technical term and scientific terminology) the identical meaning of the general understanding of the ordinary technical staff in the technical field of the invention.Should also be understood that those terms defined in such as general dictionary should be understood to have the meaning consistent with the meaning in the context of prior art, unless and define as here, can not explain by idealized or too formal implication.
For ease of the understanding to the embodiment of the present invention, be further explained explanation below in conjunction with accompanying drawing for several specific embodiment, and each embodiment does not form the restriction to the embodiment of the present invention.
In this example, each switch is by a FTU (FeederTerminalUnit, feeder terminal unit)/DTU (DistributionTerminalUnit, distribution substation institute terminal) manage, the remote signalling of the real-time refresh switch of every platform FTU/DTU and telemetry intelligence (TELINT), and possess the ability of switch being carried out to separating brake and closing operation.
In this example, the FTU/DTU of each switch, according to the topology of reality, configures the annexation of all adjacent switches of this switch and its both sides, and guarantees to set up reliable peer-to-peer communications relation respectively with the FTU/DTU of its both sides adjacent switch.
1 switch positive dirction is specified
1) the switch positive dirction of initialize switch is defined.Choose certain switch in rack (generally choosing power supply point place switch), specify its switch positive dirction arbitrarily, point to section II side by section I side or point to section I side by section II side.
2) the switch positive dirction of all switches that definition is adjacent with initialize switch.Concerning certain adjacent switch of initialize switch, if the switch positive dirction of initialize switch is defined as point to this switch, then the switch positive dirction of this switch is also defined as sensing initialize switch, and this rule is called for short " face-to-face "; If the switch positive dirction of initialize switch is defined as this switch dorsad, then the switch positive dirction of this switch is also defined as initialize switch dorsad, and this rule is called for short " back-to-back ".
3) according to 2) described by adjacent switch " face-to-face, back-to-back " mode determine the switch positive dirction of other switches step by step.
In this example, the switch positive dirction of all switches of K1 ~ K10 in rack be determined, first need the switch positive dirction defining initialize switch, specify the switch positive dirction of K3 switch to point to D section, as shown in Fig. 1 (a) by C section here; So concerning the adjacent switch K4 of K3 switch, the switch positive dirction of K3 switch points to this switch-side, therefore determine that the switch positive dirction of K4 switch points to D section by E section, equally concerning the adjacent switch K2 of K3 switch, switch positive dirction this switch-side dorsad of K3 switch, therefore determine that the switch positive dirction of K2 switch points to B section, as shown in Fig. 1 (b) by C section.According to upper type, one-level level the switch positive dirction of all switches in rack can be determined.As shown in Fig. 1 (c).
2 adjacent switch information interactions
As shown in Figure 2, two information sharing this switch by respective FTU/DTU to the other side between adjacent switch in network frame topology, comprising: whether fault detected, current direction and switch opening and closing state.
Whether fault being detected---O (OverI), does not detect that fault is designated as 0, detects that fault is 1.
The flow direction of electric current---V (Vector), the flow direction according to the power determination electric current of switch: when certain switch power is timing, this switching current flows to identical with switch positive dirction, and current direction is identical with positive dirction is designated as 0; When certain switch power is for time negative, this switching current flows to switch positive dirction anti-, and current direction is contrary with positive dirction is designated as 1.
Switch deciliter state---S (State), on off state is that separating brake is designated as 0, and state is that combined floodgate is designated as 1.
O decision method: the overcurrent/zero-sequence current definite value of this switch of being adjusted by FTU/DTU, is then judged to be 1 when actual current/zero-sequence current is greater than definite value, is less than definite value and is then judged to be 0;
V decision method: take voltage as reference, when the flow direction that FTU/DTU collects switching current is consistent with the switch positive dirction of this switch, the Vector of this switch is judged to be 0; When the flow direction that FTU/DTU collects switching current is contrary with the switch positive dirction of this switch, the Vector of this switch is judged to be 1.
S decision method: when switch is in gate-dividing state, this switch S tate is judged to be 0; When switch is in "on" position, this switch S tate is judged to be 1.
3 localization of fault
In topology, the FTU/DTU of each switch is according to the switch fault information of this switch and all switches adjacent with this switch, independently completes localization of fault separately.
The content of localization of fault:
Section---the F whether short dot connects at this switch
i/ F
iIif, the section I that short dot connects at this switch, then F
ibe judged to be 1, otherwise be 0; If the section II that short dot connects at this switch, then F
iIbe judged to be 1, otherwise be 0.
The criterion of localization of fault:
If switch section I offside has m adjacent switch, switching information is designated as O respectively
i1, V
i1, S
i1..., O
im, V
im, S
im, section I positioning result is designated as F
i.Switch section II offside has n adjacent switch, and switching information is designated as O respectively
iI1, V
iI1, S
iI1..., O
iIn, V
iIn, S
iIn, section II positioning result is designated as F
iI.
1) concerning switch fault being detected, if in all adjacent switches of its section I offside, do not have switch fault to be detected, or allly in these switches detect that the power of the switch of fault is positive and negative all consistent with this switch, then judge that short dot is at this switch section I.This switch section II locates in like manner.
2) concerning fault not detected and the switch being in "on" position, if in all adjacent switches of its section I offside, only have a switch fault to be detected, or allly in these switches detect that the power of the switch of fault is positive and negative all consistent, then judge that short dot is at this switch section I.This switch section II locates in like manner.
This example, by the positioning analysis to section short trouble same under two kinds of methods of operation, sets forth the logic of localization of fault.
In this example, as shown in Figure 3, this rack takes open loop and cyclization hybrid operation mode.K7 switch is as interconnection switch.After E section is short-circuited fault, in this rack, K1 ~ K4, K9 and K10 switch detects fault, and other switches do not detect fault; Detect in the switch of fault, the power of K1, K3 and K10 switch is just, the power of K2, K4 and K9 switch is negative.According to localization of fault principle:
Concerning K9 switch, this switch detects fault, and power is negative.This switch J only has side K10 switch fault to be detected, but the power of K10 switch is just, inconsistent with this switch, and therefore fault does not occur in this switch J lateral areas section; This switch E only has side K4 switch fault to be detected, and the power of K4 switch is negative, consistent with this switch, and therefore fault occurs in E lateral areas section, and this switch needs tripping operation with isolated fault.
Concerning K4 switch, this switch detects fault, and power is negative.This switch D only has side K3 switch fault to be detected, but the power of K3 switch is just, inconsistent with this switch, and therefore fault does not occur in this switch D lateral areas section; This switch E only has side K9 switch fault to be detected, and the power of K9 switch is negative, consistent with this switch, and therefore fault occurs in E lateral areas section, and this switch needs tripping operation with isolated fault.
Concerning K5 switch, this switch does not detect fault.This switch F side does not have switch fault to be detected, and therefore fault does not occur in this switch F lateral areas section; This switch E only has K4 and K9 fault to be detected in side, and K4 and K9 power is negative, and therefore fault occurs in E lateral areas section, and this switch needs tripping operation with isolated fault.
In this example, as shown in Figure 4, Electromagnetic coupling mode taked by this rack, and namely arbitrary load all has multiple power supply to power simultaneously.After E section is short-circuited fault, in this rack, K1 ~ K10 switch all detects fault; Detect in the switch of fault, the power of K1, K3, K6, K8 and K10 switch is just, the power of K2, K4, K5, K7 and K9 switch is negative.According to localization of fault principle:
Concerning K9 switch, this switch detects fault, and power is negative.This switch J only has side K10 switch fault to be detected, but the power of K10 switch is just, inconsistent with this switch, and therefore fault does not occur in this switch J lateral areas section; This switch E only has side K4 and K5 switch fault to be detected, and the power of K4 and K5 switch is negative, consistent with this switch, and therefore fault occurs in E lateral areas section, and this switch needs tripping operation with isolated fault.
Concerning K4 switch, this switch detects fault, and power is negative.This switch D only has side K3 switch fault to be detected, but the power of K3 switch is just, inconsistent with this switch, and therefore fault does not occur in this switch D lateral areas section; This switch E only has side K9 and K5 switch fault to be detected, and the power of K9 and K5 switch is negative, consistent with this switch, and therefore fault occurs in E lateral areas section, and this switch needs tripping operation with isolated fault.
In sum, the present invention adopts technique scheme, has following beneficial effect:
(1) a kind of Fault Locating Method being applicable to power distribution network operation with closed ring is proposed, the malfunction that adjacent switch terminal peer-to-peer communications real-time, interactive gathers, current direction information and switch opening and closing state information, detect fault with do not detect the switch of fault according to the malfunction of all adjacent switches of its section offside and power positive and negative whether consistent with this switch come positioning switch fault section, image set Chinese style FEEDER AUTOMATION is not needed like that the fault relevant information in a region to be uploaded to main website or substation, fault diagnosis is carried out by main website or substation, do not need yet on the spot order coincidence system like that with the power failure in time and non-faulting region, even complete the isolation of fault with the impact system that repeatedly overlaps for cost, location rapidly and efficiently and isolation are realized to the short trouble that occurs in operation with closed ring distribution network line, improve power supply real-time, security, reliability,
(2) the invention allows for switch positive dirction defining method that is a kind of and adjacent switch " face-to-face, back-to-back ", such definition switch positive dirction makes switch, and when localization of fault, no matter how complicated rack has, do not need to consider network trend, do not need to consider that this switch is in upstream or downstream, each switch is the location of complete independently fault and isolation separately.
Claims (5)
1. be applicable to the Fault Locating Method of power distribution network operation with closed ring, it is characterized in that: the short circuit fault of power distribution network that described method is used for Electromagnetic coupling or open loop and cyclization mixed running is located, in power distribution network, each switchgear distribution has terminal, the malfunction that adjacent switch terminal peer-to-peer communications real-time, interactive gathers, current direction information and switch opening and closing state information, according to the switch positive dirction of each switch in face-to-face or back-to-back principle determination power distribution network
Switch to fault being detected: if do not have switch fault to be detected in all adjacent switches of its any section offside, or, detect that the power of the switch of fault is positive and negative all consistent with this switch in all adjacent switches of this section offside, then judge that short dot is at this section of this switch
To fault not detected and being in the switch of "on" position: if only have a switch fault to be detected in all adjacent switches of its any section offside, or, detect in all adjacent switches of this section offside that the power of the switch of fault is positive and negative all consistent, then judge that short dot is at this section of this switch.
2. the Fault Locating Method being applicable to power distribution network operation with closed ring according to claim 1, is characterized in that, according to the concrete steps of the switch positive dirction of each switch in face-to-face or back-to-back principle determination power distribution network is:
A, determine initialize switch positive dirction: specify with any switch and point to the direction of another section for positive dirction for initialize switch from its arbitrary section;
B, determine the positive dirction of all switches adjacent with initialize switch:
For the adjacent switch that initialize switch positive dirction is pointed to, to point to the direction of initial switch for positive dirction,
For deviate from initialize switch positive dirction point to adjacent switch, with initial switch pros in the opposite direction for positive dirction;
C, determine the positive dirction of other switch step by step according to the defining method of all switch positive dirctions adjacent with initialize switch.
3. the Fault Locating Method being applicable to power distribution network operation with closed ring according to claim 1 and 2, is characterized in that, the method that switch terminal gathers fault status information is: when actual current or zero-sequence current are greater than setting valve, be judged to fault to be detected; Otherwise, be judged to fault not detected.
4. the Fault Locating Method being applicable to power distribution network operation with closed ring according to claim 1 and 2, it is characterized in that, the method that switch terminal gathers current direction information is: be timing at switch power, judges that the current direction of this switch is identical with its switch positive dirction; At switch power for time negative, judge that the current direction of this switch is contrary with its switch positive dirction.
5. the Fault Locating Method being applicable to power distribution network operation with closed ring according to claim 1, is characterized in that, switch terminal is FTU or DTU.
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| CN109655709A (en) * | 2018-10-19 | 2019-04-19 | 南京海兴电网技术有限公司 | A kind of Fault Locating Method based on distributed feeder automation |
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| CN113589102A (en) * | 2021-07-31 | 2021-11-02 | 江苏大烨智能电气股份有限公司 | FTU-based broken line fault section positioning method and system |
| CN114184888A (en) * | 2021-11-30 | 2022-03-15 | 贵州电网有限责任公司 | Fault positioning method for dual-power supply line |
| CN114336544A (en) * | 2021-12-14 | 2022-04-12 | 南京瀚元科技有限公司 | Self-adaptive feeder automation algorithm for hybrid net rack |
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| CN113295968A (en) * | 2021-06-25 | 2021-08-24 | 广东电网有限责任公司 | Fault positioning method for multi-source information of power distribution network master station |
| CN113589102A (en) * | 2021-07-31 | 2021-11-02 | 江苏大烨智能电气股份有限公司 | FTU-based broken line fault section positioning method and system |
| CN113589102B (en) * | 2021-07-31 | 2024-07-30 | 江苏大烨智能电气股份有限公司 | FTU-based broken line fault section positioning method and system |
| CN114184888A (en) * | 2021-11-30 | 2022-03-15 | 贵州电网有限责任公司 | Fault positioning method for dual-power supply line |
| CN114184888B (en) * | 2021-11-30 | 2025-03-11 | 贵州电网有限责任公司 | A method for locating faults in dual power supply lines |
| CN114336544A (en) * | 2021-12-14 | 2022-04-12 | 南京瀚元科技有限公司 | Self-adaptive feeder automation algorithm for hybrid net rack |
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| CN105548801B (en) | 2018-12-07 |
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