CN105515199A - Distributed fault detection method for intelligent power distribution network - Google Patents
Distributed fault detection method for intelligent power distribution network Download PDFInfo
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- CN105515199A CN105515199A CN201610021123.2A CN201610021123A CN105515199A CN 105515199 A CN105515199 A CN 105515199A CN 201610021123 A CN201610021123 A CN 201610021123A CN 105515199 A CN105515199 A CN 105515199A
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- H02J13/0006—
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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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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Abstract
The invention discloses a distributed fault detection method for an intelligent power distribution network. The method comprises the following steps that a protective range of each intelligent power distribution terminal is determined; each intelligent power distribution terminal communicates with an adjacent intelligent power distribution terminal in a peer-to-peer manner, and interacts network topology structure information of a position where the intelligent power distribution terminal is located; each intelligent power distribution terminal judges a fault position on the basis of a regional longitudinal comparison protection principle and according to fault information obtained by calculation of the acquired adjacent intelligent power distribution terminal; after a line with the fault position is determined, a switch type corresponding to the line is determined according to a network topology structure, and a corresponding fault isolation strategy is made according to the switch type. The method disclosed by the invention has the beneficial effects that each intelligent power distribution terminal can interact the fault information with the adjacent intelligent power distribution terminal in the peer-to-peer manner according to the current network topology structure, so that a faulty region is accurately and effectively isolated, and the requirements on quickness, flexibility and reliability of fault detection and isolation of the intelligent power distribution network are met.
Description
Technical field
The invention belongs to intelligent distribution network fault detection technique field, particularly a kind of intelligent distribution network distributed fault detection method.
Background technology
Power distribution network is responsible for the effect to all kinds customer power supply, and the safety and reliability that power distribution network runs directly affects the safety and reliability of power supply.Distribution net work structure is comparatively complicated, and connection type is various, and various branch is numerous, is mostly distributed in the place that population is comparatively concentrated, service conditions rather harsh, and the fault caused by outside manpower or mechanical reason is more.In recent years along with development and the application of distributed power generation (DG) technology, make the structure of power distribution network and operational mode complicated further, the probability broken down also increased further.After power distribution network breaks down, often cause the power failure of user's different time in certain area, time serious, larger economic loss may be brought, even the long-time power failure of initiation area.
The reason that power distribution network breaks down is a lot, and such as equipment self reason, weather reason, outside destroy etc., fault has very strong randomness and Unpredictability.The consequence that fault causes is often relatively more serious, such as equipment damage, and large-area power-cuts even threatens personal safety around, brings larger economic loss.The best measure of reply fault is equipped with good protective relaying device; reliably fault can be excised when a failure occurs it in hundreds of millisecond even a few tens of milliseconds; reduce the adverse effect that fault is brought as far as possible, guarantee the safety and reliability of non-faulting block supply.
People are generally inadequate to the attention degree of distribution network construction for a long time; electric network composition is weak, reasonable not; rate of breakdown is higher; but the protective relaying device be equipped with generally adopts stage overcurrent protection principle; block switch is on-load switch but not circuit breaker substantially, and after causing trouble occurs, the action delay of relaying protection is longer, and process of fault isolation is complicated and power supply interrupted district is larger; interruption duration is also longer, has had a strong impact on the reliability of power supply.In addition, current various types of distributed power source due to power less, export electrical network lower grade, power distribution network is incorporated to greatly mainly with direct grid-connected or with the form of microgrid, this brings larger change by the structure of power distribution network and operational mode, after making fault occur there is larger change in the Changing Pattern of electric parameters simultaneously, traditional stage overcurrent protection principle is difficult to adapt to above-mentioned change, after making power distribution network mode fault, the Fault Isolation time is longer, power failure influence area is larger, therefore must for the intelligent distribution network comprising distributed power source, propose rationally, effective fault detect and partition method.
The intelligent distribution network fault detect of current proposition and partition method mainly contain following two classes:
(1) traditional protection philosophy is improved.Such as the setting principle of stage overcurrent protection principle is modified, the basis of overcurrent element increases malfunction directional element, adopt fault distance element or current differential element etc.These class methods can improve protective value to a certain extent, but can increase the complexity of relaying configuration scheme, and the reliability of protection can affect adversely.In addition the shortage flexibility of such scheme and adaptability, is not suitable for network configuration and operational mode changes power distribution network frequently.
(2) distribution automation system isolated fault is relied on.Such scenario-frame more complicated, need jointly to complete by the distribution terminal being arranged on each block switch place, fast messaging network and distribution automation main station system, distribution terminal is responsible for the electric parameters and the switching value information that gather installation place, and carry out simple calculation of fault, the fault message that distribution automation main station system is uploaded according to each distribution terminal judges abort situation, and makes the Fault Isolation Strategy and be issued to the execution of corresponding distribution terminal by communication system.The dependence of such scheme to communication system and distribution automation main station system is higher, and informational needs alternately repeatedly, needs longer time delay, also there is the problem of reliability aspect between distribution terminal and distribution automation main station system.
Summary of the invention
The object of the invention is to solve the problem, a kind of intelligent distribution network distributed fault detection method is provided, the method is that core completes with Intelligent power distribution terminal, after fault occurs, dispersion is arranged on the voltage of Intelligent power distribution terminal based on installation place at line outlet place and each block switch place, the electric quantity information such as electric current, the fault messages such as calculating place fault current and fault direction, based on peer-to-peer communications mode and current network topology structure, Intelligent power distribution terminal and adjacent Intelligent power distribution terminal interaction fault information, adopt the protection philosophy of region longitudinal comparison, determine abort situation fast, and according to network topology structure, whether switch has the factors such as cutting-off of short-circuit current capacity, formulate rational the Fault Isolation Strategy.
For achieving the above object, the present invention adopts following technical proposals:
A kind of intelligent distribution network distributed fault detection method, comprises the following steps:
(1) Intelligent power distribution terminal initialization operation; Comprise: messaging parameter initialization, network topology parameters initialization and electrical network parameter and the initialization of protection definite value; Determine the protection range of each Intelligent power distribution terminal simultaneously;
(2) Intelligent power distribution terminal is based on the switch number stored during initialization and adjacent legs information, searches adjacent node, i.e. the installation place of adjacent Intelligent power distribution terminal; Each Intelligent power distribution terminal and adjacent Intelligent power distribution terminal peer-to-peer communications, the network topology information at mutual position place separately;
(3) after breaking down, first the Intelligent power distribution terminal experiencing fault message calculates fault current and fault direction based on the electric quantity information of installed position, the fault message that described Intelligent power distribution terminal calculates according to the adjacent Intelligent power distribution terminal got, judges abort situation based on region longitudinal comparison protection philosophy;
(4) after determining the circuit at abort situation place, determine the switchtype corresponding with described circuit according to network topology structure, make corresponding the Fault Isolation Strategy according to switchtype.
In described step (1), determine that the principle of the protection range of each Intelligent power distribution terminal is:
The protection range of Intelligent power distribution terminal comprises place circuit and adjacent lines; Intelligent power distribution terminal provides main protection function, for adjacent lines provides backup protection function for place circuit.
In described step (2), if there is branch switch displacement, block switch displacement on distribution line or occur branch road increasing, subtract situation, send network topology lastest imformation by the Intelligent power distribution terminal that respective switch is corresponding, adjacent Intelligent power distribution terminal receives this information and upgrades corresponding network topology structure.
In described step (3), after breaking down, whether can experience the fault current overflow protecting element corresponding to each Intelligent power distribution terminal according to Intelligent power distribution terminal and carry out first time demarcation;
The power directional element corresponding to each Intelligent power distribution terminal according to the direction whether having fault current to flow through and fault current flows through carries out second time and demarcates;
The result that second time is demarcated is converted into binary system calibration result;
The result that first time is demarcated be converted into binary second time calibration result and carry out logic and operation, obtain the breakdown judge information that each Intelligent power distribution terminal is final;
Intelligent power distribution terminal again with other adjacent terminal interaction breakdown judge information, thus determine the particular location of fault.
Described to overcurrent element carry out first time demarcate principle be:
If intelligent terminal can experience fault current, then the judged result of overcurrent element numeral " 1 " is represented, otherwise represent by digital " 0 ".
Described to direction component carry out second time demarcate principle be:
The direction being pointed to circuit by main power source is positive direction, represents by numeral " 1 "; The direction being pointed to main power source by circuit, DG or each branch is in the other direction, represents by numeral "-1 "; If due to impression less than fault current or cause because fault current is less cannot failure judgement direction time, the result of the action of direction component represents by digital " 0 ";
The method of carrying out binary system conversion is:
Retain the judged result of positive direction, represent by numeral " 1 ";
Be in the other direction for judged result and cannot the direction component in failure judgement direction, its judged result all represents by digital " 0 ".
In described step (3), judge that the method for abort situation is specially based on region longitudinal comparison protection philosophy:
If the breakdown judge logic of certain Intelligent power distribution terminal S is " 1 ", this Intelligent power distribution terminal S is judged as positive direction overcurrent, abort situation is positioned at the positive direction place of this Intelligent power distribution terminal S, then the Intelligent power distribution terminal peer-to-peer communications that this intelligent terminal S is only adjacent with its forward;
If the breakdown judge logic of the adjacent Intelligent power distribution terminal of forward is " 0 ", then determine that fault is positioned at the forward protection range of this Intelligent power distribution terminal S, be namely positioned on the forward circuit at this intelligent terminal S place;
If the breakdown judge logic of the adjacent Intelligent power distribution terminal of forward is " 1 "; then determine that fault is positioned in the positive direction of adjacent end; this Intelligent power distribution terminal S does not enter main protection function; according to the breakdown judge result of adjacent Intelligent power distribution terminal, determine that this Intelligent power distribution terminal S is the need of providing backup protection function.
In described step (3), judge that the method for abort situation is specially based on region longitudinal comparison protection philosophy:
If the overflow protecting element judged result of certain Intelligent power distribution terminal S is 1, power directional element judged result is "-1 ", this Intelligent power distribution terminal S is judged as overcurrent in the other direction, abort situation is positioned at the opposite direction place of this Intelligent power distribution terminal S, then the Intelligent power distribution terminal peer-to-peer communications that this intelligent terminal S is only oppositely adjacent with it;
If the breakdown judge logic of reverse adjacent Intelligent power distribution terminal is " 1 ", then determine that fault is positioned at the reverse protection scope of this Intelligent power distribution terminal S, be namely positioned on reverse circuit corresponding to this intelligent terminal;
If the breakdown judge logic of reverse adjacent Intelligent power distribution terminal is " 0 "; then determine that fault is positioned in the opposite direction of reverse adjacent end; this Intelligent power distribution terminal S does not enter main protection function; according to the breakdown judge result of reverse adjacent Intelligent power distribution terminal, determine that this Intelligent power distribution terminal S is the need of providing backup protection function.
In described step (4), after determining the circuit at abort situation place, determine and the switch that described circuit is directly connected according to network topology structure, if be can the circuit breaker of cutting-off of short-circuit electric current for each switch, then the switch that directly tripping is adjacent with fault zone; If only have outlet switch to be circuit breaker, other switch is on-load switch, then first tripping circuit breaker trip short circuit current, and then the on-load switch isolated fault that tripping is directly connected with fault zone, and the circuit breaker that finally overlaps again recovers the power supply to non-faulting region.
The invention has the beneficial effects as follows:
By the peer-to-peer communications between Intelligent power distribution terminal, current network topology structure can be determined in real time, and when an error occurs, working method based on peer-to-peer communications compares the breakdown judge information of Intelligent power distribution terminal in fault zone, thus realize fast, reliably abort situation detect and effective Fault Isolation, meet intelligent distribution network to the rapidity of fault detect and isolation, flexibility and reliability requirement.
Accompanying drawing explanation
Fig. 1 is intelligent distribution network structural representation;
Fig. 2 is the forward region internal fault decision logic block diagram based on region Longitudinal comparison principle;
Fig. 3 is the zones of inversions internal fault decision logic block diagram based on region Longitudinal comparison principle.
Embodiment:
Below in conjunction with accompanying drawing and example, the present invention will be further described:
A distributed fault detection method for intelligent distribution network, comprises the following steps:
(1) be each Intelligent power distribution terminal determination protection range.Generally, Intelligent power distribution terminal needs for place circuit provides main protection function, for adjacent lines provides backup protection function, so the protection range of Intelligent power distribution terminal comprises place circuit and adjacent lines.It should be noted that, the determination principle of above-mentioned protection range is rule, can determine that each Intelligent power distribution terminal determines respective protection range completely according to different needs.Determine that the object of protection range is the interactive object in order to make each Intelligent power distribution terminal clear failure information.
In figure, S represents Intelligent power distribution terminal, and Intelligent power distribution terminal and circuit outlet switch, block switch are identical with the grid-connected position of the switch, and the two represents with prosign, and L represents circuit, and DG represents distributed power source.The determination of Intelligent power distribution terminal protection range is described for S4.
Switch S 4 is block switch; switch both sides are connection line L2 and L4 respectively, and no matter L2 or L4 breaks down, and all needs cut-off switch S4 with isolated fault; so circuit L2 and L4 is the place circuit of Intelligent power distribution terminal S4, S4 should be L2 and L4 and provides main protection function.The circuit adjacent with L2 is circuit L1 and L3, and the circuit adjacent with L4 is L5 and L6, and above-mentioned circuit is the adjacent lines of Intelligent power distribution terminal S4, and S4 should be L1, L3, L5 and L6 and provides backup protection function.Above-mentioned Intelligent power distribution terminal protection range determination principle determines according to the scope of main protection and backup protection, and this is rule, can determine protection range flexibly completely according to the difference of network topology structure and actual needs.
(2) after determining the protection range of Intelligent power distribution terminal; each Intelligent power distribution terminal communicates with adjacent Intelligent power distribution terminal; the network topology information at mutual position place separately; determine in protection range, to correspond to which Intelligent power distribution terminal; thus when determining based on region longitudinal comparison protection philosophy failure judgement, need and which Intelligent power distribution terminal interaction fault information.
Network topology information reciprocal process is described for Intelligent power distribution terminal S4.
S4 only stores the network topological information at position place when initialization, i.e. circuit L2 and L4 that connect of switch S 4 and both sides thereof.When carrying out network topology structure and automatically identifying, can find corresponding adjacent Intelligent power distribution terminal according to circuit L2 is S2, therefore can determine that Intelligent power distribution terminal S4 and S2 carries out fault message alternately, just can judge L2 whether fault.In like manner, it is S5 and S6 that Intelligent power distribution terminal S4 can find corresponding adjacent Intelligent power distribution terminal according to circuit L4, therefore Intelligent power distribution terminal S4 and S5 and S6 carries out fault message alternately, just can judge L4 whether fault.By that analogy; Intelligent power distribution terminal S2 correspond to circuit L1, and the opposite side of circuit L1 correspond to Intelligent power distribution terminal S1, it can thus be appreciated that circuit L1 is the backup protection scope of Intelligent power distribution terminal S4; and backup protection to be provided for circuit L1, need and Intelligent power distribution terminal S1 interaction fault information.The opposite side of Intelligent power distribution terminal S5 and S6 correspond to circuit L5 and L6; therefore circuit L5 and L6 is also the backup protection scope of Intelligent power distribution terminal S4; and backup protection to be provided for circuit L5; need and Intelligent power distribution terminal S5 interaction fault information; backup protection to be provided for circuit L6, need and Intelligent power distribution terminal S6 interaction fault information.
(3) if the block switch displacement on some branch switch or distribution line; when causing network topology structure to change; the Intelligent power distribution terminal refresh network topology information that displacement Switch Controller is answered; and communicate with adjacent Intelligent power distribution terminal; adjacent Intelligent power distribution terminal is refresh network topological structure thereupon, redefines the information interaction object of region pilot protection.
(4) after breaking down; first the Intelligent power distribution terminal experiencing fault message calculates fault current and fault direction based on the electric quantity information of installed position; then based on the protection range determined in advance and information interaction object; by communication network (such as fiber optic Ethernet) in the mode of peer-to-peer communications; obtain the fault message that other Intelligent power distribution terminal calculates; based on region longitudinal comparison protection philosophy, judge abort situation fast, reliably.
Based on region longitudinal comparison protection philosophy, the method that abort situation judges is described below.
Still illustrate for the Intelligent power distribution terminal S4 in Fig. 1.Assumed fault occurs on L4, and now main power source 1 can provide larger short circuit current to fault point, and therefore Intelligent power distribution terminal S1, S2 and S4 can experience fault current, and the direction of fault current is for point to circuit L4 from main power source 1.DG1 also can provide short circuit current to fault point, but the size of short circuit current depends on the size of DG1 capacity, if DG1 capacity is comparatively large, Intelligent power distribution terminal S3 also can experience fault current, and circuit L4 is pointed to from DG1 in fault current direction; If DG1 capacity is less, Intelligent power distribution terminal S3 may experience less than fault current.In like manner, DG2 also can provide short circuit current to fault point, if DG2 capacity is enough large, Intelligent power distribution terminal S5 and S8 all can experience fault current, and circuit L4 is pointed to from DG2 in fault current direction.Specify in the present invention: if intelligent terminal can experience fault current, then the judged result of overflow protecting element numeral " 1 " is represented, otherwise represent by digital " 0 "; Specify that the direction being pointed to circuit by main power source is positive direction, represent by numeral " 1 ", the direction being pointed to main power source by circuit, DG or each branch is in the other direction, represent by numeral "-1 ", if because impression is less than fault current or when causing sensitivity not enough because fault current is less, the result of the action of direction component represents by digital " 0 ".
Final breakdown judge information is a binary number, represents whether corresponding Intelligent power distribution terminal has experienced the fault current of positive direction.If so, breakdown judge information is " 1 ", otherwise is " 0 ".Intelligent power distribution terminal again with other adjacent terminal interaction breakdown judge information, thus determine the particular location of fault.
Therefore, when fault point is positioned at circuit L4 and DG1, DG2 have an enough large capacity, the judged result of each Intelligent power distribution terminal to fault current and direction thereof is as shown in the table.
Table 1 overcurrent element judged result
Table 2 malfunction directional element judged result
For the ease of carrying out logical operation, need to do binary system process to the judged result of malfunction directional element.Because the capacity of main power source is comparatively large, the short circuit current provided by main power source when system jam also can be comparatively large, and the judged result of corresponding Intelligent power distribution terminal to fault current and fault direction has higher sensitivity and reliability.Compare main power source, the capacity of DG is less, and the short circuit current provided by DG when system jam may be less, and corresponding Intelligent power distribution terminal can be influenced to the sensitivity of fault current and fault direction judged result and reliability.Therefore only retaining the judged result of positive direction, is in the other direction for judged result and cannot the direction component in failure judgement direction, and its judged result all represents by digital " 0 ".Therefore in table 2, the judged result binary representation of malfunction directional element is as shown in table 3.
The table 3 malfunction directional element judged result of binary representation
The judged result of direction component in the judged result of overcurrent element in table 1 and table 3 is done logic "and" operation, using the result that obtains as the final breakdown judge information of each Intelligent power distribution terminal, as shown in table 4.
The breakdown judge information of each Intelligent power distribution terminal of table 4
Intelligent power distribution terminal can judge two amounts: one is fault current, and shown in table 1, another is fault direction, shown in table 2.These two amounts constitute the final breakdown judge information of Intelligent power distribution terminal.But in binary computations, there is not "-1 " this number.So with table 3 substitution list 2, the element of table 1 and table 3 correspondence is done logic "and" operation, obtains table 4.That is, although each intelligent terminal calculates two values, finally externally only provide the binary value that final.
Based on the forward of region Longitudinal comparison principle and zones of inversions internal fault decision logic respectively as shown in Figures 2 and 3.
Because Intelligent power distribution terminal S4 is judged as positive direction overcurrent, so abort situation should be positioned at the positive direction place of S2, namely pointed to the direction of circuit L4 by S4.Therefore S4 only need the Intelligent power distribution terminal adjacent with forward and S5 and S6 peer-to-peer communications; obtain the breakdown judge information of S5 and S6; as shown in Table 3; the breakdown judge information of S5 is " 0 "; the breakdown judge information of S6 is " 0 "; can determine that fault is positioned at the forward protection range of Intelligent power distribution terminal S4 according to breakdown judge logic, namely on circuit L4.
Assumed fault is positioned on circuit L5, and now the breakdown judge information of Intelligent power distribution terminal S5 will be the breakdown judge Information invariability of " 1 ", other Intelligent power distribution terminal.For Intelligent power distribution terminal S4; failure judgement will be positioned at its forward place; the Intelligent power distribution terminal S5 adjacent with forward and S6 peer-to-peer communications obtain its breakdown judge information; now the breakdown judge information of S5 is " 1 "; the breakdown judge information of S6 is " 0 "; fault can be determined not on the forward protection range and circuit L4 of Intelligent power distribution terminal S4 according to breakdown judge logic, not belong to the main protection scope of Intelligent power distribution terminal S4.
Assumed fault is positioned on circuit L2; now the malfunction directional element judged result of Intelligent power distribution terminal S4 is "-1 "; show that fault is positioned at the opposite direction place of S4; therefore its breakdown judge information is obtained with oppositely adjacent Intelligent power distribution terminal S2 peer-to-peer communications; now for S2; what occur is forward fault, therefore its breakdown judge information is " 1 ", can determine that fault is in the reverse protection scope and circuit L2 of Intelligent power distribution terminal S4 according to breakdown judge logic.
(5) after determining abort situation, the switchtype information that the Intelligent power distribution terminal around fault zone is directly connected according to network topology information and circuit, makes the Fault Isolation Strategy.Can the circuit breaker of cutting-off of short-circuit electric current if each switch is, can switch directly around tripping fault zone, reach the object of quick isolated fault.If only have outlet switch to be circuit breaker, other switch is on-load switch, so needs first tripping circuit breaker trip short circuit current, and then the on-load switch isolated fault around tripping fault zone, and the circuit breaker that finally overlaps again recovers the power supply to non-faulting region.
If Intelligent power distribution terminal S4 failure judgement is positioned on circuit L4, based on aforesaid network topology structure recognition result, the known switch corresponding with circuit L4 is respectively S4, S5 and S6, therefore needs tripping switch S 4, S5 and S6 just can reach the object of thorough isolated fault circuit L4.If switch S 4 and S6 are on-load switch but not circuit breaker, do not possess the ability of disengagement failure electric current, now need to find the circuit breaker nearest from fault point to be outlet switch S1 according to network topological information, therefore first tripping S1 and grid-connected switch (grid-connected switch is generally circuit breaker) S6, cut off the short circuit current that each power supply flows to fault point, and then tripping on-load switch S4 and S5 isolated fault, finally coincidence outlet switch S1 recovers the power supply to non-faulting region.If circuit offside has interconnection switch, interconnection switch can be controlled and close, recover the power supply to other non-faulting power supply interrupted district.
Below in conjunction with system shown in Figure 1, illustrate the course of work of distributed fault detection and shielding system, assumed fault occurs on circuit L4.
After fault occurs, system power supply 1, DG1 and DG2 can provide short circuit current to fault point, suppose that the capacity of DG1 and DG2 is larger.Now Intelligent power distribution terminal S1, S2, S3, S4, S5, S8 can experience larger fault current, S6 and S7 correspond to load branch, and non-faulty current flows through, and therefore S6 and S7 impression is less than fault current.In each Intelligent power distribution terminal experiencing fault current, S1, S2 and S4 can be judged to forward fault, and S3, S5 and S8 can be judged to reverse fault.
The each Intelligent power distribution terminal experiencing fault all by communication system, in the mode of peer-to-peer communications, based on current network topology structure, can obtain the breakdown judge information in adjacent intelligent power distribution.Such as, for Intelligent power distribution terminal S2, because S2 is judged as positive direction overcurrent, therefore adjacent with forward Intelligent power distribution terminal S4 interaction fault judges information.S4 is also judged as forward overcurrent, can determine fault not on circuit L2 according to breakdown judge logic, but is positioned at the positive direction place of Intelligent power distribution terminal S4.Therefore Intelligent power distribution terminal S2 can not enter fault isolation routine, but according to the breakdown judge result of Intelligent power distribution terminal S4, to determine whether to provide backup protection function.Deterministic process and the S2 of Intelligent power distribution terminal S1 are similar.
For Intelligent power distribution terminal S5; because its breakdown judge information is reverse overcurrent; therefore with its Intelligent power distribution terminal S4 adjacent in the other direction and S6 interactive information; wherein S4 can be judged to forward overcurrent; and S6 impression is less than fault current; namely the Intelligent power distribution terminal that S5 is oppositely adjacent experiences reverse overcurrent without any a meeting, can determine that fault is positioned at the reverse protection scope of Intelligent power distribution terminal S5, namely on circuit L4 according to breakdown judge logic.
For Intelligent power distribution terminal S8, because its breakdown judge information is reverse overcurrent, therefore with its Intelligent power distribution terminal S5 adjacent in the other direction and S7 interactive information, wherein S5 also can be judged to reverse overcurrent, and S7 impression is less than fault current, can determine that fault is positioned at the opposite direction of Intelligent power distribution terminal S5 according to breakdown judge logic, not on circuit L5.Intelligent power distribution terminal S8 can not enter fault isolation routine, but according to the breakdown judge result of Intelligent power distribution terminal S5, to determine whether to provide backup protection function.
For Intelligent power distribution terminal S4; because its breakdown judge information is forward overcurrent; therefore adjacent with its positive direction Intelligent power distribution terminal S5 and S6 interactive information; wherein S5 can be judged to reverse overcurrent; and S6 impression is less than fault current; namely the Intelligent power distribution terminal that S4 forward is adjacent experiences forward overcurrent without any a meeting, can determine that fault is located in the forward protection range of Intelligent power distribution terminal S4, namely on circuit L4 according to breakdown judge logic.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. an intelligent distribution network distributed fault detection method, is characterized in that, comprises the following steps:
(1) Intelligent power distribution terminal initialization operation; Comprise: messaging parameter initialization, network topology parameters initialization and electrical network parameter and the initialization of protection definite value; Determine the protection range of each Intelligent power distribution terminal simultaneously;
(2) Intelligent power distribution terminal is based on the switch number stored during initialization and adjacent legs information, searches adjacent node, i.e. the installation place of adjacent Intelligent power distribution terminal; Each Intelligent power distribution terminal and adjacent Intelligent power distribution terminal peer-to-peer communications, the network topology information at mutual position place separately;
(3) after breaking down, first the Intelligent power distribution terminal experiencing fault message calculates fault current and fault direction based on the electric quantity information of installed position, the fault message that described Intelligent power distribution terminal calculates according to the adjacent Intelligent power distribution terminal got, judges abort situation based on region longitudinal comparison protection philosophy;
(4) after determining the circuit at abort situation place, determine the switchtype corresponding with described circuit according to network topology structure, make corresponding the Fault Isolation Strategy according to switchtype.
2. a kind of intelligent distribution network distributed fault detection method as claimed in claim 1, is characterized in that, in described step (1), determines that the principle of the protection range of each Intelligent power distribution terminal is:
The protection range of Intelligent power distribution terminal comprises place circuit and adjacent lines; Intelligent power distribution terminal provides main protection function, for adjacent lines provides backup protection function for place circuit.
3. a kind of intelligent distribution network distributed fault detection method as claimed in claim 1, it is characterized in that, in described step (2), if there is branch switch displacement, block switch displacement on distribution line or occur branch road increasing, subtract situation, send network topology lastest imformation by the Intelligent power distribution terminal that respective switch is corresponding, adjacent Intelligent power distribution terminal receives this information and upgrades corresponding network topology structure.
4. a kind of intelligent distribution network distributed fault detection method as claimed in claim 1, it is characterized in that, in described step (3), after breaking down, whether can experience the fault current overflow protecting element corresponding to each Intelligent power distribution terminal according to Intelligent power distribution terminal and carry out first time demarcation;
The power directional element corresponding to each Intelligent power distribution terminal according to the direction whether having fault current to flow through and fault current flows through carries out second time and demarcates;
The result that second time is demarcated is converted into binary system calibration result;
The result that first time is demarcated be converted into binary second time calibration result and carry out logic and operation, obtain the breakdown judge information that each Intelligent power distribution terminal is final;
Intelligent power distribution terminal again with other adjacent terminal interaction breakdown judge information, thus determine the particular location of fault.
5. a kind of intelligent distribution network distributed fault detection method as claimed in claim 4, is characterized in that, described to overcurrent element carry out first time demarcate principle be:
If intelligent terminal can experience fault current, then the judged result of overcurrent element numeral " 1 " is represented, otherwise represent by digital " 0 ".
6. a kind of intelligent distribution network distributed fault detection method as claimed in claim 4, is characterized in that, described to direction component carry out second time demarcate principle be:
The direction being pointed to circuit by main power source is positive direction, represents by numeral " 1 "; The direction being pointed to main power source by circuit, DG or each branch is in the other direction, represents by numeral "-1 "; If due to impression less than fault current or cause because fault current is less cannot failure judgement direction time, the result of the action of direction component represents by digital " 0 ";
The method of carrying out binary system conversion is:
Retain the judged result of positive direction, represent by numeral " 1 ";
Be in the other direction for judged result and cannot the direction component in failure judgement direction, its judged result all represents by digital " 0 ".
7. a kind of intelligent distribution network distributed fault detection method as claimed in claim 6, is characterized in that, in described step (3), judges that the method for abort situation is specially based on region longitudinal comparison protection philosophy:
If the breakdown judge logic of certain Intelligent power distribution terminal S is " 1 ", this Intelligent power distribution terminal S is judged as positive direction overcurrent, abort situation is positioned at the positive direction place of this Intelligent power distribution terminal S, then the Intelligent power distribution terminal peer-to-peer communications that this intelligent terminal S is only adjacent with its forward;
If the breakdown judge logic of the adjacent Intelligent power distribution terminal of forward is " 0 ", then determine that fault is positioned at the forward protection range of this Intelligent power distribution terminal S, be namely positioned on the forward circuit at this intelligent terminal S place;
If the breakdown judge logic of the adjacent Intelligent power distribution terminal of forward is " 1 "; then determine that fault is positioned in the positive direction of adjacent end; this Intelligent power distribution terminal S does not enter main protection function; according to the breakdown judge result of adjacent Intelligent power distribution terminal, determine that this Intelligent power distribution terminal S is the need of providing backup protection function.
8. a kind of intelligent distribution network distributed fault detection method as claimed in claim 6, is characterized in that, in described step (3), judges that the method for abort situation is specially based on region longitudinal comparison protection philosophy:
If the overflow protecting element judged result of certain Intelligent power distribution terminal S is 1, power directional element judged result is "-1 ", this Intelligent power distribution terminal S is judged as overcurrent in the other direction, abort situation is positioned at the opposite direction place of this Intelligent power distribution terminal S, then the Intelligent power distribution terminal peer-to-peer communications that this intelligent terminal S is only oppositely adjacent with it;
If the breakdown judge logic of reverse adjacent Intelligent power distribution terminal is " 1 ", then determine that fault is positioned at the reverse protection scope of this Intelligent power distribution terminal S, be namely positioned on reverse circuit corresponding to this intelligent terminal.
9. a kind of intelligent distribution network distributed fault detection method as claimed in claim 8; it is characterized in that; if the breakdown judge logic of reverse adjacent Intelligent power distribution terminal is " 0 "; then determine that fault is positioned in the opposite direction of reverse adjacent end; this Intelligent power distribution terminal S does not enter main protection function; according to the breakdown judge result of reverse adjacent Intelligent power distribution terminal, determine that this Intelligent power distribution terminal S is the need of providing backup protection function.
10. a kind of intelligent distribution network distributed fault detection method as claimed in claim 1, it is characterized in that, in described step (4), after determining the circuit at abort situation place, determine and the switch that described circuit is directly connected according to network topology structure, can the circuit breaker of cutting-off of short-circuit electric current if each switch is, then the switch that directly tripping is adjacent with fault zone; If only have outlet switch to be circuit breaker, other switch is on-load switch, then first tripping circuit breaker trip short circuit current, and then the on-load switch isolated fault that tripping is directly connected with fault zone, and the circuit breaker that finally overlaps again recovers the power supply to non-faulting region.
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