CN102411117B - Method for positioning short-circuit fault of distribution network based on distributed intelligent multi-calibration - Google Patents
Method for positioning short-circuit fault of distribution network based on distributed intelligent multi-calibration Download PDFInfo
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Abstract
The invention relates to a method for positioning a short-circuit fault of a distribution network based on distributed intelligent multi-calibration. The method comprises the following steps of: arranging a plurality of intelligent agents in the distribution network and establishing a modeled multilevel multi-verification short-circuit fault positioning rule for different operating modes of the distribution network; in the operation process of the distribution network, monitoring operation information of a local current distribution network in real time through each distributed intelligent agent; once the current is out of limit, sending a current out-of-limit signal to the directly-adjacent intelligent agent and a superior intelligent agent and checking whether a short-circuit fault early-warning signal exists locally; if so, assuring that the short-circuit fault happens locally; otherwise, waiting for receiving the current out-of-limit signal sent by the directly-adjacent intelligent agent; and after delaying the signal for time t, according to the local current out-of-limit signal and the received current out-of-limit signal, carrying out rule matching and multi-condition calibration to determine a fault diagnosis result by utilizing a local short-circuit fault positioning rule library and combining a wiring type of the distribution network and the position of the intelligent agent.
Description
Technical field
The invention belongs to Power System and its Automation field, be specifically related to a kind of short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence.
Background technology
As the most common failure in power distribution network, short trouble, if do not located as early as possible and isolating, likely causes the major accident such as equipment burnout, load dead electricity.
At present, short trouble relies on protection and isolating switch in power distribution network to realize location and isolation mostly.The method is not only subject to the restriction of breaker acting speed, and protection and isolating switch are prone to the phenomenon of malfunction, tripping.Meanwhile, dead electricity scope is excessive, is positioned at the short trouble on track section, after protection action isolation, tends to cause the dead electricity on whole piece circuit.In addition, in the power distribution network of multiple feed, the definite value of protective device with coordinate more complicatedly, be difficult to realize accurate location and the isolation of short trouble.
Distributed intelligence, as emerging technology, can effectively be simplified challenge, meets online real-time, robotization and intelligentized requirement.For the fault diagnosis of electrical network; can realize the local processing of local information; rely on mechanics of communication; can realize the interactive communication between intelligent body; coordinate than the original protection of electrical network; not only processing speed is fast, and the formulation of judgment rule, amendment are with supplementary more flexible, are applicable to the multiple power distribution network method of operation.Meanwhile, greatly simplified the protection problem such as adjust.In addition, only the boundary switch of action failure section, has dwindled power failure range, has improved accuracy and the reliability of localization of fault.
Short trouble localization method based on distributed intelligence, at present domestic existing a small amount of research.Some documents are studied the distribution network failure self-healing control technology based on distributed intelligence, Open loop and closed loop operation electrical power distribution network fault location method has been proposed, the method comprises following content: (1) is for open loop power distribution network, if a certain fault current that exceedes setting valve that flow through mutually of a switch, its intelligent electronic device sends to intelligent electronic device and the station level equipment of its adjacent switch the information that flows through fault current; Flow through fault current if a distribution region has and only have 1 end points to report, fault occurs in this distribution intra-zone; Otherwise fault does not just occur in this distribution intra-zone.(2) for closed loop power distribution network, if a certain fault current that exceedes setting valve that flow through mutually of a switch, its intelligent electronic device sends failure message, the direction of information content faults power to intelligent electronic device and the station level equipment of its adjacent switch.For a distribution region, if the fault power direction that its end points reports is all pointed to this intra-zone, fault occurs in this distribution intra-zone; If the fault power direction that a certain end points reports is pointed to this region exterior or its all end points all do not have reporting fault information, in this distribution region, just there is no fault.
The above-mentioned short trouble localization method based on distributed intelligence, can correctly carry out localization of fault in theory.But under actual motion environment, likely judge by accident; Need the information of waiting for that adjacent intelligent body sends, the time is relatively long, has affected to a certain extent promptness, the accuracy of localization of fault simultaneously.
Summary of the invention
The present invention seeks to the problem of the erroneous judgement, promptness and the accuracy that exist for above-mentioned distributed intelligence localization of fault, and consider the impact of different powering modes, a kind of short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence has been proposed, the method that the method utilizes early warning information or increase verification condition to carry out localization of fault can improve promptness, the accuracy of localization of fault, and can reduce erroneous judgement probability.
The object of the invention is to adopt following technical proposals to realize:
A short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence, its improvements are, described method is utilized early warning information or is increased verification condition and carries out localization of fault; Described method comprises the steps:
(1) in described power distribution network, intelligent body is set;
(2) set up the multi-level many verifications short trouble locating rule of medelling storehouse;
(3) described intelligent body, to this vagabond current in described power distribution network operational process and voltage power distribution network operation information Real-Time Monitoring, if this vagabond current is out-of-limit, enters step (4); Otherwise, continue to loop this step;
(4) described intelligent body sends the out-of-limit signal of electric current to direct neighbor intelligent body and higher level's intelligent body;
(5) check whether this locality has short trouble early warning signal, if had, determine this locality fault that is short-circuited; If no, carry out step (6);
(6) wait for and receive the out-of-limit signal of electric current that described direct neighbor intelligent body sends, after delay time t, enter step (7);
(7) carry out rule match and multiple condition calibration, diagnostic reasoning; Described rule condition coupling comprises: utilize described short trouble locating rule storehouse, in conjunction with described power distribution network wiring type and described intelligent body present position with according to the out-of-limit signal of electric current local and that receive;
(8) determine diagnostic result.
The preferred technical scheme of one provided by the invention is: described in described step (1), in power distribution network, the setting position of intelligent body comprises:
On A, circuit, locate at a certain distance, the liaison office of different circuit;
B, circuit branch;
C, distribution substation/distribute-electricity transformer district;
D, ring main unit/switching station/cable distribution box;
E, distributed power source site;
F, user access point;
The function that described intelligent body possesses comprises that program operation, data storage, electric parameters detect and information communication.
The provided by the invention second preferred technical scheme is: described in described step (2), set up the multi-level many verifications short trouble locating rule of medelling storehouse and comprise the method for operation for power distribution network, set up described short trouble locating rule storehouse;
The described power distribution network method of operation comprises the open loop method of operation and operation with closed ring mode; The described open loop method of operation is the radial power system operating mode of single supply; Described operation with closed ring mode is the method for operation of N power supply while to a mains supply;
In the power distribution network with the described open loop method of operation, end points is the residing position of intelligent body in described power distribution network; Circuit is divided into section by described end points; The link position of described end points in section and section; Described section is the base unit that forms circuit; According to the end points number of described section, be divided into single-ended section, both-end section, three end section and four end section by described with the section in open loop method of operation power distribution network.
The provided by the invention the 3rd preferred technical scheme is: the described mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of the open loop method of operation; The mode of rule of described section level comprises single-ended range mode, both-end range mode, three end section patterns and four end section patterns; Wherein, the rule condition of section level comprises pacing items and verification condition; The rule condition of end points level and circuit hierarchy comprises pacing items.
The provided by the invention the 4th preferred technical scheme is: in the power distribution network in operation with closed ring mode, end points is the residing position of intelligent body in described power distribution network; Circuit is divided into section by described end points; The link position of described end points in section and section; Described section is the base unit that forms circuit; According to end points number and the present position of described section, be divided into four end section on three end section on three end section on both-end section on both-end section, the branch line on single-ended section, backbone, full backbone, three end section, the branch line on half backbone, four end section on full backbone, four end section, two backbones on three backbones and four end section on branch line by described with the section in the power distribution network of operation with closed ring mode.
The provided by the invention the 5th preferred technical scheme is: the described mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of operation with closed ring mode; The mode of rule of described section level comprises four end section patterns on three end section patterns on three end section patterns on both-end range mode on both-end range mode, the branch line on single-ended range mode, backbone, full backbone, three end section patterns, the branch line on half backbone, four end section patterns on full backbone, four end section patterns, two backbones on three backbones and four end section patterns on branch line; Wherein, the rule condition of section level comprises pacing items and verification condition or comprises pacing items; The rule condition of end points level and circuit hierarchy comprises pacing items.
The provided by the invention the 6th preferred technical scheme is: in described step (4), described direct neighbor intelligent body refers to that two intelligent place end points are connected by wire, and is separated by without other intelligent body between two intelligent bodies.
The provided by the invention the 7th preferred technical scheme is: in described step (7), described diagnostic reasoning is followed following requirement:
1. for only there being pacing items without the rule of calibration condition, as long as actual conditions meet all pacing itemss, can determine that conclusion sets up;
2. have again the rule of calibration condition for existing pacing items, if actual conditions meet all pacing itemss and meet at least one calibration condition, conclusion is set up;
3. for described rule, if actual conditions do not meet pacing items, can determine that conclusion is false;
4. have again the rule of calibration condition for existing pacing items, if actual conditions meet whole pacing itemss, and all calibration conditions all do not meet, and conclusion may be set up.
The provided by the invention the 8th preferred technical scheme is: in described step (8), described diagnostic result comprises:
Whether each section that a, described intelligent body connect there is two-phase or three phase short circuit fault;
Each section possibility generation two-phase or three phase short circuit fault that b, described intelligent body connect;
Whether c, described intelligent body are two-phase or three phase short circuit fault point;
D, described two-phase or three phase short circuit fault point are positioned at upstream or the end points place, downstream of fault section;
Whether subordinate's electrical network of e, described intelligent body place section there is two-phase or three phase short circuit fault;
Whether f, described intelligent body feeder line of living in are two-phase or three phase short circuit fault feeder line.
Compared with prior art, the beneficial effect that the present invention reaches is:
1, the short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence provided by the invention, utilizes fault pre-alarming information, realizes determining fast of fault;
2, method provided by the invention is based on distributed intelligence body, and local information is local to be processed, and diagnosis speed is fast;
3, the present invention utilizes the Rulemaking method of medelling, and processing problem is comprehensively reliable;
4, method provided by the invention has realized the localization of fault of section level, dwindles power failure range, diagnoses more accurate;
5, method provided by the invention adopts the Rulemaking mode of multiple calibration, has avoided switch malfunction;
6, method provided by the invention, except the diagnosis of this locality, can be carried out the accident of subordinate's electrical network and judge, is easy to realize multi-stage protection, is desirable short trouble localization method.
Brief description of the drawings
Fig. 1 is the short circuit fault of power distribution network localization method process flow diagram based on the many calibrations of distributed intelligence provided by the invention;
Fig. 2 is the short trouble localization method example structure schematic diagram of the present invention for typical power distribution network.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present invention is for the treatment of the short trouble in power distribution network.Multiple intelligent bodies are set in power distribution network, and each intelligent body possesses the functions such as program operation, data storage, electric parameters detection, information communication.For the multiple method of operation of power distribution network, based on section, end points and circuit types of objects, set up the multi-level many verifications short trouble of medelling locating rule.In power distribution network operational process, each distributed intelligence body, the operation of power networks information such as this vagabond current of Real-Time Monitoring, voltage, once electric current, voltage etc. are out-of-limit, send electric current and voltage out-of-limit signal to direct neighbor intelligent body and higher level's intelligent body, and check whether this locality has short trouble early warning signal, if had, can determine this locality fault that is short-circuited.If without short trouble early warning signal, wait for and receive the out-of-limit signal such as electric current, voltage that direct neighbor intelligent body sends, delay time t (scope of t is 5-50ms).Afterwards, utilize local short trouble locating rule storehouse, in conjunction with power distribution network wiring type and this intelligent body present position, according to the out-of-limit signal such as electric current, voltage local and that receive, carry out regular Condition Matching and multiple condition calibration, determine fault diagnosis result.Diagnostic result comprises, whether each section that this intelligent body connects there is two-phase or three phase short circuit fault, this intelligent body is positioned at upstream or the downstream position of short trouble section, and whether subordinate's electrical network of this intelligent body place section two-phase or three phase short circuit fault etc. occur.
Fig. 1 is the short circuit fault of power distribution network localization method process flow diagram of the many calibrations based on distributed intelligence provided by the invention; As shown in Figure 1, the present invention is achieved by the following technical solutions, comprises the steps:
(1) multiple intelligent bodies are set in power distribution network, each intelligent body possesses the function of program operation, data storage, electric parameters detection and information communication.
In power distribution network, the setting position of intelligent body includes but not limited to following place:
On A, circuit, locate at a certain distance, the liaison office of different circuit;
B, circuit branch;
C, distribution substation/distribute-electricity transformer district;
D, ring main unit/switching station/cable distribution box;
E, distributed power source site;
F, user access point.
(2) set up the multi-level many verifications short trouble of medelling locating rule;
This rule base comprises following content:
The power distribution network method of operation can be divided into two kinds, and one is the open loop method of operation, i.e. the radial power system operating mode of single supply; One is operation with closed ring mode, and N (N >=2) the power supply while is to the method for operation of a mains supply; Need to, for the different power distribution network methods of operation, set up different short trouble locating rules.
One class: for the power distribution network with open loop approach operation
End points is the residing position of intelligent body in electrical network.Circuit is divided into some sections by end points, itself link position in section and section.
Section is the base unit that forms circuit.According to end points number, can be by the section in power distribution network, be divided into four kinds of typical modules such as single-ended section, both-end section, three end section, four end section.N (N >=3) end section, is made up of N bar branch line, the branch line in the corresponding section of each end points.Circuit is connected to form by section and section.
Short circuit fault of power distribution network locating rule with the operation of the open loop method of operation includes but not limited to following mode of rule:
1) section level
A) single-ended range mode
Rule one:
Pacing items: this section end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit;
Verification condition: upstream terminal A, the B phase current of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section end points three-phase current is got over the upper limit;
Verification condition: the upstream end points three-phase current of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
B) both-end range mode
Rule one:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current is got over the upper limit, the upper limit more of third phase (being made as C phase) electric current, and downstream end points is not circulated a notice of three-phase current and is got over the upper limit;
Verification condition one: upstream end points or downstream terminal A, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section upstream end points three-phase current is got over the upper limit, downstream end points three-phase current is not got over the upper limit;
Verification condition one: upstream and downstream two-end-point three-phase voltage between phases is all close to 0;
Verification condition two: the upstream end points three-phase current of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
C) three end section patterns
Rule one:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit, and the three-phase current of two downstream end points is not all got over the upper limit;
The A of one: three end points of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section upstream end points three-phase current is got over the upper limit, and the three-phase current of two downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: three end points of verification condition is close to 0;
Verification condition two: the upstream end points three-phase current of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit, and the downstream end points three-phase current on this section backbone is not all got over the upper limit, and downstream terminal A, B phase current on this section branch line are got over the upper limit, and C phase current is not out-of-limit.
Conclusion: this section fault that is not short-circuited, and on the branch line that this section is drawn, there is A, B two-phase short-circuit fault.
Rule four:
Pacing items: this section upstream end points three-phase current is got over the upper limit, and all upper limits more of downstream end points three-phase current on this section backbone, and downstream end points three-phase current on this section branch line is got over the upper limit.
Conclusion: this section fault that is not short-circuited, and there is three phase short circuit fault on the branch line that this section is drawn.
D) four end section patterns
Rule one:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit, and the three-phase current of three downstream end points is not all got over the upper limit;
The A of one: four end points of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section upstream end points three-phase current is got over the upper limit, and the three-phase current of three downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: four end points of verification condition is close to 0;
Verification condition two: the upstream end points three-phase current of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit, and the downstream end points three-phase current on this section backbone and on a branch line (being designated as branch line 1) is not all got over the upper limit, and downstream terminal A, B phase current on another branch line of this section (being designated as branch line 2) are got over the upper limit, and C phase current is not out-of-limit.
Conclusion: this section fault that is not short-circuited, and on the branch line 2 that this section is drawn, there is A, B two-phase short-circuit fault.
Rule four:
Pacing items: this section upstream end points three-phase current is got over the upper limit, and all upper limits more of the downstream end points three-phase current on this section backbone and on a branch line (being designated as branch line 1), and downstream end points three-phase current on another branch line of this section (being designated as branch line 2) is got over the upper limit.
Conclusion: this section fault that is not short-circuited, and there is three phase short circuit fault on the branch line 2 that this section is drawn.
2) end points level
Rule one:
Pacing items: this end points connects arbitrary section generation two-phase or three phase short circuit fault.
Conclusion: this end points is two-phase or three phase short circuit fault point.
Rule two:
Pacing items: this end points is the upstream end points of two-phase or three phase short circuit fault section.
Conclusion: this end points is two-phase or three phase short circuit fault upstream end points.
Rule three:
Pacing items: this end points is the downstream end points of two-phase or three phase short circuit fault section.
Conclusion: this end points is two-phase or three phase short circuit fault downstream end points.
3) circuit hierarchy
Rule one:
Pacing items: this circuit end points of taking up an official post is two-phase or three phase short circuit fault point.
Conclusion: this circuit is two-phase or three phase short circuit fault circuit.
As shown in Figure 2, Fig. 2 is the short trouble localization method example structure schematic diagram of the present invention for typical power distribution network, the power distribution network moving for operation with closed ring mode shown in figure.
Two classes: for the power distribution network with closed-loop fashion operation
End points is the residing position of intelligent body in electrical network.Circuit is divided into some sections by end points, itself link position in section and section.
Section is the base unit that forms circuit.According to end points number and the present position of section, can be by the section in the power distribution network of operation with closed ring mode, be divided into four end section on three end section on three end section on both-end section on both-end section, the branch line on single-ended section, backbone, full backbone, three end section, the branch line on half backbone, four end section on full backbone, four end section, two backbones on three backbones and the ten kinds of typical modules of four end section on branch line.N (N >=3) end section, is made up of N bar branch line, the branch line in the corresponding section of each end points.Circuit is connected to form by section and section.
Operation with closed ring short circuit fault of power distribution network locating rule includes but not limited to following mode of rule:
1) section level:
A) single-ended range mode
Rule one:
Pacing items: this section end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit;
Verification condition one: terminal A, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section end points three-phase current is got over the upper limit;
Verification condition one: end points three-phase voltage between phases is close to 0;
Verification condition two: the upstream end points three-phase current of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
B) the both-end section on backbone
Rule one:
Pacing items one: this section two-end-point two-phase (being made as A, B phase) direction of current, is and flows into this section direction;
Pacing items two: one end points (being made as end points 1) A, B phase current forwards are got over the upper limit, and C phase current is not got over the upper limit; And another end points (being made as end points 2) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit;
Verification condition one: two-end-point A, B voltage between phases are close to 0, and all the other voltages between phases are normal.
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items one: this section two-end-point three-phase current direction, is and flows into this section direction;
Two: one end points (being made as end points 1) three electric current forwards of pacing items are got over the upper limit; And another end points (being made as end points 2) three-phase current negative sense is got over the upper limit;
Verification condition one: two-end-point three-phase voltage between phases is close to 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
C) the both-end section on branch line
Rule one:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current forward is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit; And downstream end points three-phase current is not all got over the upper limit;
Verification condition one: two-end-point A, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current forward of this section upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section upstream end points three-phase current forward is got over the upper limit; And downstream end points three-phase current is not all got over the upper limit;
Verification condition one: two-end-point three-phase voltage between phases is close to 0;
Verification condition two: the upstream end points three-phase current forward of this section upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
D) three end section on full backbone
Rule one:
Pacing items one: this section three end points two-phases (being made as A, B phase) direction of current, is and flows into this section direction;
Pacing items two: one end points (being made as end points 1) A, B phase current forwards are got over the upper limit, and C phase current is not got over the upper limit; And another two end points (being made as end points 2,3) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit;
One: three terminal A of verification condition, B phase voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And the adjacent end points in end points 2 and end points 3 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items one: this section three end points three-phase current directions, are and flow into this section direction;
Two: one end points (being made as end points 1) three-phase current forwards of pacing items are got over the upper limit; And another two end points (being made as end points 2,3) three-phase current negative sense is got over the upper limit;
One: three end points three-phase voltage between phases of verification condition is close to 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 and end points 3 non-this section on backbone, three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
E) three end section on half backbone
Rule one:
Pacing items one: two end points two-phases (being made as A, the B phase) direction of current on this section backbone, is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 3) three-phase current is not all got over the upper limit.
One: three terminal A of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items one: two end points three-phase current directions on this section backbone, are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And branch line upper extreme point (being made as end points 3) three-phase current is not all got over the upper limit;
One: three end points three-phase voltage between phases of verification condition is close to 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items one: two end points two-phases (being made as A, the B phase) direction of current on this section backbone, is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 3) A, B phase current forward are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: this section fault that is not short-circuited, and on the branch line that this section is drawn, there is A, B two-phase short-circuit fault.
Rule four:
Pacing items one: two end points three-phase current directions on this section backbone, are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And branch line upper extreme point (being made as end points 3) three-phase current forward is got over the upper limit.
Conclusion: this section fault that is not short-circuited, and there is three phase short circuit fault on the branch line that this section is drawn.
F) three end section on branch line
Rule one:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit, and the three-phase current of two downstream end points is not all got over the upper limit;
The A of one: three end points of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section upstream end points three-phase current is got over the upper limit, and the three-phase current of two downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: three end points of verification condition is close to 0;
Verification condition two: the upstream end points three-phase current of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
G) four end section on full backbone
Rule one:
Pacing items one: this section four end points two-phases (being made as A, B phase) direction of current, is and flows into this section direction;
Pacing items two: one end points (being made as end points 1) A, B phase current forwards are got over the upper limit, and C phase current is not got over the upper limit; And another three end points (being made as end points 2,3,4) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit;
One: four terminal A of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And the adjacent end points in end points 2, end points 3 and end points 4 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items one: this section four end points three-phase current directions, are and flow into this section direction;
Two: one end points (being made as end points 1) three-phase current forwards of pacing items are got over the upper limit; And another three end points (being made as end points 2,3,4) three-phase current negative sense is got over the upper limit;
One: four end points three-phase voltage between phases of verification condition is close to 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, three-phase current forward is got over the upper limit; And the adjacent end points in end points 2, end points 3 and end points 4 non-this section on backbone, three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
H) four end section on three backbones
Rule one:
Pacing items one: three end points two-phases (being made as A, the B phase) direction of current on this section backbone, is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And another two backbone upper extreme points (being made as end points 2,3) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 4) three-phase current is not all got over the upper limit;
One: four terminal A of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And the adjacent end points in end points 2,3 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items one: three end points three-phase current directions on this section backbone, are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another two backbone upper extreme points (being made as end points 2,3) three-phase current negative sense is got over the upper limit; And branch line upper extreme point (being made as end points 4) three-phase current is not all got over the upper limit;
One: four end points three-phase voltage between phases of verification condition is all close to 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, three-phase current forward is got over the upper limit; And the adjacent end points in end points 2,3 non-this section on backbone, three-phase current negative sense is got over the upper limit;
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items one: three end points two-phases (being made as A, the B phase) direction of current on this section backbone, is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And another two backbone upper extreme points (being made as end points 2,3) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit; And branch line upper extreme point (being made as end points 4) A, B circuitry phase forward are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: this section fault that is not short-circuited, and on the branch line that this section is drawn, there is A, B two-phase short-circuit fault.
Rule four:
Pacing items one: three end points three-phase current directions on this section backbone, are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another two backbone upper extreme points (being made as end points 2,3) three-phase current negative sense is got over the upper limit; And branch line upper extreme point (being made as end points 4) three-phase current forward is got over the upper limit.
Conclusion: this section fault that is not short-circuited, and there is three phase short circuit fault on the branch line that this section is drawn.
I) four end section on two backbones
Rule one:
Pacing items one: two end points two-phases (being made as A, the B phase) direction of current on this section backbone, is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit; And two branch line upper extreme points (being made as end points 3,4) three-phase current is not all got over the upper limit;
One: four terminal A of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, A, B phase current negative sense are got over the upper limit, and C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items one: two end points three-phase current directions on this section backbone, are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And two branch line upper extreme points (being made as end points 3,4) three-phase current is not all got over the upper limit;
One: four end points three-phase voltage between phases of verification condition is all close to 0;
Verification condition two: the adjacent end points in end points 1 non-this section on backbone, three-phase current forward is got over the upper limit; And the adjacent end points in end points 2 non-this section on backbone, three-phase current negative sense is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
Rule three:
Pacing items one: two end points two-phases (being made as A, the B phase) direction of current on this section backbone, is and flows into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) A, B phase current forward are got over the upper limit, and C phase current is not got over the upper limit; And another backbone upper extreme point (being made as end points 2) A, B phase current negative sense are got over the upper limit, C phase current is not got over the upper limit; And a branch line upper extreme point (being made as end points 3) A, B circuitry phase forward are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: this section fault that is not short-circuited, and there is A, B two-phase short-circuit fault on the branch line at end points 3 places that this section is drawn.
Rule four:
Pacing items one: two end points three-phase current directions on this section backbone, are and flow into this section direction;
Two: one backbone upper extreme points of pacing items (being made as end points 1) three-phase current forward is got over the upper limit; And another backbone upper extreme point (being made as end points 2) three-phase current negative sense is got over the upper limit; And a branch line upper extreme point (being made as end points 3) three-phase current forward is got over the upper limit.
Conclusion: this section fault that is not short-circuited, and there is three phase short circuit fault on the branch line at end points 3 places that this section is drawn.
J) four end section on branch line
Rule one:
Pacing items: this section upstream end points two-phase (being made as A, B phase) electric current forward is got over the upper limit, third phase (being made as C phase) electric current is not got over the upper limit, and the three-phase current of three downstream end points is not all got over the upper limit;
The A of one: four end points of verification condition, B voltage between phases are close to 0, and all the other voltages between phases are normal;
Verification condition two: upstream terminal A, the B phase current forward of upstream adjacent sections are got over the upper limit, C phase current is not got over the upper limit.
Conclusion: A, B two-phase short-circuit fault occur this section.
Rule two:
Pacing items: this section upstream end points three-phase current forward is got over the upper limit, and the three-phase current of three downstream end points is not all got over the upper limit;
The three-phase voltage between phases of one: four end points of verification condition is close to 0;
Verification condition two: the upstream end points three-phase current forward of upstream adjacent sections is got over the upper limit.
Conclusion: this section generation three phase short circuit fault.
2) end points level:
Rule one:
Pacing items: this end points connects arbitrary section generation two-phase or three phase short circuit fault.
Conclusion: this end points is two-phase or three phase short circuit fault point.
Rule two:
Pacing items: this end points is the upstream end points of two-phase or three phase short circuit fault section.
Conclusion: this end points is two-phase or three phase short circuit fault upstream end points.
Rule three:
Pacing items: this end points is the downstream end points of two-phase or three phase short circuit fault section.
Conclusion: this end points is two-phase or three phase short circuit fault downstream end points.
3) circuit hierarchy:
Rule one:
Pacing items: this circuit end points of taking up an official post is two-phase or three phase short circuit fault point.
Conclusion: this circuit is two-phase or three phase short circuit fault circuit.
Described power distribution network positive dirction, in the power distribution network of open loop operation, refers to the direction of tide that power supply provides.In the power distribution network of operation with closed ring, refer to the direction of tide that the power supply of a certain appointment provides.
Described backbone, in the power distribution network of open loop operation, refers to the circuit of bearing main trend allocating task; In the power distribution network of operation with closed ring, refer to the circuit with both end power supplying power supply.
Described branch line, in the power distribution network of open loop operation, refers to the trend receiving from backbone, and trend is supplied with to the circuit of each load; In the power distribution network of operation with closed ring, refer to the circuit that only has single-ended trend to feed.
The described end points electric current forward upper limit, refers to when electrical network normally moves, and flows through the forward current maximum amplitude of this end points.
The described end points electric current negative sense upper limit, refers to when electrical network normally moves, and flows through the negative current maximum amplitude of this end points.
Described section upstream end points refers to, forward trend flows into the end points of this section institute warp.
Described section downstream end points refers to, forward trend flows out the end points of this section institute warp.
Two described adjacent referring to of section, these two sections are connected by a common end points.
The upstream zone of certain described section refers to, forward trend flow into before this section the section of process.
Described single-ended section refers to only there is the section of an end points.Such section has more present electrical network end.
Described both-end section refers to the section of two end points.
Three described end section refer to the section of three end points.
Three end section on described full backbone refer to, three branch lines in this three end section are all on electrical network backbone.
Three end section on half described backbone refer to, this three end section has two branch lines on electrical network backbone, and a branch line is on electrical network branch line.
Four described end section refer to the section of four end points.
Four end section on described full backbone refer to, four branch lines in this four end section are all on electrical network backbone.
Four end section on three described backbones refer to, this four end section has three branch lines on electrical network backbone, and a branch line is on electrical network branch line.
Four end section on two described backbones refer to, this four end section has two branch lines on electrical network backbone, and two branch lines are on electrical network branch line.
(3), in power distribution network operational process, each intelligent body this vagabond current of Real-Time Monitoring and voltage operation of power networks information, if this vagabond current is out-of-limit, enter step (4); Otherwise, continue to loop this step;
(4) each intelligent body sends the out-of-limit signal of electric current to direct neighbor intelligent body and higher level's intelligent body;
Two described intelligent body direct neighbors refer to, two intelligent body place end points are connected by wire, and are separated by without other intelligent body between two intelligent bodies.
(5) check whether this locality has short trouble early warning signal, if had, determine this locality fault that is short-circuited; If no, carry out step (6).
(6) wait for and receive the out-of-limit signal of electric current that direct neighbor intelligent body sends, delay time t, enters step (7);
(7) utilize local short trouble locating rule storehouse, in conjunction with power distribution network wiring type and this intelligent body present position, according to the out-of-limit signal of electric current local and that receive, carry out rule match and multiple condition calibration, diagnostic reasoning;
Reasoning process is followed following requirement:
1. for the rule that only has pacing items without calibration condition, as long as actual conditions meet all pacing itemss, can determine conclusion establishment.
2. have again the rule of calibration condition for existing pacing items, if actual conditions meet all pacing itemss and meet at least one calibration condition, conclusion is set up.
3. for each rule, if actual conditions do not meet pacing items, can determine that conclusion is false.
4. have again the rule of calibration condition for existing pacing items, if actual conditions meet whole pacing itemss, and all calibration conditions all do not meet, and conclusion may be set up.
(8) determine diagnostic result.
Diagnostic result includes but not limited to following content:
Whether each section that a, this intelligent body connect there is two-phase or three phase short circuit fault.
Each section possibility generation two-phase or three phase short circuit fault that b, this intelligent body connect.
Whether c, this intelligent body are two-phase or three phase short circuit fault point (fault upstream end points or downstream end points).
Whether subordinate's electrical network of d, this intelligent body place section there is two-phase or three phase short circuit fault.
Whether e, this intelligent body feeder line of living in are two-phase or three phase short circuit fault feeder line.
The short circuit fault of power distribution network localization method of a kind of multiple calibration based on distributed intelligence provided by the invention utilizes fault pre-alarming information, realizes determining fast of fault; Based on distributed intelligence body, local information is local to be processed, and diagnosis speed is fast; The Rulemaking method of utilizing medelling, processing problem is comprehensively reliable; Realize the localization of fault of section level, dwindled power failure range, diagnosed more accurate; Adopt the Rulemaking mode of multiple calibration, avoided switch malfunction.Meanwhile, except the diagnosis of this locality, can carry out the accident of subordinate's electrical network and judge, be easy to realize multi-stage protection, be desirable short trouble localization method.
Finally should be noted that: above embodiment is only in order to illustrate the application's technical scheme but not restriction to its protection domain; although the application is had been described in detail with reference to above-described embodiment; those of ordinary skill in the field are to be understood that: those skilled in the art still can carry out all changes, revise or be equal to replacement to the embodiment of application after reading the application; these change, revise or be equal to replacement, within the claim scope that it all awaits the reply in its application.
Claims (8)
1. the short circuit fault of power distribution network localization method based on the multiple calibration of distributed intelligence, is characterized in that, described method is utilized early warning information and increased verification condition and carries out localization of fault; Described method comprises the steps:
(1) in described power distribution network, intelligent body is set;
(2) set up the multi-level many verifications short trouble locating rule of medelling storehouse;
(3) described intelligent body, to this vagabond current in described power distribution network operational process and voltage power distribution network operation information Real-Time Monitoring, if this vagabond current is out-of-limit, enters step (4); Otherwise, continue to loop this step;
(4) described intelligent body sends the out-of-limit signal of electric current to direct neighbor intelligent body and higher level's intelligent body;
(5) check whether this locality has short trouble early warning signal, if had, determine this locality fault that is short-circuited; If no, carry out step (6);
(6) wait for and receive the out-of-limit signal of electric current that described direct neighbor intelligent body sends, after delay time t, enter step (7), the scope of t is 5-50ms;
(7) carry out rule match and multiple condition calibration, diagnostic reasoning; Described rule condition coupling comprises: utilize described short trouble locating rule storehouse, in conjunction with described power distribution network wiring type and described intelligent body present position with according to the out-of-limit signal of electric current local and that receive;
(8) determine diagnostic result;
Described in described step (2), set up the multi-level many verifications short trouble locating rule of medelling storehouse and comprise the method for operation for power distribution network, set up described short trouble locating rule storehouse;
The described power distribution network method of operation comprises the open loop method of operation and operation with closed ring mode; The described open loop method of operation is the radial power system operating mode of single supply; Described operation with closed ring mode is the method for operation that N power supply is powered to a power distribution network simultaneously, N >=2;
In the power distribution network with described open loop method of operation operation, end points is the residing position of intelligent body in described power distribution network; Circuit is divided into section by described end points; The link position of described end points in section and section; Described section is the base unit that forms circuit; According to the end points number of described section, the section in the power distribution network with described open loop method of operation operation is divided into single-ended section, both-end section, three end section and four end section.
2. short circuit fault of power distribution network localization method as claimed in claim 1, is characterized in that, described in described step (1), in power distribution network, the setting position of intelligent body comprises:
On A, circuit, locate at a certain distance, the liaison office of different circuit;
B, circuit branch;
C, distribution substation/distribute-electricity transformer district;
D, ring main unit/switching station/cable distribution box;
E, distributed power source site;
F, user access point;
The function that described intelligent body possesses comprises that program operation, data storage, electric parameters detect and information communication.
3. short circuit fault of power distribution network localization method as claimed in claim 1, is characterized in that, the described mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of the open loop method of operation; The mode of rule of described section level comprises single-ended range mode, both-end range mode, three end section patterns and four end section patterns; Wherein, the rule condition of section level comprises pacing items and verification condition; The rule condition of end points level and circuit hierarchy comprises pacing items.
4. short circuit fault of power distribution network localization method as claimed in claim 1, is characterized in that, in the power distribution network in operation with closed ring mode, end points is the residing position of intelligent body in described power distribution network; Circuit is divided into section by described end points; The link position of described end points in section and section; Described section is the base unit that forms circuit; According to end points number and the present position of described section, be divided into four end section on three end section on three end section on both-end section on both-end section, the branch line on single-ended section, backbone, full backbone, three end section, the branch line on half backbone, four end section on full backbone, four end section, two backbones on three backbones and four end section on branch line by described with the section in the power distribution network of operation with closed ring mode.
5. short circuit fault of power distribution network localization method as claimed in claim 4, is characterized in that, the described mode of rule that comprises section level, end points level and circuit hierarchy with the short circuit fault of power distribution network locating rule pattern of operation with closed ring mode; The mode of rule of described section level comprises four end section patterns on three end section patterns on three end section patterns on both-end range mode on both-end range mode, the branch line on single-ended range mode, backbone, full backbone, three end section patterns, the branch line on half backbone, four end section patterns on full backbone, four end section patterns, two backbones on three backbones and four end section patterns on branch line; Wherein, the rule condition of section level comprises pacing items and verification condition or comprises pacing items; The rule condition of end points level and circuit hierarchy comprises pacing items.
6. short circuit fault of power distribution network localization method as claimed in claim 1, is characterized in that, in described step (4), described direct neighbor intelligent body refers to that two intelligent place end points are connected by wire, and is separated by without other intelligent body between two intelligent bodies.
7. short circuit fault of power distribution network localization method as claimed in claim 1, is characterized in that, in described step (7), described diagnostic reasoning is followed following requirement:
1. for only there being pacing items without the rule of calibration condition, as long as actual conditions meet all pacing itemss, can determine that conclusion sets up;
2. have again the rule of calibration condition for existing pacing items, if actual conditions meet all pacing itemss and meet at least one calibration condition, conclusion is set up;
3. for described rule, if actual conditions do not meet pacing items, can determine that conclusion is false;
4. have again the rule of calibration condition for existing pacing items, if actual conditions meet whole pacing itemss, and all calibration conditions all do not meet, and conclusion may be set up.
8. short circuit fault of power distribution network localization method as claimed in claim 1, is characterized in that, in described step (8), described diagnostic result comprises:
Whether each section that a, described intelligent body connect there is two-phase or three phase short circuit fault;
Each section possibility generation two-phase or three phase short circuit fault that b, described intelligent body connect;
Whether c, described intelligent body are two-phase or three phase short circuit fault point;
D, described two-phase or three phase short circuit fault point are positioned at upstream or the end points place, downstream of fault section;
Whether subordinate's electrical network of e, described intelligent body place section there is two-phase or three phase short circuit fault;
Whether f, described intelligent body feeder line of living in are two-phase or three phase short circuit fault feeder line.
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