CN108761275A - A kind of Fault Locating Method of AC power distribution line - Google Patents
A kind of Fault Locating Method of AC power distribution line Download PDFInfo
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- CN108761275A CN108761275A CN201810542959.6A CN201810542959A CN108761275A CN 108761275 A CN108761275 A CN 108761275A CN 201810542959 A CN201810542959 A CN 201810542959A CN 108761275 A CN108761275 A CN 108761275A
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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
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/088—Aspects of digital computing
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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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention belongs to the fault diagnosis fields of AC distribution net, more particularly, to a kind of Fault Locating Method of AC power distribution line.By judging area fault and introducing load and region load of the vertex to arc, easy minimum distribution region disconnecting algorithm is provided, and the search step of superheat region has been discussed in detail；Situation few, incomplete to feeder line detection and control terminal fault message simultaneously gives Corresponding Countermeasures.Sample calculation analysis shows that new method reasoning is simple, zmodem, and can accurately weigh the degree of failure, has higher practical value.
Description
Technical field
The invention belongs to the fault diagnosis fields of AC distribution net, more particularly, to a kind of event of AC power distribution line
Hinder localization method.
Background technology
With China's economy, the prosperity and development of society, the continuous improvement of people's level of consumption, level, industry, occupies business
Work of the civilian family to electric power enterprise in terms of the power distribution networks such as power supply quality, power supply reliability and fault location, isolation, repairing
More stringent requirements are proposed, it is therefore desirable to establish perfect distribution automation system, can identify and be isolated system in a short time
System short trouble farthest avoids long-time, large-area power-cuts caused by failure.
Usual distribution network closed-loop design, open loop operation.Reliability is improved using closed loop configuration, open loop operation is fixed convenient for failure
Position and relay protection setting, each feeder line are connected by interconnection switch, it is whole radially, reticular structure.With flying for social economy
Speed development, the index that city, rural area renovate cable rate as power distribution network promote town and country power distribution network gradually to increase
Add the laying of cable run, this also results in the situation of overhead transmission line and cable run series-parallel connection transmission of electricity.Cable run impedance is more than
Overhead transmission line, and shunt conductance, susceptance can generally be ignored.And many Fault Locating Methods can't be applicable in completely at present
In series-parallel connection line mode, and power distribution network branch is more, and number of devices is numerous, and loop networks switch, automatic circuit and sectionaliser etc. are along feedback
Line be distributed, oneself through be no longer " two points one lines " in high-pressure system simple structure, equipment operating environment is more severe, fault location
Problem complexity is very big.
Therefore, the fault-location problem of power distribution network is not solved effectively to a certain extent.If one can be found
The suitable technical method of kind can accurately make abort situation rapidly after failure generation, on the one hand save manpower and materials,
On the other hand the working efficiency of distribution can be improved, failure is effectively isolated within first time and is repaired in realization, to reduce
Power supply interrupted district and restore normal supply of electric power rapidly, improve system stability, reduces the harm that failure is brought.Therefore, to matching
The research of net fault location is of great significance, and there is an urgent need to study and improve the fault location scheme suitable for power distribution network.
Invention content
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of fault location sides of AC power distribution line
Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of fault location of AC power distribution line
Method includes the following steps：
The switch of power distribution network and tie point are regarded as vertex by step 1, and feeder line section regards arc as, and the direction of arc is on circuit
Power distribution network is mapped as a digraph by the direction of trend；
Step 2, the load for defining vertex are the load for flowing through switch, and the load of arc is the load that feeder line section is confessed, and is obtained
The corresponding variable structure dissipated network of the power distribution network；According to the property of dissipative network, by the load of the carry calculation arc on vertex, and look for
Go out superheat region, i.e. fault zone；
Step 3 provides Corresponding Countermeasures for few, the incomplete situation of feeder line detection and control terminal fault message.
Preferably, in step 1, if the power distribution network only by a power supply power supply when, to the whole network power power outflow side
To the positive direction of as feeder line；If the power distribution network is by multiple power supply power supplies, it is reference to choose one of power supply, selected
Power flow outgoing direction when power supply is individually powered is the positive direction of feeder line；After failure occurs, when Feeder Terminal Unit FTU acquisitions
When load is identical as network positive direction, then positive load value is reported, when the load and network of Feeder Terminal Unit FTU acquisitions are square
To it is opposite when, then report negative load value.
Preferably, in step 2, it is by the specific formula of the load of the carry calculation arc on vertex：
lij=lii-ljj
Lii, ljj are respectively the load for flowing through vertex i, j in formula, and lij is the load for flowing through arc ij；And to arbitrary vertex,
There is following relationship on vertex to the load of arc：
In formula：Dm is to assume that positive direction is directed toward the initial point of the arc of vertex i；Kj is to assume that positive direction leaves the arc of vertex i
Last point.
Preferably, on vertex in the load relationship of arc：When the number of degrees of vertex i are 2, the 2 arc (d in i pairs of vertex1, i) and
(i, k1) load it is equal, i.e. li(d1, i) and=li(i, k1)；If all endpoints in a region are switched and without interior
Point or all interior points are all Coupling points, then the region is referred to as minimum distribution region, minimum distribution region be actually failure every
From minimum zone；When distribution region P is minimum distribution region, corresponding region load is respectively
Vertex i is initial point in formula, and vertex k1 ..., kN are the load l (i, kl ..., kN) in the minimum distribution region of end point
The supply load being defined as in the P of region, o points are unknown message point.
Preferably, region load is normalized, then had
In formula：l(i,k1,…,kN) be minimum distribution region P load；R(i,k1,…,kN) be P rated load；If ln
(i,k1,…,kN) being more than 100, then region P is referred to as superheat region, i.e. fault zone.
Preferably, in step 3, the case where considering when Feeder Terminal Unit FTU reports information incomplete, this method is still
It can be properly positioned, the difference only positioned can become larger.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) compared with traditional overheat arc searching method, the minimum distribution region disconnecting process of this paper institutes extracting method is simple,
The memory space of occupancy is small；
(2) multiplicating decision process is avoided to the region of the contact containing branch, a variety of special wirings switch in power distribution network
Conversion can be not added with and directly apply this method；
(3) context of methods be applicable to fault message it is incomplete when more power supplys supplying electricity and power distribution net arranged side by side fault location,
And it can accurately weigh the degree of failure；When multiple failure occurs simultaneously, the failure that priority processing can be selected more serious,
To meet the actual requirement of distribution network failure isolation.
Description of the drawings
A kind of Fault Locating Method flow chart of AC power distribution line of Fig. 1 present invention；
Fig. 2 is the topology diagram of the more power supply supplying electricity and power distribution nets arranged side by side of the present invention；
Fig. 3 is the corresponding dissipative network figure of power distribution network of the present invention；
Fig. 4 is fault location practical operation figure of the present invention；
Fig. 5 is dissipative network figure when information is lost at vertex 2 of the present invention；
Fig. 6 is the final minimum distribution range searching result figure of the present invention.
Specific implementation mode
The present invention is further illustrated With reference to embodiment.Wherein, attached drawing only for illustration,
What is indicated is only schematic diagram rather than pictorial diagram, should not be understood as the limitation to this patent；Reality in order to better illustrate the present invention
Example is applied, the certain components of attached drawing have omission, zoom in or out, and do not represent the size of actual product；To those skilled in the art
For, the omitting of some known structures and their instructions in the attached drawings are understandable.
The same or similar label correspond to the same or similar components in the attached drawing of the embodiment of the present invention；In retouching for the present invention
In stating, it is to be understood that if it is based on attached drawing to have the orientation or positional relationship of the instructions such as term "upper", "lower", "left", "right"
Shown in orientation or positional relationship, be merely for convenience of description of the present invention and simplification of the description, do not indicate or imply the indicated
Device or element must have a particular orientation, with specific azimuth configuration and operation, therefore position relationship described in attached drawing
Term only for illustration, should not be understood as the limitation to this patent, for the ordinary skill in the art, can
To understand the concrete meaning of above-mentioned term as the case may be.
Embodiment
Below in conjunction with the accompanying drawings, it elaborates to the present invention, Fig. 1 is a kind of fault location of AC power distribution line of the present invention
Method flow diagram, the present invention propose a kind of Fault Locating Method of AC power distribution line, include the following steps：
The switch of power distribution network and tie point are regarded as vertex by step 1, and feeder line section regards arc as, and the direction of arc is on circuit
Power distribution network can be mapped as a digraph by the direction of trend；
Step 2, the load for defining vertex are the load for flowing through switch, and the load of arc is the load that feeder line section is confessed, must
To the corresponding variable structure dissipated network of the power distribution network.According to the property of dissipative network, can by the load of the carry calculation arc on vertex,
And find out superheat region (i.e. fault zone)；
Step 3 gives Corresponding Countermeasures for few, the incomplete situation of feeder line detection and control terminal fault message.
Wherein, in step 1, if the power distribution network only by a power supply power supply when, to the whole network power power flow outgoing direction
The as positive direction of feeder line；If the power distribution network is by multiple power supply power supplies, it is reference, selected electricity to choose one of power supply
Power flow outgoing direction when source individually powers is the positive direction of feeder line；After failure occurs, when bearing for Feeder Terminal Unit FTU acquisitions
When lotus is identical as network positive direction, then positive load value is reported, when the load and network positive direction of Feeder Terminal Unit FTU acquisitions
When opposite, then negative load value is reported.
In addition, in step 2, the specific formula by the load of the carry calculation arc on vertex is：
lij=lii-ljj
Lii, ljj are respectively the load for flowing through vertex i, j in formula, and lij is the load for flowing through arc ij；And to arbitrary vertex,
There is following relationship on vertex to the load of arc：
In formula：Dm is to assume that positive direction is directed toward the initial point of the arc of vertex i；Kj is to assume that positive direction leaves the arc of vertex i
Last point.
Wherein, on vertex in the load relationship of arc：When the number of degrees of vertex i are 2, the 2 arc (d in i pairs of vertex1, i) and
(i, k1) load it is equal, i.e. li(d1, i) and=li(i, k1)；If all endpoints in a region are switched and without interior
Point or all interior points are all Coupling points, then the region is referred to as minimum distribution region, minimum distribution region be actually failure every
From minimum zone；When distribution region P is minimum distribution region, corresponding region load is respectively
Vertex i is initial point in formula, and vertex k1 ..., kN are the load l (i, kl ..., kN) in the minimum distribution region of end point
The supply load being defined as in the P of region, o points are unknown message point.
In addition, region load is normalized, then have
In formula：l(i,k1,…,kN) be minimum distribution region P load；R(i,k1,…,kN) be P rated load；If ln
(i,k1,…,kN) being more than 100, then region P is referred to as superheat region, i.e. fault zone.
Wherein, in step 3, the case where considering when Feeder Terminal Unit FTU reports information incomplete, this method still may be used
To be properly positioned, the difference only positioned can become larger.
Fig. 2 is the topology diagram of more power supplys supplying electricity and power distribution net arranged side by side, and the node in figure is breaker, block switch, connection
Network switchs, and interior joint 9 is special key.It is assumed that power flow outgoing direction when using busbar A as feeder ear is network positive direction, then
In the presence of the arc (1,2) put respectively with end for initial point with vertex 1 and 2.After failure occurs, when load and the network of FTU acquisitions are square
To it is identical (anti-) when, then report positive (negative) load value.
Fig. 3 is the corresponding dissipative network figure of power distribution network.Wherein, vertex 1 is 186 to the load of arc (1,2)；Do not have at vertex 3
There is switch, is Coupling point, vertex 3 not can determine that the load of dependence arc；Vertex 9 is special key, to the negative of arc (9,10)
Lotus is l9 (9,10)=103, and the load to arc (9,11) is l9 (9,11)=- 168, by formulaIt can
Know that vertex 9 is l9 (8,9)=l9 (9,11)+l9 (9,10)=(- 168)+103=-65 to the load of arc (8,9).By above-mentioned mistake
Journey is it is found that the concept of apex load cannot characterize the information on load at vertex 9, and vertex more can accurately describe the load of arc
The information on load of FTU acquisitions.
Fig. 4 is fault location practical operation figure, and 3 steps of wherein superheat region identification are attributed to point in practical operation
2 steps are identified from minimum distribution region and superheat region.Successively using each non-coupled point as initial point, breadth-first search is executed,
Until the end searched is switch vertex.Since power distribution network intermediate ring road is few, breadth-first search adaptation of methods
Property is good, and efficiency is higher.As shown in Figure 3, it is assumed that the rated load of each arc is l0.It is first that initial point searches top with vertex 1
Point 2 is finished with vertex 1 for the minimum distribution range searching of initial point since vertex 2 is switch vertex, and region rated load is R
(1,2)=10.Then it is that initial point searches vertex 3 with vertex 2, since vertex 3 is Coupling point, continues search for switch dome
Point 4 and 5, is finished with vertex 2 for the minimum distribution range searching of initial point, and region rated load is R (2,4,5)=10+10+10=
30.Vertex 3 is Coupling point, therefore is not searched for using it as initial point.It is finally that initial point searches vertex 9 with vertex 8, due to vertex 9
To switch vertex, finished for the minimum distribution range searching of initial point with vertex 8, region rated load is R (8,9)=10.Table 1 is
Final minimum distribution range searching result.
In the above search process, region rated load, which has calculated, to be finished.For each minimum distribution region, according to it
Terminal point information calculates corresponding region load, and detailed calculating process is shown in Table 1.Then, by formula
The normalization load for calculating each minimum distribution region, fault zone is classified as by superheat region.By taking Fig. 3 as an example,
Region with vertex 2,4 and 5 for endpoint normalizes load
Due to ln(2,4,5)>100, it is seen that the region is superheat region, can similarly be obtained
Comparison is found, more serious for the zone fault of endpoint with vertex 2,4 and 5, needs priority processing.
Fig. 5 is dissipative network figure when information is lost at vertex 2, and since FTU is in open air, service condition is severe, and pole can
The case where information loss can occur, visible vertex 2 is seen as Coupling point at this time, matches using vertex Isosorbide-5-Nitrae and 5 as minimum for the region of endpoint
Electric region, and region rated load R (Isosorbide-5-Nitrae, 5)=40, region load l (Isosorbide-5-Nitrae, 5)=l1 (1,2)-l4 (3,4)-l5 (3,5)=
186- (- 138) -3=321,Finally it can determine that failure is happened at top
Between point 1,4 and 5.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
All any modification, equivalent and improvement etc., should be included in the claims in the present invention made by within the spirit and principle of invention
Protection domain within.
Claims (5)
1. a kind of Fault Locating Method of AC power distribution line, which is characterized in that the described method comprises the following steps：
The switch of power distribution network and tie point are regarded as vertex by step 1, and feeder line section regards arc as, and the direction of arc is trend on circuit
Direction, power distribution network is mapped as a digraph；
Step 2, the load for defining vertex are the load for flowing through switch, and the load of arc is the load that feeder line section is confessed, and obtains this and matches
The corresponding variable structure dissipated network of power grid；According to the property of dissipative network, by the load of the carry calculation arc on vertex, and found out
Thermal region, i.e. fault zone；
Step 3 provides Corresponding Countermeasures for few, the incomplete situation of feeder line detection and control terminal fault message.
2. according to a kind of Fault Locating Method of AC power distribution line described in claim 1, which is characterized in that in step 1
In, if the power distribution network only by a power supply power supply when, to the whole network power power flow outgoing direction be feeder line positive direction；If should
For power distribution network by multiple power supply power supplies, then it is reference, power flow when selected power supply is individually powered to choose one of power supply
Outgoing direction is the positive direction of feeder line；After failure occurs, when the load of Feeder Terminal Unit FTU acquisitions is identical as network positive direction
When, then positive load value is reported, when the load of Feeder Terminal Unit FTU acquisitions is opposite with network positive direction, is then reported negative
Load value.
3. according to a kind of Fault Locating Method of AC power distribution line described in claim 1, which is characterized in that in step 2
In, the specific formula by the load of the carry calculation arc on vertex is：
lij=lii-ljj
Lii, ljj are respectively the load for flowing through vertex i, j in formula, and lij is the load for flowing through arc ij；And to arbitrary vertex, vertex
There is following relationship to the load of arc：
In formula：Dm is to assume that positive direction is directed toward the initial point of the arc of vertex i；Kj is to assume that positive direction leaves the last point of the arc of vertex i.
4. according to a kind of Fault Locating Method of AC power distribution line described in claim 3, which is characterized in that on vertex pair
In the load relationship of arc：When the number of degrees of vertex i are 2, the 2 arc (d in i pairs of vertex1, i) and (i, k1) load it is equal, i.e. li
(d1, i) and=li(i, k1)；If all endpoints in a region are all to switch and be all coupling without interior point or all interior points
Chalaza, then the region is referred to as minimum distribution region, and minimum distribution region is actually the minimum zone of Fault Isolation；When distribution area
When domain P is minimum distribution region, corresponding region load is respectively
Vertex i is initial point in formula, and vertex k1 ..., kN are load l (i, kl ..., the kN) definition in the minimum distribution region of end point
For the supply load in the P of region, o points are unknown message point.
5. according to a kind of Fault Locating Method of AC power distribution line described in claim 4, which is characterized in that bear region
Lotus is normalized, then has
In formula：l(i,k1,…,kN) be minimum distribution region P load；R(i,k1,…,kN) be P rated load；If ln(i,
k1,…,kN) being more than 100, then region P is referred to as superheat region, i.e. fault zone.
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| CN201810542959.6A CN108761275A (en) | 2018-05-30 | 2018-05-30 | A kind of Fault Locating Method of AC power distribution line |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253314A (en) * | 2011-06-23 | 2011-11-23 | 陕西电力科学研究院 | Superheat region searching method for fault location of electric distribution network |
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2018
- 2018-05-30 CN CN201810542959.6A patent/CN108761275A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253314A (en) * | 2011-06-23 | 2011-11-23 | 陕西电力科学研究院 | Superheat region searching method for fault location of electric distribution network |
Non-Patent Citations (1)
| Title |
|---|
| 梅念等: "基于过热区域搜索的多电源复杂配电网故障定位方法", 《电网技术》 * |
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Application publication date: 20181106 |