CN113013871A - Load transfer method for power distribution network equipment during fault and maintenance - Google Patents
Load transfer method for power distribution network equipment during fault and maintenance Download PDFInfo
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- CN113013871A CN113013871A CN202110094671.9A CN202110094671A CN113013871A CN 113013871 A CN113013871 A CN 113013871A CN 202110094671 A CN202110094671 A CN 202110094671A CN 113013871 A CN113013871 A CN 113013871A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention belongs to the technical field of electric power, and particularly relates to a load transfer method for power distribution network equipment during fault and maintenance, which comprises the following steps: acquiring equipment information of target equipment; acquiring topology information of a large feeder circuit where the equipment information is located; establishing a topology analysis model based on the topology information of the large feeder line; tracking the target equipment by using a topology analysis model according to the power grid in each direction to turn on and turn off the equipment to obtain a minimum isolation selection set; tracking each external test by taking the minimum isolation selection set as a starting point to obtain each power supply selection set and each load selection set, and determining a load set needing to be transferred from each load selection set; acquiring a transfer path set connected with each load set based on a topological analysis model; carrying out the weight estimation of the transfer path on the transfer path set; and outputting and displaying the switching result based on the switching path weight estimation. The invention ensures the minimum long-time power failure range and determines the most appropriate load transfer scheme.
Description
Technical Field
The invention belongs to the technical field of electric power, and particularly relates to a load transfer method for power distribution network equipment during fault and maintenance.
Background
With rapid progress of social economy, the electricity load increases year by year, so that the urban power distribution system structure is increasingly complex, the number of load nodes is more and more, and power failure accidents occur frequently, so that not only is great economic loss caused, but also normal operation of the society is influenced. As the power distribution network bears the task that the power system transmits to the user for the last kilometer, the power distribution network is directly connected with the user, and the safety and the stability of the operation of the power distribution network are guaranteed.
Because of the diversification and the complication of the structure of the power distribution network, when the fault recovery technology is needed to be adopted in an accident, the fault recovery scheme is mostly obtained by the experience of dispatching personnel, the safety of the fault recovery scheme cannot be guaranteed, potential safety hazards are caused to the power distribution system, and secondary accidents are possibly caused. With the more mature distribution automation and remote control technologies, the load transfer of the distribution network becomes one of the main means for fault recovery of the distribution network.
In the prior art, the function of recovering power supply in a non-fault area can be completed through a power grid dispatching technical system and a distribution network automation system, but the power failure range is too large, the power failure range needs to be further reduced, namely, the long-time power failure range is minimum, the prior art cannot meet the requirement, and the power failure load equipment needs to be supplied again.
The existing load transfer technology is only transferred to the opposite feeder line, and the like, if the power bottleneck of a transfer line is not considered, the situations of overload of the transfer line, complex operation of the transfer line and the like are likely to occur, larger loss is caused, and the consideration of convenience is avoided.
Disclosure of Invention
In order to solve the technical problems, the invention provides a load transfer method for power distribution network equipment during fault and maintenance, so as to provide an accurate load transfer scheme.
A load transfer method for power distribution network equipment during fault and maintenance comprises the following steps:
acquiring equipment information of target equipment;
acquiring topology information of a large feeder circuit where the equipment information is located;
establishing a topology analysis model based on the topology information of the large feeder line;
tracking the target equipment by using a topology analysis model according to the power grid in each direction to turn on and turn off the equipment to obtain a minimum isolation selection set;
tracking each external test by taking the minimum isolation selection set as a starting point to obtain each power supply selection set and each load selection set, and determining a load set needing to be transferred from each load selection set;
acquiring a transfer path set connected with each load set based on a topological analysis model;
carrying out the weight estimation of the transfer path on the transfer path set;
and outputting and displaying the switching result based on the switching path weight estimation.
Preferably, the device information includes a device ID, a device type, and a device name.
Preferably, the tracking to each external test by using the minimum isolation selection set as a starting point to obtain each power supply selection set and each load selection set includes:
and tracking each external test by taking the minimum isolation selection set as a starting point, wherein if a live power supply point is tracked, the power supply selection set is the power supply selection set, and otherwise, the load selection set is the load selection set.
Preferably, the determining the load sets to be transferred from the respective load measurement selection sets includes:
if the distribution transformer equipment does not exist in the load measurement and selection set, the processing is not needed; and if the distribution equipment exists in the load measurement selection set, determining the load set to be transferred.
Preferably, the performing of the handover path weight estimation on the handover path set includes:
acquiring measurement information and rated capacity information of each load set;
obtaining rated capacity information of a large feeder line to be supplied;
acquiring distribution transformer load measurement information and rated capacity information of a large feeder line to be supplied;
judging whether the load rate of the transfer line meets the transfer condition or not;
judging the simplicity of the switch operation steps;
judging the power supply radius of each transfer path;
and calculating the weight value of each transfer path.
Preferably, after the obtaining of the large feeder topology information where the device information is located, the method further includes:
and carrying out data validity check on the topology information of the large feeder line, and reporting data error information if the data is invalid.
Preferably, after the obtaining of the large feeder topology information where the device information is located, the method further includes:
and preprocessing the topological information of the large feeder circuit.
Preferably, the preprocessing the topology information of the large feeder circuit includes:
and deleting equipment irrelevant to the establishment of the topology analysis model and the load transfer, deleting invalid data, and combining the same type of wire and cable equipment.
The technical scheme adopted by the invention has the following beneficial effects:
1. tracking the target equipment to be switched on and off according to the power grid in each direction by using a topological analysis model to obtain a minimum isolation selection set, so that the minimum long-time power failure range is ensured;
2. tracking each external test by taking the minimum isolation selection set as a starting point to obtain each power supply selection set and each load selection set, and determining a load set needing to be transferred from each load selection set; acquiring a transfer path set connected with each load set based on a topological analysis model; carrying out the weight estimation of the transfer path on the transfer path set; and outputting and displaying the switch-over result based on the switch-over path weight estimation so as to determine the most appropriate load switch-over scheme.
The following detailed description of the present invention will be provided in conjunction with the accompanying drawings.
Drawings
The invention is further described with reference to the accompanying drawings and the detailed description below:
fig. 1 is a schematic flow chart of a load transfer method during fault and maintenance of power distribution network equipment according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
When a line breaks down or is overhauled due to power failure, the line can be tripped and power cut firstly, the outgoing line switch of a substation can be tripped for the line without realizing distribution network automation (full-line power failure), and the switching power failure range is a little smaller for the line with the distribution network automation. However, the blackout range is still too large, and the blackout range needs to be further reduced, namely, the long-time blackout range is minimum, and the long time is the overhaul time.
The isolation of the maintenance area (or the fault area) is to analyze which switches can realize the purpose of minimum long-time power failure range after the pulling-closing operation according to the running state (the state of switching on and switching off equipment) of the current line.
The power failure is necessary in the isolation range, the power supply measurement and selection set outside the isolation area does not have a power failure for a long time, but the load equipment in the load measurement and selection set outside the isolation area needs to be transferred to other lines if transfer conditions exist.
Referring to fig. 1, a load transfer method for power distribution network equipment failure and maintenance includes the following steps:
s1: device information of a target device is acquired.
Firstly, a user inputs equipment information including but not limited to equipment ID, equipment type, equipment name and the like of fault and maintenance equipment for identification, and the user inputs line information of the fault and maintenance equipment or searches the line information of the fault and maintenance equipment through a database.
In one embodiment, the user input is checked for validity, and if the user input is incorrect, a failure is returned and the load transfer analysis cannot be performed.
S2: and acquiring the topology information of the large feeder circuit where the equipment information is located.
Firstly, all the equipment and structure information of a large feeder line where the equipment is located are obtained through service, a database, storage information and the like, and the structure information needs to contain contact information and the like of each equipment.
In one embodiment, after the information is acquired, data validity check is performed on the information, and data error information is reported or directly returned to the system and cannot be calculated according to the quality of the data.
S3: and establishing a topology analysis model based on the topology information of the large feeder line.
The method comprises the steps of firstly preprocessing equipment of a large feeder line, including acquiring resource data, deleting equipment irrelevant to establishment of a topology analysis model and load transfer, deleting invalid data, combining wire and cable equipment of the same type and the like. And after the data are processed, establishing a topology analysis model according to the connection information data between the devices for subsequent topology traversal and analysis.
S4: and tracking the target equipment by using a topological analysis model according to the power grid in each direction to turn on and turn off the equipment to obtain a minimum isolation selection set.
And tracking the target equipment by using a topological analysis model according to the power grid in each direction to obtain a minimum isolation selection set, so that the minimum long-time power failure range is ensured.
The switching-off equipment in the distribution network is mainly divided into the following types:
(1) circuit breaker (also called switch): the device can be pulled in and out with load and can also cut off fault current.
(2) A load switch: can be pulled in with load but can not cut off the fault current.
(3) Disconnecting switch (also called knife): the device can not be pulled on or pulled off with load, and can not cut off fault current, and the purpose is only one: creating a distinct break point.
(4) The drop-out fuse (also called drop-out fuse) can be pulled and closed with load and also can cut off fault current, and is mainly used for branch lines with on-column distribution and light load.
(5) The common fuse (also called fuse) is only used for the in-station voltage change or change and is irrelevant to the distribution network analysis.
The power distribution line power failure maintenance needs to be opened and closed (group):
1) the devices to be pulled open on the line trunk, branch and switchyard substations are the above three types of isolatable devices.
2) A pole-mounted transformer: pulling out a drop-out fuse matched with the distribution transformer or pulling out a low-voltage main knife switch of the distribution transformer.
3) Distribution station or box transformer: and (3) pulling off 10kV cut-off equipment (or a distribution transformer low-voltage main knife switch) in the station.
And processing the found breaking equipment group, wherein the circuit breaker and the switch are treated as a group, isolated circuit breakers and isolated switches on the line are not allowed, and if the isolated fault (the fault of data maintenance) is encountered during analysis and calculation, an alarm is required and the isolated circuit breaker and the isolated switch cannot be used as an isolatable equipment.
S5: tracking each external test by taking the minimum isolation selection set as a starting point to obtain each power supply selection set and each load selection set, and determining the load set to be transferred from each load selection set.
In step S4, the power grid tracking of the disconnected device (group) is started from the service device (or fault point) in each direction, and a minimum isolation selection set, which is the isolation set, is tracked. And tracking each external test by taking the minimum isolation selection set as a starting point, wherein if a live power point (10KV outgoing switch) is tracked, the power test selection set is the power test selection set, otherwise, the load test selection set is the load test selection set, and the load test selection set is recorded in each selection set respectively. And judging the load measurement selection set, if no distribution transformer equipment exists in the set, determining the load set and the load equipment which need to be transferred without processing.
S6: and acquiring a transfer path set connected with each load set based on the topological analysis model.
All the large feeders connected with the large feeder where the equipment is located are obtained through topology traversal, and a user can configure the number of stages to which the large feeders are connected in an indirect connection mode, wherein the large feeders are directly connected or indirectly connected. And then finding one or more forwarding paths connected with each load set through topology analysis.
S7: and carrying out the weight estimation of the transfer path on the transfer path set.
Measurement information and rated capacity information of each load set need to be acquired; obtaining rated capacity information of a large feeder line to be supplied; acquiring distribution transformer load measurement information and rated capacity information of a large feeder line to be supplied; and determining whether the load rate of the transfer line meets the transfer condition or not through the measurement and the capacity information. And judging the simplicity of the switch operation steps. And judging the power supply radius of each transfer path. And scoring and weight estimation are carried out on each transfer path, and the weight of each transfer path is calculated.
S8: and outputting and displaying the switching result based on the switching path weight estimation.
And outputting the power supply result according to the power supply path weight obtained in the step, thereby determining the most appropriate load power supply scheme. The transshipment results are shown on the single line diagram. And displaying the converted result on the GIS geographic map. And the result text is output for reference of the allocating personnel.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that the invention is not limited thereto, and may be embodied in other forms without departing from the spirit or essential characteristics thereof. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (8)
1. A load transfer method for power distribution network equipment during fault and maintenance is characterized by comprising the following steps:
acquiring equipment information of target equipment;
acquiring topology information of a large feeder circuit where the equipment information is located;
establishing a topology analysis model based on the topology information of the large feeder line;
tracking the target equipment by using a topology analysis model according to the power grid in each direction to turn on and turn off the equipment to obtain a minimum isolation selection set;
tracking each external test by taking the minimum isolation selection set as a starting point to obtain each power supply selection set and each load selection set, and determining a load set needing to be transferred from each load selection set;
acquiring a transfer path set connected with each load set based on a topological analysis model;
carrying out the weight estimation of the transfer path on the transfer path set;
and outputting and displaying the switching result based on the switching path weight estimation.
2. The method according to claim 1, wherein the equipment information includes equipment ID, equipment type, and equipment name.
3. The method according to claim 1, wherein the tracking each external measurement from the minimum isolation selection set as a starting point to obtain each power source selection set and load selection set comprises:
and tracking each external test by taking the minimum isolation selection set as a starting point, wherein if a live power supply point is tracked, the power supply selection set is the power supply selection set, and otherwise, the load selection set is the load selection set.
4. The method according to claim 1, wherein the determining the load sets to be transferred from the load measurement selection sets comprises:
if the distribution transformer equipment does not exist in the load measurement and selection set, the processing is not needed; and if the distribution equipment exists in the load measurement selection set, determining the load set to be transferred.
5. The method according to claim 1, wherein the estimating the weights of the transfer paths of the transfer path set comprises:
acquiring measurement information and rated capacity information of each load set;
obtaining rated capacity information of a large feeder line to be supplied;
acquiring distribution transformer load measurement information and rated capacity information of a large feeder line to be supplied;
judging whether the load rate of the transfer line meets the transfer condition or not;
judging the simplicity of the switch operation steps;
judging the power supply radius of each transfer path;
and calculating the weight value of each transfer path.
6. The method for load transfer during fault and overhaul of the power distribution network equipment according to any one of claims 1 to 5, wherein after the obtaining of the topology information of the large feeder line where the equipment information is located, the method further comprises:
and carrying out data validity check on the topology information of the large feeder line, and reporting data error information if the data is invalid.
7. The method for load transfer during fault and overhaul of the power distribution network equipment according to any one of claims 1 to 5, wherein after the obtaining of the topology information of the large feeder line where the equipment information is located, the method further comprises:
and preprocessing the topological information of the large feeder circuit.
8. The method for load transfer during fault and overhaul of the power distribution network equipment according to claim 7, wherein the preprocessing of the topology information of the large feeder line comprises:
and deleting equipment irrelevant to the establishment of the topology analysis model and the load transfer, deleting invalid data, and combining the same type of wire and cable equipment.
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| CN114841385A (en) * | 2022-05-18 | 2022-08-02 | 广西电网有限责任公司 | Generation system for visual overhaul rehearsal of power grid |
| CN116073375A (en) * | 2023-02-28 | 2023-05-05 | 国网安徽省电力有限公司阜阳供电公司 | Load transfer management method based on distribution network graph model and data analysis |
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