CN114024601B - Power distribution network line fault area indication system and control method thereof - Google Patents
Power distribution network line fault area indication system and control method thereof Download PDFInfo
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- CN114024601B CN114024601B CN202111367014.3A CN202111367014A CN114024601B CN 114024601 B CN114024601 B CN 114024601B CN 202111367014 A CN202111367014 A CN 202111367014A CN 114024601 B CN114024601 B CN 114024601B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0791—Fault location on the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/009—Topology aspects
- H04Q2011/0092—Ring
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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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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention relates to a distribution network line fault area indication system and a control method thereof, wherein the system comprises a centralized control unit, an acquisition unit and an optical fiber ring network communication network; the acquisition units are multiple groups and are distributed and arranged at preset positions of the power distribution network line so as to acquire the electric quantity at the positions; the centralized control unit is in communication connection with the plurality of groups of acquisition units through an optical fiber ring network communication network and is used for receiving the electric quantity acquired by the acquisition units and determining and indicating a fault area according to the electric quantity. The invention adopts the optical fiber ring network communication network to realize data communication, positions the fault area of the complex line of the distribution network, adapts to the switching of various operation modes of the line of the distribution network, and has more flexible acquisition units without following switch configuration; by adopting an overcurrent direction comparison criterion, the data synchronization requirement is lower; therefore, the power failure time can be effectively reduced, and the workload of operation and maintenance personnel is reduced.
Description
Technical Field
The invention relates to the technical field of distribution network automation, in particular to a distribution network line fault area indication system and a control method thereof.
Background
At present, a main distribution network station mode is mainly adopted for distribution network line fault area indication, and the mode is based on public network or private network data transmission, and information processing is carried out by the main distribution network station by means of a DTU\FTU intelligent terminal in an area, so that a fault area indication function is realized. For the scenario that the distribution network area has only one line (with multiple branches), the investment cost is high, and the feasibility of the adoption is not available at present. However, the traditional fault indicator needs manual field observation, which brings inconvenience to operation and maintenance work. Neither of these approaches provides a good solution for complex line fault area indications.
In some areas with undeveloped power supply networks, a circuit with multiple branches supplies power to the whole area, a circuit breaker and a relay protection device are only arranged at the outlet of a transformer substation, load switches are adopted along branches of the circuit, and a plurality of power supply points are also arranged on the circuit. How to realize the convenient, fast and effective fault area indication of the simple distribution network, improve the power supply reliability, furthest ensure power supply equipment, shorten the power failure time, overcome the limitation of the traditional fault area indication, become the problem of attention of the current power supply department, however, no economic, fast and effective research result exists nowadays, and no related report is seen.
Disclosure of Invention
Based on the above situation in the prior art, the invention aims to provide a power distribution network line fault area indication system and a control method thereof, which are used for reducing power failure time for indicating the power distribution network line fault area, reducing workload of operation and maintenance staff, providing convenience for distribution network staff, especially the staff in less developed areas, and reducing inspection distance.
In order to achieve the above object, according to one aspect of the present invention, there is provided a distribution network line fault area indication system, including a centralized control unit, an acquisition unit, and an optical fiber ring network communication network;
the acquisition units are multiple groups and are distributed and arranged at preset positions of the power distribution network line so as to acquire the electric quantity at the positions;
the centralized control unit is in communication connection with the plurality of groups of acquisition units through an optical fiber ring network communication network and is used for receiving the electric quantity acquired by the acquisition units and determining and indicating a fault area according to the electric quantity.
Further, the device also comprises a time setting device;
the time setting device is connected with the centralized control unit to send a second pulse signal to the centralized control unit.
Furthermore, the centralized control unit uses any one of second pulse time, B code time, network SNTP time and self-keeping time sent by the time setting device to time.
Furthermore, the acquisition unit uses any one of GOOSE report Wen Duishi, IEEE1588 time synchronization and B code time synchronization to perform time synchronization.
Further, the line is a multi-power point multi-branch line.
According to another aspect of the present invention, there is provided a control method of the distribution network line fault area indication system according to the first aspect of the present invention, including the steps of:
the centralized control unit performs time synchronization with each acquisition unit;
each acquisition unit sends up sampling data according to fixed intervals;
the centralized control unit receives the sampling data of each acquisition unit, calculates according to the sampling data of each acquisition unit, judges the operation mode, and indicates a fault area when the starting condition and the action condition are met.
Further, the pair of times includes:
the centralized control unit receives the second pulse signal to time;
and the centralized control unit sends out a GOOSE message to each acquisition unit through the optical fiber ring network communication network, and each acquisition unit performs time synchronization through the GOOSE message.
Further, the centralized control unit receives sampling data of each acquisition unit, calculates the power direction of the adjacent node according to the preset adjacent node identification, judges the operation mode according to a preset criterion table by combining the calculated power direction of the adjacent node, and displays the operation mode according to the judging result.
Further, the centralized control unit receives the sampling data of each acquisition unit, calculates the overcurrent direction of the adjacent node according to the preset adjacent node identification, judges the fault section according to a preset criterion table by combining the calculated overcurrent direction of the adjacent node, and indicates the fault section when the starting condition and the action condition are met.
Furthermore, the centralized control unit determines an operation mode and a fault interval according to a preset criterion table by comparing and looking up a table with an operation mode and a fault area discrimination table preset in the preset criterion table.
In summary, the invention provides a distribution network line fault area indication system and a control method thereof, wherein the system comprises a centralized control unit, an acquisition unit and an optical fiber ring network communication network; the acquisition units are multiple groups and are distributed and arranged at preset positions of the power distribution network line so as to acquire the electric quantity at the positions; the centralized control unit is in communication connection with the plurality of groups of acquisition units through an optical fiber ring network communication network and is used for receiving the electric quantity acquired by the acquisition units and determining and indicating a fault area according to the electric quantity. According to the technical scheme, the optical fiber ring network communication network is adopted to realize data communication, fault area positioning is carried out on complex lines of the distribution network, the switching of various operation modes of the lines of the distribution network is adapted, the acquisition unit does not need to follow switch configuration, and the system is more flexible; by adopting an overcurrent direction comparison criterion, the data synchronization requirement is lower; by adopting the optical fiber ring network communication architecture, the communication reliability is improved, so that the power failure time can be effectively reduced, the workload of operation and maintenance staff is reduced, convenience is brought to distribution network staff, particularly the staff in less developed areas, and the inspection distance is reduced.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a distribution network line fault area indication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of electrical connections of a distribution network line fault area indication system in accordance with an embodiment of the present invention.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
The technical scheme of the invention is described in detail below with reference to the accompanying drawings. According to an embodiment of the invention, a fault area indication system of a power distribution network is provided, and the overall structure diagram of the system is shown in fig. 1, and the system comprises a centralized control unit, an acquisition unit and an optical fiber ring network communication network, wherein the line is a multi-power point multi-branch line.
The acquisition units are multiple groups, and the multiple groups of acquisition units are distributed and installed at preset positions of the power distribution network line so as to acquire the electric quantity at the positions. Each acquisition unit comprises electric quantity acquisition equipment such as a current transformer and a voltage transformer, and the installation position of the electric quantity acquisition equipment is a preset position of a power distribution network line, and is usually a key position of the power distribution network line. Each acquisition unit selects installation points according to the principles of convenient fault investigation, concise electric area division and small operation and maintenance workload under the same installation and construction conditions.
The centralized control unit is in communication connection with the plurality of groups of acquisition units through an optical fiber ring network communication network and is used for receiving the electric quantity acquired by the acquisition units and determining and indicating a fault area according to the electric quantity.
The device also comprises a time setting device which is connected with the centralized control unit and used for sending a second pulse signal to the centralized control unit.
The centralized control unit may perform time synchronization by using any one of pulse per second time synchronization, B-code time synchronization, network SNTP time synchronization, and self-conservation time synchronization transmitted by the time synchronization device. Each acquisition unit can adopt any one of GOOSE report Wen Duishi, IEEE1588 time synchronization and B code time synchronization to perform time synchronization.
According to another embodiment of the present invention, there is provided a control method of the power distribution network line fault area indication system according to the first embodiment of the present invention, including the steps of:
the centralized control unit performs time synchronization with each acquisition unit, for example, the centralized control unit receives a second pulse signal to perform time synchronization; the centralized control unit sends out a GOOSE message to each acquisition unit through the optical fiber ring network communication network, and each acquisition unit performs time synchronization through the GOOSE message.
Each acquisition unit sends up sampling data according to fixed intervals;
the centralized control unit receives the sampling data of each acquisition unit, calculates according to the sampling data of each acquisition unit, judges the operation mode, and indicates a fault area when the starting condition and the action condition are met. The centralized control unit receives the sampling data of each acquisition unit, calculates the power direction of the adjacent node according to the preset adjacent node identification, judges the operation mode according to a preset criterion table by combining the calculated power direction of the adjacent node, and displays the operation mode according to the judging result. The centralized control unit receives the sampling data of each acquisition unit, calculates the overcurrent direction of the adjacent node according to the preset adjacent node identification, judges the fault interval according to a preset criterion table by combining the calculated overcurrent direction of the adjacent node, and indicates the fault interval when the starting condition and the action condition are met. The centralized control unit determines an operation mode and a fault interval according to a preset criterion table by comparing and looking up a table with an operation mode and a fault area discrimination table preset in the preset criterion table. Taking the number of adjacent nodes as 3 and the number of acquisition nodes as 4 as an example, the discrimination table can be shown in table 1 and table 2, for example.
TABLE 1 operation mode criteria
In table 1, the operation mode is determined by the power supply company by changing the power supply and the switch position according to the specific situation. Modes 1-3 in the example are each full line powered for 3 power points. Modes 4-5 supply power to different loads for power supply S1. The modes 6-7 are that two power points respectively supply power to different loads, and the circuits run in different areas at the same time. Modes 8-10 are line operation and shutdown zoning execution.
TABLE 2 fault region criteria
The invention is further illustrated by the following specific examples.
The distribution network complex line fault region indication system is shown in fig. 2, and an electrical connection schematic diagram of the system comprises a centralized control unit, an acquisition unit, a communication network, CT and PT; wherein, the acquisition units, CT and PT are multiple groups; the centralized control unit is arranged in an operation and maintenance personnel working room, a plurality of groups of acquisition units, CT and PT are distributed and arranged at dividing points of a distribution line area, as shown in points (1), (2), (3) and (4), in the figure, S1-3 are power supply points, L1-4 are load points, and K1-10 are switches.
The method comprises the following steps:
step one: and determining the position of the installation acquisition unit according to the electric architecture and the inspection radius of operation and maintenance personnel, and dividing a fault area according to the installation position of the acquisition unit.
Step two: and (5) defining adjacent nodes according to the serial numbers of the installation positions of the acquisition units, and carrying out ID identification.
Step three: the centralized control unit may receive a second pulse, a clock system with B-code pair as a reference, or employ network SNTP pair or self-clocking. And the acquisition units are clocked by the GOOSE message, the acquisition units send data information at fixed time intervals, the time intervals are 250 microseconds, and the centralized control unit receives sampling data with ID marks of the acquisition units.
Step four: the centralized control unit calculates the power direction of each node according to the sampling data of each acquisition unit, and the operation mode is judged by looking up a table according to the calculation result.
Step five: the centralized control unit calculates the current magnitude and the overcurrent direction of each node according to the sampling data of each acquisition unit, and the fault area is judged by looking up a table according to the calculation result.
The circuit is a three-power-point power supply circuit, the centralized control unit is arranged in an operation and maintenance personnel duty room, the three power points do not operate in parallel, and only one power supply is used for the same load at the same time.
The clock system adopts GOOSE message time synchronization or IEEE1588 time synchronization.
Specifically, the collection units, PT, and CT in this example fig. 2 are distributed in terms of the installation positions and numbers of the collection units, PT, and CT, and the principles of convenient inspection (within 10 km), convenient construction of the installation environment (no obstacle), and simple division of the electrical area (at least one installation site on each big branch).
In particular, in the embodiment shown in fig. 1, each acquisition unit interacts with the centralized control unit to sample data, and the synchronization error of the data is allowed to be within 5 ms. Each acquisition unit is ID identified according to the location shown in fig. 2.
Specifically, the centralized control unit calculates the power direction of each node according to the sampling data sent by each acquisition unit. When the point S1 in the definition figure 2 is a power supply point for supplying power, the power direction of each node is positive, and the sign is 1. The opposite direction when the power direction is opposite is identified as-1. The power direction is marked as 0 (no voltage or no flow) when no discrimination result exists. The direction characteristic angle may be defined. The operation mode is determined based on the power direction comparison table 1.
Specifically, the centralized control unit calculates the overcurrent direction of each node according to the sampling data sent by each acquisition unit. When the point S1 in the figure 2 is defined as a power supply point for supplying power, each node is in forward overcurrent during failure, and the mark is 1. The opposite overcurrent is marked-1 when the overcurrent direction is opposite to the overcurrent direction. The overcurrent direction is marked as 0 (no overcurrent) when not actuated. The overcurrent direction characteristic angle may be defined. The fault area is discriminated based on the overcurrent direction lookup table 2.
In summary, the invention relates to a distribution network line fault area indication system and a control method thereof, wherein the system comprises a centralized control unit, an acquisition unit and an optical fiber ring network communication network; the acquisition units are multiple groups and are distributed and arranged at preset positions of the power distribution network line so as to acquire the electric quantity at the positions; the centralized control unit is in communication connection with the plurality of groups of acquisition units through an optical fiber ring network communication network and is used for receiving the electric quantity acquired by the acquisition units and determining and indicating a fault area according to the electric quantity. According to the technical scheme, the optical fiber ring network communication network is adopted to realize data communication, fault area positioning is carried out on complex lines of the distribution network, the switching of various operation modes of the lines of the distribution network is adapted, the acquisition unit does not need to follow switch configuration, and the system is more flexible; by adopting an overcurrent direction comparison criterion, the data synchronization requirement is lower; by adopting the optical fiber ring network communication architecture, the communication reliability is improved, so that the power failure time can be effectively reduced, the workload of operation and maintenance staff is reduced, convenience is brought to distribution network staff, particularly the staff in less developed areas, and the inspection distance is reduced.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and are in no way limiting of the invention. Accordingly, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present invention should be included in the scope of the present invention. Furthermore, the appended claims are intended to cover all such changes and modifications that fall within the scope and boundary of the appended claims, or equivalents of such scope and boundary.
Claims (8)
1. The power distribution network line fault area indication system is characterized by comprising a centralized control unit, an acquisition unit and an optical fiber ring network communication network;
the acquisition units are multiple groups and are distributed and arranged at preset positions of the power distribution network line so as to acquire the electric quantity at the positions;
the centralized control unit is in communication connection with the plurality of groups of acquisition units through an optical fiber ring network communication network and is used for receiving the electric quantity acquired by the acquisition units and determining and indicating a fault area according to the electric quantity;
the control method of the system comprises the following steps:
the centralized control unit performs time synchronization with each acquisition unit;
each acquisition unit sends up sampling data according to fixed intervals;
the centralized control unit receives sampling data of each acquisition unit, calculates according to the sampling data of each acquisition unit, judges the operation mode, and indicates a fault area when the starting condition and the action condition are met;
the centralized control unit receives the sampling data of each acquisition unit, calculates the overcurrent direction of the adjacent node according to the preset adjacent node identification, judges a fault interval according to a preset criterion table by combining the calculated overcurrent direction of the adjacent node, and indicates the fault interval when the starting condition and the action condition are met.
2. The system of claim 1, further comprising a time synchronization device;
the time setting device is connected with the centralized control unit to send a second pulse signal to the centralized control unit.
3. The system according to claim 2, wherein the centralized control unit performs the time synchronization using any one of a second pulse time synchronization, a B code time synchronization, a network SNTP time synchronization, and a self-time synchronization transmitted by the time synchronization device.
4. The system of claim 3, wherein the acquisition unit uses any one of GOOSE report Wen Duishi, IEEE1588 time-pair, and B-code time-pair for time-pair.
5. The system of claim 4, wherein the line is a multi-power point multi-drop line.
6. The system of claim 1, wherein the pair of times comprises:
the centralized control unit receives the second pulse signal to time;
and the centralized control unit sends out a GOOSE message to each acquisition unit through the optical fiber ring network communication network, and each acquisition unit performs time synchronization through the GOOSE message.
7. The system of claim 1, wherein the centralized control unit receives the sampled data from each acquisition unit, calculates the power direction of the neighboring node according to the preset neighboring node identifier, determines the operation mode according to the preset criterion table by combining the calculated power direction of the neighboring node, and displays the operation mode according to the determination result.
8. The system according to claim 6 or 7, wherein the centralized control unit determines the operation mode and the fault section by comparing the operation mode and the fault section discrimination table preset in the preset criterion table with the operation mode and the fault section discrimination table according to the preset criterion table.
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| CN111682508A (en) * | 2020-04-10 | 2020-09-18 | 南京智汇电力技术有限公司 | Differential protection and rapid self-healing method suitable for regional power distribution network |
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| CN102611086B (en) * | 2012-03-27 | 2015-01-07 | 许继电气股份有限公司 | Centralized protection system and method for region distribution network |
| CN103354353B (en) * | 2013-06-24 | 2015-06-17 | 国家电网公司 | Intelligent power-distribution-network whole-line quick-reacting main protection and determination system and method |
| CN103956717B (en) * | 2014-05-27 | 2016-09-07 | 国家电网公司 | A kind of microgrid adaptive overcurrent protection method |
| CN104155582B (en) * | 2014-08-29 | 2016-10-19 | 上海交通大学 | Distribution line fault section location method based on Full wave shape information |
| CN105226619B (en) * | 2015-10-28 | 2018-09-25 | 南京新联电子股份有限公司 | The outer fault distinguishing method of distributed feeder automation area inner region |
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