CN117239939B - Distribution automation protection method realized by cooperation of master station and distributed terminal - Google Patents
Distribution automation protection method realized by cooperation of master station and distributed terminal Download PDFInfo
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Abstract
The invention relates to the technical field of power distribution of a power system, in particular to a power distribution automation protection method realized by matching a master station and a distributed terminal, which is realized based on a power distribution automation system comprising the master station and the distributed terminal, wherein the power distribution automation system comprises a master station, a plurality of on-off switches or interconnecting switches and a plurality of distributed terminals, and each on-off switch or interconnecting switch is connected with one distributed terminal; the distributed terminal collects current information of a branch connected with the distributed terminal and position information of a switching switch and a contact switch, and stores and uploads the current information and the switch position information to a master station; the interaction of current information and position information is realized among the distributed terminals; the master station and the distributed terminals cooperatively realize power restoration of a fault area. The distributed terminal is used for rapidly positioning and isolating faults, and the main station integrally calculates the recovery power supply of the non-fault area, so that the time for positioning and isolating faults is shortened, and the speed of recovering the power supply is improved.
Description
Technical Field
The invention relates to the technical field of power distribution of power systems, in particular to a power distribution automation protection method realized by matching a master station with a distributed terminal.
Background
Most of the current power supply systems are centralized power supply systems combining large units, large power grids and high voltages, and although such power supply systems provide more than ninety percent of power load worldwide, the defects of the power supply systems themselves are more and more difficult to meet the requirements on the quality and the safety reliability of energy sources and power supply. Any faults of a large unit and a large power grid can cause huge and profound effects, and even the whole network is crashed when serious, so that national safety is finally endangered. In addition, a centralized power supply system represented by a large unit and a large power grid has difficulty in solving the problem of power load variation, and it is not practical to construct a power plant to cope with a short power peak. Based on this, developed western countries generally consider: the distributed power generation system and the large power grid system are combined, and compared with the traditional power grid system, the investment cost and the energy consumption are lower. The centralized power supply phenomenon in China is more remarkable, and a certain-scale centralized power supply and distribution network can be built only after a long period of time in a remote area and huge cost is spent; the distributed power supply can effectively solve the limitation of a centralized power supply system.
Although distributed power has found a great deal of application in power systems, it is largely affected by environmental factors, and its volatility is large; in addition, the uncertainty of the power can affect the safety and reliability and stable operation of the power system after the distributed power supply is connected. The current reform of the power system and the background of large power construction do not increase the demand and the installation quantity of the distributed power supply, which can bring the difficult problem to the safe, stable and reliable operation of the power distribution network.
At present, the power resource can basically meet daily requirements, and the main problems are more in the power distribution link. The traditional distribution network structure is a radiation type single-end power supply, so that the whole circuit has to be cut off whenever a circuit fault occurs. In addition, the old distribution network has relatively low automation degree, and after the power failure occurs, the power is cut off by means of a fuse or trip protection of a distributor, or the power is manually pulled; this phenomenon is increasingly prominent with increasing power generation.
Feeder automation includes: and (1) monitoring and controlling data. The method is mainly used for remotely operating on-site running equipment and carrying out real-time monitoring. And (2) automatically isolating and recovering after the fault. When faults such as single-phase grounding, multi-phase grounding and phase-to-phase short circuit occur, the faults are automatically identified by means of feedback of the terminal, and power supply is recovered after the faults are removed.
CN103840439a discloses a distribution automation protection method implemented by combining a master station and a distributed terminal, when a single fault occurs in a distribution network, the distribution automation terminal determines a fault area, controls a breaker at an outlet of the distribution network to be opened, then the distribution automation terminal opens sectional switches at two ends of the fault area to perform fault isolation, and finally the distribution automation terminal controls the breaker, a tie switch and the sectional switches at the outlet of the distribution network to be closed, and transfers loads of a non-fault area of the distribution network, so that power supply recovery of the non-fault area is realized. However, the method belongs to a centralized distributed terminal, communication can only exist between a master station and the distributed terminal, and the defects of incapability of communicating information among the distributed terminals, high engineering cost, long processing time, untimely reaction and single protection strategy exist.
The common main station and distributed terminal cooperation mode at present is not only centralized, but also distributed, a special communication network needs to be built for a distributed system, and the capacity of global coordination is lacking in fault recovery.
Aiming at the defects, the application designs a distribution automation protection method realized by the cooperation of a master station and a distributed terminal, so that information interaction between the distributed terminals is realized, and the distributed terminals are used for rapidly positioning and isolating faults; the main station integrally plans the recovery power supply of the non-fault area, so that the fault positioning and isolation time is effectively shortened, the power supply recovery speed is accelerated, and the timeliness is higher.
Disclosure of Invention
The invention provides a distribution automation protection method realized by matching a master station and a distributed terminal, which aims to solve the problems.
In a first aspect, the present invention provides a power distribution automation protection method implemented by cooperation of a master station and a distributed terminal, which is implemented based on a power distribution automation system including the master station and the distributed terminal, where the power distribution automation system includes a master station, a plurality of on/off switches or tie switches, and a plurality of distributed terminals, each on/off switch or tie switch is connected to a distributed terminal, and the distributed terminal collects current information of a branch connected to the distributed terminal and position information of the on/off switch and the tie switch, and stores and uploads the current information and the switch position information to the master station.
The interaction of current information and position information is realized among the distributed terminals; different from the conventional centralized and distributed designs, interaction between the distributed terminals is realized on the basis of connecting the distributed terminals with a master station, so that the timeliness of information sharing is improved, the function allocation of the master station and the distributed terminals is facilitated, the response timeliness is improved, and fault processing is performed rapidly.
The power distribution automation protection method comprises the following steps:
step 1, when a single fault occurs in the power distribution network, the distributed terminal collects current information of a branch connected with the distributed terminal and position information of a switching switch and a connecting switch, and the current information and the position information are interacted with the adjacent distributed terminal, and a power distribution automation system determines a fault position based on interaction information of the distributed terminal. Defining the current direction in the current information acquired by the distributed terminal; the distribution automation system determines the direction of current flowing out of or into the on-off switch or the interconnection switch during normal operation as the initial current direction; when each distributed terminal receives the current information and the position information interacted by the adjacent distributed terminal, comparing the initial current direction with the current direction in the interacted current information; when the initial current direction is inconsistent with the current direction in the interactive current information, determining that the branch where the interactive current information is located or the branch connected with the current information is faulty. Based on the performance and parameter range of the distributed terminal, the fault position is determined through the interaction information of the distributed terminal, the fault positioning time is effectively shortened, the fault position is determined according to the positive and negative directions of the current, and the positioning accuracy is improved.
And step 2, determining an island range by the distributed terminal. Taking the branches and the load nodes as initial information, classifying the branches, and giving different weights to the branches of different classifications; the priority of the load node is determined, the distributed power supply is used as a base node, the branch with high weight and the load node connected with the branch are used as an initial island, the branch connected with the initial island is expanded, and after the island range is determined, the disconnection of a disconnection switch or a connection switch connected with the island is controlled, so that the fault is quickly isolated. By setting branch classification, assignment and priority, the island range is defined according to the interactive information of the distributed terminals, so that the precise definition of the island range is realized, and the range of continuous power supply is ensured to the greatest extent.
And 3, updating the electric network topology by the distributed terminal by adopting a tracking dyeing method and a secondary dyeing method, and continuously supplying power to the non-fault area. The distributed terminal performs tracking dyeing of the distributed power supply according to the stored electrical topological structure, and uploads tracking dyeing information to the master station; the master station turns on the on/off switch of the branch where the distributed power supply is located in the non-fault area; the distributed terminal automatically searches all the switching switches or interconnection switches which are similar to the switching switches of the branch circuit where the distributed power supply is located, and uploads the search result to the master station; the main station performs secondary dyeing on all branches capable of supplying power to the load; the main station performs matching of the distributed power supply and the load power according to the secondary dyeing result of the branch; after the dyeing is finished, the distributed terminal stores the updated electrical topology structure, and uploads the updated electrical topology structure to the master station, and the secondary dyeing adopts different colors to dye different branches. The method for updating the electric network topology ensures the continuous power supply of the non-fault area and improves the reliability and stability of the continuous power supply.
And 4, the master station and the distributed terminals cooperatively recover the power supply of the fault area. And the distributed terminal in the fault area sends a switching-off instruction to a switching-on/off switch or a contact switch connected with the distributed terminal, and immediately interacts fault isolation information to the distributed terminal in the area to be recovered after switching-off is successful, and if a fault recovery scheme is not found, the fault isolation information is uploaded to a master station to request the master station to assist. The master station and the distributed terminals cooperatively realize power supply restoration of the fault area, restore the tie switches one by setting effective parameters, play the role of the master station in overall global information, determine the optimal release scheme of the fault area and realize orderly power supply restoration.
In a second aspect, the present invention provides a power distribution automation protection device comprising a memory and a processor; wherein the memory is configured to store one or more computer instructions, wherein the one or more computer instructions are executed by the processor to perform the steps of the above-described method.
In a third aspect, the present invention provides a computer readable storage medium having stored thereon computer instructions which when executed by a processor perform the steps of the above method.
In a fourth aspect, a computer program product comprises a computer program/instruction which, when executed by a processor, implements the steps of the above method.
The technical scheme provided by the invention can comprise the following beneficial effects:
(1) The distribution automation system comprises a main station and a plurality of distributed terminals, wherein interaction of current information and position information is realized among the distributed terminals; different from the conventional centralized and distributed designs, the interaction between the distributed terminals is realized on the basis of connecting the distributed terminals with the master station, so that the timeliness of information sharing is improved, the function allocation of the master station and the distributed terminals is facilitated, the distributed terminals are used for rapidly positioning and isolating faults, the master station is used for comprehensively planning the recovery power supply of non-fault areas, the synergistic effect between the master station and the distributed terminals is improved, and the fault processing time is greatly shortened.
(2) Based on the performance and parameter range of the distributed terminal, the fault position is determined through the interaction information of the distributed terminal, the fault positioning time is effectively shortened, the fault position is determined according to the positive and negative directions of the current, and the positioning accuracy is improved.
(3) By setting branch classification, assignment and priority, the island range is defined according to the interactive information of the distributed terminals, so that the precise definition of the island range is realized, and the range of continuous power supply is ensured to the greatest extent.
(4) The distributed terminal updates the electric network topology in time by adopting a tracking dyeing method and a secondary dyeing method, so that the continuous power supply of a non-fault area is ensured, and the reliability and stability of the continuous power supply are improved.
(5) The master station and the distributed terminals cooperatively realize power supply restoration of the fault area, restore the tie switches one by setting effective parameters, play the role of the master station in overall global information, determine the optimal release scheme of the fault area and realize orderly power supply restoration.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art;
FIG. 1 is a power distribution automation protection method of the present invention;
FIG. 2 is a power distribution automation system of the present invention;
reference numerals: 1-3 and 5-7 represent on-off switches; 4 represents a tie switch; 8-15 represent distributed terminals.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
It should be noted that the term "comprises," "comprising," or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The various embodiments and features of the embodiments described below may be combined with one another without conflict.
Example 1
The invention provides a distribution automation protection method realized by matching a master station and a distributed terminal, which is realized based on a distribution automation system comprising the master station and the distributed terminal, and is combined with fig. 1 and 2, wherein the distribution automation system comprises a master station, a contact switch 4, six opening and closing switches and eight distributed terminals 8-15, a transformer substation I is connected with the opening and closing switch 1, the opening and closing switch 2 and the opening and closing switch 3 are sequentially connected, the opening and closing switch 3 is connected with the contact switch 4, the opening and closing switch 5, the opening and closing switch 6 and the opening and closing switch 7 are sequentially connected, a transformer substation II is connected with the opening and closing switch 7, and each opening and closing switch 1-3, 5-7 and the contact switch 4 are correspondingly connected with the distributed terminals 8-15.
The on-off switch 1 is connected with the distributed terminal 9, the on-off switch 2 is connected with the distributed terminal 14, the on-off switch 3 is connected with the distributed terminal 10, the contact switch 4 is connected with the distributed terminal 11, the on-off switch 5 is simultaneously connected with one end of the distributed terminal 8 and the distributed terminal 12, the other end of the distributed terminal 8 is connected with a distributed power supply, the on-off switch 6 is connected with the distributed terminal 15, and the on-off switch 7 is connected with the distributed terminal 13. The distributed terminal 8-15 collects the current information of the branch connected with the distributed terminal and the position information of the on-off switch 1-3, 5-7 or the tie switch 4 connected with the distributed terminal, and stores the collected current information and the switch position information.
Meanwhile, the distributed terminals 9-15 are connected with adjacent distributed terminals and are connected with the master station, and the distributed terminals 9-15 upload the acquired current information and switch position information to the master station while storing the information.
In the prior art, the distributed terminals generally adopt a centralized or distributed design, wherein all information processing functions of the centralized design are realized by a master station, and the functions of the distributed terminals can be realized only after the information is uploaded by each distributed terminal, so that the timeliness is poor; the distributed design can respond to the fault condition in time, but the distributed terminal can only acquire the information of the branch where the distributed terminal is located, so that the response is incomplete, island is easy to fall into, and the interconnectivity between the distributed terminal and each branch is poor.
Through the interaction of current information and position information between the distributed terminals 9-15, the mutual information interaction between the distributed terminals 9-15 and the master station is realized on the basis that the distributed terminals 9-15 are connected, thereby being beneficial to improving the timeliness of information sharing and improving the comprehensiveness and accuracy of decision-making of the distributed terminals.
Each of the distributed terminals 9-15 is connected with the main station, when faults occur between the on-off switch 3 and the interconnecting switch 4, all the distributed terminals monitor the branch current where the distributed terminals 9-15 are located, information interaction is realized between the distributed terminals 9-15, the main station is not required to carry out overall analysis on global information, functions of the main station and the distributed terminals 9-15 are distributed, and the distributed terminals rapidly position and isolate faults according to the collected branch current information and the position information of the on-off switch or the interconnecting switch connected with the distributed terminals and the related information of the distributed terminals connected with the distributed terminals; the main station comprehensively processes the recovered power supply of the non-fault area according to the branch current information collected by all the distributed terminals and the position information of the on-off switch or the contact switch connected with the branch current information, so that the cooperation between the main station and the distributed terminals can be improved, the response timeliness is greatly improved, and the fault processing is fast.
The distribution automation protection method comprises the following steps:
step 1, when a short circuit fault occurs between the on-off switch 3 and the tie switch 4 of the power distribution network, the distributed terminal collects current information of a branch connected with the on-off switch and position information of the on-off switch 1-3, 5-7 or the tie switch 4, the distributed terminal 9-15 interacts the information to the adjacent distributed terminal, and the power distribution automation system determines a fault position based on the interaction information of the distributed terminal 9-15, particularly the branch current information collected by the distributed terminal 10 and the distributed terminal 11.
Specifically, the distributed terminal collects current information of a branch connected with the distributed terminal and position information of the on-off switches 1-3, 5-7 or the tie switch 4, and defines a current direction in the current information; the following can be made: the direction in which the current flows from the on-off switch or the tie switch is defined as the forward direction, and the direction in which the current flows into the on-off switch or the tie switch is defined as the reverse direction.
In combination with the current operation mode, the distribution automation system determines the direction of current flowing out of or into the on-off switch or the interconnection switch during normal operation as the initial current direction.
When each of the distributed terminals 9 to 15 receives the current information and the position information interacted with the adjacent distributed terminal, the initial current direction is compared with the current direction in the interacted current information.
When the initial current direction is inconsistent with the current direction in the interactive current information, or variation occurs between the forward direction and the reverse direction of a certain branch, determining that the branch where the interactive current information is located or the branch connected with the branch fails.
The current flowing into the on-off switch 3 during normal operation is opposite to the current collected by the distributed terminal 10 after the occurrence of the short-circuit fault, and the current flowing out of the tie switch 4 during normal operation is opposite to the current collected by the distributed terminal 11 after the occurrence of the short-circuit fault, which indicates that the fault occurs between the on-off switch 3 and the tie switch 4. According to the performance and data acquisition of the distributed terminals, the fault position is determined through the interaction information of the distributed terminals, the fault positioning time is greatly shortened, the fault position is determined according to the positive and negative directions of the current, and the positioning accuracy is improved.
Step 2, the distributed terminal determines an island range, and the distributed terminal connected with the island controls corresponding on-off switches 1-3 and 5-7, and rapidly opens the on-off switch 3 and the interconnecting switch 4 to realize fault isolation; and taking the branches and the load nodes as initial information, and classifying the branches, wherein the branches connected with the nodes of the distributed power supply or the island in the connection dividing process are primary branches, the branches connected with the load nodes are secondary branches, and the branches connected with the main power supply nodes or the first and second substations are tertiary branches.
Different weights are given to the primary branch, the secondary branch and the tertiary branch; the weight of the first-stage branch is 0.5, the weight of the second-stage branch is 0.3, and the weight of the third-stage branch is 0.2.
The priority of the load node is determined, and the importance of the load node is positively correlated with the priority.
The distributed power supply is used as a base node, the branch close to the base node is determined by combining the initial information, and the branch with high weight and the load node connected with the branch are used as an initial island by combining a power balance principle; if the weight values of the branches are the same, comparing the priorities of loads connected with the branches, wherein the branches with high priorities and load nodes connected with the branches are used as initial islands; the power balance principle is as follows: the power balance of the distributed power supply and the load inside the island is that:
；
y represents a set of distributed power supplies contained in an island; z represents a set of load nodes within the island; p (P) DGi Representing the electric quantity emitted by the ith distributed power supply in the island; p (P) Lj Representing the active power of the jth load node in the island; p (P) loss Representing network loss within an island.
On the basis of the initial island, the extension is terminated after the extension to the branch connected with the initial island is satisfied until the range of the island is maximum.
By setting branch classification, assignment and priority, the island range is defined according to the interactive information of the distributed terminals, so that the precise definition of the island range is realized, and the range of continuous power supply is ensured to the greatest extent.
And step 3, updating the electric network topology by the distributed terminal through a tracking dyeing method and a secondary dyeing method, and realizing continuous power supply to the non-fault area.
The dyeing method is a conventional way for determining the topology of the electrical network, but tracking dyeing is an effective way for determining the structure of the electrical network after failure, and a way for combining tracking dyeing and secondary dyeing is provided in consideration of the fact that primary dyeing is prone to error dyeing for short-time failure or automatic recovery failure.
And the distributed terminal tracks and dyes the branch where the distributed power supply is located according to the stored electrical topological structure, and uploads the tracking and dyeing information to the master station.
After a short-circuit fault occurs between the on-off switch 3 and the interconnecting switch 4, the master station turns on the on-off switch of the branch where the distributed power supply is located in the non-fault area; the distributed terminal automatically searches all the on-off switches or the contact switches close to the on-off switches of the branch circuit where the distributed power supply is located, and uploads the search result to the master station.
To exclude the effect of reclosing, the master station will dye twice all branches capable of powering the load after a predetermined time interval (e.g. a set time interval of 0.5 seconds) has been reached.
The master station performs matching of the distributed power supply and the load power according to the secondary dyeing result, if the distributed power supply can meet the power requirement of the load, all sectional contact switches close to the switch of the power supply path of the distributed power supply are closed, and tracking is finished; if the requirement cannot be met, continuing to select a new sectionalizing switch, and repeating the step of secondary dyeing.
After the tracking dyeing and the secondary dyeing are finished, the distributed terminal stores the updated electrical topology structure, and uploads the updated electrical topology structure to the master station to complete updating of the electrical topology structure.
The secondary dyeing can adopt different colors to dye different branches. For example, the tracking stain may be green, the secondary stain may be yellow, and the different branches may be different colors.
The distributed terminal of the application updates the electrical network topology in time by adopting the tracking dyeing and secondary dyeing method, so that the timeliness and the accuracy of the electrical network topology updating are improved, the continuous power supply of a non-fault area is ensured, and the reliability and the stability of the continuous power supply are improved.
And 4, the master station and the distributed terminals cooperatively realize power restoration of the fault area. The distributed terminal 10 in the fault area sends a switching-off instruction to the switching-on/off switch 3 and the distributed terminal 11 sends a switching-off instruction to the interconnection switch 4, and the switching-on/off switch 3 and the interconnection switch 4 are disconnected; after detecting that the on-off switch 3 and the interconnection switch 4 are successfully disconnected, the distributed terminals 10 and 11 immediately interact fault isolation information with the distributed terminals 12 and 14 in the area to be recovered, wherein the fault isolation information comprises effective parameters of the on-off switch 2 and the on-off switch 5, the effective parameters are 0, the fact that the distributed terminals 10-12 and 14 do not find a recovery scheme after the interaction of the information is indicated, and the fault isolation information needs to be uploaded to a master station to request the master station to assist;
if the distributed terminal does not detect that the on-off switch 3 and the interconnection switch 4 are successfully switched off within the set time, fault isolation information is interacted with the distributed terminal 14 in the area to be recovered, and meanwhile, the effective parameter of the on-off switch 2 is set to be-1; if the other distributed terminal 12 in the area to be recovered also receives the fault isolation information and the effective parameter of the on-off switch 5 is-1, the fault isolation failure is indicated, the on-off switch 2 and the on-off switch 5 execute the switching-off operation, and a recovery scheme is selected.
After the distributed terminal 11 connected with the contact switch 4 interacts information with the similar distributed terminals 10 and 12, if the contact switch 4 is judged to be powered off at one side, the phase of preparing for switching on is immediately entered; after receiving the fault isolation information, the distributed terminal 11 connected with the interconnection switch 4 in the switching-on preparation stage compares the effective parameter of the interconnection switch 4 with the effective parameter of the switch in the fault isolation information, and if the effective parameter of the interconnection switch is equal to the effective parameter of the switch in the fault isolation information, the interconnection switch executes switching-on operation.
After monitoring the switching-on success information sent by other distributed terminals, the distributed terminal 11 connected with the interconnecting switch 4 immediately sends power restoration information to the distributed terminal in the area to be restored, and repeats the step of preparing for switching on. So that the on-off switch 3 and the tie switch 4 are smoothly switched on after the short-circuit fault contacts. The power supply recovery of the fault area is realized through the cooperation of the master station and the distributed terminals, the recovery of the contact switches is realized one by one through setting effective parameters, the capacity of the master station for comprehensively planning global information is exerted, the optimal release scheme of the fault area is determined, and the ordered recovery of power supply is realized.
Example 2
An embodiment of the present application provides a power distribution automation protection device, including a memory for storing one or more computer instructions; a processor. The method of any of the first aspects described above is implemented when one or more computer instructions are executed by a processor.
The communication interface is also included, and the memory, the processor and the communication interface are electrically connected with each other directly or indirectly so as to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The memory may be used to store software programs and modules that, by being executed by the processor, perform various functional applications and data processing. The communication interface may be used for communication of signaling or data with other node devices.
In another aspect, embodiments of the present application provide a computer-readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method as in any of the first aspects above. The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and variations may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (7)
1. The distribution automation protection method is realized based on a distribution automation system comprising a main station and distributed terminals, wherein the distribution automation system comprises a main station, a plurality of on-off switches or interconnecting switches and a plurality of distributed terminals, each on-off switch or interconnecting switch is connected with the distributed terminal, the distributed terminal collects current information of a branch connected with the distributed terminal and position information of the on-off switch or interconnecting switch, and the current information and the switch position information are stored and uploaded to the main station; the method is characterized in that the interaction of current information and position information is carried out among the distributed terminals; the power distribution automation protection method comprises the following steps:
step 1, when a single fault occurs in a power distribution network, a distributed terminal interacts collected current information and position information to a distributed terminal adjacent to the distributed terminal, and a fault position is determined based on the interaction information of the distributed terminal;
step 2, determining an island range by the distributed terminal, classifying the branches by taking the branches and the load nodes as initial information, and giving different weights to the branches of different classifications; determining the priority of load nodes, taking a distributed power supply as a base node, taking a branch with high weight and a load node connected with the branch as an initial island, expanding the branch to the branch connected with the initial island, and after the island range is determined, controlling a switching switch or a connecting switch connected with the island to be switched off so as to quickly isolate faults;
step 3, the distributed terminal updates the electric network topology by adopting a tracking dyeing method and a secondary dyeing method, and continuously supplies power to the non-fault area;
step 4, the master station and the distributed terminals cooperatively recover the power supply of the fault area;
the method for updating the electrical network topology in the step 3 specifically comprises the following steps: the distributed terminal tracks and dyes the branch where the distributed power supply is located according to the stored electrical topological structure, and uploads tracking and dyeing information to the master station; the master station turns on the on/off switch of the branch where the distributed power supply is located in the non-fault area; the distributed terminal automatically searches all the switching switches or interconnection switches which are similar to the switching switches of the branch circuit where the distributed power supply is located, and uploads the search result to the master station; the main station performs secondary dyeing on all branches capable of supplying power to the load; the main station performs matching of the distributed power supply and the load power according to the secondary dyeing result of the branch; after the dyeing is finished, the distributed terminal stores the updated electrical topology structure and uploads the updated electrical topology structure to the master station.
2. The method for automatically protecting power distribution realized by cooperation of a master station and distributed terminals according to claim 1, wherein the method for determining the fault location in step 1 comprises the following steps: defining the current direction in the current information acquired by the distributed terminal; the distribution automation system determines the direction of current flowing out of or into the on-off switch or the interconnection switch during normal operation as the initial current direction; when each distributed terminal receives the current information and the position information interacted by the adjacent distributed terminal, comparing the initial current direction with the current direction in the interacted current information; when the initial current direction is inconsistent with the current direction in the interactive current information, determining that the branch where the interactive current information is located or the branch connected with the current information is faulty.
3. The power distribution automation protection method realized by combining a main station and a distributed terminal according to claim 1, wherein the secondary dyeing adopts different colors to dye different branches.
4. The power distribution automation protection method implemented by cooperation of a master station and a distributed terminal according to claim 1, wherein step 4 specifically comprises: and the distributed terminal in the fault area sends a switching-off instruction to a switching-on/off switch or a contact switch connected with the distributed terminal, and immediately interacts fault isolation information to the distributed terminal in the area to be recovered after switching-off is successful, and if a fault recovery scheme is not found, the fault isolation information is uploaded to a master station to request the master station to assist.
5. An automatic power distribution protection device comprises a memory and a processor; wherein the memory is for storing one or more computer instructions, wherein the one or more computer instructions are executed by the processor to implement the power distribution automation protection method of any of claims 1-4.
6. A computer readable storage medium having stored thereon computer instructions, wherein the computer instructions when executed by a processor implement the power distribution automation protection method of any of claims 1-4.
7. A computer program product comprising a computer program or instructions which, when executed by a processor, implements the power distribution automation protection method of any of claims 1 to 4.
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