CN113872237B - Island division method for power distribution network - Google Patents
Island division method for power distribution network Download PDFInfo
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- CN113872237B CN113872237B CN202111096497.8A CN202111096497A CN113872237B CN 113872237 B CN113872237 B CN 113872237B CN 202111096497 A CN202111096497 A CN 202111096497A CN 113872237 B CN113872237 B CN 113872237B
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Classifications
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The invention provides a power distribution network island division method, wherein a power distribution network comprises a plurality of unreliable power supplies and a plurality of reliable power supplies; the method comprises the following steps: acquiring an unreliable power supply which is not marked into an island as a first current unreliable power supply, and acquiring a reliable power supply as the first current reliable power supply; if the first current reliable power supply is not drawn into an island, if the total amount of uncontrollable loads on the connecting paths of the first current unreliable power supply and the first current reliable power supply is smaller than the total capacity of the first current unreliable power supply and the first current reliable power supply, connecting the first current unreliable power supply and the first current reliable power supply to obtain the first island, otherwise, acquiring the next reliable power supply to repeat until all the reliable power supplies are acquired, and acquiring the next unreliable power supply to repeat until all the unreliable power supplies are acquired. The reliability of power distribution is improved, and the power distribution device has wider application range.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a power distribution network island division method.
Background
The short-time supporting capability of a distributed power supply (DG) is utilized in the power distribution network to supply power to important loads, a short-time island is built, the power failure time of the important loads is reduced, and the method has important significance in improving the reliability of the power distribution network. For the distribution networks with different voltage levels, the island needs to be planned according to actual requirements, so that the requirements and constraints of important load recovery, island power balance, node voltage, branch current and the like are met. As a preliminary preparation for black starts, island planning will directly affect the scope and success of black starts.
However, the existing island division method generally does not consider the controllability of the load, and the DG is regarded as reliability DG, that is, DG can be independently used for island restoration in the island, however, the fluctuation of some unreliable DG is relatively large, and is difficult to adjust, so that the requirement cannot be met.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a power distribution network island division method.
In one embodiment, the invention provides a method for island division of a power distribution network, the power distribution network comprising a plurality of unreliable power sources and a plurality of reliable power sources; the method comprises the following steps:
Acquiring an unreliable power supply which is not divided into islands as a first current unreliable power supply, acquiring a reliable power supply as a first current reliable power supply, and judging whether the first current reliable power supply is divided into islands or not;
if the first current reliable power supply is not divided into island, calculating the total capacity of the first current unreliable power supply and the first current reliable power supply;
if the total amount of uncontrollable loads on the connection paths of the first current non-reliable power supply and the first current reliable power supply is smaller than the total capacity of the first current non-reliable power supply and the first current reliable power supply, connecting the first current non-reliable power supply and the first current reliable power supply to obtain a first island, otherwise, acquiring the next reliable power supply as the first current reliable power supply and reentering the step of judging whether the first current reliable power supply is divided into islands;
and (3) until all the reliable power supplies are acquired, acquiring the next unreliable power supply as a first current unreliable power supply, and re-entering the step of acquiring one reliable power supply as the first current reliable power supply until all the unreliable power supplies are acquired.
In one embodiment, obtaining a reliability power supply as a first current reliability power supply includes:
Respectively calculating the total amount of uncontrollable loads on each reliable power supply which is not acquired and the first current unreliable power supply connecting path;
and acquiring a reliability power supply corresponding to the smallest uncontrollable load total amount in the uncontrollable load total amounts as a first current reliability power supply.
In one embodiment, after the step of obtaining all unreliable power sources, the power distribution network island division method further includes:
judging whether an unreliable power supply which is not marked with an island exists or not, if so, re-entering the step of acquiring the unreliable power supply which is not marked with the island as a first current unreliable power supply until the division result is not changed.
In one embodiment, after the step of determining whether the first current reliable power source has been islanding, the power distribution network islanding method further includes:
if the first current reliable power supply is already divided into an island, respectively calculating the total amount of uncontrollable loads on each power supply and a first current unreliable power supply connecting path in the island;
if the residual capacity of the island is larger than or equal to the smallest uncontrollable load total amount of the uncontrollable loads, the first current unreliable power supply is divided into the island to obtain a first island, otherwise, the next reliable power supply is obtained to serve as the first current reliable power supply, and the step of judging whether the first current reliable power supply is divided into the island is performed again.
In one embodiment, after the step of obtaining all unreliable power sources, the power distribution network island division method further includes:
judging whether a reliable power supply which is not scratched into an island exists or not;
if yes, acquiring a reliable power supply which is not divided into islands as a second current reliable power supply, acquiring a first island as a first current island, and acquiring a power supply in the first current island as a first current island power supply;
calculating the total capacity of the residual capacity of the first current island and the capacity of the second current reliability power supply;
if the total load on the connection paths of the second current reliable power supply and the first current island power supply is smaller than the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply, the second current reliable power supply is considered to be capable of being connected with the first current island power supply and recording, and then the power supply in the next first current island is acquired as the first current island power supply and re-enters the step of calculating the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply;
acquiring the next first island as the first current island and reentering the step of acquiring the power supply in one first current island as the first current island power supply until all the power supplies in the first current island are acquired;
And judging whether a first island capable of being connected with a second current reliable power supply is found or not until all the first islands are obtained, if so, adding the second current reliable power supply into the corresponding first island to obtain the second island, if not, obtaining the next reliable power supply which is not divided into the islands as the second current reliable power supply, and reentering the step of obtaining one first island as the first current island until all the reliable power supplies which are not divided into the islands are obtained.
In one embodiment, obtaining a power source in a first current island as a first current island power source includes:
respectively calculating the total load on a second current reliability power supply connection path of each unobtained power supply in the first current island;
acquiring a power supply in a first current island corresponding to the smallest load total amount in the plurality of load total amounts as a first current island power supply;
after the step of calculating the total capacity of the remaining capacity of the first current island and the capacity of the second current reliable power source, the power distribution network island division method further includes:
and if the total load on the connecting paths of the second current reliable power supply and the first current island power supply is larger than the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply, the second current reliable power supply is considered to be incapable of being connected with the first current island power supply, then the next first island is acquired as the first current island, and the step of acquiring the power supply in the first current island as the first current island power supply is re-entered.
In one embodiment, after the step of obtaining all the reliable power sources that are not islanding, the power distribution network islanding method further includes:
judging whether unreliable power supplies which are not scratched into islands exist or not;
if yes, acquiring an unreliable power supply which is not divided into islands as a second current unreliable power supply, acquiring a second island as a second current island, and acquiring a power supply in the second current island as a second current island power supply;
calculating the total capacity of the remaining capacity of the second current island and the capacity of the second current unreliable power supply;
if the total load of the second current non-reliable power supply and the second current island power supply connection path is smaller than the total capacity of the residual capacity of the second current island and the capacity of the second current non-reliable power supply, the second current non-reliable power supply is considered to be connected with the second current island power supply and recorded, then the power supply in the next second current island is acquired as the second current island power supply, and the step of calculating the total capacity of the residual capacity of the second current island and the capacity of the second current non-reliable power supply is re-entered;
Obtaining the next second island as the second current island and reentering the step of obtaining the power supply in one second current island as the second current island power supply until all the power supplies in the second current island are obtained;
and judging whether a second island capable of being connected with a second current unreliable power supply is found or not until all second islands are obtained, if so, adding the second current unreliable power supply into the corresponding second island to obtain a third island, if not, obtaining the next unreliable power supply which is not divided into the islands as the second current unreliable power supply, and reentering the step of obtaining one second island as the second current island until all the unreliable power supplies which are not divided into the islands are obtained.
In one embodiment, obtaining the power source in the second current island as the second current island power source includes:
respectively calculating the total load of each unobtained power supply in the second current island and the total load of the second current unreliable power supply connecting path;
acquiring a power supply in the second current island corresponding to the smallest load total amount in the plurality of load total amounts as a second current island power supply;
After the step of calculating the total capacity of the remaining capacity of the second current island and the capacity of the second current unreliable power source, the above-mentioned power distribution network island division method further includes:
and if the total load on the connection paths of the second current unreliable power supply and the second current island power supply is larger than the total capacity of the residual capacity of the second current island and the capacity of the second current unreliable power supply, the second current unreliable power supply is considered to be incapable of being connected with the second current island power supply, then the next second island is acquired as the second current island, and the step of acquiring the power supply in the second current island as the second current island power supply is reentered.
In one embodiment, after the step of obtaining all unreliable power sources that are not islanding, the power distribution network islanding method further includes:
judging whether load nodes which are not marked into islands exist or not;
if so, determining the importance of each load node according to the load quantity of the load node, the total uncontrollable load quantity on the power supply connection path from the load node to the third island and the total line resistance on the power supply connection path from the load node to the third island;
And adding the load nodes which are not divided into islanding into the corresponding third islanding according to the importance degree from large to small, so as to obtain a fourth islanding.
In one embodiment, determining the importance of each load node based on the load amount of the load node, the total amount of uncontrollable load on the load node and the power connection paths in the third island, and the total line resistance on the load node and the power connection paths in the third island comprises:
according to the expressionObtaining importance of each load node;
wherein omega i Represents the importance of the ith load node, L i Representing the load quantity of the ith load node, P UL Representing the uncontrollable load quantity on the connection path of the power source and the ith load node in the third island, r i Representing the total line resistance on the power connection path in the ith load node and third island.
By the power distribution network island dividing method, connection of a reliable power supply and an unreliable power supply is preferentially considered when the island is divided, so that the situation that the independent work of the unreliable power supply does not exist in the constructed island is ensured; furthermore, in calculating the load quantity, an uncontrollable load quantity is considered in particular; the reliability of power distribution is improved, and the power distribution device has wider application range.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Wherein:
FIG. 1 is a schematic flow chart of a first island according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a second island according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a third island according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a fourth island according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an exemplary power distribution network according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a structure of an example power distribution network after island division according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In one embodiment, the invention provides a method for island division of a power distribution network, the power distribution network comprising a plurality of unreliable power sources and a plurality of reliable power sources; the method comprises the following steps:
acquiring an unreliable power supply which is not divided into islands as a first current unreliable power supply, acquiring a reliable power supply as a first current reliable power supply, and judging whether the first current reliable power supply is divided into islands or not;
if the first current reliable power supply is not divided into island, calculating the total capacity of the first current unreliable power supply and the first current reliable power supply;
if the total amount of uncontrollable loads on the connection paths of the first current non-reliable power supply and the first current reliable power supply is smaller than the total capacity of the first current non-reliable power supply and the first current reliable power supply, connecting the first current non-reliable power supply and the first current reliable power supply to obtain a first island, otherwise, acquiring the next reliable power supply as the first current reliable power supply and reentering the step of judging whether the first current reliable power supply is divided into islands;
And (3) until all the reliable power supplies are acquired, acquiring the next unreliable power supply as a first current unreliable power supply, and re-entering the step of acquiring one reliable power supply as the first current reliable power supply until all the unreliable power supplies are acquired.
The division method in this embodiment mainly modifies the topology structure of the existing power distribution network to achieve the purpose of optimizing division, so that some reliable power supplies are added with corresponding islands, some reliable power supplies exist independently, and the reliable power supplies exist independently and can be connected to form islands which meet the connection requirement.
By the power distribution network island dividing method, connection of a reliable power supply and an unreliable power supply is preferentially considered when the island is divided, so that the situation that the independent work of the unreliable power supply does not exist in the constructed island is ensured; furthermore, in calculating the load quantity, an uncontrollable load quantity is considered in particular; the reliability of power distribution is improved, and the power distribution device has wider application range.
In one embodiment, obtaining a reliability power supply as a first current reliability power supply includes:
respectively calculating the total amount of uncontrollable loads on each reliable power supply which is not acquired and the first current unreliable power supply connecting path;
And acquiring a reliability power supply corresponding to the smallest uncontrollable load total amount in the uncontrollable load total amounts as a first current reliability power supply.
When the reliable power supply is acquired, the reliable power supply with the smallest total uncontrollable load on the path is preferentially acquired, so that the reliable power supply capable of being connected can be more quickly found, and the overall searching efficiency is improved.
In one embodiment, after the step of obtaining all unreliable power sources, the power distribution network island division method further includes:
judging whether an unreliable power supply which is not marked with an island exists or not, if so, re-entering the step of acquiring the unreliable power supply which is not marked with the island as a first current unreliable power supply until the division result is not changed.
The non-reliable power supplies are drawn into the corresponding islands to form new islands, so that the capacity of the islands and the total load corresponding to the islands to be recovered are changed, and after all the non-reliable power supplies are obtained, the non-reliable power supplies can be repeatedly obtained again, and drawing into the new islands is tried, so that the integrity of the division is improved.
In one embodiment, after the step of determining whether the first current reliable power source has been islanding, the power distribution network islanding method further includes:
If the first current reliable power supply is already divided into an island, respectively calculating the total amount of uncontrollable loads on each power supply and a first current unreliable power supply connecting path in the island;
if the residual capacity of the island is larger than or equal to the smallest uncontrollable load total amount of the uncontrollable loads, the first current unreliable power supply is divided into the island to obtain a first island, otherwise, the next reliable power supply is obtained to serve as the first current reliable power supply, and the step of judging whether the first current reliable power supply is divided into the island is performed again.
And judging whether the non-reliable power supply can be added into the island or not after the acquired reliable power supply is already divided into the island.
In order to make the above embodiment of obtaining the first island clearer, the above embodiment will be described in an integrated manner, as shown in fig. 1, including:
(1) Traversing the unreliability DG;
(2) Traversing the reliability DG to obtain the shortest path (the uncontrollable load amount passing through the shortest path is minimum) from the current unreliability DG to the reliability DG, and selecting the reliability DG with the minimum shortest path as a target DG to attempt connection;
(3) Judging whether the target DG is already marked into an island, if not, executing the step (4); if already being scratched, go to step (5);
(4) Calculating the sum P of the capacities of the unreliable DG and the target DG G The total amount of uncontrollable loads passing through the connecting paths of the two is P UL If P UL <P G The unreliable DG can be connected with the target DG to form a primary island, the unreliable DG is marked as a marked island, and the island residual capacity is P G -P UL Step (6) is entered; otherwise, returning to the step (2);
(5) Traversing the distributed power supply in the island to which the target DG belongs to obtain the minimum uncontrollable load quantity P from the distributed power supply in the island to the recovery required by the unreliable DG ux Judging whether the residual capacity in the island is more than or equal to P ux If yes, the unreliability DG is marked into the island, the island residual capacity is recorded, and the step (6) is entered. If the island residual capacity does not meet the requirement, returning to the step (2);
(6) Judging whether the unreliability DG is traversed, if so, repeating the cycle until the dividing result is unchanged, and ending the flow; otherwise, returning to the step (1).
In one embodiment, after the step of obtaining all unreliable power sources, the power distribution network island division method further includes:
judging whether a reliable power supply which is not scratched into an island exists or not;
if yes, acquiring a reliable power supply which is not divided into islands as a second current reliable power supply, acquiring a first island as a first current island, and acquiring a power supply in the first current island as a first current island power supply;
Calculating the total capacity of the residual capacity of the first current island and the capacity of the second current reliability power supply;
if the total load on the connection paths of the second current reliable power supply and the first current island power supply is smaller than the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply, the second current reliable power supply is considered to be capable of being connected with the first current island power supply and recording, and then the power supply in the next first current island is acquired as the first current island power supply and re-enters the step of calculating the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply;
acquiring the next first island as the first current island and reentering the step of acquiring the power supply in one first current island as the first current island power supply until all the power supplies in the first current island are acquired;
and judging whether a first island capable of being connected with a second current reliable power supply is found or not until all the first islands are obtained, if so, adding the second current reliable power supply into the corresponding first island to obtain the second island, if not, obtaining the next reliable power supply which is not divided into the islands as the second current reliable power supply, and reentering the step of obtaining one first island as the first current island until all the reliable power supplies which are not divided into the islands are obtained.
In the process of obtaining the first island, only the unreliable power supply is used for connecting with the reliable power supply, so that part of the reliable power supply can exist independently and is not connected with other power supplies to form an island, and in order to divide the part of the reliable power supply into the island, the number of the final islands is reduced as much as possible, so that the stability and the power supply capacity of island operation are enhanced.
In one embodiment, obtaining a power source in a first current island as a first current island power source includes:
respectively calculating the total load on a second current reliability power supply connection path of each unobtained power supply in the first current island;
acquiring a power supply in a first current island corresponding to the smallest load total amount in the plurality of load total amounts as a first current island power supply;
after the step of calculating the total capacity of the remaining capacity of the first current island and the capacity of the second current reliable power source, the power distribution network island division method further includes:
and if the total load on the connecting paths of the second current reliable power supply and the first current island power supply is larger than the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply, the second current reliable power supply is considered to be incapable of being connected with the first current island power supply, then the next first island is acquired as the first current island, and the step of acquiring the power supply in the first current island as the first current island power supply is re-entered.
When the power supply in the first island is acquired, the power supply with the smallest total load on the path is preferentially acquired, so that the next first island is directly acquired when the total capacity is judged to be unsatisfied with the requirement, the power supply capable of being connected can be more rapidly found, and the overall searching efficiency is improved.
In order to make the above embodiment of obtaining the second island clearer, the above embodiment will be described in an integrated manner, as shown in fig. 2, including:
(1) Searching each island which is formed currently;
(2) Traversing DG nodes in the island;
(3) Obtaining the minimum load U required to be restored between the current reliability DG and the DG nodes in the island;
(4) Judging whether the sum of the residual capacity of the current island and the current reliability DG capacity is enough to recover the minimum load U, if so, recording DG node information of the island internal energy and the current reliability DG connection, and executing the step (5); if the capacity is insufficient, directly executing the step (6);
(5) Judging whether DG nodes in the current island are traversed, and if so, executing the step (6); otherwise, searching a DG node in the next island, and returning to the step (3);
(6) Judging whether island is traversed or not, if so, executing the step (7); otherwise, entering the next island, and returning to the step (2);
(7) Judging whether the reliability DG finds an island which can be added, if so, marking the reliability DG to be added into the island; otherwise, the reliability DG can only form islands alone;
(8) Judging whether all the reliability DGs are traversed, if so, ending the flow; if not, returning to the step (1) with the reliability DG of the next island which is not marked as the center;
in one embodiment, after the step of obtaining all the reliable power sources that are not islanding, the power distribution network islanding method further includes:
judging whether unreliable power supplies which are not scratched into islands exist or not;
if yes, acquiring an unreliable power supply which is not divided into islands as a second current unreliable power supply, acquiring a second island as a second current island, and acquiring a power supply in the second current island as a second current island power supply;
calculating the total capacity of the remaining capacity of the second current island and the capacity of the second current unreliable power supply;
if the total load of the second current non-reliable power supply and the second current island power supply connection path is smaller than the total capacity of the residual capacity of the second current island and the capacity of the second current non-reliable power supply, the second current non-reliable power supply is considered to be connected with the second current island power supply and recorded, then the power supply in the next second current island is acquired as the second current island power supply, and the step of calculating the total capacity of the residual capacity of the second current island and the capacity of the second current non-reliable power supply is re-entered;
Obtaining the next second island as the second current island and reentering the step of obtaining the power supply in one second current island as the second current island power supply until all the power supplies in the second current island are obtained;
and judging whether a second island capable of being connected with a second current unreliable power supply is found or not until all second islands are obtained, if so, adding the second current unreliable power supply into the corresponding second island to obtain a third island, if not, obtaining the next unreliable power supply which is not divided into the islands as the second current unreliable power supply, and reentering the step of obtaining one second island as the second current island until all the unreliable power supplies which are not divided into the islands are obtained.
After the remaining reliable power supplies join the island, the remaining capacity of the island may be increased, so that the unreliable power supplies that fail to join the island in the process of obtaining the first island may try to join the island again, so as to achieve the purpose of fully utilizing all available power supplies.
In one embodiment, obtaining the power source in the second current island as the second current island power source includes:
Respectively calculating the total load of each unobtained power supply in the second current island and the total load of the second current unreliable power supply connecting path;
acquiring a power supply in the second current island corresponding to the smallest load total amount in the plurality of load total amounts as a second current island power supply;
after the step of calculating the total capacity of the remaining capacity of the second current island and the capacity of the second current unreliable power source, the above-mentioned power distribution network island division method further includes:
and if the total load on the connection paths of the second current unreliable power supply and the second current island power supply is larger than the total capacity of the residual capacity of the second current island and the capacity of the second current unreliable power supply, the second current unreliable power supply is considered to be incapable of being connected with the second current island power supply, then the next second island is acquired as the second current island, and the step of acquiring the power supply in the second current island as the second current island power supply is reentered.
When the power supply in the second island is acquired, the power supply with the smallest total load on the path is preferentially acquired, so that the next second island is directly acquired when the total capacity is judged to be unsatisfied with the requirement, the power supply capable of being connected can be more rapidly found, and the overall searching efficiency is improved.
In order to make the above embodiment of obtaining the third island clearer, the above embodiment will be described in an integrated manner, as shown in fig. 3, including:
(1) Searching each island which is formed currently;
(2) Traversing DG nodes in the island;
(3) Obtaining the minimum load U required to be restored between the current unreliable DG and DG nodes in the island x ；
(4) Judging whether the sum of the current island residual capacity and the current unreliability DG capacity is enough to recover the minimum load U x If so, recording DG node information which can be connected with the unreliable DG in the island, and executing the step (5); otherwise, directly jumping to the step (6);
(5) Judging whether DG nodes in the current island are traversed, and if so, executing the step (6); otherwise, searching for the next DG node in the island, and returning to the step (3);
(6) Judging whether each island is traversed, if so, executing the step (7); otherwise, searching for the next island, and returning to the step (2);
(7) Judging whether the non-reliability DG finds an island which can be added, if so, adding the non-reliability DG information into an island record table; otherwise, marking the unreliability DG as not bootable;
(8) Judging whether the unreliability DG is traversed, if so, ending the flow; otherwise, continuing to return to the step (1) for the next unreliability DG;
In one embodiment, after the step of obtaining all unreliable power sources that are not islanding, the power distribution network islanding method further includes:
judging whether load nodes which are not marked into islands exist or not;
if so, determining the importance of each load node according to the load quantity of the load node, the total uncontrollable load quantity on the power supply connection path from the load node to the third island and the total line resistance on the power supply connection path from the load node to the third island;
and adding the load nodes which are not divided into islanding into the corresponding third islanding according to the importance degree from large to small.
The method comprises the steps that for node loads to be recovered, a plurality of factors influencing the importance degree of the node loads are included, except for the load grade of the node loads, when the load controllability is considered, because the uncontrollable loads cannot be directly controlled by a dispatching department and can be powered once the uncontrollable loads are communicated with a power supply, an island is required to be drawn into the uncontrollable loads on a path between a target recovery node and a distributed power supply, a parameter representing the uncontrollable load quantity is added in an importance degree expression, and the importance degree is reduced to a certain extent as the parameter value is larger; in addition, line loss is generated when the target node is restored during the process of passing through the line, so that the line impedance is also taken into consideration when the importance expression is constructed, and the importance should be reduced as the corresponding parameter is larger.
In one embodiment, determining the importance of each load node based on the load amount of the load node, the total amount of uncontrollable load on the load node and the power connection paths in the third island, and the total line resistance on the load node and the power connection paths in the third island comprises:
according to the expressionGet each negativeImportance of the load node;
wherein omega i Represents the importance of the ith load node, L i Representing the load quantity of the ith load node, P UL Representing the total amount of uncontrollable loads on the connection path of the power supply and the ith load node in the third island, r i Representing the total line resistance on the power connection path in the ith load node and third island. Since the line resistance is usually small, in order to make the influence of the resistance on the importance degree manifest without affecting the degree of influence of the uncontrollable load amount and the node load, the voltage is applied (1+r) i ) To represent the resistance.
When the importance expression is quantitatively calculated, the load quantity of uncontrollable loads and the passing line impedance on the shortest path from the island to the node to be recovered are taken into consideration, namely the line loss is considered, and the method is closer to the actual engineering condition.
In order to make the above embodiment of obtaining the fourth island clearer, the above embodiment will be described in an integrated manner, as shown in fig. 4, to distinguish important levels of different loads, a first-level load level attribute is marked with l=3, a second-level load level attribute is marked with l=2, a third-level load level attribute is marked with l=1, and the power supply of the first-level load is preferentially recovered, including:
(1) Setting the importance of the load to be recovered as W, and setting the initial value of the load to be recovered as 0;
(2) Traversing island;
(3) Traversing DG nodes in the island;
(4) Traversing the load node N which is not added, and setting a node number initial value n=1;
(5) Calculating the importance w of the current load node to the current DG node and the uncontrollable load quantity p on the required starting path, judging whether the residual capacity of the current DG is enough to recover the uncontrollable load quantity p on the path, and if so, executing the step (6); otherwise, executing the step (10);
(6) Judging whether the importance degree W exceeds W, if so, executing the step (7); otherwise, jumping to the step (10);
(7) Judging whether the current DG residual capacity is enough to restore the node load after subtracting the uncontrollable load quantity p, if so, fully restoring N (N), and entering the step (9); otherwise, executing the step (8);
(8) Judging whether the load is a controllable load, if so, recovering the part of the controllable load by the allowance, and entering a step (9); if the load is uncontrollable, executing the step (10);
(9) The value of W is given to W, and relevant paths, starting nodes and information of required starting load quantity are saved, and the step (10) is entered;
(10) Judging whether the load nodes which are not marked into the island are traversed, if so, executing the step (11); otherwise, searching for the next load node, and returning to the step (5);
(11) Judging whether DG in the island is traversed or not, and executing the step (12) if the DG in the island is traversed; otherwise, finding the next DG, and returning to the step (4);
(12) Judging whether island is traversed or not, if so, executing the step (13); otherwise, entering the next island, and returning to the step (3);
(13) Judging whether a load capable of being divided into an island is found, if so, adding the load into an island list, updating island power allowance, and executing the step (14); otherwise, go to step (15);
(14) Judging whether load nodes and connection points of the load nodes on the passing path are added into other island lists, if so, merging the islands, and adding the load nodes on the path into the islands; otherwise, the load nodes on the path are added into the island. Continuing searching for the next load node of the level, and returning to the step (1);
(15) Judging whether all the load nodes of the level are traversed, if not, continuing to execute the load nodes of the next level from the step (1); otherwise, the flow ends.
When all loads are screened, the first type of loads are selected according to the first type of loads, the second type of loads are selected according to the last type of loads, and therefore, the priority recovery of the loads with high importance levels is ensured, and more important loads are recovered as much as possible.
To make all of the above embodiments easier to understand, an example is now presented, as shown in fig. 5, showing a power distribution network system with an active load of 3802.19kW. DG is introduced into the system, and the downstream nodes of the line 2-3 are all powered down due to the occurrence of a three-phase short circuit ground fault, wherein:
table 1 (DG parameter information table)
Table 2 (load importance level and controllability)
By using the power distribution network island dividing method provided by the invention, firstly three non-reliability DGs of DG1, DG5 and DG6 are connected with the rest three reliability DGs, and uncontrollable load nodes 3, 4, 5, 6, 7, 8, 9, 10, 11, 19, 20, 21, 28, 29, 30, 31, 32, 36, 52 and 65 on the DG connecting path are divided into islands, namely the DGs and the uncontrollable load form the islands together. The remaining load nodes are then scribed into islands according to importance: according to the importance level of the load, firstly searching all the primary loads, calculating according to an importance formula, and dividing the load with high importance into islands preferentially until all the primary loads are traversed, and finally dividing the primary loads of 12, 18, 35, 37, 42, 51, 57 and 62 into islands. The above search is repeated for the secondary load and the tertiary load, and the island division result is shown as the range in the curve in fig. 5, wherein the controllable load node 39 recovers 5.12kW, that is, only partially recovers, so that DG capacity is fully utilized.
The resulting island division scheme exhibited the effects shown in table 3.
Table 3 (island effect)
As can be seen from table 3, the total recovery load obtained by the present invention is very high, and the primary load can be recovered preferentially, so that the primary load recovery rate reaches 100% under the condition that DG capacity is sufficient.
The invention considers the function of the tie switch, fully utilizes the topological structure of the distribution network, can adapt to the ring network structure of the distribution network, can be popularized to other distribution networks, only needs to operate according to the dividing process, and has stronger universality; secondly, when the importance expression is quantitatively calculated, the load quantity of uncontrollable loads and the passing line impedance on the shortest path from the island to the node to be recovered are taken into consideration, namely the line loss is considered, and the method is closer to the actual engineering condition; in addition, when all loads are screened, the loads of three categories are selected according to the first category of loads, the second category of loads and the third category of loads, so that the loads with high importance levels are ensured to be recovered preferentially, and more important loads are recovered as much as possible; finally, the method has practical engineering application value in the aspect of power restoration after power failure of the power distribution network containing the distributed power source, and the importance degree value of each load node of the power distribution network can be quantified by the method provided by the invention, and important loads can be screened out as soon as possible to restore power supply to the load nodes.
Thereby avoiding the prior art that: dividing the island by only taking the load quantity and the load importance level of the node to be recovered as indexes for measuring the load importance degree, and not taking the influence of uncontrollable loads in the same bus or the same line segment on the total load quantity in the island into consideration; the influence caused by the circuit is not considered; the effect of the tie switch is not taken into consideration, so that some loads which can be accessed into the island through the tie switch cannot be recovered; DG are all considered as reliability DG, i.e. DG can be used independently in island for island restoration, however, in practice some DG are difficult to accommodate this series of defects due to the relatively large fluctuation. The island division can be guided to fully exert the power supply capability of DG, the island division has better searching capability, the power supply of important loads can be ensured to the greatest extent, and the function of a contact switch can be effectively considered.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of the appended claims.
Claims (8)
1. The island division method of the power distribution network is characterized in that the power distribution network comprises a plurality of unreliable power supplies and a plurality of reliable power supplies; the method comprises the following steps:
acquiring the unreliable power supply which is not divided into islands as a first current unreliable power supply, acquiring the reliable power supply as a first current reliable power supply, and judging whether the first current reliable power supply is divided into islands or not;
if the first current reliable power supply is not drawn into an island, calculating the total capacity of the first current unreliable power supply and the first current reliable power supply;
if the total amount of uncontrollable loads on the first current unreliable power supply and the first current reliable power supply connecting path is smaller than the total capacity of the first current unreliable power supply and the first current reliable power supply, connecting the first current unreliable power supply and the first current reliable power supply to obtain a first island, otherwise, acquiring the next reliable power supply as the first current reliable power supply and reentering the step of judging whether the first current reliable power supply is divided into the island;
Until all the reliable power supplies are obtained, obtaining the next unreliable power supply as the first current unreliable power supply, and reentering the step of obtaining one of the reliable power supplies as the first current reliable power supply until all the unreliable power supplies are obtained; after the step of determining whether the first current reliability power source has been islanded, the method further comprises:
if the first current reliable power supply is already divided into an island, respectively calculating the total amount of uncontrollable loads on each power supply in the island and the first current unreliable power supply connecting path;
if the residual capacity of the island is greater than or equal to the smallest uncontrollable load total amount of a plurality of uncontrollable loads, the first current unreliable power supply is divided into the island to obtain the first island, otherwise, the next reliable power supply is obtained to serve as the first current reliable power supply, and the step of judging whether the first current reliable power supply is divided into the island is performed again;
and after the step of obtaining all the unreliable power supplies, further comprising:
Judging whether the reliable power supply which is not scratched into an island exists or not;
if yes, acquiring the reliable power supply which is not divided into islands as a second current reliable power supply, acquiring the first island as a first current island, and acquiring the power supply in the first current island as a first current island power supply;
calculating the total capacity of the residual capacity of the first current island and the capacity of the second current reliability power supply;
if the total load on the connection paths of the second current reliable power supply and the first current island power supply is smaller than the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply, the second current reliable power supply is considered to be capable of being connected with the first current island power supply and recorded, and then the power supply in the next first current island is acquired as the first current island power supply and reenters the step of calculating the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply;
acquiring the next first island as a first current island and reentering the step of acquiring the power supply in one first current island as a first current island power supply until all the power supplies in the first current island are acquired;
And judging whether the first island capable of being connected with the second current reliable power supply is found or not until all the first islands are obtained, if so, adding the second current reliable power supply into the corresponding first islands to obtain the second islands, otherwise, obtaining the next reliable power supply which is not divided into the islands as the second current reliable power supply and reentering the step of obtaining one first island as the first current island until all the reliable power supplies which are not divided into the islands are obtained.
2. The power distribution network island division method according to claim 1, wherein the obtaining one of the reliable power supplies as a first current reliable power supply includes:
respectively calculating the total amount of uncontrollable loads on each of the reliable power supply and the first current unreliable power supply connection path which are not acquired;
and acquiring the reliability power supply corresponding to the smallest uncontrollable load total amount in the uncontrollable load total amounts as the first current reliability power supply.
3. The power distribution network island division method of claim 1 further comprising, after the step of obtaining all of the unreliable power sources:
And judging whether the unreliable power supply which is not marked with the island exists or not, if so, re-entering the step of acquiring the unreliable power supply which is not marked with the island as a first current unreliable power supply until the division result is not changed.
4. The power distribution network island division method according to claim 1, wherein the obtaining the power source in the first current island as the first current island power source includes:
respectively calculating the total load amount of each unobtained power supply in the first current island and the second current reliable power supply connection path;
acquiring a power supply in the first current island corresponding to the smallest load total amount in a plurality of load total amounts as the first current island power supply;
after the step of calculating the total capacity of the remaining capacity of the first current island and the capacity of the second current reliability power supply, further comprising:
and if the total load on the connection paths of the second current reliable power supply and the first current island power supply is larger than the total capacity of the residual capacity of the first current island and the capacity of the second current reliable power supply, the second current reliable power supply is considered to be incapable of being connected with the first current island power supply, then the next first island is acquired as the first current island, and the step of acquiring the power supply in one first current island as the first current island power supply is re-entered.
5. The power distribution network island division method of claim 4 further comprising, after the step of obtaining all the reliable power sources that are not island-wired:
judging whether the unreliable power supply which is not scratched into an island exists or not;
if yes, acquiring the unreliable power supply which is not divided into the islands as a second current unreliable power supply, acquiring the second island as a second current island, and acquiring the power supply in the second current island as a second current island power supply;
calculating the total capacity of the residual capacity of the second current island and the capacity of the second current unreliable power supply;
if the total load of the second current non-reliable power supply and the second current island power supply connection path is smaller than the total capacity of the residual capacity of the second current island and the capacity of the second current non-reliable power supply, the second current non-reliable power supply is considered to be capable of being connected with the second current island power supply and recorded, and then the power supply in the next second current island is acquired as the second current island power supply and reenters the step of calculating the total capacity of the residual capacity of the second current island and the capacity of the second current non-reliable power supply;
Obtaining the next second island as the second current island and reentering the step of obtaining the power supply in one second current island as the second current island power supply until all the power supplies in the second current island are obtained;
and judging whether the second island capable of being connected with the second current unreliable power supply is found or not until all the second islands are obtained, if so, adding the second current unreliable power supply into the corresponding second islands to obtain a third island, if not, obtaining the next unreliable power supply which is not divided into the islands as the second current unreliable power supply, and reentering the step of obtaining one second island as the second current island until all the unreliable power supplies which are not divided into the islands are obtained.
6. The power distribution network island division method according to claim 5, wherein the obtaining the power source in the second current island as the second current island power source includes:
respectively calculating the total load amount of each unobtained power supply in the second current island and the second current unreliable power supply connection path;
Acquiring a power supply in the second current island corresponding to the smallest load total amount in the plurality of load total amounts as the second current island power supply;
after the step of calculating the total capacity of the remaining capacity of the second current island and the capacity of the second current unreliable power supply, further comprising:
and if the total load on the second current unreliable power supply and the second current island power supply connecting path is larger than the total capacity of the residual capacity of the second current island and the capacity of the second current unreliable power supply, the second current unreliable power supply is considered to be incapable of being connected with the second current island power supply, then the next second island is acquired as the second current island, and the step of acquiring the power supply in one second current island as the second current island power supply is re-entered.
7. The power distribution network island division method of claim 6 further comprising, after the step of obtaining all the unreliable power sources that are not islanded:
judging whether load nodes which are not marked into islands exist or not;
if so, determining the importance of each load node according to the load quantity of the load node, the total uncontrollable load quantity on the power supply connecting path from the load node to the third island and the total line resistance on the power supply connecting path from the load node to the third island;
And adding the load nodes which are not divided into the islands into the corresponding third islands according to the importance degree and the set importance level in sequence to obtain a fourth island.
8. The power distribution network island division method of claim 7 wherein the determining the importance of each load node based on the load amount of the load node, the total amount of uncontrollable loads on the load node and the power connection paths in the third island, and the total line resistance on the load node and the power connection paths in the third island comprises:
according to the expressionObtaining importance of each load node;
wherein omega i Represents the importance of the ith load node, L i Representing the load quantity of the ith load node, P UL Representing the uncontrollable load on the connection path of the power source and the ith load node in the third island, r i Representing the total line resistance on the i-th load node and the power connection path in the third island.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109120009A (en) * | 2018-09-11 | 2019-01-01 | 国网天津市电力公司电力科学研究院 | The active distribution network fault recovery method that meter and distributed generation resource power output change at random |
| CN112910000A (en) * | 2021-02-03 | 2021-06-04 | 国网福建省电力有限公司宁德供电公司 | Dynamic island division method for power distribution network comprising distributed power supply |
-
2021
- 2021-09-18 CN CN202111096497.8A patent/CN113872237B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109120009A (en) * | 2018-09-11 | 2019-01-01 | 国网天津市电力公司电力科学研究院 | The active distribution network fault recovery method that meter and distributed generation resource power output change at random |
| CN112910000A (en) * | 2021-02-03 | 2021-06-04 | 国网福建省电力有限公司宁德供电公司 | Dynamic island division method for power distribution network comprising distributed power supply |
Non-Patent Citations (3)
| Title |
|---|
| Islanding algorithm for different type of distributed generators in intelligent distribution system;zhu jing 等;2014 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC);第1-5页 * |
| 含光伏电源的配电网故障恢复研究;王荣;中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑(第2期);第19-33页 * |
| 含非可靠分布式电源的配电网孤岛划分;李滨 等;电力系统自动化;第39卷(第8期);第65-71页 * |
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