CN113472003A - Island rapid power recovery method based on network topology authorized orientation - Google Patents

Island rapid power recovery method based on network topology authorized orientation Download PDF

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CN113472003A
CN113472003A CN202110124907.9A CN202110124907A CN113472003A CN 113472003 A CN113472003 A CN 113472003A CN 202110124907 A CN202110124907 A CN 202110124907A CN 113472003 A CN113472003 A CN 113472003A
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fault
power supply
loads
island
power
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陈春
彭宇轩
吴宜桐
曹一家
孙辰昊
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Changsha University of Science and Technology
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
    • Y04S10/52—Outage or fault management, e.g. fault detection or location

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  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an island rapid power restoration method based on network topology authorized orientation. The invention performs directed traversal through network layering, traverses from a fault branch to the tail end direction to determine a non-fault power loss range after a fault occurs, and traverses from a distributed power supply in a non-fault power loss area to the head end direction as a starting point to determine an island recovery range. Through the bidirectional network topology traversal, the island division time is effectively reduced, the power supply of the non-fault power-losing area is recovered more quickly, the load can be recovered to the maximum degree under the condition of fully utilizing the distributed power supply output, and the maximization of the recovery of the non-fault power-losing area is realized.

Description

Island rapid power recovery method based on network topology authorized orientation
Technical Field
The invention relates to the field of power distribution network fault recovery, in particular to an island rapid power recovery method based on network topology authorized orientation.
Background
The construction of the smart grid encourages a large amount of access and full utilization of distributed power supplies so as to reduce environmental pollution and improve power supply reliability. Because the distributed power supply can be used as an independent power supply for power supply, when the power distribution network breaks down, the distributed power supply can form an island system to timely recover the power supply of part of important loads, the power supply reliability of the power distribution network is guaranteed, meanwhile, the distributed power supply can be used as a supplementary power supply and a standby power supply by flexibly switching between a grid-connected operation mode and an island operation mode, and the electric energy provided by the distributed power supply is fully utilized.
The island division of the power distribution network is to solve a group of reasonable splitting points, the existing island division method mainly comprises a mathematical programming method, a heuristic algorithm, an intelligent optimization method and the like, the existing island division processing method is complex in calculation process, most of the existing island division processing methods cannot be optimized, the calculation time is long, and the island division cannot be rapidly completed and the power supply of a non-fault power loss area cannot be recovered.
Due to the outstanding advantages of distributed power supplies, the multi-source access to distribution networks has become a necessary trend. Assuming that after the fault occurs, the distributed power supply in the fault influence domain can be separated from the power grid under the protection action. For a power distribution network system with a distributed power supply, the recovery of a non-fault power loss area after the system isolation fault generally comprises three recovery modes:
1) network reconfiguration mode (recovery of non-faulted power loss zone supply by switching the state of tie and sectionalizer): as shown in fig. 1, a non-fault power loss zone is formed after isolating the fault point a1, and power supply to the non-fault power loss zone can be realized by closing the tie switch K9 or K10.
2) Island recovery mode (recovery of non-fault power loss zone power supply by using distributed power supply and load re-networking): as shown in fig. 1, when B1 fails, the distributed power supply DG2 is provided in the non-failure power loss region, and the distributed power supply in the island can be used to restore the power supply in the non-failure power loss region.
3) Network reconfiguration and island combined mode: as shown in fig. 1, if a point a1 and a point B1 fail simultaneously, the maximization of the recovery of the non-faulty power loss region is achieved by combining network reconfiguration and an isolated island, where the non-faulty power loss region formed by the fault a1 is recovered and isolated by the network reconfiguration, and the non-faulty power loss region formed by the fault B1 is recovered and isolated by the isolated island.
Disclosure of Invention
In order to solve the technical problem, the invention provides a fast and effective power supply recovery method for an island based on network topology authorized orientation.
The technical scheme for solving the problems is as follows: an island rapid power recovery method based on network topology authorized orientation comprises the following steps:
001, dividing a power distribution system network layer;
step 002, determining nodes and branches contained in the non-fault power loss area based on the network hierarchy and fault branch information;
step 003, judging whether the distributed power supply associated with the non-fault power loss area can recover all the loads in the non-fault power loss area to supply power, and if so, merging all the loads in the non-fault power loss area into an island to complete fault recovery; if not, go to step 004;
step 004, traversing to the fault branch in the head end direction by taking the distributed power supply as a starting point, and calculating the load sum sigma S in the traversed communication pathdSum of capacities of distributed power supplies ∑ Sj；
Step 005, compare ∑ SdSum SjIf Σ SjGreater than Σ SdIf so, merging all the loads in the communication path into an island, and recovering all the loads in the communication path to supply power; if Σ SjLess than ∑ SdAnd sorting the loads according to the importance levels, preferentially considering the restoration of the power supply of the loads of the same type, sequentially merging the loads into the island from near to far according to the distance from the loads to the distributed power supply, and restoring the power supply of the power-losing loads.
And 006, connecting the distributed power supplies of the non-fault power loss areas to the grid, and supplying power to the non-fault power loss areas by using the distributed power supplies to complete fault recovery.
In the island fast power restoration method based on the network topology authorized orientation, in the step 001, the power distribution system hierarchy is divided, and the division of the hierarchy includes the following steps:
the method comprises the steps that a feeder line outgoing bus is used as a first-layer node, the outermost layer is a tip node, the parent-child relationship of the nodes is sequentially constructed, the node of the previous layer is a parent node of the next layer, the node of the next layer is a child node of the previous layer, each child node is only provided with one parent node, and each parent node corresponds to a plurality of child nodes; forming a network level matrix L and a branch level incidence matrix C according to the parent-child relationship of the nodes;
in the above island fast power restoration method based on network topology authorized orientation, the step 002 includes:
according to the obtained network hierarchical relationship, traversing from the fault branch Bi to the tail end branch direction, searching the lower branches of any other branches except the last branch through the branch hierarchical incidence matrix C, and determining the traversing direction until traversing the tail end node, thereby determining the branch and the node contained in the non-fault power failure area.
In the island fast power restoration method based on network topology authorized orientation, the specific steps of step 003 are as follows:
comparing the current I flowing into the non-fault loss zone before faultiAnd the sum I of currents of all distributed power supplies in the non-fault power loss area for supplying power to the loadG. If IGIs greater than IiIf the capacity of the distributed power supply associated with the non-fault power loss area is enough to recover all load power supply of the non-fault power loss area; if IGIs less than IiIf the voltage of the distributed power supply associated with the non-fault power loss area cannot recover all load power supplies in the non-fault power loss area, the island range needs to be further determined through reverse traversal of the step 004.
In the above island fast power restoration method based on network topology authorized orientation, the specific steps of step 004 are as follows:
and continuously traversing to the fault branch in the direction of the head end by using the network topology hierarchical relationship determined by the network hierarchical matrix L and the branch hierarchical incidence matrix C and taking the distributed power supply in the non-fault power loss area as a starting point to obtain a trunk path for recovering the island.
The island fast power restoration method based on the network topology authorized orientation includes the specific steps of 005:
comparing the sum of the loads in the trunk path ∑ SjSum of distributed power supply capacities ∑ Sd. If it isSum of loads in trunk path ∑ SjLess than sum of distributed power supply capacities ∑ SdThen the distributed power supply can recover all loads in the main path; if the sum of the loads in the trunk path ∑ SjGreater than sum of distributed power supply capacities ∑ SdIf the distributed power supply cannot recover all the loads in the main path, the power supply of one type of load needs to be recovered according to the priority of the importance level, then the second type and the third type of loads are recovered, and the loads are sequentially merged into an island from near to far according to the distance from the loads to the distributed power supply, so that the power supply of the power-off load is recovered.
The invention has the beneficial effects that:
1. according to the method, after a fault occurs, a non-fault power loss range is determined by traversing from a fault branch to the tail end direction, then traversing from a distributed power supply in a non-fault power loss area to the head end direction, and rapidly determining an island recovery range by bidirectional traversing.
2. The invention converts the optimization problem of the existing island division into a directional traversal problem, effectively reduces the computation complexity of the island division of the non-fault power-loss area through bidirectional traversal, more quickly determines the island range, simultaneously considers the rapidity and the optimality of a recovery scheme, maximally recovers the load under the condition of fully utilizing the output of a distributed power supply, and realizes the maximization of the recovery of the non-fault power-loss area.
Drawings
Fig. 1 is a schematic diagram illustrating an island recovery mode of a power distribution network according to the present invention.
Fig. 2 is a schematic diagram of islanding of a radial 21-node power distribution network in the invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, a method for quickly recovering power supply of an island based on a network topology authorized orientation includes the following steps:
and 001, dividing the power distribution system level.
The method comprises the steps that a feeder line outgoing bus is used as a first-layer node, the outermost layer is a terminal node, the parent-child relationship of the nodes is sequentially constructed, the node of the previous layer is a parent node of the next layer, the node of the next layer is a child node of the previous layer, each child node is provided with only one parent node, and each parent node corresponds to a plurality of child nodes; and forming a network level matrix L and a branch level incidence matrix C according to the parent-child relationship of the nodes.
For example, as shown in fig. 2, the first level node, the feeder outlet bus, starts at bus 0. Simple examples are: defining a network level matrix L ═ (L)ij)H×RWherein H is the number of layers of the radiation system, and R is the maximum value of the number of branches contained in each layer. Element L of network level matrix LijWhen L is presentijWhen not equal to 0, it is denoted as a branch number in the power distribution system. In the system shown in fig. 2, H is 10 and R is 3, it can be seen from the network hierarchy matrix L that branch 1 is at the first level, branches 2 and 10 are at the second level, and branches 7, 14 and 19 are at the seventh level. L is:
Figure RE-GDA0003217830490000051
branch level incidence matrix C ═ (C)rs)T×TElement C of the branch level incidence matrix CrsWhen C is presentrsWhen the number is 1, it means that the branch at the previous layer of the r-th branch is the branch s, where r and s are the branch numbers of the topology (the branch numbers are numbered from 1).
The upper and lower layer relations of each branch can be directly seen through the branch level incidence matrix Crs0 then means that there is no upper and lower layer relationship between the two branches, C rs1 represents the upper branch of the branch r as the branch s.
Step 002, determining nodes and branches contained in the non-fault power loss area based on the network hierarchy and fault branch information;
after the power distribution system breaks down, the fault branch is isolated, the fault branch is used as a starting point, the topological hierarchical relation defined in the network hierarchical matrix L is utilized, traversal is started from the fault branch Bi to the tail end branch, the lower layer branches of any other branches except the last layer can be searched through the branch hierarchical incidence matrix C, the traversal direction is determined until the tail end node is traversed, and the branch and the node contained in the non-fault power failure area are determined.
For example, as shown in FIG. 2, if the branch 5 fails, traversing from the branch 5 to the end direction, and determining that the non-failure power loss area includes the nodes 5 to 9 and 14 to 21 and the branches 6 to 9 and 14 to 21.
Step 003, judging whether the distributed power supply associated with the non-fault power loss area can recover all the loads in the non-fault power loss area to supply power, and if so, merging all the loads in the non-fault power loss area into an island to complete fault recovery; if not, go to step 004;
calculation of IiAnd IGIn which IiFor current flowing into non-faulted zones before fault, IGAnd the sum of the currents for supplying the loads by all the distributed power supplies in the non-fault power loss area is obtained.
Figure RE-GDA0003217830490000061
Comparison IiAnd IGSize of (A), if IGIs greater than IiIf so, the distributed power supply associated with the non-fault power loss area can recover all load power supply of the non-fault power loss area; if IGIs less than IiIf the power supply of all the loads in the non-fault power loss area cannot be recovered, the island range needs to be further determined through reverse traversal in the step 004.
Step 004, traversing to the fault branch in the head end direction by taking the distributed power supply as a starting point, and calculating the load sum sigma S in the traversed communication pathdSum of capacities of distributed power supplies ∑ Sj；
By using the topological hierarchical relation defined in the network hierarchical matrix L, the upper layer branch of any other branch except the first layer can be searched through the branch hierarchical incidence matrix C, and the distributed power supply in the non-fault power failure area is taken as a starting point and continuously traversed towards the head end direction until the fault branch obtains a communication path.
For example, in fig. 2, when the branch 5 fails, the distributed power sources associated with the non-failure power loss areas are DG1 and DG2, which respectively start from DG1 and DG2 and continuously traverse in the head-end direction until the failed branch 5, and a communication path including branches 6, 14, 15, 18, and 19 is obtained.
Calculating the sum of the loads S in the traversed communication pathdSum of capacities of distributed power supplies ∑ Sj。
Step 005, compare ∑ SdSum SjIf the sum of the loads is ∑ SjLess than sum of distributed power supply capacities ∑ SdIf so, merging all the loads in the communication path into an island, and recovering all the loads in the communication path to supply power; if the sum of the loads is ∑ SjGreater than sum of distributed power supply capacities ∑ SdAnd firstly considering to recover the power supply of the first class of load according to the importance level, then recovering the second and third classes of loads, and sequentially merging the loads into the island from near to far according to the distance from the loads to the distributed power supply to recover the power supply of the power-losing load.
And 006, connecting the distributed power supplies of the non-fault power loss areas to the grid, and supplying power to the non-fault power loss areas by using the distributed power supplies to complete fault recovery.

Claims (6)

1. An island rapid power recovery method based on network topology authorized orientation comprises the following steps:
001, dividing a power distribution system network layer;
step 002, determining nodes and branches contained in the non-fault power loss area based on the network hierarchy and fault branch information;
step 003, judging whether the distributed power supply associated with the non-fault power loss area can recover all the loads in the non-fault power loss area to supply power, and if so, merging all the loads in the non-fault power loss area into an island to complete fault recovery; if not, go to step 004;
step 004, traversing to the fault branch in the head end direction by taking the distributed power supply as a starting point, and calculating the load sum sigma S in the traversed communication pathdSum of capacities of distributed power supplies ∑ Sj；
Step 005, compare ∑ SdSum SjIf Σ SjGreater than Σ SdThen the communication path will be connectedAll the loads in the communication path are merged into an island, and the power supply of all the loads in the communication path is recovered; if Σ SjLess than ∑ SdAnd sorting the loads according to the importance levels, preferentially considering the restoration of the power supply of the loads of the same type, sequentially merging the loads into the island from near to far according to the distance from the loads to the distributed power supply, and restoring the power supply of the power-losing loads.
And 006, connecting the distributed power supplies of the non-fault power loss areas to the grid, and supplying power to the non-fault power loss areas by using the distributed power supplies to complete fault recovery.
2. The method according to claim 1, wherein in the step 001, a power distribution system network hierarchy is divided, and the division of the network hierarchy includes the following steps:
the method comprises the steps that a feeder line outgoing bus is used as a first-layer node, the outermost layer is a tip node, the parent-child relationship of the nodes is sequentially constructed, the node of the previous layer is a parent node of the next layer, the node of the next layer is a child node of the previous layer, each child node is only provided with one parent node, and each parent node corresponds to a plurality of child nodes; and forming a network level matrix L and a branch level incidence matrix C according to the parent-child relationship of the nodes.
3. The method for rapidly recovering power supply to an island based on the network topology authorized orientation according to claim 1, wherein the step 002 comprises the following specific steps:
according to the obtained network hierarchical relationship, traversing from the fault branch Bi to the tail end branch direction, searching the lower branches of any other branches except the last branch through the branch hierarchical incidence matrix C, and determining the traversing direction until traversing the tail end node, thereby determining the branch and the node contained in the non-fault power failure area.
4. The method for rapidly recovering the power supply of the island based on the network topology authorized orientation according to claim 1, wherein the step 003 comprises the following steps:
comparing the current flowing into the non-fault power-loss area before faultCurrent of (I)iAnd the sum I of currents of all distributed power supplies in the non-fault power loss area for supplying power to the loadGIf I isGIs greater than IiIf the capacity of the distributed power supply associated with the non-fault power loss area is enough to recover all load power supply of the non-fault power loss area; if IGIs less than IiIf the voltage of the distributed power supply associated with the non-fault power loss area cannot recover all load power supplies in the non-fault power loss area, the island range needs to be further determined through reverse traversal of the step 004.
5. The method for rapidly recovering the power supply of the island based on the network topology authorized orientation according to claim 1, wherein the step 004 comprises the following steps:
and continuously traversing to the fault branch in the direction of the head end by using the network topology hierarchical relationship determined by the network hierarchical matrix L and the branch hierarchical incidence matrix C and taking the distributed power supply in the non-fault power loss area as a starting point to obtain a trunk path for recovering the island.
6. The method for rapidly recovering the power supply of the island based on the network topology authorized orientation according to claim 1, wherein the step 005 comprises the following specific steps:
comparing the sum of the loads in the trunk path ∑ SjSum of distributed power supply capacities ∑ SdIf the sum of the loads in the trunk path ∑ SjLess than sum of distributed power supply capacities ∑ SdThen the distributed power supply can recover all loads in the main path; if the sum of the loads in the trunk path ∑ SjGreater than sum of distributed power supply capacities ∑ SdIf the distributed power supply cannot recover all the loads in the main path, the power supply of one type of load needs to be recovered according to the priority of the importance level, then the second type and the third type of loads are recovered, and the loads are sequentially merged into an island from near to far according to the distance from the loads to the distributed power supply, so that the power supply of the power-off load is recovered.
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