CN115149526A - Automatic power supply recovery method for distributed feeder during planned island of active power distribution network - Google Patents

Automatic power supply recovery method for distributed feeder during planned island of active power distribution network Download PDF

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Publication number
CN115149526A
CN115149526A CN202210935585.0A CN202210935585A CN115149526A CN 115149526 A CN115149526 A CN 115149526A CN 202210935585 A CN202210935585 A CN 202210935585A CN 115149526 A CN115149526 A CN 115149526A
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node
switch
load
nodes
dynamic
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CN115149526B (en
Inventor
蔡伟程
王璇
李晔
莫骏
王豫
何天文
蒲华
冯林浩
杨书佺
孙司予
杨雄
黄立纯
张冰
成涛
邹雪俐
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Sichuan Electric Power Design and Consulting Co Ltd
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Sichuan Electric Power Design and Consulting Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
    • H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention relates to an active power distribution network feeder automation technology. The invention provides a distributed feeder automation power supply recovery method for an active power distribution network planned island, aiming at solving the problem that the traditional power distribution network feeder automation system and the power supply recovery method can not be directly used under the active power distribution network island operation condition, and the technical scheme can be summarized as follows: overcurrent detection elements are respectively arranged in a 10kV outgoing switch of a transformer substation and intelligent terminal units of each group of ring networks, an upstream and downstream relation information table and a short-circuit current criterion of each line are prestored in each node, the nodes automatically judge line faults, DG nodes, contact switch nodes and the like are automatically searched after the line faults, planned isolated island operation is started, and the contact switch nodes at the downstream of each fault section automatically recover the nodes capable of being recovered. The method has the advantages of automatic processing, adaptability to the active power distribution network of the distributed feeder line with the planned isolated island and suitability for the active power distribution network of the distributed feeder line.

Description

Automatic power supply recovery method for distributed feeder during planned island of active power distribution network
Technical Field
The invention relates to an active power distribution network feeder automation technology, in particular to a distributed feeder automation power supply recovery method when an active power distribution network is in a planned isolated island.
Background
The fault recovery is an important component of the fault processing process of the power distribution network, and plays a vital role in improving the power supply reliability of the power distribution network.
At present, the fault recovery of the power distribution network mostly adopts a centralized control mode, a master station central processing unit is arranged to upload information such as local switch states and electric quantities acquired by each power distribution network terminal device to the master station, the master station carries out fault recovery optimization decision, specific fault recovery schemes are formulated, and switch action instructions are issued to each terminal. The centralized control mode depends on the master station, the requirement on a communication system is high, and with the increasing complexity of a distribution network structure, the mode has the defects of large calculated amount, long fault recovery time and the like.
In recent years, with the increasing distributed power Generation technology, distributed Generation (DG) is largely connected to a power Distribution network, so that the power Distribution network is changed from a single power supply network to a multi-source network, a tidal current direction is also changed from unidirectional flow to bidirectional flow, a topological structure of the network and an operation mode of the system are greatly changed, and the safety and stability of the power Distribution network are seriously influenced by the islanding operation of the DG. The traditional power distribution network feeder automation system and the power supply recovery method cannot be directly applied to an active power distribution network under the island operation condition, and a new feeder automation system and a new power supply recovery method which are applied to the active power distribution network under the island operation condition are urgently needed to be found.
Disclosure of Invention
The invention aims to solve the problem that a traditional power distribution network feeder automation system and a power supply recovery method cannot be directly used under the existing active power distribution network island operation condition, and provides a distributed feeder automation power supply recovery method for an active power distribution network planned island.
The technical scheme adopted by the invention for solving the technical problems is that the distributed feeder automatic power supply recovery method when the active power distribution network is in a planned isolated island is applied to a distributed feeder automatic system, the distributed feeder automatic system comprises a transformer substation 10kV outgoing switch and intelligent terminal units of multiple groups of ring networks, the intelligent terminal units of the ring networks comprise connecting switches, the transformer substation 10kV outgoing switch and the intelligent terminal units of the ring networks respectively comprise overcurrent detection elements, the overcurrent detection elements are used for detecting current information flowing through the connecting switches and the on-off states of the switches, the transformer substation 10kV outgoing switch and the intelligent terminal units of the ring networks form an upstream-downstream relationship according to the corresponding active power distribution network, each transformer substation 10kV outgoing switch and the intelligent terminal unit of each group of ring networks respectively serve as a node, and the method comprises the following processing steps aiming at any node:
step 1, prestoring an upstream and downstream relation information table and each line short-circuit current criterion, wherein the upstream and downstream relation information table at least comprises a local node name, a local node address, an adjacent node name, an adjacent node address, an upstream and downstream relation between the local node and the adjacent node, a local node connecting switch name, whether a local node connecting switch is closed, an adjacent node connecting switch name, whether an adjacent node connecting switch is closed, whether the local node is a power supply node, whether the local node is a DG node, whether the local node is a contact switch node, whether the local node plans a node in an island/whether the island operates, whether the local node is an island planning boundary node/other planning boundary island boundary node addresses, whether the local node is a terminal load node and a branch line grade;
step 2, regularly judging whether each line has a fault according to prestored short-circuit current criteria of each line, if so, entering step 3, otherwise, not processing, wherein the line refers to a line from a connection switch connected with the node and an adjacent downstream node to a connection switch connected with the node, and the regularly judging whether each line has a fault according to prestored short-circuit current criteria of each line specifically comprises the following steps: aiming at any line, acquiring the current value of a connecting switch connected with a corresponding adjacent downstream node in real time according to a pre-stored upstream and downstream relation information table to serve as the upstream switch current value of the line, sending acquired current value information to a corresponding adjacent downstream node according to the pre-stored upstream and downstream relation information table, acquiring the current value of the connecting switch connected with the node in real time to serve as the downstream switch current value of the line, comparing the upstream switch current value of the line with the downstream switch current value of the line, and judging whether each line has a fault according to a pre-stored short circuit current criterion;
step 3, the node disconnects the connection switch on the line, sends a disconnection notice to the adjacent node corresponding to the line, and removes the fault;
step 4, if the node receives a disconnection notification sent by an upstream node, controlling a connection switch connected with the upstream node to be disconnected, meanwhile, judging whether the node is a DG node or an end load node or a tie switch node according to an upstream and downstream relation information table, if the node is the DG node or the end load node or the tie switch node, marking the node as the DG node or the end load node or the tie switch node at the downstream of the fault section, otherwise, not processing, then sending a search instruction to each downstream node adjacent to the node according to the upstream and downstream relation information table, receiving feedback information of the downstream node, further searching each DG node, the end load node and the tie switch node at the downstream of the fault section, and entering step 5;
step 5, judging whether the fault section is in a planned island or not according to the upstream and downstream relation information table, if not, informing the boundary switches of the planned islands corresponding to the DG nodes at the downstream of the searched fault section to be immediately switched off to form the planned island, and if the fault section is in the planned island, informing the boundary switches of the planned islands corresponding to the DG nodes at the downstream of other fault sections except the planned island corresponding to the fault section to be immediately switched off to form the planned island;
step 6, if the node receives a search instruction sent by an upstream node, judging whether the node is a DG node or an end load node or a contact switch node, if the node is the DG node or the end load node or the contact switch node, marking the node as the DG node or the end load node or the contact switch node at the downstream of the fault section, and simultaneously feeding back the node to the upstream node, otherwise, sending the search instruction to each downstream node adjacent to the node according to an upstream and downstream relation information table, receiving feedback information of the downstream node, and forwarding the feedback information to the upstream node according to the corresponding search instruction;
step 7, if the node is a contact switch node and is marked as a contact switch node at the downstream of a fault section, the node sends available residual capacity to an adjacent upstream node sending a search instruction, receives a local contact switch node restorable load node dynamic recording table fed back by the upstream node, notifies a node recorded last on the node and a recorded downstream node adjacent to the node according to the local contact switch node restorable load node dynamic recording table, disconnects a connecting switch connected between the node and the node, notifies a recorded node which is not traversed and a recorded node adjacent to the node which is not traversed, disconnects the connecting switch connected between the node and the node, and notifies a node corresponding to a boundary switch of a recorded planned island to close the boundary switch of the planned island if the boundary switch of the planned island is recorded on the node, finishes planned island operation, and closes the connecting switch connected between the node and the adjacent upstream node sending the search instruction after the notification is finished;
step 8, if the node receives the available residual capacity sent by the contact switch node, generating and filling a dynamic recording table of the recoverable load node of the contact switch node, judging whether the available residual capacity is enough to recover the load of the node, if so, selecting an adjacent node with the lowest branch line grade of the node and other adjacent nodes except the contact switch node, forwarding the dynamic recording table of the recoverable load node of the contact switch node to the adjacent node, and otherwise, feeding back the dynamic recording table of the recoverable load node of the contact switch node to the contact switch node; the contact switch node restorable load node dynamic recording table at least comprises a contact switch node name, a searched node name, a corresponding node load, an available residual capacity dynamic value after deducting the corresponding node load and whether a corresponding node branch line traverses or not;
step 9, if the node receives a dynamic record table of a recoverable load node of a contact switch node sent by an adjacent node, judging whether the name of the node is recorded in the dynamic record table of the recoverable load node of the contact switch node, if so, entering step 10, otherwise, filling the name of the node in the dynamic record table of the recoverable load node of the contact switch node, and entering step 11;
step 10, selecting an adjacent node with the lowest branch line grade from branch lines which are not traversed by the node, if no other branch lines which are not traversed exist in the adjacent node, marking whether the node branch line corresponding to the node is traversed or not in the dynamic record table of the recoverable load node of the contact switch node as traversed, and simultaneously forwarding the dynamic record table of the recoverable load node of the contact switch node to the adjacent node, otherwise, directly forwarding the dynamic record table of the recoverable load node of the contact switch node to the adjacent node;
step 11, judging whether the node is a node in a planned island, if so, recording that the load of the node is 0 in a dynamic recording table of a contact switch node recoverable load node, and entering step 14, otherwise, entering step 12;
step 12, recording the load of the node and the dynamic value of the available residual capacity after deducting the load of the corresponding node in the dynamic recording table of the recoverable load node of the contact switch node, and simultaneously judging whether the dynamic value of the available residual capacity after deducting the load of the corresponding node is a negative number, if so, returning the dynamic recording table of the recoverable load node of the contact switch node to the contact switch node, otherwise, entering step 13;
step 13, selecting an adjacent node with the lowest branch line grade, connected with other unrecorded adjacent nodes in the dynamic recording table of the interconnection switch node recoverable load node, of the local node, if the adjacent node has no other adjacent node unrecorded in the dynamic recording table of the interconnection switch node recoverable load node, then marking whether a branch line of the node corresponding to the local node traverses the dynamic recording table of the interconnection switch node recoverable load node as traversed, and simultaneously forwarding the dynamic recording table of the interconnection switch node recoverable load node to the adjacent node, otherwise, marking whether a branch line of the node corresponding to the local node traverses the dynamic recording table of the interconnection switch node recoverable load node as not traversed, and meanwhile forwarding the dynamic recording table of the interconnection switch node recoverable load node to the adjacent node, if the local node is only connected with the node sending the dynamic recording table of the interconnection switch node recoverable load node, then marking whether a branch line of the node corresponding to the dynamic recording table of the interconnection switch node corresponding to the local node as traversed, and if the branch line of the interconnection switch node corresponding to the dynamic recording table of the interconnection switch node recoverable load node returns the traversed to the node, and marking whether the branch line of the node corresponding to the dynamic recording table of the interconnection switch node as traversed, and if the branch line of the node of the interconnection switch node does not exist in the dynamic recording table of the interconnection switch node;
step 14, judging whether the node is connected with a node on the assigned planned island and other adjacent nodes exist, if so, marking whether a node branch line corresponding to the node is traversed and not traversed in the dynamic record table of the contact switch node recoverable load node, entering step 15, otherwise, marking whether the node branch line corresponding to the node is traversed and is already traversed in the dynamic record table of the contact switch node recoverable load node, and entering step 15;
step 15, judging whether all node names on a planned island to which the node belongs are recorded in the dynamic recording table of the recoverable load node of the tie switch node, if so, entering step 16, otherwise, forwarding the dynamic recording table of the recoverable load node of the tie switch node to any other node in the planned island which is not recorded in the dynamic recording table of the recoverable load node of the tie switch node;
step 16, judging whether each node of the plan island in the dynamic record table of the contact switch node recoverable load node has a node marked as not traversed, if so, entering step 17, otherwise, sending the dynamic record table of the contact switch node recoverable load node to a node marked as not traversed by a corresponding node branch line which is recorded recently in the dynamic record table of the contact switch node recoverable load node, and if not, returning the dynamic record table of the contact switch node recoverable load node to the contact switch node;
and step 17, obtaining branch line grades of all nodes marked as not traversed on the planned island and other unrecorded adjacent nodes in the dynamic record table of the interconnection switch node recoverable load nodes, selecting the unrecorded node corresponding to the lowest branch line grade, if other adjacent nodes of the adjacent nodes in the planned island connected with the unrecorded node are recorded in the dynamic record table of the interconnection switch node recoverable load nodes, marking whether the node branch lines corresponding to the nodes in the planned island are traversed or not in the dynamic record table of the interconnection switch node recoverable load nodes as traversed, and sending the dynamic record table of the interconnection switch node recoverable load nodes to the unrecorded nodes.
Specifically, to explain how to obtain branch line grades of all nodes marked as not traversed on the planned island and other unrecorded neighboring nodes in the dynamic record table of the interconnection switch node recoverable load node, in step 17, the method for obtaining branch line grades of all nodes marked as not traversed on the planned island and other unrecorded neighboring nodes in the dynamic record table of the interconnection switch node recoverable load node is: the node sends and acquires an upstream and downstream relation information table to all nodes marked as non-traversed on the planned island, acquires the upstream and downstream relation information table of each corresponding node, and acquires branch line grades of all the nodes marked as non-traversed on the planned island and other non-recorded adjacent nodes in the dynamic record table of the interconnection switch node recoverable load node according to the upstream and downstream relation information tables.
Further, since some nodes have more than two adjacent nodes, it is possible to receive a plurality of tie switch nodes to recover the load node dynamic record table, and in order to avoid an error in calculating the residual capacity dynamic value, step 9 specifically includes:
step 901, if the node receives a dynamic record table of a recoverable load node of a contact switch node sent by an adjacent node, judging whether the node has received a dynamic record table of a recoverable load node of other contact switch nodes, if so, entering step 902, otherwise, entering step 903;
step 902, judging whether the available residual capacity dynamic value corresponding to the node in the other contact switch node recoverable load node dynamic record table is a positive number, if not, entering step 903, if so, sending the currently received contact switch node recoverable load node dynamic record table to a node which is recorded most recently in the contact switch node recoverable load node dynamic record table and is marked as not traversed, and if not, returning the currently received contact switch node recoverable load node dynamic record table to the corresponding contact switch node; (ii) a
Step 903, judging whether the node name is recorded in the currently received dynamic recording table of the contact switch node recoverable load node, if so, entering step 10, otherwise, filling the node name in the dynamic recording table of the contact switch node recoverable load node, and entering step 11.
The distributed feeder automation power supply recovery method has the advantages that in the scheme of the invention, by the distributed feeder automation power supply recovery method when the active power distribution network planned isolated island occurs, the fault section can be automatically and quickly judged when a fault occurs, the power supply of the fault section and the downstream of the fault section is cut off, meanwhile, if the planned isolated island exists, the planned isolated island is formed and independently operated, the power supply in the planned isolated island is ensured to the maximum extent, each contact switch node can automatically recover part or all nodes to supply power according to the condition, the distributed feeder automation power supply recovery method can be suitable for a feeder automation system and a power supply recovery method in the active power distribution network under the isolated island operation condition, the scheme can automatically operate only after the initial configuration is completed, and the manual workload is reduced.
Drawings
Fig. 1 is a processing flow chart of each node during fault judgment in the method for recovering automatic power supply of distributed feeder when an active power distribution network has a planned island according to the present invention;
fig. 2 is a processing flow diagram of each node in an automatic recovery stage after a fault in the automatic power supply recovery method for a distributed feeder when an active power distribution network has a planned island according to the present invention;
fig. 3 is a schematic diagram of active power distribution network networking in an embodiment of the present invention.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the embodiments and the accompanying drawings.
The invention relates to a distributed feeder automatic power supply recovery method when an active power distribution network is in a planned isolated island, which is applied to a distributed feeder automatic system, wherein the distributed feeder automatic system comprises a transformer substation 10kV outgoing switch and multiple groups of intelligent terminal units of looped networks, the intelligent terminal units of the looped networks comprise connecting switches, the transformer substation 10kV outgoing switch and the intelligent terminal units of the looped networks respectively comprise overcurrent detection elements, the overcurrent detection elements are used for detecting current information flowing through the connecting switches and the on-off state of the switches, the transformer substation 10kV outgoing switch and the intelligent terminal units of the looped networks form an upstream-downstream relationship according to the corresponding active power distribution network groups, each transformer substation 10kV outgoing switch and the intelligent terminal unit of each looped network group are respectively used as a node, the processing flow chart during fault judgment of any node is shown in fig. 1, and the processing flow chart during the automatic recovery stage after the fault is shown in fig. 2, and specifically comprises the following processing steps:
step 1, prestoring an upstream and downstream relation information table and each line short-circuit current criterion, wherein the upstream and downstream relation information table at least comprises a local node name, a local node address, an adjacent node name, an adjacent node address, an upstream and downstream relation between the local node and the adjacent node, a local node connecting switch name, whether a local node connecting switch is closed, an adjacent node connecting switch name, whether an adjacent node connecting switch is closed, whether the local node is a power supply node, whether the local node is a DG node, whether the local node is a contact switch node, whether the local node plans nodes in an island/whether island operation is performed, whether the local node is an island planning boundary node/other planning boundary node addresses (whether the local node is a planning island boundary node/other planning island boundary nodes refers to whether the local node is a planning island boundary node, and when the local node is a planning island boundary node, the addresses of other planning island boundary nodes in the island plan are recorded), whether the local node is an end load node and a branch line grade.
Step 2, regularly judging whether each line has a fault according to the pre-stored short-circuit current criterion of each line, if so, entering step 3, otherwise, not processing, wherein the line refers to a line from a connecting switch connected with the node and an adjacent downstream node to a connecting switch connected with the node, and the regularly judging whether each line has a fault according to the pre-stored short-circuit current criterion of each line specifically comprises the following steps: aiming at any line, acquiring the current value of a connecting switch connected with a corresponding adjacent downstream node in real time according to a pre-stored upstream and downstream relation information table to serve as the upstream switch current value of the line, sending acquired current value information to a corresponding adjacent downstream node according to the pre-stored upstream and downstream relation information table, acquiring the current value of the connecting switch connected with the node in real time to serve as the downstream switch current value of the line, comparing the upstream switch current value of the line with the downstream switch current value of the line, and judging whether each line has a fault according to a pre-stored short circuit current criterion.
In the scheme, the current comparison at two ends of the line is used as a fault section positioning principle, so that the positioning precision is high, the reliability is high, and the real-time performance, the sensitivity and the selectivity are high due to the fact that each node is judged in real time by itself.
And 3, disconnecting the connection switch on the line by the node, sending a disconnection notice to the adjacent node corresponding to the line, and removing the fault.
And 4, if the node receives a disconnection notification sent by the upstream node, controlling a connection switch connected with the upstream node to be disconnected, meanwhile, judging whether the node is a DG node or an end load node or a tie switch node according to the upstream and downstream relation information table, if the node is the DG node or the end load node or the tie switch node, marking the node as the DG node or the end load node or the tie switch node at the downstream of the fault section, otherwise, not processing, then sending a search instruction to each downstream node adjacent to the node according to the upstream and downstream relation information table, receiving feedback information of the downstream node, further searching each DG node, the end load node and the tie switch node at the downstream of the fault section, and entering the step 5. At this time, if it is found that the downstream of the faulty section is not connected to the switching node, it indicates that the downstream node of the faulty section is in the end load branch or the DG branch, and there is no need to restore the load.
And 5, judging whether the fault section is in the planned island or not according to the upstream and downstream relation information table, if not, informing the boundary switches of the planned islands corresponding to the DG nodes at the downstream of the searched fault section to be immediately disconnected to form the planned island, and if so, informing the boundary switches of the planned islands corresponding to the DG nodes at the downstream of the other fault sections except the planned island corresponding to the fault section to be immediately disconnected to form the planned island.
And 6, if the node receives a search instruction sent by the upstream node, judging whether the node is a DG node or an end load node or a contact switch node, if the node is the DG node or the end load node or the contact switch node, marking the node as the DG node or the end load node or the contact switch node at the downstream of the fault section, and simultaneously feeding back the node to the upstream node, otherwise, sending the search instruction to each downstream node adjacent to the node according to an upstream and downstream relation information table, receiving feedback information of the downstream node, and forwarding the feedback information to the upstream node according to the corresponding search instruction.
And 7, if the node is a contact switch node and is marked as a contact switch node at the downstream of the fault section, the node sends the available residual capacity to an adjacent upstream node sending a search instruction, receives a local contact switch node restorable load node dynamic recording table fed back by the upstream node, notifies a node recorded last on the node and a recorded downstream node adjacent to the node according to the local contact switch node restorable load node dynamic recording table, disconnects a connecting switch connected between the node and the node, notifies a recorded node which is not traversed and a recorded node adjacent to the node which is not traversed, disconnects the connecting switch connected between the node and the node, and notifies a node corresponding to a boundary switch of a recorded planned island to close the boundary switch of the planned island if the boundary switch of the planned island is recorded on the node, finishes the operation of the planned island, and closes the connecting switch connected between the node and the adjacent upstream node sending the search instruction after the notification is finished.
Here, generally, there may be two or more adjacent upstream nodes in the tie switch node, but the plurality of adjacent upstream nodes are not always located downstream of the fault section, and if they are located downstream of the fault section, the tie switch node transmits the available remaining capacity to the adjacent upstream node when receiving the search instruction transmitted by which adjacent upstream node first, in which case the problem that the tie switch node transmits the available remaining capacity to which adjacent upstream node when the plurality of adjacent upstream nodes are located downstream of the fault section can be solved, and if the search instructions transmitted by the two or more adjacent upstream nodes are received at the same time, the available remaining capacity can be transmitted to one of the adjacent upstream nodes in a random selection manner.
Step 8, if the node receives the available residual capacity sent by the contact switch node, generating and filling a dynamic recording table of the recoverable load node of the contact switch node, judging whether the available residual capacity is enough to recover the load of the node, if so, selecting an adjacent node with the lowest branch line grade of the node and other adjacent nodes except the contact switch node, forwarding the dynamic recording table of the recoverable load node of the contact switch node to the adjacent node, and otherwise, feeding back the dynamic recording table of the recoverable load node of the contact switch node to the contact switch node; the dynamic recording table of the contact switch node recoverable load node at least comprises the name of the contact switch node, the searched node name, the corresponding node load, the dynamic value of the available residual capacity after deducting the corresponding node load and whether the corresponding node branch line traverses or not.
And 9, if the node receives a dynamic record table of a recoverable load node of a contact switch node sent by an adjacent node, judging whether the name of the node is recorded in the dynamic record table of the recoverable load node of the contact switch node, if so, entering the step 10, otherwise, filling the name of the node in the dynamic record table of the recoverable load node of the contact switch node, and entering the step 11.
Since some nodes have more than two adjacent nodes, it is possible to receive a plurality of tie switch nodes to restore the dynamic record table of the load node, and in order to avoid an error in calculating the dynamic value of the remaining capacity, step 9 may specifically be:
step 901, if the node receives a dynamic recording table of a recoverable load node of a contact switch node sent by an adjacent node, judging whether the node has received a dynamic recording table of a recoverable load node of other contact switch nodes, if so, entering step 902, otherwise, entering step 903;
step 902, judging whether the available residual capacity dynamic value corresponding to the node in the other contact switch node recoverable load node dynamic record table is a positive number, if not, entering step 903, if so, sending the currently received contact switch node recoverable load node dynamic record table to a node which is recorded most recently in the contact switch node recoverable load node dynamic record table and is marked as not traversed, and if not, returning the currently received contact switch node recoverable load node dynamic record table to the corresponding contact switch node; (ii) a
Step 903, judging whether the node name is recorded in the currently received dynamic recording table of the contact switch node recoverable load node, if so, entering step 10, otherwise, filling the node name in the dynamic recording table of the contact switch node recoverable load node, and entering step 11.
And step 10, selecting an adjacent node with the lowest branch line grade from the branch lines which are not traversed by the node, if no other branch line which is not traversed exists in the adjacent node, marking whether the node branch line corresponding to the node is traversed or not in the dynamic record table of the recoverable load node of the contact switch node as traversed, and simultaneously forwarding the dynamic record table of the recoverable load node of the contact switch node to the adjacent node, otherwise, directly forwarding the dynamic record table of the recoverable load node of the contact switch node to the adjacent node.
And 11, judging whether the node is a node in a planned island, recording that the load of the node is 0 in a dynamic recording table of the interconnection switch node recoverable load node if the node is the node in the planned island, and entering a step 14, otherwise entering a step 12.
And step 12, recording the load of the node and the dynamic value of the available residual capacity after deducting the load of the corresponding node in the dynamic recording table of the recoverable load node of the contact switch node, simultaneously judging whether the dynamic value of the available residual capacity after deducting the load of the corresponding node is a negative number, if so, returning the dynamic recording table of the recoverable load node of the contact switch node to the contact switch node, otherwise, entering step 13.
Step 13, selecting the neighboring node with the lowest branch line grade, which is connected with the other neighboring nodes that are not recorded in the dynamic record table of the recoverable load node of the contact switch node, of the local node, if no other neighboring node that is not recorded in the dynamic record table of the recoverable load node of the contact switch node exists except the neighboring node, then marking whether the branch line of the node corresponding to the local node traverses the dynamic record table of the recoverable load node of the contact switch node as traversed, and simultaneously forwarding the dynamic record table of the recoverable load node of the contact switch node to the neighboring node, otherwise marking whether the branch line of the node corresponding to the local node traverses the dynamic record table of the recoverable load node of the contact switch node as not traversed in the dynamic record table of the recoverable load node of the contact switch node, and meanwhile forwarding the dynamic record table of the load node of the contact switch node to the neighboring node, if the local node is only connected with the node that sends the dynamic record table of the recoverable load node of the contact switch node, then marking whether the branch line of the node corresponding to the dynamic record table of the recoverable load node of the contact switch node as traversed, and if the branch line of the node corresponding to the node that the dynamic record table of the recoverable load node of the contact switch node does not exist, then marking whether the branch line of the node as traversed the node of the dynamic record table of the contact switch node of the recoverable load node as traversed, and if the node of the dynamic record table of the contact switch node of the recoverable load node.
And 14, judging whether other adjacent nodes exist in the node except for the node connection on the planned island, if so, marking whether the node branch line corresponding to the node is traversed and not traversed in the dynamic recording table of the contact switch node recoverable load node, entering the step 15, otherwise, marking whether the node branch line corresponding to the node is traversed and not traversed in the dynamic recording table of the contact switch node recoverable load node, and entering the step 15.
And step 15, judging whether all the node names on the planned island to which the node belongs are recorded in the dynamic recording table of the recoverable load node of the tie switch node, if so, entering step 16, otherwise, forwarding the dynamic recording table of the recoverable load node of the tie switch node to any other node which is not recorded in the dynamic recording table of the recoverable load node of the tie switch node in the planned island.
And step 16, judging whether each node to which the planned island belongs in the dynamic record table of the contact switch node recoverable load node has a node marked as not traversed, if so, entering step 17, otherwise, sending the dynamic record table of the contact switch node recoverable load node to a node marked as not traversed by a corresponding node branch line which is recently recorded in the dynamic record table of the contact switch node recoverable load node, and if not, returning the dynamic record table of the contact switch node recoverable load node to the contact switch node.
And step 17, obtaining branch line grades of all nodes marked as not traversed on the planned island and other unrecorded adjacent nodes in the dynamic record table of the restorable load nodes of the liaison switch node, selecting the unrecorded node corresponding to the lowest branch line grade, if other adjacent nodes of the adjacent nodes in the planned island connected with the unrecorded node are recorded in the dynamic record table of the restorable load nodes of the liaison switch node, judging whether the branch lines of the nodes corresponding to the nodes in the planned island are traversed and marked as traversed or not in the dynamic record table of the restorable load nodes of the liaison switch node, and sending the dynamic record table of the recoverable load nodes of the liaison switch node to the unrecorded node.
To explain how to obtain branch line grades of all nodes marked as not traversed on the planned island and other unrecorded neighboring nodes in the dynamic record table of the tie switch node recoverable load node, in step 17, the method for obtaining branch line grades of all nodes marked as not traversed on the planned island and other unrecorded neighboring nodes in the dynamic record table of the tie switch node recoverable load node may be: the node sends and acquires an upstream and downstream relation information table to all nodes marked as non-traversed on the planned island, acquires the upstream and downstream relation information table of each corresponding node, and acquires branch line grades of all the nodes marked as non-traversed on the planned island and other non-recorded adjacent nodes in the dynamic record table of the interconnection switch node recoverable load node according to the upstream and downstream relation information tables.
The method for recovering the automatic power supply of the distributed feeder when the active power distribution network has the planned island is described in the form of an embodiment.
Examples
In this embodiment, as shown in fig. 3, in the entire networking, there are 24 load nodes (2-10 nodes, 12 nodes, 13 nodes, 15-21 nodes, and 23-28 nodes), 4 tie switch nodes (11 nodes, 14 nodes, 22 nodes, and 30 nodes), and 1 distributed power supply planning island (corresponding to a DG node, that is, a 29 node), where 1 node is a power supply node. In this embodiment, the load information of each load node is shown in table 1, and the available remaining capacity in the initial state of the interconnection switch is shown in table 2.
TABLE 1 load information Table
Figure BDA0003781826430000101
Figure BDA0003781826430000111
Table 2 available remaining capacity for initial state of tie switch
Switch numbering Available residual capacity (MVA)
11 15
14 40
22 7
30 8
According to the method, the specific processing flow is as follows:
step 1: and forming an upstream and downstream relation information table of each node. According to the electrical connection relation of the power distribution network, an upstream and downstream relation information table is filled in each node, and the tables are shown in tables 3 to 32. The "upstream and downstream relationship information table" is stored in a database of each node.
TABLE 3 upstream and downstream relationship information tables for nodes
Figure BDA0003781826430000112
TABLE 4 upstream and downstream relationship information tables for nodes
Figure BDA0003781826430000121
TABLE 5 upstream and downstream relationship information tables for nodes
Figure BDA0003781826430000122
Figure BDA0003781826430000131
Table 6 upstream and downstream relation information table of nodes
Figure BDA0003781826430000132
Table 7 upstream and downstream relation information table of nodes
Figure BDA0003781826430000133
Figure BDA0003781826430000141
Table 8 upstream and downstream relation information table of nodes
Figure BDA0003781826430000142
TABLE 9 upstream and downstream relationship information tables for nodes
Figure BDA0003781826430000143
Figure BDA0003781826430000151
Table 10 upstream and downstream relation information table of nodes
Figure BDA0003781826430000152
Table 11 upstream and downstream relation information table of nodes
Figure BDA0003781826430000153
Figure BDA0003781826430000161
Table 12 upstream and downstream relation information table of nodes
Figure BDA0003781826430000162
Table 13 upstream and downstream relation information table of nodes
Figure BDA0003781826430000163
Figure BDA0003781826430000171
Table 14 upstream and downstream relation information table of nodes
Figure BDA0003781826430000172
Table 15 upstream and downstream relation information table of nodes
Figure BDA0003781826430000173
Figure BDA0003781826430000181
Table 16 upstream and downstream relation information table of nodes
Serial number 1
Name of this node STU14
The address of this node 014
Name of adjacent node STU13
Neighboring node address 013
Upstream and downstream relation between local node and adjacent nodes Lower/upper
Name/whether the node is closed K1413/No
Name/close of connection switch of adjacent node K1314/is
Whether the node is a power supply node Whether or not
Whether the node is a DG node Whether or not
Whether the node is a connection switch node Is that
Whether the node plans to operate in an island or not NO/NO
Whether the node is a planned island boundary node/other planned island boundary node address No or not
Whether the node is an end load node Whether or not
Branch line class 1
Table 17 table 15 upstream and downstream relation information table of nodes
Figure BDA0003781826430000191
Table 18 upstream and downstream relation information table of nodes
Figure BDA0003781826430000192
Figure BDA0003781826430000201
Table 19 upstream and downstream relation information table of nodes
Figure BDA0003781826430000202
Table 20 upstream and downstream relation information table of nodes
Figure BDA0003781826430000203
Figure BDA0003781826430000211
Table 21 upstream and downstream relation information table of nodes
Figure BDA0003781826430000212
Table 22 upstream and downstream relation information table of nodes
Figure BDA0003781826430000213
Figure BDA0003781826430000221
Table 23 upstream and downstream relation information table of nodes
Figure BDA0003781826430000222
Table 24 upstream and downstream relation information table of nodes
Figure BDA0003781826430000223
Figure BDA0003781826430000231
Table 25 upstream and downstream relation information table of nodes
Figure BDA0003781826430000232
Table 26 upstream and downstream relation information table of nodes
Figure BDA0003781826430000233
Figure BDA0003781826430000241
Table 27 upstream and downstream relation information table of nodes
Figure BDA0003781826430000242
Table 28 upstream and downstream relation information table of nodes
Figure BDA0003781826430000243
Figure BDA0003781826430000251
Table 29 upstream and downstream relation information table of nodes
Figure BDA0003781826430000252
Table 30 upstream and downstream relation information table of nodes
Serial number 1
Name of this node STU28
The address of the local node 028
Name of adjacent node STU27
Neighboring node address 027
Upstream and downstream relation between local node and adjacent node Lower/upper
Name/whether the connection switch of the node is closed K2827/is
Name/close of connection switch of adjacent node K2728/is
Whether the node is a power supply node Whether or not
Whether the node is a DG node Whether or not
Whether the node is a connection switch node Whether or not
Whether the node plans to operate in an island or not No/no
Whether the node is a planned island boundary node/other planned island boundary node address No or
Whether the node is an end load node Is that
Branch line class 1
Table 31 upstream and downstream relation information table of nodes
Figure BDA0003781826430000261
Figure BDA0003781826430000271
Table 32 upstream and downstream relation information table of nodes
Serial number 1
Name of this node STU30
The address of the local node 030
Name of adjacent node STU7
Neighboring node address 007
Upstream and downstream relation between local node and adjacent node Lower/upper
Name/whether the connection switch of the node is closed K3007/No
Connection switch name/whether or not to close of adjacent node K0730/is
Whether the node is a power supply node Whether or not
Whether the node is a DG node Whether or not
Whether the node is a connection switch node Is that
Whether the node plans to operate in an island or not No/no
Whether the node is a planned island boundary node/other planned island boundary node address No or not
Whether the node is an end load node Whether or not
Branch line class 1
Step 2: the 1 node acquires the current value of the connecting switch K0102 and requires the 2 node to transmit the current value of K0201 to the 1 node, the 1 node compares the current values of the K0102 and the K0201, and whether the line 1-2 has a fault or not is judged according to a preset short-circuit current criterion. The method for judging whether the other lines have faults is the same as the method for judging the lines 1-2.
And step 3: when the line 1-2 has a fault, the node judges that the line 1-2 has the fault according to the step 2 and the node 1, the node 1 immediately disconnects the K0102, and informs the node 2 to disconnect the K0201, so that the fault is removed.
And 4, step 4: and (3) issuing search commands to 3 nodes and 12 nodes of the downstream side nodes of the branches from the node 2 where the downstream switch K0201 of the fault section is located, marking the 3 nodes and 12 nodes as downstream nodes of the fault section, issuing the search commands to 4 nodes by the 3 nodes, issuing the search commands to 13 nodes by the 12 nodes, marking the 4 nodes and 13 nodes as downstream nodes of the fault section, and repeating the process to search all the nodes downstream of the fault section one by one until a DG node, a tie switch node and an end load node. Each searched DG node and load node is labeled as a node downstream of the faulted section and each searched tie switch is labeled as a tie switch that can be used to recover the non-faulted blackout section.
And 5: after the nodes 18, 19, 20, 27 and 29 are marked as downstream nodes of a fault section, fault current is judged not to be in an island according to a short-circuit current criterion, and island boundary switches K1817, K2021 and K2728 are immediately disconnected to form a planned island.
And 6: the 14 nodes communicate with the 13 nodes, search the 13 nodes for whether the load can be recovered, and continue searching for neighboring, unsearched 12, 2, 3, etc. nodes until the remaining capacity of the end load node or the tie switch 14 node cannot be used to recover the node. The 22 nodes communicate with the 21 nodes, whether the 21 node load can be recovered is searched, the 30 nodes are continuously searched, because the 30 nodes are planned island boundary nodes and are already planned island operation, other boundary nodes (27 nodes) of non-traversed branches of a planned island are continuously searched, the 28 nodes are continuously searched, because the 28 nodes are end load nodes, after the 28 nodes are searched, the available residual capacity of the 22 nodes (contact switch nodes) is 1MW, 18 nodes adjacent to the non-traversed branch lines are continuously searched, because the 18 nodes are planned island boundary nodes, adjacent nodes (17 nodes) are continuously searched, and at the moment, the available residual capacity of the contact switch 22 nodes cannot recover the 17 nodes, and the search is stopped. And the 30 nodes communicate with the 7 nodes, search whether the load of the 7 nodes can be recovered, and continue to search adjacent nodes 23, 25 and 26 which are not searched.
Forming 14, 22 and 30 contact switch nodes restores the load dynamics record table as tables 33-35.
Table 33 table 14 dynamic recording table of interconnection switch node restorable load node
Figure BDA0003781826430000281
Table 34 contact switch node recoverable load node dynamic record table
Figure BDA0003781826430000282
Table 35 30 dynamic recording table of recoverable load node of tie switch node
Figure BDA0003781826430000283
According to the table 33, 14 contacts the switch node on switch K1413, sends a command to the 7 node to turn off the switch K0706, sends a command to the 16 node to turn off the switch K1617, and restores the power supply of the 13 node, the 12 node, the 2 node, the 3 node, the 4 node, the 5 node, the 6 node, the 15 node and the 16 node.
According to tables 34 and 22, a contact switch node closing switch K2221 is connected, a command is sent to a node 20 to close a switch K2021, a command is sent to a node 27 to close a switch K2728, power supply of the node 21 and the node 28 is restored, and the island is connected to the grid and operated.
According to table 35, 30 contacts switch node on switch K3007, restoring power to nodes 7, 23, 24, 25 and 26.
In the embodiment, the fault is removed by opening the switches K0102 and K0201 at the two ends of the fault section, and the power supply of the 1 node, the 8 node, the 9 node and the 10 node in the fault upstream area is rapidly recovered. Planned island boundary switches K1817, K2021 and K2728 are turned off, and a planned island (including 18 nodes, 19 nodes, 20 nodes, 27 nodes and 29 nodes) is rapidly formed. And in the fault recovery stage, only 17 nodes at the downstream of the fault do not recover power supply, and the rest load nodes recover power supply.

Claims (3)

1. A distributed feeder automatic power supply recovery method during planned island of an active power distribution network is applied to a distributed feeder automatic system, the distributed feeder automatic system comprises a transformer substation 10kV outgoing switch and intelligent terminal units of multiple groups of ring networks, and each group of ring networks comprises a connecting switch, and the distributed feeder automatic system is characterized in that the transformer substation 10kV outgoing switch and each group of ring networks respectively comprise an overcurrent detection element, the overcurrent detection element is used for detecting current information flowing through the connecting switch and the on-off state of the switch, the transformer substation 10kV outgoing switch and each group of ring networks form an upstream-downstream relationship according to the corresponding active power distribution network group, each transformer substation 10kV outgoing switch and each group of ring networks respectively serve as a node, and aiming at any node, the method comprises the following processing steps:
step 1, prestoring an upstream and downstream relation information table and each line short-circuit current criterion, wherein the upstream and downstream relation information table at least comprises a local node name, a local node address, an adjacent node name, an adjacent node address, an upstream and downstream relation between the local node and the adjacent node, a local node connecting switch name, whether a local node connecting switch is closed, an adjacent node connecting switch name, whether an adjacent node connecting switch is closed, whether the local node is a power supply node, whether the local node is a DG node, whether the local node is a contact switch node, whether the local node plans a node in an island/whether the island operates, whether the local node is an island planning boundary node/other island planning boundary nodes, whether the local node is a terminal load node and a branch line grade;
step 2, regularly judging whether each line has a fault according to the pre-stored short-circuit current criterion of each line, if so, entering step 3, otherwise, not processing, wherein the line refers to a line from a connecting switch connected with the node and an adjacent downstream node to a connecting switch connected with the node, and the regularly judging whether each line has a fault according to the pre-stored short-circuit current criterion of each line specifically comprises the following steps: for any line, acquiring the current value of a connecting switch connected with a corresponding adjacent downstream node in real time according to a prestored upstream and downstream relation information table to serve as the current value of the upstream switch of the line, simultaneously sending acquired current value information to the corresponding adjacent downstream node according to the prestored upstream and downstream relation information table, acquiring the current value of the connecting switch connected with the node in real time to serve as the current value of the downstream switch of the line, comparing the current value of the upstream switch of the line with the current value of the downstream switch of the line, and judging whether each line has a fault according to prestored short-circuit current criteria of each line;
step 3, the node disconnects the connection switch on the line, sends a disconnection notice to the adjacent node corresponding to the line, and removes the fault;
step 4, if the node receives a disconnection notification sent by an upstream node, controlling a connection switch connected with the upstream node to be disconnected, meanwhile, judging whether the node is a DG node or an end load node or a tie switch node according to an upstream and downstream relation information table, if the node is the DG node or the end load node or the tie switch node, marking the node as the DG node or the end load node or the tie switch node at the downstream of the fault section, otherwise, not processing, then sending a search instruction to each downstream node adjacent to the node according to the upstream and downstream relation information table, receiving feedback information of the downstream node, further searching each DG node, the end load node and the tie switch node at the downstream of the fault section, and entering step 5;
step 5, judging whether the fault section is in a planned island or not according to the upstream and downstream relation information table, if not, informing the boundary switches of the planned islands corresponding to the DG nodes at the downstream of the searched fault section to be immediately disconnected to form the planned island, and if so, informing the boundary switches of the planned islands corresponding to the DG nodes at the downstream of the other fault sections except the planned islands corresponding to the fault section to be immediately disconnected to form the planned island;
step 6, if the node receives a search instruction sent by an upstream node, judging whether the node is a DG node or an end load node or a contact switch node, if the node is the DG node or the end load node or the contact switch node, marking the node as the DG node or the end load node or the contact switch node at the downstream of the fault section, and simultaneously feeding back the node to the upstream node, otherwise, sending the search instruction to each downstream node adjacent to the node according to an upstream and downstream relation information table, receiving feedback information of the downstream node, and forwarding the feedback information to the upstream node according to the corresponding search instruction;
step 7, if the node is a contact switch node and is marked as a contact switch node at the downstream of a fault section, the node sends available residual capacity to an adjacent upstream node sending a search instruction, receives a local contact switch node restorable load node dynamic recording table fed back by the upstream node, notifies a node recorded last on the node and a recorded downstream node adjacent to the node according to the local contact switch node restorable load node dynamic recording table, disconnects a connecting switch connected between the node and the node, notifies a recorded node which is not traversed and a recorded node adjacent to the node which is not traversed, disconnects the connecting switch connected between the node and the node, and notifies a node corresponding to a boundary switch of a recorded planned island to close the boundary switch of the planned island if the boundary switch of the planned island is recorded on the node, finishes planned island operation, and closes the connecting switch connected between the node and the adjacent upstream node sending the search instruction after the notification is finished;
step 8, if the node receives the available residual capacity sent by the contact switch node, generating and filling a dynamic recording table of the recoverable load node of the contact switch node, judging whether the available residual capacity is enough to recover the load of the node, if so, selecting an adjacent node with the lowest branch line grade of the node and other adjacent nodes except the contact switch node, forwarding the dynamic recording table of the recoverable load node of the contact switch node to the adjacent node, and otherwise, feeding back the dynamic recording table of the recoverable load node of the contact switch node to the contact switch node; the dynamic recording table of the contact switch node recoverable load node at least comprises the name of the contact switch node, the searched node name, the corresponding node load, the dynamic value of the available residual capacity after deducting the corresponding node load and whether the corresponding node branch line traverses or not;
step 9, if the node receives a dynamic recording table of a contact switch node restorable load node sent by an adjacent node, judging whether the name of the node is recorded in the dynamic recording table of the contact switch node restorable load node, if so, entering step 10, otherwise, filling the name of the node in the dynamic recording table of the contact switch node restorable load node, and entering step 11;
step 10, selecting an adjacent node with the lowest branch line grade from branch lines which are not traversed by the node, if no other branch lines which are not traversed exist in the adjacent node, marking whether the node branch line corresponding to the node is traversed or not in the dynamic record table of the recoverable load node of the contact switch node as traversed, and simultaneously forwarding the dynamic record table of the recoverable load node of the contact switch node to the adjacent node, otherwise, directly forwarding the dynamic record table of the recoverable load node of the contact switch node to the adjacent node;
step 11, judging whether the node is a node in a planned island, if so, recording that the load of the node is 0 in a dynamic recording table of the interconnection switch node recoverable load node, and entering step 14, otherwise, entering step 12;
step 12, recording the load of the local node and the dynamic value of the available residual capacity after the load of the corresponding node is deducted in the dynamic record table of the interconnection switch node recoverable load, and simultaneously judging whether the dynamic value of the available residual capacity after the load of the corresponding node is deducted is a negative number, if so, returning the dynamic record table of the interconnection switch node recoverable load to the interconnection switch node, otherwise, entering step 13;
step 13, selecting an adjacent node with the lowest branch line grade, connected with other unrecorded adjacent nodes in the dynamic recording table of the interconnection switch node recoverable load node, of the local node, if the adjacent node has no other adjacent node unrecorded in the dynamic recording table of the interconnection switch node recoverable load node, then marking whether a branch line of the node corresponding to the local node traverses the dynamic recording table of the interconnection switch node recoverable load node as traversed, and simultaneously forwarding the dynamic recording table of the interconnection switch node recoverable load node to the adjacent node, otherwise, marking whether a branch line of the node corresponding to the local node traverses the dynamic recording table of the interconnection switch node recoverable load node as not traversed, and meanwhile forwarding the dynamic recording table of the interconnection switch node recoverable load node to the adjacent node, if the local node is only connected with the node sending the dynamic recording table of the interconnection switch node recoverable load node, then marking whether a branch line of the node corresponding to the dynamic recording table of the interconnection switch node corresponding to the local node as traversed, and if the branch line of the interconnection switch node corresponding to the dynamic recording table of the interconnection switch node recoverable load node returns the traversed to the node, and marking whether the branch line of the node corresponding to the dynamic recording table of the interconnection switch node as traversed, and if the branch line of the node of the interconnection switch node does not exist in the dynamic recording table of the interconnection switch node;
step 14, judging whether other adjacent nodes exist in the node except for the node connection on the planned island, if so, marking whether a node branch line corresponding to the node is traversed and not traversed in the dynamic record table of the contact switch node recoverable load node, and entering step 15, otherwise, marking whether the node branch line corresponding to the node is traversed and not traversed and entering step 15;
step 15, judging whether all node names on a planned island to which the node belongs are recorded in the dynamic recording table of the recoverable load node of the tie switch node, if so, entering step 16, otherwise, forwarding the dynamic recording table of the recoverable load node of the tie switch node to any other node in the planned island which is not recorded in the dynamic recording table of the recoverable load node of the tie switch node;
step 16, judging whether each node of the plan island in the dynamic record table of the contact switch node recoverable load node has a node marked as not traversed, if so, entering step 17, otherwise, sending the dynamic record table of the contact switch node recoverable load node to a node marked as not traversed by a corresponding node branch line which is recorded recently in the dynamic record table of the contact switch node recoverable load node, and if not, returning the dynamic record table of the contact switch node recoverable load node to the contact switch node;
and step 17, obtaining branch line grades of all nodes marked as not traversed on the planned island and other unrecorded adjacent nodes in the dynamic record table of the interconnection switch node recoverable load nodes, selecting the unrecorded node corresponding to the lowest branch line grade, if other adjacent nodes of the adjacent nodes in the planned island connected with the unrecorded node are recorded in the dynamic record table of the interconnection switch node recoverable load nodes, marking whether the node branch lines corresponding to the nodes in the planned island are traversed or not in the dynamic record table of the interconnection switch node recoverable load nodes as traversed, and sending the dynamic record table of the interconnection switch node recoverable load nodes to the unrecorded nodes.
2. The method according to claim 1, wherein in step 17, the method for obtaining branch line levels of all nodes marked as not traversed on the planned island and other nodes adjacent to nodes that are not recorded in the dynamic load node recording table and can be recovered by the tie switch node includes: the node sends and acquires an upstream and downstream relation information table to all nodes marked as non-traversed on the planned island, acquires the upstream and downstream relation information table of each corresponding node, and acquires branch line grades of all the nodes marked as non-traversed on the planned island and other non-recorded adjacent nodes in the dynamic record table of the interconnection switch node recoverable load node according to the upstream and downstream relation information tables.
3. The automatic power supply recovery method for the distributed feeder during planned islanding of the active power distribution network according to claim 1 or 2, wherein step 9 is specifically:
step 901, if the node receives a dynamic recording table of a recoverable load node of a contact switch node sent by an adjacent node, judging whether the node has received a dynamic recording table of a recoverable load node of other contact switch nodes, if so, entering step 902, otherwise, entering step 903;
step 902, judging whether the available residual capacity dynamic value corresponding to the node in the other contact switch node recoverable load node dynamic record table is a positive number, if not, entering step 903, if so, sending the currently received contact switch node recoverable load node dynamic record table to a node which is recorded most recently in the contact switch node recoverable load node dynamic record table and is marked as not traversed, and if not, returning the currently received contact switch node recoverable load node dynamic record table to the corresponding contact switch node; (ii) a
Step 903, judging whether the node name is recorded in the currently received dynamic recording table of the contact switch node recoverable load node, if so, entering step 10, otherwise, filling the node name in the dynamic recording table of the contact switch node recoverable load node, and entering step 11.
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