KR101542609B1 - Power fault restoration apparatus and method for operating the same - Google Patents

Abstract

The present invention relates to a fault recovery device for judging and repairing simultaneous internal faults of a plurality of substations existing in a power distribution system and a method of operating the same. The fault recovery device of the present invention for this purpose includes a fault determination unit for determining whether there are substations having an internal fault among a plurality of substations; And a recovery unit for performing an internal fault recovery according to a predetermined algorithm using the spare capacity of the substation for restoration of power failure of substations having the internal fault.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a failure recovery apparatus,

The present invention relates to a fault recovery apparatus for performing fault recovery of a power distribution system and a method of operating the same, and more particularly to a fault recovery apparatus for determining a simultaneous internal fault of a plurality of substations existing in a power distribution system, ≪ / RTI >

Conventionally, when internal faults occur simultaneously in a plurality of substations, internal restoration of respective substations has been performed. If such a substation can not be restored internally, there are various types of recovery operations in an electric power distribution system. However, most of these recovery operations are due to the experience of the distribution operator or the recovery of the power distribution system in a passive manner. Therefore, there is a problem that the recovery operation involves considerable time and involves human error factors. Accordingly, a system for quickly determining a failure is indispensable, and a method for minimizing the time for a recovery operation is also important.

Recent advances in power IT technology have enabled high-speed processing and transmission of information in the distribution system. Due to these advances in power IT technology, it is now possible to exchange information about the failure information inside the substation and the failure of the power distribution system. Especially, when the information of the distribution line connected to each substation is delivered directly to the distribution system operator due to the simultaneous failure of many substations, there is a need for a standardized system that analyzes the failure recovery plan and helps to cope with the failure quickly do.

In this regard, Korean Patent Laid-Open No. 10-2010-0018817, titled " Distributed Intelligent Distribution Line Failure Recovery System and its Operation Method ", is available.

It is an object of the present invention to provide a fault recovery device and a method of operating the same that automatically cause such an internal fault to be resolved through predetermined methods when an internal fault occurs simultaneously in one or more substations in a plurality of substations.

Further, the present invention provides information for restoring the failure of substations to the distribution system operator on-line when an internal failure occurs simultaneously in one or more substations in a plurality of substations, thereby enabling rapid fault recovery through the operator And to provide a fault recovery apparatus and a method of operating the same.

According to an aspect of the present invention, there is provided a failure recovery apparatus including: a failure determination unit for determining whether there are substations having an internal failure among a plurality of substations; And a recovery unit for performing an internal fault recovery according to a predetermined algorithm using the spare capacity of the substation for restoration of power failure of substations having the internal fault.

In addition, the system may further include an open-point connection unit for performing recovery to the internal fault-unrecoverable substations via the open-ended point connection when there are internal fault-unrecoverable substations that are not capable of internal fault recovery.

In addition, when there are substations that can not be restored through the open-circuit connection, the load distribution of the power distribution system is analyzed, and the load distribution of the power distribution system is reconstructed using the load distribution, Wherein the internal fault recovery, the always-open point connection, and the separation into the always-connected line can be sequentially performed. Also, if the open-circuit connection is higher than the fault-recovering capacity available through the distribution line with a good generation capacity for power generation caused by the fault distribution line to the fault distribution line for the substation that can not be internally recovered, . ≪ / RTI >

In addition, the open point connection unit may preferentially perform the connection of the always-open point from the restoration priority distribution line by dividing the restoration priority distribution line among the entire distribution lines according to a predetermined algorithm.

Also, the open-point connecting unit can sequentially connect the open-ended points to the distribution lines having no restoration priority according to the used capacity.

In addition, the connection line separating unit may not perform the connection line separation at all times when reconfiguration of the distribution system load distribution is not possible, or when it is impossible to recover through the normal connection line separation.

According to an aspect of the present invention, there is provided a method of operating a fault recovery apparatus, including: determining whether a substation having an internal fault exists among a plurality of substations by a fault determination unit; And an internal fault recovery step of using the spare capacity of the substation according to a predetermined algorithm by the restoration section for restoration of power failure of substations having an internal fault.

In addition, after the internal fault recovery performing step, if there are internal fault-unrecoverable substations that can not be internally recovered, performing recovery for the internal fault-unrecoverable substations through the open-ended point connection by the open- .

If there are substations which can not be recovered through the open-circuit connection, the load distribution of the power distribution system is analyzed by the connection line separation unit, and the load distribution And reconfiguring the power distribution system load distribution using the power distribution system to perform separation for the always-connected line.

In addition, the step of performing the internal fault recovery, the step of performing the restoration to the internal fault-unrecoverable substations, and the step of performing the separation of the always-connected line may be performed sequentially.

In addition, the step of performing restoration to the internal failure-recovery-capable substations may include a step of performing a restoration to the internal failure-unrecoverable substation, a failure that can be supplied through the distribution line having a good capacity for generating an interruption generated by the accident- If it is higher than the recovery free capacity, the always open point connection may not be performed.

In addition, the step of performing restoration to the internal failure-recovery-capable substations may include dividing the restoration priority distribution line among the entire distribution lines according to a predetermined algorithm, and prioritizing the connection from the restoration priority distribution line to the always- Can be performed.

In addition, the step of performing recovery for the internal failure-recovery-capable substations may successively perform the connection of the open-ended points in sequence to the distribution lines having no restoration priority.

In addition, the step of performing the separation for the always-connected line may not perform the always-connected line separation when reconstruction of the distribution system load distribution is not possible or recovery is not possible through the normal connection line separation.

According to the fault recovery device and the method of operating the same of the present invention, when an internal fault occurs simultaneously in one or more substations in a plurality of substations, it is possible to sequentially perform predetermined fault recovery methods to perform quick and correct fault recovery There is an effect.

In addition, according to the fault recovery device and the method of operating the same according to the present invention, when an internal fault occurs simultaneously in one or more substations, information on the fault is transmitted to the power distribution system operator online, There is an effect that is possible.

According to the fault recovery device and the method of operation of the present invention, fault recovery can be quickly performed by acquiring and analyzing information on the electrostatic feeder in real time in order to improve high-quality reliability of power operation, It is possible to improve the reliability of supply of high quality.

1 is a block diagram of a fault recovery system in accordance with an embodiment of the present invention.
2 is a block diagram of a failure recovery apparatus according to an embodiment of the present invention.
3 is a flowchart illustrating an operation method of a fault recovery apparatus according to an embodiment of the present invention.
FIG. 4 is a flowchart illustrating a method of operating a failure recovery apparatus according to an exemplary embodiment of the present invention. Referring to FIG.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shapes and sizes of the elements in the drawings and the like can be exaggerated for clarity.

Hereinafter, a fault recovery system 1000 according to an embodiment of the present invention will be described with reference to FIG. 1 is a block diagram of a fault recovery system in accordance with an embodiment of the present invention. 1, a fault recovery system 1000 according to the present invention includes a power feeder 10, an information processing device 20, a plurality of substations 30, a power distribution station 40, and a fault recovery device 100). Descriptions of these configurations are provided below.

The plurality of substations 30 functions to convert the power produced by the power plant into power available to the consumer or the consumer.

The power feeder 10 collects information on a plurality of substations 30 and collects the collected information. More specifically, the power feeder 10 integrally monitors and controls the N substations in order to more reliably operate the local power system. Here, the number of substations managed by the feeder 10 is usually about 10, but the number of the substations is not limited thereto. In addition, the feeder box 10 serves as a control center for controlling and managing a plurality of substations, as mentioned above. That is, the power feeder 10 can monitor and manage status information and measurement information, for example, voltage and current of the substation installed in each substation in real time. Accordingly, when a power failure occurs in at least one substation among a plurality of substations managed in the power feeder 10, it is possible to confirm the accident information.

The information processing apparatus 20 functions to transmit information collected and collected in the feed station 10 to the failure recovery apparatus 100 in real time. To this end, the information processing apparatus 20 may be installed in the feed mill 10 or may be installed separately on the outside.

The distribution station 40 is a facility installed for integrated monitoring and control of the regional distribution system used for smooth power supply from a substation to individual customers or households. That is, the power distribution station 40 is a power distribution automation center installed to monitor and control the distribution lines connected to the distribution feeders inside each substation by region. To this end, the distribution station 40 monitors the distribution lines and various switches and distribution facilities in the area to be controlled. In addition, the power distribution station 40 is a facility in which a power distribution system operator who performs an accident recovery (for example, an always-open point connection or an always-connected line separation operation) of a distribution line occurs when an accident occurs in the distribution line.

The fault recovery apparatus 100 functions to perform a fault recovery when an internal fault occurs in one or more substations of the plurality of substations. More specifically, the fault recovery apparatus 100 transmits data (for example, voltage, current, and status information for each substation) of the substation for fault recovery through an HMI (Human Machine Interface) and various databases It can be acquired from the information processing apparatus 20. Thus, the fault recovery apparatus 100 can perform a fault recovery algorithm for one or more substations where an internal fault has occurred. To this end, the fault recovery apparatus 100 stores various information necessary for the obtained wiring system control to determine the final failure distribution line in a plurality of substations, and a program for issuing an instruction to operate the distribution system using these information Respectively.

In addition, the fault recovery apparatus 100 may acquire line information of a power distribution system in which a power failure has occurred in connection with an internal failure of one or more substations where an internal fault has occurred, and provide the information to the power distribution system operator . In addition, the failure recovery apparatus 100 may calculate a failure recovery algorithm for an internal failure that has occurred, and provide a control method for failure recovery to the power distribution system operator. In addition, the fault recovery apparatus 100 performs a function of automatically controlling a breaker or the like of the distribution line in response to a fault selection according to the selection of the operator of the distribution system.

Hereinafter, referring to FIG. 2, a failure recovery apparatus according to an embodiment of the present invention will be described in more detail. 2 is a block diagram of a failure recovery apparatus according to an embodiment of the present invention. 2, the failure recovery apparatus according to the present invention may include a failure determination unit 110, a restoration unit 120, an open-end connection unit 130, and a connection line separation unit 140 . Descriptions of these configurations are provided below.

The failure determination unit 110 determines whether there are substations in which an internal failure has occurred among a plurality of substations based on status information about a plurality of substations transmitted from the information processing apparatus of FIG. Here, as described with reference to FIG. 1, the information processing apparatus transmits the status information of the substations collected and collected at the power feeder to the failure determination apparatus 100 of the present invention in real time. That is, the failure determining unit 110 determines whether an accident has occurred in at least one substation using the received state information, for example, voltage, current, and failure information of the substation included in substations where an internal fault has occurred can do.

The restoration unit 120 performs internal fault recovery according to a predetermined algorithm when it is determined that the substation having an internal fault exists in the fault determination unit 110. [ In addition, the restoring unit 120 can perform internal recovery by dividing the number of substations where an internal failure occurs, or a plurality of substations. To this end, the restoration unit 120 may use the status information received by the failure determination unit 110 to determine whether internal failure recovery is possible for substations having an internal failure.

Specifically, the restoring unit 120 first compares the available capacity of the substation with the capacity of the substations having the internal failure using the status information of the substations, to recover the internal faults of the substations having the internal faults. do. As a result of the comparison, when it is determined that the spare capacity of the substation is higher than the capacity for generating the electrostatic discharge, the restoration unit 120 uses an established algorithm for using the spare capacity of the substation as the power generation capacity of the substations having the internal fault, Recovery can be performed.

For example, assume that the number of substations shown in Fig. 1 is 10. It is also assumed that an internal failure has occurred in the first and second substations among the 10 substations, and that the third to tenth substations operate normally. That is, it will be understood that there is an electrostatic charge generating capacity due to an internal failure of the first and second substations, and a spare capacity exists in the third to tenth substations. The restoring unit 120 may use a predetermined algorithm that performs internal restoration by itself through comparison between the electrostatic generating capacity and the spare capacity.

The restoration unit 120 may determine whether there is a substation in which an internal failure occurs after the internal restoration described above. When it is determined that substations where an internal failure has occurred or additional substations which are not recovered even after internal recovery exist, the open-end connection unit 130 and the connection line separation unit 140, which will be described below, The restoration of the power distribution system through the network is further performed.

The open-loop connection unit 130 performs a recovery operation on the internal fault-unrecoverable substations through the open-ended connection when there are internal fault-unrecoverable substations that can not recover from the internal fault. That is, the open point connection unit 130 performs restoration of the substations that have not been restored through the internal restoration through the restoration unit 120. Here, the term " normal open point " refers to a connection which is always open to the lines in the distribution system. Here, the open-point connection unit 130 confirms the used capacity immediately before and after the accident on the distribution line of the internal failure-repairable substations in order to judge whether recovery through the above-mentioned regular open-circuit connection is possible. In addition, the open point connection unit can receive the distribution load information of the distribution system and the switch state information from the distribution station shown in Fig. Through the information on the used capacity, the distribution load information, and the switch state information, the open-point connection unit 130 can determine whether or not the internal failure-unrecoverable substations can be recovered through the always-open connection. In other words, the open-point connection unit 130 can recover through the open-ended connection when the fault recovery capacity of the distribution line for recovering the internal fault-recoverable substations is equal to or greater than the capacitance of the fault distribution line based on the always- . Otherwise, the open point connection 130 may determine that it is not possible to recover through the always open point connection or that only partial recovery is possible.

The open point connection unit 130 performs recovery by separating the recovery priority distribution line and the distribution line having no restoration priority when it is determined that restoration through the open end connection is possible or at least partially possible. Here, the restoration priority distribution line represents a line that is set by itself as having a high importance. These settings can be preset by the operator or automatically set according to their own algorithms. The open point connection unit 130 preferentially performs the always-open point connection to the restoration priority distribution line in accordance with this classification.

The open point connection unit 130 performs a connection to the open end point of the distribution line having no restoration priority when the connection of the normal open point to the restoration priority distribution line is completed. Here, the open point connection unit 130 may sequentially connect the open end points of the distribution lines having no restoration priority according to the size of the used capacity. The present invention has the advantage that more efficient recovery is possible according to the characteristics in consideration of the recovery priority and the used capacity of the open point connection unit 130. [

If the open-circuit connection unit 130 is higher than the fault-recovery allowable capacity that can be supplied through the distribution line having the good generation capacity of the power generation caused by the fault distribution line to the fault distribution line for the substation where the fault recovery is not possible, Does not perform the always-open point connection mentioned.

Additionally, the open-point connection 130 may further determine whether the recovery to the internal fault-recoverable substations through the open-ended connection is complete. As a result of the determination, if there are substations that can not be restored through the open-circuit connection, the restoration of the power distribution system through the connection line separation unit 140 described below is further performed.

As described above, the connection line separating unit 140 performs the function of restoring the power distribution system by separating the connection lines when the substations are present. Here, the term " ordinary connection line " refers to a line connected in a steady state in a distribution line in the distribution system. The connection line separating unit 140 first uses the state information received by the failure determining unit 110 to grasp the load distribution on the power distribution system. Thereafter, the connection line separating unit 140 judges whether or not the distribution system load distribution is reconstructed using the detected load distribution. Thereafter, the connection line separating unit 140 can find a way to minimize the power failure area by reconstructing the load distribution when the reconfiguration of the power distribution system load distribution is possible, and recover the fault distribution system through the derived scheme. That is, the connection line separating unit 140 can perform a normal connection line separation by finding a combination in which the power failure area can be minimized by using the maximum value of the fault recovery allowance that can be recovered from an accident based on the average load amount per section.

Here, the internal failure recovery through the recovery unit 120, the always-open point connection through the open point connection unit 130, and the continuous connection line separation through the connection line separation unit 140 are sequentially performed, The failure recovery can be completed. As a result, human errors that may occur due to human manipulation are minimized, and reliability of supply through rapid restoration of power failure can be improved.

Hereinafter, with reference to FIG. 3, an operation method of a failure recovery apparatus according to an embodiment of the present invention will be further described. 3 is a flowchart illustrating an operation method of a fault recovery apparatus according to an embodiment of the present invention. In the following description, the matters overlapping with those mentioned with reference to Figs. 1 and 2 are omitted for clarity of description.

First, in step S110, it is determined whether there is a substation having an internal fault among a plurality of substations by the fault determination unit. As described with reference to FIG. 2, the determination in step S110 may use status information on a plurality of substations transmitted from the information processing apparatus. Here, the status information represents information on substations, such as, for example, voltage, current, and fault information of substation facilities included in substations where an internal fault has occurred. If it is determined in step S110 that there is a substation with an internal failure, control is passed to step S120. Otherwise, step S110 is repeatedly performed to determine whether or not the substation is abnormal.

In step S120, the restoration unit determines whether there is a substation capable of restoring an internal fault among substations having an internal fault. For the determination in step S120, the status information on the substations mentioned in step S110 may be used. That is, in step S120, the available capacity of the substation and the outage occurrence capacity of the substations having the internal fault are compared using the status information of the substations. As a result of the comparison, if it is determined that the spare capacity of the substation is higher than the capacity of the STB, it is determined that there is a substation capable of internal recovery among the substations having an internal fault. If it is determined in step S120 that there is a substation capable of performing internal fault recovery, control is passed to step S130. Otherwise, control passes to step S150.

In step S130, the internal fault recovery of the substations having an internal fault is performed by the recovery unit. Step S130 may use a predetermined algorithm for internal fault recovery. Here, the predetermined algorithm is an algorithm for using the spare capacity of the substation as the disconnection occurrence capacity of substations having an internal fault, and the details thereof are described with reference to FIG. 2, so that a further description thereof will be omitted. In step S130, it is possible to perform the internal recovery in consideration of both when there is one recoverable substation and when there are plural recoverable substations. When the internal recovery is completed, control is passed to step S140.

In step S140, it is determined whether there is a substation that can not be internally recovered, and whether there is a substation in which an internal fault has occurred, through the restoration process of step S130. If it is determined in step S140 that there is a substation that can not be internally restored, or if there is a substation in which an internal fault occurs, control is passed to step S150. Otherwise control is passed to the end block.

In operation S150, it is determined whether there is a recoverable substation through the open-end connection by the open-circuit connection. That is, in step S150, it is determined whether there is a substation that can be recovered through the open-end connection among the substations that have not been restored through steps S120 to S140. For this determination, step S150 may use the information on the capacity used immediately before and after the accident, the distribution load information, and the switch state information for the distribution line of the internal failure-unrecoverable substations referred to with reference to FIG.

Step S150 is performed by comparing the power generation capacity generated by the fault distribution line with the fault recovery capacity available through the good distribution line for the fault distribution line for the substations that can not be internally recovered by using the state information . That is, if it is determined in step S150 that the fault recovery free capacity is higher than the power generation capacity, it is determined that recovery through the open point connection is possible. If not, it is judged impossible to restore through the always open point connection. As a result of the determination in step S150, if it is determined that there is a substation capable of recovering through the open-loop connection, the control is transferred to step S160. Otherwise, control passes to step S180.

The step S160 performs a recovery operation on the internal fault-unrecoverable substations through the connection of the always-open point. The recovery through connection of the normally open point in step S160 may be performed in consideration of the distribution line having the restoration priority and the size of the used capacity as mentioned with reference to FIG. This is described with reference to FIG. 2, and thus description thereof is omitted. When the restoration process is completed in step S160, control is passed to step S170.

In step S170, it is determined whether there are any substations that are not recovered due to the always-open-point connection recovery. As a result of the determination in step S170, when there are substations that are not recovered through the connection of the always-open point, the control is transferred to step S180. Otherwise, control is passed to the end block when recovery is complete via the normally open point connection.

In step S180, it is determined whether reconfiguration of the distribution system load distribution is possible. Step S180 is performed to judge whether or not the distribution line can be recovered through the continuous connection line separation. For this purpose, step S180 determines the load distribution of the corresponding distribution line. After that, reconfigure the distribution line through the operation of the circuit breaker and switch based on the load distribution, and reconstruct the load distribution of the distribution system. As a result of the reconfiguration, if it is searched for a method capable of minimizing the power failure area, it is determined that it is possible to always disconnect the connection line, and control is transferred to step S190. Otherwise, control is passed to the end block.

Step S190 is a step of performing a restoration of the power distribution system through the continuous connection line separation for the substations that can not be restored through the open point connection. This description has been referred to with reference to FIG. 2, so that further description is omitted for the sake of clarity.

In addition, the recovery process through the internal fault recovery, the always-open point connection, and the always-connected line separation is sequentially performed, and the internal fault recovery for the substations can be performed more efficiently.

Hereinafter, with reference to FIG. 4, the step of performing the always-open-point connection of FIG. 3 will be described in more detail. FIG. 4 is a flowchart illustrating a method of operating a failure recovery apparatus according to an exemplary embodiment of the present invention, which performs a normally open point connection. In the following description, duplicate matters with reference to FIG. 2 are omitted for clarity of description.

First, a step S161 for determining whether a restoration priority distribution line exists is performed. Here, the restoration priority distribution line represents a line that is set by itself as having a high importance. These settings can be preset by the operator or automatically set according to their own algorithms. If it is determined in step S161 that there is a restoration priority distribution line, control is transferred to step S162. Otherwise, control passes to step S164.

Step S162 is a step of performing an always-open point connection from the restoration priority distribution line. If the connection of the normally open point of the restoration priority distribution line through step S162 is completed, control is transferred to step S163.

In step S163, it is determined whether there is a distribution line having no restoration priority other than the restoration priority distribution line. If it is determined that there is a distribution line having no restoration priority, control is passed to step S164. Otherwise, control is passed to step S170.

Step S164 is a step of performing the always-open point connection in order of the used capacity for the distribution lines having no restoration priority. Through the steps S161 to S164, the recovery process through the connection of the normally open points is completed.

As described above, an optimal embodiment has been disclosed in the drawings and specification. Although specific terms have been employed herein, they are used for purposes of illustration only and are not intended to limit the scope of the invention as defined in the claims or the claims. Therefore, those skilled in the art will appreciate that various modifications and equivalent embodiments are possible without departing from the scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Fault recovery unit 110: Fault determination unit
120: Recovery part 130: Open point connection part
140: connection line separation unit

Claims (13)

A failure determination unit for determining whether there are any substation among the plurality of substations based on the state information of the substation installed in each substation and the measurement information about the voltage and the current;
A recovery unit for performing an internal fault recovery according to a predetermined algorithm using the spare capacity of the substation for recovering power from substations having the internal fault;
An open-point connection unit for performing restoration of the internal fault-unrecoverable substations by reconfiguring the line through the always-open-point connection when there are internal fault-unrecoverable substations where the internal fault can not be recovered; And
The load distribution of the power distribution system is analyzed and the load distribution of the power distribution system is reconfigured using the load distribution to separate the connection line Wherein the internal fault recovery, the connection of the always-open point, and the separation of the always-connected line are performed sequentially. delete delete The method according to claim 1,
The open-
If it is determined that the power generation capacity generated by the fault distribution line is higher than the fault recovery capacity that can be supplied through the distribution line having a good capacity to the fault distribution line for the internal failure- And a failure recovery device. The method according to claim 1,
The open-
Characterized by dividing the restoration priority distribution line among the entire distribution lines according to a predetermined algorithm and preferentially performing the connection of the normally open point from the restoration priority distribution line. The method according to claim 1,
The open-
Characterized in that the failure recovery device sequentially performs the connection of the normally open points according to the used capacity for the distribution line having no restoration priority. The method according to claim 1,
The connection line separating unit includes:
Wherein the normal connection line separation is not performed when reconfiguration of the distribution system load distribution is not possible or recovery through the normal connection line separation is not possible. Determining whether any of the plurality of substations has an internal fault based on the state information of the substation installed in each substation and the measurement information on the voltage and the current by the fault determination unit;
Performing an internal fault recovery using the spare capacity of the substation according to a predetermined algorithm by the restoration unit for restoration of power failure of substations having an internal fault;
The method of claim 1, wherein, if there are internal fault recovery non-recoverable substations that are not capable of internal fault recovery after the internal fault recovery performing step, restoration of the internal fault-unrecoverable substations by reconfiguring the line through the open- ; And
The method according to claim 1, wherein, when there are substations that can not be recovered through the open-ended connection, the connection line separating unit analyzes the load distribution of the power distribution system, Reconfiguring the distribution system load distribution with the use of the power supply system,
Wherein the step of performing the internal fault recovery, the step of performing recovery for the internal failure recovery-unavailable substations, and the step of performing the separation for the always-connected line are sequentially performed. delete delete 9. The method of claim 8,
The method of claim 1, wherein performing the recovery on the internal fault-
Characterized by dividing the restoration priority distribution line among the entire distribution lines according to a predetermined algorithm and preferentially performing the connection of the normally open point from the restoration priority distribution line. 9. The method of claim 8,
The method of claim 1, wherein performing the recovery on the internal fault-
Characterized in that the connection of the normally open point is sequentially performed for the distribution line having no restoration priority according to the used capacity. 9. The method of claim 8,
Wherein the step of performing separation on the always-
Wherein the normal connection line separation is not performed when reconfiguration of the distribution system load distribution is not possible or recovery through the normal connection line separation is not possible.

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