JPH0341005B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a power outage determination method for power system equipment,
In particular, the present invention relates to a power outage determination method for power system equipment, in which a plurality of power system equipment is divided into groups according to their connection states, and the presence or absence of a power outage is determined for each group. It is well known that this type of conventional power outage determination method for power system equipment is implemented in a power system calculation control system. By the way, in this power system equipment power outage determination method, power system equipment such as busbars, power transmission lines, and transformers are referred to as nodes, and each node in the power system calculation control system is assigned a node number (hereinafter referred to as node number). ) N Consistently and uniquely numbered starting from ₁ .
In addition, a group of one or more switches connected in series that connects one node (equipment) and one node (including temporary equipment) of power system equipment is called a branch, and in the power system calculation control system, Branches are consistently and uniquely numbered in order from branch number = B ₁ , each node is connected by a branch, and nodes connected according to the open/closed state of each branch are grouped into node groups, and each node is This is to determine whether there is a power outage for each group.
Note that when three or more nodes (equipment) are connected at one point via a branch, temporary equipment is defined as a relay connection point, and is referred to as a dummy node. A node number (hereinafter referred to as node number) is also given to the dummy node. By the way, the above-mentioned conventional method for determining a power outage in power system equipment has the following problems. 1. The most time-consuming part of the power outage determination process is the node grouping process. The processing time T required for this grouping is approximated by the following equation. T = (number of branches) x (average processing time for one branch) (seconds)... (1) In other words, the processing time T required for grouping
is proportional to the number of branches. For example, the time (actually measured value) required to group nodes in a system consisting of 2000 nodes and 3000 branches was approximately 90 seconds. Recently, as the scale of power grids targeted by power calculation control computer systems has increased (grids with 3,000 nodes and 5,000 branches are no longer uncommon), it has become more and more time consuming to determine power outage equipment.
As a result, the operator's recovery process for areas with power outages was sometimes delayed. 2. To speed up the power outage equipment determination process as the scale of the power system increases, divide the entire system into several smaller systems (reduce the number of nodes and branches).
However, there is also a method of performing this on a small system basis, but if the power system accident extends to the entire system, it is necessary to perform a power outage determination for the entire equipment, so it still takes time to determine the power outage equipment. 1 to 8 form the basis of the present invention. This is shown to explain the prior art. FIG. 1 is a system diagram showing the connection relationship of power system equipment. In FIG. 1, busbars 1 and 2 are connected to a power transmission line 8 via a plurality of switches 3, 4, 6, and 7 and temporary equipment 5. Here, symbols 3, 4, and 7 are disconnectors, 6 is a branch and a disconnector, B ₁ , B ₂ , and B ₃ are branches, DN ₁ is a dummy node, and N ₁ , N ₂ , and N ₃ are nodes. . _B1 is constituted by a disconnector 3 that connects the bus bar 2 and the dummy node _DN1 in series. Further, B ₂ is a branch constituted by a disconnector 4 that connects the bus 1 and the dummy node DN ₁ in series. moreover,
B ₃ is a branch that connects the dummy node DN ₁ and the power transmission line 8 in series, and is constituted by a group of switches including a wire breaker 6 and a disconnector 7 . FIG. 2 shows each such branch B ₁ , B ₂ and B ₃ ,
In other words, the power system calculation control takes in the open/close states of the switches 3, 4, 6, and 7, groups connected nodes N ₁ , N ₂ , and N ₃ , and determines a power outage in the power system. The configuration of the device 10 is shown. Power system disconnectors, on/off status information of disconnectors,
Relay operation and immobility information is periodically transmitted to a data input device 12 through a transmission circuit 11. The data input device 12 inputs information on the on/off status of the breaker or disconnector, and relay operation/non-operation information only when there is a change in the on/off status of the breaker or disconnector, or when a relay operates. , the data is transferred to the computer buffer 13, and the state change detection program 14 is activated. Next, the state change detection program 14
A current database 22 is created from the data of No. 3, and then the node grouping processing program 15 is started. The node group division processing program 15 includes a branch configuration table 16 and a device configuration table 1.
7. Using the current database 22, create the node group table 18 by dividing the nodes into electrically connected node groups (node groups) according to the processing flow shown in FIG. Here, when the program 15 finishes processing, the node group charging power outage determination program 19 is activated and creates a node group charging power outage determination table 21 based on the node group table 18, node power supply table 20, and current database 22. The data structure used for power outage determination in the power system calculation and control device 10 will be described below. The current database 22 defines the current values of the on/off states of power system disconnectors and disconnectors, and the operation and non-operation of relays, which change from time to time. The detailed configuration of the database 22 is shown in FIG. 3(). By the way, the on/off, operation, and non-operation of disconnectors, disconnectors, and relays are as follows:
In short, there are only two states, open and closed, so 1
You can define its state value simply by using bits. Therefore, the number of disconnectors, disconnectors, and relays can be defined by the number of bits that currently constitute one word in the database (Figure 3 ()).
reference). The device configuration table 17 defines where the status values of the devices (disconnectors, disconnectors, etc.) constituting the branch are currently located in the database 22 (see FIG. 3). Normally, branch B consists of a maximum of three devices, so see Figure 3().
As shown in the figure, it is only necessary to provide three types of definitions: address 171 and bit position 172 for device 1, address 173 and bit position 174 for device 2, and address 175 and bit position 176 for device 3. It is. For example, as shown in FIG. 3, the address of the device 1 is specified in the table 17 (100), and the bit position at that time is specified in the table 17 (101). The branch configuration table 16 defines nodes 163 and 164 to be connected, the number of branch configuration devices 162, and a relative address 161 in the device configuration table where these pieces of information are stored. A method for determining connection between nodes will be explained using FIG. 3. Device configuration table 1 shows the names and off state values of all devices that make up the branch for each device.
The relative word address in the current database defined in 7 and the bit position therein are taken in from the current database 22. It is determined as follows. Connection between nodes (branch included)...
Non-connection (branch disconnection) between all device input nodes and nodes...A specific example of a branch configuration in which at least one device is disconnected is shown in FIG. FIG. 4() shows the branch _B1 shown in FIG. In FIG. 1, branch B ₁ has one disconnector 3,
It connects the node N ₁ (bus 2) and the dummy node DN ₁ (temporary equipment 5), and when this is shown in Figure 4 (), the address is shown in 161a, and the number of devices is shown in 162a (the disconnector is 1). ), node N ₂ at 162c,
A dummy node DN ₁ is shown at 162d.
Similarly to the above, FIG. 4() shows the branch _B2 shown in FIG. Figure 4 () is
As above, branch _B3 is shown.
Note that 162c indicates that the branch _B3 is composed of two devices, such as the disconnector 6 and the disconnector 7. The node group table 18 shows a group of electrically connected nodes to which the node belongs.
Define the group number. In addition, the node power supply table 20 defines the address and bit position in the current database that stores the presence/absence of power to the busbar equipment and the operation and non-operation information of the busbar non-voltage detection relay installed on the busbar. ing. Furthermore, the node group charging power outage determination table 21 defines the presence or absence of power supply voltage for each node group. The operation will be explained below with reference to FIGS. 2 to 5. In FIG. 5, in step S1, the node group table NG(.) is initialized to 0. Set NNG=0 as the initial value of the node group number. Next, in step S2, a branch is constructed from the branch configuration table 16 and the device configuration table 17. The relative word addresses and bit positions in the current database 22 of all devices are determined, and the on/off status values of all devices are determined from the current database 22. The following logical operations are executed to determine whether branch B is on or off, and whether the nodes connected by the branch are connected or not. Node to node connection (branch on)...all devices on Node to node disconnection (branch off)...at least one device off.Furthermore, the process moves to step S3, and in step S3, the node to which connection is defined in the branch configuration table 16 Both NG (・) values of No. are 0
(determination of whether the node belongs to any node group). At step S3, NG (・)
If both are 0, the process moves to step S4. In step S4, branch configuration table 16
Each node defined in a node group
Set No.=NNG+1 and proceed to step S9. Also,
In step S3, if NG(・) is not 0, the process moves to step S5, and in step S5,
Determine whether one of the nodes is connected to another node group. If either is 0, the process moves to step S6. In step S6, NG
Put the node with (・)=0 (does not belong to any group) into the group of nodes with NG(・)≠0 (belongs to a certain group) and proceed to step S9.
Move to. If neither node is 0 in step S5, the process moves to step S7, where it is determined whether both nodes are in the same node group. This is determined by whether the group numbers are the same. If they are equal, the process moves to step S9; if not, the process moves to step S8. In step S8, since both nodes belong to different node groups, all the nodes of the other node are incorporated into one node group, and the process moves to step S9. In step S9, it is determined whether the processing has been completed for all branches. If not, the process returns to step S2, and if it has been completed, the process returns to END. A specific example of node grouping using such a power outage determination method will be described with reference to FIG. In FIG. 6, 31, 32, 58 and 59 are busbars, and 33, 35, 36, 37, 3
9, 40, 43, 46, 48, 51, 54, 5
5, 56, 57, 60 and 62 are disconnectors; furthermore, 44 and 47 are transformers;
4, 42, 45, 49, 52 and 61 are the cutters and disconnectors. In addition, the symbol × indicates the cut state, and the symbols ○ and □
indicates the on state. Also, B ₁ ~ _{B 14}
indicates a branch, and B ₁ to B ₁₀ indicate nodes, respectively. Table 1 shows the node numbers of the equipment shown in Figure 6.
The branch numbers are shown in Table 2. There are 10 nodes and 14 branches.

【table】

[Table] FIG. 7 is a diagram showing a simplified diagram of the connection state of FIG. 6, and the node numbers and branch numbers are as shown. In FIG. 7, the symbols represented by ○ or ● indicate nodes, and the lines connecting the ○ or ● marks and the ○ or ● marks indicate branches. A branch with an x in the middle indicates that the branch is cut. A specific example of node grouping of the models shown in FIGS. 6 and 7 will be explained using the processing flow shown in FIG. 5. In the processing flowchart shown in FIG. 5, the decision as to whether the branch is on or off in step S2 is made as shown in FIG. Also, refer to FIG. 7 for the node numbers at both ends to which the branches connect. FIG. 8 shows the transition of the node group table. Hereinafter, FIG. 6 will be explained with reference to FIGS. 5, 7, and 8. (1) In FIG. 5, in step S1, NG(·)=0 (see reference numeral 181 in FIG. 8) NNG=0. (2) At step S2, focus on branch _B1 . Branch B ₁ is off (from Figure 7), so step
Move on to S9. (3) Since all branches have not been completed in step S9, the process moves to step S2. (4) At step S2, pay attention to branch _B2 . Since branch _B2 is ON (from FIG. 7), proceed to step S3. (5) In step S3, node No.=2 and node No.=
3's NG (・) 8th (2nd and 3rd words of code 181 in Figure 8) are both 0 (see Figure 8)
Therefore, move to step S4. (6) In step S4, node No.=2 and node No.=
3, the group number is set to 1 (reference numeral 18 in Figure 8).
(Refer to 2) Next, the process moves to processing step S9. (7) At step S9, all branches are not finished, so
Move to step S2. (8) At step S2, focus on branch _B3 . Since branch _B3 is off (from FIG. 7), the process moves to step S9. (9) At step S9, all branches have not been completed, so proceed to step S2. (10) At step S2, focus on branch _B4 . Since branch _B4 is off (from FIG. 7), the process moves to step S9. (11) At step S9, all branches have not been completed, so proceed to step S2. (12) At step S2, focus on branch _B5 . Since branch _B5 is in (according to FIG. 7), the process moves to step S3. (13) In step S3, node No. = N ₁ and node No.
=N ₄ (from Figure 7) NG (・) (Figure 8 code 1
82, 1st word and 4th word) are both 0
Therefore, move to step S4. (14) In step S4, node No. = N ₁ and node No.
= _N4 is set to groove No.=2 (see reference numeral 183 in FIG. 8).Next, the process moves to step S9. (15) At step S9, all branches have not been completed, so the process moves to step S2. (16) At step S2, focus on branch _B6 . Since branch B ₆ is on (from FIG. 7), the process moves to step S3. (17) In step S3, node No. = N ₃ and node No.
NG(・) of =N ₅ (3rd and 5th words with reference numeral 183 in Figure 8) is NG(・) of node No.=N ₃
= 1, NG(・) of node No. 5 = 0, and both are not 0 (node No. = N ₃ is group No.
= 1), move to step S5. (18) At step S5, node No. = N ₅ NG (・) =
Since it is 0, move to step S6. Node No.=N ₅
Set group No.=1 (set the 5th word of NG(・) to i (reference numeral 184 in Figure 8).Next,
Move to step S9. (19) At step S9, all branches have not been completed, so the process moves to step S2. (20) At step S2, focus on branch _B7 . Since branch B ₇ is in, the process moves to step S3. (21) In step S3, node No. = N ₄ and node No.
=N ₆ (from Figure 7) NG (・) (Figure 8 code 1
84, 4th word and 6th word) are node numbers.
= NG for N ₄ (・) = 2, and node No. = N ₆ is NG
Since (•)=0, the process moves to step S5. (22) At step S5, node No.=N ₄ NG(・)=
2, the process moves to step S6. (23) At step S6, group node No.=N ₆
No.=2 (The 6th word of NG (・) is set to 2.)
Then, the process moves to step S9. In this way, the images are judged one after another, grouped, and all grouping is completed at the next step (50). (50) In step S9, since the processing has been completed for each branch, the node grouping processing is ended and the node group table 18 is created. The electrically connected node group is indicated by reference numeral 189 in FIG. 8, and is a collection of nodes with the same NG(·) value, group No.=1 to (nodes N ₂ , N ₃ , N ₅ ,
N ₇ , N ₉ ) Group No.=2~(Nodes N ₁ , N ₄ , N ₆ ,
N ₈ , N ₁₀ ). They are a group of nodes indicated by ○ (group 1) in Fig. 7, and
This is a collection of nodes indicated by ● (group 2). As described above, when the node grouping process is completed, the node group charging/power outage determination program 19 shown in FIG. 2 is started, and determines charging or power outage of the node group. This program first starts with the nodes (bus equipment) defined in the node power supply table 20.
The presence or absence of the power supply voltage is checked, and if the power supply voltage is present, the node group that includes the node is set to be charged, and if the power supply voltage is absent, the node group that includes the node is set to be in a power outage state. The presence or absence of power supply voltage at a node (busbar equipment) is determined by the operation or non-operation of a no-voltage detection relay installed on the busbar. If it is in operation, there is no voltage, so there is no power supply voltage, and if it is not in operation, there is voltage, so it is assumed that there is power supply voltage. The operation/non-operation information of the no-voltage detection relay is currently in the database 4 and can be obtained from the relative word address and bit position in the current database defined in the node power supply table 20. For all nodes defined in the node power supply table 20, the presence or absence of power supply voltage is determined, charging or power outage is determined for the node group,
The information is stored in the node group charging power outage determination table 11. Charging power outage for any node is determined as follows. Find the node group number to which the node belongs from the node group table. From the node group charging power outage determination table,
Determine charging and power outage of the node group in the above section. If it is charging, the node is determined to be charging, and if it is a power outage, the node is determined to be in a power outage. As described above, the power outage determination method has the disadvantage that it takes a long time to group the nodes. SUMMARY OF THE INVENTION An object of the present invention is to provide a power outage determination method for power system equipment that solves the problems of the prior art described above and speeds up power outage determination. In order to achieve the above object, the present invention has changed the processing of node grouping for power outage determination from the conventional branch unit to a set of series and parallel branches (hereinafter referred to as coupling factor) related to the connection state of a predetermined node. It is characterized by the fact that it is carried out as a unit. There are 3 types of connections for power equipment in the power system.
An overwhelming majority of them consist of branches. 1st
In Figure 4, the connections between buses 1 and 2 and transmission line 8 are branches B ₁ , B ₂ and B ₃ , and in Figure 15, connections between buses 31 and 32 are
Connections between the transformer 44 and the transformer 44 are defined from three each in branches B ₂ , B ₃ , and B ₆ . However, the electrical connection status of the power transmission line 8 or _the transformer 44 does not need to be determined by checking the connection status of all _three branches; for example, in _{FIG .} It can be determined by In this way, the electrical connection status of one power facility is
Multiple branches related to this judgment of contact/separation are grouped together in advance (three branches in the above example)1
It is possible to define a number of coupling factors (K in FIGS. 13 and 14), and if this coupling factor is used to perform node grouping processing for power outage determination, processing speed can be greatly improved. Embodiments of the present invention will be described below based on the drawings. FIG. 9 shows the configuration of a power system calculation control device for determining power outage of power system equipment according to the present invention,
FIG. 2 is a block diagram corresponding to the conventional FIG. 2; Components with the same reference numerals or the same reference numerals in parentheses as those in FIG. 2 indicate similar configurations and operations, and the following description will mainly focus on the differences. Information on the on/off status of circuit breakers, etc. in the power voltage system, and information on the operation and non-operation of relays are periodically input to the data input device 12 via the transmission line 11. The input device 12 transmits the data to the computer buffer 13 and starts the status change processing program 84 (14) only when there is a change in the operation of each device. The program 82 is the current database 81 (22) before the change in condition.
, create the previous database 81, and create the current database 82 from the input data of buffer 13.
After the processing, the system state creation processing program 83 is started. The program 83 uses the branch configuration table 85 (16) for the circuit breaker or disconnector that has changed.
A coupling factor table 87 is created. That is,
Create branch on/off information (table 85) from the address of the device whose status value has changed (table 82) and its branch number (device table 84),
The node to which the coupling factor to which the branch belongs is connected is determined (coupling factor table 87). Next, the node grouping processing program 88
(15) is activated. Based on the coupling factor table 87 and according to the processing flow shown in FIG. 13, each node whose connection is defined by the coupling factor is divided into electrically connected node groups.
The result is node group table 89 (19)
reflected in The node grouping process is the same as the method shown in FIG. 5 using the node grouping program 15 shown in FIG. 2, although there are differences in branches and connection factors. After the creation of the node group table 89 is completed, the node group charging power outage determination program 90 (21) is started. Node group charging, power outage determination program 90
first checks whether there is a power supply voltage for the node (bus equipment) defined in the node power supply table 91 (20), and if there is a power supply voltage, the node group that includes that node is charged, and the power supply voltage is If there is no power, the group included in that node will be out of power. A node group that does not have a bus bar is considered to be in a power outage. The presence or absence of power supply voltage for the busbar equipment is determined by the operation or non-operation of the no-voltage detection relay installed on the busbar. If it is in operation, there is no voltage, so there is no power supply voltage, and if it is not in operation, there is voltage, so it is assumed that there is power supply voltage. The operation/non-operation information of the no-voltage detection relay is currently in the database 81 and can be obtained from the relative word address and bit position in the current database defined in the node power supply table 91. The presence or absence of power supply voltage is determined for all nodes defined in the node power supply table 91, charging and power outage of the node group is determined, and the information is stored in the node group charging and power outage determination table 92 (21). A node group that does not have a power source will experience a power outage. Charging and power outage of any node are determined as follows. Find the node group number to which the node belongs from the node group table. If node group number=0, it means that the node is an isolated node, and a power outage occurs.
In the case of node group No.≠0, in the node group charging power outage determination table, if there is a power supply and voltage, it will be charged, and if there is no power supply voltage, there will be a power outage. Here, the tables used in the above embodiment will be explained in detail. The coupling factor K is a collection of branches connected in series or in parallel that exist between one facility and one facility or between one facility and multiple facilities in the power system,
FIG. 10 shows an example of the structure of a table of coupling factors K. FIG. 10 shows a specific example of the coupling factor K that defines the connection state between the bus bars 1 and 2 and the power transmission line 8 in FIG. 1. Branches of branches constituting binding factor K
Numbers shall be assigned in consecutive numbers. The branch configuration pattern number is information that defines the arrangement of the branches that make up the coupling factor K, and is used to determine the connection nodes of the coupling factor K using the branches that make up the coupling factor K. It is information. Node No. indicates the node to which the binding factor K is connected. In FIG. 1, the disconnector 4 is turned off and the bus bar 2 and the power transmission line 8 are connected, so FIG. 10 shows that node No.=2 and node No.=3 are connected. If Figure 1 is expressed using the coupling factors in Figure 10, there are three conventional branches (B ₁ , B ₂ , and B ₃ in Figure 1).
The connection between the buses 1 and 2 and the power transmission line 8 was defined by one coupling factor K (FIG. 10). For binding factor K, binding factor No.=1
A unique number is assigned consistently.
If there is no node to be combined, the node number is set to 0. The contents of the branch configuration table 85 are shown in FIG. The number of switch groups connected in series is indicated by the number of devices. The on/off status values of those devices are currently in the database 81, and their current location in the database 81 is as follows:
Defined in the device configuration table 86 (usually
The maximum number of devices is 3 (in some cases there is 1 device, in some cases there are 2 devices). Using the device configuration table relative address in the branch configuration table 85, the current location of the state value of the branch component device in the database 81 can be determined. Whether or not the node number defined in the branch configuration table 85 is connected is defined in the branch on/off information. The branch is turned on when all devices constituting the branch are turned on, and the branch is turned off when even one is turned off. The number (No.) of the affiliated binding factor K defines the binding factor K No. to which the branch belongs. FIG. 11 shows details of the device configuration table 86. It defines the location in the current database 81 where the off-state values are defined for the devices that make up the branch. Its location is indicated by the relative word address in the current database 81 where the on and off state values are stored and the bit position within that relative word address. Eleventh, the current database 81 is shown. It defines the ON, OFF, operation, and non-operation (1 bit information) of the line breakers, disconnectors, relays, etc., and the status value of each line cutter, disconnector, relay, etc. for the number of bits in 1 word. is defined. Thus, the state value of any disconnector, disconnector, relay, etc. is defined by its relative word address and bit position within that word within the current database 81 in which it is included. Equipment table (disconnector, disconnector related) 84
As shown in FIG. 12, the branch number containing the disconnector and disconnector is defined. This structure is such that the branch number to which the device belongs is determined using the relative word address and bit position in the current database where the device's on/off status values are stored. The node group table 89 defines group numbers to which electrically connected nodes belong, as shown in FIG. As shown in FIG. 12, the node power supply table 91 contains the node numbers of the buses that have power supplies, and the operation and non-operation state values of the no-voltage detection relays installed on the buses. Word addresses and bit positions are defined. The node group charging power outage determination table 92 is as follows:
Define charging and power outage information for each node group. The previous database 81 defines the state values of the power system breakers, disconnectors, and relays before the accident occurs when an accident occurs in the power system. Since this embodiment is configured and operates as described above, if the connection between power system equipment and equipment is defined by a coupling factor K, the coupling factor K is approximately 1/3 of the number of branches in the entire system. Connections can be defined. As mentioned above, the process of dividing nodes into groups using the coupling factor K is the process shown in FIG.
Since the process is basically the same as the conventional process of node grouping using branches (Fig. 5), according to the present invention using the coupling factor K, the time required for node grouping is shorter than that of the conventional branch. It is about 1/3 of that due to Although a new process for creating the coupling factor table 87 is added, the processing time is less than 1 second even if 100 disconnectors and disconnectors are changed, so it does not require much time. As described above, the present invention uses a set of series or parallel branches connected between nodes as a coupling factor, and determines the open/closed state of the coupling factor itself from the open/closed state of a group of branches in the coupled factor. The nodes connected to each other based on the open/closed states of the coupling factors are grouped into the same node group, and a power outage is determined for each of the same node groups.According to the present invention, there is an effect that the power outage determination can be made faster.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing the power system, FIG. 2 is a block diagram specifying the power system calculation and control device that is the basis of the present invention, FIG. 3 is an explanatory diagram showing the structure of the table, and FIG. Figure 5 is an explanatory diagram showing the configuration of the equipment configuration table, etc. Figure 5 is a flowchart shown to explain the operation that is the basis of the present invention, Figure 6 is an explanation showing a specific example of the power system. Figure 7 is the theoretical system diagram of Figure 6, Figure 8
Figure 9 is an explanatory diagram showing the transition of the node group table, Figure 9 is an explanatory diagram shown to explain the operation of the power system calculation control device to which the embodiment of the present invention is applied, and Figure 10 is the diagram of the coupling factor table. FIG. 11 is an explanatory diagram showing the configuration of the table used in this embodiment, FIG. 12 is an explanatory diagram of the table, and FIG. 13 is a flowchart explaining the operation of this embodiment. Chart, 1st
4 and 15 are explanatory diagrams of the power system. 1, 2... bus line, B ₁ , B ₂ ...,... branch,
N ₁ , N ₂ , ..., ... Node, 80 ... Previous database, 81 ... Current database, 82 ... Status change processing program, 85 ... Branch configuration table, 86 ... Device configuration table, 87 ... Connection Factor table, 88...Node group processing program, 89...Node group table, 90
...Node group power outage determination program, 91...
...Node power supply table, 92...Node group charging power failure table.

Claims (1)

[Scope of Claims] 1. A power system calculation control system that treats a plurality of power system equipment such as busbars and power transmission lines as nodes, and switches that connect and disconnect the equipment as branches. In a method for determining a power outage, one or more branch groups between predetermined nodes and related to the electrical connection state between the predetermined nodes are used as a coupling factor, and the coupling factor is determined from the open/closed state of the branch group within this coupling factor. Power system equipment that determines the open/close state of the connection factor, groups connected nodes based on the determined open/close state of the coupling factor, and determines that the group is in a power outage if a node in this group does not have a power source. power outage determination method.