JPH0256014B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection state determination method for determining the connection state of a plurality of facilities in an electric power system at high speed.

Conventionally, as a method of this type, there has been an indication determination method as shown in FIGS. 1 to 3. In Figure 1, 1 is a bus bar, 2 is a transformer, 3 is a transmission line, 4 is a load device, and 5 is a
is a switch. The connection state of the power system is changed by switching a switch 5 between a plurality of buses 1, transformers 2, power transmission lines 3, and load devices 4, which are power system equipment. .

Figure 2 is a graphical representation of the power system diagram shown in Figure 1.
Reference numeral 6 represents a node, and here, the power system equipment shown in FIG.
A number for identifying the equipment is attached within the frame of each circle corresponding to the load device 4. Further, 7 represents a branch, which corresponds to the switch 5 in FIG.

FIG. 3 shows an example of a computer determination device that determines the connection state of the power system described above. In the figure, 1
1 is a central processing unit, 2 is a storage device, and 3 is a graph representation device for the electric power system, and there are symbols 4-1 and 4.
-2...4-i stores and records the branch number assigned to each branch, the node number connected to both ends, and the branch connection state. Therefore, branch columns 4-1, 4-2...4-
There are as many i's as there are branches, and a graph representation is performed. Next, the operation in such a configuration will be described. First, the computer determination device determines only one reference node, checks whether a branch connected to that node is connected or disconnected, and determines a connected node with a distance of 1. Therefore, the connected/unconnected state of that branch is stored as data, and then this connected state is checked from the detected node to the connected/unconnected state of another branch connected to that node. A node with a distance of 2 is detected, and its connected/unconnected state is stored as data.

Perform this operation along all nodes,
This operation is repeated until the connection status of all system equipment is determined. All these operations are performed by the central processing unit 1 shown in FIG. 3 according to a program based on the graph representation device 3 and branch data 4 in the storage device 2.

Since the conventional connection state determination method is performed as described above, when a branch changes its connected/disconnected state, the entire target power system must be re-determined accordingly. However, the time required for this determination usually increases in proportion to the square of the number of nodes, so as the power system subject to determination becomes larger, the time required to complete the determination for the entire system increases. The drawback was that it grew too wide.

This invention was made to eliminate the drawbacks of the conventional system as described above, and instead of representing the entire power system as a graph at once as in the conventional method, it divides the power system into multiple blocks. The object of the present invention is to provide a power system connection state determination method that quickly completes the determination process by graphically representing each block and determining only the block to which the branch belongs as the state of the branch changes.

An embodiment of the present invention will be described below with reference to the drawings. In Figure 4, 1 is the busbar, 2 is the transformer,
3 is a power transmission line, 4 is a load device, 5 is a switch, 8-
1, 8-2, and 8-3 indicate blocked division blocks. Further, FIG. 5 is a graph representation of the power system diagram shown in FIG. 4, where 6 represents a node and 7 represents a branch. This example shows an example in which the entire power system is divided into three blocks, and the classification criteria is to extract equipment such as bus 1 and transmission line 3 that can be electrically connected at the same voltage, and to This is done by dividing them into the same voltage block. The transformer 2 is included in the voltage block to which its secondary side belongs. Therefore, each of the same voltage blocks is connected by the primary side switch 5 of the transformer 2, and the branch formed by this switch 5 is particularly called the whole system connection determination branch 9. I'll decide.

FIG. 6 shows a block graph representation of the electric power system shown in FIG. 5 for each divisional block. Each division block 8-1, 8-2,
8-3 mutual system-wide connection determination Branch 9 connection/
The determination of the disconnection state is performed in exactly the same way as the determination between node 6 and branch 7 in FIG.

FIG. 7 shows a computer determination device that determines the connection state of a power system divided into division blocks. In the figure, 1 is a central processing unit, 2 is a storage device, and 3-
1, 3-2, . . . 3-i correspond to the same voltage blocks 8-1, 8-2, 8-3, . . . in FIG. 5 or 6. It is a block graph representation. Further, 4-1-1, 4-1-2...4-1-n represent n branch data within the same voltage block 8-1, and similarly 4-i-j represents the block graph representation 3. -i shows j branch data, and the content of each data information is the same as the conventional one shown in FIG. 5-1, 5-2,...5-i
is the branch corresponding to system-wide connection judgment branch 9.
The connection state of each branch 9, the node number connected to both ends of the branch 9, and the same voltage block number connected to both ends of the branch 9 are stored as data.

The operation of this embodiment configured as described above is as follows. First, if there is a change in the connection state of a branch other than the all-system connection branch in any of the divided blocks in Figure 5, the connection/disconnection state is determined within the same voltage block to which that branch 7 belongs. will be held. The determination method at this time is the same as the conventional determination procedure described in FIGS. 2 and 3.

Next, as shown in FIG. 6, the connection state of the entire power system is determined. That is, the connection state of the system-wide connection determination branch 9 is determined for each block in relation to the same voltage block to which the nodes 6 at both ends of the branch belong. Therefore, when a change occurs only in the connection state of the whole system connection judgment branch 9, the connection state is not judged within each same voltage block, and the same voltage block to which both ends of the branch 9 belong is changed on a block-by-block basis. The connection status is determined between the two.

The above-described determination process is performed using graph representations 3-1, 3-2...3-i and branch data 4-1-1 created by the central processing unit 1 for each voltage class stored in the storage device 2, as shown in FIG. . . 4-ij and information 5-1, 5-2 . . . 5-i of the system-wide connection determination branch according to a program.

In this embodiment, an example has been described in which the power system is divided into three identical voltage blocks, but as is clear from the description in FIG.
It is clear that there is no need to limit the number to three, and any number of two or more may be used.

As described above, according to the present invention, the power system is divided into the same voltage blocks and represented graphically.
First, the connection status of the branch is determined for each segmented block, and then the connection status of the entire power system is determined for each segmented block as one unit by the whole system connection determination branch, so the time required for this determination is compared to the conventional method. This has the effect of making it possible to determine the connection state at high speed, and the larger the power system is, the more advantageous it becomes.

[Brief explanation of drawings]

Figures 1 to 3 are explanatory diagrams showing conventional connection state determination methods, in which Figure 1 is a configuration diagram of power system equipment, Figure 2 is a graphical representation of the power system equipment, and Figure 3 is a diagram showing the configuration of power system equipment. The figures each show a computer judgment device for the power system equipment. 4 to 7 are explanatory diagrams showing a method for determining the connection status of an electric power system according to an embodiment of the present invention. FIG. 6 shows a graphical representation of the power system equipment, FIG. 6 shows a block graph representation diagram for each block classification, and FIG. 7 shows a computer determination device for the power system equipment. 1... bus bar, 2... transformer, 3... power transmission line, 4
... Load device, 5 ... Switch, 6 ... Node, 7
... Branch, 8 ... Same voltage block or divided block, 9 ... Whole system connection judgment branch. In addition,
The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] 1. In a method for determining the connection state of a power system in which a plurality of power system facilities are formed by switching operations of a plurality of switches, the power system is connected to a plurality of identical voltage blocks for each of the power system facilities that operate at the same operating voltage. A method for determining a connection state of an electric power system, characterized in that the system is divided into two groups, and performs high-speed determination processing by determining only the same voltage block to which the switch belongs according to the state of the switch.