JPS6251063B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a system configuration display device for an electric power system, and more particularly to a method for displaying a system configuration in a simplified electric power system by integrating nodes. When grasping the connection status of a power system and calculating the power flow of each branch and the voltage at each node, the connection status changes due to the opening and closing operations of many disconnectors and disconnectors. When the system configuration is displayed in units of devices such as disconnectors and disconnectors, these devices become branches and their end points become nodes, which increases the memory capacity and calculation time required for the power flow and voltage calculations mentioned above. There is a drawback. An object of the present invention is to eliminate the above-mentioned drawbacks by using the minimum necessary nodes and branches in consideration of the collection of devices as base data, and simplifying the system configuration based on this. To this end, in the present invention, nodes and branches are defined as described later, and are divided into zero impedance branches and non-zero impedance branches, and when the former is in a connected state, that is, when it is on, the start and end nodes of that branch are They are integrated and simplified as if they are in the same node. Figure 1 shows the configuration of the power system.
Generator G1 of electric station S1 is connected to bus line N1, and generator G2 of electric station S2 is connected to bus line N2. Moreover, the load L1 of the electric station S4 is connected to the bus line N5, and the load L2 of the electric station S5 is connected to the bus line N6. Electrical station S3 functions as a switching station connecting electric stations S1, S2, S4, and S5. Lines BR1, BR2, BR3, connecting electrical stations
BR4 has line impedance Z1, Z2,
It has Z3 and Z4. Bus bar N of electric station S3
3, N4 and the busbars N1, N2, N5, N of each electric station
6 is connected by a circuit breaker CB and a disconnector LS provided on each line. In the figure, ● represents a closed circuit state of the disconnector, ○ represents an open state of the circuit breaker, ■ represents a closed state of the circuit breaker, and □ represents an open state of the circuit breaker. In this system, each line BR1, BR2, BR
3. Let's consider the case of calculating the power flow of BR4. FIG. 2 shows a specific example in that case. However, since the power flow calculation itself is generally known, it is omitted. In power flow calculations, memory capacity and calculation time can be reduced by displaying the system configuration in FIG. 1 in a simplified manner as shown in the display screen 310 in FIG. 2. In the present invention, this simplification process is performed by the computer 200 shown in FIG. The system configuration in Figure 1 changes in various ways depending on the opening/closing status of the circuit breaker CB and disconnector LS, but if the nodes and branches are defined as shown in Figure 3, it is a simplified representation that can be applied to any change in the system configuration in Figure 1. is possible. Nodes and branches are defined as follows. (i) Node definition: All buses and switching end points of all lines where bus switching is performed are defined as nodes, and node numbers are set for these. Therefore, the bus lines N1, ......, N6 in Fig. 1
is a node. Furthermore, the switching end points a, b, c, and d for switching and connecting the buses N3 and N4 are also nodes. (ii) Definition of branches: All lines, all transformers, all bus connection lines, and equipment connecting the bus switching end point and the bus are defined as branches, and branch numbers are assigned to these. Therefore, the lines BR1, . . . , BR4 and the busbar connection line T in FIG. 1 are branches. In addition, disconnector LS
4 or LS5 connects the nodes. By setting the node numbers and branch numbers in this manner, the system configuration shown in FIG. 1 can be managed as base data as shown in Table 1. The starting node (NF) of branch (1) is and the terminal node (NT) is .
Further, the impedance of that branch is Z1, that is, non-zero. Therefore, the zero/non-zero classification is set to 1. The branch-on condition is a condition under which the connection between the start node and the end node is established. The conditions for establishing branch (1) are (CB1)・(CB2)・(LS1)・(LS2)・(LS3)=1. Here, * represents logical product. That is, the circuit breaker CB described in the branch-on condition section,
When all disconnectors LS are closed, the branch is
This will connect NF and NT. A branch in this state is called an on-branch. On the other hand, a branch when the branch-on condition is not satisfied is called an off-branch. Branch (5) connects the node and its impedance is zero. Therefore, the zero/non-zero classification is set to zero. This branch is disconnector LS4
becomes on-branch when is in a closed circuit state. branch
(9), that is, the bus line T in FIG. 1 connects nodes, and its impedance is zero. This branch includes circuit breaker CB3 and disconnector LS8,
When all LS9s are in a closed circuit state, the branch becomes on-branch. The base data in Table 1 is stored in base data file 210 in FIG. In FIG. 2, the open/close states of circuit breakers and disconnectors are calculated by computer 2 as online system configuration data 100.
00, the conditions for establishing the branch on condition described above are determined by the branch connection state determination unit 220, and a branch connection state file 230 is created. In the opening/closing state of the circuit breaker and disconnector shown in Fig. 1, the memory contents of the branch connection state file are
It will look like the table. In Table 2, branch (5) ~
(13) is a zero impedance branch as shown in the base data in Table 1. Among these zero impedance branches, branch (5),
(7), (9), (11), and (13) are on-branch. Since these five branches are zero-impedance branches and on-branches, node integration (the start node and the end node become the same) occurs due to these branches. That is, the second
The stored contents of the table branch connection status file and the first
When merging nodes using the base data of the table, the node is integrated by branch (5), the node is integrated by the next branch (7), the node is integrated by the next branch (9), and so on.
The next branch (11) integrates the nodes, the next branch (13) integrates the nodes, and finally the nodes are integrated. Here, the connections above the numbers represent nodes that are newly integrated by the branch, and the connections below the numbers represent nodes that have already been integrated.
On the other hand, non-zero impedance branches (1), (2), (3),
In (4), even if the node is on-branch, there is impedance between the nodes, so node integration does not occur. Note that, of course, node integration does not occur depending on off-branch (6), (8), (10), and (12). Therefore, the system configuration shown in FIG. 1 is simplified as shown in FIG. 4. Here, Δ1 to Δ5 are newly assigned node numbers. This node integration process
This is performed by the node integration processing unit 240 shown in the figure.
The flow diagram is shown in FIG. The blocks are shown here corresponding to those of FIG. The node integration processing unit 240 includes the isolated node determination unit 24
1. System separation determination unit 242, node integration unit 24
3, and a new node numbering section 244. The isolated node determination unit 241 excludes nodes that are not connected to any on-branch as isolated nodes. The system separation determining unit 242 groups all nodes while setting the same system number to nodes connected by on-branch. If all nodes are grouped under the same system number, system separation will not occur, and if all nodes are grouped into multiple system numbers, system separation will occur. The node integration unit 243 integrates nodes for each of the above systems. The integration proceeds while setting the same number (for example, the younger node number) to the start node and the end node of the zero impedance branches that are turned on. For nodes that are not integrated, set the original node number. The new node numbering unit 241 sets a new series of node numbers for the discrete node numbers set by the node integration unit 243. As described above, the results of the integration performed by the node integration processing unit 240 as shown in FIG. 4 are stored in the new node file 250. The stored content is a correspondence table between the original node number and the newly assigned new node number, as shown in Table 3. A series of new node numbers are output and edited by the display output editing section 260 shown in FIG. 2, and output to the CRT display device 300 as shown in FIG. 4.
Instead of outputting to the CRT display device 300, it may be directly linked to a power flow calculation processing section or the like (not shown) provided separately inside the computer. As described above, according to the present invention, the system configuration can be displayed or calculated in a simplified manner, which is effective in reducing memory capacity and calculation time. In the present invention, nodes are integrated only for zero impedance branches to obtain a simplified system, but if nodes are integrated regardless of zero or non-zero impedance, system separation can also be determined. That is, when nodes are integrated regardless of zero or non-zero impedance, if all original node numbers are integrated into one integrated node number, no disconnection occurs. In contrast,
If multiple integrated node numbers occur, system separation has occurred. In this way, the present invention can also be applied to discrimination of lineage separation.

【table】

【table】

[Table] Code integration occurs.

【table】

【table】 [Brief explanation of the drawing]

Fig. 1 is a system configuration diagram of an electric power system, Fig. 2 is an embodiment of the present invention, Fig. 3 is an illustrative diagram of the system configuration representation of the present invention, and Fig. 4 is a simplified system of Fig. 1 according to the present invention. FIG. 5, a diagram illustrating the configuration, is a flow diagram of the node integration processing section of the present invention. G... Generator, L... Electric charge, Z... Impedance, LS... Disconnector, CB... Circuit breaker, N... Bus bar, BR... Line, S... Electrical station.

Claims (1)

[Claims] 1. In displaying a power system configuration consisting of multiple nodes and multiple branches, for each branch, store its starting node, terminal node, and a classification signal indicating whether each branch has zero impedance or non-zero impedance, and A branch with zero impedance is detected from a stored signal, and if the branch is an on-branch in a connected state, the start node and the end node of the branch are integrated into the same node to form a system. A system configuration display method in an electric power system.