JPH0612928B2 - Accident recovery system creation method - Google Patents

Description

The present invention relates to a method for restoring a system in which a power failure occurs due to an accident in the power system to a radial form, and more specifically, to determine a loop existing in the power failure system. The present invention relates to an accident recovery method in which a loop release point is obtained, and a switch is opened at that point to make it radial, and this is used as an accident recovery system.

[Conventional technology]

When an accident occurs in the electric power system, the re-closing relay device, automatic substation automatic operation device, etc. are used to recover the local one. However, restoration by these methods is generally a method of responding with local information of the place where the device is installed, in which the switch is turned on under the condition that the other end voltage of the switch is present and one end voltage is not present. In this method, since no consideration is given to the subordinate power outage of sound equipment that was in the connected state before the accident in the power system equipment that caused the accident, it is not possible to deal with the wide area power outage accident. ing.

For this reason, as a measure to deal with wide-area power outage accidents, the switch in the power outage system is released as a preparatory operation for recovery in the expectation that the recovery of the accident will be performed sequentially from the power supply system. Has been taken. This is because if there is a loop in the power outage system immediately after the accident, it will take time to formulate a measure to eliminate the overload when the overload is expected by turning on the power switch, and the This is a method taken to avoid the problem of pressurization.

On the other hand, a method of abolishing the recovery preparation operation, detecting a loop existing in the power outage system by a computer device, and searching for a loop open point is also considered.

[Problems to be solved by the invention]

According to the method of releasing the switch as a preparatory operation among the above-mentioned conventional examples, the switches opened by the preparatory operation for restoration must be sequentially turned on, which causes a delay in the restoration time. Further, according to the method of detecting a loop and searching for a loop open point, when the power failure system spans an adjacent power supply station or an upper power supply station, the switch of the adjacent or upper power supply station is detected for loop detection. There is a problem that it is necessary to constantly input the on / off status online, and capital investment is required to maintain the information transmission network. Furthermore, when the power system is regarded as a network and expressed as a matrix with branches (techniques ... Rows) and nodes (sections ... Columns), an enormous matrix becomes a problem, and the restrictions on the main memory capacity of the computer system and the processability become problems.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an automatic recovery system in case of an accident with good processability without requiring new capital investment for environment maintenance.

[Means for solving problems]

The present invention focuses on the secondary bus of an electric power station to determine a loop in a power outage system and has an electrical connection with the secondary bus when creating a system for accident recovery by the computer device described in the above-mentioned prior art. A set of equipment within the same voltage class (hereinafter referred to as equipment group) is used as a processing unit, and when different electric stations exist in the equipment group, it is determined that a loop exists in the group Therefore, the system is opened at the place where the tidal current before the accident was the minimum.

[Action]

With this method, for the systems under the jurisdiction of the adjacent and upper power supply stations, it is only necessary to collect the busbar information of the power stations that may have electrical connections, and when extracting the loop, the same voltage class is used. Since the equipment group inside is the processing unit, the speeding up of the processing is achieved.

〔Example〕

FIG. 1 shows a functional block of one embodiment of the present invention which achieves the above object.

In Fig. 1, 1 is a power system that is the target of automatic restoration at the time of an accident. A block that focuses on one of the grouped facilities that have an electrical connection relationship within the system that has lost power immediately after the accident. Show. Reference numeral 2 is a block for determining whether or not an unfocused equipment group exists when a plurality of equipment groups exist in the power outage system. If there is an unfocused equipment group, it is extracted as the focused equipment group. And move to three blocks. Note that the order of attention of the equipment groups of interest is in no particular order.

A block 3 is set as the highest voltage class and the voltage class of interest in the equipment group immediately after the accident of interest set in the block 1 or 2. Reference numeral 4 is a block for determining whether or not the target voltage class is the lowest voltage class in the equipment group immediately after the target accident in which the target voltage class is set to 1 or 2, and the target voltage class is not the lowest voltage class. In this case, the voltage class is lowered by one and the process moves to block 5. The block 5 has a function of focusing on the secondary bus of the voltage class in the block 3 or 4 and regarding the secondary bus in the same voltage equipment group as one bus.

Here, the same voltage equipment group is defined as an equipment group within the same voltage class when it is considered that the equipment group is divided by the voltage class by the transformer. The explanation is shown in FIG. The figure shows a substation (abcde)
Shows an example of a power system linked via a power transmission line (e.f.g.h.i.j.k.), and a switch A is cut off when an accident occurs on the transmission line h. Is shown. The set 1 of the power system equipment that has been electrically connected and has been supplied with power by opening the switch A before the accident is the equipment group immediately after the power failure and is the old target after the accident.

Immediately after the power failure, there is a power system facility with a plurality of voltage stairs in the equipment group 1 through the transformer of the substation. The equipment group 1 is divided into voltage classes and the power belonging to each voltage class is divided. Focusing on the equipment, the equipment groups 2, 3-1, 3-2 and 4 subdivided into a set of equipment having electrical connections represent the same voltage equipment group.

The same-voltage equipment group 2 is set as the voltage class of interest in the block of FIG. 1, but is excluded from the object of attention in block 5 of FIG. 1 because it is an equipment group that does not have a secondary bus.

In the block 5 of FIG. 1, the same-voltage equipment groups that are sequentially targeted for attention are shown in FIG.
1,3-2,4.

In FIG. 2, existing in the same voltage equipment group,
A set of secondary busbars 5, 6 and 7 shows a set of secondary busbars that are processed as one busbar in block 5 in FIG.

Returning to FIG. 1, reference numeral 6 is a block for extracting all the loops existing in the same voltage equipment group edited in the block 5 and the equipments forming the loops. An example of extracting a loop is shown in FIG. (A), (b), and (c) of the same figure show an example of a power system.

1-1, 1-2, in FIGS. 3 (a), (b), and (c)
1-3 show the same voltage equipment group in the power failure system, and 2
Reference numerals -1, 2-2 and 2-3 show a set of secondary bus lines considered to be the same bus line in the block 5 shown in FIG.

Loop extraction exists in the same voltage equipment group,
The primary bus of the substation is regarded as the load point of the power supply, the unit load is set, and the power flow calculation of the DC method is performed with the set of secondary buses regarded as the same bus under attention in Fig. 1 block 5 as the swing node. Extract by doing.

2-1, 2-2, 2 in FIGS. 3 (a), (b) and (c)
-3 as a thinning node and A. B. C. D point 1
Apply a unit load of 1.0 to the next bus and perform DC method power flow calculation.
The power flow value of each switch obtained as the power flow calculation result is 0.
A portion other than 1.0 and 1.0 is extracted as a switch forming a loop. That is, in FIG. 3 (a), the switches a, b, c, and (b) have the switches c, d, e, f,
In (c), g, h, i, j, k, l, m, and n are extracted as switches forming a loop.

Returning to FIG. 1, reference numeral 7 is a block for determining whether or not a loop is extracted in block 6, and if no loop is extracted, the process proceeds to block 4.

Reference numeral 8 is a block for selecting the location having the minimum tidal current value from all the equipment constituting the loop extracted by the block 6.
The power flow value handled here is the power flow value immediately before the accident. The power flow value immediately before the accident occurrence is collected by the computer system by updating and freezing the observation value stored in a constant cycle in a steady state, for example, one minute cycle, by detecting the occurrence of the accident. The observation data to be stored is the passing flow value of the switches at both ends of the transmission line.

Block 9 in FIG. 1 opens the location of the minimum power flow value selected in block 8. Here, the point where the minimum flow value is the loop open point means that when the restoration of the fault point of the power system is completed and the system configuration is restored to the system operating state before the accident,
This is because the loop injection operation is performed, and the loop cross current generated at this time is set as a candidate point that can be minimized. FIG. 4 shows an example in which the loop open points are selected in blocks 8 and 9. In FIG. 4, the switches a, b, c, d, e, f are extracted by the process of the block 6 in FIG. 1, and the pre-accident power flow value of each switch is P ₁ P ₂ P
₃ P ₄ P ₅ P ₆ is shown. These stored values P1 to P6
Then, if | P1 |> | P2 |> | P5 |> | P6 |> | P3 |> | P4 |, the point e becomes the loop open point, and | P1 |> | P2 |> | P3 | If> | P4 |> | P5 |> | P6 |, the point d is the loop open point.

Referring back to FIG. 1, reference numeral 10 is a block for determining whether or not the loop opening operation has been performed by the number of loops extracted in the block 6. If it has not been implemented yet, pay attention to the next group and loop constituent equipment, and move to block 8. Block 1 if opening operation is performed for the number of extracted loops.
Move to 1.

Reference numeral 11 is a block for determining whether or not a plurality of loops have been extracted within the same voltage equipment group of interest and the loop has been opened by the power system equipment shared by the plurality of loops. When the power system equipment group shared by a plurality of loops is opened, the process proceeds to the loop extraction processing of block 6. If not, move to block 4. The necessity of processing the block 11 is shown in FIG. FIG. 5 shows that in both cases of the two loops a and b, when the loop open point c is selected, all the loops are not opened.

〔The invention's effect〕

As described above, according to the present invention, in the event of a power system accident, in order to restore the system to a radial form, when there is a loop in the power outage system, the loop is not only under the jurisdiction of the self-power supply, Even a loop of a system under the jurisdiction of an adjacent power supply station can be dealt with by collecting system information that is monitored by its own power supply station as in the conventional case. Further, since the range for logically simulating the state of the power system is limited within the same voltage class, it is not necessary to be aware of the limitation of the main memory capacity of the electronic computer used, and there is an effect of improving the processability.

[Brief description of drawings]

FIG. 1 is a functional block diagram for explaining an embodiment of the present invention, FIG. 2 is a diagram showing an example of a system configuration for explaining an equipment group and a same voltage equipment group, and FIG. 3 is an example of extracting a loop. FIG. 4 and FIG. 4 are diagrams showing examples of selecting loop open points, and FIG. 5 is a diagram showing an example in which all loops are not opened even if one loop is open when a plurality of loops exist. a: Blackout facility group immediately after the accident, b: Same voltage facility group, c: Secondary busbar group regarded as the same busbar.

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Shigeru Iizuka 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Co., Inc. (72) Hiroshi Oda 1st, Toshiba-cho, Fuchu-shi, Tokyo Toshiba Fuchu, Ltd. In-house (72) Inventor General Inoue 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. Omika-factory (72) Inventor Takenori Kasuya 1-2-1 Wadazaki-cho, Hyogo-ku, Hyogo Prefecture No. Mitsubishi Electric Co., Ltd.

Claims (1)

[Claims] 1. An automatic recovery system at the time of an accident, which automatically detects a power system accident based on the operation information of switches and relays, determines a faulty facility, and automatically restores the system that has lost power due to the system accident to a radial system. Then, when determining the release point for releasing all the loops in the power outage system, the loop judgment is started from the secondary bus bar of one electric station and directly to the secondary bus bar of another electric station or to another electric station. The case where there is a secondary busbar connection line that is connected to a power outage via the primary busbar of the location is determined as a loop, and the location where the pre-accident power flow is the smallest in the loop is saved in advance. A system creation method for accident recovery, which is characterized by extracting the power flow distribution of the pre-accident system by searching and using that point as the loop release point.