JPH0691709B2 - Accident facility determination method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an automatic determination system for a power system fault facility by a power system control computer.

[Conventional technology]

Conventionally, the equipment that causes an accident in a power system accident (hereinafter referred to as an accident equipment) is determined by using the protection range data of the activated protection relay in the jurisdiction system and the trip information of the breaker. However, the protection range of the activated protection relay depends on the open / close state of the switches (gates, disconnectors, disconnectors) within the protection range of the activated protection relay, so it takes a long time to judge the accident equipment. It was Furthermore, when a power failure due to an accident occurs at a plurality of locations in the jurisdiction system at the same time, the judgment of the accident equipment becomes complicated and a high degree of skill is required for the judgment.

[Problems to be solved by the invention]

In the present invention, in order to achieve more stable supply of electric power due to the above-mentioned conventional problems and the enormous size and complexity of electric power system equipment, it is desired to speed up recovery operation at the time of an accident and improve reliability. In view of the above, it is an object of the present invention to provide a method for achieving a high-speed and high-reliability determination of an accidental facility in a jurisdiction system which is the basis for determining the restoration operation.

[Means for solving problems]

The purpose of the above is the system status before the system accident (power failure equipment group, switch status, protection relay operation information, etc.) and the system status immediately after the system failure (power failure equipment group, switch status,
A collection of unit equipment (electric power failure equipment group) that is electrically connected to each power equipment of the system to which the switch that tripped at the time of the accident in the charging system immediately before the accident occurred Create and further trip CB
Adjacent power outage equipment groups are connected via one to form one power outage equipment group group, and power outage equipment other than this power outage equipment group group is made to be one power outage equipment group group, and each power outage equipment group group is also imported. This is achieved by including the operation information of the protection relay that has operated, and further by editing the operation protection relay in consideration of the operation characteristics.

[Action]

Each equipment that constitutes the power system is protected by a protection relay to prevent the spread of accidents. The protection relay protects the equipment by various methods. Therefore, when an abnormality is detected (current magnitude, direction, voltage magnitude change, etc.), the switch of the equipment to be protected is opened and the fault current flows. It is designed to turn down. In other words, depending on the protection relay, the operating direction from the protection range (direction in which an abnormality has occurred)
There are things you can know. Although there is a protection relay whose operation direction is unknown, it is possible to determine the abnormal direction by combining it with the switch opening information from the above-mentioned function of the protection relay. The protection relay operation information and switch operation information captured by the computer are accumulated in time series, and the information within a fixed time is edited for each power outage equipment group group described above, and the characteristics of the protection relay described above are By applying it, it is possible to determine the accident equipment.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram showing the configuration of a power system calculation control system of the present invention. Reference numeral 1 is a jurisdiction system, 2 is an online information input device, 3 is an electronic computer, 4 is a current system state storage unit, 5 is a system state storage unit immediately after an accident, 6 is an accident equipment determination processing unit, and 7 is a display unit.

The online information input device 2 stores the state information of the switches of the jurisdiction system 1 and the operation information of the protection relay in the current system storage unit 4 in the electronic computer 3 at a constant cycle. When an accident occurs in the jurisdiction system 1 and the protection relay operates, the contents of the current system state storage unit 4 are transferred to the system state storage unit 5 immediately after the accident and stored in the state storage unit 5 immediately after the accident. With respect to the power system, the accident equipment determination processing unit 6 using the method of the present invention determines the accident equipment, and the display unit 7 notifies the operator of the result.

FIG. 2 shows the processing sequence of the method of the present invention by the processing steps S1 to S5. The individual processes will be described below. First, the step S1 accumulates a change in the status of a certain time (for example, 10 seconds) from the jurisdiction system that occurs at the time of an accident, that is, a change in the operation information of the protection relay and the breaker non-voltage detection relay.

Next, in step S2, a power failure equipment group is created by the following two procedures.

First, the unit equipment (bus, transmission line, transformer, etc.) that constitutes an electric power system that is electrically connected via a "closed" switch using the operation information of trips and disconnectors in the storage condition. ) Reorganize the equipment group that is a set. Next, the operation information of the no-voltage detection relay in the accumulated state is used to determine the equipment group in the power failure state, and the equipment group is set as the power failure equipment group.

Next, in step S3, the power failure equipment groups created above are combined with each other through a switch that trips to combine adjacent power failure equipment groups into one power failure equipment group group. In addition, the other power outage facility groups are grouped together to form a power outage facility group group.

FIG. 3 is an example showing a relationship between a power outage facility group and a power outage facility group. (1) to (10) in the figure are branch numbers assigned to each unit of equipment of the transmission line and transformer,
~ Are node numbers given to each unit of equipment on the bus, and G1 and G2 are external power supplies.

Assuming that the switches at both ends of the branch trip due to the accidents of the branches (1) and (2) (corresponding to the transmission line route accident) as shown in Fig. 3, the equipment in the diagram excludes the nodes. Becomes In this embodiment, the power outage facility group is four groups as shown in Table 1 (a) below, and the power outage facility group group is two groups as shown in Table 1 (b) below. By thus connecting the power failure equipment groups by the trip switch information, the accident equipment determination processing described below can be facilitated and the processing time can be shortened.

Next, in step S4, the operation information of the protection relay is extracted from the accumulated state changes and edited for each power outage group group. That is, first, by classifying the operation information of the protection relay into the operation information of the main protection relay and the backup protection relay, then by comparing the operation location on the power system of the protection relay and the power failure equipment group group, Edit the operation information of the protection relay for each power outage group group. Of the protection relay operation information on the boundary of the power failure equipment group group, the operation information of the main protection relay is edited on the power failure equipment group group side to which the protection equipment of the protection relay belongs, and the operation information of the backup equipment protection relay is Edit it on the side of the power failure equipment group to which the switch tripped by the protection relay operation belongs.

In addition, backup protection relays are classified into those with protection direction characteristics and those without protection direction characteristics, depending on the characteristics of the relay. In other words, the distance relays (DZ ₂ , DZ ₃ ) etc. for the second and subsequent stages for the protection of back-up equipment include not only the unit equipment but also a plurality of equipment connected to the unit equipment, and have a protection direction characteristic. To call. On the other hand, a protection relay such as an overcurrent relay (OC) that operates as a logical sum of a plurality of unit equipments is referred to as having no protection direction characteristic.

Table 2 below shows an example of the classification of the main protection relay and the backup protection relay.

Lastly, the accident equipment and the accident candidate equipment are determined by using the operation information of the protection relay edited for each power outage equipment group group in step S5.

Next, details of the accident facility determination process will be described.

As a result of extracting the operation mode of the protection relay on the boundary of the power outage equipment group group and the operation mode of the protection relay as the determination method when various accidents occur in the power system, the operation information of the protection relay is shown in relation to the accident equipment determination processing. Shown in.

The main protection relay (hereinafter abbreviated as M.Ry) covers one facility and the backup protection relay (hereinafter abbreviated as B.Ry) covers two or more facilities. For example, a so-called second stage of a distance relay used as a protection relay for a power transmission line not only sets the transmission line in which the protection relay is installed as a protection range, but also the electric power of the other end of the transmission line. Station (departure substation)
The protection range is up to about half the total length of the other transmission lines connected to.

In the “conceptual diagram” in FIG. 4, 101 represents a power failure same-voltage equipment group, 102 represents an accidental equipment, and 103 represents an estimated accidental equipment. Also, 111 is the main protection relay operation skipping breaker trip information, 112 is the backup protection relay (with direction characteristic) operation skipping and disconnection trip information, 113 is the backup protection relay (without direction characteristic) operation skipping and disconnection. Indicates instrument trip information.

The accident facility determination method shown in FIG. 4 will be described below.

(1) When there is M.Ry operation When there is M.Ry operation within the power outage facility group, the M.Ry
Equipment within the scope of protection is judged to be accident equipment. Also, if there is B.Ry operation in addition to M.Ry operation, B.Ry operation is ignored and
Equipment within the protection range of M.Ry is judged as accident equipment.

(2) For B.Ry operation only When the operation relay in the power failure equipment group group is B.Ry only, B.Ry operation with protection direction characteristic and no protection direction characteristic
Mixed B.Ry with and without B.Ry operation and protection direction characteristics
Classified as behavioral.

First, in the case of B.Ry operation with the protection direction characteristic, it operated
It is judged as follows depending on whether or not all of B.Ry face the inside of the power outage equipment group. That is, B.
If all of Ry faces the inside of the group group, all the equipment in the group group are assumed to be accidental equipment. Meanwhile, it worked
If even one of B.Ry faces the outside of the group, it is determined that there is no accident equipment or estimated accident equipment in the group.

Next, in the case of B.Ry operation without protection direction characteristics, all equipment in the group group is assumed to be accident equipment. When B.Ry operations with and without protection direction characteristics coexist, the above protection direction characteristics exist depending on whether all B.Ry with protection direction characteristics face the inside of the power failure equipment group group. B.
The same judgment as in Ry operation is performed.

FIG. 5 is an example of a case where a power failure due to an accident occurs at multiple points in the jurisdiction system at the same time. (1) to (15) in the figure
Is a branch number given to each unit equipment of transmission lines and transformers, is a node number given to each unit equipment of bus lines, and G1, G2, G3 are external power sources. Assuming that an accident has occurred in both branches (5) and (13) as shown in the figure, the shaded area (R1, R2 ...) in the figure causes a power outage, and the power outage group is R1, R2. , R3, R4, R5, R6 6
It becomes one. Here, the power outage equipment group group is {R1, R3}, {R
There are three, 5, R6} and {R2, R4}. {} Represents a set of power failure equipment groups, that is, a power failure equipment group group.
Assuming that the main protection relay of Franch, which assumed an accident, operated normally, the main protection relay was edited on both boundaries of the power outage facility groups R1 and R5, and the power outage facility group unit {R
Accident facility determination is performed using the operation information of the protection relay edited in 1, R3}, {R5, R6}. Since the protection relay operation information is not edited except for the power outage equipment group group {R1, R3}, {R5, R6}, it is not necessary to be the target of the accident equipment determination processing. For the power outage group group {R1, R3},
Main protection relay information with branch (5) as protection equipment
Using M ₁₁ and M ₁₂ , it is determined that the faulty facility is branch (5). For the power failure equipment group group {R5, R6}, main protection relay information M ₅₁ , M whose branch (13) is the protection equipment
₅₂ is used to determine that the faulty facility is branch (13).

Although only the protection relay operation is described in this example, it is clear that even in the case of the backup protection relay operation, the determination is made according to the determination method of FIG.

〔The invention's effect〕

As described above, the accident equipment determination method of the power system equipment according to the present invention accumulates a change in a certain time from the jurisdiction system that occurs at the time of an accident, recognizes a set of power outage equipment due to an accident as a group, and further This power outage equipment group is connected by a trip switch to create a power outage equipment group group, and the main protection relay operation information and backup protection relay operation information at the boundary and inside of the power outage equipment group group are edited, and this power outage equipment group unit Since the accident equipment is judged, the reliability of the judgment is improved, and the judgment of the accident equipment in a wide area system can be performed at high speed. In addition, it is possible to easily and surely determine a faulty facility even if there is a power outage facility due to an accident that has occurred at multiple locations at the same time.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of an embodiment of the present invention, FIG. 2 is a flow chart diagram showing the principle of the present invention, and FIG. 3 is a diagram showing a power outage facility group and a power outage facility group group which are features of the present invention. FIG. 4 is a diagram showing a relationship example, FIG. 4 is a diagram showing a basic concept of the accident facility determination method, and FIG. 5 is a diagram showing an application example of the present invention. 1 ... Jurisdiction system, 2 ... Online information input device, 3 ... Computer, 7 ... Display unit.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Moriyoshi Nagahama 1-3-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Company (72) Inventor Hiroshi Kabazawa 1st Toshiba Town, Fuchu, Tokyo Toshiba Corporation Inside the Fuchu Factory (72) Inventor Mamoru 5-2-1 Omika-cho, Hitachi City, Ibaraki Hitachi Ltd. Omika-Factory, Ltd. (72) Inventor Susumu Watanabe 1-1 1-1 Wadazaki-cho, Hyogo-Kobe, Hyogo Prefecture No. 2 Mitsubishi Electric Corporation Control Works (56) Reference JP-A-57-71225 (JP, A)

Claims (2)

[Claims] 1. A faulty facility of a power system for periodically determining the faulty facility at the time of an accident while accumulating the system state by periodically incorporating the operation information of the protection relays and switches in the power system into the power system calculation control system. In the determination method, for each power equipment of the system to which the switch tripped at the time of an accident, the power equipment in an electrical connection relationship is determined using the operation information of the tripped switch to create a power equipment group, and For each power equipment group, determine the power failure equipment group that is out of power from the status information of the non-voltage detection relay of the equipment to which it belongs, and when there are multiple power failure equipment groups, the power failure equipment groups that are adjacent to each other via the tripped switch Is determined as one power outage equipment group, and based on the operation information of the main protection relay and the backup protection relay for each power outage equipment group. Fault facility determination method of the power system, characterized in that so as to determine the fault facility outage equipment in the group Te. 2. In claim 1, when the main protection relay operates, the protection equipment of the relay is regarded as an accident equipment, and only the backup protection relay is operated and the protection characteristic is outward. A power system accident equipment determination method characterized by determining that there is no accident equipment in the power outage group.