JP2965738B2 - Power system monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system monitoring device for estimating the nature of an accident that has occurred in a power system.

[0002]

2. Description of the Related Art When an accident occurs in an electric power system, various protection devices work to protect the equipment in which the accident occurred, and to minimize the scope of the accident. The power system changes. As described above, if there is a change in the power system due to an accident, it is necessary to estimate the content of the accident, and therefore, conventionally, knowledge about the relationship between the state of the power system after the accident and the accident has been used. FIG. 13 shows a configuration example of a conventional power system monitoring device for estimating the content of an accident.

[0003] As shown in the figure, state change data from a power system is transmitted to a computer 4 via a transmitting station 2 and a receiving station 3.
It is input to the state change monitoring means 42 inside. Equipment data storage means
41 stores equipment data in advance. The accident content estimating means 44 is a means for storing the data of the condition changing
The accident contents are estimated using the data of 41 and the knowledge base stored in the knowledge storage means 43, and the result is displayed on the display device 5.
Output to

[0004]

As the power system tends to become more and more complicated, it is necessary to further increase the reliability of the power supply. Therefore, a plurality of protection devices are taking on more complicated coordination. For this reason,
It has become impossible to uniquely determine which protection device has opened the circuit breaker in the monitored system. For example, FIG.
In the case where an accident occurs in the B # 1 bus of the power system, the conventional power system monitoring device shown in FIG. 13 outputs a display of the estimation result as shown in FIG.

In such a case, it is necessary to correctly recognize the actual state of the power system in which the respective protective devices have operated, and it is difficult to estimate the details of the accident only from the data of the state of the power system after the accident, and the technology is still established. Absent. The present invention has been made in view of the above circumstances, and in consideration of a power system state in the middle of a case where a plurality of protection devices operate continuously, a power system monitoring device capable of estimating the content of an accident. It is intended to provide.

[0006]

A structure for achieving the above object will be described with reference to FIG. 1 corresponding to an embodiment. The present invention relates to an equipment for storing power system equipment data including state data of a monitored system. A data storage unit 41, a state change monitoring unit 42 that constantly monitors state change data including a state change time sent from each equipment of the monitored system, and updates the equipment data storage means 41; A system that reproduces the state of the power system based on the time-series state change data of the relay and the circuit breaker due to the operation time of the relay when the state change continues from the data and the contents of the equipment data storage means 41. State reproduction means 45, knowledge storage means 43 for storing knowledge about the relationship between the power system state at the time of the accident, state change data and the accident, and contents of the equipment data storage means 41 and system state reproduction means 45 Was An accident content estimating means 44 for estimating the contents of the accident from the power system state at the time of the accident, the state change data, and the contents of the knowledge storage means 43.

[0007]

The state change data input from the monitored system is stored in the facility data storage means 41 by the state change monitoring means. The accident content estimating means 44 creates requirements for the system state reproducing means 45 using the contents of the equipment data storing means 41 and the knowledge stored in the knowledge storing means 43. That is,
When there is a request, the system state reproducing means 45 reproduces the power system state at the time of operation of the relay from the state change data and the contents of the facility data storage means 41. On the other hand, the accident content estimation means 44 estimates the content of the accident using the power system state created by the system state reproduction means 45, the contents of the facility data storage means 41, and the knowledge stored in the knowledge storage means 43. .

[0008]

An embodiment will be described below with reference to the drawings. FIG.
1 is a functional block diagram of an embodiment of a power system monitoring device according to the present invention. In FIG. 1, 1 is a power system, 2 and 3 are information transmission devices between the power system 1 and a computer 4 described later, 2 is a transmitting station from the power system 1 to the computer 4, and 3 is a receiving station. Bureau. Reference numeral 4 denotes an electronic computer for estimating the nature of the accident based on the status of the power system 1 obtained via the transmitting station 2 and the receiving station 3. Reference numeral 5 denotes a display device for displaying the details of the accident estimated by the computer 4.

Also, in the computer 4, 41 is a facility data storage means for modeling the power system 1 and further storing the situation, 42 is a state of the power system 1 input and stored in the facility data storage means 41, Also, an accident content estimating means described later
Status change monitoring means for passing the status change data to 44, knowledge storage means 43 for storing knowledge about the estimation of accident contents, 44 status change data and equipment data storage means 41 created by the status change monitoring means 42
Of the accident that estimates the contents of the accident from the modeled contents of the electric power system 1 stored in the storage unit, the accident contents estimation knowledge stored in the knowledge storage unit 43, and the electric power system created by the system state reproduction unit described later. Estimating means 45 is a system reproducing means for reproducing the electric power system necessary for the accident content estimating means 44 to estimate the content of the accident. FIG. 2 is an example of a power system that is a monitored system.

FIG. 3 shows equipment data storage means 41 in the case of FIG.
FIG. The first data in FIG. 3 indicates that the equipment installed in the A substation is A # 1 bus, A-1CB and A-2C.
B. In addition, the sixth data in FIG. 3 shows that A-1CB at A substation has AB # 1L transmission line and A #
One bus is connected, and the installed relays are an SG relay and a COVG relay.

FIG. 4 is an example of state change data in the monitored system. The leftmost number is a line number given for convenience.
The first line shows that the BT relay installed on the B-5CB operated at 9: 55: 5.010 seconds, and the seventh line B-5CB shut down at 9: 55: 5.070 seconds. It is shown that. FIG. 5 is a diagram showing an example of the output of the result of estimation of the details of an accident in the power system monitoring device to the display device 5 when the state change data of FIG. 4 is used as an example. This indicates that an accident occurred on the # 1 bus.

Next, the operation will be described. FIG. 6 is a flowchart showing a process of estimating the content of an accident for outputting to the display device 5 as shown in FIG. 5, which is a process in the case where the entire computer is viewed. First, in step S61, the status of the power system 1 is constantly monitored by the status change monitoring means 42, and when a change occurs in the status, the status of the status change is fetched, the status change data is received and stored in the facility data storage means 41. The equipment status data that has been set.

The state change monitoring means 42 transfers the state change data to the accident content estimating means 44. FIG. 4 is an example of state change data for the system of FIG. Step S62
State change data and equipment data storage means 41 received in S61
Of the power system 1 stored in the power system 1 and the knowledge stored in the knowledge storage means 43 are used to estimate the contents of the accident that has occurred in the power system 1. In step S63, the contents of the accident estimated in step S62 are output to the output device, and the process ends.

Next, the processing in step S62 shown in FIG. 6 will be described in detail with reference to FIG. In step S71, state change data relating to the operation of the relay is extracted from the state change data received in step S61. FIG. 8 shows an example of the state change data of FIG. FIG. 8 shows that there are six activated relays. In step S72, the relay protection equipment for all the relays extracted in step S71 is determined using the equipment data in the equipment data storage means 41 and the knowledge in the knowledge storage means 43.

FIG. 9 shows an example of the protection equipment for the relay shown in FIG. In step S73, from among the protection facilities obtained in step S72, a facility common to all the relay protection facilities is extracted, and the facility is designated as an accident facility. In FIG. 9, equipment common to all relay protection equipment is the B # 1 bus, and the B # 1 bus is the accident equipment.

Next, the inference process in step S72 will be described with reference to FIG. In step S101, one of the relays extracted in step S71 for which protection equipment for the relay has not yet been requested is selected. In step S102, application knowledge for the relay selected in step S101 is extracted. In step S103, it is determined whether or not it is necessary to reproduce the system state based on the extracted knowledge. If necessary, the system state is reproduced in step S104. If it is not necessary, the system status stored in the facility data storage is extracted in step S105. In step S104, the state of the system at the time when the target relay operates is determined in step S6.
1 and storage means for facility data received by
Reproduce using the equipment data stored in 41. The reproduced system is used as the system used in step S106.

FIG. 12 is a diagram that reproduces the state of the system at the time when the fifth COVG operates in the operated relay of FIG. 8 with respect to the example of the system of FIG. In step S105, the system stored in the facility data storage means 41 changed in step S61 is extracted, and is set as the system used in step S106. In step S106, a relay protection facility is determined based on the system state reproduced in step S104 or the system state extracted in step S105 and the knowledge stored in the knowledge storage unit 43. Step S1
In step 07, it is determined whether there is a relay that does not require protection equipment for the relay in the activated relay.If there is a relay that does not require protection equipment, the process returns to step S101 to perform the above-described processing. To end.

Next, the detailed processing in step S72 will be described with reference to a knowledge example for estimating the content of an accident shown in FIG. FIG. 11 shows a part of the knowledge stored in the knowledge storage means 43. The knowledge shown in FIG. 11 is a partial example of knowledge for estimating the details of an accident, and determines the system state in which the relay of interest operates in a conditional part starting from IF. Also, determine the protection equipment for the relay of interest in the execution unit starting with THEN.

In FIG. 2, a case where a relay as shown in FIG. 8 operates will be described as an example. First, 1 of the state change data in FIG.
The second B-5CB, BT relay is selected. B-5C
The knowledge extracted for the operation of the B and BT relays is the third knowledge in FIG. In the condition part of the third knowledge, when adapted to the equipment data of FIG. 3, there is a switch B-5CB connected to the B # 1 bus, a BT relay is installed in the switch B-5CB, and the BT relay is further operated. All the conditions are satisfied. As a result, in the execution unit, the protection equipment is a B # 1 bus and a B # 2 bus.

Next, the second B-1CB, COVG in FIG.
Relay is selected. The knowledge applicable to the operation of the B-1CB, COVG relay is the fourth and fifth knowledge in FIG. Since it is necessary to reproduce the system state with the fourth and fifth knowledges in FIG. 11, the system state at the time when the B-1CB, COVG relay operates is reproduced. FIG. 12 shows B-1C
B, This is a reproduction of the system state at the time when the COVG relay operates. In FIG. 12, □ _* indicates that the CB is in the cutoff state, and □ indicates that the CB is in the on state.

In the condition part of the fourth knowledge shown in FIG. 11, when adapted to the equipment data shown in FIG. 3, there is a switch B-1CB connected to the AB # 1L transmission line, and the switch B-1CB has a COV.
The condition that the G relay is installed and the COVG relay is operating is satisfied. However, this is contrary to the condition that none of the switches connected to the AB # 1L transmission line is cut off in the reproduced system state. Therefore, B
For the -1CB, COVG relay, the fourth knowledge execution unit in FIG. 11 is not processed.

The fifth B-1CB, COVG in FIG.
For the operation of the relay, in the condition part of the fifth knowledge of FIG. 11, when adapting to the equipment data of FIG. 3, there is a switch B-1CB connected to the AB # 1L transmission line, and the switch B-1
The condition that the COVG relay is installed in the CB and the COVG relay is operating is satisfied. Further, in the reproduced system state, all the conditions that one of the switches connected to the AB # 1L transmission line is cut off are satisfied.

As a result, in the execution section starting from THEN, the protection equipment is a B # 1 bus and a BC # 1L transmission line.
The same processing as described above is performed for all the third and subsequent relays in FIG. 8 to determine the protection section of the relay. As a result, when the relay shown in FIG. 8 operates in FIG.
The protection section of the relay as shown in FIG.
As described above, it is possible to correctly estimate the details of the accident that has occurred on the B # 1 bus in FIG.

[0024]

As described above, according to the present invention, the operation relay is extracted when an accident occurs, and the equipment data of the protection equipment for all the relays is obtained by using the knowledge in the storage means to reproduce the system state. Judgment as to whether or not it is necessary, and when necessary, the system status at the time when the target relay was operated was reproduced, so that the protection equipment was newly requested,
Even if an accident occurs in the power system where the power system becomes complicated and multiple protective devices cooperate in a complicated manner,
It is possible to provide a power system monitoring device capable of estimating the details of an accident.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of an embodiment of a power system accident determination device according to the present invention.

FIG. 2 is an example diagram of an electric power system 1.

FIG. 3 is a partial example diagram of equipment data storage means in the case of the system configuration of FIG. 2;

FIG. 4 is an example diagram of state change data in the monitored system of FIG. 2;

FIG. 5 is a view showing an example of output of an accident content estimation result to a display device 5 according to the present invention.

FIG. 6 is a flowchart showing an accident content estimation process for outputting to the display device as shown in FIG. 5;

FIG. 7 is a flowchart showing the process of step S62 in FIG. 6;

FIG. 8 is an example of data relating to the operation of the relay in the state change data of FIG. 4;

FIG. 9 is a view showing an example of a relay protection section relating to the data of FIG. 8 in FIG. 2;

FIG. 10 is a flowchart showing a process in step S72 of FIG. 7;

FIG. 11 is a configuration example diagram of a knowledge storage unit.

FIG. 12 is an example diagram of a power system in the middle of the case where the state of FIG. 4 has occurred in the power system of FIG. 2;

FIG. 13 is a functional block diagram of one embodiment of a conventional power system monitoring device.

FIG. 14 is an output example diagram of an accident content estimation result by the conventional power system monitoring device.

[Explanation of symbols]

 Reference Signs List 1 power system 2 transmitting station 3 receiving station 41 equipment data storage means 42 condition change monitoring means 43 knowledge storage means 44 accident content estimation means 45 system state reproduction means 5 display device

──────────────────────────────────────────────────続 き Continued on the front page (72) Kazue Shimada, 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant, Inc. (72) Inventor Takeshi Kasuya 1-1-1 Musashidai, Fuchu-shi, Tokyo Toshiba Engineering Corporation Fuchu Works (72) Inventor Etsuro Natsumura 1-1-1-1 Musashidai, Fuchu-shi, Tokyo Toshiba (56) References JP-A-61-224830 (JP, A) JP-A-2-16827 (JP, A) JP-A-63-161817 (JP, A) (58) Fields investigated (Int.Cl. ⁶ , DB name) H02H 3/00-5/00

Claims (1)

(57) [Claims] 1. A constantly monitors the facilities data storage unit, wherein the variable data form includes a state change time is come transmitted from each facility of the monitored system for storing electric power system equipment data including status data of the monitored system And a state change monitoring means for updating the equipment data storage means, and when the state change is continuous from the state change data and the contents of the equipment data storage means, the relay operation time
Time-series data on relays and circuit breakers due to traffic
System state reproduction means for reproducing a power system state based on the above, knowledge storage means for storing knowledge about the relationship between the power system state, state change data, and accident at the time of the accident, and contents of the equipment data storage means It is made of the accident contents estimation means for estimating the content of the accident from the contents of the power system state and state change data and knowledge storage means at the time of the accident created in the system condition reproducer power system monitoring device according to claim.