JPH08168175A - Fault recovery support system for power system - Google Patents

Abstract

PURPOSE: To discuss countermeasures to be taken against a concerned facility quickly by simulating recovery of an interrupted power system and presenting information, to be considered by an operator in the operation of the recovered system, on a display. CONSTITUTION: Upon occurrence of a fault in a power system, observed information from the power system is preserved at a section 3-1 for preserving the unrecovered system. Based on the unrecoyered system thus preserved, a power system facility data preserved in a power system facility data base 3-2, and a knowledge related to the recovery of fault preserved in a knowledge base 3-3, an inference engine 3-4 generates a recovery procedure which is then preserved at a recovery procedure preserving section 3-5. The recovery procedure is then executed using the unrecovered system preserved at the section 3-1 and the power system facility data preserved in the facility data base 3-2. Subsequently, the recovered system is simulated and the direction of power flow is checked at a relay setting changing/extracting section 3-8. Relays for which the setting must be changed are presented on a display 4 and notified to the operator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system accident recovery support device which automatically creates an accident recovery procedure based on information observed from the power system when a power system accident occurs and presents it to an operator.

[0002]

2. Description of the Related Art Conventionally, when an accident occurs in an electric power system, an operator judges the accidental equipment from the information of the activated protective relays and breaking CBs, disconnects the accidental equipment from the electric power system, and restores the sound equipment. I was doing the operation to do.

Further, recently, as an aid for recovery operation in the event of a power system accident, knowledge engineering is applied to automatically judge the accident equipment based on the specialized knowledge and experience of the operator, and the judgment is made. From the results, a technology for automatically creating a restoration procedure was developed (Japanese Patent Application No. 4-59871, 1992 March 1992).
Application on May 17). This technology accumulates rules for accident recovery in advance, selects the rules that apply to the state of the power system at the time of the accident in the power system, determines the recovery procedure,
This is to notify the operator.

FIG. 21 shows a configuration example of a power system accident recovery support device according to this conventional technique. In FIG. 21, reference numeral 1 is an electric power system targeted for accident recovery, and 2 is an input device for fetching observation information of the electric power system 1. 3 is an electronic computer that performs processing for creating a restoration procedure based on the observation information of the power system 1, and 4 is a display device for displaying the processing result of the electronic computer 3, such as a color display, A liquid crystal display is used. The electronic computer 3 stores the pre-recovery system storage unit 3-1 that stores the pre-recovery system data (data such as the on / off state of the circuit breaker and disconnector, and the tidal current value) input from the input device 2 when a power system accident occurs. And a power system facility database 3-2 that stores data related to the facilities of the power system 1 (for example, the connection relationship between the facilities such as the busbar A and the power transmission line B being connected by the circuit breaker C). , Create a recovery procedure based on knowledge base 3-3 that stores knowledge about accident recovery, pre-recovery system and facility database 3-2 and knowledge base 3-3 stored in pre-recovery system storage unit 3-1 Inference engine 3-4 and a recovery procedure storage unit 3-which stores the recovery procedure created by this inference engine 3
It is composed of 5.

[0005]

However, the above-mentioned conventional method does not consider the system reliability after executing the created restoration procedure. Therefore, there are the following problems. (1). Even after the accident recovery, if the system configuration is different from the standard system and it is necessary to reset the protection relay, the operator himself has to judge the relevant part from the system after the recovery, and a judgment error occurs. In such a case, even if an accident occurs in the system after restoration, the accident cannot be detected and the accident may be expanded.

(2). In the conventional device, a restoration procedure is created so that the restoration operation does not cause an overload. However, in reality, even if no overloaded equipment has occurred in the system after restoration, if there is equipment operated with a load close to the rated capacity value, it is necessary to call attention to the operator.

(3). Further, the load amount, which becomes a threshold value for urging the operator to pay attention, differs depending on the environmental conditions of the facility such as the temperature, and therefore it is desirable that it can be easily changed depending on the operating conditions.

(4). In the conventional equipment, if an accident occurs again in the system after the restoration, there is a place where one of the parallel transformers is stopped and one of the parallel transformers is stopped, which may cause the equipment to interrupt the supply. However, it does not have the means to present to the operator.

(5). Even when alerting the operator as in (2) and (3) above, since the system reliability is not evaluated when an accident occurs in the system after restoration, the overall reliability of the system after restoration Is hard to grasp.

In short, the conventional technology has no means for grasping the system status after the created recovery procedure and automatically presenting the above-mentioned situation which should be noted in the system operation to the operator. Recognizing and securing the reliability of the system after restoration had a problem in that it had to rely on the skill and experience of the operators.

The present invention solves the above-mentioned problems and creates a system state after performing the created restoration procedure in a simulated manner. By automatically providing the operator with the accompanying information together with the recovery procedure, the purpose is to easily grasp the system status after the recovery operation and to quickly consider countermeasures for the problematic equipment. There is.

[0012]

In order to achieve the above object, in the invention of claim 1, means for simulating the restoration procedure obtained in the same manner as in the prior art, in the computer, after the accident restoration, is created. And means for saving the systematic state,
By providing a means for recognizing the protection status of the protection relay on the system after restoration, it is possible to recognize the equipment that needs to change the relay setting in the system after restoration.

According to the second aspect of the present invention, for each facility, the warning load factor data in which the load factor which requires the caution in system operation is set is defined, and the saved warning load set in the restored system is restored. Equipment that exceeds the rate was presented to the operator to call attention.

Further, in the invention of claim 3, the warning load factor of claim 2 can be arbitrarily set for each facility by the operator's judgment by using a keyboard or the like. Furthermore, claim 4
In the invention of claim 1, means for searching for the one-sided operation point of the parallel two-line transmission line or the isolated operation point of the transformer is provided on the restored system after the restoration, and there is a possibility that a power supply interruption facility is caused in the event of an accident. I made it possible to recognize a certain facility.

Further, according to the invention of claim 5, the reliability analysis calculation is performed on the saved system after restoration to evaluate a possible accident expected to occur on the system after restoration,
The accident severity, supply disruption equipment due to the accident, and overload equipment can be grasped in the entire system.

[0016]

With the above configuration, it becomes possible for the operator to recognize the facility to be noted in operation and additional information on the facility in the restored system in which the created accident recovery procedure is simulated.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 will be described with reference to FIGS. 1, 2, 3, 4, and 5. FIG.
Shows the configuration of the embodiment of claim 1, and parts corresponding to the devices and means described in FIG. In FIG. 1, a power system 1, an input device 2, a computer 3, a display device 4, and a pre-recovery system storage unit 3-1, which constitutes the computer 3, a power system facility database 3-2, a knowledge base 3-3, inference. The engine 3-4 and the recovery procedure storage unit 3-5 have the same functions as the conventional functions. In the present invention, in addition to the above configuration means, pre-recovery system data and facility database 3-2 stored in the pre-recovery system storage unit 3-1.
A post-restoration system simulation creation unit 3-6 is provided that simulates the creation of the system state after the restoration procedure stored in the storage unit 3-5 based on the equipment data of 1. Furthermore, this creation unit 3
After restoration for saving the system created by -6, the system storage unit 3-7, the relay set value is searched on the system stored in this storage unit 3-7, and the relay whose setting value should be changed is selected. A relay setting change extraction unit 3-8 for extracting is provided.

Next, the operation of this embodiment will be described.
First, the power system diagram of the accident recovery target will be described. The pre-restoration system is, for example, the system shown in FIG. In FIG. 2, 50 and 51 are generators as power sources, X ₁ is an accident point,
It shows that there was an accident in the power transmission line between the circuit breakers CB01 and CB02. To the symbol of the circuit breakers CB01 and CB02 ×
The mark means that it was automatically released due to accident X ₁ . CB05 is a circuit breaker that was opened before the accident, while CB03, CB04, CB06, CB
07 and CB08 are circuit breakers that are still closed after the accident. Further, Ry01, Ry02, Ry03, Ry04, Ry05, Ry06
And Ry07 indicate protection relays, and the arrow of each protection relay indicates the protection direction of each protection relay. The equipment in the dotted line in the figure shows the power failure state, and the solid line in the figure shows the charging state. CB01-C due to accident at X ₁ point
The equipment between B05 is out of power.

The pre-recovery system stored in the pre-recovery system storage unit 3-1 of FIG. 1 and the power system equipment database 3-2.
The inference engine 3-4 creates a recovery procedure for relieving the power outage facility by using the facility information stored in 1. and the knowledge for accident recovery stored in the knowledge base 3-3. Then, this restoration procedure is performed by the restoration procedure storage unit 3
It is stored in -5. FIG. 3 shows a display example of the recovery procedure created in this embodiment. Recovery procedure storage unit 3-5 in FIG.
The restoration procedure saved in is simulated by using the facility data 3-2 and the post-restoration system simulation creation unit 3-6 using the pre-restoration system stored in the pre-restoration system storage unit 3-1. To do. As a result, in the pre-restoration system of FIG. 2, the circuit breaker CB05 is turned on and the power transmission line from the circuit breaker CB05 to the B bus is charged. As a result, the system after restoration becomes as shown in FIG. This restored system is stored in the restored system storage unit 3-7 in FIG.

In the restored electric power system shown in FIG. 4, when an accident X ₂ occurs between the circuit breaker CB03 and the bus C, the protection relay Ry04 does not protect the direction of the C bus but the circuit breaker CB04. This accident cannot be detected because it is in the direction of the transmission line between CB05, and the accident is detected by the protection relay Ry05, the circuit breaker CB06 is opened, the accident point X ₂ is disconnected, and the bus B and the bus D are separated. There will be a power outage.

In the relay settling change extracting section 3-8 shown in FIG.
Check the tide direction, take out the relays Ry03, Ry04 whose protection direction is different from the tide direction as relays whose settling should be changed, and operate them in the form shown in FIG. 5 by the display device 4 of FIG. 1 (display screen 4-11). Present to staff.

According to the first aspect of the present invention, the operator can recognize the location where the protection direction of the protection relay should be changed in the system after the accident recovery, and thus the protection relays Ry03, Ry.
By changing the protection direction of y04, even if the accident X ₂ shown in the above embodiment occurs in the system of FIG. 4, the protection relay Ry04 can detect the accident and open the circuit breaker CB04. As a result, the power outage facility can be reduced only between the B bus and the circuit breaker CB04, and the reliability of system operation after the accident recovery can be improved.

Next, an embodiment of the invention described in claim 2 will be described with reference to FIGS. 6, 7, 8, 9 and 10. FIG. 6 is a diagram showing the configuration of this embodiment. In FIG.
Power system 1, input device 2, electronic computer 3, display device 4, pre-recovery system storage unit 3-1 constituting the electronic computer 3, power system facility database 3-2, knowledge base 3-3, inference engine 3-4 , A restoration procedure storage unit 3-5, a post-restoration system simulation creation unit 3-6 that creates a post-restoration system simulation from the recovery procedure obtained in the storage unit 3-5, and a simulation creation by the creation unit 3-6 Post-restoration system storage unit for saving system 3-
7 is the same as the configuration in the case of the invention shown in FIG. In the present invention, in addition to the above configuration, a warning load factor data storage unit 3-9 that stores an upper limit value of a load factor that should be watched in the operation of each facility and a load set in the storage unit 3-9. This is configured by a caution load factor excess equipment extraction unit 3-10 which extracts equipment having a tidal current exceeding the rate and outputs it to the display device 4.

In the case of this embodiment, the pre-restoration system is assumed to have a shape as shown in FIG. 7, for example. In FIG. 7, Y is the accident point, and CB010 and CB011 are circuit breakers automatically opened by this accident Y. On the other hand, CB012
Indicates a circuit breaker that was opened before the accident, and CB013 indicates a circuit breaker that was in the closed state after the accident. Further, H, L, and M represent transformers, and G, I, J, K, N, and O represent busbars. The J bus indicated by the broken line is the circuit breaker CB11.
Indicates that there is a power outage due to interruption of power. Fig. 9 shows an example of the restoration procedure (display screen 4-02) created for this system.
Shown in This restoration procedure is performed by the post-restoration system simulation creating unit 3-6 shown in FIG. 6 for the pre-restoration system stored in the storage unit 3-1 of FIG. As a result, FIG.
The circuit breaker CB012 is turned on to remedy the power failure of the J bus and charges the J bus through Line01. As a result, the system after restoration is as shown in FIG. The load factor of each facility on the system of FIG. 8 and the alert load factor data storage unit 3 of FIG.
While comparing the caution load factor data stored in -9, if there is a facility that exceeds the caution load factor, the caution load factor excess facility extraction unit 3-10 searches. The alert load factor data of each facility is described in the form as shown in the display screen 4-21 of FIG. For example, in the case of the transformer L in FIG. 8, the load factor is 80
If it exceeds%, the equipment is subject to extraction. The extracted vigilance load factor excess equipment is displayed on the display device 14 of FIG. 6 in the format shown in the display screen 4-22 of FIG. 11 to notify the operator.

According to the second aspect of the present invention, it is possible to recognize in advance the equipment with a high risk of being overloaded in the system after the accident recovery. Therefore, the operator should be warned of these equipment. Is possible.

Next, an embodiment of the invention described in claim 3 will be described.
This will be described with reference to FIG. 12 and FIG. FIG. 12 shows the configuration of the embodiment of claim 3. In FIG. 12, a power system 1, an input device 2, a computer 3, a display device 4, and a pre-restoration system storage unit 3-1, which constitutes the computer 3, a power system facility database 3-2, a knowledge base 3-3, Inference engine 3-4, restoration procedure storage unit 3-5, post-restoration system simulation creation unit 3-6 that creates a post-restoration system from the recovery procedure obtained by this storage unit 3-5, and this simulation creation unit 3- 6
The post-restoration system storage unit 3-7, the alert load factor data storage unit 3-9, and the alert load factor excess equipment extraction unit 3-10 which save the system created by simulation are the same as the configuration of FIG. In addition to the above-described configuration, the present invention includes an input device 4a of the display device 4,
The configuration is provided with a load factor arbitrary setting unit 3-11 for arbitrarily setting the caution load factor data according to the operator's judgment. A keyboard can be considered as the input device 4a, but it goes without saying that a light pen, a mouse, a touch screen, a card reader, or a voice input device can be used.

The operation of the embodiment shown in FIG. 12 will be described. The caution load factor data stored in the caution load factor data storage unit 3-9 is displayed on the display device 4 in the form as shown in FIG. This alert load factor is changed and set by the operator's judgment according to the alert load factor optional equipment setting 3-11 and stored in the alert load factor data storage unit 3-9. The stored alert load factor data is referred to by the alert load factor excess equipment extracting means 3-10. The operation of this embodiment other than the caution load factor arbitrary equipment is the same as that of the embodiment of FIG.

According to the present embodiment, the warning load factor can be set arbitrarily, so that even if the conditions of system operation change in the summer or winter, the warning load factor can be accurately set by the operator's judgment. It is possible to operate the system with high reliability according to the system condition.

Next, an embodiment of the invention described in claim 4 will be described.
This will be described with reference to FIGS. 13, 14, 15, 16, and 17.
FIG. 13 shows the configuration of the embodiment of claim 4. In FIG. 13, a pre-recovery system storage unit 3-constituting the power system 1, the input device 2, the electronic computer 3, the display device 4, and the electronic computer 3
1, a power system facility database 3-2, a knowledge base 3-3, an inference engine 3-4, and a restoration procedure storage unit 3-.
5, after restoration system simulation creation unit 3-6, after restoration system storage unit 3
-7 is the same as in the configuration of FIG. In the present invention, in addition to the above configuration, the power system facility database 3-2
And an independent operation equipment extraction unit 3-12 for extracting a single-line operation point of a parallel two-line transmission line or an independent operation point of a transformer by referring to the restored system saved in the storage section 3-7. It is configured.

Next, the operation of this embodiment will be described. The system before restoration has, for example, a shape as shown in FIG. Figure
In 15, Z is the accident point of the transformer R, CB022, CB02
3 shows the circuit breaker automatically opened by this accident Z. CB025 is a circuit breaker that was open before the accident. CB020, CB021, CB024, CB026 and C
B027 is a circuit breaker that is in the closed state even after the accident Z. Q and W represent transformers similar to R. The display screen example (4-03) of the restoration procedure created when the transformer Q becomes overloaded due to the influence of the accidental interruption of the transformer R point Z
See Figure 17. After restoration, the system simulation creation section 3-6 in FIG.
The procedure of FIG. 17 is performed for the system of FIG. Applying CB025, C as a procedure to eliminate the overload of the bus transformer Q
The opening operation of B024 is performed and the busbar U is switched.

As a result, the overload of the transformer Q is eliminated and the system shown in FIG. 16 is obtained. In the system shown in FIG. 16, since the parallel transformer R of the transformer Q is stopped, when an accident occurs in the transformer Q, all the lower facilities are out of power. Therefore, by the islanding equipment extraction unit 3-12 in FIG.
From the power system equipment database 3-2 and the restored system storage unit 3-7, the transformer Q is recognized as an independent operation facility,
To be extracted. The extracted islanding facility is displayed on the display device 4 of FIG. 13 in the form as shown in FIG. 14, for example, and the operator is notified.

According to this embodiment, in the case where an accident occurs, by searching for and extracting one-side operating points of parallel two-line transmission lines and single-operation points of transformers on the restored system Since it is possible to recognize equipment that is likely to cause trouble equipment, the operator can consider measures against those equipment in advance. This enables highly reliable system operation.

Finally, an embodiment of the invention described in claim 5 will be described with reference to FIGS. 18, 16, 19, and 20. Figure
Reference numeral 18 shows the configuration of the embodiment of claim 5. In FIG. 18, a power system 1, an input device 2, a computer 3, a display device 4, and a pre-restoration system storage unit 3 that constitutes the computer 3
-1, a power system facility database 3-2, a knowledge base 3-3, an inference engine 3-4, and a restoration procedure storage unit 3
-5, the post-restoration system simulation creation unit 3-6, and the post-restoration system storage unit 3-7 have the same configurations as in FIG. In the present invention, in addition to the above configuration, a set accident equipment unit 3-13 for setting a supposed accident equipment from the input device 4a of the display device 4 for the restored system stored in 3-7, and this setting unit 3-13 The system reliability analysis calculation unit 3-14, which calculates the system reliability at the time of the occurrence of the expected accident set by the above, is configured. The input device 4a is the same as in the case of FIG.

The operation of this embodiment will be described. Assuming that the configuration is the same as in Fig. 13 up to the procedure for saving the system after the accident recovery,
The system after the accident recovery is shown in Fig. 16. The expected accident equipment is input to this system from the input device 4a of the display device 4. The input screen is, for example, the screen (4-41) shown in FIG. The system reliability analysis calculation unit 3-14 performs the system reliability analysis calculation for the input expected accident. The reliability analysis calculation result is calculated, for example, as the serious accident index of the set accident by the following one formula shown in the publicly known paper "Academic Society of Japan Annual Meeting Proceedings [8] -1101".

[0035]

[Equation 1] In Equation 1, S is a serious accident evaluation index, P _k is the power flow value of the branch k after the accident, ^* P _k is an upper limit value of the power flow of the branch k, K is a set of branches exceeding the limit value, and A is a serious value. The respective thresholds for accident evaluation are shown. 1 above
The calculation result of the formula is displayed on the display device 4 together with the T bus, which is a supply hindrance facility, and presented to the operator. The result output screen has a shape as shown in 4-42 of FIG. 20, for example.

According to the present invention, since the reliability analysis calculation is performed on the system after the restoration, the system reliability after the restoration can be comprehensively evaluated, and the operator can take a countermeasure against the equipment which becomes the system neck in advance. Can be considered. This enables highly reliable system operation.

[0037]

As described above, according to the present invention, the system status after restoration is grasped in advance before the restoration operation is performed,
After restoration, the operator can be made aware of equipment that is likely to cause operational problems. This makes it possible to promptly take measures to improve the reliability of the system after restoration.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of an embodiment corresponding to claim 1 according to the present invention.

FIG. 2 is a power system diagram before restoration in one embodiment corresponding to claim 1.

FIG. 3 is a diagram showing a display example of a recovery procedure in an embodiment corresponding to claim 1;

FIG. 4 is a power system diagram after restoration in one embodiment corresponding to claim 1.

FIG. 5 is a diagram showing an output display example in one embodiment corresponding to claim 1.

FIG. 6 is a diagram showing the configuration of an embodiment corresponding to claim 2 according to the present invention.

FIG. 7 is a power system diagram before restoration of each embodiment corresponding to claim 2 and claim 3 according to the present invention.

FIG. 8 is a power system diagram after restoration in an embodiment corresponding to claim 2.

FIG. 9 is an output display example diagram of each embodiment corresponding to claims 2 and 3;

FIG. 10 is a view showing a display example of a warning overload ratio data storage image used in each embodiment corresponding to claims 2 and 3;

FIG. 11 is a diagram showing an output display example in each embodiment corresponding to claim 2 and claim 3;

FIG. 12 is a diagram showing the configuration of an embodiment corresponding to claim 3 according to the present invention.

FIG. 13 is a diagram showing the configuration of an embodiment corresponding to claim 4 according to the present invention.

FIG. 14 is a diagram showing an output display example regarding an islanding facility.

FIG. 15 is a power system diagram before restoration of an embodiment corresponding to claim 4 according to the present invention.

FIG. 16 is a power system diagram after restoration of an embodiment corresponding to claim 4 according to the present invention.

FIG. 17 is a diagram showing a display example of a recovery procedure in an embodiment corresponding to claim 4;

FIG. 18 is a diagram showing the configuration of an embodiment corresponding to claim 5 according to the present invention.

FIG. 19 is a view showing a display example of a supposed accident facility in one embodiment corresponding to claim 5;

FIG. 20 is a diagram showing an output display example of a display device according to an embodiment corresponding to claim 5;

FIG. 21 is a diagram showing a conventional accident recovery support device.

[Explanation of symbols]

1 ... Electric power system, 2 ... Input device, 3-1 ... Pre-restoration system storage unit, 3-2 ... Electric power system equipment database, 3-3 ... Knowledge base, 3-4 ... Inference engine, 3-5 ... Restoration procedure storage Section, 3-6 ... restoration system simulation creation section, 3-7 ... restoration system storage section, 3-8 ... relay settling change storage section, 3-9 ... warning load rate data storage section, 3-10 ... warning load Exceeding rate equipment extraction unit, 3-11 ... Optional load unit for warning load factor, 3-12 ... Single operation equipment extraction unit, 3-13 ... Assumed accident equipment setting unit, 3-14 ...
System reliability analysis calculation unit, 4 ... Display device.

Claims (5)

[Claims] 1. A power system facility database that stores information on a power system, a knowledge base that stores knowledge about a procedure for recovering from an accident that has occurred in the power system, and a restoration procedure by referring to the facility database using the knowledge. In a power system accident recovery support device equipped with an inference engine that performs inference to create a system, based on pre-recovery system data and power system facility data, simulate the system after performing the recovery procedure created by the inference engine. A means for creating, a restored system storage section for storing the system state created by this means, and a means for retrieving the relay set value on the restored system stored in this storage means and extracting a relay whose setting should be changed And a means for displaying the result extracted by the extracting means, the power system accident recovery support device. 2. A power system facility database that stores information on the power system, a knowledge base that stores knowledge about a procedure for recovering from an accident that has occurred in the power system, and a restoration procedure that refers to the facility database by using the knowledge. In a power system accident recovery support device equipped with an inference engine that performs inference to create a system, based on pre-recovery system data and power system facility data, simulate the system after performing the recovery procedure created by the inference engine. A means for creating, a post-restoration system storage unit for saving the system state created by the means, and an alert load for storing data defining an alert load factor that requires caution in system operation for equipment on the power system The rate data storage unit is compared with the warning load factor data stored in this storage unit and each of the simulated facilities created on the post-restoration system Power system accident recovery support characterized by comprising means for extracting equipment that exceeds the load factor defined in the load factor data and means for displaying the equipment extracted by this alert load factor excess equipment extraction means apparatus. 3. The power system accident recovery support device according to claim 2, further comprising means capable of arbitrarily changing the setting of the warning load factor according to the judgment of the operator. apparatus. 4. A power system facility database that stores information on the power system, a knowledge base that stores knowledge about a procedure for recovering from an accident that occurred in the power system, and a restoration procedure that refers to the facility database using the knowledge. In a power system accident recovery support device equipped with an inference engine that performs inference to create a system, based on pre-recovery system data and power system facility data, simulate the system after performing the recovery procedure created by the inference engine. The means to be created and the system storage after restoration that saves the system state created by this means are compared with the system before the accident recovery and after the accident recovery. Power system accident recovery support, characterized in that it comprises means for extracting a transformer that is present and means for displaying the equipment extracted by this extracting means. Supporting device. 5. A power system facility database that stores information on the power system, a knowledge base that stores knowledge about a procedure for recovering from an accident that occurred in the power system, and the facility database using the knowledge to refer to the recovery procedure. In a power system accident recovery support device equipped with an inference engine that performs inference to create a system, based on pre-recovery system data and power system facility data, simulate the system after performing the recovery procedure created by the inference engine. A means for creating, a post-restoration system storage section for storing the system state created by this means, a means for performing system reliability analysis calculation based on the saved system information after restoration, and a calculation by this analysis calculation means And a means for displaying the system reliability index that has been set.