JPH06261445A - Deciding equipment for accident section of electric power system - Google Patents

Abstract

PURPOSE:To make it possible to empirically retrieve the area of target zone where an accident has occurred by assuming a section where the accident oc curred at the accident occurrence time in a power system and by verifying whether an accident occurred or not in the assumed section through simulation of the like. CONSTITUTION:At the time of the occurrence of an accident in a power system, a section where power service interruption occurred by a circuit breaker tripped is detected, an arbitrary section is fetched from the sum of sets in the protection zone of each protective relay operated (steps ST1 to ST4). By the knowledge on the operating principle of relays, a simulation is performed for the operation protective relays and tripped breakers (step ST5). Simulation results are compared to the actual operation information, it is checked whether there is a possibility of the accident in a section taken out and, if it is decided that no accident occurred in all the sections, then the sections where the accidents have occurred are selected from the sum of sets by applying the knowledge of empirically retrieving the area of target accident sections (steps ST6 and ST8).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric power system for determining a necessary accident section in the case of automatically recovering an accident from a wide area system information by using a computer when an accident occurs in the electric power system. The present invention relates to a system for determining a faulty section of a system.

[0002]

2. Description of the Related Art A conventional power system accident section determination device is disclosed in, for example, Japanese Patent Laid-Open No. 54-97747. This accident zone determination device calculates separately the device that inputs the information of the circuit breaker and the operation information of various protective relays and the degree to which these information contribute to the accident detection of the protection zone, and the individual degree is calculated for each protection zone. And a device for calculating the accident probability by statistical processing, and it is determined that the probability of accident occurrence is high in the order of the section with the highest accident probability.

[0003] This conventional accident section determination device is information that cannot be obtained in the current information transmission system due to the limitation of its capacity when an accident occurs in the power system, that is, a relay that constitutes a sequence of each operation protection relay. Since the device is premised on obtaining operation information (sequence signal) for each element, it is difficult to apply it to an actual computer for power system control. This is because the sequence signal is a contact signal of a protective relay or the like, and therefore there are many false signals due to noise or the like. Therefore, if an accident occurs in the power system,
In determining the accident section, the operator of the power supply station confirmed the operating conditions of the protective relays and tripped circuit breakers that were operated due to the accident. Then, the accident analysis was performed by using the information obtained from the operation status to comprehensively determine the accident section.
As a result, it took a lot of time to recover from the accident. More specifically, it is as follows. When an accident occurs within the jurisdiction of a power supply station, the operator of the power supply station collects the operation information of the circuit breaker and the protective relay, and whether the collected operation information of the circuit breaker is the operation information of the main protection, Check if it is the operation information by the backup protection. At the same time, the section in which the accident occurred is estimated from the combination of these operation information, and depending on the information at that time, the malfunction of the circuit breaker or the malfunction of the corresponding protective relay that is conceivable can be confirmed to finally determine the accident section. Was being made.

[0004]

Since the conventional faulty area determining device for a power system is configured as described above, the faulty area for the power system can be determined by a highly intelligent judgment of the operator of the power supply station. Must be done, which requires skilled operators. In particular, when complex accidents such as multiple accidents and blind spot accidents occur, there is a problem that it is difficult to analyze the power system that tends to become huge and complicated recently, and it takes a long time to determine the accident section. Furthermore, there is a problem that the judgment time varies depending on the experience and ability of the operator.

The present invention has been made in order to solve the above problems, and it is possible to determine the accident section in the power system at high speed and with high reliability, and to perform the automatic recovery operation reliably. The purpose is to obtain an accident section determination device.

[0006]

According to the present invention, there is provided a power system fault zone determination device, wherein, when a power system fault occurs, the protection range of each protection relay is determined from the operation information of the protection relay or the circuit breaker. , A union unit 2 for taking the union of the sections that have lost power due to an accident, and an extraction unit 3 for taking out the sections included in the union obtained by this union unit one by one,
If there is an accident in the section taken out by the extraction means, there is a simulation means 4 for simulating the operation of the circuit breaker tripped with the protective relay based on the knowledge of the operating principle of the protective relay, and an accident obtained by this simulation means. Assuming that, the protection relay to be operated and the tripped circuit breaker are compared with the actual operation information to verify whether or not an accident has occurred in the section extracted by the extraction means, and the above-mentioned verification means 5. A section in which an accident has occurred from the sections included in the union obtained by the union unit, when the verification unit verifies that no accident has occurred in all the sections extracted by the extraction unit. A narrowing-down means 6 for narrowing down, and an output means 7 for outputting the result determined by the verification means and the narrowing-down means. There.

[0007]

In the power system fault section determination device according to the present invention, the union means 2 first determines the protection range of each protection relay from the operation information of the protection relay or the circuit breaker when a power system fault occurs. , Take the union of the sections that had a power outage due to an accident. Next, the extraction unit 3 extracts the sections included in the union obtained by the union unit one by one. Next, the simulation means 4 simulates the operation of the circuit breaker tripped with the protective relay based on the knowledge of the operating principle of the protective relay, assuming that there is an accident in the section taken out by the extracting means. Next, the verification means 5 compares the protection relay to be operated and the tripped circuit breaker, assuming that there is an accident, obtained by the simulation means, with the actual operation information, and the extracted by the extraction means. Verify whether an accident has occurred in the section. When the narrowing means 6 verifies by the verification means that no accident has occurred in all the sections extracted by the extraction means, it is included in the union obtained by the union means. Narrow down the section where the accident occurred from the section. Finally, the output means 7 outputs the results determined by the verification means and the narrowing means.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
To do. FIG. 1 is a diagram corresponding to claims relating to the present invention, and FIG. 2 is
A hardware configuration diagram showing this embodiment, and FIG. 3 shows this embodiment.
In the flowchart for explaining the operation of the device according to the example
is there. In FIG. 1, reference numeral 1 is a power failure judging means,
Fixed means 1 has a power failure due to an accident when an accident occurs in the power system
Determine the section. 2 is a union means, and this union means 2
In the event of a power system accident, the
From the report, within the protection range of each protective relay, due to an accident
Take the union of the sections that have lost power. 3 is obtained by the union means 2
Extractor for extracting each section included in the union
Stages 4 have an accident in the section taken out by the extraction means 3.
However, the protection relay is protected by knowledge of the operating principle of the protection relay.
To simulate the behavior of the circuit breaker and trip breaker
The simulation means 5 and the simulation means 4
It should be assumed that there is a better accident
Compare the relay and trip breaker with the actual operating information.
And an accident occurred in the section extracted by the extraction means 3.
Verification means 6 for verifying whether or not
No accidents have occurred on all the sections
And the verification means 5, the union means
An accident occurred from the section included in the union obtained by
Means for narrowing down the sections that have been used based on empirical knowledge, 7
Outputs the results determined by the verification means 5 and the narrowing means 6.
Output means.

A hardware configuration as shown in FIG. 2 is used to determine the accident section. In FIG.
8 is a transmission system for transmitting online information such as operation protection relay information and tripped circuit breaker information, 9 is this transmission system 8
It is a communication control device for controlling the online information of. 10
Is a central processing unit that determines the accident section. This is a working memory that serves as a database common to the system for temporarily storing the above online information and for storing the data necessary for executing the subsequent accident section determination. Is provided. Reference numeral 11 is an external memory for storing, as a production memory, knowledge of the operating principle of the protective relay necessary for the simulation means 4 and empirical knowledge necessary for the narrowing means 6. A knowledge base is constructed by the production memory and the working memory, and the knowledge base is controlled by the inference mechanism provided in the central processing unit 10. Reference numeral 12 is an image display device that displays the accident determination result, and 13 is an output device that records the accident determination result.

FIG. 3 is a flow chart for explaining the operation of the apparatus according to this embodiment, FIG. 4 is a view for explaining the operation of the union means in the apparatus of this embodiment, and FIG. 5 is a verifying means and a narrowing means in this apparatus. 6 is a diagram for explaining the operation of FIG. First, in the flow chart of FIG.
Steps ST1 and ST2 are processes of the power failure judging means 1, steps ST3 are processes of the union means 2, steps ST4 are processes of the extracting means 3, steps ST5 are processes of the simulation means 4, step ST6 is processes of the verifying means 5, and steps ST8 is processing of the narrowing means 6. Step S
The processing of T3 is specifically performed as follows. In FIG. 4, there are sections A to D, and when the relays a to d in these sections are "1", the operation is performed, and when the relays "d" are "0", the operation is not performed. When these sums “2”, “2”, “4”, and “0” are taken, the union set is “2”, “2”, “4” of the sections A to C. The simulation in step ST5 is performed by assuming the accident point, estimating the magnitude and the flowing direction of the fault current, and detecting the magnitude and the direction, and determining the relay to operate and the circuit breaker to trip. . The inference and narrowing down in steps ST6 and ST8 are performed as follows. First, in the power system of FIG. 5, if ABIL is the accident point, there is knowledge that the protection relays RY1 and RY2 operate and the circuit breakers CB1 and CB2 trip.
Actually, it is assumed that the breakers CB1 and CB2 trip due to the operation of the protection relays RY1 and RY2. When inferring, it is assumed that ABIL is an accident, and based on the above knowledge, the protection relays RY1 and RY2 operate and the circuit breaker CB is activated.
1, infer that CB2 should trip. At this time,
Actually, the protection relays RY1, RY2 and the circuit breaker CB1,
CB2 operates. Therefore, applying the above knowledge, ABI
L is determined to be an accident. Narrowing down is based on all accidents, and even if the accident section is applied, if it does not match the actual operation of the protection relay and circuit breaker, the empirical knowledge is applied to determine the accident section from the union described above. .

Next, the operation of this embodiment will be described using a flow chart. When an accident occurs in the power system, the activated protective relay information and the tripped circuit breaker information are initialized in the working memory in step ST1. Next, in step ST2, the section in which the circuit breaker tripped causes a power failure, is set in the working memory, and in step ST3, the knowledge of taking the union of the protection ranges of the protection relays stored in the external memory 11 is stored in the central processing unit 10. It is applied to the power failure section set in ST2 in the working memory by the inference mechanism, and a set of power failure sections having a possibility of an accident section is set in the working memory. Then, in step ST4, the knowledge for extracting any one section from the set is collated by the inference mechanism with the union set in step ST3 in the working memory, and the section to be noted is set in the working memory. To be done. In step ST5, the above step ST
If the section focused on in 4 is an accident, a protective relay that operates and a circuit breaker that trips are connected to the external memory 1
The inference mechanism collates the knowledge about the operating principle of the protective relay stored in 1 to perform simulation, and the result is set in the working memory.
In step ST6, the simulation result set in step ST5 is compared with the actually operated protection relay information and the trip circuit breaker, and the knowledge about the false response of the protection relay and the circuit breaker is collated by the inference mechanism. It is judged whether there is a possibility of an accident in the section taken out in.

Next, in step ST7, step S is performed for all sections belonging to the union in the working memory.
It is determined whether or not the processes of T4 to ST7 have been performed, and it is determined whether or not the processes of steps ST4 to ST6 have been performed on all the sections, and if the processes have been performed, step ST
If no processing has been performed, proceed to step ST4.
The processing of ST6 is continued. Next, in step ST8, when it is determined in step ST6 that there is no possibility of an accident for all the sections included in the union set in the working memory, the operation protection stored in the external memory 11 is stored. Empirical knowledge that narrows down the fault section from the pattern of the relay and trip breaker is collated by the inference mechanism, and the process of selecting the fault section is performed.

[0013]

According to the present invention, at the time of a power system accident, a power failure section that may have an accident is extracted from the operation information of the circuit breaker and the protective relay, and a power failure section that has an accident from that section. Is inferred by comparing the simulation result with the actual operation information from the knowledge of the operation principle of the protective relay, and determines the accident section, and judges that no accident has occurred in all the extracted sections. In case of an accident, the accident section is determined by inferring the section where the accident occurred from the blackout section that may have occurred by empirical knowledge. There is an effect that it is possible to make a high-speed determination of the section that has been made and to increase the reliability of the determination.

[Brief description of drawings]

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

FIG. 2 is a hardware configuration diagram showing an accident section determination device of a power system according to an embodiment of the present invention.

FIG. 3 is a flowchart showing the operation of the device according to the embodiment of the present invention.

FIG. 4 is a diagram for explaining the process of taking the union of FIG.

FIG. 5 is a diagram for explaining the inference and narrowing processing of FIG.

[Explanation of symbols]

 1 Blackout Determining Means 2 Union Means 3 Extracting Means 4 Simulation Means 5 Verification Means 6 Narrowing Means 7 Output Means 8 Transmission Systems 9 Communication Control Units 10 Central Processing Units 11 External Memory 12 Image Display Devices 13 Output Devices

Claims (1)

[Claims] 1. A fault section determination device of a power system for determining a section in which an accident has occurred by incorporating operation information of a protective relay and operation information of a circuit breaker tripped from the protective relay when an accident occurs in the power system, When a power system accident occurs, the union means and the union means for taking the union of the sections of the power outages due to the accident within the protection range of each protective relay are obtained from the operation information of the above protective relays and circuit breakers. The extraction means for extracting the sections included in the union set one by one and the operation of the circuit breaker tripped with the protection relay based on the knowledge of the operation principle of the protection relay if there is an accident in the section extracted by the extraction means. The simulation means for simulating, and the protective relays and trips that should operate when assuming that there was an accident obtained by this simulation means. Verifying whether the accident occurred in the section extracted by the extraction means by comparing the broken circuit breaker with the actual operation information, and for all the sections extracted by the extraction means When it is verified by the verification means that no accident has occurred, a narrowing-down means for narrowing down the section in which the accident has occurred from the sections included in the union obtained by the union means, the verification means and the narrowing-down And a means for outputting the result of the judgment by the means.