JPH02261018A - Decision on accident equipment in electric power system - Google Patents

Abstract

PURPOSE:To make a judgement at high speed and with high reliability by deciding equipment in an accident as such in collating the information on a protective relay, etc., operated in an accident with a preset specialized knowledge and inference mechanism. CONSTITUTION:A service interruption decision means 1 decide equipment of which service is interrupted by an accident when the accident occurs to an electric power system. A means 2 of sum of sets takes a sum of sets of equipments of which service is interrupted within the protecting limits of a protective relay when the accident occurs to the power system. An interference mechanism 4 infers whether there is a contradiction in the operation of the protective relay, etc., based on the knowledge with respect to an operational principle of the protective relay and the knowledge on the incorrect reaction of the protective relay and a circuit breaker as well as an empirical knowledge on the operation of the power system. The result is outputted through as outputting means 5.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention uses a computer or the like to determine the equipment that is required to perform power grid restoration automatically based on wide-area grid information in the event of a power system fault. IA power system accident membrane (i!
This is related to the Ij formula.

[Conventional technology]

As a conventional power system failure equipment determination method, there is one disclosed in, for example, Japanese Patent Application Laid-Open No. 54-97747. This 9
The failure equipment determination method uses a device that inputs breaker operating information and various protective relay operating information, calculates the degree to which this information contributes to accident detection in the protected area, and statistically processes the individual degrees for each protected area. This system replaces the device that calculates the probability of an accident by semi-determining that the probability of an accident occurring is greater in the order of the section with the highest probability of accident.

However, this fault equipment determination method does not provide information that cannot be obtained with the current information transmission system due to its capacity limitations in the event of an accident in the power system, that is, operating information for each relay element that constitutes the sequence of each operational protection relay. Since this method is based on the assumption that the proposed method can be obtained, there is a problem in that it is difficult to apply it to an actual power system control computer.

Therefore, when an accident occurs in the power system, the faulty equipment can be determined by operators at the power supply station checking the operating status of the protective relays and circuit breakers that tripped due to the accident, and using information obtained from the operating status. Because the accident analysis was performed and the equipment involved in the accident was comprehensively determined, it took a lot of time to recover from the accident.

In other words, when an accident occurs within the jurisdiction of an existing power supply station, the operator of that power supply station collects operational information of the breaker and protective relay, and the collected operational information of the breaker is the operational information of the main protection. or equipment protection, and then estimate the equipment where the accident occurred based on a combination of these operating information, and depending on the information at that time, detect possible malfunction of the breaker or corresponding protective relay. A final determination of the equipment involved was made by checking for malfunctions.

[Problems that light ψ” can solve]

Since the conventional power system failure equipment determination method is configured as described above, the failure section of the power system must be determined based on the highly intelligent judgment of the power supply station operator, and therefore requires the assistance of a skilled operator. Is required. Furthermore, when complex accidents such as multiple accidents or blind spot accidents occur, it is difficult to analyze the power systems, which have recently become larger and more complex, and it takes a long time to determine which equipment has failed. Furthermore, there was a problem that the judgment time varied depending on the experience and ability of the operator.

This invention was made in order to solve the above-mentioned problems, and it is possible to quickly and reliably determine the faulty equipment in the power system, thereby ensuring that automatic recovery operations can be carried out. [Means for Solving the Problem] The method for determining faulty equipment in an electric power system according to the present invention is based on the premise that faulty equipment is always present in a power outage section, and when an accident occurs in a power system. a union means for taking a union of power outage equipment within the protection range of each protective relay from the operational information of the protective relay or breaker; an extraction means for extracting equipment included in the union obtained by the union means one by one; If there is an accident in the equipment extracted from this extraction means, check whether there is any contradiction in the operation of the protective relay or whether there is a malfunction in the breaker. The system is equipped with an inference means for making inferences based on knowledge about false responses of power systems, experiential knowledge about power system operation, and knowledge about cooperation of protective relays, and an output means for outputting the inference results.

[Effect]

The method for determining faulty equipment in a power system according to the present invention is to extract the power outage equipment that may have caused an accident from the operation information of circuit breakers and protective relays when an accident occurs in the power system, The working principle of the above protective relay,
The faulty equipment is determined by making inferences based on knowledge of the above-mentioned malfunction of protective relays and circuit breakers, empirical knowledge of power system operation, and knowledge of coordination of protective relays.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
1 is a claim correspondence diagram according to the present invention, FIG. 2 is a hardware configuration diagram showing an embodiment of the present invention, and FIG. 3 is a flowchart for implementing the present invention. In the figure, (1) is a power outage determining means, and this power outage determining means (1) determines which equipment has lost power due to an accident when an accident occurs in the power system. (2) is a union means, and this union means (2) takes a union of equipment that has lost power within the protection range of each protective relay from the operation information of the protective relays and circuit breakers when an accident occurs in the power system. (3) is an extraction means that extracts the equipment included in the above-mentioned union one by one, and (4) is an inference means, which assumes that there is an accident in the power outage equipment extracted by the extraction means (3), and the protective relay is Whether there is a contradiction in the operation of the circuit breaker or whether there is a malfunction or malfunction of the breaker is determined based on the operating principles of the protective relay mentioned above, knowledge about the malfunction between the protective relay and the circuit breaker, and empirical knowledge about the operation of the power system. do. (5) is an output means for outputting the inference result of this inference means (4).

Therefore, a hardware configuration as shown in FIG. 2 is used to determine which equipment has failed. (4) is a transmission system that transmits online information such as operational protection relay information and tripped circuit breaker information, (7) is a communication control device that controls the online information of this transmission system (4), and (8) is the equipment in which the accident occurred. This central processing unit is equipped with a working memory that temporarily stores the above-mentioned online information and serves as a system-wide database for storing the data needed to perform future equipment accident determinations. ing. (
Reference numeral 9) is an external memory that stores the judgment knowledge of the accident equipment, and this stores the operator's specialized knowledge regarding protective relays and experiential knowledge such as system operation as production 5 memory. The production memory and working memory constitute a knowledge base, and this knowledge base is controlled by an inference mechanism provided in the central processing unit (8). AO is an image display device that displays the accident determination results, and α vision is an output device that records the accident determination results.

FIG. 3 is a flowchart for implementing the present invention.
A step of detecting information about activated protective relays and tripped circuit breakers; ST2 is a step of detecting equipment that has experienced a power outage due to a tripped circuit breaker following the above step; and ST3 is a step of protecting each activated protective relay following step ST2. The step of setting the union of ranges in the working memory of the knowledge base, ST4 is the step ST3 above.
Step ST5 follows step ST4 to extract any one piece of equipment from the union, and checks whether there are any discrepancies in the operated protective relays of the extracted equipment and whether there is any malfunction of the breaker. The step of making a judgment based on the knowledge stored in the external memory (9) and setting the result in the working memory, ST6, is the step S 'I' described above.
The step ST4 following step s, the step of determining whether the processing of step STs has been applied to all the equipment included in the union of protection ranges, ST7 is step ST6
By applying the knowledge stored in the external memory (9) based on the presence or absence of contradictions in the operation of the protective relays of each equipment included in the union of the protection ranges and the presence or absence of malfunction of the circuit breaker, the accident equipment can be detected. This is the step of determining.

When an accident occurs in the power system, information on the activated protective relay is initialized in the working memory in step STl. Next, in step ST2, the equipment that caused the power outage due to the tripped breaker is set in the working memory, and in step ST3, the knowledge of calculating the union of the protection ranges of each protective relay stored in the external memory (9) is processed by the central processing unit. The inference mechanism of the device (8) collates the power outage equipment set in ST2 in the working memory, and sets in the working memory a set of power outage equipment that are candidates for the failed equipment. Then, in step ST4, the knowledge for selecting an arbitrary piece of equipment from the set is checked by the inference mechanism against the union set in step ST3 in the working memory, and the equipment of interest is set in the working memory. . In step ST5, if the equipment focused on in step ST4 was the accident equipment, whether there is a contradiction in the protective relay information that operated (if there is a contradiction, it is unlikely to be the accident equipment), Whether there is any malfunction or malfunction, the knowledge of the operating principles of protective relays stored in the external memory (9), the knowledge of malfunctioning of protective relays and circuit breakers, and the operator's experiential knowledge of system operation are examined. It is inferred by being collated by an inference mechanism. Next, in step ST6, it is determined whether the processes of step ST4 and step ST5 have been performed on all the equipment belonging to the union in the working memory, and the processes of step ST4 and step ST5 are performed on all the equipment. If the process has been performed, the process proceeds to step ST7, and if the process has not been performed, the processes of step ST4 and step ST5 are continued.

Next, in step ST7, the judgment results obtained in step STs regarding all the equipment included in the union in the working memory are used as knowledge and reasoning to select the equipment with the highest possibility of an accident from the external memory (9). The mechanism performs a process of checking and determining the equipment that caused the accident. That is, in step ST7, when each equipment is assumed to be an accident equipment, the presence or absence of contradictions in activated protective relays, the presence or absence of malfunctions in circuit breakers, and any contradictions from the external memory (9) are determined. A process is performed in which the presence/absence state and the presence/absence state of malfunction or malfunction are compared with the knowledge of whether the equipment has the highest possibility of an accident by an inference mechanism.

〔Effect of the invention〕

As described above, according to the present invention, the power system accident equipment determination method is based on the exclusive knowledge of a skilled operator and a reasoning mechanism preset with information on the protective relays that operated and the tripped circuit breakers when an accident occurred in the power system. Since the system is configured so that the faulty equipment is determined by comparing the faulty equipment with the power system, it is possible to quickly and reliably determine the faulty equipment in the power system, and this has the effect of reliably performing automatic recovery operations.

[Brief explanation of drawings]

FIG. 1 is a complaint correspondence diagram showing a system for determining faulty equipment in a power system according to the present invention, FIG. 2 is a hardware configuration diagram showing a system for determining faulty equipment in a power system according to an embodiment of the present invention, and FIG. 3 is a flowchart for implementing the invention. In the figure, (1) is a power outage determination means, (2) is a union means, (3) is an extraction means, (4) is an inference means, and (5) is an output means. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] When an accident occurs in a power system, the operation information of a protective relay and the operation information of a circuit breaker tripped by the protective relay are taken in, and the equipment in which the accident occurred is determined. When an accident occurs, from the operation information of the protective relay and the circuit breaker, a union means that takes the union of the power outage equipment within the protection range of each protective relay, and the equipment included in the union obtained by this union means is set as 1. If there is an accident in the equipment extracted by the extracting means, the operating principle of the protective relay or the above-mentioned It is characterized by comprising an inference means for making inferences based on knowledge regarding incorrect responses between protective relays and circuit breakers and empirical knowledge regarding the operation of power systems, and an output means for outputting the results inferred by this inference means. A faulty equipment determination method for electric power systems.