JPH04299015A - Device for detecting and locating fault of electric power system - Google Patents

Abstract

PURPOSE:To display the judgment result of a device for detecting and locating a fault of an electric power system after examining the propriety of the result. CONSTITUTION:A system state preserving means 31 preserves state-change data before and after the occurrence of a fault in system state data 5. When a fault occurs, a fault judging means 33 infers the fault based on fault judgment knowledge data 6 held by a fault knowledge preserving means 32 and system information before and after the fault. On the other hand, a fault reproducing means 34 which simulates the operation of protective relays simulates that which protective relay and switch operate when a fault occurs at the location where the fault is judged to have occurred from a before-fault system. Then a fault simulation result comparing means 35 compares the simulation result with the states of the protective relays and switches when the fault occurs and the propriety of the judgment result of this device is confirmed based on the comparison result.

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 determination device for automatically determining the section, aspect, and content of an accident in a power system based on information observed from the power system in a power system monitoring and control system.

0002

[Prior Art] In electric power system monitoring systems, accident determination is performed, and for this purpose, accident determination processing is automatically performed by intelligent reasoning based on system information such as relay information (especially Kaihei No. 1-43022). Here, the operator uses his/her specialized knowledge and experience to confirm whether the accident determination output result is correct or not.

0003

[Problem to be Solved by the Invention] According to the above-mentioned conventional method, the operator himself/herself makes the accident determination;
This places a heavy burden on the operator, and requires an operator with specialized knowledge and experience to confirm whether the accident determination results are correct or incorrect. The present invention has been made in view of the above circumstances, and enables the obtained accident determination result to be reproduced by a relay operation simulating device, and after confirming the correctness of the determination result, to present the result to the operator. It is an object of the present invention to provide an electric power system accident determination device that reduces the burden on operators and allows even operators who do not have specialized knowledge about electric power systems to confirm the correctness of accident determination results.

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides system state storage means 31, accident judgment knowledge storage means 32, and accident judgment In addition to the means 33, an accident reproduction means 34 by simulating the operation of a protective relay, and an accident determination and accident reproduction result comparison means are newly added.

[0005]

[Operation] Based on the accident determination results obtained by the accident determination system and the system before the accident, which protective relays and switches will operate if an accident occurs at the determined accident location, are simulated, and the protective relays and switches are activated in the event of an accident. By simulating the trip operation, it is possible to reproduce the determined accident. By comparing the accident reproduction results with the results obtained by the accident determination system, the accuracy of the determination results can be automatically confirmed with high reliability.

[0006]

[Embodiment] An embodiment will be described below with reference to the drawings. Figure 1
1 is a functional block diagram of an embodiment of a power system fault determination device according to the present invention. FIG. In FIG. 1, reference numeral 1 indicates a target system for determining an accident, and reference numeral 2 indicates a power system information input device using a transmission line. Reference numeral 3 designates the power system accident determination device of the present invention, which includes a system state storage means 31 for storing the system state during steady state and immediately after an accident occurs, an accident determination knowledge storage means 32 for storing knowledge for making an accident determination, It is comprised of an accident determination means 33, an accident reproduction means 34 by simulating protection relay operation, and a comparison means 35 for comparing the accident determination result and the simulation result. 4 is means for displaying the accident determination results; 5 is system status data that stores the system status before and after the accident; and 6 is accident determination knowledge data. Note that solid line arrows indicate the flow of processing, and dotted line arrows indicate the flow of data.

FIG. 2 is a flowchart showing the normal processing of the power system accident determination apparatus having the above configuration. As shown in the figure, under normal conditions, the system status storage means 31 stores the system status in the system status data 5 after a certain period of time.

FIG. 3 is a flowchart showing the processing when an accident occurs in the jurisdiction system. In step S31, the protective relay information and switch operation information that were activated at the time of the accident are transmitted by the transmission line input device 2 as state change data, and the system state storage means 31 stores the system state data 5.
will be saved in In step S32, judgment reasoning is proceeded based on the system information before and after the accident and the knowledge data stored in the accident judgment knowledge data 6 by the accident judgment knowledge storage means 32.

Next, in step S33, the accident reproduction means 34 by simulating the operation of the protective relay is activated, and the operation information of the protection relays and switches of the system before the accident stored in the system status data 5 and the accident judgment knowledge storage means are activated. The information on the accident location and accident situation determined by 32 is input, and the system simulates which protective relays and switches would operate if an accident actually occurred at the accident location determined from the pre-accident system state. , the accident is reenacted.

[0010] The operating relay/switch simulated in step S33 is determined in step S34 by using the accident determination and accident reproduction result comparison means 35, and the operating relay/switch at the time of the accident stored in the system status data 5 is determined. A comparison is made with In step S34, the correctness of the determination result is confirmed based on the comparison result, and the final accident determination result is displayed.

According to the above embodiment, the pre-accident system information and
By inputting the judged accident location and accident aspect, you can check which protective relays or switches on the system will operate and trip if the accident shown in the judgment results actually occurs from the pre-accident system. By simulating the occurrence of tripping and comparing the simulated results with the protective relays and switches that actually tripped, it is possible to automatically check whether the obtained determination results are correct or not. can greatly contribute to

0012

[Effects of the Invention] As explained above, according to the present invention, it is possible to automatically check whether the determination result is correct or not by using the protective relay operation simulating means, which not only reduces the burden on the operator, but also reduces the burden on the operator. Even an operator without knowledge can confirm whether the power system accident determination result is correct or incorrect.

[Brief explanation of drawings]

FIG. 1 is a block configuration example diagram of an embodiment of a power system fault determination device according to the present invention.

FIG. 2 is a flowchart showing processing contents during normal times.

FIG. 3 is a flowchart of processing contents at the time of failure in the embodiment.

[Explanation of symbols]

1 Jurisdictional system 2 Transmission line input device 3 Accident determination device 31 System state preservation means 32 Accident judgment knowledge storage means 33 Accident determination means 34 Protection relay operation simulation means 35 Judgment result simulation result comparison means 4 Display means 5 System status data 6 Accident judgment knowledge data

Claims (1)

[Claims] [Claim 1] A power system fault determination device that collects power system information through a transmission line, determines and displays faulty equipment in the power system based on each piece of information, and stores power system status information. A system state storage means, an accident judgment knowledge storage means for storing rules for determining accident equipment and accident aspects from operating conditions of protective relays, information stored by the system state storage means, and an accident judgment knowledge storage means. Accident determination means uses determination rules to determine accidents, and the power system information stored in the system state storage means sets accident equipment and accident conditions to simulate the operation of protective relays, and prevents accidents from occurring. An accident reproduction means by simulating the operation of a protective relay that reproduces the accident, protective relay operation information that is the result of the accident reproduction means, accident determination and accident reproduction results that compare the information of the tripped switch and the information from the power system. An electric power system accident determination device comprising a comparison means and a display means for displaying an accident determination result.