JPH0785627B2 - Power system monitoring device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention automatically detects a fault section, aspect and contents of a power system based on information observed from the power system monitoring device, particularly the power system. The present invention relates to a power system monitoring device that makes a judgment.

(Prior art) In the conventional power system monitoring and control system, when an accident occurs in the power system, the open / closed state of the circuit breaker and the operating condition of the protective relay observed from the power system are displayed on the CRT or the monitoring panel. And inform the operator.

In addition, in recent years, a technique for inferring an abnormal operation of a fault section, a fault aspect, a protective relay or a circuit breaker has been developed.

With this technology, when a power system accident occurs, possible combinations of the section in which the accident occurred, the aspect of the accident, and the malfunction / malfunction of the relay, based on knowledge about the power system and past experience. Can be output to inform the operator. This has made it possible to automate the accident determination work that required specialized knowledge and experience.

FIG. 6 is an example of a determination result output of the power system accident determination system according to the conventional technique. As shown in the figure, the relationship between possible combinations of accidents and malfunction / non-operation of equipment is shown separately for each case.

(Problems to be Solved by the Invention) According to the above-described conventional technology, it is possible to output a combination of aspects of each accident, but the following matters that are important for the operator who operates the power system are not clearly indicated, It was insufficient as a monitoring device.

Whether the result of the accident judgment is determined to be a simple accident, whether the result of the accident judgment is obtained assuming the existence of multiple accidents, and the result of the accident judgment is the malfunction of the protective relay or the circuit breaker.
Whether or not it is obtained assuming the existence of a malfunction, in short, the reason why it is insufficient is because of the above-mentioned accident aspect, that is, a simple accident, multiple accidents and malfunction / malfunction of the protective relay or breaker. This is because the actions to be taken by the operator after that are different.

The present invention has been made in view of the above circumstances, and provides an electric power system monitoring device that an operator can intuitively understand by explicitly outputting "the assumption used in the inference process" in the determination result. The purpose is to do.

[Configuration of Invention] (Means for Solving Problems) A configuration for achieving the above-mentioned object is a cause of an accident that can be determined as a result of considering a state of a protection relay and a state of a circuit breaker, The state of the protection relay, the state of the circuit breaker, and the cause of the accident, which can be presumed by assuming an illegal operation of one of these, are output separately.

(Operation) Therefore, in the present invention, as an output at the time of an accident, an accident that is uniquely determined by the state of the protection relay and the state of the circuit breaker, and an accident that is determined by assuming a specific accident state in each of the states And can be displayed separately.

(Examples) Examples will be described below with reference to the drawings.

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

In FIG. 1, 1 is an electric power system of an accident determination target, 2, 3
A transmission device for transmitting observation information such as a circuit breaker and a relay, of which 2 is a transmitting station and 3 is a receiving station. Reference numeral 4 is an electronic computer, and 5 is a CRT display device for displaying the judgment result.

Further, in the computer 4, 41 stores the facility database storing the power system facility information including the observation information, the knowledge about the operation principle of the protective relay, the knowledge about multiple accidents, malfunctions and accidents involving malfunctions. Knowledge base, 42
Is an inference engine that selects the knowledge in the knowledge base 41 and combines it to perform inference processing.

FIG. 2 is a flow chart showing the processing of the electric power system monitoring apparatus shown in FIG. 1, and the operation will be described.

When an accident occurs in the power system 1, the tripped breaker information observed from the power system 1 and the operated protective relay information are transferred to the knowledge base 41 of the computer 4 via the transmitting station 2 and the receiving station 3. The equipment is included in the equipment database, and the accident judgment is performed using the information written in the equipment database.

When the electronic computer 4 recognizes that a power system accident has occurred based on the input circuit breaker information on the trip and the activated protective relay information, at step S21,
"Knowledge about operating principles of relays" in Knowledge Base 41
Take out and operate the inference engine 4 and the section where the accident is occurring and the aspect of the accident (whether it is a short circuit accident, a ground fault accident, etc.)
To judge.

In step S22, "knowledge about accidents involving malfunctions" in the knowledge base 41 is taken out, and the protection relay, the breaker and the malfunction non-operation protection relay that have caused the malfunction by operating the inference engine 42, Determine the faulty section including the circuit breaker.

In step S23, "knowledge about multiple accidents" is extracted by the same method to determine a section in which multiple accidents may occur,
Further, in step S24, the "knowledge about the accident accompanied by the malfunction" is taken out, and the protective relay and the breaker causing the malfunction are determined for all the accident sections determined above.

Finally, in step S25, the judgment results of steps S21 to S24 are classified into cases in which it can be determined as a simple accident, cases in which multiple accidents are assumed to exist, and cases in which protective relays and breakers have malfunctions / misoperations. The information is classified and output from the inference engine 42 of the electronic computer 4 to the CRT display device 5 for display.

In FIG. 2, steps S22, S23, and S24 are described in series, but the order is not limited to this, and the order may be changed, or these may be processed in parallel. Good.

The above is the outline of the operation of the overall configuration of the present invention. The details of the inference processing in each step of the knowledge base 41 and the flowchart of FIG. 2 will be described below.

As described above, the knowledge base 41 includes knowledge about the operating principle of protective relays (hereinafter referred to as relays), knowledge about multiple accidents, knowledge about accidents involving malfunctions of relays or breakers, and malfunctions of relays or breakers. Knowledge of the accidents involved is provided and examples of these knowledge are described below.

Example of knowledge about relay operation principle Judge the section from relay knowledge (RY, ANSWER):-Relay (RY, "50S", CB,-, ON), power source (LINE, CB), parallel 2 lines Investigate (LINE), ANSWER = [LINE, "short circuit including 2LG"] where RY is relay, CB is circuit breaker, LINE is power line, ANSW
ER is the judgment result, and ON is the operation.

And this is "a short circuit balance relay (50S) installed at the power source end of the transmission line operates during parallel two-circuit operation, the protection section (= accident section) is the transmission line and the appearance of the accident is 2LG.
It is a short circuit including. ] Is described in the PROLOG language.

Example of knowledge about multiple accidents Parallel 4 terminals (OBJECTS, ANSWER):-Check if the two terminals on the power supply side are cut off (OBJECTS), Check if two circuits trip with different range limited relays (OBJECTS), ANSWER = OBJECTS However, OBJECTS Is the transmission line name.

This is a PORLOG description of "In a parallel two-line two-terminal system, multiple accidents may occur if the power supply side is cut off by both range-limited relays."

Example of knowledge about accidents involving malfunctions Determine the malfunctions at your own end (CB, ANSWER): − Power end (LINE, CB), Relay (RY1, TYPE, CB, DIRECT, ON), Directional relay Check if it is (TYPE), and if the specific operating range relay is not working (TYPE, CB, RY
2), ANSWER = [CB, RY2] where TYPE is the relay type and DIRECT is the relay protection direction.

This means that if the directional relay interrupts the specified operating range relay and the terminal that has the directional relay that includes the operating range at the power source end of the transmission line, the accident is within the specified operating range and the specified operating range relay There is a possibility of malfunction and malfunction. ”Is described in PORLOG.

Examples of knowledge about accidents involving malfunctions, determine malfunctions (RY, OBJECT, ANSWER):-Search malfunction relays (RY, OBJECT, FRY1), check malfunction relays (FRY1, FRY2), ANSWER = [ OBJECT, FRY2], where FRY is the type of relay.

This is a PORLOG description of "If a relay that should have been inoperative operates in the expected accident section, the relay may malfunction".

Next, referring to FIG. 3, steps S21, S22, S23, S2 of FIG.
The inference process in 4 will be described. First, step S
At 31, the equipment data including the circuit breaker and the operation relay is taken out from the equipment database of the knowledge base 41 of the computer 4.

Next, in step S32, one rule is extracted from the rule base of the knowledge base 41. Then, in step S33,
It is determined whether the extracted equipment data satisfies the condition part of the rule. Here, if all the conditions in step S33 are satisfied, the process moves to steps S34, S35, S36 to execute the conclusion part of the application rule, and the conclusion (ANSWER) is stored as the determination result. This is repeated for all rules. Such processing is carried out in steps S21, S22, S23 and S24 of FIG.

Next, the processing content of step S25 of FIG. 2 will be described with reference to the flowchart shown in FIG.

In step S41 of FIG. 4, the determination result stored in step S36 of FIG. 3 is retrieved, and in step S42, the following six cases are classified.

Case 1. Simple accident Case 2. Simple accident and malfunction of relay or breaker Case 3. Simple accident and malfunction of relay or breaker Case 4. Multiple accident Case 5. Multiple accident and malfunction of relay or breaker Case 6. Multiple Accident and Malfunction of Relay or Breaker Next, in step S43, the determination result stored in step S36 and any one of the six case names to which it belongs are output.

The results of the above processing are classified and output for each expected accident case as shown in FIG.

As is clear from the above description, the results of accident determination are classified into expected accident cases and notified to the operator, so that even in an emergency, the operator can grasp the accident situation and take corrective action quickly. It becomes possible to take

In the above embodiment, for the sake of simplicity, it is assumed that the malfunction or malfunction of the relay or the circuit breaker does not occur at the same time, and "knowledge about accident involving malfunction" and "knowledge about accident involving malfunction". Was configured separately. This can be empirically said from the operation data of the power system, but if it is assumed that malfunction of one relay or breaker and malfunction of another relay or breaker occur at the same time, Such a configuration may be used.

[Effects of the Invention] As described above, according to the present invention, it is assumed that an accident cause that is uniquely determined at the time of accident determination and an illegal operation of either the state of the protection relay or the state of the breaker are assumed. Since the accident causes classified according to the accidents are output separately, the operator can intuitively understand,
It enables quick response in an emergency.

[Brief description of drawings]

FIG. 1 is a functional block configuration diagram of an embodiment of a power system monitoring device according to the present invention, FIG. 2 is a flowchart showing the processing of FIG. 1, and FIG. 3 is steps S21, S22, S23, S24 of FIG.
2 is a detailed flowchart of the inference processing in FIG.
FIG. 5 is a detailed flowchart showing the processing contents of step S25 in the figure, FIG. 5 is an example of the determination result output according to the present invention, and FIG. 6 is an example of the determination result output of the conventional power system accident determination system. 1 ... Power system, 2 ... Information transmission device (transmission station) 3 ... Information transmission device (reception station) 4 ... Computer, 41 ... Knowledge base 42 ... Inference engine, 5 ... CRT display device

Claims (1)

[Claims] 1. A monitoring device for determining the cause of an accident that has occurred in a power system by inputting a protection relay installed in a power system and the state of the circuit breaker, taking into consideration the state of the protection relay and the state of the circuit breaker. As a result, the cause of the accident that can be unambiguously determined and the cause of the accident that is classified for each accident that is assumed when an erroneous operation of either the state of the protection relay or the state of the circuit breaker are assumed to be output separately. An electric power system monitoring device.