JP2786710B2 - Accident detection processing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Industrial application field) The present invention relates to an accident detection processing device in a power system.

(Prior Art) FIG. 5 shows an example of an accident detection system of an accident detection device in a general central power supply command center computer system. Power system breaker (CB), disconnector (LS), protection relay (RY)
And the like, and system information including numerical information such as a line power flow value and a generator output value are sent to a central power supply command center (hereinafter referred to as a middle supply) via an information transmission line 51. The system status is grasped based on the system information.

The accident detection device is one of the functions incorporated in the computer system of the middle pay. The accident detection process 54 in the conventional accident detection device uses the CB / RY operation data 53 indicating the operation of the protection relay and the ON / OFF state of the switch, which are taken into the middle supply computer system by the binary information input process 52, The fault detection is performed based on the protection relay operation information alone, or the protection relay operation information based on a combination of a protection relay and a switch, which are activated in the event of an accident and defined in advance in a database or the like, and the switch operation information.

That is,... Protection relay operation, that is, an accident occurs on the line.

... An accident occurs on the line due to the protection relay operation and the corresponding generator or load circuit breaker disconnection operation.

In the method of (Problems to be Solved by the Invention), an accident is determined only by the operation of the protection relay. Therefore, even if the protection relay does not operate for some reason despite the fact that no accident has occurred, the Judgment has made the reliability problem.

For example, in the case of the overload, when an overload occurs, it cannot be detected unless a large accident involving a switch operation such as shutting off a generator (or load) in order to eliminate the overload at the same time as the protection relay operation. was there.

The present invention has been made in view of the above circumstances, and has higher reliability than a conventional fault detection method using only a protection relay operation, and more detailed than a fault detection method combining protection relay operation and switch operation. It is an object of the present invention to provide an accident detection processing device capable of detecting an accident.

[Constitution of the Invention] (Means for Solving the Problems) The present invention is not an accident detection method in which protection relay operation information is combined with switch operation in the related art, but a new numerical information such as a generator output is input and operated. The fact that the numerical information has changed by a predetermined value or more within a predetermined time after the generation of the information is set as an accident determination condition.

(Operation) FIG. 4 is a timing chart showing the operation of the protection relay and the movement of numerical information in detecting an accident. An accident detection method combining protection relay operation information and numerical information will be described with reference to FIG.

Now, if protection relay operation 41 occurs for some reason,
In the accident detection process, a search is made to see if there is any sudden change in numerical information within a certain time t42 of the operation of the protection relay. With sudden change 43 of numerical information,
It is defined in advance in a database or program. That is, the amount of change Δp of the numerical information changed within the numerical information sudden change comparison time width Δt seconds is equal to or larger than the allowable change amount previously defined in the database or the program. If a sudden change 43 in the numerical information is detected, the accident detection processing determines that the protection relay operation 41 is a normal operation, and assumes that an accident has been detected, and performs notification to a human system, accident countermeasure processing, and the like.

(Example) Hereinafter, an example is described with reference to drawings.

FIG. 1 is a functional block diagram showing a configuration example of an accident detection processing device according to the present invention, and shows a power system accident detection device.

In FIG. 1, 1 is a power system, and 2 is a central power supply command center. In the power system, 11 is an information transmission device for transmitting the ON / OFF state of the switch and the operation state of the protection relay in the power system to be monitored, and 12 is the binary information transmitted by the transmission device 11. Binary information input processing to be taken into the electronic computer 13 is protection relay operation information accumulated by the binary information input processing 12.

On the other hand, numeral 14 is a numerical information input process for taking in the numerical information transmitted by the information transmission device 11 into the computer, numeral 15 is numerical information accumulated by the numerical information input process 14, and numeral 16 is an accident detection process. The information 13 and the numerical information 15 are collated based on a predefined combination, and when a combination to be handled as an accident is detected, this is regarded as accident information, and this information is notified to human systems and accident countermeasure processing, etc. This is the processing to be performed.

The operation of the accident detection device having the above-described mechanism will be described using the operation of a transmission line overload detection relay (hereinafter, referred to as an OL relay) on a power system as an example.

 FIG. 2 is a schematic diagram of a power system.

In FIG. 2, G1 to G4 represent generators, and L1 to L4 represent power supply to lower systems (hereinafter referred to as loads). In addition, a group of systems managed by each power station in the entire power system is represented by a system A and a system B in the figure, and a transmission line connecting the systems is represented by a connection line L. The power flow flowing through the interconnection L is represented by P, and the direction of the power flow is represented by an arrow. Further, RY indicates a system protection device including an overload detection relay (hereinafter referred to as an OL relay), and a broken line from RY to G1 to G4, L1 to L4 detects an overload in the power flow of the interconnection line L. Means a power generation adjustment or cutoff command for the generator and a cutoff command for the load.

In the power system shown in FIG. 2, when the load on the A system side increases, the generators G1 and G2 on the A system side increase the output, but when the load cannot keep up, the interconnection between the A system and the B system The tide P on the line L increases.

When the tidal current P exceeds the allowable value,
The OL relay operates, and the on-site system protection device
An output increase command or a load shutoff command for the loads L1 and L2 is issued to the system generators G1 and G2, and an output decrease command or a generator shutoff command is issued to the system B generators G3 and G4.

If the generator or load is interrupted here, this information is transmitted to the middle pay as binary information. But,
As for the command to increase or decrease the generator output, the fact that the generator output has been changed by this command is transmitted as numerical information up to the middle supply, but the command itself cannot be captured in the middle supply. Therefore, in the conventional method of detecting an accident by combining the operation information of the protection relay and the OFF information of the circuit breaker, if the generator or load is interrupted for the OL relay operation, the accident can be detected. If the output is adjusted by increasing or decreasing the output, an accident cannot be detected.

According to the present invention, the numerical information input process 14 in FIG.
A function to detect a sudden change in the analog telemeter value (in this example, the generator output value) is added, and the OL relay is activated, and the corresponding sudden change in the generator output is a certain time t / 2 of the OL relay operation.
If it occurs within seconds, the OL relay is considered to be operating normally. That is, it is determined that the transmission line overload accident actually occurs, the OL relay operates, and the up / down command of the generator is issued.

An abrupt change detection function of an analog telemeter taking an abrupt change in the generator output as an example will be described with reference to the flowchart in FIG. The activation request is issued for this process after the OL relay operation time + t / 2 seconds. Current time in 301
Set t _e , check start time t _s , and comparison time t _n . At 302, the generator output P ₁ at time t _n is extracted, and at 303, t
take out the generator output P ₂ of _n + _Δt. From t _{n at} 304
The generator output change amount ΔP between t _n + Δt is calculated, and it is checked at 305 whether or not this ΔP is within an allowable amount defined in advance in a database or the like. The output sudden change information such as the occurrence time, the generator number, and the output change amount is stored. At 307, the comparison time t _n is updated, and at 308, it is checked whether the processing from t _s to t _e has been completed.
Repeat the process from. If the processing from t _s to t _e is completed for one generator, it is checked at 309 whether the processing has been completed for all the generators to be processed, and if not completed, the comparison time t _n is initialized at 310. After that, the process from 302 is repeated.

When all the above processes are completed, it is checked in 311 whether at least one sudden change in the generator output has occurred, and if it has occurred, the occurrence of an accident is notified to a human system in 312 and trouble measures are taken.

The present invention is, of course, not limited to the above embodiment, and various types of accident detection can be performed by defining a combination of binary information and numerical information.

[Effects of the Invention] As described above, according to the present invention, erroneous detection of an accident due to a malfunction of a relay can be prevented, and high reliability is provided even for an accident that does not involve the operation of a circuit breaker. Accident detection becomes possible.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a power system accident detection apparatus shown as an embodiment of the accident detection processing apparatus of the present invention, FIG. 2 is an example of a power system, FIG. FIG. 4 is a timing chart of an accident detection using a combination of binary information and numerical information, and FIG. 5 is a functional block diagram of a conventional power system accident detection device. 11 Information transmission device, 12 Binary information input processing 13 Protection relay operation information 14 Numeric information input processing, 15 Numeric information 16 Accident detection processing

Claims (1)

(57) [Claims] An accident detection processing device for collecting system information of a power system in real time through a transmission line and detecting an accident in the power system based on the collected information. An accident detection processing device characterized in that a change in numerical information, such as a generator output or a line power flow, within a predetermined time after information generation has changed by a predetermined value or more is used as an accident determination condition.