JPH0697811B2 - Accident facility determination method for power system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an accident facility judgment method for a power system, and in particular, automatically creates an accident recovery signal from wide area system information using an electronic computer. The present invention relates to a method of determining the equipment required in each case.

[Conventional technology]

To determine the accident equipment in a power system accident, the operator of the power station operated due to the accident, confirmed the operation status of the disconnector and protective relay, and analyzed the accident using the information obtained from the operation status. , It took a lot of time to recover from the accident because the accident equipment was judged comprehensively.

For example, when an accident occurs within the jurisdiction of a certain power supply station, the operator of that power supply station collects the operation information of the ladder, the circuit breaker and the protective relay, and the collected operation information of the tree and the circuit breaker is the operation information by the main protection. Check if there is any, and if it is operation information due to backup protection, estimate the accident equipment by combining them, and in some cases check possible malfunctions or malfunction of the breaker or malfunction of the corresponding protective relay. And finally, the accident equipment was judged.

Since the conventional judgment of the accident equipment is made by the judgment of the operator of the power supply station as described above, a skilled operator is necessary for the judgment. Especially in recent power systems that are becoming huge and complicated, when multiple accidents occur, the analysis is difficult, and it takes a long time to judge the accident equipment, or the time varies depending on the experience and ability of the operator. There was a problem such as getting hot.

With the enormous and complicated power system and the increase of social impact, it is desired that the accident recovery operation be speeded up and the reliability be high in order to measure the more stable supply of electric power. Kaisho 57-71215 and others).

[Problems to be solved by the invention]

When an accident occurs in the power system under the jurisdiction of a certain power supply station, the operation information of the power supply station, the disconnector, and the protective relay are collected,
The problem that it takes time for the final accident equipment to be judged because the operator judges it by checking whether it is the information of main protection or backup protection, that a skilled operator is required, the operator's individual There were problems such as differences.

An object of the present invention is to perform an automatic restoration operation using a power system control computer, to capture operation information of a disconnector and a protective relay, and to use such information to determine a faulty facility in a power system at high speed. It is to provide an automatic accident equipment determination method with high reliability.

[Means for solving problems]

The present invention, when a plurality of protective relays operate when an accident occurs in a power system, when there is equipment commonly included in the protection range of those operation protective relays, the equipment is determined to be an accident equipment, and When there is no equipment commonly included in the protection range or when there is only one operation protection relay for each, it is characterized that the equipment included in the protection range is determined to be an accident equipment.

[Action]

In order to accumulate the operation information of the relay, the breaker, and the protection relay for a predetermined time, and to judge the equipment commonly included in the protection range of the protection relay as the accident equipment, the judgment logic should be clear and the judgment should be made at high speed. You can

〔Example〕

A power system accident equipment determination method according to an embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, when an accident occurs in the power system, the operating states of the disconnector and the protective relay are input to the central processing unit 1 through the communication transmission system 3 and the input / output device 2. The central processing unit 1 stores the operation information of the input breaker, the breaker and the protective relay for a fixed time (for example, 15 seconds) in consideration of the correction of the transmission data irregularity due to the transmission delay and the stabilization time of the system state. Then, the accident equipment is judged from the accumulated information as follows.

FIG. 2 is a flow chart showing the principle of the system of the present invention. When an accident occurs in the power system, the operation information of the breaker and the breaker and the protection relay are accumulated for a certain time in the processing step 4 to detect the accident. Whether or not a power failure has occurred is determined based on the information stored in the processing step 5 and the operation information of the disconnector. When there is no power failure, the processing is stopped, and when there is a power failure, attention is paid to the power system that has a power failure due to the operation information of the switch 6 and the disconnector.
Next, in processing step 7, the number of protective relays operating in the power system of interest is checked by processing step 6, and if one, the processing branches to processing step 13, and if there are a plurality, the processing branches to processing step 8. In processing step 8, the protection ranges of the protective relays checked in processing step 7 are extracted, and in processing 4, the extracted protection ranges are compared to see if there is an overlapping range. The included equipment is regarded as the accident equipment, and the process returns to the process 9. If the overlapping range (that is, the shared range) does not exist or disappears, the process 11 checks whether there is a protection range that does not overlap any protection range. That is, in processing step 7 in the processing flow of FIG. 2, the processing of steps 8 and 9 was performed because there were a plurality of activated protective relays, but in the end it was determined that there was no shared facility due to the relationship with other relays. The equipment within the protection range of the relay is judged as the accident equipment. The equipment included in all the protection ranges extracted by the processing steps 11 and 19 is regarded as an accident equipment, and the processing of this flow chart is finished. If only one motion protection relay is extracted in process 7, the protection range of the motion protection relay extracted in process 7 is extracted in process 13, and the equipment included in the protection range is treated as accident equipment in process 14. End the flow. Here, in the processing step 10, from the relationship between the number of operated relays and the equipment shared as the protection range, it is determined as the faulty equipment in order from the one having the largest number of shared relays. Then, in processing step 19, processing step 10
It is determined whether or not there is any equipment included in the common protection range in addition to the equipment judged as the accident equipment in step S9, and the process returns to step 9. By repeating this, the accident equipment is sequentially judged. As a result, a plurality of relays operated in step 7 and the processing from processing step 8 onward was performed, but after all, there was no shared equipment, and the judgment of the accident equipment was made in the same way as extracted in steps 13 and 14. It is carried out. Next, a few cases will be described.

In the example shown in Fig. 3, the C1 and C2 switches and breakers were opened by the protective relay due to an accident on the interconnection line L1. In this case, the protective ranges of the two protective relays are extracted as the wavy line portions R1 and R2 in the process 8 through the processes 4 to 7, and it is determined in the process step 9 that there is a common protective range, and The equipment within the common protection range, that is, the transmission line L1 is determined to be the accident equipment. Next, in the case of the example of FIG. 3, since there is no other common protection range and independent protection range,
Through the processing steps 9 to 11, the entire processing for determining the accidental facility is completed. Here, C1 and C2 represent breakers and disconnectors, L1 represents a transmission line, B1 and B2 represent bus lines, and point P1 represents a ground fault occurrence point.

The example in Fig. 4 shows the operation of the protective relay with the broken line section R3 as the protection range and the operation of the circuit breaker C3 in the event of the distribution S1 due to the operation of the protective relay with the wave line section R4 as the protection range. C4 and the breaker C5 are opened by the operation of the protective relay having the protection range in the broken line portion R5. In this case, the equipment included in the common protection range of the protection ranges R3, R4, and R5 of the three protective relays is the distribution change S1.
Is determined to be the accident equipment. It is possible to determine that the shared equipment of the relay operated in this way is the accident equipment. Then, the power transmission line L2 is the power transmission line in which a power failure has occurred, and this system is the target of accident recovery. Further, in FIG. 4, even if some of the breaks and breakers are not opened due to a malfunction of the protective relay, according to the embodiment of this method, at least the distribution change S1 is extracted as an accident facility, and reliable and reliable. Accident equipment can be determined.

The example in Fig. 5 is a simultaneous accident of the distribution changes S2 and S4, and the operation of the protective relays with the wavy line parts R6, R7, R8 and R10 in the protection range causes the breakers C6, C7, C8 and C10 It is open. In this case, the range common to the protection ranges R6, R7 and R8 and the range common to the protection ranges R6, R7 and R10 are extracted as independent common protection ranges, and the equipment included in these common protection ranges, that is, the distribution It is determined that S2 and distribution change S4 are accidental facilities.

FIG. 6, FIG. 7, and FIG. 8 conceptually show these accident equipment determination methods and correspond to the embodiments of FIG. 3, FIG. 4, and FIG. In Fig. 7, it is judged that the accident equipment exists in the shaded area common to the three areas R3, R4 and R5. In Fig. 8, the shaded area common to the three ranges R6, R7 and R8 and the shaded area common to the three ranges R6, R7 and R10 were extracted and it was determined that there was an accident facility. To be done. The concrete method of the determination is to assign the equipment number to each of the equipments subject to the accident determination, store the observable equipment numbers corresponding to the relays C1 to n, extract the equipment numbers common to each area, and extract the equipment numbers. This is a method of determining that the equipment of the designated number is the accident equipment. For example, as shown in FIG. 9, the state change signals of the relays C1 to Cn are taken into the input device 92.
94 is a storage device, for example, the equipment S2, S3,
I remember that S4 is the target. The same applies to C2 and C3. If the relays of C1 to C3 are operated, the data is read out to the arithmetic processing unit 96 and the shared facility determination process is performed. In the case of FIG. 9, S4 is a shared facility of C1 to C3, and the facility S4 is first judged as an accident facility. next
Since S5 is a shared facility for C2 and C3, it is highly likely that S5 is the fault facility next to S4. And S6 may be the accident equipment due to the operation of C3, and S2, S
Regarding item 3, there is a possibility of accidental equipment due to the operation of C1. When the equipment is judged in this way, S4 → S5 →
The possibility of being an accidental facility is determined in the order of S2, S3, S6. Then, the result can be displayed on the display device 90 or the like to inform the operator of the accident facility (note that 100 indicates a computer).

The power system fault equipment determination method according to the present invention is a system in which the communication system inputs the operation information of the power system, the breaker, and the protective relay to the central processing unit of the power system control computer system through the input / output device. The processing device accumulates these input information for a certain period of time, extracts the operating protective relay from that information, and determines the power equipment that is commonly present in the protection range of the protective relay. Can be determined.

In addition, since the common part of the protection range of the protective relay is judged as the accident equipment, at least the true accident equipment is extracted by extracting the common part of the protection range of the operated protective relay even if the malfunction of the protection relay is considered to be a malfunction. It is possible to determine a plurality of facilities including the one as an accident facility.

〔The invention's effect〕

According to the present invention, accident equipment can be accurately determined.

[Brief description of drawings]

FIG. 1 is a block diagram of means for implementing the present invention, and FIG.
FIG. 3 is a flow chart showing the principle of the method of the present invention, FIG. 3, FIG. 4 and FIG. 5 are diagrams showing examples of system accidents, and FIG. 6, FIG. 7 and FIG. FIGS. 4 and 5 are conceptual diagrams of the method of the present invention corresponding to FIGS. 4 and 5, and FIG. 9 shows an example of the determination processing method in the shared facility determination. B1 to 7 ... Bus, L1 to 3 ... Transmission line, S1 to 4 ... Distribution / transformation equipment, R1 to 8, R10 ... Relay protection, 1 ... Central processing unit, 2 ... Input / output unit, 3 ...... Communication transmission system.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takao Omata 1-3-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Within Tokyo Electric Power Co., Inc. (72) Inventor Hiroshi Kabazawa 1st Toshiba-cho, Fuchu-shi, Tokyo Toshiba Fuchu, Ltd. (72) Inventor Yunao Okudera 52-1 Omika-cho, Hitachi City, Hitachi, Ibaraki Hitachi Ltd. Omika Factory (72) Inventor Shizuka Nakamura 1-1-1 Wadazaki-cho, Hyogo-ku, Kobe-shi, Hyogo No. 2 Mitsubishi Electric Co., Ltd. Control Factory (56) Reference JP-A-57-71225 (JP, A)

Claims (2)

[Claims] 1. A method for determining a faulty facility of a power system, which incorporates the operation information of a protective relay from the power system into a power system calculation control system, wherein a plurality of protection relays are operated based on the operation information. When it is determined, the data about the power equipment included in the protection range of each protection relay stored in advance in the system is read out for each of the activated protection relays, and the power equipment commonly included in the protection range is damaged. A method for determining an accidental facility in a power system, which is characterized as determining the facility. 2. The electric power according to claim 1, wherein the operation information of the protective relay used for the accident determination is limited to the power failure system determined from the switching information of the breaker of the power system. The method of judging the accident equipment of the grid.