JPS59191442A - Power system recovery system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a restoration method when a system fault occurs in an electric power system.

[Technical background of the invention and its problems]

In the power system as shown in FIG. 1, a conventional system fault recovery procedure will be described when a fault occurs on the line 23 and the circuit breakers 23-a, 24-a, and 25-a trip. The circuit breaker 23-a is closed by the re-closing device (R・EC) 23-b. Upon successful re-closing of the circuit breaker 23-a, the circuit breakers 24-a and 252 are re-closed by the re-closing devices 24-b and 25-b. Grid restoration is performed through the above operations. However, 28
．． During system parallel operation when the power generator No. 29 is in operation and there is voltage on the line No. 26.27, the circuit breakers 24-a and 25-a for which the synchronization verification device is not set will not perform re-closing. Generally, the condition is not met, and if the time continues to pass, the rudder C24-b.

There may also be a case where condition 25-b is not satisfied and subsequent recovery operations must be performed manually. In order to prevent this, the control center operator uses the console of the remote monitoring and control device TC installed in the control center to control the circuit breaker 2
8-a, trip 2g-3, REC' 24-b
, 25-b is reclosed, and the circuit breakers 24-a and 25-a are reclosed. Circuit breaker 2
8-a and 2g- are generally equipped with a synchronization verification device, so after voltage is generated on the lines 26 and 27, they wait for synchronization with the line power supply and are automatically turned on. As a result of the above, the system is in a state of grid restoration.

In such a recovery method, the judgment of the accident situation, the
-2, 25-8, trip operations, etc. will place a heavy burden on control center operators, and if the grid becomes large, the burden on operators during restoration operations will become even greater, and system restoration may be delayed. This can also lead to an increase in system accidents due to operator errors.゛Also I(, EC24-b, 2
If condition 5-b is not satisfied and the circuit cannot be reclosed,
In order to find out the cause of the failure of the conditions, it was necessary to check and make a decision on the condition of the equipment and voltage at each electrical station, which took time and sometimes delayed the overall recovery operation.

[Purpose of the invention]

The purpose of the present invention is to reduce the burden on control center operators and each electric station operator when recovering from an accident, and even when the power system becomes large, it is possible to eliminate the need to install EC at all system breakers. It is an object of the present invention to provide a power system restoration method in which a restoration operation can be performed simply by providing an RBC in a circuit breaker in a system section.

[Summary of the invention]

The present invention uses a remote monitoring and control device for remotely monitoring and controlling the power equipment of power generation and substations, a computer coupled to this, and a reclosing device installed at the power generation and substation for grid restoration.
The electronic computer and the reclosing device are connected via a remote monitoring and control device, and the reclosing device performs accident recovery that is possible with the reclosing device alone, and the computer performs system restoration operations that cannot be performed with the reclosing device alone. The present invention relates to a power system restoration method characterized in that it is possible to more reliably perform power system accident restoration by allocating tasks such that the work is carried out via a remote monitoring and control device.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
The figure is a power system diagram when the present invention is implemented. Third
FIG. 1 is a diagram showing the equipment configuration for implementing the present invention. In FIG. 3, 35 is an electronic computer installed in the control center, 35-a is a memory, 35-b is an arithmetic control unit,
35-C is an interface. 3 is a CRT display device, 4 is a print output device such as a line printer or typewriter, 51 to 5n is a transmission device on the control center side, 61 to 6n is a transmission device on the power generation/substation side, 71 to 7n
, 81 to 8n are voltage detectors and reclosing devices provided on the power generation and substation side, and 91 to 9n are objects to be measured or circuit breakers in the power generation and substation.

When an accident F occurs on the track 24 in FIG. 2, the circuit breakers 23-a, 24-a 12 are activated by a safety relay (not shown).
5-a is tripped.

The rLEC 23-b detects an accident and recloses the circuit breaker 23-a after a predetermined period of time after the re-closing condition is established. At the same time, the transmission line 36 is used to transfer accident information to the CPU 35.

The CPU 35 executes the following process based on the accident information. This will be explained below according to FIG.

The accident detection function of [Yes] uses accident information to determine which systems are subject to restoration operations.

■ Creation of recovery operation procedure (4 functions receive information on the system to be restored in step αΦ, and follow that information to
In step 35, the equipment to be operated, the operation order, and operation start conditions are created and passed to steps [phase] and [phase].

The recovery condition monitoring function of step [phase] is based on the recovery condition handed over from ■.
3. Wait for information on reclosing of 3-a. If the reclosing is successful, it is detected in step 0Φ and step [Yes] is activated.

The outlet operation processing function of step 0 checks the status of the circuit breakers 26-a, 28-, and 'l according to the operation procedure passed from step 0, and if the generator 28 is in the generating operation state, , 28-a. Similarly, check the status of the circuit breaker of 29-a and if the 290 generator is in operation,
9-a performs the interruption registration.

If a new registration is made in the above process, step @ passes the device number to be cut off to the TC operation function in step 0. Step 0 trips the circuit breaker via TC.

Step (c) detects the no-voltage state of the line 26 or 27 and starts step @ again.

In step @, the circuit breaker 24-a or 25-a is closed in the next operation procedure depending on the no-voltage condition.

Lines 26 and 27 have been restored, so circuit breaker 28-
a or 29-a is automatically inserted (depending on the operation of the synchronization verification device).

Step [phase] monitors the time from the trip operation of 28-a or 29-a to the above-mentioned system parallelization using the time management function of step (2). If the system is not parallelized within a certain period of time, an alarm will be issued to that effect.

The recovery operation is performed as described above.

In addition, when the K CPU performs device operations via the TC as described above, prepare a CFLT screen that displays the entire system for recovery operations and all the devices to be operated, as shown in Figure 5.
It is also possible to change the symbol of the equipment to be operated from now on or change the color of the display, have the operator do the same, and then perform the operation after the operator gives confirmation instructions.

In carrying out the present invention, the CPU 35 may be a single-function device using a microcomputer or a part of a central control system using a minicomputer.

〔Effect of the invention〕

As mentioned above, the reclosing of the main circuit breaker by the reclosing device,
By combining restoration operations using a computer, the operations can be performed appropriately, the restoration operations can be executed quickly, and stable operation of the power system can be achieved.

[Brief explanation of drawings]

Figure 1 is a power system configuration and equipment layout diagram according to the conventional method, Figure 2 is an equipment layout diagram when the present invention is implemented in a 2-+- power system, and Figure 3 is an equipment configuration for implementing the present invention. figure,
FIG. 4 is a flowchart for implementing the present invention;
The figure shows C1 used when checking equipment operation according to the present invention.
, 'lr' screen. 35 Computer 35-a Memory 35-b
Arithmetic control unit 35-c interface 3
CRT display device 4 Print output device such as a line printer or typewriter 51 Control center side transmission device 6n Power generation/substation side transmission device 711 Voltage detector 8n Reclosing device 11 people Patent attorney Noriyuki Chika (1 idiot) ) 2nd cause 91 Figure 4 Figure 5

Claims (1)

[Claims] Using a remote monitoring and control device for remotely monitoring and controlling power equipment at power generation and substations, a computer connected to this device, and a reclosing device installed at the power generation and substation for grid restoration, the computer and reclosing device are Connected via a remote monitoring and control device, the reclosing device performs accident recovery that is possible with the reclosing device alone, and restores the system that is not possible with the reclosing device alone.
A power system restoration method characterized in that the power system fault restoration can be more reliably performed by having the electronic calculation system perform the work via a remote monitoring and control device.