JPH02280624A - Power system accident restoration device - Google Patents

Abstract

PURPOSE:To prepare a safe and stable restoration procedure by evaluating security to each restoration operation of a prepared restoration procedure. CONSTITUTION:This device is composed of a restoration procedure preparation section 31, a simulation calculation section 32 to simulate the system condition after the restoration operation of a restoration procedure outputted from the restoration procedure preparation section 31 was performed and a security evaluation section 33 to evaluate the security against an assumed accident to the simulated system condition. The simulation calculation section 32 simulates how the system condition changes for each restoration operation of the restoration procedure to the very restoration procedure prepared by the restoration procedure preparation section 31 based on the system condition in the accident. The security evaluation section 33 evaluates the security to this simulated system condition. Unless the security can be maintained there, the restoration procedure is to be revised. A restoration procedure in which the security can always be maintained in the restoration work process can thereby be prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a power system accident recovery device that maintains security and creates a recovery procedure during the power system accident recovery process.

(Prior Art) As electric power systems become more complex and larger, once an accident occurs, operations for recovery become complicated and the time required for recovery becomes longer.

Currently, automation of recovery operations is gradually being introduced for power outage accidents in secondary and distribution systems, but for accidents in main power systems, manual restoration is performed by operators.

In this system, restoration procedures are prepared in advance for several hypothetical accidents, and when a power outage accident occurs, restoration is carried out at the operator's discretion according to these procedures.

(Problem to be Solved by the Invention) When an accident occurs in the power system and a power outage occurs, a recovery plan is created to quickly restore the power outage load while paying attention to operational safety. By the way, the most important thing to avoid in the recovery process is another power outage for the recovery load.

If an accident occurs during bad weather such as a storm, and a recovery plan is created to quickly restore the load, some systems will be subject to heavy current. In such cases, during the recovery process? I! If an accident occurs in which one line of a two-line power transmission line is stopped due to a power shock, there is a very high possibility that the restored load will experience a power outage again due to overload.

Therefore, when there is a high probability that another accident will occur, such as during bad weather, it is desirable to create a recovery procedure that can maintain security against assumed accidents.

Security is the ability of the power system to provide dynamic loads.

Maintaining or maintaining security means not causing a supply disruption in the event of a previously anticipated accident. In other words, in response to a hypothetical accident, ``equipment overload will occur'' or ``the voltage will rise (or fall) abnormally.''
It is said that security cannot be maintained or cannot be maintained when power cannot be stably supplied to the load due to ``fluctuations in the phase difference angle''.

As is clear from this, security is the ability to supply a load in a state where an accident occurs.

(This is not the load supply capacity in a state where no accident has occurred.) As described above, the present invention aims to create a safe restoration procedure that takes security into consideration to prevent another power outage due to an accident during the restoration process. The purpose of this study is to obtain information on the recovery of system failure equipment.

[Structure of the invention]

(Means for Solving the Problems) The power system accident recovery device of the present invention will be explained using FIG. 1 corresponding to an embodiment.

The present invention relates to a power system accident recovery device that receives accident information from the power system at the time of a power system accident and outputs a recovery procedure for the accident, and a recovery procedure for creating a quick and safe recovery procedure from information regarding the system status. a creation unit 31; a simulation calculation unit 32 that simulates the system state after the restoration operation of the restoration procedure output from the restoration procedure creation unit 31; and a simulation calculation unit 32 that simulates the system state simulated by the simulation calculation unit 32 and a security evaluation section 33 that evaluates security against accidents.

(Function) For the recovery procedure created by the recovery procedure creation unit 31 based on the system status at the time of the accident, the simulation calculation unit 32 simulates how the system status changes for each recovery operation in the recovery procedure. . For this simulated system situation.

The security evaluation unit 33 evaluates security.

Here, if security cannot be maintained, modify the recovery procedure. Therefore, it is possible to create a recovery procedure that can always maintain security during the recovery process.

(Example) An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of the power system accident recovery device 1M of the present invention, and the power system accident recovery device W1 (hereinafter referred to as the accident recovery device) 3 is connected to the target power system 1 from the input device i! 2, the system information is taken in, and the recovery procedure and operation details are displayed and output to an output device 4 such as a CRT display device. The accident recovery device 3 includes a recovery procedure creation section 31, a simulation calculation section (hereinafter referred to as a simulator) 32, and a security evaluation section 33.

Each part is as follows.

The recovery procedure creation unit 31 uses the post-accident grid information from the power system 1 to determine the faulty equipment, and quickly and quickly respond to the accident.
Create safe recovery procedures. Furthermore, when there is a recovery operation that causes a problem in the security evaluation as a result of the processing by the security evaluation unit 33 (when it is determined that security is not maintained), it is assumed that the recovery operation immediately before this recovery operation has been performed. is assumed to be the initial state (system state after the accident), and subsequent recovery procedures are created excluding recovery operations that caused problems in the security evaluation.

Regarding the preparation of this restoration procedure, for example,
-1527630, there are some that have applied knowledge engineering in recent years.

The simulator 32 simulates the system state after each recovery operation of the recovery procedure created by the recovery procedure creation unit 31 is executed.

For example, if there is a restoration operation to restore the load (YMW) at substation X, this restoration operation is executed and the status of each part of the power system is obtained by power flow calculation.

The security evaluation unit 33 evaluates the security of the recovery procedure simulated by the simulator 32 against hypothetical accidents. Security cannot be maintained if we consider a multiple accident in which multiple pieces of equipment become unusable at the same time, but since such accidents occur very rarely, security evaluations are based on the assumption that a single piece of equipment is damaged rather than multiple accidents. It would be time consuming and inefficient to handle a single accident resulting in unusability, or to carry out a security evaluation of all equipment in the system even for a single accident. Therefore, in this embodiment, security is evaluated using an accident predicted to be severe according to a simulated system state as a hypothetical accident. For security evaluation, voltage, overload, phase angle changes, etc. are evaluated to determine whether or not power can be supplied to the load.

Here, in order to shorten the evaluation time, it is assumed that, for example, only overload is focused on and evaluated.

Specifically, if the system status is two-line power transmission, one line interruption is assumed to be an accident. Then, the system state after this hypothetical accident is calculated using power flow calculation, and it is determined that security is maintained when no overload occurs in this system state and there is no need to cut off the load. On the other hand, when an overload occurs and it is necessary to cut off the load, it is determined that security is not maintained.

When the security evaluation unit 33 determines that security is maintained, the simulator 32 simulates the system state after executing the next recovery operation according to the recovery procedure created by the recovery procedure creation unit 31, and adjusts the system state to this system state. Perform security evaluation in the same way.

On the other hand, if the security evaluation unit 33 determines that security is not maintained, it is assumed that the recovery procedure creation unit 31 has performed a recovery operation immediately before the recovery operation that created the system state to be evaluated, The subsequent recovery procedures are created excluding recovery operations for which it is determined that security cannot be maintained.

Next, the operation of the accident recovery device 3 configured as described above is shown in the flowchart of FIG. 2. When an accident occurs in the power system, a recovery procedure is created based on the system information (ST,
1). First, for the first recovery operation in this recovery procedure, the system state after the operation is simulated (
ST, 2). Then, the security of this system state against a hypothetical accident is evaluated (ST, 3), and it is determined whether the security is maintained (ST, 4). here,
When it is determined that security is maintained, it is determined whether all security evaluations have been performed for the recovery operations in the recovery procedure, and if there is a first recovery operation, ST for the next recovery operation, The process is performed, and if there is no next recovery operation, the process ends (ST.

5). On the other hand, if it is determined in ST, 4 that security cannot be maintained, a new recovery procedure is created (ST, 6), and ST,
Perform the processing from 2 onwards.

Therefore, according to this embodiment, as explained above, it is possible to obtain a recovery procedure in which each recovery operation maintains security, so even if an accident occurs during the recovery process, it is possible to perform accident recovery with high safety without causing another power outage. can be realized. In addition, by specifying the security evaluation details, evaluation calculations can be shortened, a recovery procedure that performs security evaluation at high speed can be obtained, and recovery delays can be prevented.

Next, another embodiment will be described.

The embodiment described above describes an accident recovery device 3 that automatically performs security evaluation for all recovery operations. This is very effective during adverse weather conditions such as storms, when the probability of climate-based accidents occurring during the recovery process is high. However, in good weather, the probability of an accident occurring during the recovery process is very low, so it is not necessary to give priority to preventing recovery delays and perform security evaluations for all recovery operations.

The second embodiment will be explained using the flowchart of FIG. In the present embodiment, if it is determined in ST, 4 that security against a hypothetical accident cannot be maintained, a process (ST, 7) is provided for selecting whether or not modification of the recovery procedure is necessary. That is, for example, the output bag v14 is used to display information such as ``If one of the two lines of the A transmission line is cut off, the B transmission line will be overloaded, so a load cutoff is necessary.'' and the operator is prompted to make a selection. Here, if it is determined that there is no need to consider the occurrence of a hypothetical accident, it is selected that the recovery procedure does not need to be modified. As a result, this recovery procedure is determined to be executable and the next step ST, 5 is executed.

On the other hand, if it is determined that consideration needs to be given to the occurrence of a hypothetical accident, the necessity of modifying the recovery procedure is selected.

As a result, a recovery procedure is created in ST 6, similar to the description of the previous embodiment.

Therefore, according to this embodiment, it is possible to perform a recovery operation that maintains security against important hypothetical accidents, and therefore it is possible to create a recovery procedure safely and in a short period of time.

〔Effect of the invention〕

In the present invention, security evaluation is performed for each recovery operation in the created recovery procedure, so an accident recovery device can be created that creates a safe and stable recovery procedure that will not cause a power outage again even if an accident occurs during the recovery process. Obtainable.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of the power system accident recovery device of the present invention, Figure 2
3 and 3 are flowcharts showing the processing of the power system accident recovery device of the present invention. 2... Input device 3... Accident recovery device 4.
...Output device 31...Recovery procedure creation unit 32
...Simulation calculation department (simulator) 33 ...Security evaluation department representative Patent attorney Yudo Noriyoshi Chika Ken Daishimaru Figure 1 Figure 2

Claims (2)

[Claims] (1) A recovery procedure creation unit that inputs system information from the power system and creates a recovery procedure for the accident when an accident occurs, and simulates the system state after the recovery operation of the recovery procedure created by this recovery procedure creation unit is executed. A simulation calculation unit performs a security evaluation against a hypothetical accident in a system state simulated by this simulation calculation unit, and if security is maintained, the simulation calculation unit is made to simulate the next recovery operation, and on the other hand, if security is maintained. A power system accident recovery device comprising: a security evaluation unit that causes the recovery procedure creation unit to modify a recovery procedure excluding this recovery operation if the recovery operation is not performed. (2) The power system accident recovery device according to claim 1, further comprising a selection unit that selects whether or not to cause the recovery procedure creation unit to modify the recovery procedure when security is not maintained.