JPS63242132A - Power system failure restoring 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] [Objective of the Invention] (Industrial Application Field) The present invention provides a system for creating a power system accident recovery plan for quickly restoring power outage loads based on operational information of protective relays and circuit breakers. It is related to.

(Problems to be solved by conventional techniques and inventions) Conventionally,
The power system accident recovery system, with the exception of some systems in the lower end systems, was based on the judgment of the operator.

That is, when an accident occurs in the power system, the faulty equipment is determined based on the protection relay information and breaker information transmitted to the power dispatch center. At this time, if a malfunction or malfunction occurs in a protective relay or circuit breaker, the accident area will become wider and the number of facilities that may cause an accident will increase.

When restoring a power outage load, the following methods are used, partly because the lower voltage class at the end of the system is low. In other words, power is applied to the equipment that may be in trouble, and if the protective relay installed in that equipment operates, the equipment in question is confirmed, and if the protective relay does not operate, the power is restored to the outage equipment. This means that In this way, confirmation of the equipment involved in the accident and recovery operations are carried out as one.

On the other hand, in systems with high voltage classes, including trunk systems, overhead power transmission lines are excluded in order to avoid the effects of applying power to faulty equipment.
Do not apply electricity to any equipment that may have been involved in an accident until it is confirmed that it is not an accidental equipment. With current sensor technology, this confirmation is difficult to automate or unmanned, so manual patrols are the norm. This trend is increasing as electric plants become more centrally controlled and unmanned.

Accident recovery is first performed without using any equipment that may have been involved in the accident, and then sequentially using equipment that has been confirmed not to have been involved in the accident.

Because there are restrictions on the equipment and personnel required to carry out patrols, if accurate patrols are not carried out for equipment that may have been involved in an accident, the identification of the equipment in question will be delayed and, in turn, recovery will be significantly delayed. Also, depending on the method (order) of patrolling, equipment that is not very effective for recovery may be checked first, resulting in greater supply disruption.

Recently, a method that applies knowledge engineering has been proposed as a method for determining equipment that has an accident based on operational information of protective relays and circuit breakers, and a method has also been proposed that uses accident statistics to display the probability of equipment being involved in an accident.

However, the order of patrols for quick accident recovery has nothing to do with the probability of equipment being involved in an accident.

An object of the present invention is to provide a system for creating a recovery plan including a patrol plan for checking equipment with a possibility of an accident so that a quick recovery can be carried out.

[Structure of the invention]

(Means and actions for solving the problem) In Figure 1, 1 is the target power system, 2 is an input device that takes in system information including information on protective relays and circuit breakers, and 3 is described in detail later. 4 is an output device such as a CRT or typewriter for outputting the recovery plan 2 patrol plan.

The digital computer 3 is an arithmetic device 5 that determines the accident equipment.
, a storage device 6 that stores the results, a storage device 7 that stores the system status before and after the accident, a storage device that stores the knowledge base 1 for creating a system restoration plan, and
It consists of an arithmetic unit 9 that serves as an inference engine. In addition, the storage devices include a storage unit 81 that serves as a data base that stores data specific to the electric power system, patrol personnel, and equipment, a storage unit 82 that serves as a rule base that stores knowledge (rules) about grid restoration, and a storage unit 82 that serves as a rule base that stores knowledge (rules) about grid restoration. Knowledge (rules) about planning
It is composed of a storage section 83 that serves as a rule base based on the following.

(Example) Now, when a power outage accident occurs in the power system 1, information on the protective relay that responded to the accident, information on the breaker, and information such as the voltage and power flow of the system contents is transmitted to the digital computer 3 via the input device 2. be taken in by. protection relay information,
The breaker information is taken into the arithmetic unit 5 for determining the faulty equipment, while the information necessary for creating a recovery plan, such as the voltage and power flow of each part in the power system a1, is stored in the storage device 7.

The performance device 5 determines which equipment has caused an accident based on the information on the activated protection relays and circuit breakers.Generally, all system equipment, such as power transmission lines, transformers, and busbars, are equipped with protective relays. If all of the equipment is operating normally, it is easy to identify the equipment that caused the accident. However, if some protection relays are missing, a protection relay or breaker malfunctions or malfunctions, or even multiple accidents occur, the operating range of the protection relays and breaker becomes wider, making it difficult to determine the equipment involved. . Therefore, the arithmetic unit 5 enumerates all equipment that may have been involved in an accident.

Various such methods have been proposed.

- For example, a method of applying knowledge engineering methods to enumerate all the equipment that may be accidental equipment and adding a probability that it is an accidental equipment to each (1985 Institute of Electrical Engineers of Japan, Electric Power Technology Study Group, ``Toward Power System Control'') Knowledge Engineering Application”PE-8
5-98). This method uses a knowledge base based on operation information of circuit breakers and protection relays to determine whether or not the accident zone and accident mode 5 equipment malfunctioned. Furthermore, when multiple cases are obtained, an accident occurrence probability based on experience is added to each case.

The knowledge base is divided into four classes:

■ Operating principle of protection relay (B1) ■ Malfunction/non-operation judgment (
B2) ■ Multiple accident determination (B,) ■ Malfunction determination (B,) A schematic flow of the process is shown in FIG.

This determination result is stored in the storage device 6.

Accident equipment information stored in the storage device 6 as described later,
A recovery plan is created using information about the system status stored in the storage device 7, and the recovery plan is created for all equipment that may have an accident (referred to as accident equipment candidates).
Basically, it is created without using , so it is an accident! 12f
Create a recovery plan without using II candidates.

In other words, this recovery plan uses the storage unit 81 which is a data base, the storage unit 82 which is a rule base that stores knowledge about system restoration, and the arithmetic unit 9 which is an inference engine. A recovery plan is created by excluding all accidental equipment candidates stored in the database.

On the other hand, similarly, the memory unit 81, which serves as a data base, the memory unit 83, which serves as a rule base that stores IE knowledge for creating patrol plans, and the calculation unit 9, which serves as an inference engine, are used to analyze all accidents. Create a patrol plan for potential equipment. The knowledge to create a recovery plan is
Although it is specific to the power system, an example is “Expert System in the Electric Power Field”, Journal of the Institute of Electrical Engineers of Japan, Vol. C107, No. 2,
You can refer to February 1986. As shown in Figure 4, the knowledge base consists of meta-knowledge that groups individual knowledge related to recovery into bus lines, transmission lines, transformers, etc., and controls the grouped recovery knowledge, taking into account the efficiency of inference. has been done.

On the other hand, the storage unit 83, which serves as a rule base for creating one patrol plan, includes the following rules as an example.

■ The inspection of equipment at electrical stations is carried out by the patrol team that can arrive the earliest.

■ Equipment is required to confirm accidents with specific equipment.

■ Confirming equipment accidents requires time depending on the type of equipment.

Data such as the number of patrol teams, the equipment and number necessary for accident confirmation, and the time required for confirmation are stored in a storage unit 81 that serves as a data base.

Storage unit 8 serves as a rule base for quick recovery
3 also includes the following rules:

(g) The order of confirmation of the equipment involved in the accident shall be based on the order of increase in supply capacity when the equipment is used.

■ The amount of supply disruption caused by wasted time required for traveling for patrols, etc. will be replaced by a patrol plan in which the order of confirmation is changed.

By incorporating such knowledge, it is possible to create a patrol plan that satisfies the basic constraints of patrol while minimizing the amount of supply disruption under the previously established recovery plan.

These restoration plans 9 patrol plans are then presented to the operator via the output device 4.

The recovery flow according to this embodiment is shown in FIG.

After an accident occurs, the power dispatch center determines the faulty equipment based on the system information (21.22). Based on this result, the power dispatch center creates a recovery plan that does not use the faulty equipment candidates (21.22). 24). On the other hand, a patrol plan is created at the power dispatch center based on the accident equipment information and the recovery plan (25). Based on this, a patrol (26) is carried out, and after the accident equipment is confirmed (27), the restoration plan is revised at the power dispatch center (28), and restoration operations (29) are carried out. It is determined whether or not all failed equipment candidates have been confirmed (30). Once confirmed, the patrol ends (3I), and the restoration ends when all recoverable power outage loads have been restored.

〔Effect of the invention〕

As described above, in the present invention, the patrol plan is created at the same time as the restoration plan is created, so it is possible to perform quick restoration through efficient patrols.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart of one recovery patrol according to the embodiment. FIG. 3 is a process flowchart for determining an accidental facility using known knowledge engineering, and FIG. 4 is a process flowchart for creating a recovery plan using known knowledge engineering. 1... Power system 2... Input device 3...
Digital computer 4... Output device 5... Arithmetic device 6... Storage device 7... Storage device
8-...Storage device 81...Storage section 82
...Storage section 83...Storage section 9...Arithmetic device agent Patent attorney Nori Chika Ken Body direction Wang Hou Hongbun Figure 1 Figure 2

Claims (1)

[Claims] A power outage area determination means that determines a power outage area based on response information of protective relays installed in the power system and information of circuit breakers; Accident equipment determination means for determining equipment with a possibility of an accident, patrol plan creation means for creating a patrol plan to confirm accident equipment from among the equipment with a possibility of an accident, and equipment excluding the accident equipment. A power system accident recovery system comprising a recovery plan creation means for creating a recovery plan for a power outage load using.