JPH09172737A - Power system recovery method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power system recovery method which can automatically narrow down recovery objective patterns high in optimality. SOLUTION: This method is one which decides the recovery objective pattern to indicate the connection constitution of a new system suitable for evaluation standard for minimization of power stoppage, etc., by grasping the condition after accident of the objective system, using the facility information prepared in advance and the operation information obtained by measurement or monitoring. At this time, a plurality of evaluation standards for deciding the connection constitution of the new system are graded according to the priority, and the recovery objective patterns obtained, based on the grading are evaluated quantitatively, and they are narrowed down to a specified number or less of or a specified value or more of recovery objective patterns, according to the evaluation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the operation of a power system, and more particularly to a power system restoration method suitable for emergency restoration in the event of a power failure due to an accident, avoidance of a power failure associated with work, and the like.

[0002]

2. Description of the Related Art Prior to the description of the prior art, the power system shown in FIG.
This will be described with reference to FIG.

FIG. 2 shows an example of the configuration of an electric power system. In the drawing, the electric power system includes bus lines 510 to 570 of an electric substation such as a substation and a transmission line (including a transformer). ) 610 to 670, 710 to 730, and switches and the like that can connect or disconnect the power transmission line and the busbar.

If the power transmission line 630 is disconnected due to an accident, the loads (L1, L) on the buses 530, 540, and 550 that have been supplied with power via the power transmission line 630.
2 and L3) will be out of power, so normally open switch 8
13, the switch 843, etc. are closed, and emergency power supply restoration by the power transmission line 710, the power transmission line 720, or the power transmission line 730 is performed. Even in this emergency power supply, there are restrictions due to equipment capacity (for example, there is an upper limit to the current carrying capacity of the transmission line on the power supply path) and restrictions due to operational standards (for example, each bus bar is energized in multiple paths). It is necessary to obtain the target system configuration (recovery target pattern) and the procedure for its realization before actual operation because conditions such as not (keeping the radial system in emergency) are taken into consideration. .

In addition to the above restrictions as conditions, there are also evaluation criteria for determining the quality of restoration (target pattern), such that it is desirable that the number of operating procedures is small.

FIG. 3 shows the configuration of a system for performing emergency power restoration by a computer. In the same figure, the system extraction of the power supply restoration target is performed from the facility information 100 obtained in advance such as the connectable busbars of each transmission line and the current carrying capacity, and the operation information 150 such as the on / off state of the switch after the accident and the load amount. To do.
As a result, a recovery plan (recovery target pattern) is created in step 200, and the recovery plan is stored in the storage device in step 250. Based on this, the operating procedure is further created in step 300, and the operating procedure is stored in the storage device 35.
0, and the operation is executed according to this operation procedure.

In the example of FIG. 2, R11 (transmission line 710), R21 (transmission line 720) and R22 are applied to loads L1, L2 and L3 to be restored.
There are three possible recovery routes for (transmission line 730),
Here, restoration route R11 is R1, restoration routes R21 and R22 are R
Since the recovery route is uniquely determined if the power source is set to 2 and the power source is determined, the recovery target pattern can be organized as shown in FIG. 4 by focusing on the power source supplied to each load. FIG.
(2) shows a concrete pattern of the recovery plan.
(1) shows the process of power supply allocation to each load. FIG.
(A) to (e) in (1) show the correspondence with the pattern of the recovery plan of FIG. 4 (2) (this correspondence is shown in FIG. 6).
From FIG. 8 as well). In addition, load L in Fig. 4 (1)
The reason that the allocation of 1 and the allocation of load L2 are connected by two vertical lines is that the former assumes the latter on the supply route.

In addition to the restoration target patterns in which the loads L1, L2, and L3 are all powered by R2, there are other restoration target patterns that are supplied from the load L3 to the load L2 in addition to (c) and (c ') of FIG. There is, however, the roundabout route will be omitted here. Considering that the power supply margin of the supply path and the suppression of the number of switch operations are considered in addition to eliminating power outages as evaluation criteria, the recovery target pattern (b) and recovery target pattern (e) are considered to be optimal (or close to optimal). To be

FIG. 6 shows the result of applying the conventional method shown in the flow of FIG. 5 to the configuration example of the power system of FIG. The basic part (block B) of the algorithm of FIG. 5 is put into practical use as a heuristic solution method.
This is the method described in Japanese Patent No. 3 publication. The heuristic solution is a method based on a kind of empirical rule. For example, the evaluation criteria are to ensure a power supply margin (for example, to maximize the minimum power supply margin) and to suppress the number of switch operation times (the number of operation times) in addition to minimizing power outages , The recovery target pattern is created by sequentially selecting the recovery paths that match the evaluation criteria.

In the example of FIG. 2, since there are three restoration paths R11, R21, R22, there are three branches (selection branches) at the beginning as shown by the decision tree shown in FIG. Focusing on the power supply, the route is represented by R1 and R2). Furthermore, it is possible to select from each branch destination by the branch below. Generally, the securing of the energization margin and the suppression of the number of times of operating the switch are not compatible with each other as the evaluation standard. Therefore, in order to cooperate with each other, priorities are set in the conventional method.

FIG. 6 (1) shows the case of prioritizing the energization allowance. In order to secure the energization margin, it suffices to take a route different from the route that has already been taken (selection such as the bold line in the decision tree,
Sequentially applied). Here, for example, if the load L2 is supplied by the power supply R1 and then the load L1 is supplied by the power supply R2, the remaining load L1
In 3 there is no difference between the power supply R1 and the power supply R2 in terms of current carrying capacity, and the power supply R1 is selected and the pattern (e) is obtained from the viewpoint of operability of another evaluation criterion. Similarly, load L3
When supplied by R2, the pattern (b) can be obtained (possibly two are (b) and (e), but only one is actually obtained).

On the other hand, FIG. 6 (2) shows a case where priority is given to suppressing the number of times the switch is operated. In this case, on the contrary, the same route as the already taken route may be selected and the route being created may be extended, so that one of the recovery target patterns (a) and (c) is obtained (two It's possible, but you really only get one).

[0013]

As described above, according to the conventional method of setting the priority order, only one solution (recovery target pattern) is obtained for each set of settings, and the relationship between the sets of settings is related to each other. Is difficult to figure out about. Even if the operator sets various priority orders and seeks the recovery target pattern, it will take time and the recovery target pattern will be biased for each setting, and it may be difficult to achieve mutual cooperation. It is not always possible to obtain a desired recovery target pattern that is well balanced and has a desired optimality.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a restoration method of a power system capable of automatically narrowing down a restoration target pattern having high optimality and high quality. It is a thing.

[0015]

A method for restoring a power system according to the present invention uses a facility information that has been facilitated in advance and operational information obtained by measurement or monitoring to grasp the state of the target system after an accident and to perform a power failure. In the restoration method of the power system that determines the restoration target pattern that indicates the connection configuration of the new grid suitable for the evaluation criteria such as minimization, etc., prioritize over multiple evaluation criteria for determining the connection configuration of the new grid. It is characterized in that the recovery target patterns obtained by weighting according to the weighting are quantitatively evaluated, and the recovery target patterns less than a predetermined number or more than a predetermined evaluation value are narrowed down according to the evaluation.

Further, in the power system restoration method of the present invention, when it is determined that the evaluation index deteriorates in the subsequent creation of a new restoration target pattern for the already obtained restoration target pattern, the restoration target pattern is concerned. It is characterized in that the creation process of is suspended.

Further, the power system restoration method of the present invention is characterized in that the weight of each evaluation standard that has already been set is corrected based on the satisfaction status of each evaluation standard of a plurality of obtained recovery target patterns.

By weighting a plurality of evaluation criteria, a comprehensive evaluation by them becomes possible. In this comprehensive evaluation, selection on each curved surface in the process of creating the recovery target pattern and evaluation of the obtained recovery target pattern can be performed quantitatively, so whether or not the process of creating a new recovery target pattern should be continued. Can judge.

Further, by feeding back the obtained evaluation of the recovery target pattern to correct the weighting, the processing including the weighting can be greatly automated.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing an embodiment of a method for restoring a power system according to the present invention. Block B3, block B4, block K, etc. are added to the conventional method as a procedure according to the present invention.

The procedure according to the present invention is the same as in the conventional example.
A description will be given using a configuration example of the power system in FIG. In block A of FIG. 1, the weighting of each evaluation criterion is set as shown in the upper part of FIG. 7 by a box (in this case, the weight is a penalty). Focusing on the power supply that can be supplied to each load, a decision tree similar to that in FIG. 4 is obtained. A search (allocation of power supply to each load) according to the weighting of the setting is performed based on the selection indicated by the thick line, and the recovery target pattern (b),
(E) is obtained (block B in FIG. 1).

Here, when the load L1 is supplied from the power supply R1, the load L2 must be supplied from the power supply R1. Therefore, the penalty for supplying the load L2 from the power supply R1 (left of the vertical double line) 1) then powers load L1
An energization margin penalty (2 on the left of the first left branch) is imposed when supplying with R1, but the cumulative penalty (3) for both choices is displayed together.

When the load L1 is supplied by the power source R1, the same route R1 is connected to the loads L2, L in terms of securing the energization margin of the supply route.
The penalty is 2 because it is used once and twice in succession. In terms of controlling the number of switch operations, the penalty is 1 because the transmission line 710 (route R11) is only turned on (the switch operation is actually performed for each switch, but here it is turned on / off). Both are evaluated in a unit of a transmission line (here, the transmission line 640 can be turned on even after an accident). As a result, the load L
The total penalty is 3 when the power is supplied from 1 to the route R1.

Further, the penalty for supplying the load L3 is that the power supply R1 has an energization margin of 4, the number of operations is 0, and the power supply R2.
Then, the energization margin is 0, the number of operations is 2, and it is determined that the power supply from the power supply R2 is advantageous, and the recovery target pattern (b) is obtained (the overall penalty is 5).

Next, when the load L1 is supplied by the power supply R2, the load L2 is selected as the power supply R1 and the load L3 is also selected as the power supply R1 to obtain the recovery target pattern (e) (the overall penalty is the recovery target. Pattern (b) is also 5).

When the load L1 is the power source R2 and the load L2 (and L3) is the power source R2, it has been found that the penalty cannot be 5 or less when the load L2 is the power source R2.
The process is interrupted (block B4 in FIG. 1). Here, a threshold (value of accumulated weight (penalty, etc.)) and the number of recovery target patterns (within a designated order) are used as a criterion for determining whether or not to continue the process.

As described above, when the weighting settings for the respective evaluation criteria are set as shown in the upper part of FIG. 7, the solution (restoration target pattern) considered to be optimal can be narrowed down. It is not always done from. Therefore, the processing of the present invention described above is applied to the case where the weight setting is initially surrounded by a frame in the upper part of FIG.

Power supply to each load is allocated according to the set weighting based on the selection shown by the bold line. However, except for (d), all possible recovery target patterns have been found and candidates have been narrowed down. And it is difficult for operators to decide which one to employ. Therefore, the weighting is reset according to the procedure of FIG.

If it is determined in block K2 in FIG. 9 that the candidates have not been narrowed down, it is determined that the weight (or penalty) of some evaluation criteria is light. In the example of FIG. 8, the recovery target patterns (a) and (c) that have almost no energization margin are selected. Therefore, assuming that the weight of the energization margin is light, the value is increased. For example, if the number is doubled, the setting in FIG. 7 becomes appropriate.

As described above, the evaluation of the obtained solution (recovery target pattern) is fed back to the set weight, and the weight can be corrected to a more appropriate value.

Although the restoration of the power system in the event of an accident has been described above, it can be similarly applied to avoiding a power failure due to a work power failure. Furthermore, it goes without saying that the distribution system is also included as a power system. Further, the weight and the reference value for the recovery target pattern evaluation are not limited to the specific discrete values, but may be fuzzy ones defined by the membership function.

[0032]

According to the present invention as described above,
By weighting multiple evaluation criteria, comprehensive evaluation by them becomes possible, and this comprehensive evaluation can be applied to the selection at each stage in the process of creating the recovery target pattern and the evaluation of the recovery target pattern obtained. , It is possible to automatically narrow down the recovery target pattern with high optimality.

Further, since the recovery target pattern in the creation process or the already obtained recovery target pattern can be evaluated quantitatively, it can be judged whether or not the processing for creating a new recovery target pattern should be continued, thus improving the processing efficiency. Can be achieved.

Further, by feeding back the obtained evaluation of the recovery target pattern and correcting the weighting, it is possible to greatly automate the processing including the weighting.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an example of an embodiment of a power system restoration method according to the present invention.

FIG. 2 is a diagram showing a configuration of a power system to be restored by applying the present invention.

FIG. 3 is a diagram showing a configuration of an accident recovery system to which the present invention or a conventional method is applied.

FIG. 4 is an explanatory diagram showing a process of creating a recovery plan and a recovery target pattern that are possible in the power system of FIG.

FIG. 5 is a flowchart showing the contents of a conventional power system restoration method.

FIG. 6 is an explanatory diagram showing a process of creating a recovery target pattern obtained by applying a conventional power system recovery method.

FIG. 7 is an explanatory diagram showing a process of creating a recovery target pattern obtained by applying the present invention.

FIG. 8 is an explanatory diagram showing a method of setting weights with respect to the evaluation standard in the restoration method of the power system according to the present invention.

FIG. 9 is a flowchart showing a procedure for setting weights for evaluation criteria in the method for restoring a power system according to the present invention.

[Explanation of symbols]

 100 Storage Device for Facility Information of Target System 150 Storage Device for Operation Information of Target System 200 Recovery Target Pattern Creation Means 250 Storage Device for Recovery Target Pattern Obtained 300 Operation Procedure Creation Means 350 Storage Device for Obtained Operation Procedures 510- 570 Bus of electric station 610-670 Transmission line 710-730 Transmission line 811-872 Switch of transmission line

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadao Nagato 5-2-1 Omika-cho, Hitachi-shi, Ibaraki Hitachi Information Control System Co., Ltd. (72) Inventor Takao Nouchi 5-chome, Omika-cho, Hitachi-shi, Ibaraki No. 1 Stock company Hitachi Ltd. Omika factory

Claims (3)

[Claims] 1. A connection of a new system suitable for evaluation criteria such as power outage minimization by grasping the post-accident state of the target system by using equipment information prepared in advance and operation information obtained by measurement or monitoring. In the restoration method of the power system that determines the restoration target pattern indicating the configuration, weighting according to the priority is applied to a plurality of evaluation criteria for determining the connection configuration of the new system, and the restoration determined based on the weighting A method of restoring a power system, which quantitatively evaluates a target pattern and narrows down to a recovery target pattern of a predetermined number or less or a predetermined evaluation value or more according to the evaluation. 2. With respect to the recovery target pattern already obtained,
The restoration method of the power system according to claim 1, wherein, in the subsequent creation of a new recovery target pattern, if it is determined that the evaluation index deteriorates, the creation processing of the recovery target pattern is interrupted. 3. The weight of each evaluation standard that has already been set based on the satisfaction status of each evaluation standard of the obtained plurality of recovery target patterns is corrected. How to restore the power system.