JPH08186945A - Wide-area network system for electric-power information - Google Patents

Abstract

PURPOSE: To perform the minimum required database access by judging whether the information access request from the man-machine interface device of another power-system monitor exceeds the preset upper limit value of a CPU load factor and the number of accessible events or not. CONSTITUTION: The data corresponding to the codes given from a man-machine interface device are made to access a local database by way of a route 101. When the requested data are in the database, access software receives the data, and an MMI 10 receives the data. The data flow through routes 102 and 103. When the requested data are not in the local database, the fact is sent back to the MMI 10 by the access software 132. The MMI 10 performs the access request for the database to another power-system monitor through a transmission processing means. A transmission processing means 233 of a host computer, which has received the access request through a WAN, checks the CPU load factor of the host computer 23 and rejects the request when the load factor exceeds a specified value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power information wide area network system for inputting information of a power system monitoring system and exchanging information with each other via a wide area network.

[0002]

2. Description of the Related Art FIG. 6 shows the configuration of a conventional power information wide area network system. Here, 10 indicates a man-machine interface device (hereinafter referred to as MMI),
It is operated by an operator who uses the power system monitoring device and is used to display the contents of a database described later.

The MMI 10 is connected to one or a plurality of other MMIs and a host computer by a LAN 12, and 11 is shown as a representative of the other MMIs in FIG. Three
Indicates the electric power system, and information indicating the state of the electric power system such as the measured value of the tidal current flowing through the transmission line, the primary and secondary voltage values of the transformer, and the open / closed state of the switch is transmitted via the information transmission device 3A. It

The information is received by the input processing software 131 of the host computer 13 and stored in the database 14. An example of the structure of the database 14 is shown in FIG.
Further, the access software 132 is software for accessing the data of the database 14 in response to a request from the MMI 10 or 11, and 15 is the access software 13 from the MMI 10.
2 shows the flow of requests for access to 2.

16 shows a flow in which the access software 132 requests data from the database 14 and receives the data, and 17 shows a flow in which the access software 132 gives the data to the MMI 10. Among the components described above, the elements other than the power system 3 are collectively referred to as the power system monitoring device 1. Power system monitoring device 1
Is a wide area network 4 (hereinafter referred to as WAN)
To the power system monitoring device 2 via.

The power system monitoring device 2 includes 20, 21, 22, 23, 2
It is composed of 4, 231, 232, and the structure thereof is the same as that of 10, 11, 12, 13, 14, 231, 232, respectively, and description thereof is omitted because it can be easily analogized. Also, 5 is the above 3
5A indicates an electric power system within a range managed by the electric power system monitoring device 2, and 5A indicates an information transmission device.

With the configuration described above, for example, MMI
Consider accessing the database from 10. In this case, the data exists in a database (hereinafter, referred to as a local database) in the first system monitoring control system in which the MMI is installed, and a database of another power system monitoring system (hereinafter, referred to as a remote database).
There are two types of cases, and the data flow will be described for both cases.

"When the data requested to be accessed is in the local database" 15: Request display of data A from the man-machine interface device 10. 16… Access software 132 is a local database
Search for 14. 17 ... Display data A.

"When the requested data is not in the local database" 15 ... Display request of data B from MMI10. 16… Access software 132 is a local database
Search for 14. 17 ... Notify MMI 10 that there is no data B, 28 ... Request data B to access software 232 of power system monitoring device 2 via WAN. 26. Search the database 24 of the power system monitoring device 2. 29 ... Send data B via WAN.

[0010]

When an accident occurs in the equipment or transmission line of the substation that constitutes the electric power system, the protective relays and switches operate, and a large amount of information is transmitted from the electric power systems 3 and 5. It is sent to the surveillance system. And MMI10,
At 11, 20, 21 many people will be operating to see the information, but at about the same time. In FIG. 6, two MMIs are connected to the LAN, but there may be a configuration of several tens of units. Also, two power system monitoring devices are connected to the WAN, but this may also be ten or more.

When a large number of MMIs simultaneously access the database as described above, the number of processings exceeds the capacity of the host computer, and even the minimum necessary data cannot be accessed. The present invention has been made in order to solve the above-mentioned problems, and it is necessary to distinguish access to a local database from access to a remote database, and to provide a means for prioritizing the former to limit the number of accesses as a whole. The purpose of the present invention is to provide a power information wide area network system that enables minimum database access.

[0012]

A power information wide area network system according to [Claim 1] of the present invention is a man-machine interface device, a host computer, an information transmission device for transmitting information of a power system, and the power. In a power information wide area network system in which a plurality of power system monitoring devices having access software for accessing system information are mutually connected via a network, a man-machine interface device of another power system monitoring device passes through a transmission processing means. Means for receiving an access request to the information of the electric power system that has been transmitted, and means for determining whether or not the received access request exceeds the set upper limit value of the CPU load factor and the accessible number. It was

In the electric power information wide area network system according to [Claim 2] of the present invention, in [Claim 1], the received access request exceeds the upper limit value of the CPU load factor and the number of accessible cases. In this case, a means for putting an access request from another power system monitoring device in a standby state is provided.

In the power information wide area network system according to [Claim 3] of the present invention, in [Claim 2], a predetermined priority is provided to an access request from another power system monitoring device and a standby state is set. The means to do was provided.

In the electric power information wide area network system according to [Claim 4] of the present invention, in [Claim 1], the access request is transmitted from the access software of another power system monitoring device via the transmission means. And

[0016]

In the electric power information wide area network system according to [Claim 1] of the present invention, the access code is first accessed by the access software in response to the retrieval code of the data designated by the MMI. If the specified data exists in the local database, the access software gives it to the MMI, and the MMI displays it. On the other hand, if the corresponding data does not exist, the MMI receives a notification to that effect and requests the other power system monitoring system to perform a search via the transmission processing means. The transmission processing means monitors the number of database accesses and the CPU load factor of its own host computer, and when the number exceeds a predetermined value, it limits access requests.

In the power information wide area network system according to [Claim 2] and [Claim 3] of the present invention, whether or not the received access request exceeds the upper limit value of the CPU load factor and the accessible number of cases. If it is determined that the access request is exceeded, an access request from another power system monitoring device is put on standby. In particular, in [claim 3], the access request is prioritized and put on standby. . Further, in claim 4, the access request is transmitted via the access software and the transmission means.

[0018]

Embodiments will be described below with reference to the drawings. FIG.
2 is a configuration diagram of an embodiment of a power information wide area network system according to claim 1 of the present invention. In FIG. 1, the same portions and the same functional portions as those in FIG. The feature of this embodiment is that each host computer is provided with transmission processing means 133 and 233 and connected to each other.

Reference numeral 101 shows a flow in which an access request is issued from the man-machine interface 10 to the access software 132. And 102 is the access software
132 is a flow for requesting data from the database 14 and receiving data, and 103 is access software 132.
Shows the flow of the data to the man-machine interface 10.

FIG. 2 is a flow chart showing the operation.
The flowchart of FIG. 2 shows the movement of the power system monitoring devices 1 and 2 when a request for searching the database is issued from the man-machine interface device 10, for example. The steps are listed below.

Step S201: The code given from the man-machine interface device, for example, the data corresponding to the date, equipment type, etc., is accessed to the local database through the route 101 in FIG. Step S202: If the requested data is in the database, the access software receives it and the MMI receives it. In FIG. 1, data flows through routes 102 and 103.

Step S203: If the requested data does not exist in the local database, the access software 132 returns a message to that effect, and 10 returns to another power system monitoring device via the transmission processing means, and the route of 104 in FIG. To request access to the database.

Step S204: Transmission processing means 233 of the host computer which has received the access request via the WAN
Checks the CPU load factor of the host computer 23, and if it is less than or equal to a predetermined value, advances to the next step S205. If it exceeds the predetermined value, the above request is rejected. Here, for the CPU load factor, for example, the CPU execution time is measured for 60 seconds, and if the execution time is 6 seconds, the CPU load factor is calculated as 10%.

Step S205: If the number of cases waiting for access in the host computer 23 is less than a predetermined value, the process proceeds to the next step S206. If it exceeds the predetermined value, the request will be rejected. Here, the number of items waiting to be accessed means the number of items that the access software has in the spool file upon receiving an access request.

Step S206: The database 24 is accessed from the transmission processing means 233 via the access software 232 through the routes 105 and 106. Step S207: The requested data is searched, and if there is the requested data, the process proceeds to the next step S208. Step S208: Receive data from the remote database 24 for the MMI 10. At this time, the data is transmitted from the transmission processing means 233 to the route 107 to 133.

FIG. 3 shows an example of the structure of the databases 14 and 24. The information numbers in which a series of numbers are assigned to all the information, the date when the information is generated, the voltage class where the equipment is installed, and the equipment The equipment type indicating the type, the manufacturing date of the equipment, and the like are associated and stored. For database access, for example, a date is used as a search key to search for corresponding data.

According to this embodiment, the transmission processing means checks the CPU load factor of the host computer and the number of access waits of the database, and rejects the access request from the remote if either value exceeds a predetermined value. To do. As a result, the load on the host computer is restricted, so that it is possible to guarantee the minimum speed performance of the local database access.

FIG. 4 is a block diagram of an embodiment of a power information wide area network system according to [Claim 2] of the present invention. In FIG. 4, the same parts and the same functional parts as those in FIG. In the present embodiment, the transmission processing means 133,
233 is provided, and standby means 13 is provided for each transmission processing means.
It is characterized by the provision of 4,234.

The operation of this embodiment performs the following checks when a remote database access request is received,
If that condition is met, the request is placed in standby means 134, 23.
Saved to 4. That is, the CPU load factor of the host computer and the number of access waits of the database are checked, and if any of the values exceeds a predetermined value, the request is stored in 134 and 234. After this state is resolved, remote database access is permitted. According to the above embodiment, there is an effect that the service can be improved by being managed by the host computer which has received the fact that the request has been received.

In the above-mentioned [claim 2], as a condition for waiting, a priority is given to an access request from another power system monitoring device according to the importance of the data to be accessed, and the device is allowed to stand by. Good. Also in this embodiment, the same effect as that of the above embodiment can be obtained, and the transmission processing can be executed with the priority according to the importance of the accessed data.

FIG. 5 is a block diagram of an embodiment of a power information wide area network system according to [Claim 4] of the present invention. 5, parts that are the same as those in FIG. 6 and parts that have the same functions are denoted by the same reference numerals, and description thereof will be omitted. The difference from FIG. 1 is that the connection between the MMI 10 and the transmission processing means 133 is entirely via the access software 132.

When the MMI accesses the local database and there is no requested data, the access software transmits the access request to another power system monitoring device via the transmission processing means. The transmission processing means of another power system monitoring system receives this, checks the CPU load factor and the number of accesses, and if the conditions are not satisfied, the access is disabled. It goes without saying that the same effects as those of the above-mentioned respective embodiments can be obtained in the above-mentioned embodiments.

[0033]

As described above, according to the present invention, the transmission processing means checks the CPU load factor of the host computer and the number of access waits of the database, and if any of the values exceeds a predetermined value, , Reject remote access request. This makes it possible to limit the load on the host computer. or,
By making a distinction between remote database access and local database access, which was not possible in the past, it is possible to guarantee the minimum speed performance of local database access.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of a power information wide area network system according to claim 1 of the present invention.

FIG. 2 is a flowchart showing the processing content of FIG.

FIG. 3 is a structural diagram of a database.

FIG. 4 is a configuration diagram of an embodiment of a power information wide area network system according to [claim 2] and [claim 3] of the present invention.

FIG. 5 is a configuration diagram of an embodiment of a power information wide area network system according to [Claim 4] of the present invention.

FIG. 6 is a diagram illustrating a conventional system.

[Explanation of symbols]

 1, 2 Power system monitoring device 3, 5 Power system 3A, 5A Information transmission device 4 WAN 10, 11, 20, 21 MMI 12, 22 LAN 13, 23 Host computer 14, 24 Database 131, 231 Input processing software 132, 232 Access software 133, 233 Transmission processing means 134, 234 Standby means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Junko Yamauchi 1st Toshiba Town, Fuchu City, Tokyo Inside the Fuchu Factory, Toshiba Corp. (72) Shinobu Kusunoki 1-15-1 Kaigan, Minato-ku, Tokyo Toshiba System Development Incorporated (72) Inventor Toshiaki Saino 1-151-1 Kaigan, Minato-ku, Tokyo Toshiba System Development Co., Ltd.

Claims (4)

[Claims] 1. A man-machine interface device, a host computer, an information transmission device for transmitting power system information, and a plurality of power system monitoring devices having access software for accessing the power system information via a network. In a power information wide area network system mutually connected by means of a means for receiving an access request for power system information transmitted from a man-machine interface device of another power system monitoring device via a transmission processing means, and the reception. CPU for which the specified access request is set
A power information wide area network system comprising means for judging whether the upper limit of the load factor and the number of accessible cases are exceeded, and limiting the number of accesses from other devices based on the judgment result. 2. The C to which the received access request is set
2. The power information wide area network system according to claim 1, further comprising means for putting an access request from another power system monitoring device in a standby state when the upper limit of the PU load factor and the number of accessible cases are exceeded. . 3. The electric power information wide area network system according to claim 2, further comprising means for setting a predetermined priority for an access request from another electric power system monitoring device and putting it in a standby state. 4. The power information wide area network system according to claim 1, wherein the access request is transmitted from the access software of another power system monitoring device via the transmission means.