JPH0287948A - Remote monitoring and control equipment - Google Patents

Abstract

PURPOSE:To enable each substation to store information from other substation by providing each substation with means storing information received from an adjacent substation, reproducing, relaying and sending said information to another adjacent substation. CONSTITUTION:Substations 3-1 to 3-15 are each equipped with a processor part and a communication controller inside; ON-OFF control switches 4-1 to 4-15, with which respective substations are connected, according to a command transmitted from a computer 1 via a master station 2 and the judgment of a substation itself; and load information such as the ON-OFF state of a switch, with which each substation is connected, and the voltage and current of each measured distribution line to monitor a power distribution system always. The communication controller of each substation has the function of reproducing and relaying information received from an adjacent substation, and information from one substation is communicated to all other substations and stored therein.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a remote monitoring and control device, and particularly to an autonomous distributed remote monitoring and control device suitable for automatic operation of a power distribution system.

[Conventional technology]

Regarding conventional remote monitoring and control equipment for power distribution systems, please refer to JAT
This is stated in the 1962 edition, Latest Power Distribution Automation System Comprehensive Technical Data Collection, published by EC Japan Technology and Economic Center.

[Problem to be solved by the invention]

In the above conventional technology, a computer is installed at the central office (office), and all information on the power distribution system is input to this computer via a remote monitoring and control device.When an accident occurs on a distribution line, the computer is used to carry out accident recovery procedures. The recovery procedure is executed under sequential control from the computer.

Therefore, when the central computer stops, automatic accident recovery is impossible even if an accident occurs. Also.

Because control functions are concentrated at the business office, it has been difficult to create accident recovery procedures when an accident occurs in the boundary section managed by the business office.

A specific example will be explained using FIG. 2. Here, from distribution substations 6-1 and 6-2, distribution lines CB5-1 to CB5-
It is assumed that power is supplied to a mesh-shaped power distribution line 7 shown by a thick line through a power line 6 . Switches 4-1 are installed at important points on the distribution line.
- 4-15 are installed, and the pressurization/non-pressurization of each section of the distribution line is controlled by opening and closing them. Here, the switches indicated by O are always in a closed state, and the switches indicated by ■ are always in an open state. Switch control slave stations 3-1 to 3-15 are connected to these switches 4-1 to 4-15, respectively. The slave stations 3-1 to 3-15 are connected to the central master station 2 by communication lines 8 (usually in a multi-drop shape as shown) shown by thin lines, and the master station 2 is further connected to the computer 1. ing. The master station 2 and the slave stations 3-1 to 3-15 transmit and receive various information using a polling/selection transmission procedure suitable for a multi-drop transmission path. In other words, slave station 3
-1 to 3-15 indicate the on state of the switches 4-1 to 4-15 to which the respective slave stations are connected and the voltage of the distribution line.

Monitoring information such as current is transmitted to the master station 2, control information is received from the master station 2, and switches 4-1 to 4-1 are operated according to instructions from the computer 1.
Perform cutting control in step 4-15.

For example, if an abnormality (ground fault, etc.) occurs in the area surrounded by switches 4-7, 4-5, 4-8, switch 4
-7 is immediately opened, and the pressure between CB5-2 and switch 4-7 remains pressurized, but switch 4-8.4-11.4
The area surrounded by -9 is not pressurized. Computer 1 collects this status information via slave stations 3-1 to 3-15 and master station 2, and adds the healthy section surrounded by switches 4-8.4-11.4-9. In order to reduce the pressure, it is determined what kind of accident recovery procedure should be used to remotely control the switches 4-1 to 4-15, and the remote control is executed according to that procedure.

That is, either switch 4-9 or 4-11 is closed and switch 4-8 is opened.

However, if the computer 1 or the master station 2 is stopped due to an abnormality or inspection, the above-mentioned accident recovery function will not work even if an accident occurs on the distribution line.

The present invention was conceived in consideration of the above-mentioned problems, and its purpose is to provide a highly reliable remote monitoring and control device that can perform accident recovery processing without any hindrance when an accident occurs even if the central computer or master station is stopped. It is about providing.

[Means to solve the problem]

In order to achieve the above object, the invention according to claim 1 connects a master station and a slave station with a mesh-like transmission path, and exchanges control information from the master station and monitoring information regarding a controlled object from the slave station. In a remote monitoring and control device that performs The invention according to claim 2 is characterized in that the information from the adjacent slave stations can be stored in order to eliminate unnecessary double communication between the slave stations. The present invention is characterized in that when information having the same content as the information already received from the regenerative relay method is received from another adjacent slave station, the information received from the other slave station is not regenerated and relayed.

For the same purpose, the invention recited in claim 3 connects a central master station and a switch control slave station on the distribution line side through a mesh-like transmission path, and transmits control information from the master station and the slave station. In a remote monitoring and control device for a power distribution system that sends and receives monitoring information regarding a power distribution system, each slave station is provided with means for storing information received from an adjacent slave station, reproducing and relaying the information, and transmitting it to other adjacent slave stations. This allows all slave stations to store information from other slave stations, and also allows each slave station to determine how it will operate based on the information it has stored when an accident occurs in a distribution line section. The present invention is characterized in that each slave station has a built-in table indicating what should be done, so that when an accident occurs, the slave stations can autonomously and cooperatively carry out accident recovery operations.

[Effect]

With the above configuration, the slave station is equipped with the following two functions. One is a function that allows slave stations to mutually communicate and store information about the control target (power distribution system) that each slave station has, and the other is a function that allows slave stations to autonomously and inconsistently use that information. This function performs accident recovery processing without any trouble. By equipping the slave stations with these two functions, it is possible to automatically perform accident recovery processing without any trouble even if the central computer or master station is stopped.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, numerals 1 to 8 indicate the same or corresponding parts as in FIG. 2. The configuration of the wiring system is the same as that in FIG. 2, and a description thereof will be omitted. In addition, as in Fig. 2, there is a master station 2 connected to the central (sales office) computer 1, and a switch 4 on the distribution line.
- Switch control slave stations 3- connected to 1 to 4-15 respectively
1 to 3-15 and a communication line 8 that connects the master station and the slave stations constitute a remote monitoring and control device. However, communication lines 8 are also laid in a mesh shape along the distribution line 7 laid in a mesh shape, thereby configuring a transmission path that connects the slave stations on a one-to-one basis.

The slave stations 3-1 to 3-15 are each equipped with a processor unit and a communication control device, and each slave station operates according to commands transmitted from the computer 1 via the master station 2 and the slave stations' own judgment. Controls the on/off of the connected switches 4-1 to 4-15, and also captures information such as the on/off state of the switches to which each slave station is connected, and the voltage and current of each measured distribution line. , constantly monitoring the power distribution system. Furthermore, the communication control device of each slave station has a function of reproducing and relaying information received from adjacent slave stations.

Information from one slave station is communicated to and stored in all other slave stations. As a means for this, when each slave station detects a change in the status of the power distribution system (hereinafter referred to as status change), it transmits the status change data to the adjacent slave station via the communication line 8 to which the slave station is connected. Send.

If the received data is the same as the previously received data, the slave station that receives it will not relay the received data; if it is not the same, it will memorize the received data and then , further regenerates and relays the received data and transmits it to the adjacent slave station. In this way, the status change data from one slave station will be stored in all slave stations 3-1 to 3-15.

Next, a detailed explanation will be given with reference to FIG.
transmits the status change data to adjacent slave stations 3-B, 3-D, and 3-I. The status change data includes a code representing the source of the status change data, that is, the slave station 3-E, and the contents of the status change, but does not include the transmission destination. The slave station that receives this status change data stores the contents of the received data and then
Furthermore, the received data is regenerated and relayed as is and transmitted to the adjacent slave station. For example, the slave station 3-B regenerates, relays and transmits to the slave stations 3-A and 3-C. Similarly, slave station 3-D is slave station 3-A.
, 3-H and transmits it. Slave station 3-A is slave station 3-
The same status change data is received from slave station B and slave station 3-D, but if the received data from slave station 3-B is earlier, slave station 3-D
Since the data received from the slave station 3-B is the same as the data received from the slave station 3-B, it is not reproduced and relayed to the adjacent slave station. That is, only the data received from the slave station 3-B (the data received earlier) is reproduced and relayed.

In this way, the status change data is communicated and stored to all the slave stations along the route shown by the arrow in FIG. 3, and there is no unnecessary double communication.

A consistent number indicating the order of occurrence may be added to the status change data for each slave station, and this may be used to determine whether or not to reproduce and relay the change. Furthermore, even if there is no change in status, reliability can be further improved by having the slave station transmit current data at regular intervals or transmitting current data based on a command from the master station.

Furthermore, if a buffer memory for temporarily storing status change data is provided in the slave station, even if multiple status changes occur in a plurality of slave stations, connection loss of status change data will not occur.

The slave stations 3-1.3-15 create a table showing how to operate based on the information stored in each slave station when an accident occurs in each section of the distribution line 7. Built-in.

For example, if an accident occurs in the area surrounded by switches 4-7.4-5.4-8 in Figure 1, this information will be transmitted from slave station 3-5.3-7 as status change data. All slave stations are contacted and stored. Here, switch 4-7.4-5.4-
If an accident occurs in the area surrounded by 8, switch 4-
7 and switch 4-8 are open, and switch 4-11 is closed, which is stored in the slave station table in advance.
The slave station 3-7.3-8.3-11 autonomously executes the switching control of the switch 4-7.4-8.4-11 in this manner.

Thereby, even if the central computer 1 or the master station 2 is stopped, automatic accident recovery processing can be carried out without any problem.

The slave station table may be a built-in table, or
It may be written from the central computer 1 after being equipped.

Here, the central computer 1 and the master station 2 are used to remotely control switches for power distribution switchover in the event of a power outage or transmission/transformation accident, or to collect information on the power distribution system. It is used for the purpose of operational management of the entire power distribution system including backup etc.

In implementing the present invention, it is necessary to increase the storage capacity of the slave station compared to the conventional one, but since highly integrated memory ICs and the like are already available at low cost, there are no particular problems in implementation. do not have.

〔Effect of the invention〕

According to the present invention, there are effects as described below.

(1) Since only the slave stations can autonomously and automatically recover from an accident, there is no problem even if the central computer or master station is stopped when an accident occurs, and reliability is improved.

(2) The computer does not particularly require multiplexing, has relatively low performance, and can be made inexpensive.

(3) Since the transmission path is mesh-shaped, even if there is an abnormality in part of the communication line, data can be transmitted between slave stations without any problem.

(4) By using a regenerative relay transmission path, the ratio between slave stations is 1:1, and the transmission quality is high. do not have).

(5) Even in the event of an accident in the boundary section of the office management, by having the slave stations on both sides communicate data with each other, the accident recovery process can be carried out in a coordinated manner.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a remote monitoring and control system according to an embodiment of the present invention, FIG. 2 is a block diagram of a remote monitoring and control system according to the prior art, and FIG. 3 is an explanatory diagram of data transmission according to the present invention. 1... Computer, 2... Master station, 3-1 to 3-15...
・Slave station, 4-1 to 4-15...Switch, 5-1 to 5-
6... Distribution line CB, 6-1.6-2... Distribution substation, 7... Distribution line, 8... Communication line.

Claims (1)

[Scope of Claims] 1. In a remote monitoring and control device that connects a master station and a slave station through a mesh-like transmission path and sends and receives control information from the master station and monitoring information regarding a controlled object from the slave station. , to each slave station,
By providing a means for storing information received from adjacent slave stations, reproducing and relaying the information, and transmitting it to other adjacent slave stations, all slave stations can store information from other slave stations. A remote monitoring and control device featuring: 2. In the remote monitoring control device according to claim 1, when each slave station receives from another adjacent slave station information with the same content as the information that has already been received and reproduced and relayed from one adjacent slave station. , a remote monitoring and control device characterized in that information received from other slave stations is not regenerated and relayed. 3. Connect the central master station and the switch control slave stations on the distribution line side using a mesh-like transmission path, and send and receive control information from the master station and monitoring information regarding the power distribution system from the slave stations. In a remote monitoring and control device for a power distribution system, each slave station is provided with a means for storing received information from an adjacent slave station, reproducing and relaying it, and transmitting it to other adjacent slave stations. It allows each slave station to store information from other slave stations, and also creates a table for each slave station that shows how to operate based on the information stored in each slave station when a distribution line section fault occurs. A remote monitoring and control device that is built into a station and enables slave stations to autonomously and cooperatively carry out accident recovery operations when an accident occurs.