JPH10191473A - Monitoring and control system - Google Patents

Abstract

(57) [Summary] [Problem] Human error (time setting mistake or forgetting to set) easily occurs in the setting of the internal clock of the monitoring control device,
Further, the internal clocks of the monitoring control device and the information input / output device cannot be accurately synchronized. SOLUTION: A standard time receiving / transmitting means 20 for receiving a standard time from a GPS capable of continuously obtaining an accurate standard time and transmitting the standard time to a monitoring and control device 10 or an information input / output device 40 of the system. The monitoring control device and the information input / output device are provided with an internal clock and time setting means for setting the internal clock based on the standard time from the standard time receiving / transmitting means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitoring and control system, for example, a time synchronization technique between power processors in a power system monitoring and control system having a plurality of processors for monitoring equipment to be controlled such as a substation or a power plant. It is about.

[0002]

2. Description of the Related Art FIG. 6 is a schematic diagram showing an example of a conventional monitoring and control system disclosed in Japanese Patent Application Laid-Open No. 8-98287. In FIG. 6, reference numeral 1 denotes a supervisory control device (master station), which incorporates a master clock device 2. Also, 4, 5, 6
... is a monitoring control device (slave station). Are connected to the supervisory control device (master station) 1 via a network medium 3.
Each has an internal clock device 7, 8, 9... The supervisory control device (master station) 1 includes internal clock devices 7, 8, 9,... Of the supervisory control devices (slave stations) 4, 5, 6,.
, Is periodically transmitted to the monitoring and control devices (slave stations) 4, 5, 6,... According to a fixed transmission procedure as time synchronization data. I do. The monitoring and control devices (slave stations) 4, 5, 6,...
The input processing of the time synchronization data is performed in accordance with a preset individual cycle calculated from each crystal precision, and the respective internal clock devices 7, 8, 9,... Are synchronized with the master clock device 2.・ Set. Also, predetermined priorities are determined for the monitoring control devices (slave stations) 4, 5, 6,..., And when a failure occurs in the monitoring control device (master station) 1, the monitoring Control device (slave station) 4, 5, 6, ...
Among them, the configuration is such that time-synchronous data can be transmitted from a high-priority and healthy monitoring control device (slave station) to another monitoring control device (slave station). Therefore, even if a failure occurs in the supervisory control device (master station) 1, another supervisory control device (slave station) is configured to be able to perform the input processing of the time synchronization data.

[0003]

However, in the above-mentioned prior art, the time (time synchronization data) of the master clock device 2 in the monitoring control device (master station) 1 is monitored by the monitoring control devices (slave stations) 4, 5. , 6...
The time of the master clock device 2 must be set to the standard time, and if the master clock device 2 has a periodic error (out of order), it must be corrected periodically. Therefore, human error (time setting mistake or forgetting to set) is likely to occur, and considering saving time information as record data,
This becomes a serious problem because the recorded data becomes meaningless.

Further, depending on the transmission timing of the time synchronous data between the supervisory control device (master station) 1 and the supervisory control devices (slave stations) 4, 5, 6,... There is a possibility that the clock device is shifted between the control devices (slave stations) 4, 5, 6,.... For example, when the monitoring and control devices (slave stations) 4, 5, 6. Accuracy is 1 (m
s), the time synchronization data has an accuracy of 1 (ms), and the transmission time of the time synchronization data on the network is 0.2 (m).
Consider the case where s) is assumed. In this case, as shown in FIG. 7, the time at a certain time is represented by an integer a (ms).
In this case, the time a at which the time synchronization data is transmitted from the monitoring control device is a + 0.8 (ms) ≦ a <a + 1.0
In the case of (1), when the data arrives at the information input / output device side, the internal clock of the monitoring control device side may have reached a + 1 (ms). For example, as shown in FIG. 7, if the time data a is transmitted at the time of a + 0.987 (ms), the time when the time data a reaches the information input / output device side is a + 1.187 (ms). is there. Therefore, while the master clock device on the monitoring control device side is a + 1 (ms), the internal clock on the information input / output device side is a (ms),
There is a possibility that a shift of 1 (ms) occurs between the respective timepiece devices. Therefore, in consideration of storing time information as recording data, it is desirable to synchronize at an accurate time, but there is a problem that such a request cannot be answered.

[0005]

According to a first aspect of the present invention, there is provided a monitoring and control system comprising: an information input / output means (information input / output device 4) for inputting / outputting information to / from a controlled facility 100;
0, 50, 60...) And monitoring control means (monitoring control devices 10 and 10A) for monitoring and controlling the equipment to be controlled via the information input / output means are arranged on a network. In a monitoring and control system, a standard time acquisition means (G
A standard time receiving / transmitting means (standard time receiving / transmitting device 20) for receiving the standard time from the PS and transmitting it to the monitoring control means and the information input / output means, wherein the monitoring control means and the information input / output means An internal clock (12, 42) and time setting means (time synchronizing unit 13, internal clock calibrating units 45 and 13A) for setting the internal clock based on the standard time from the standard time receiving / transmitting means. Have. According to a second aspect of the present invention, in the monitoring control system according to the first aspect, the standard time data transmitted from the standard time receiving / transmitting means is further transmitted to the monitoring control means on the network. A data transmission unit (network interface unit 14) is provided, and a time setting unit (internal clock correction unit 45) of the information input / output device takes into consideration a network transmission time of standard time data input via the network. The data is corrected, and based on the corrected data, its own internal clock is set accurately in synchronization with the standard time set in the internal clock of the monitoring control means. Further, in the monitoring and control system according to claim 3, the monitoring and control means and the information input / output means are each independently connected to the standard time by connecting the standard time receiving / transmitting means to the network. The standard time can be obtained from the receiving / transmitting means, and the time setting means (internal clock calibrating units 45 and 13A) of the monitoring control means and the information input / output means use the data of the standard time inputted via the network. The data is corrected in consideration of the network transmission time of
On the basis of the correction data, their own internal clocks are set accurately in synchronization with the standard time.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a monitoring control system according to a first embodiment of the present invention will be described with reference to FIGS. In each of the drawings, reference numeral 10 denotes a monitoring and control device, which performs monitoring and control of various controlled objects 100 to be monitored and controlled in the present system such as a transformer, a circuit breaker, and a switch of a substation. is there. Reference numeral 20 denotes a standard time receiving / transmitting device, which is a standard time obtaining means capable of continuously obtaining an accurate standard time, for example, a GPS.
(Global Positioning System) and sends it to the monitoring and control device 10. The GPS is a radio positioning and navigation system using military artificial satellites (24 satellites) managed and operated by the U.S. Department of Defense. Each of these satellites has an atomic clock. In this way, accurate time can be obtained continuously almost everywhere on the earth. Therefore, as long as a signal can be received from the GPS, the world standard time can be received anywhere in the world. The standard time receiving / transmitting device 20 receives the standard time from the GPS and transmits the standard time to the monitoring control device 10.
It should be noted that the standard time acquisition means can be replaced with any means that can expect a function equivalent to GPS. 40, 50,
Reference numerals 60 ... denote information input / output devices for inputting / outputting information to / from the controlled equipment 100. Are connected via the network medium 30, and information is transmitted and received between the devices.

[0007] As shown in FIG.
The information processing unit 11, the internal clock 12, and the time synchronization unit 1 which receives the standard time from the standard time receiving / transmitting device 20 and sets the internal clock 12 in synchronization with the standard time.
3 and a network interface (I / F) unit 14 for interfacing with the network medium 30 and transmitting the standard time data from the time synchronization unit 13 to the network medium 30.

The information input / output devices 40, 50, 6
Each of the 0s is configured as shown in FIG. That is, an interface with the network medium 30 is performed, and the monitoring control device 1 is connected via the network medium 30.
An interface (I / F) unit 14 for receiving standard time data transmitted from 0, an internal clock 42, an information processing unit 43, and data for inputting / outputting a monitoring operation signal to / from the controlled equipment 100. An input / output unit 44 and an internal clock calibration unit 45 that corrects the received standard time data and sets the internal clock 42 based on the corrected data are provided.

Next, the operation and operation of the monitoring and control system according to the first embodiment will be described. The standard time from the GPS is received by the standard time receiving / transmitting device 20, and the standard time is transmitted to the monitoring control device 10. The time synchronizing unit 13 of the monitoring control device 10 receives the standard time data from the standard time receiving / transmitting device 20 and sends it to the network interface unit 14, and sets the internal clock 12 based on the standard time data. (That is, internal clock 1
2 is set in synchronization with the standard time). still,
The time synchronizing unit 13 receives the standard time data from the standard time receiving / transmitting device 20 at a relatively fast cycle (for example, about one second cycle), and sets a preset cycle (for example, The data is transmitted to the internal clock 12 and the network interface unit 14 at a cycle of about 60 seconds). Further, the information processing section 11 obtains time information from the internal clock 12 set in synchronization with the standard time as appropriate,
Performs various information processing. The standard time data sent to the network interface unit 14 is output to the network medium 30 at a certain cycle (for example, every one second) and transmitted to the information input / output devices 40, 50, 60,. The data transmitted on the network is taken into the internal clock calibration unit 45 via the network interface units 41 of the information input / output devices 40, 50, 60,. Here, the internal calibration unit 45 corrects the captured standard time data from the monitoring control device 10 in consideration of the data transmission time between the monitoring control device and the information input / output device, which is stored in advance. Then, the value of the correction data is set in the internal clock 42 (that is, the internal clock is synchronously set by the correction data). For example, as described in FIG. 7, the time resolution required for the information input / output device is 1 (m
s), the time synchronization data has an accuracy of 1 (ms), and the transmission time of the time synchronization data on the network is 0.2 (m).
In the case of s), the time a when the monitoring control device transmits data
Is a + 0.8 (ms) ≦ a <a + 1.0,
Internal clocks 42 of the information input / output devices 40, 50, 60,...
Is corrected to a + 1 (ms) based on the correction data. Therefore, the internal clock 12 of the monitoring control device 10 and the internal clocks 42 of the information input / output devices 40, 50, 60,.
The accurate standard time is set in 42, 42,... And synchronization is established.

Embodiment 2 Hereinafter, based on FIGS.
A monitoring control system according to a second embodiment of the present invention will be described. In the first embodiment, the configuration in which the standard time receiving / transmitting device 20 transmits the standard time to the monitoring control device 10 has been described. However, as shown in FIG.
To connect to the network,
The transmission device 20 may be configured to transmit the data of the standard time to the network medium 30. As a configuration of the monitoring control device 10A in this case, as shown in FIG.
It has the same configuration as the information input / output device 40 of FIG. That is, an internal clock calibration unit 13A is provided instead of the time synchronization unit 13 in FIG.
4A is provided with a function similar to that of the network interface unit 41. That is, in the case of the second embodiment, the internal clock 12 of the monitoring control device 10A is set in the same manner as the internal clock 42 of the information input / output device 40 in FIG. In short, the internal clock calibration unit 13A,
45, the standard time data is corrected as described above, and based on the corrected data, the internal clocks 12 and
Are set so as to be accurately synchronized with the standard time. According to this configuration, the information input / output devices 40, 50, 60,... Transmit the standard time data not from the monitoring control device 10A (the monitoring control device 10A).
(Without going through) the standard time receiving / transmitting device 20. Therefore, even if the monitoring control device 10A fails, the information input / output devices 40, 50, 60,.
・ ・ Time synchronization becomes possible.

[0011]

According to the first aspect of the invention, since the internal clock is automatically set based on the standard time, no human error (time setting mistake or forgetting to set) does not occur. Also, regardless of the installation location of the system, a highly accurate standard time is set in the internal clock. Therefore, a highly reliable monitoring and control system capable of performing monitoring and control based on highly reliable time information can be realized.

According to the second aspect of the present invention, in addition to the effect of the first aspect, it is possible to accurately synchronize the internal clock of the monitoring control means with the internal clock of the information input / output means. That is, it is possible to prevent the set time from being shifted between the internal clocks.

Further, according to the third aspect of the invention, in addition to the effects of the first and second aspects, even when the monitoring control means fails, the internal clock of the information input / output means has a highly accurate time. Can be set.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a first embodiment of a supervisory control system according to the present invention.

FIG. 2 is a diagram illustrating a detailed configuration of a monitoring control device by the monitoring control system according to the first embodiment.

FIG. 3 is a diagram illustrating a detailed configuration of an information input / output device by the monitoring control system according to the first embodiment.

FIG. 4 is a block diagram showing a second embodiment of the monitoring control system of the present invention.

FIG. 5 is a diagram illustrating a detailed configuration of a monitoring control device by the monitoring control system according to the second embodiment.

FIG. 6 is a block diagram showing an example of a conventional monitoring control system.

FIG. 7 is a diagram for explaining time synchronization of an internal clock in a conventional monitoring and control system.

[Explanation of symbols]

10, 10A monitoring and control device, 20 standard time receiving / transmitting device, 30 network medium, 40, 50, 60
.. Information input / output device, 12, 42 internal clock, 13
Time synchronization unit (time setting unit), 14 network interface unit (data transmission unit), 45 and 13A internal clock calibration unit (time setting unit), 100 equipment to be controlled.

Claims (3)

[Claims] 1. An information input / output means for inputting / outputting information to / from a control target facility, and a monitoring control means for monitoring / controlling the control target facility via the information input / output means, on a network. In a monitoring and control system arranged, a standard time reception / transmission for receiving a standard time from a standard time obtaining means capable of continuously obtaining an accurate standard time and transmitting the standard time to the monitoring control means and the information input / output means Means, the monitoring control means and the information input / output means, an internal clock,
A time setting means for setting the internal clock based on a standard time from the standard time receiving / transmitting means. 2. The system according to claim 1, wherein the monitoring control unit further includes a data transmission unit configured to transmit standard time data transmitted from the standard time reception / transmission unit onto the network. The means corrects the data in consideration of the network transmission time of the standard time data input via the network, and, based on the corrected data, sets its own internal clock to the internal clock of the monitoring control means. 2. The monitoring and control system according to claim 1, wherein the setting is performed in exact synchronization with the set standard time. 3. A configuration in which the standard time receiving / transmitting means is connected to the network so that the monitoring control means and the information input / output means can each independently obtain the standard time from the standard time receiving / transmitting means. The monitoring control unit and the time setting unit of the information input / output unit correct the data in consideration of the network transmission time of the data of the standard time input via the network, and based on the corrected data, 2. The monitoring and control system according to claim 1, wherein an internal clock is set accurately in synchronization with the standard time.