JPH0632514B2 - Remote monitoring control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a remote monitoring control system, and more particularly to a remote monitoring control system for centrally controlling power system equipment such as a power substation using an electronic computer.

[Technical background of the invention]

FIG. 10 is a block diagram for explaining a conventional remote monitoring control system.

In FIG. 10, reference numeral 1 denotes a control desk for an operator to select and control a controlled device, a selection button 11 (which may be a CRT device) for selecting a controlled device, and a selected controlled device. The control button 12 is used to instruct "ON" / "OFF" or "UP" / "DOWN" for controlling the controlled device.

Reference numeral 2 denotes an electronic computer, which converts the selection / control information designated by the operator by the control desk 1 into a selection / control code to be sent to a remote monitoring control device (hereinafter referred to as TC), and outputs it to the TC. The computer 2 converts the selection / control code to send the selection / control information to the TC, which is an interface 21 for the control desk configured by a process input / output device for receiving the selection / control information from the control desk 1. CPU22,
Further, it is composed of a process input / output device for sending the converted selection / control code to the TC, or a TC interface 23 including a direct memory access.

Reference numeral 3 denotes a TC master station, which receives the selection / control code transmitted from the TC interface 23, performs the code check and multiple selection check, and transmits the selection / control code to the TC slave station if there is no abnormality. Have the function to

4 is a TC slave station, and the selection / transmission sent from the TC master station 3
According to the control code, it has a function of selecting a corresponding controlled device and generating a selection completion signal for informing the operator of the selection, and returning it to the master station 3. 411-4n
Reference numeral 1 denotes a drive unit that drives the controlled device (hereinafter referred to as drive unit 4i1). TC master station 3 and TC slave station 4 are T respectively
C master station 3 is a 31 to 3n station (hereinafter referred to as TC master station 3i),
The TC slave station is composed of 41: 1 to 4n stations (hereinafter referred to as TC slave stations 4i) at 1: 1 and the TC master station 3 is composed of 1 station, and the TC slave station is composed of n stations at 1: n. There are things.

Reference numeral 5 denotes a controlled device, which is usually composed of a plurality of controlled devices 51 to 5n (hereinafter referred to as 5i) per TC station.

Now, when the operator wants to select and control the controlled device 5, the controlled device 5i to be controlled this time is selected from the controlled devices from the selection button 11 of the control desk 1 and pressed. . In this case, the selection information corresponding to the controlled device is C via the controller interface 21.
It is delivered to the PU 22. Then, the CPU 22 converts the received selection information into a selection code for sending to the TC master station 3i. The converted selection code is read by the TC interface 23 and sent to the corresponding TC master station 3i. The TC master station 3i checks whether the transmitted selection code is an erroneous code or multiple selection, and if normal, transmits it to the TC slave station 4i. Based on the received selection code, the TC slave station 4i connects a control line to the controlled device 5i, and creates and returns a selection completion signal to the corresponding TC master station 3i.

When the operator confirms the selection completion signal from the TC slave station 4i, the control button 12 of the control desk 1 is then set to "ON" / "UP" or "OFF" / "OFF" according to the control content of the controlled device 5i. Press down. This operation is passed as control information from the control desk 1 to the controlled device 5 to the CPU 22 via the control desk interface 21. Then, the CPU 22 converts the received control information into a control code for sending to the TC master station 3i. The converted control code is transmitted to the TC slave station 4i in the same procedure as the control code.
Sent to. The TC slave station 4i outputs the control code transmitted to the controlled device 5i connected to the control line by the control code. As a result, the controlled device 5i
Operates according to the control direction of the output control code.
This operating state is returned to the TC master station 3i in the same procedure as the selection completion signal.

As shown in FIG. 11, the control code remains in the state of being sent out while the operator continues to press down the control button 12, and when the pressing of the control button 12 is stopped, Transmission is stopped. In short, the operator performs each operation of "ON" / "UP" or "OFF" / "DOWN" of the control button 12 while observing the state of the controlled device 5i to control ON / OFF or UP / DOWN. To do.

[Problems of background technology]

In the case of the conventional system having the above configuration, the selection / control information is read via the controller interface 21, the selection / control information is converted into a selection / control code, and the TC interface 23 is used.
If the processing of the CPU 22 that is sent to the device is congested due to some trouble, the selection / control code remains sent to the controlled device 5i.

If such a state occurs, for example, during output control of the generator or while performing voltage adjustment control, it will result in overcontrol, resulting in sway of the power system,
There is a possibility of causing a serious accident.

Note that the controlled device 5i may have a function of automatically resetting the control code when the control code is received for a certain time or longer in the device example, but this constant time is several seconds. Due to the nature of the adjustment control, continuous control cannot be performed, which is several tens of seconds, and there is a problem in that control continues for several tens of seconds and overcontrol occurs.

Further, a device for monitoring the operating state of the CPU 22 is provided, and when this monitoring device detects an abnormality of the CPU 22, TC
Some have been designed to give an instruction to lock the selection / control signal to the master station, but because a special monitoring device is required, it is expensive, and the CPU 22 is special because the monitoring device detects an abnormality of the CPU 22. However, there is a drawback in that the processing becomes complicated because it is necessary to create various diagnostic information.

[Object of the Invention]

The present invention has been made to solve the above problems, and an object of the present invention is to provide a highly reliable remote monitoring control system.

[Outline of Invention]

According to the present invention, the CPU keeps the first
While the control signal indicating the state and the control signal indicating the second state are alternately transmitted, the TC determines whether these signals are transmitted alternately, that is, whether the control signal changes for a predetermined time or longer. If it does not change for a certain period of time, the control is stopped. Therefore, when the CPU is abnormal, the control of the controlled device is stopped, which prevents overcontrol of the controlled device. can do.

Example of Invention

 Embodiments will be described below with reference to the drawings.

FIG. 1 is a circuit configuration diagram in one embodiment for explaining a remote monitoring control system according to the present invention.

In all the drawings, elements having the same function are designated by the same reference numeral.

Reference numeral 221 denotes an adjustment control function means, which has a function of sending a control signal in a pulse form or a non-control signal, and a CPU
This function is provided in the software for converting into the selection / control code by 22 and transmitting it to the TC interface 23.

Reference numerals 413 to 4n3 are control signal change detection units (hereinafter referred to as control signal change detection units 4i3), and 412 to 4n2 are timer units (hereinafter referred to as timer units 4i2). Other configurations are the same as those in FIG. The selection button 11 and the control button 12 shown in FIG. 1 correspond to the operation section of the present invention.

Figure 2 is raised expressed at a constant mark sign of ₃ C _2, lowered,
Continuation and non-control control signals, of which the up and down control signals are control signals representing the first state of the present invention, and the continuation control signals are control signals representing the second state of the present invention. ,
The non-control control signals correspond to the non-control signals that represent the third state of the present invention. It should be noted that the encoding of these control signals is not limited to 3 bits and can be encoded using a larger number of bits.

FIG. 3 is a flow chart showing the detailed operation of the adjustment control function means 221, and FIGS. 4, 5, and 6 are control signal change detecting section 4i3 and timer section 4i of TC slave station 4i, respectively.
2 is a flowchart showing the operation of the drive unit 4i1.

In the following description, it is assumed that the transmission format is selected and controlled in accordance with the transmission format based on JEM "Cyclic Digital Transmission Equipment Specification Standard", and the transmission speed is 600 baud.

That is, it is assumed that the selection / control signal is composed of a synchronization word (44 bits) and a selection / control word (44 bits), and is transmitted from the TC master station 3i to the TC slave station 4i every 0.15 seconds.

Next, the operation will be described.

Now, when the operator wants to select and control the controlled device 5, the controlled device 5i to be controlled this time is selected from the controlled devices 5 in the selection button 11 of the control desk 1 as in the case of FIG. And press the button corresponding to the corresponding device 5i.

In this case, the selection information of the controlled device 5i is passed to the CPU 22 via the controller interface 21.
Then, the CPU 22 converts the received selection information into a selection code for sending to the TC master station 3i. The selection code converted here is read by the TC interface 23 and sent to the corresponding TC master station 3i.

On the other hand, the TC master station 3i checks whether the transmitted selection code is an erroneous code or multiple selection, and if normal, transmits it to the TC slave station 4i.

The TC master station 3i continues to transmit the selection code to the TC slave station 4i until the selection cancellation request is made. Based on the received selection code, the TC slave station 4i connects a control line to the controlled device 5i and creates and returns a selection completion signal to the corresponding TC master station 3i.

The returned selection completion signal is passed from the corresponding TC master station 3i to the CPU 22 via the TC interface 23. The CPU 22 lights the selection completion indicator of the selection button 11 via the interface 21 for the control desk in order to notify the operator that the selection of the controlled device 5i selected by the selection button 11 of the control desk 1 is completed.

The operator confirms that the selection completion indicator is lit, and then the control button is pressed according to the control content of the controlled device 5i to control the controlled device 5i selected by the selection button 11. .

Next, the operation of the CPU 22 when the raising or lowering control is performed will be described with reference to FIG.

The raising operation is performed as control information from the control desk 1 to the controlled device 5 via the control desk interface 21 through the CP.
Handed over to U22. The adjustment control function means 221 discriminates the control request and sends out a raising signal (steps 101, 10).
2). After that, it is delayed by 200 msec (step 103), and then it is determined whether or not the control request is continued (step 104).

Whether or not the control request is continued is determined by, for example, whether or not the control button 12 is pushed down via the control desk interface 21.

Continuation control signal if control request continues (see Fig. 2)
Is transmitted and delayed by 200 msec. (Steps 105, 1
06). After that, it is determined again whether or not the control request is continued (step 107). If the control request is continued, the process is repeated from step 101. If the control request is not continued in step 104 or step 107, a non-control signal (see FIG. 2) is transmitted (step 108), and the process ends.

If there is a control request again until the selection is released, the above is repeated each time.

When there is a selection cancellation request, selection cancellation processing is performed, but this is not included in FIG.

Here, the delay of 200 msec. Is the TC master station 3 of 600 baud.
The selection / control signal is sent to the TC slave station 4i every i of 150 msec.
Is sent to the TC slave station 4i at least once before the delay.

When the control request is stopped, that is, when the pressing of the control button 12 is stopped, the stop operation is delivered to the CPU 22 via the control desk interface 21, and the adjustment control function 221 delays the delay of 200 msec. Step 103,
106) is stopped and a non-control signal is immediately sent by determining whether the control request is continued.
The control signal does not continue to be transmitted for 00 msec.

A timing chart of the pressed state of the control button 12 and the control operation is shown in FIG.

Next, the operation of the TC slave station 4i will be described based on FIG. 4, FIG. 5, and FIG.

FIG. 5 is a flow chart showing the operation of the timer section of the slave station, and FIG. 6 is a flow chart showing the operation of the control signal change detecting section of the slave station.

Here, as is clear from FIG. 7, since the control signal changed within 300 msec. At the maximum is sent from the TC master station 3i, the timer is set to 350 msec. Here.

When the raising control signal is sent out, the control signal change detector 4i3 detects the change in the control signal (step 30 in FIG. 4).
1), restart the timer unit 4i2, and drive unit 4i
1 to request control (steps 302, 305, 3)
06, 307).

Upon receiving the restart request, the timer unit 4i2 counts the timer (steps 401, 403, 4 in FIG. 5).
04). Here, in response to the timer restart request, the timer unit 4i2 performs the timer count of 350 msec. Again after the stop, during the counting or after the counting is completed.

The drive unit 4i1 controls according to the raising control signal (steps 501, 503, 505, 506 in FIG. 6).

Next, since the continuous control signal is sent, the control signal change detection unit 4i1 detects the change and only restarts the timer unit 4i2 (steps 301, 302, 305,
308, 309). In response to the restart request, the timer unit 4i2 stops the timer count that has progressed halfway,
The timer count of 350 msec. Is started again (steps 405, 401, 403, 404). At this time, since the drive unit 4i1 has no new request, the drive control is continued.

Hereinafter, the above is repeated until the non-control signal is transmitted, and the control is continuously performed.

When the non-control signal is sent out, the control signal change detection unit 4i3 detects the change and issues a stop request to the timer unit 4i2 and a control end request to the drive unit 4i1 (steps 301, 302, 303, 304). .

The timer unit 4i2 stops the timer count (steps 405, 401, 402).

The drive unit 4i1 stops the control (steps 501 and 50).
3, 504).

It should be noted that when a selection cancellation request comes, it goes without saying that the selection cancellation processing is performed, but this processing is performed in FIGS. 4, 5, and 6.
Not included in the figure.

Next, based on FIG. 4, FIG. 5, FIG. 6 and FIG.
The operation of selection / control cancellation when U22 is abnormal will be described below.

FIG. 8 is a timing chart of the control button depression state and control operation when the CPU is abnormal.

If an abnormality occurs in the CPU 22 during the raising control request, the raising control signal or the continuation control signal will continue to be sent (see FIG. 8). Therefore, the control signal change detector 4i
3 does not detect a change in the control signal, and therefore the timer unit 4i
2 finishes the timer count of 350 msec. And issues a control stop request to the drive unit 4i1 (steps 404, 40).
5,406). The drive unit 4i1 stops the control (steps 501 and 502). Therefore, the control of the controlled device 5 for the adjustment control can be stopped within 350 msec. After the abnormality of the CPU 22.

When the abnormality of the CPU 22 is recovered, the CPU 22 side stops pressing the control button 12 and cancels the selection, so that the CPU 22, the TC master station 3i, and the TC slave station 4i are in the non-selection control state, and the selection / control thereafter. Requests can be made consistently.

FIG. 9 is a block diagram showing a circuit configuration in another embodiment of the present invention.

In the above-described one embodiment and other embodiments, the control signal change detection unit 4i3 and the timer unit 4i2 are provided on the TC slave station 4i side, but these are provided on the TC master station 3i side and these control requests are issued. The same effect can be obtained by issuing a stop request or the like to the transmitting unit, and the transmitting unit sending a control signal or a non-control signal in response to the request.

In all the embodiments, the operating time of the timer unit 4i2 is set to 350 msec., But it goes without saying that the optimum value is selected according to the transmission speed and the like.

〔The invention's effect〕

As described above, according to the present invention, the control signal indicating the first state and the control signal indicating the second state are alternately transmitted during the control from the computer side, and the TC monitors the change in the control signal. Since it is configured to perform the control while stopping the control in the case of an abnormality, by setting the timer according to the transmission speed of the TC, etc., it is possible to quickly prevent over-control of the controlled target device, and highly reliable remote monitoring. A control method can be obtained.

Furthermore, if the TC slave station is configured to perform control while monitoring a change in the control signal, and stop the control when an abnormality occurs,
It is possible to provide highly reliable remote monitoring control capable of preventing over-control not only when a computer malfunctions but also when a transmission line malfunctions.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit configuration diagram in one embodiment for explaining a remote monitoring control system according to the present invention, and FIG. 2 is an example of a control signal represented by a ₃ C ₂ constant mark code in the present invention. FIG. 3 is a flow chart showing the operation of the control signal transmission of the computer, FIG. 4 is a flow chart showing the operation of the control signal change detection unit, FIG. 5 is a flow chart showing the operation of the timer unit, and FIG. FIG. 7 is a flow chart showing the operation, FIG. 7 is a timing chart of the control button depressing state and control operation in one embodiment of the present invention, and FIG. 8 is a control button depressing state and control operation when the CPU is abnormal in this one embodiment. 9 is a circuit configuration diagram of another embodiment of the present invention, and FIGS. 10 and 11 are explanatory diagrams of a conventional example. 1 ... Control desk, 2 ... Electronic computer, 3 ... TC master station, 4
...... TC slave station, 5 ... Controlled device, 11 ... Select button, 12 ... Control button, 21 ... Control desk interface, 2 ... CPU, 221 ... Adjustment control function, 31 to 3
n ... TC master station 3i, 311 to 3n1 ... Transmission unit 3i
1, 41-4n ... TC slave stations 4i, 411-4n1 ...
Drive unit 4i1, 412 to 4n2 ... Timer unit 4i2,
413-4n3 ... Control signal change detection units 4i3, 51-
51n ... Controlled device 5i.

Claims (1)

[Claims] 1. A remote supervisory control system for encoding / selecting a control / selection signal from an operation section using an electronic computer and selecting / controlling a controlled device via a remote supervisory controller, wherein After the selection of the controlled device is completed, when a control request for the controlled device is input from the operation unit, a control signal indicating the first state and a control indicating the second state while the control request continues. The remote monitoring control device is provided with a function of alternately generating signals and generating a non-control signal representing the third state when the control request is not continued, and encoding and transmitting the control signal and the non-control signal. It has a function to detect a change in the control signal and a timer function to operate for a certain period of time by using the change of the control signal as a trigger. But Exit control when that has been signal, when the control signal does not change more than a predetermined time to stop the control, remote monitor control system, characterized in that.