JPS59119410A - Constant water level controlling system - Google Patents

Abstract

PURPOSE:To reduce the influence by a disturbance such as a wind, etc. and to open and close a water gate by an appropriate frequency by determining a new water level step basing on the water level step used in the previous time. CONSTITUTION:A control reference water level, one-step water level difference, etc. are inputted from an operating console 3, and a present water level is inputted from input ports 6, 7. Also, a water level step used in the previous step is stored in a memory 2. A CPU1 derives a difference between the present water level and a control reference water level, from which a water level step is calculated. Subsequently, the CPU1 reads out the water level step of the previous time from the memory 2, and compares it with the calculated water level step. Basing on a result of this comparison, a new water level step is determined finally. Basing on this water level step, opening and closing of a water gate 10 are controlled. In this way, the influence by a disturbance such as a wind, etc. is reduced, and the water gate can be opened and closed by an appropriate frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement of a constant water level control method for maintaining the water level of a dam or the like at a predetermined value.

[Technical background of the invention]

Constant water level control refers to the current water level H1 and the control reference water level H.

Find the water level step i from the difference between
This method determines and controls the opening of the water gate in response to the Here, the current water level Hi is the current water level of the dam obtained from a sensor (float type or ultrasonic type), and the control reference water level HO is the minimum water level that allows constant water level control. (Therefore, when the water level is below the control reference water level HO, control is performed using another method).

Specifically, in the explanatory diagram of the virtual discharge amount-water level curve shown in Fig. 1, the water level is Hi, the set water level is Hs, the control reference water level is HO1, and the virtual water discharge amount is QO. If the adjustment start flow rate is Qr, then H+) Hs (water level H
i is higher than the set water level) Qo>Qf (virtual water discharge amount Q
If at least one of the two equations is satisfied, the operation of constant water level control is stopped, and if both of the above two equations are no longer satisfied, constant water level control is started. is started.

[Problems with background technology]

However, in conventional constant water level control, the water level step l was determined only from the difference between the current water level Hi, which is sampled and sent out in real time during the constant water level control operation, and the control reference water level Ho. The water level step was made to fluctuate due to minute changes in water level, such as the water surface waves caused by this.

For this reason, the water gates are frequently opened and closed, making it difficult to perform stable water level control, and furthermore, the water gate control device is subject to significant wear and tear.

[Purpose of the invention]

The present invention was developed in view of the drawbacks of the conventional constant water level control method as described above, and the purpose is to provide a constant water level control method that can reduce the influence of disturbances such as wind and open and close water gates at an appropriate frequency. [Summary of the Invention] Therefore, in the present invention, a means for storing the previously used water level step is provided, and when determining a new water level step, the previously used water level step in the above-mentioned storing means is provided. Compare the calculated water level step with the water level step calculated this time,
The water level step was determined based on the results.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 2 is a block diagram of a system that performs constant water level control. In the same figure, 1 indicates the CPU, and 2 indicates this CPU.
1 indicates the memory used. 3 indicates an operation console, and 4 indicates a printer. Further, 5 indicates an input/output port, and 6.7.8 indicates an input port. Each of the above components is connected by a bus 9. Generally, in a control system for a dam, etc., in addition to the above-mentioned components, a schematic display panel, an input/output typewriter, etc. are connected to the bus 9, but since they are not directly related to the present invention, they will be omitted here. .

Furthermore, a signal for controlling the water gate 1o is sent from the input/output boat 5, and data on the opening degree of the water gate 1o is provided.

A water level data signal is given to the input port door from the float type water level sensor 11, a water level data signal is given to the input port door from the ultrasonic water level sensor 12, and a flow rate data signal is given to the input port 8 from the ultrasonic flow rate sensor 13. A measurement data signal is given.

The memory 2 of such a system stores a program corresponding to the operation shown in the flowchart of FIG. 3, and the CPU 1 operates in accordance with the program. This will be explained below with reference to FIGS. 6 and 4.

First of all, CPU1 is 1 data human power from the start,
Data given via the input/output port 5, input port 7.8, and data input by the operator from the console are stored in the memory 2. Specifically, the operation console 3
The set water level Hs, flood adjustment start flow iQf, control reference water level no, 1-step water level difference Δh, and constant k are input from input/output port 5, and the water gate opening is input from input port 5.
The current water level Hi is input from port 7, and the flow rate is manually input from input port 8. Therefore, CPU1 calculates Qo=k H4
The virtual water discharge amount Q is determined from the relationship. Next, the CPU 1 executes the step of determining whether to start dovetail water level control by determining whether or not at least one of the aforementioned formulas (%) holds true based on the input data and the calculation results.

Here, when at least one of the equations holds true, NO
Branches to % E ND //.

°Also, when both of the above equations do not hold, madness S−\
The process branches and the CPU 1 performs step calculation of the air and water level. Specifically, the CPU 1 calculates the current water level H1 and the control reference water level Ho.
Make a difference.

Find △Hi = Hi - Ho (Hi≧Ho). That is, i is the water level step. .

Therefore, the CPU 1 reads the previous water level step j from a predetermined area of the memory 40, and determines the final water level step according to the flowchart shown in FIG. In other words,
% i < 0 //, determine whether the water level step i is smaller than 0, and if YES, set the new water level step l to 1 and proceed to the next step; if NO, '
When i≧j+1, it is determined whether the water level step i is greater than or equal to the previous water level step J plus 1. here,
If YES, set a new water level step l to j+1 and proceed to the next step; if NO, XX i≦j-2〃, is the water level step i less than or equal to the value obtained by subtracting 2 from the previous water level step j? Decide whether or not. If the answer is YES, a new water level step l is set to j-1, and if the answer is NO, a new water level step l is set to j, and the process proceeds to each method.

When the new water level step l is determined in this way, the CPU 1 proceeds to save N new step in FIG.
The determined new water level step l is stored in a predetermined area of the memory 2. That is, the stored water level step l is referred to as the previous water level step J when determining the next water level step.

Next, C, PTJl uses the new water level step l to increase the actual discharge tx! demand. That is, in the calculation of the diffused flow rate, the real number flow rate a is calculated and obtained from the CPU1ij Qz-kI (where: constant).

Next, in the "King gate opening search", the CPU 1 searches the actual discharge flow rate Hiroshi-sluice gate opening table in the memory 2, and obtains the opening data corresponding to the obtained actual discharge flow rate.Next, In gate control i, the CPU 1 sends the obtained opening degree data to the input/output boat 5 via the bus 9.

Then, the input/output boat 5 outputs a signal for controlling the opening degree of the water gate 10, and the opening degree of the river water gate 10 is opened or closed by the corresponding amount.

When this is completed, the operation according to the flowchart of FIG. 6 is performed again.

The example shown in FIG. 4 is just one embodiment, and depending on the requirements of the system, it is also possible to reduce the frequency of opening/closing control of the water gates compared to the embodiment.

〔Effect of the invention〕

As explained above, according to the present invention, the opening and closing of the water gate for constant water level control is no longer caused by disturbances such as wind, and the water gate is opened and closed at an appropriate frequency.

Therefore, stable constant water level control is possible, and wear and tear on the water gate control device is reduced.

[Brief explanation of drawings]

Fig. 1 is a diagram showing a graph of the relationship between water level and discharge amount in constant water level control, Fig. 2 is a block diagram of a system adopting the present invention, and Figs. 6 and 4 are diagrams for explaining the present invention. It is a flowchart. 1...CPU, 2...-memory, 6...operation console, 4
...Printer, 5--I/O boat, 6.7,8.
...Input port, 9...Bus, 10...Floodgate, 11
...(Float type) water level sensor, 12-...(Ultrasonic type) water level sensor, 13...(Ultrasonic type) flow rate sensor Representative Patent attorney Noriyuki Chika (and one other person) Figure 1 Figure 2 Figure 3

Claims (2)

[Claims] (1) In the constant water level control method, which determines the water level step from the difference between the current water level and the control reference water level, determines and controls the opening of the water gate in response to the water level step, and maintains the water level at a predetermined value, the water level used last time It is characterized by providing a means for storing steps, and when determining a new water level step, a comparison is made with a previously used water level step in the storing means, and the water level step is determined based on the result. Constant water level control method. (2) If the comparison result between the previously used water level step and the water level step obtained from the difference between the current water level and the control reference water level is within the specified range, the previous water level step is used as the new water level step, and the above When the predetermined range is exceeded, the water level step that is increased or decreased by one water level step from the previous water level step is set as the new water level step, and when the comparison result is negative, 1 is determined as the new water level step. A constant water level control system according to claim (1).