JPH0733653B2 - Water flow control method for branch waterways - Google Patents

Description

TECHNICAL FIELD The present invention relates to a water amount control method for controlling a branch gate for adjusting the water amount of a branch water channel branched from a main water channel.

[Conventional technology]

As shown in FIG. 3, a plurality of branch waterways are provided for the main waterway 1.
In the channel system provided with 2 ₁ , 2 ₂ , 2 ₃ ..., each branch channel 2 ₁ , 2
The branch gates 3 ₁ , 3 ₂ , 3 ₃ ... are installed at the entrances of 2 ₂ , 2 ₃ ... to control the flow rate.

In this case, the flow rate control in each branch gate 3 ₁ , 3 ₂ , 3 ₃ ... Conventionally sets the branch water flow rate, measures the actual flow rate on the branch water channel side, and makes this measured value close to the set value. This is target value tracking control that opens and closes the gate.

[Problems to be Solved by the Invention]

In such a conventional control system, since the flow rate control is performed regardless of the amount of water in the main water channel 1, stable control can be performed only when the amount of water is relatively stable.

For example, when the amount of water in the branch channel falls below the normal level, the branch gate of the branch channel opens wide to try to secure its own flow rate, but by taking a large amount of water from the main channel 1, This will cause problems such as insufficient water volume in the branch canals. In addition, when the water volume in the canal rises above the normal level, the branch gate of that branch canal is largely closed, but by maintaining its own flow rate in this way, the water volume in the main canal 1 rises abnormally, causing obstacles such as flooding. May cause

An object of the present invention is to eliminate the disadvantages of the conventional example, and to provide a water quantity control method for a branch water channel capable of stabilizing not only the branch water channel but also the main water channel water quantity to stabilize the entire water channel system. .

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention sets a branch flow rate of a branch water channel, opens and closes a branch gate based on this branch flow rate setting value, and controls the water volume of the branch water channel in a water quantity control method, in which a main water channel is controlled. When the water amount exceeds the stable water level region, a correction coefficient that increases in proportion to the difference between the main water channel water amount and the high water level threshold value of the stable water level region is calculated, and the water amount of the main water channel is stable water level region. When it is less than, a correction coefficient that decreases in proportion to the difference between the low water level threshold value in the stable water level area and the main waterway water amount is calculated, and the correction is performed by multiplying the branch flow rate set value by the correction coefficient. However, the gist is to follow-up control the water amount in the branch water channel based on the corrected branch flow rate set value.

[Action]

According to the present invention, the flow rate set value at the branch gate of the branch waterway is corrected according to the main waterway level, so that in the high water level region, the flow rate of all gates is a flow rate slightly higher than the set value, The rise of water level in the canal can be mitigated. In addition, in the low water level region, the flow rate of all gates will be a value obtained by subtracting some from the set value, and it is possible to alleviate the water shortage downstream.

〔Example〕

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

Figure 1 is a schematic diagram showing a water control method of the branch water passage of the present invention, Figure 2 is a block diagram, but the branch water passage 2 ₁ taken as an example,
The same applies to other branch waterways.

In the 4 first diagram the flow rate controllers, to the other real branch flow rate Q by the flow meter 5 is provided in the branch water passage 2 ₁ side and the branch flow rate set value α by remote control, the branch in the main water passage 1 side Waterway
The water level of the main waterway 1 by the water level gauge 6 provided near 2 ₁ is also introduced.

In the flow controller 4, as shown in FIG. 2, the comparator 7 controls the main channel water level h to be a high water level area (h> h _H ), a stable water level area (h _H ≧ h ≧ h _L ), and a low water level area ( h _L > h), and based on the result, the arithmetic circuit 8 calculates the correction coefficient k using a correction arithmetic expression prepared in advance.

The correction calculation formula in each region is shown below.

(High water area) (Stable water level area) h _H ≧ h ≧ h _L k = 1 (Low water level area) However, h: Main waterway water level measured value h _H : High water level region threshold value (preset) h _L : Low water level region threshold value (preset) k _max : Correction coefficient upper limit value (preset) k _min : Correction Coefficient lower limit value (preset) The correction coefficient k calculated in this way is multiplied by the branch flow rate setting value α in the correction circuit 9 to obtain the branch flow rate correction setting value α ′, and this α ′ is used as the target setting value in the conventional case. Follow-up control is performed as follows. In the figure, 10 is the PID that issues the operation output of this tracking control.
It is an arithmetic unit.

〔The invention's effect〕

As described above, the method for controlling the amount of water in the branched water channel of the present invention is
In the water amount control method of setting the branch flow rate of the branch water channel, opening and closing the branch gate based on this, and controlling the water amount of the branch water channel to follow up, in the high water level region of the main water channel, mitigate the rise of the main water channel water level, In the low water level region, it is possible to mitigate the water shortage in the downstream canal, and as a result, to stabilize the entire canal system.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a water quantity control method for a branched water channel according to the present invention, FIG. 2 is a block diagram of a control system, and FIG. 3 is a plan view of the water channel. 1 ...... main waterway 2 _1, 2 _2, 2 ₃ ...... branch water passage 3 _1, 3 _2, 3 ₃ ...... branch gate 4 ...... flow controllers, 5 ...... flowmeter 6 ...... water gauge, 7 ...... Comparator 8 …… Calculation circuit, 9 …… Correction circuit 10 …… PID calculator

Claims (1)

[Claims] 1. A water quantity control method in which a branch flow rate of a branch water channel is set, and a branch gate is opened / closed based on the branch flow rate setting value to follow and control the water quantity of the branch water channel. If it exceeds, the correction coefficient that increases in proportion to the difference between the main waterway water quantity and the high water level threshold value of the stable water level area is calculated, and if the water quantity of the main waterway falls below the stable water level area, Calculates a correction coefficient that decreases in proportion to the difference between the low water level threshold value in the stable water level area and the main canal water volume, and corrects it by multiplying the branch flow rate set value by the correction coefficient. A method for controlling the amount of water in a branch water channel, wherein the amount of water in the branch water channel is tracked and controlled based on the branch flow rate set value.