JP7218658B2 - Gate control program and controller - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gate control program and a control device used for controlling an intake gate provided in a water conduit leading water through an intake screen.

In a hydroelectric power plant that uses water stored in a dam for power generation by taking it into a water conduit, if the dam water level is controlled by controlling the opening of the intake gate to keep the water level of the dam constant, When the water level of the dam rises above the maintenance water level, the intake gate is raised to automatically open to the upper limit regardless of the water level of the headrace (channel water level).

The water intake gate is equipped with an intake screen that prevents dust such as tree branches and fallen leaves from entering the waterway along with the water that is led to the waterway. . Since dust adheres to the water intake screen due to the flow of water taken into the water conduit, the operator appropriately removes the dust adhering to the water intake screen.

If debris adheres to the intake screen during constant dam water level operation, the amount of water flowing into the headrace will decrease, so the water level in the dam will rise, while the water level (water surface position) in the headrace will rise. so-called free flow occurs. When a free flow occurs, the water surface position in the water conduit is positioned below the lower end position of the water intake gate, and the difference between the lower end position of the water intake gate and the water surface position in the water conduit increases.

In this way, if the debris removal work is performed in a state where there is a large difference between the lower end of the intake gate and the water surface position in the headrace, water will suddenly flow into the headrace as soon as the debris is removed. The speed at which the mouth gate is lowered may not keep up, and there is a risk that the maintenance flow of water flowing downstream from the dam to the river will be insufficient.

In the past, in order to avoid such problems, whenever free flow occurred due to dust adhering to the intake screen, workers would go to the site and manually lower the intake gate. After that, I was working on removing the dust.

As a related technology, specifically, conventionally, for example, on the downstream side of a screen that is installed at each of a plurality of water intakes provided in a water channel and that captures dust, each water intake part in which the screen is arranged is expanded. By providing a closing means that can be closed by, by continuing water intake from one or more water intakes and stopping water intake from other water intakes, a simple and inexpensive configuration can be used to continue water intake to the screen. There is a technology related to a water intake facility capable of removing adhering dust and a method of using the facility (see, for example, Patent Document 1 below).

In addition, as a related technology, specifically, conventionally, for example, only the front side and upstream side of a water intake opened perpendicular to the flow of the main river are closed, and the downstream side is opened to open the water intake. By using a pair of arms, the net bed is extended to a position where the tractive force of the main river flow can be obtained. There is a technique related to a net field for a water intake (for example, see Patent Document 2 below).

JP 2018-96088 A JP-A-2000-273844

However, in the conventional technology described above, every time a free flow occurs due to dust adhering to the water intake screen, a worker must go to the site and manually operate the water intake gate. There was a problem that the work was complicated and the burden on the worker involved in the work of removing the dust was heavy.

In addition, the conventional technology described above operates the intake gate after the worker who removes the dust adhering to the intake screen arrives at the site, so the worker removes the dust after arriving at the site. There was a problem that it took time to start the work, and the work efficiency was inferior.

In addition, the conventional technology described in Patent Document 1 described above is a technology limited to application to a water intake facility having a plurality of water intakes, and is applied to an existing water intake facility having a single water intake. The problem was that it was difficult to

In addition, although the conventional technology described in the above-mentioned Patent Document 2 can prevent dust from adhering to the water intake, once the dust adheres to the water intake screen, it is necessary to remove the dust in the same manner as described above. There is a problem that the complicated work is required and the burden of the work on the operator is heavy.

SUMMARY OF THE INVENTION The object of the present invention is to provide a gate control program and a control device that can reduce the burden on workers involved in dust removal work and improve work efficiency, in order to solve the problems of the conventional technology described above. do.

Another object of the present invention is to provide a gate control program and a control device capable of reliably managing water intake in order to solve the above-described problems of the prior art.

In order to solve the above-described problems and achieve the object, a gate control program according to the present invention provides a computer that controls a water intake gate provided in a water conduit that conducts water from a water source to a hydroelectric power generation facility. The water level of the water conduit and the opening of the intake gate are identified and identified during constant dam water level operation that automatically raises the door of the intake gate to the upper limit opening when a predetermined threshold is exceeded. Based on the water level of the water channel and the opening of the intake gate, the level of the water surface position in the water channel and the lower end position of the gate is determined, and the lower end position of the gate is determined from the water surface position in the water channel. is high, the door is lowered until the lower end position of the door becomes equal to the position of the water surface in the water conduit.

Further, in the gate control program according to the present invention, in the above invention, the determining process identifies a water surface position in the water conduit based on the identified water level of the water conduit, and Based on the opening degree of the inlet gate, referring to a storage unit that stores the opening degree of the intake gate and the lower end position of the door body in association with each other to specify the lower end position of the door body, It is characterized by judging the height between the water surface position in the water conduit and the specified lower end position of the door.

Further, in the gate control program according to the present invention, in the above invention, the specifying process specifies again the water level of the water conduit and the opening of the intake gate after the lowering process. Characterized by

Further, in the above-described invention, the gate control program according to the present invention, when the lower end position of the door body is lower than the water level of the water conduit, until the lower end position of the door body becomes equal to the position of the water surface in the water conduit. It is characterized by executing a process of raising the door.

Further, a control device according to the present invention is a control device for controlling a water intake gate provided in a water conduit that conducts water from a water source to a hydroelectric power generation facility, wherein when the water level of the water source exceeds a predetermined threshold value, the The water level of the water conduit and the opening of the water intake gate are specified during the dam water level constant operation in which the gate of the water intake gate is automatically raised to the upper limit opening, and the specified water level of the water conduit and the water intake are specified. Based on the degree of opening of the gate, the level between the water surface position in the water channel and the lower end position of the door is determined. It is characterized by comprising a control unit that lowers the door until the position becomes equal to the position of the water surface in the water conduit.

According to the gate control program and the control device according to the present invention, it is possible to reduce the burden on the worker involved in the dust removal work and improve the work efficiency.

Further, according to the gate control program and the control device according to the present invention, there is an effect that reliable water intake management can be performed.

It is an explanatory view showing composition of a gate control system. It is explanatory drawing which shows the hardware constitutions of a gate control system. FIG. 4 is an illustration showing the gate control system with dust adhering to the intake screen. 4 is a flow chart showing a processing procedure of the control device; It is explanatory drawing which shows operation|movement of a gate control system.

Exemplary embodiments of a gate control program and a control device according to the present invention will be described in detail below with reference to the accompanying drawings.

(Configuration of gate control system)
First, the configuration of a gate control system according to an embodiment of the invention will be described. FIG. 1 is an explanatory diagram showing the configuration of a gate control system. In FIG. 1, a gate control system 100 is used in hydroelectric power generation equipment that uses water from a water source such as a dam 101 to generate power.

The dam 101 is provided with a dam water gauge 102 that measures the water level of the dam 101 . The dam water level gauge 102 can be realized, for example, by a float-type channel water gauge that measures the water level based on the position of a float floating on the liquid surface. The dam water level gauge 102 is not limited to the float type, and can be realized by water level gauges (level sensors) based on various known techniques.

The dam water level gauge 102 outputs information about the water level of the dam 101 obtained by measurement to the control device 103 . The water level of the dam 101 is represented, for example, by the vertical dimension from the bottom of the dam 101 (or a predetermined reference position set near the bottom) to the water surface of the dam 101 .

A water conduit 104 is connected to the dam 101 . Water conduit 104 is connected to dam 101 via water intake 105 . A water intake 105 is provided at a boundary position between the dam 101 and the water conduit 104 . A water intake screen 106 is provided at the water intake 105 . The water intake screen 106 can be realized by a grid-shaped member that removes debris such as driftwood and fallen leaves contained in the water taken from the dam 101 to the water conduit 104 .

The conduit 104 is provided with a conduit water gauge 107 for measuring the water level of the conduit 104 . The channel water level gauge 107 can be realized, for example, by a float-type channel water level gauge 107 that detects the water level based on the position of a float floating on the liquid surface, like the dam water level gauge 102 described above. The channel water gauge 107 is not limited to the float type, and can be realized by water gauges (level sensors) based on various known techniques.

The channel water level gauge 107 outputs information about the water level of the water channel 104 obtained by measurement to the control device 103 . The water level of the water conduit 104 is represented, for example, by the vertical dimension (see arrow A) from the bottom of the water conduit 104 to the water surface in the water conduit 104 . That is, the water level of the water conduit 104 represents the position of the water surface in the water conduit 104 .

A water intake gate 108 is provided in the water conduit 104 . The water intake gate 108 includes a door 109 that is reciprocally movable (movable up and down) along the vertical direction. The door 109 reciprocates so as to traverse the water conduit 104 . The door 109 is located at the lowermost position in the vertical direction at a fully closed position where the water conduit 104 is completely closed, and is positioned at the uppermost position in the vertical direction at a fully open position where the water conduit 104 is completely opened (see arrow B). ) and move up and down.

The intake gate 108 includes a gate drive 111 including a hoist (motor) 110 . The hoist 110 is connected to the door 109 via a wire 112 . The gate driving device 111 is driven and controlled by the control device 103 to operate the hoisting machine 110 to move the door 109 up and down. Thereby, the opening degree of the water intake gate 108 can be adjusted.

The opening degree of the water intake gate 108 is defined as "0" when the door body 109 completely blocks the water conduit 104, and "100" when the door body 109 is positioned at the uppermost position. It can be expressed by the ratio of cases where The lower end position of the door 109 is 0 cm when the door 109 completely closes the water conduit 104, and is about the same as the inner diameter of the water conduit 104 when the door 109 is positioned at the uppermost position. Specifically, for example, when the inner diameter dimension of water conduit 104 is 3.0 m, the lower end position of door 109 in the uppermost state is 300 cm.

(Hardware configuration of gate control system 100)
Next, the hardware configuration of the gate control system 100 will be explained. FIG. 2 is an explanatory diagram showing the hardware configuration of the gate control system 100. As shown in FIG. As shown in FIG. 2, the hardware of the gate control system 100 is composed of a control device 103, a gate driving device 111, a channel water level gauge 107, and a dam water level gauge .

The control device 103 can be realized by a computer device including a CPU, a memory, an input/output I/F (InterFace), etc., which are not shown. The CPU drives and controls each unit included in the hydroelectric power generation facility by executing various control programs stored in the memory based on information received through the input/output I/F.

Specifically, the memory stores, for example, the gate control program according to the embodiment of the invention. In addition to the gate control program, the memory specifically stores various types of information such as information on the water level of the channel and information on the water level of the dam 101, for example. More specifically, the memory stores, for example, a data table that associates the opening degree of the water intake gate 108 with the lower end position of the door member 109 .

The input/output I/F controls input/output of information between the control device 103, the gate drive device 111, the channel water level gauge 107 and the dam water level gauge . The input/output I/F receives input of information output from the channel water level gauge 107 or the dam water level gauge 102, for example. Also, the input/output I/F outputs, for example, a control signal output from the CPU to the gate driving device 111 .

The control device 103 executes a control program stored in the memory to perform, for example, constant dam water level operation that controls the opening of the water intake gate 108 so as to keep the water level of the dam 101 constant. When the water level of the dam 101 rises above a predetermined threshold value (maintenance water level) during the dam water level constant operation, the control device 103 automatically opens the water intake gate 108 to the upper limit regardless of the water level of the water conduit 104. Raise body 109 . The automatic upper limit opening degree may be "100" corresponding to the highest position to which the door 109 can move, or may be an arbitrary value set by the administrator of the gate control system 100 or the like.

During constant dam water level operation, the water intake gate 108 is opened to the automatic upper limit opening. , water from the dam 101 is introduced into the conduit 104 . The water stored in the dam 101 is mixed with debris such as driftwood and fallen leaves. Dust mixed in the water stored in the dam 101 (see FIG. 3) is caught on the intake screen 106 and removed when the water is led to the water conduit 104 via the water intake 105 . For this reason, the water intake screen 106 gradually accumulates dust such as tree branches and fallen leaves removed from the water that is led to the water conduit 104 .

FIG. 3 is an illustration showing the gate control system 100 with debris adhering to the water intake screen 106 . As shown in FIG. 3, when the debris 301 removed from the water directed to the water conduit 104 adheres to the intake screen 106, the amount of water blocked by the debris 301 and flowing into the water conduit 104 decreases. When the amount of water flowing into the water conduit 104 decreases, the water level of the dam 101 increases, while the water level (water surface position) of the water conduit 104 decreases.

In this way, when the difference (see arrow C) between the water level of the water conduit 104 and the lower end position of the door 109 is large, and the dust 301 adhering to the water intake screen 106 is removed, it flows into the water conduit 104. The amount of water increases rapidly. The opening/closing speed of the intake gate 108, that is, the operating speed of the gate 109, is determined according to the technical standards for the dam 101 weir facility, etc., and is restricted so that it cannot be operated at a speed higher than the determined standard.

For this reason, conventionally, the speed at which the water intake gate 108 is lowered may not keep up with the rapid increase in the amount of water flowing into the water conduit 104 . In such a case, the amount of water flowing into the water conduit 104 from the dam 101 suddenly increases, so there is a risk that the maintenance flow rate of water flowing downstream from the dam 101 to the river will be insufficient.

On the other hand, if the work of removing the garbage 301 is performed after operating the water intake gate according to the water level of the water conduit 104, it takes time from the arrival of the worker to the start of the work of removing the garbage 301. and work efficiency is poor. According to the gate control system 100 of this embodiment, such problems can be avoided by performing the control described below.

(Processing procedure of the control device 103)
Next, a processing procedure of the control device 103 will be described. FIG. 4 is a flowchart showing a processing procedure of the control device 103. As shown in FIG. In the flowchart of FIG. 4, first, it is determined whether or not the dam water level constant operation is being performed (step S401). In step S401, when the dam water level constant operation is not being performed (step S401: No), the series of processes is terminated.

In step S401, when the dam water level constant operation is being performed (step S401: Yes), the water level of the water conduit 104 and the gate opening degree are specified (step S402). In step S402, the water level of the water conduit 104 is specified based on the water level information output from the water gauge 107, for example. Further, in step S402, the gate opening degree is specified based on the output history of the control signal to the gate driving device 111, for example.

Next, based on the water level of the water conduit 104 and the gate opening degree specified in step S402, it is determined whether or not the water level of the water conduit 104 is equal to or higher than the lower end position of the door 109 (step S403). In step S403, the positional relationship in the vertical direction between the water level of the water conduit 104, that is, the water surface position in the water conduit 104 and the lower end position of the door member 109 is determined.

In step S403, when the water level of the water conduit 104 is equal to or higher than the lower end position of the door 109 (step S403: Yes), the series of processing ends.

On the other hand, in step S403, if the water level of the water conduit 104 is not equal to or higher than the lower end position of the door 109, that is, if the water level of the water conduit 104 is lower than the lower end position of the door 109 (step S403: No), the gate driving device 111 is driven and controlled to lower the water intake gate 108 to the water level of the water conduit 104 (step S404). In step S<b>404 , for example, an instruction signal for lowering the gate member 109 to the water surface position in the water conduit 104 is output to the gate driving device 111 . When the input of the instruction signal is received, the gate drive device 111 drives and controls the hoisting machine 110 based on the received instruction signal, and lowers the door 109 to the water surface position in the designated water conduit 104 (Fig. 5).

Next, after performing control to lower the intake gate 108 to the water level of the water channel, the water level of the water channel 104 and the opening of the gate are specified again (step S405). In step S405, the channel water level is specified based on the channel water level information output from the channel water level gauge 107 in the same manner as in step S402. Further, in step S402, the gate opening degree is specified based on the output history of the control signal to the gate driving device 111, for example.

Then, based on the water level of the water conduit 104 and the gate opening degree acquired in step S405, the water level of the water conduit 104 (water level 104) is equal to or higher than the lower end position of the door 109 (step S406). In step S406, similarly to step S403, the positional relationship in the vertical direction between the water level of water conduit 104, that is, the water surface position in water conduit 104 and the lower end position of door 109 is determined.

In step S406, if the water level of the water conduit 104 after performing the control to lower the gate body 109 to the water surface position in the water conduit 104 in step S404 is equal to or higher than the lower end position of the gate body 109 (step S406: Yes), End a series of processes. On the other hand, in step S406, if the water level of the water conduit 104 (water surface position in the water conduit 104) after performing the control to lower the gate body 109 to the water level of the water conduit 104 in step S404 is equal to or higher than the lower end position of the gate body 109 No, that is, when the water level of the water conduit 104 is still lower than the lower end position of the door 109 even after the control for lowering the door 109 (step S406: No), an alarm is output (step S407), and proceeds to step S404.

In step S407, for example, even though the door 109 is once controlled to be lowered to the water level of the water conduit 104, there is a gap between the water level of the water conduit 104 and the lower end position of the door 109. An alarm indicating this is output via an output device connected to the control device 103 . The output device may be implemented by a display that allows visual confirmation of the alarm output, or may be implemented by a speaker or buzzer that allows the auditory confirmation of the alarm output. Also, the output device may be realized by both a display and a speaker.

In the processing procedure described above, when the water level of the water conduit 104 is equal to or higher than the lower end position of the door 109 in step S403: Yes, the series of processing is terminated, but the present invention is not limited to this. Step S403: If the water level of the water conduit 104 is equal to or higher than the lower end position of the door 109, is the water level of the water conduit 104 higher than the lower end of the door 109 in the vertical direction? You can decide whether or not In this case, if the water level of the water conduit 104 coincides with the lower end position of the door 109, the series of processes is terminated. The door 109 may be raised according to the water level of the water channel 104 .

With such control, the opening of the water intake gate 108 can be made to follow the fluctuation (increase or decrease) of the water level of the water conduit 104. Rapid fluctuations in the amount of water flowing in can be suppressed, and a shortage of the maintenance flow rate from the dam 101 can be avoided, so that reliable water intake management can be performed.

(Operation of gate control system 100)
Next, operation of the gate control system 100 will be described. FIG. 5 is an explanatory diagram showing the operation of the gate control system 100. As shown in FIG. FIG. 5 shows the gate control system 100 in a state where the water level of the water conduit 104 coincides with the lower end position of the door 109 .

As shown in FIG. 5, when the water level of the water conduit 104 coincides with the lower end position of the door 109 (see arrow D), when the dust 301 adhering to the intake screen 106 is removed, the water conduit 104 water will not rush into the Thus, before removing the dust 301 adhering to the water intake screen 106, by matching the lower end position of the door 109 with the water level of the water conduit 104, the speed of lowering the water intake gate 108 cannot catch up, and the dam It is possible to avoid the shortage of the maintenance flow rate of water flowing from 101 to the downstream river. Such control can be widely applied to existing water intake facilities having one water intake 105 without modifying the existing facilities.

As described above, the gate control program according to the embodiment of the present invention allows the computer that controls the water intake gate 108 provided in the water conduit 104 that conducts water from the water source to the hydroelectric power generation facility to control the water level of the dam 101. The water level of the water conduit 104 and the opening of the intake gate 108 are specified and specified during the dam water level constant operation that raises the door 109 of the intake gate 108 to the automatic upper limit opening when the threshold of is exceeded. Based on the water level of the water conduit 104 and the opening of the water intake gate 108, the level between the water surface position in the water conduit 104 and the lower end position of the gate 109 is determined, and the lower end position of the gate 109 is determined from the water surface position in the water conduit 104. is high, the door 109 is lowered until the position of the lower end of the door 109 becomes equal to the position of the water surface in the water conduit 104 .

According to the gate control program of the embodiment according to the present invention, when free flow occurs during dam water level constant operation, the lower end position is aligned with the position of the water surface in the water conduit 104 without intervention by the operator. , the door 109 can be lowered. Further, the lowering of the door 109 can be started before the worker who removes the dust 301 to eliminate the free flow arrives at the site.

This eliminates the troublesome work of manually operating the water intake gate 108 by the worker, and shortens the time from the arrival of the worker to the start of the removal work of the dust 301. In addition, if the lowering of the door 109 is completed before the worker who eliminates the free flow arrives at the site, the worker can start removing the dust 301 immediately after arriving at the site.

Thus, according to the gate control program of the embodiment according to the present invention, it is possible to reduce the burden on the worker involved in the work of removing the dust 301 and improve the work efficiency.

Further, according to the gate control program of the embodiment according to the present invention, by making the opening of the water intake gate 108 follow the fluctuation (increase or decrease) of the water level of the water conduit 104, during the dam water level constant operation, garbage 301 Abrupt fluctuations in the amount of water flowing into the water conduit 104 due to the removal of can be suppressed. As a result, it is possible to avoid a shortage of the maintenance flow rate of water flowing downstream from the dam 101 to the river, and to perform reliable water intake management.

Further, in the gate control program according to the embodiment of the present invention, the determining process specifies the position of the water surface in the water conduit 104 based on the specified water level of the water conduit 104, and the specified intake gate 108 Based on the opening degree of the water intake gate 108 and the lower end position of the door 109, the storage unit that associates and stores the lower end position of the door 109 is identified, and the identified water conduit 104 It is characterized in that the height between the water surface position and the specified lower end position of the door 109 is determined.

According to the gate control program of the embodiment according to the present invention, it is possible to accurately determine whether or not free flow occurs. Thereby, the worker can appropriately determine the necessity of the removal work of the dust 301 without performing complicated work.

Further, the gate control program of the embodiment according to the present invention is characterized in that the specifying process specifies again the water level of the water conduit 104 and the opening of the water intake gate 108 after the lowering process. .

According to the gate control program of the embodiment according to the present invention, the door 109 can be lowered until the position of the lower end of the door 109 becomes equal to the position of the water surface in the water conduit 104 . This eliminates the troublesome work of manually operating the water intake gate 108 by the worker, and reduces the burden on the worker involved in the work of removing the dust 301 and improves work efficiency.

Further, the gate control program according to the embodiment of the present invention, when the lower end position of the door body 109 is lower than the water level of the water conduit 104, keeps the door closed until the lower end position of the door body 109 becomes equal to the position of the water surface in the water conduit 104. It is characterized by raising the body 109 and executing processing.

According to the gate control program of the embodiment according to the present invention, the degree of opening of the water intake gate 108 can be made to follow the fluctuation (increase/decrease) of the water level of the water conduit 104 . As a result, it is possible to suppress sudden fluctuations in the amount of water flowing into the water conduit 104 due to the removal of the debris 301 during the dam water level constant operation, avoiding the shortage of the maintenance flow from the dam 101, and ensuring Water intake can be managed.

The gate control method described in this embodiment can be realized by executing a prepared program on a computer such as a personal computer or a work station. The gate control program is recorded on a computer-readable recording medium such as a hard disk, CD (Compact Disc)-ROM, MO (Magneto-Optical disk), DVD (Digital Versatile Disk), USB (Universal Serial Bus) memory, It is executed by being read from a recording medium by a computer. Also, the gate control program may be distributed via a network such as the Internet.

INDUSTRIAL APPLICABILITY As described above, the gate control program and the control device according to the present invention are useful as a gate control program and a control device used for controlling the water intake gate provided in the water conduit that conducts water through the water intake screen. It is suitable for gate control programs and controllers used to control intake gates that perform constant dam water level operation.

100 gate control system 101 dam 102 dam water level gauge 103 control device 104 water conduit 105 water intake 106 water intake screen 107 channel water level gauge 108 water intake gate 109 gate body 110 hoisting machine 111 gate drive device 301 dust

Claims (5)

In the computer that controls the water intake gate installed in the water conduit that conducts water from the water source to the hydroelectric power generation facility,
During the dam water level constant operation for automatically raising the door body of the water intake gate to the upper limit opening when the water level of the water source exceeds a predetermined threshold,
identifying the water level of the water conduit and the opening of the intake gate;
Based on the identified water level of the water conduit and the opening of the water intake gate, determining the height between the water surface position in the water conduit and the lower end position of the door,
When the lower end position of the door body is higher than the water surface position in the water conduit, the door body is lowered until the lower end position of the door body becomes equal to the water surface position in the water conduit.
A gate control program characterized by executing processing. The process of determining
Based on the specified water level of the water channel, the position of the water surface in the water channel is specified, and based on the specified opening degree of the water intake gate, the opening degree of the intake gate and the lower end of the door. Identify the lower end position of the door by referring to a storage unit that stores the position in association with, and determine the height between the identified water surface position in the water conduit and the identified lower end position of the door.
The gate control program according to claim 1, characterized by: The process of specifying
After the lowering process, again specifying the water level of the water conduit and the opening of the intake gate;
3. The gate control program according to claim 1 or 2, characterized by: When the lower end position of the door body is lower than the water level of the water conduit, the door body is raised until the lower end position of the door body becomes equal to the water surface position in the water conduit.
4. The gate control program according to any one of claims 1 to 3, which causes a process to be executed. A control device for controlling a water intake gate provided in a water conduit that conducts water from a water source to a hydroelectric power generation facility,
During the dam water level constant operation for automatically raising the door body of the water intake gate to the upper limit opening when the water level of the water source exceeds a predetermined threshold,
identifying the water level of the water conduit and the opening of the intake gate;
Based on the identified water level of the water conduit and the opening of the water intake gate, determining the height between the water surface position in the water conduit and the lower end position of the door,
When the lower end position of the door body is higher than the water surface position in the water conduit, the door body is lowered until the lower end position of the door body becomes equal to the water surface position in the water conduit.
A control device comprising a control section.

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