JP4514735B2 - Dam discharge control system - Google Patents

Description

  The present invention relates to a dam discharge flow rate control system for controlling the discharge flow rate of water discharged from a valve provided in a dam discharge channel to the downstream side of the dam.

In a hydroelectric power plant, water is blocked by a dam, the stored water is taken from the dam, and the water turbine is rotated by this water, and the generator is rotated to generate power. On the other hand, the dam is separately provided with a water discharge channel for discharging water to the river downstream of the dam, and the water discharge flow rate is adjusted by opening and closing a valve provided in the water discharge channel. The discharge flow rate is adjusted so that the river flow rate can be maintained by agreement with the river area.

As a method for adjusting the discharge flow rate, for example, an adjustment method using a dam gate control device as shown in Patent Document 1 is known. This dam gate control device inputs the measured river level and the set target water level to the control unit, and based on the deviation between the river cross-sectional area stored in the memory unit and the river water level and the target water level, The gate opening required to satisfy the above is obtained.
JP-A-8-92946

  In the control device disclosed in Patent Document 1, the discharge flow rate required for setting the current river water level to the target water level is obtained, and the gate opening degree is obtained. However, the discharge flow rate is reflected in the river flow rate at the measurement point after the time until the discharge water reaches the measurement point from the gate. Therefore, in such a discharge flow control, there is a problem that, in practice, the agreed river flow rate may not be reached or excessive discharge may be performed, and appropriate discharge flow control is not performed.

  This invention is made | formed in view of this point, The place made into the objective is to control the discharge flow from a dam appropriately.

  A discharge control system for a dam according to the present invention is a dam discharge control system for controlling the discharge of water discharged from a valve provided in a dam discharge passage to the downstream of the dam, in a river downstream of the dam, A water level meter that measures a water level at a measurement point, which is a point where water discharged from the valve reaches at time t, and a discharge amount of water discharged from the valve based on the water level measured by the water level meter. A discharge flow control device, wherein the discharge flow control device calculates a determined discharge flow of water discharged from the valve, and calculates a discharge flow of water discharged from the dam by the calculation main body. A control unit that controls the determined discharge flow rate, and the calculation main body unit converts the water level measured at the measurement time T1 by the water level meter into a measurement point flow rate of the measurement point, Measurement time T1 The flow rate calculation unit that calculates the natural flow rate at the time of measurement at the measurement time point T1 of the measurement point by subtracting the flow rate before arrival time, which is the flow rate of water from the valve, at the time point T2 before time t from the measurement point flow rate. And a calculation unit for predicting a predicted natural flow rate at the measurement point at a time point T3 after time t1 from the measurement time point T1, and a determined discharge flow rate based on the predicted natural flow rate. A discharge flow rate calculation unit for calculation.

  According to said structure, the water level measured with the water level meter is converted into a measurement point flow volume by the conversion part of the calculation main-body part in a discharge flow control apparatus. Next, in the flow rate calculation unit, the natural flow rate during measurement is obtained from the measurement point flow rate. In the prediction calculation unit, the predicted natural flow rate is predicted based on the measured natural flow rate. In the discharge flow rate calculation unit, the determined discharge flow rate is calculated from the predicted natural flow rate. The control unit of the discharge flow rate control device controls the discharge flow rate so that the determined discharge flow rate water calculated by the calculation main body unit is discharged from the dam.

  In this way, the flow rate of water discharged from the dam valve is not determined based on the flow rate at the measurement point at the time of measurement, but the natural flow rate at the measurement point at time point T3 after time t1 from the measurement time point T1 is predicted. Thus, the predicted natural flow rate is determined as a reference. Therefore, since the discharge flow is determined based on the natural flow rate at the time when the discharged water is reflected as the flow rate at the measurement point, excessive discharge or discharge that does not satisfy the secured flow rate is suppressed, and the appropriate discharge flow rate is reduced. Control is performed.

  According to the present invention, the natural flow rate at the time when the discharged water is reflected as the flow rate at the measurement point is predicted, and the discharge flow rate is determined based on the predicted natural flow rate. Can be controlled.

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

  FIG. 1 shows a schematic configuration of a discharge facility to which a dam discharge flow rate control system according to an embodiment of the present invention is applied.

  Reservoir 2 is blocked by dam 1. The dam 1 is provided with a water discharge channel 3 for discharging water 6 to a river 7 downstream of the dam 1. A wall 1 a on the reservoir 2 side of the dam 1 is attached with a lower end of a water intake pipe 4 for taking the water 6 of the reservoir 2 and flowing it into the water discharge channel 3. The water intake pipe 4 is rotated by the moving part 10 along the wall part 1a about a direction perpendicular to the wall part 1a of the dam 1 as a rotation axis, and at the water intake 4a opened at the upper end of the water intake pipe 4. The depth h from the water surface of the dam 1 is adjusted.

  In the discharge channel 3, a valve 5 is opened on the side opposite to the reservoir 2 of the dam 1. By manipulating opening and closing of the valve 5 of the water discharge channel 3, the discharge flow rate R of the water 6 to the river 7 downstream of the dam 1 is adjusted. The adjustment of the discharge flow rate R is performed by controlling the opening degree of the valve 5. The valve 5 is opened and closed by a valve opening / closing part 11 provided in the water discharge channel 3, and the opening degree of the valve 5 is controlled by an opening degree control part 12 that controls the valve opening / closing part 11. In addition, when the height h from the water surface of the reservoir 2 to the intake port 4a of the intake pipe 4 is constant, the discharge flow rate R and the valve opening degree have a one-to-one correspondence relationship.

  River side water level meters 15a and 15b for measuring the water level H are installed at the measurement point A in the river 7 downstream of the dam 1 and the measurement point B downstream of the measurement point A. Measurement points A and B are points where water discharged from the dam 1 arrives at times tA and tB, respectively.

  In the upper part of FIG. 1, a discharge flow rate control device 20 for controlling the discharge flow rate R of water from the valve 5 of the dam 1 is shown. The discharge flow control device 20 includes a data input unit 21, a calculation main body unit 22, a storage unit 23, first and second memory units 24 and 27, a control unit 25, and a water intake pipe control unit 26. Yes.

  The data input unit 21 receives signals indicating the water levels HA and HB at the measurement points A and B measured by the river side water level meters 15a and 15b.

  The storage unit 23 stores data of a preset secured flow rate Qn, a reference flow rate Qs, a limited discharge flow rate Rl, and times tA and tB. The secured flow rate Qn is a flow rate determined by a river area or the like as a flow rate to be secured at the measurement point. The reference flow rate Qs is set to a flow rate larger than the secured flow rate Qn. The limit discharge flow rate Rl is an upper limit value of the discharge flow rate R of the water 6 from the valve 5.

  The calculation main body 22 calculates a determined discharge flow rate Rd of water discharged from the valve 5 based on the water levels HA and HB of the river input from the data input unit 21 and each data input from the storage unit 23. .

  The first memory unit 24 stores the determined discharge flow rate Rd calculated by the calculation main body unit 22 and outputs the determined release flow rate Rd to the calculation main body unit 22 as the discharge flow rate Rt before arrival time at each time point.

  The second memory unit 27 stores the measured natural flow rate Q2 calculated by the calculation main body unit 22 and outputs the measured natural flow rate Q2 to the calculation main body unit 22 as the natural flow rate Qt before arrival time at each time point.

  The control unit 25 converts the determined discharge flow rate Rd calculated by the calculation main body unit 22 into the opening degree of the valve 5 necessary for discharging water of the determined discharge flow rate Rd from the valve 5. Based on the opening degree of the valve 5 obtained by the control part 25, the opening degree control part 12 of the dam 1 controls the opening degree of the valve opening / closing part 11.

  The intake pipe control unit 26, based on the water level Hd of the reservoir 2 measured by the dam water level gauge 13, in order to maintain a constant depth h from the water surface of the reservoir 2 to the intake 4 a of the intake pipe 4. Determine the position of the water pipe 4. Specifically, the difference between the water level Hd of the reservoir and the height hs of the intake port 4a from the bottom surface of the reservoir 2 is the depth h. Accordingly, the intake pipe control unit 26 obtains a height hs by subtracting a preset depth h from the water level Hd, and the moving unit 10 moves the intake pipe 4 so that the intake port 4a comes to the height hs. Rotate.

  As shown in FIG. 2, the calculation main body 22 includes a conversion unit 31, a flow rate calculation unit 32, a determination unit 33, an increase / decrease amount calculation unit 34, a prediction unit 35, a discharge flow rate calculation unit 36, and a discharge flow rate determination unit 37. ing.

  The conversion unit 31 is a part that converts the water levels HA and HB input from the data input unit 21 into a measurement point flow rate Q1 that is a flow rate of the water 6 flowing through the measurement points A and B. Conversion is performed in advance based on a conversion table in which the flow rates of the measurement points A and B corresponding to the water levels HA and HB of the measurement points A and B are tabulated. The conversion table data is stored in the storage unit 23.

  The flow rate calculation unit 32 is a part that calculates the natural flow rate Q2 during measurement at the measurement point T1 at the measurement points A and B. The natural flow rate means the amount of water that naturally flows into the river 7 that does not include the water 6 in the reservoir 2 discharged from the dam 1 out of the water 6 that flows into the river 7. Here, the discharged water from the dam 1 that passes through the measurement point at the measurement time point T1 is discharged at the time point T2, which is a time point before the measurement time point T1. Therefore, by subtracting the pre-arrival time discharge flow rate Rt, which is the discharge flow rate R of the water discharged from the valve 5 at the time point T2, from the measurement point flow rate Q1 at the measurement time point T1, the measurement natural flow rate Q2 at the measurement time point T1 is obtained. .

  The pre-arrival time discharge flow rate Rt is data in which the determined discharge flow rate Rd obtained by the calculation main body unit 22 is stored in the first memory unit 24 at the time point T2. The determined discharge flow rate Rd at this time point T2 is input from the first memory unit 24 during the calculation of the flow rate calculation unit 32 at the measurement time point T1, as the pre-arrival time discharge flow rate Rt at the measurement time point T1.

  In addition, the measured natural flow rate Q2 calculated at the measurement time T1 is stored in the second memory unit 27.

  The determination unit 33 is a part that determines whether or not the measured natural flow rate Q2 calculated by the flow rate calculation unit 32 is smaller than the reference flow rate Qs stored as data in the storage unit 23. When the measurement natural flow rate Q2 is larger than the reference flow rate Qs, the calculated discharge flow rate Rn as the discharge flow rate R that needs to be discharged from the valve 5 is set to zero. The reference flow rate Qs is input from the storage unit 23 when the determination unit 33 calculates.

  The increase / decrease amount calculation unit 34 and the prediction unit 35 are prediction calculation units that predict a predicted natural flow rate Q3 at a measurement point at a time point T3 that is a time point t after the measurement time point T1.

  The increase / decrease amount calculation unit 34 is a part that calculates an increase / decrease amount d that is a natural flow rate that increases or decreases from the time point T2 to the measurement time point T1 at the measurement points A and B. The increase / decrease amount d is obtained by subtracting the natural flow rate Q2 during measurement at the measurement time point T1 from the natural flow rate Qt before arrival time which is the natural flow rate at the time point T2. The natural flow rate of the water flowing through the measurement points A and B is not constant and varies depending on the weather, temperature, time, season, and the like. Of this change in natural flow rate, an increase / decrease amount d from time T2 to measurement time T1 is obtained.

  The natural flow rate Qt before arrival time is data in which the measured natural flow rate Q2 calculated at the time point T2 is stored in the second memory unit 27. The natural flow rate Qt before arrival time is input from the second memory unit 27 when the increase / decrease amount calculation unit 34 calculates at the measurement time T1.

  Based on the increase / decrease amount d obtained by the increase / decrease amount calculation unit 34, the prediction unit 35 obtains a predicted natural flow rate Q3 as a natural flow rate predicted to flow through the measurement point at time T3. The predicted natural flow rate Q3 is an amount obtained by subtracting the increase / decrease amount d from the measurement natural flow rate Q2, and the natural flow rate from the measurement time point T1 to the time point T3 increases or decreases in the same manner as the increase or decrease of the natural flow rate from the time point T2 to the measurement time point T1. Can also be calculated as The predicted natural flow rate Q3 can also be calculated using data in which the relationship between the water levels HA and HB at the past measurement points A and B and the average value of the increase / decrease amount d is recorded. This data is stored in the storage unit 23.

  The discharge flow rate calculation unit 36 and the discharge flow rate determination unit 37 are discharge flow rate calculation units that obtain a determined discharge flow rate Rd based on the predicted natural flow rate Q3.

  The discharge flow rate calculation unit 36 calculates the discharge flow rate Rn as the discharge flow rate R that needs to be discharged because the flow rates at the measurement points A and B at the time T3 become the reserved flow rate Qn stored as data in the storage unit 23. It is a part to ask for. The calculated discharge flow rate Rn is obtained by subtracting the predicted natural flow rate Q3 at the time T1 obtained by the prediction unit 35 from the secured flow rate Qn. The secured flow rate Qn is input from the storage unit 23 at the time of calculation in the discharge flow rate calculation unit 36.

  The discharge flow rate determination unit 37 is a part for obtaining a determined discharge flow rate Rd that is a discharge flow rate R of water actually discharged from the valve 5. The limited discharge flow rate Rl set in the storage unit 23 is compared with the calculated discharge flow rate Rn obtained by the discharge flow rate calculation unit 36, and the smaller of the limited discharge flow rate Rl and the calculated discharge flow rate Rn is determined to be the determined discharge flow rate Rd. Is done.

  Next, a method for controlling the discharge flow rate R using the discharge flow control system for the dam 1 according to the present invention will be described.

(First embodiment)
First, a case where the discharge flow rate is controlled based on the water level HA only at the measurement point A will be described.

  The storage unit 23 of the discharge flow rate control device 20 stores data of a preset reserved flow rate Qn, a reference flow rate Qs, a limited discharge flow rate Rl, and a time tA.

  The water level meter 15 measures the water level HA at the measurement point A at the measurement time point T1. The water level HA is measured every hour, and the determined discharge flow rate Rd in the calculation main body 22 is also calculated every hour.

  The measured water level HA is input to the data input unit 21 in the discharge flow control device 20. The data input unit 21 outputs water level HA data to the calculation main body unit 22.

  Next, the determined discharge flow rate Rd is calculated in the calculation main body 22. FIG. 3 is a flowchart showing the calculation operation in the calculation main unit 22.

  The water level HA data is read by the conversion unit 31 (step S1).

  In the conversion part 31, it converts into the measurement point flow volume Q1 of measurement time T1 of the measurement point A from the water level HA (step S2).

  In the flow rate calculation unit 32, a measurement natural flow rate Q2 at the measurement point A at the measurement time point T1 is obtained from the measurement point flow rate Q1 at the measurement time point T1. The natural flow Q2 at the time of measurement is obtained by subtracting the discharge flow Rt before arrival time from the measurement point flow Q1 (step S3). The pre-arrival time discharge flow Rt is input from the first memory unit 24.

  In the determination part 33, it is determined whether the measurement natural flow rate Q2 is smaller than the reference flow rate Qs (step S4).

  When the measurement natural flow rate Q2 is greater than or equal to the reference flow rate Qs, the discharge flow rate calculation unit 36 sets the calculated discharge flow rate Rn to zero (step S5). Then, the discharge flow rate determination unit 37 sets the calculated discharge flow rate Rn as the determined discharge flow rate Rd (step S13). Then, the calculation ends.

  On the other hand, when the measurement natural flow rate Q2 is smaller than the reference flow rate Qs, the increase / decrease amount calculation unit 34 calculates the increase / decrease amount d. The increase / decrease amount d is obtained by subtracting the measured natural flow rate Q2 from the natural flow rate Qt before arrival time (step S6). The natural flow rate Qt before arrival time is input from the second memory unit 27.

  In the prediction unit 35, based on the increase / decrease amount d, a predicted natural flow rate Q3 at time T3 when the water discharged at the measurement time T1 reaches the measurement point A is obtained (step S7).

  In the discharge flow calculation part 36, the calculated discharge flow Rn is calculated. The calculated discharge flow rate Rn is obtained by subtracting the predicted natural flow rate Q3 from the secured flow rate Qn (step S8). The secured flow rate Qn is input from the storage unit 23.

  In the discharge flow rate determination unit 37, it is determined whether or not the calculated discharge flow rate Rn is smaller than zero (step S9).

  When the calculated discharge flow rate Rn is smaller than zero, the determined discharge flow rate Rd is set to zero (step S10). Then, the calculation ends.

  On the other hand, if the calculated discharge flow rate Rn is greater than or equal to zero, it is determined whether or not the calculated discharge flow rate Rn is smaller than the limit discharge flow rate Rl (step S11). The limited discharge flow rate Rl is input from the storage unit 23.

  When the calculated discharge flow rate Rn is larger than the limit discharge flow rate Rl, the limit discharge flow rate Rl is set as the determined discharge flow rate Rd (step S12). Then, the calculation ends.

  On the other hand, when the calculated discharge flow rate Rn is smaller than the limit discharge flow rate Rl, the calculated discharge flow rate Rn is set as the determined discharge flow rate Rd (step S13). Then, the calculation ends.

  The determined discharge flow rate Rd calculated in the calculation main body unit 22 is stored in the first memory unit 24. The measured natural flow rate Q2 at the measurement time T1 calculated in step S2 is stored in the second memory unit 27.

  The determined discharge flow rate Rd is output to the control unit 25. The control unit 25 converts the determined discharge flow rate Rd into the opening degree of the valve 5 necessary for discharging water of the determined discharge flow rate Rd from the valve 5. Based on the opening degree of the valve 5 obtained by the control part 25, the opening degree control part 12 of the dam 1 controls the opening degree of the valve opening / closing part 11.

  As described above, the natural flow rate at the measurement point A at the time point T3 after the measurement time point T1, that is, when the discharged water reaches the measurement point A is predicted, and the dam 1 is determined based on the predicted natural flow rate Q3. The determined discharge flow rate Rd of water discharged from the valve 5 is obtained. Therefore, the determined discharge flow rate Rd is obtained based on the predicted natural flow rate Q3 at the time when the discharged water is reflected as the flow rate of the measurement point A, not based on the flow rate at the measurement point A at the time of measurement. The discharge or the discharge that does not satisfy the secured flow rate Qn is suppressed, and the appropriate discharge flow rate R is controlled.

  On the other hand, as shown in FIG. 1, the position of the intake pipe 4 is controlled by the intake pipe control unit 26 of the discharge flow rate control device 20.

  Specifically, the dam water level meter 13 measures the water level Hd of the reservoir 2. The data of the measured water level Hd is input to the intake pipe control unit 26 of the discharge flow control device 20. From the moving unit 10, data on the height hs of the intake port 4 a of the intake pipe 4 from the bottom surface of the reservoir 2 is input to the intake pipe control unit 26.

  The intake pipe control unit 26 subtracts the height hs of the intake 4 a from the water level Hd of the reservoir 2 to obtain the height h from the water surface of the reservoir 2 to the intake 4 a of the intake pipe 4. The intake pipe control unit 26 controls the height hs of the intake port 4a so that the height h becomes a value set in advance in the intake pipe control unit 26, for example, h = 2000 mm. That is, the moving unit 10 rotates the intake pipe 4 along the wall 1a so that the height h becomes a predetermined value.

  If the water level Hd of the reservoir 2 decreases due to power generation and the water intake 4a is exposed at a position higher than the water surface, water intake cannot be performed. On the other hand, if the water level Hd rises due to rain or the like, and the water pipe 4 takes water away from the water surface of the reservoir 2, low-temperature water or turbid water is taken, and such water If it is released into the river, the river environment will be adversely affected. However, in the dam discharge flow rate control system of the present invention, the movement of the intake pipe 4 is controlled so that the height h from the water surface of the reservoir 2 to the intake port 4a of the intake pipe 4 is constant. Therefore, it can suppress that the water intake 4a is exposed from the water surface. Furthermore, since the height h is kept constant and the amount of water taken from the water intake pipe 4 is stabilized, the one-to-one relationship between the opening degree of the valve 5 and the discharge flow rate R is stabilized. For this reason, since the determined discharge flow rate Rd calculated by the calculation main body 22 can be discharged more reliably by the opening degree of the valve 5 obtained by the control unit 25, the discharge flow rate R is more appropriately controlled. be able to. Moreover, since the water h can be stably taken from a position close to the water surface of the reservoir 2 by setting the height h small, it is possible to suppress the intake of water having a low temperature or muddy water.

  Moreover, the calculation of the determined discharge flow rate Rd is performed by the discharge flow control system of the dam including the discharge flow control device 20, the river side water level gauges 15a and 15b, the valve opening / closing part 11, the dam water level gauge 13, the intake pipe 4, the variable part 10 and the like. Since the control of the discharge flow rate R and the control of the position of the intake pipe 4 can be managed by a unified system, the discharge facility of the dam 1 can be efficiently managed.

(Second embodiment)
Next, a case where the discharge flow rate is controlled based on the two water levels HA and HB of the measurement points A and B will be described. Detailed description of the same parts as those in the first embodiment will be omitted.

  The storage unit 23 of the discharge flow rate control device 20 stores data of preset reserved flow rates QnA and QnB, reference flow rate Qs, limit discharge flow rate Rl, lower limit reference flow rate Qs'B, and times tA and tB.

  The water levels HA and HB at the measurement points A and B at the measurement time point T1 are measured by the river side water level meters 15a and 15b.

  The water levels HA and HB are input to the data input unit 21 of the discharge flow control device 20. The data input unit 21 outputs water level HA and HB data to the calculation main body unit 22.

  FIG. 4 is a flowchart showing the calculation operation of the determined discharge flow rate Rd in the calculation main body 22.

  First, the data of the water level HA at the measurement point A is read by the conversion unit 31 (step S101).

  The data of the water level HA is converted into the measurement point flow rate Q1A at the measurement time point T1 of the measurement point A (step S102).

  The flow rate calculation unit 32 subtracts the pre-arrival discharge flow rate RtA from the measurement point flow rate Q1A to obtain the measurement natural flow rate Q2A (step S103).

In the determination unit 33, it is determined whether or not the natural flow rate Q2A during measurement is smaller than the reference flow rate QsA (step S104).
When the measurement natural flow rate Q2A is equal to or greater than the reference flow rate QsA, the discharge flow rate calculation unit 36 sets the calculated discharge flow rate Rn to zero (step S105). And in the discharge flow rate determination part 37, the decision discharge flow rate Qd is made into the calculation discharge flow rate Rn (step S106). Then, the calculation ends.

  On the other hand, when the measurement natural flow rate Q2A is smaller than the reference flow rate QsA, the increase / decrease amount calculation unit 34 calculates an increase / decrease amount dA obtained by subtracting the measurement natural flow rate Q2A from the natural flow rate QtA before arrival time (step S107). .

  In the prediction unit 35, based on the increase / decrease amount dA, the predicted natural flow rate Q3A at the time point T3A when the water discharged at the measurement time point T1 reaches the measurement point A is obtained. At the measurement point A, the predicted natural flow rate Q3A is an amount obtained by subtracting the increase / decrease amount dA from the measured natural flow rate Q2A (step S108).

  In the discharge flow rate calculation unit 36, the calculated discharge flow rate RnA is obtained by subtracting the predicted natural flow rate Q3A from the secured flow rate QnA (step S109).

  On the other hand, the conversion unit 31 reads data on the water level HB at the measurement point B (step S201).

  The data of the water level HB is converted into the measurement point flow rate Q1B at the measurement time point T1 of the measurement point B (step S202).

  The flow rate calculation unit 32 calculates the natural flow rate Q2B during measurement. Here, when the total amount of water before the arrival time RtB does not reach the measurement point B due to the distance from the dam 1 to the measurement point B, etc., the measurement point B for the discharge R is reached. A correction value r is set in advance based on the flow rate of water. For example, when the flow rate of water reaching the measurement point B is 80% of the discharge flow rate R, the correction value r is 0.8. Therefore, the natural flow rate Q2B during measurement is obtained by subtracting the pre-arrival time discharge flow rate RtB multiplied by the correction value r from the measurement point flow rate Q1B (step S203).

  In the determination unit 33, it is determined whether or not the natural flow rate Q2B during measurement is smaller than the reference flow rate QsB (step S204).

  When the measurement natural flow rate Q2B is equal to or higher than the reference flow rate QsB, the calculated discharge flow rate Rn is set to zero (step S105), and the determined discharge flow rate Qd is set to the calculated discharge flow rate Rn (step S106). Then, the calculation ends.

  On the other hand, when the measurement natural flow rate Q2B is smaller than the reference flow rate QsB, it is determined whether or not the measurement natural flow rate Q2B is larger than the lower limit reference flow rate Qs'B (step S205).

  When the measurement natural flow rate Q2B is equal to or lower than the lower limit reference flow rate Qs'B, the prediction unit 35 sets the predicted natural flow rate Q3B as the lower limit reference flow rate Qs'B (step S206). Based on the predicted natural flow rate Q3B, a calculated discharge flow rate RnB is obtained (step S209).

  On the other hand, when the measurement natural flow rate Q2B is larger than the lower limit reference flow rate Qs'B, the increase / decrease amount calculation unit 34 calculates an increase / decrease amount dB obtained by subtracting the measurement natural flow rate Q2B from the natural flow rate QtB before arrival time ( Step S207).

  In the prediction unit 35, based on the increase / decrease amount dB, a predicted natural flow rate Q3B at a time point T3B, which is a time point when the water discharged at the measurement time point T1 reaches the measurement point B, is obtained (step S208). At the measurement point B, the predicted natural flow rate Q3B is calculated using data in which the relationship between the water level HB at the past measurement point B and the average value of the increase / decrease amount dB is recorded.

  In the discharge flow calculation unit 36, a calculated discharge flow RnB is obtained by dividing the value obtained by subtracting the predicted natural flow Q3B from the reserved flow QnB by the correction value r (step S209).

  Next, in step S109 and step S209, it is determined whether or not the calculated calculated discharge flow rate RnA is smaller than the calculated discharge flow rate RnB (step S210).

  When the calculated discharge flow rate RnA is smaller than the calculated discharge flow rate RnB, it is determined whether or not the calculated discharge flow rate RnB is smaller than zero (step S211).

  When the calculated discharge flow rate RnB is smaller than zero, the calculated discharge flow rate Rn is set to zero (step S105).

  On the other hand, if the calculated discharge flow rate RnB is greater than or equal to zero, it is determined whether or not the calculated discharge flow rate RnB is smaller than the limit discharge flow rate Rl (step S212).

  When the calculated discharge flow rate RnB is smaller than the limit discharge flow rate Rl, the determined discharge flow rate Rd is set as the calculated discharge flow rate RnB (step S213). Then, the calculation ends.

  On the other hand, when the calculated discharge flow rate RnB is equal to or greater than the limit discharge flow rate Rl, the determined discharge flow rate Rd is set as the limit discharge flow rate Rl (step S214). Then, the calculation ends.

  In step S210, if the calculated discharge flow rate RnA is equal to or greater than the calculated discharge flow rate RnB, it is determined whether or not the calculated discharge flow rate RnA is smaller than zero (step S215).

  When the calculated discharge flow rate RnA is smaller than zero, the determined discharge flow rate Rd is set to zero (step S216). Then, the calculation ends.

  On the other hand, if the calculated discharge flow rate RnA is greater than or equal to zero, it is determined whether or not the calculated discharge flow rate RnA is smaller than the limit discharge flow rate Rl (step S217).

  When the calculated discharge flow rate RnA is smaller than the limit discharge flow rate Rl, the determined discharge flow rate Rd is set as the calculated discharge flow rate RnA (step S218). Then, the calculation ends.

  On the other hand, when the calculated discharge flow rate RnA is equal to or greater than the limit discharge flow rate Rl, the determined discharge flow rate Rd is set to the limit discharge flow rate Rl (step S214). Then, the calculation ends.

  Thus, based on the water levels HA and HB of the two measurement points A and B, by obtaining the determined discharge flow rate Rd based on the larger one of the calculated discharge flow rate RnA and the calculated discharge flow rate RnB, both measurement points A And B can satisfy the reserved flow rates QnA and QnB.

  In addition, the above-mentioned embodiment is an illustration of this invention, Comprising: This invention is not limited to this example.

  For example, the following configuration may be used.

  That is, in the above embodiment, the control of the discharge flow rate R by the control unit 25 is performed by controlling the opening degree of the valve 5 in the valve opening / closing unit 11, but is not limited thereto, and is performed in the intake pipe 4. It is good.

  Moreover, in the said Example, although the fluctuation | variation of the intake pipe 4 was rotated along the wall part 1a of the dam 1, it is not limited to this, By moving the intake pipe 4 up and down, the intake port 4a You may adjust the height.

  As described above, the present invention can appropriately control the discharge flow from the dam, so the discharge flow control system for the dam that controls the discharge flow of the water discharged downstream from the valve provided in the discharge channel of the dam. Etc. are useful.

It is a figure which shows schematic structure of the discharge facility to which the discharge flow rate control system of the dam which concerns on the Example of this invention is applied. It is a figure which shows the detail of the calculation main-body part of a discharge flow control apparatus. It is a flowchart which shows the calculation operation | movement of the calculation main-body part of a 1st Example. It is a flowchart which shows the calculation operation | movement of the calculation main-body part of a 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Dam 3 Drainage channel 5 Valve 6 Water 7 River 10 Moving part 11 Valve opening-and-closing part 15a River side water level meter 15b River side water level gauge 20 Discharge control device 22 Computation main body part 23 Storage part 24 1st memory part 25 Control part 26 Water pipe control unit 27 Second memory unit 31 Conversion unit 32 Flow rate calculation unit 33 Determination unit 34 Increase / decrease amount calculation unit 35 Prediction unit 36 Discharge flow rate calculation unit 37 Discharge rate determination unit d Increase / decrease amount A Measurement point B Measurement point H Water level Q1 Measurement point Flow rate Q2 Measurement natural flow rate Q3 Predicted natural flow rate Qn Secured flow rate Qs Standard flow rate R Release flow rate Rd Release flow rate Rl Limited release flow rate Rn Calculated discharge flow rate Rt Release flow before arrival time

Claims (9)

A discharge control system for a dam that controls the discharge of water discharged downstream from a valve provided in the discharge channel of the dam,
A water level meter for measuring the water level at the measurement point, which is the point where the water discharged from the valve reaches the time t in the river downstream of the dam;
A discharge flow rate control device for controlling the discharge flow rate of water discharged from the valve based on the water level measured by the water level meter;
With
The discharge flow control device
A calculation main body for calculating a determined discharge flow rate of water discharged from the valve;
A control unit for controlling the discharge flow rate of water discharged from the dam to the determined discharge flow rate calculated by the calculation main body unit;
Have
The calculation body is
A conversion unit that converts the water level measured at the measurement time T1 by the water level meter into the measurement point flow rate of the measurement point;
The natural flow rate at the time of measurement at the measurement point T1 of the measurement point is calculated by subtracting the pre-arrival time discharge rate, which is the flow rate of water from the valve, at the time point T2 before the measurement time point T1 from the measurement point flow rate. A flow rate calculation unit,
A prediction calculation unit that predicts a predicted natural flow rate at the measurement point at a time point T3 after a time t from the measurement time point T1, based on the natural flow rate at the time of measurement;
A discharge flow rate calculation unit for calculating the determined discharge flow rate based on the predicted natural flow rate;
A dam discharge control system. The discharge control system for a dam according to claim 1,
The discharge flow rate control system according to claim 1, wherein the discharge flow rate control device further includes a storage unit that stores data used for calculation of the calculation main body unit. In the discharge control system of the dam of Claim 1 or 2,
The discharge flow control device further includes a first memory unit that stores the determined discharge flow rate obtained in the discharge flow rate calculation unit,
The dam discharge flow rate control system, wherein the first memory unit outputs the determined discharge flow rate at the time point T2 to the flow rate calculation unit of the calculation main body unit as the discharge flow rate before the arrival time at the measurement time point T1. In the discharge control system of the dam of any one of Claim 1 to 3,
The calculation main body of the discharge flow control device is:
The measured natural flow rate obtained by the flow rate calculation unit is compared with a preset reference flow rate, and if the measured natural flow rate is greater than the reference flow rate, the determined discharge flow rate is set to zero. A discharge control system for a dam, further comprising a determination unit. In the discharge control system of the dam of any one of Claim 1 to 4,
The discharge flow rate calculation unit of the calculation main body in the discharge flow rate control device is:
A calculation discharge flow rate calculation unit for calculating a calculation discharge rate obtained by subtracting the predicted natural flow rate determined in the prediction calculation unit from a preset secured flow rate;
When the calculated discharge flow rate is smaller than zero, the determined discharge flow rate is set to zero. When the calculated discharge flow rate is zero or more, the calculated discharge flow rate and the maximum value of the discharge flow rate of water from the valve are set. A discharge flow rate determining unit that compares the calculated discharge flow rate and the limited discharge flow rate with the smaller one of the calculated discharge flow rate and the determined discharge flow rate,
A dam discharge control system. In the discharge control system of the dam of any one of Claim 1 to 5,
The prediction calculation unit
An increase / decrease amount calculation unit that calculates an increase / decrease amount obtained by subtracting the natural flow rate before arrival time, which is the natural flow rate at the time of measurement T2, from the natural flow rate at the time of measurement T1;
A prediction unit that predicts the predicted natural flow rate based on the increase / decrease amount;
A dam discharge control system. The discharge control system for a dam according to claim 6,
The discharge flow rate control device further includes a second memory unit that stores the measurement natural flow rate at the measurement time point T1,
The dam discharge flow rate control system, wherein the second memory unit outputs the natural flow rate during measurement at the time point T2 as the natural flow rate before arrival time at the measurement time point T1 to the prediction calculation unit of the calculation main body unit. In the discharge control system of the dam of any one of Claim 1 to 7,
A valve opening / closing part for opening and closing the valve;
The control unit of the discharge flow control device determines a degree of opening of the valve in the valve opening / closing unit for discharging water of the determined discharge flow calculated by the calculation main body from the valve. Flow control system. In the discharge control system of the dam of any one of Claim 1 to 8,
A dam water level meter that measures the water level of the dam,
A water intake for taking the water of the dam, and a water intake pipe for flowing the water of the dam through the water discharge channel;
A moving unit for moving the intake pipe to adjust the height from the bottom surface of the dam at the intake of the intake pipe;
Further comprising
The discharge flow rate control device further includes a intake pipe control unit that controls movement of the intake pipe in the moving unit in order to keep the height from the water surface of the dam to the intake port constant. Control system.

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