JPH0616247B2 - Gate control method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gate control method in the case where two or more gates are installed in a dam / weir discharge facility, and in particular, the gate opening is in a unit of 1 cm. The present invention relates to a gate control method in which the discharge flow rate is controlled with good accuracy when controlled in accordance with the above-mentioned control, and in addition, the water leakage prevention device is considered not to be damaged at a minute opening.

[Background of the Invention]

In the conventional gate control methods, the discharge amount is not controlled accurately, and the watertight rubber (hereinafter referred to as the water leakage prevention device) to prevent water leakage from the bottom when the gate is fully closed is damaged. There is a risk that
That is, in the conventional gate control method, the measured amount 1
Three-dimensional polygonal line of the water level (H), discharge (Q), and opening (P) Since it is obtained by approximation calculation or by a predetermined formula, a fraction is generated in the obtained opening (P). A processing technology for this fraction has not been established, but until now it has been necessary to make the control amount in 1 cm units, and for this reason, integer processing is performed by rounding or rounding, and gate control is performed. Is the actual situation. However, in the case of controlling in this manner, there is a problem that an error occurs between the target discharge amount and the discharge amount after the control is executed, and as a result, unnecessary disturbance is given to the water storage level (H). Further, when the minute opening control is performed, the water leakage prevention device may be damaged.

In addition, as a publicly known document about dam discharge facility control,
"Reference document for design specifications of dam discharge facility control device" (Showa 57)
Issued by the National Land Development Technology Research Center in August 2012).

[Object of the Invention]

An object of the present invention is to provide a gate control method in which a gate using an opening meter with a measurement amount of 1 cm unit is operated at the same time for a plurality of gates. In order to reduce the error of the actual discharge amount against the target discharge amount that occurs from the condition of (1), the gate opening balance is kept as much as possible while keeping the gate opening balance as small as possible by evenly distributing it to all the controllable gates that do not correspond to one gate. It is to provide a gate control method for performing gate control while preventing occurrence of frequency.

[Outline of Invention]

For this purpose, the present invention is stable in principle even if the same opening operation is performed, by reducing the accuracy of the actual discharge amount with respect to the target discharge amount and giving unnecessary disturbance to the reservoir level. Gate control cannot be performed, and if a small opening is ignored to protect the target discharge rate, the water leakage prevention device may be damaged by the flow velocity and water pressure applied to the water leakage prevention device, increasing the number of gate maintenance times. It was made with a focus on doing. That is, a plurality of openings of a gate equipped with an opening meter with a unit of measurement of 1 cm are subjected to rear rounding, which is obtained from the known relationship of water storage level-discharging flow rate-opening, to the rounded opening. When the plurality of gates are controlled, the target opening is determined from a known water level-discharging flow-opening as a predetermined small opening or less, or within a dead zone of the flow rate. In order to minimize the error of the actual discharge amount with respect to the target discharge amount, the number of gate gates controlled as the same simultaneous opening and the target opening amount for the gates are determined and operated as the simultaneous same opening amount. The gate control is performed while reducing the number of gates.

Example of Invention

 The present invention will be described below with reference to FIGS. 1 to 6.

First, the gate control system according to the present invention will be described. FIG. 2 shows a system configuration as an example. Reference numeral 8 in the figure denotes a gate as a control target. An opening meter 1 for measuring the opening of the gate 8 to control the gate, a machine side for monitoring / displaying the state of the gate 8 and for opening / closing the gate 8. Panel 3, water measuring tower 7 for measuring water level, water level meter for measuring upstream and downstream water levels of gate 8 (in this figure, weirs of rivers are taken as an example, but in case of dams, water level gauge 1 I / O relay that is equipped with a function to protect the control device due to lightning strikes on the outdoor cable laid between the stand 2) and the machine side panel 3, and to prevent erroneous commands for gate opening / closing signals and overoperation. The processing unit 6 includes a device 4, a processing device 6 for monitoring and controlling the gate 8, an input / output relay device 4, and a process input / output device 5 having an interface function with the processing device 6. In the gate control, the processing device 6 obtains a target opening based on the water level gauge data B, the opening gauge data A, and the machine side state signal C, and the gate opening / closing signal D is output from the processor 6 to the machine side board 3. It is something like this.

Now, the gate control method according to the present invention will be described. FIG. 1 shows a flow of an example of gate control processing in the processing device 6. It should be noted that FIG. 1 shows the function of determining the number of gates to be controlled and the target opening for the gate N and performing gate control as a whole, in comparison with the prior art. .

In the control process, first, the current storage level H is taken in and the storage level H or the total target discharge amount ΣQ from the gate with respect to the inflow amount is determined by a predetermined method. Next, this time, the number of gates to be checked by this method and the initial values of the total target discharge amount are set to n = N and Q = ΣQ, respectively, and the target discharge amount Q ₁ per gate is obtained (Q ₁ = Q /
n). After this, H based on this Q ₁ and the stored water level H
The target opening degree P with respect to the target discharge flow rate Q _{1 is} obtained from a polynomial approximation of -P-Q. The polygonal line approximation calculation method is the same as the conventional technique, but the calculated target opening P is a real number and
It is necessary to perform fractional processing so that the unit is cm, and to obtain an integer P '. If this target opening P'is compared with a predetermined small opening K and P '> K, it is possible to control the gates of n gates, while if P'<K, it becomes a small opening. Control at the nth gate is not possible. When controllable, the discharge flow rate Q ₁ ′ for the target opening P ′ is obtained from the broken line approximation calculation of HPQ based on the target opening P ′ and the water storage level H. This Q ₁ ′ is Q ₁ ′ = Q / n =
ΣQ / N, but if there is a gate excluded in the process of checking the gates to be controlled one by one, the value Q = Q-Qi obtained by subtracting the current discharge amount Qi from the exclusion gate is n = n- The target discharge rate Q ₁ ′ per gate to be controlled is the value divided by 1 gate. At this time, the total gate discharge is Q ₁ ′ × n from the controlled gate and from the exclusion gate (I indicates the number of gates outside the control target), so the total discharge ΣQ ′ after control is Is. If this ΣQ ′ is | ΣQ′−ΣQ |> the flow dead zone ΔQ with respect to the total target discharge ΣQ obtained before the start of control, the n gates can be controlled up to the target opening P ′. If ≦≦ flow rate dead zone ΔQ, the number of gates to be controlled is further reduced by 1 and the target discharge rate per gate is calculated again. If there is no controllable gate in this way (n = 0), the target opening P ′ that was initially obtained is obtained.
Controls all gates N.

In this way, when gate control of n gates is impossible due to the flow dead zone or a minute opening, the number of target gates is decreased by one gate, and the number n of controllable gates and the target opening P ′ are checked while checking the flow dead zone. In the case of controlling the gate opening, it is possible to evenly distribute the discharge amount error due to the integerization of the target opening P to the n controllable gates without concentrating on one gate, and to balance the gate opening balance of the N gates. Can be maintained to some extent. When all gates are excluded, the gates of N gates are controlled at the target opening P'as in the conventional case. The broken line in the figure shows the conventional method.

FIGS. 3 (a) to 3 (c) show the control operation when the present invention is applied to the problems of the conventional method. However,
Here, as shown in Fig. 3 (a), the dead zone ΔQ = 2m ³
/ S, minute opening K = 1 cm, and the current opening of all gates is 2 cm.

At present, when the water storage level is H = 9 m and the opening P = 2 cm, the discharge rate Q ′ per gate is HP-Q shown in FIG. 3 (b).
It is obtained as follows from the broken line approximation calculation of.

Therefore, the total discharge ΣQ ′ from the four gates is 4.8.
m ³ / s. In this state, total target discharge ΣQ = 2
When 4 m ³ / s is determined, the initial values of the controlled gate are n = 4 gates and Q = 24 m ³ / s. The target discharge Q ₁ per gate is Q ₁ = Q / n = 6m ³ / s, and the reservoir level H =
The target opening P at 9 m and the target discharge Q ₁ = 6 m ³ / s is H
It is obtained as follows from the -P-Q polygonal line approximation calculation.

If P = 7.5 cm is converted into an integer and P '= 7 cm, P'is larger than the minute opening K = 1 cm, and therefore all four gates are controllable gates for the minute opening. On the other hand, the discharge Q ₁ ′ at the target opening P ′ = 7 cm and the water storage level H = 9 m is H−
It is as follows from the PQ broken line approximation calculation.

Further, since there are no gates outside the target, the total discharge amount ΣQi from the gate outside the target is ΣQi = 0 m ³ / s. Therefore, when the gates of four gates are controlled with the gate opening P ′ = 7 cm, the total discharge ΣQ ′ is ΣQ ′ = 5.4 m ³ / s × 4 + 0 m ³ /
s = 21.6 m ³ / s and total target discharge amount ΣQ = 24 m ³ /
The error from s is | ΣQ'-ΣQ | = 2.4 m ³ / s. This 2.4 m ³ / s error is due to a predetermined flow dead zone ΔQ =
Since it is larger than 2m ³ / s, the gates of 4 gates cannot be opened to 7cm. Therefore, the target gate is set to 3 gates (n
= 3), the total discharge from the excluded gates is ΣQi
= 1.2 m ³ / s, the target opening P'is obtained again.

n = n-1 = 4-1 = 3 Mon Q = Q-Qi = 24-1.2 = 22.8m 3 / s Q 1 = Q / n = 22.8 / 3 = 7.6m 3 / s goals When the discharge rate Q ₁ = 7.6 m ³ / s and the water storage level H = 9 m, the target opening P is obtained as follows.

If P '= 8 cm is the target opening P', where P is an integer,
Since P ′ is larger than the minute opening K = 1 cm, n = 3 gates can be controlled. Next, the discharge amount Q ₁ ′ at the target opening P ′ = 8 cm and the stored water level H = 9 cm is calculated as follows.

In addition, although there is one non-target gate, if the discharge amount ΣQi is ΣQ = 1.2 m ³ / s and three gates are controlled with a gate opening of 8 cm, the total discharge amount ΣQ ′ is ΣQ ′ = 6.
6m ³ /s×3+1.2m ³ /s=21.0m ³ / s, and the error from the total target discharge rate ΣQ = 24m ³ / s is 3.0m ³ / s. This error of 3.0 m ³ / s is also a flow dead zone ΔQ = 2.0 m ³ / s
Since it is larger, the number of gates to be controlled is further reduced by one.

n = n-1 = 3-1 = 2 Gate Q = Q-Qi = 22.8-1.2 = 21.6m 3 / s Q 1 = Q / n = 21.6 / 2 = 10.8m 3 / s If the same calculation as the previous time is performed under this condition, P = 11.5cm,
Therefore, if P '= 11 cm, then Q ₁ ' = 10.2 m ³ / s. At this time, the total discharge amount ΣQ ′ is 2 gates each for the control target and the non-control target gate, so ΣQ ′ = 10.2 m ³ /
s × 2 + 1.2 m ³ /s×2=22.8 m ³ / s. The discharge error in this case is 1.2 m ³ / s, which is smaller than the dead zone ΔQ = 2.0 m ³ / s. Therefore, Fig. 3 (c)
By controlling the two gates with a target opening of 11 cm as shown in, it is possible to bring the discharge rate closest to the target discharge rate of 24 m ³ / s. The reference numeral 9 in FIGS. 3 (a) and 3 (c) indicates the water leakage prevention device described above.

Now, in order to clarify the degree of the effect of the present invention, the opening (P) or the arbitrary storage level (from the arbitrary storage level (H) and discharge (Q) that have been used up to now H)
The method for obtaining the discharge flow rate (Q) from the opening degree (P) will be described below with reference to FIGS. 4 (a) and 4 (b).

That is, the discharge amount Q _{(H, Pi)} , Q _{(H, Pi + 1)} is generally given by the equations (1) and (2).

Therefore, P _{(H, Q)} and Q _{(H, P)} are obtained from the equations (1) and (2) as follows.

Formulas (1) to (4) show general formulas, and FIGS. 4 (a) and 4 (b) show specific examples thereof. In this case, Fig. 4 (b) is Fig. 4
A part of (a) is enlarged and displayed. Incidentally, Qab, Qce, P and Q in the figure are as follows.

FIG. 5 specifically shows the control in that case. As shown in the figure, for example, when the number of controlled gates is 4 and the current reservoir level H is 9 m, the total target discharge amount ΣQ from all gates is ΣQ = 24 m ³ / s, and the target discharge amount Q per gate is Q.
= 6 m ³ / s, the target opening P of the gate is calculated as follows.

However, since the gate opening is measured by an opening meter whose measuring unit is 1 cm, it is impossible to execute the control at P = 7.5 cm. Therefore, as a process when a fraction occurs in the obtained target opening, P = 7 cm or P =
There is no choice but to make it 8 cm. In this example, P = 7 cm. As a result of controlling the gate with a target opening of 7 cm after rounding, the discharge rate is as follows.

With this, the target discharge and the actual discharge are 0.6 m ³ / gate per gate.
s, a total error of 2.4 m ³ / s will occur. Further, the target opening P obtained here is the water leakage prevention device 9
In the case of being in the range of a predetermined minute opening degree in order to prevent the damage of the gate, the control of the gate cannot be performed, and an error is eventually generated with respect to the target discharge amount. That is, in the conventional method, since the measurement unit of the opening meter is 1 cm, simultaneous opening control causes an error (proportional to the number of gates) between the target discharge flow rate and the actual discharge flow rate. This will give unnecessary disturbance to position H. By the way, P = 8
In the case of cm, Q '= 6.6 m ^{3 / s,} ΣQ' = 26.4 m ³
/ S.

Finally, the effects of the present invention will be described with reference to FIGS. 6 (a) and 6 (b). FIGS. 6 (a) and 6 (b) show changes in the water storage level under the gate opening control and the gate closing control, respectively. The one according to the present invention is shown as a solid line display, and the one according to the conventional method is shown as a broken line display. However, in the case of the conventional method, it is apparent that unnecessary disturbance or fluctuation is recognized in the reservoir level. . That is, in the conventional system, when the fractionally processed opening is insufficient in the case of the open control, the water level gradually increases as shown in FIG. 6 (a). On the other hand, in the case of the closed control, if the fractionally processed opening is not small, the discharge amount becomes large, so that the water storage level gradually decreases.

[Effect of the invention] As described above, in the case of the present invention, the measured amount is 1 cm.
In gate control using a unit opening meter, a gate that can be controlled rather than allocating the flow rate for the error to one specific gate to prevent the flow rate error that occurs because the resolution is 1 cm Since it is evenly distributed, the flow rate accuracy can be improved, and since the gate openings are almost the same, there is no problem with water pressure to a specific gate or changes in the riverbed. Further, it is possible to prevent unnecessary fluctuations in the water storage level that occur when the gate opening / closing control is not executed, so that stable gate control can be performed. Furthermore, since the minute opening is also taken into consideration, damage to the water leakage prevention device can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram showing a flow of gate control processing in an example of a gate control method according to the present invention, FIG. 2 is a diagram showing a system configuration in an example of a gate control system according to the present invention, and FIG. ), (B) and (c) are diagrams for specifically explaining the gate control method according to the present invention, FIGS. 4 (a), (b) and 5
FIG. 6 is a diagram for specifically explaining how to determine the opening degree or the discharge amount and the gate control in the conventional method, FIG.
(a), (b) is a figure for demonstrating the grade of the effect by this invention. 1 ... Openness gauge, 2 ... Water level gauge, 3 ... Machine side panel, 4 ... Input / output relay device, 5 ... Process input / output device, 6 ... Processing device, 7 ... Water measuring tower, 8 ... …Gate.

Claims (1)

[Claims] 1. A plurality of openings of a gate equipped with an opening meter having a unit of measurement of 1 cm, which has been rounded and rounded after a rounding operation, which is obtained from a known relationship between water storage level-discharge rate-opening degree. When the plurality of gates are controlled based on the opening, the target opening is determined as a predetermined opening less than or equal to a predetermined small opening, or within a dead zone of the flow rate, based on a known relationship of water storage level-discharge flow rate-opening degree. In this case, in order to minimize the error of the actual discharge amount with respect to the target discharge amount, the number of gate gates controlled as the same simultaneous opening amount and the target opening amount for the gates are determined, and then the same simultaneous opening amount is determined. A gate control method in which gate control is performed while reducing the number of gates operated as.