JPS61235914A - Gate controlling method - Google Patents

Abstract

PURPOSE:To improve the accuracy of a flow rate by decreasing the number of object gates which are operated at the same time and by the same opening, by one gate each, determining automatically the number of gates in which an error range against a target water discharge quantity is the smallest, and also no minute opening is generated, and a target opening, and executing a gate control. CONSTITUTION:A total target water discharge quantity SIGMAQ from a gate is determined by a method prescribed in advance from the present stored water level H, n=N and Q=SIGMAQ are set and a target water discharge quantity Q1 per one gate is derived, and based on this Q1 and the stored water level H, a target opening P to the target water discharge quantity Q1 is derived from a polygonal line approximate calculation of H-P-Q. The target opening P is a real number and made an integer P' by bringing it to a fractional processing so as to become 1cm unit, compared with a minute opening K, and in case of P'>K, the gate is controlled. From the polygonal line approximate calculation of H-P-Q, a water discharge quantity Q1' to the target opening P' is derived, and Q1'=Q/n=SIGMAQ/N is set, but in case there is the gate which is excluded in the checking process, a value divided a value Q=Q-Qi obtained by subtracting the present water discharge quantity Qi from the excluded gate, by n=n-1 gate becomes a target water discharge quantity Q1' per one control object gate.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a gate control method when two or more gates are installed in a dam/weir discharge facility. The present invention relates to a gate control method that accurately controls the discharge amount when controlled in units, and also takes into consideration that the water leakage prevention device is not damaged when the opening is minute.

[Background of the invention]

With conventional gate control methods, the discharge amount is not controlled with good accuracy, and the watertight rubber C (hereinafter referred to as water leak prevention device) used to prevent water from leaking from the bottom when the gate is fully closed is damaged. There is a risk that this may occur.

That is, in the conventional gate control method, the measured quantity 1
An openness meter in crn units is used to measure the target opening of one gate against the total target discharge from multiple hole gates in three dimensions: water level (H), discharge (Q), and opening (P). Since it is determined by a polygonal line approximation calculation or by a predetermined formula, a fraction occurs in the determined opening degree (P). Processing technology for this fraction has not been established, but so far, the control amount has been reduced to 1a.
It is necessary to make it into n units, and the actual situation is that gate control is performed by performing integer processing such as truncation or rounding to the tth number. However, when controlling in this way, an error occurs between the target discharge amount and the discharge amount after the control is performed, and if this occurs, there is a risk that the water leak prevention device may be damaged.

In addition, known documents regarding dam discharge equipment control include “
One example is "Design Specification Reference Book for Dam Discharge Facility Control Devices" (August 1981, published by the National Land Development Technology Research Center).

[Purpose of the invention]

An object of the present invention is to provide a gate control method based on the principle of operating nine gates to the same opening at the same time by using an opening meter with a measurement quantity of 1 cW 1 unit, and to perform fractional processing of the target opening and minute opening. In order to reduce the error between the actual discharge amount and the target discharge amount that occurs due to the conditions of An object of the present invention is to provide a gate control method that performs gate control while preventing the occurrence of damage.

[Summary of the invention]

For this purpose, the present invention is designed to reduce the accuracy of the actual discharge amount relative to the target discharge amount even though the opening is operated at the same time in principle, causing unnecessary disturbance to the water level and making it unstable. If the gate cannot be controlled and the minute opening is ignored in order to maintain the target discharge/volume, the water leak prevention device may be damaged by the flow velocity and water pressure applied to the water leak prevention device. This was done with a focus on the increase in In other words, while reducing the number of gates to be operated at the same time by one gate at a time, the number of gates and the target opening are automatically determined, with the smallest error range from the target discharge amount, and at which no minute opening occurs, and gate control is performed. It is a friend to do the same.

[Embodiments of the invention]

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

First, a gate control system according to the present invention will be explained. FIG. 2 shows an example of the system configuration. 8 in the figure is a gate as a controlled object, and in order to control this, the opening meter 1 measures the opening degree of the gate 8, and the gate 8
machine side panel 3 for monitoring and displaying the status of the gate 8 and for opening/closing the gate 8; a water measuring tower 7 for measuring the water level; and a gate 8.
(This diagram shows a river weir as an example, but in the case of a dam, there is only one water level meter) 2, which measures the upstream water level and downstream water level of the machine, and the machine side panel 3. The input/output relay device 4 is equipped with a function to protect the control device from lightning strikes on outdoor cables that have been installed, and a function to prevent erroneous commands and overoperation with respect to gate opening/closing signals, a processing device 6 that monitors and controls the gate 8, A process input/output device 5 having an interface function between the output relay device 4 and the processing device 6 is configured. For gate control, the target opening is determined by the processor 6 based on the water level gauge data B1, the opening gauge data A1, and the machine side status signal C, and the gate opening/closing signal is sent from the processor 6 to the machine side panel 3.
It is designed to be output to .

Now, to explain the gate control method according to the present invention, FIG. 1 shows a flow of an example of gate control processing in the processing device 6. As shown in FIG. In addition, this Figure 1 shows the overall function from the time when the controlled opening and target opening for the N gate are determined to when the gate is controlled, in comparison with the conventional technology. .

In the control process, first, the current water storage level H is taken in, and a total target discharge amount ΣQ from the gate with respect to the water storage level H1 or the inflow amount is determined using a predetermined method. Next, the initial values of the number of gates to be checked by this method and the total target discharge amount are n=N and Q=ΣQ, respectively, and the target discharge amount Ql per gate is calculated (Ql=Q
/n).

After this, H-P is based on the previous Ql and the imported water level H.
The target opening degree P for the target discharge amount Q1 is determined from the polygonal line approximation calculation of −Q. The method of polygonal line approximation calculation is the same as that of the conventional technology, but the obtained target opening degree P is a real number and is 1 m.
It is necessary to perform rounding to make an integer P' so that it is a unit. Comparing this target opening degree P' with a predetermined minute opening degree, if P')K, it is possible to control n gates; on the other hand, if P'(K), it becomes a minute opening degree. n
Control at the gate will not be possible. If control is possible, the discharge amount Ql' with respect to the target opening P' is determined from a polygonal line approximation calculation of HPQ based on the target opening P' and the water storage level H. This Q,' is the initial discharge amount, QI'=Q/
n = ΣQ/N, but if there is a gate excluded in the process of checking the controlled gates one by one, the value obtained by subtracting the current discharge amount Qi from the excluded gate is Q = Q - Q
Let the ratio value of dividing j by n=H·-1 gate be the target discharge amount Ql' per gate to be controlled. In addition, the total gate discharge amount at this time is Q from the controlled gate, /Xn, and ΣQi from the excluded gate (f is the non-controlled gate sl. This ΣQ' is the total target discharge amount ΣQ obtained before starting the control. On the other hand, if the number of gates is JQ, which is called the flow rate dead zone, it is possible to control n gates up to the target opening P', and if it is greater than ΔQ, the number of gates to be controlled is further reduced by one, and the number of gates per gate is increased again. This method recalculates the target discharge amount.If there are no gates that can be controlled in this way (n=o
) is to control all N gates at the optical target opening P' which is first determined.

Furthermore, if it is impossible to control n gates due to a flow rate dead zone or minute opening, reduce the number of target gates one by one, and while checking the flow rate dead zone, determine the same number of controllable gates n and the target opening P'. In the case of determining and controlling, the discharge amount error caused by converting the target opening degree P into an integer can be distributed evenly to the n controllable gates without concentrating it on just one gate, and the gate opening balance of the N gates can also be adjusted. It can be maintained to some extent. Note that when all the gates are excluded, the N gates are controlled at the target opening degree P' as in the conventional case. The broken line in the figure shows the conventional method.

FIGS. 3(a) to 3(C) show control operations when the present invention is applied to the problems of the conventional system.

However, here, as shown in Fig. 3(a), the flow rate dead zone Δ
Q = 2 m''/s, minute opening K = 1z, and the current opening of all gates is 2 cm.

Currently, when the water storage level H = 9 m% and the opening degree P = 2 cm, the discharge amount Q' per gate is calculated as follows from the H-P-Q line approximation calculation shown in Figure 3 (b). is required.

Q xy = Q m"/s Q ab = 3 m'/s - O Q' = (3-01〇 = 1.2 mJ/s
Therefore, the total discharge amount ΣQ' from the four gates is 4.
13 m''/s. In this state, if the total target discharge amount ΣQ; 24 m''/s is determined and t, the initial values of the gates to be controlled are n = 4 gates and Q = 24 m''/s.

The target discharge amount Ql per gate is Q, =Q/n=6m
'/s, water level H = 9m, target discharge amount QB = 6
The target opening degree P at m3/s is obtained as follows from the H-P-Q line approximation calculation.

Q ab = 3 m"/s Q ce = 9 m"/s "This P
= 7.5 cm is converted into an integer and P' = 7m, then P'
The four gates are controllable target gates for the t-th minute opening, which is larger than the minute opening K = 1 cm. On the other hand, the discharge amount Ql' at the target opening degree P'=7 and the water storage level H=9 m is calculated as follows from the HPQ broken line approximation calculation.

Q ab = 3 m'/s Q ce = 9 m'/s Since there are 0 non-target gates, the total discharge amount ΣQi from the non-target gates is ΣQ i = Om' /s. Therefore, when 4 gates are controlled with gate opening P' = 7 crn and t, the total discharge amount ΣQ' is ΣQ' = 5.4
ms/s X 4 +Om”/s = 21゜5m”/
3, and the error from the total target discharge amount ΣQ=24 m''/s is 1ΣQ'-ΣQ l=2.4 m''/S. Kono 14
The error of m”/s is the predetermined flow dead zone ΔQ
= 2 m'/s, so the four gates cannot be opened at seven angles. Therefore, the target opening degree P' is determined again by changing the number of target gates to three (n=3) and setting the total discharge amount from the non-target gates as ΣQ i = 1.2 m''/s.

n=n-1=4-1=3 gates n=Q-Qi=24-1゜2 = 2L8m'/sQ
t = Q/ n = 22.873 = 7.6 m”
/s Target discharge amount Q! = 7.6 m”/s, water level H
=9m, the target opening degree P is determined as follows.

Q ab = 3 m"/s Q ce = 9 m"/s If the target opening P', which is P converted into an integer, is P' = 8 crn, p/ is larger than the minute opening = 1cIr1, so n
= All three gates can be controlled. Next, target opening P'
= 8 cm, discharge amount Q1/ at storage level H = 9 m
If you search for it, you will get the following.

Q ab = 3 m'/s Qce = 9 m''/s In addition, there is one gate that is not targeted, but assuming that its discharge amount ΣQi is ΣQ = 1.2 m''/s, the gate opening degree is 8.
When controlling three gates with an, the total discharge amount ΣQ′
is ΣQ'=6.6m"/s X 3 + 1.2m"/
s ==21.0ms/S, and the total target discharge amount ΣQ
= 24 m''/s, the error is 3.9 m''/s. This error of 3.0 m”/s is also a flow dead zone ΔQ = l
Since it is larger than Q m''/s, the number of gates to be controlled is further reduced by one.

rl=n-1=3-1=2 gates n=Q -Q i = 22.8-1.2=21.6m
”/5Ql=Q/n=21.6/2=10.8m'/s
If you do the same calculation as last time under these conditions, P = 11, 5
cm, L9 and P'==11crn, then Ql'
= l O, 2m"/s.The total discharge amount ΣQ' at this time is 2 gates each for controlled and non-controlled gates, so Σ'Q' = 10.2 m"/s X 2+1
．． 2m"/s x 2=218m"/s. The discharge flow error in this case is 1.2 m"/S, which is smaller than the flow rate dead zone ΔQ = Z Om"/s. Therefore, as shown in Fig. 3(C), the two gates are set to the target opening degree of 11.
If the control is carried out vertically, it will be possible to bring the discharge rate closest to the target discharge rate of 24 m''/s.
The reference numeral 9 in FIGS.

Now, in order to clarify the extent of the effect of the present invention, we will calculate the opening degree (Pl) or the arbitrary water storage level (H) from the arbitrary water storage level IH) and the discharge amount (Q) that have been done so far.
The method of determining the discharge amount (Q) from the opening degree (P) and the opening degree (P) is explained below using FIGS. 4(a) and 4(b).

That is, in general, the discharge amount Q(R+ pt)s Q(II
pt◆l) is given by equations (1) and (2).

・・・・・・・・・(1) ・・・・・・・・・(2) Therefore, equations (1) and (2) t) P(!T,
Q)-Q(II-P) is determined as follows.

・・・・・・・・・(8) ・・・・・・・・・(4) Formulas (1) to (4) show general formulas, but M4 diagram (a),
(b) shows a specific example. In this case the fourth
Figure (b) is an enlarged view of a part of Figure 4 (a), but by the way, Qab, QCe, P
, Q are as follows.

Qb-Qa Q ab = (H-Ha) + Q a4
Hs Qce=”2S’ (H-Hsi + Q’4 H
a Q = −”' (Qce−Qab)+Qabz
Pt FIG. 5 specifically shows the control in that case. As shown in the figure, for example, when there are four gates to be controlled and the current water level H is 9 m, the total target discharge amount Σ from all gates
Q is ΣQ == 24 rn''/S % If the target discharge amount Q per gate is Q=5 m''/s, the target opening degree P of the gate is determined as follows.

Q ab = −(9-8)+ 2 = 3 m”/
sQ ce = '-"-(9-8) + 8 = 9
m”/sP = (10-5)+5 =7.
5 cm However, since the measurement unit for measuring the opening degree of the gate is a 1 crnO opening meter, P = 7.5
It is impossible to perform control with α. For this reason, a fraction occurs in the calculated target opening degree, and in the case of a hole, P =
A 7 cm hook hole has no choice but to be P = 8 strokes.

In this example, P = 7 cm. As a result of controlling the gate with the rounded target opening degree of 7crr&, the discharge amount is as follows.

ΣQ'= 5.4
, an error of 2.4 m''/s will occur in total.The target opening degree P obtained here will be
If the opening degree is within the predetermined range of t minute opening to prevent damage to the valve, gate control may be performed, but this will eventually result in an error in the target discharge amount. In other words, in the conventional method, the measurement unit of the opening meter is IG, so if the opening is controlled at the same time, an error (proportional to the number of gates) will occur between the target discharge amount and the actual discharge amount. This will cause unnecessary disturbance to the position H. Incidentally, P =
In the case of 8 cm, Q'='6.6ms/S, Σ
Q' = 26.4 m'/s.

Finally, the effects of the present invention will be explained with reference to FIGS. 6(a) and 6(b). Figure 6 (a), (b)
are the changes in the water level in the case of gate open control and the case of gate closed control, respectively. The method according to the present invention is shown as a solid line, and the method according to the conventional method is shown as a broken line. However, in the case of the conventional method, unnecessary disturbances or fluctuations are clearly observed in the water level. . That is, in the conventional system, in the case of open control, fractions are processed, and when the opening degree t is insufficient, as shown in Fig. 6 (a)
As shown in Figure 2, the water level gradually increases. On the other hand, in the case of closed control, if the number of openings is not small due to rounding, the discharge amount becomes large, and the water storage level gradually decreases.

〔Effect of the invention〕

As explained above, in the case of the present invention, in controlling a gate using a position meter whose measurement quantity is one unit, a specific gate is used to prevent a flow rate error that occurs due to the resolution of 1 cW1. Rather than allocating the error flow rate to the gates, the flow rate is distributed equally to controllable gates, which improves flow rate accuracy. There are no problems with water pressure on the gate or changes in the river bed. Further, unnecessary fluctuations in the water level that occur when gate opening/closing control is not performed can be prevented, so that stable t-gate control can be performed. Furthermore, since minute openings are taken into account, damage to the water leakage prevention device is also prevented.

[Brief explanation 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, and FIG. 2 is a diagram showing a system configuration in an example of a gate control system according to the present invention.
3(a), (b), and (C) are diagrams specifically explaining the gate control method according to the present invention, and FIG. 4(a)
), (b) / and Fig. 5 are diagrams specifically explaining how to determine the opening degree and discharge amount in the conventional method and its gate control, and Fig. 6 (a) and (b) are , is a diagram for explaining the extent of the effect of the present 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 gauge base, 8... Gate.

Claims (1)

[Claims] 1. The opening degrees of a plurality of gates each equipped with an opening meter with a measurement unit of 1 cm are obtained from the known relationship between water level - discharge amount - opening degree, and then rounded. In the gate control method in which multiple gates are controlled based on the processed opening degree, the number of gates and the target number that minimize the error range from the target discharge amount while reducing the number of gates that are operated with the same opening degree one by one. A gate control method characterized by automatically determining the opening degree and controlling the gate. 2. When the target opening becomes less than a predetermined minute opening, reduce the number of gates that are operated simultaneously with the same opening one by one, and determine the number of gates that minimizes the error range from the target discharge amount. The gate control method according to claim 1, wherein the target opening degree is automatically determined and gate control is performed.