JPS6337407A - Automatic controller for dam gate - Google Patents

Abstract

PURPOSE:To minimize the gate operating error by varying the extent of overoperation of each gate, which stops the gate at a prescribed target degree of opening, in accordance with the water pressure applied to the gate and correcting the extent of overoperation at each time in accordance with the actual result value after gate operation. CONSTITUTION:When the water pressure applied to a gate 5 is denoted as Q and the distance from the lower end to the water surface is denoted as (h), the extent of over-operation DELTA is obtained as a function Fui (Q, h) if the gate is operated in the rising direction, and it is obtained as a function FDi (Q, h) if the gate is operated in the falling direction. When the current extent of overoperation DELTA is obtained, the gate 5 is operated DELTAcm before the target degree of opening. A time T1 is allowed to completely stop the gate and stablize the degree of opening, and it is decided whether the gate operation is normally terminated or not. The processing is terminated if it is abnormally terminated; but if it is normally terminated, a current degree of opening Di of the gate (i) is inputted to obtain an extent of overoperation DELTA' based on the actual degree of opening. That is, DELTA' is equal to DELTA+Dio-Di where Doi is the target degree of opening, and functions Fui and FDi are corrected with DELTA' for the purpose of reflecting them on DELTA at following times.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a dam gate automatic control device.

[Conventional technology]

Various types of control equipment in the electric power field are increasingly being automated to reduce the burden on operators, and dam control equipment is no exception to automation. Devices that automatically operate dam gates by setting the gate opening numerically are becoming popular, instead of automatically calculating the gate opening or raising and lowering the gate manually. There is.

Along with this, how accurately the gate operation can be performed automatically is an important issue, and there is a growing demand for automation, especially in small dams that were not previously automated. Normally, a slight error in the gate opening greatly affects the dam water level, so it is particularly important to accurately stop the gate at the target opening.

For this reason, for example, in a device as shown in FIG.
In order to stop the gate at a predetermined target opening degree, a processing method as shown in FIG. 2 is used.

Here, FIG. 1 shows an automatic gate control device, which inputs various dam quantities and outputs a rise/fall signal to the gate.

2 is a target opening degree set from the outside or calculated inside the device, 3 is a water level gauge, 4 is an opening gauge, and 5 is a gate.

FIG. 2 is a typical flowchart of the conventional method for operating the gate after the target opening degree is determined.

In step 6, determine the operating direction of the gate, and in case of upward movement, in step 7, substitute the upward direction overoperation amount Δi unique to gate i to the current gate vortex movement amount Δ; in case of downward movement, in step 8, substitute the gate i-specific overoperation amount Δi. The descending direction overoperation amount Δi' is substituted into the current overoperation amount Δ.

Here, the overoperation amount Δ is the target function Δ during gate operation.
This value means that if the gate is stopped one minute before opening, it will stop accurately at the target opening. Once the current overoperation amount Δ is determined,
At 9, the gate i is started, and at 10 and 11, whether or not the opening degree has been operated to 61 points before the target function is monitored at a cycle of T seconds.
When the opening degree reaches 61 points before the target opening degree, gate i is stopped at 12 points.

[Problem that the invention seeks to solve]

The appropriate value of the gate vortex operation amount is normally considered to vary depending on various conditions such as water level and discharge amount, but in the above conventional technology, the gate vortex operation amount is fixed by raising and lowering each gate, so the gate Some errors were unavoidable in order to stop the valve at a predetermined target opening degree.

In order to prevent this, if we were to measure in advance the amount of gate vortex movement that varies depending on various conditions such as water level and flow rate, all gates would have to be raised and lowered at various water levels and opening degrees. Unlike other plants, it was actually possible to actually measure the amount of gate vortex movement in advance, as water had to actually be released downstream.

) An object of the present invention is to obtain an appropriate value of the gate vortex motion amount without actually measuring it in advance, and to minimize gate motion errors.

[Means for solving problems]

The above purpose is to make the gate vortex operation amount to stop the gate at a predetermined target opening degree variable for each gate depending on the water pressure applied to the gate, and to correct the overoperation amount each time based on the actual value after gate operation. This can be achieved by doing.

[Effect]

Since the overoperation amount of each gate is made variable by the water pressure applied to the gate, the optimum amount of gate vortex operation can always be obtained, and the error required to stop the gate at a predetermined target opening degree can be minimized. Furthermore, since the gate vortex operation amount is corrected based on the actual value, there is no need to collect actual measurement data in advance.

〔Example〕

Hereinafter, an embodiment of the present invention will be explained with reference to FIG.

FIG. 3 is a flowchart when operating the gate after the target opening degree is determined. First, the operating direction of the gate is determined in step 6. If it is in the upward direction, it is determined by the function to obtain the appropriate amount of gate vortex movement in the opening direction in step 13. The distance ah to the water surface is a parameter. In the case of the downward direction, Δ=FDi (Q, h) (2) at 14. Here, FDi (Q, h), like Fui (Q, h), is a function that obtains an appropriate amount of overoperation in the closing direction of gate i. If the current overoperation amount Δ is found, 9, 10, 11
．． 12, the gate is operated up to six points before the target function, as in the conventional method. After stopping the gate, as shown in step 15, the gate waits for an appropriate time T1 seconds until the gate completely stops and the opening becomes stable, and it is determined in step 16 whether the gate has finished operating normally. If the process ends abnormally, the process ends; if it ends normally, the current opening degree Di of the gate i is input in step 17.

In step 18, the overoperation amount Δ' is calculated based on the actual opening degree.

Here, Δ' can be calculated by correcting Δ calculated in 13 or 14 by the deviation between the actual opening and the target opening, so if the target opening is Doi, then Δ'=Δ+Doi-Di (3) is given by In order to reflect this Δ′ in the next Δ,
9, the function Fui or FDi may be corrected by Δ'.

゛,ゝIn this way, according to the present invention, it is always possible to
The corrected gate vortex motion amount Δ is obtained.

〔Effect of the invention〕

According to the present invention, since the gate vortex operation amount Δ is corrected every time based on the actual value, the gate operation error can be minimized. Another advantage is that there is no need to actually measure the amount of gate vortex operation in advance.

Furthermore, since the gate vortex operating amount is corrected each time based on actual values, it has the effect of being able to cope with changes in gate operating characteristics over time due to aging etc.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus to which the present invention can be applied. FIG. 2 is a flowchart explaining a conventional method, and FIG. 3 is a flowchart explaining an embodiment of the present invention. 1... Gate automatic control device, 2... Target opening degree, 3...
...Water level gauge, 4...Opening degree gauge, 5...Gate, 6-1
9...Flowchart block.

Claims (1)

[Claims] 1. In a dam gate automatic control device that raises or lowers a dam gate to a predetermined target opening using a control computer, etc., each over-operation amount is calculated to stop the gate at a predetermined target opening. Automatic dam/gate control characterized in that it is variable depending on the water pressure applied to the gate each time the gate rises or falls, and that the overoperation amount is corrected each time based on the actual value after actually operating the gate. Device.