JPH04102611A - Constant water level control device - Google Patents

Abstract

PURPOSE:To keep the water level of a dam, a weir and the like constant, and thereby assume accurate water level control by computing gate opening in response to a corrected target effluent rate, and thereby furthermore assuming the open/close control of a gate in response to the gate opening. CONSTITUTION:In an item operating section 12, a water level H from a water level meter, an opening P from an opening meter, and monitor information SV from a field operation panel are inputted respectively, so that an inflow rate Qi is thereby computed with an effluent rate Qo computed. In the second place, a variation rate and the like are computed by a target effluent rate computing section 14 based on the effluent rate Qi as a target effluent rate before correction. The variation rate and the like thus obtained are applied to a target effluent rate correction value computing section 18, so that fuzzy inference is thereby run about a prediction rate by a fuzzy inference section 16. Meanwhile, the water level H and a corrected target effluent rate Qob are applied to a target opening computing section 22 from the target effluent rate computing section 14, so that a target opening Pob is thereby computed based on these information so as to be applied to an open/close control section 24. And in the open/close control section 24, an opening P at present and monitor information SV are inputted, and gate valve open/close command signals are thereby generated based on the target opening Pob.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant water level control device for maintaining a constant water level in a dam, weir, etc., and particularly relates to an improvement in means for correcting a target discharge amount.

[Prior Art] Conventionally, constant water level control devices for maintaining a constant water level in dams, weirs, etc. have been known. This device is a Vt device that calculates a target discharge amount according to the current water level, etc., and controls the water level by opening and closing a gate.

Further, as methods for calculating the target discharge amount, a water level deviation method and an inflow amount control method are known.

The water level deviation method is a method in which when the water level changes, a discharge amount predetermined according to the water level deviation is set as a target discharge amount and water is discharged.

Furthermore, the inflow control method is a method in which the amount of water flowing into a dam or the like, that is, the inflow amount, is determined, and an amount corresponding to this inflow amount is set as the target discharge amount.

[Problems to be Solved by the Invention] However, in the past, there were the following problems in calculating the target discharge amount.

First, in the water level deviation method, the target discharge amount is determined according to changes in the water level, so control is inevitably delayed control.

Furthermore, in the inflow amount control method, a delay time occurs in the inflow amount calculation, so that the control is also delayed.

Furthermore, in the inflow rate control method, various error factors are included in the inflow rate calculation, so it is difficult to accurately calculate the inflow rate, and the target discharge rate cannot be set accurately.

In order to avoid such delayed control and eliminate inaccuracies in inflow amount calculations, etc., appropriate correction may be made to the target discharge amount calculated by the inflow amount control method. Previously, there was a known device that tried to perform this kind of correction, but this device can only execute the correction calculation method that is set in advance in the program, so it is difficult to calculate the amount of water flowing into dams, weirs, etc., or the current water level. It is not possible to make flexible corrections according to real situations.

As described above, in the past, it was difficult to maintain a constant water level with high precision.

The present invention was made with the aim of solving these problems, and makes it possible to perform more accurate water level control by faithfully reflecting the experience of experts in the target discharge amount correction value. The purpose is to provide a constant water level control device.

[Means for Solving the Problems] In order to achieve such an object, the present invention includes a various amount calculating section that calculates the current inflow amount of a dam, weir, etc., and a system that calculates the amount of water to be released based on the inflow amount. A target discharge amount calculation means for calculating a certain target discharge amount, a change amount calculation means for calculating a change amount, etc. indicating a change trend in the water level and inflow amount based on the water level and inflow amount, and performing fuzzy inference regarding the change amount, etc. a target discharge amount correction value calculation unit that calculates a target discharge amount correction value by;
A target discharge amount correction means that corrects the target discharge amount based on the target discharge amount correction value, a gate opening degree calculation unit that calculates the gate opening degree according to the corrected target discharge amount amount, and a gate opening degree calculation unit that opens and closes the gate according to the gate opening degree. and an opening/closing control unit that controls the water level of a dam, weir, etc. to be constant, and is characterized in that it performs fuzzy control of the water level.

[Function] In the water level constant control device of the present invention, first, the current amount of inflow into the dam salt etc. is calculated by the various quantity calculation section, and the target discharge amount is calculated based on the calculated inflow amount. Furthermore, the amount of change, etc. is calculated based on the inflow amount and water level. The amount of change is a quantity that indicates a change trend in water level and inflow amount, and includes, for example, water level deviation, water level deviation increase rate, inflow rate increase rate, and inflow rate increase acceleration.

On the other hand, the target discharge amount correction value calculation unit performs fuzzy inference regarding the amount of change, etc., and calculates the target discharge amount correction value. This target discharge amount correction value is used for correcting the target discharge value in the target discharge amount correction means.

The target discharge amount corrected in this way is used to calculate the gate opening degree. That is, the gate opening degree is calculated according to the corrected target discharge amount, and the gate is further controlled to open and close according to this gate opening degree.

As a result, the water level in dams, weirs, etc. will be maintained constant. At this time, the experience of experts can be reflected in the membership functions and rules of fuzzy inference, making it possible to perform flexible water level control according to the situation.

[Example] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of a constant water level control device 10 according to an embodiment of the present invention.

The water level constant control device 10 shown in this figure includes a various amount calculation section 12, a target discharge amount calculation section 14, and a fuzzy inference section 16.
a target discharge amount correction value calculation section 18 and a setting water level section 2.
0, a target opening calculation section 22, and an opening/closing control section 24.

-Next, the operation of this embodiment will be explained.

The various quantity calculation unit 12 inputs the water level H from the water level meter, the opening degree P from the opening meter, and the monitoring information Sv from the machine side panel, and
Discharge amount Q. Calculate the water level H and the calculated discharge amount Q
The inflow amount Q1 is calculated based on. Alternatively, change the opening degree to P and set the discharge amount to Q. and perform similar calculations.

The target discharge amount calculation section 14 sets the inflow amount Q1 calculated in the various quantity calculation section 12 as the target discharge amount before correction, and further,
The amount of change, etc. is calculated based on the water level H and inflow amount Q1 supplied from the various quantity calculation section 12 and the set water level H supplied from the set water level section 20.

In this embodiment, the amounts adopted as the amount of change, etc. are the water level deviation DH and the water level deviation increasing rate DDH.

They are the inflow rate increase speed DQ and the inflow rate increase acceleration DDQl. These amounts are calculated based on the following formula.

DB-H-HS DDH-ΔH/ΔT DQ, -ΔQ, /ΔT DDQ, -Δ2Q, /ΔT2 However, ΔT is the operation time interval for opening and closing the gate valve, etc.

The amount of change obtained in this manner is supplied to the target discharge amount correction value calculation unit 18. Target discharge amount correction value calculation unit 1
8, the fuzzy inference unit 16 executes fuzzy inference regarding the predicted amount.

In this fuzzy inference, membership functions and rules that reflect the experience of experts are used. As a result of this inference, the target discharge amount correction value DQ.

is calculated.

This target discharge amount correction value DQo is calculated by the target discharge amount calculation unit 14
is supplied to The target discharge amount calculation unit 14 calculates Q −Q,
+DQ.

b 1 Target discharge amount Q based on the formula. Calculate b.

In other words, in the past, the inflow amount Q was used as the target discharge amount.
, was set, but in this embodiment, this target discharge amount is corrected by the target discharge amount correction value DQo, and the corrected target discharge amount ff1Qo is calculated.

The target discharge amount calculation unit 14 calculates the water level H and the corrected target discharge amount Q. b is supplied to the target opening calculation section 22. The target opening calculation unit 22 calculates the target opening P based on this information. b
is calculated and supplied to the opening/closing control section 24. Target opening degree P. ,
is a value indicating the target opening degree of gates, valves, etc. that discharge water from dams, weirs, etc. that are subject to water level control.

The opening/closing control unit 24 takes in the current opening degree P and monitoring information SV, and determines the target opening degree P. A gate valve opening/closing command signal is generated based on b. This signal is output to the machine side panel (not shown), and the gates, valves, etc. are set to the target opening P. b.

In this way, in this embodiment, the target opening degree P is calculated based on the fuzzy inference result in the fuzzy inference section 16.
ob is calculated, and the discharge from dams, weirs, etc. is controlled. As a result, water levels in dams, weirs, etc. can be controlled more precisely than ever before, ie, appropriately depending on the situation, by utilizing the experience of experts.

[Effects of the Invention] As explained above, according to the present invention, since the target discharge amount correction value is calculated by fuzzy reasoning, precise water level constant control that better matches the situation can be performed by utilizing the experience of experts. It becomes possible to do so.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a constant water level control device according to an embodiment of the present invention. 10... Water level constant control device 12... Various quantity calculation section 14... Target discharge amount calculation section 16... Fuzzy reasoning section 18... Target discharge amount correction value calculation section 20...
Setting water level section 22...Target opening calculation section 24...Opening/closing control section Qo...Outflow amount Qob...Target outflow amount Ql...Inflow amount DH...Water level deviation DDE...Water level deviation Increase speed DQ, ... Inflow rate increase speed DDQ. Inflow rate increase acceleration DQ. Target discharge amount correction value Target opening degree

Claims (1)

[Scope of Claims] Various amount calculation unit that calculates the current inflow amount of a dam, weir, etc.; Target discharge amount calculation means that calculates a target discharge amount that is the amount of water to be released based on the inflow amount; Water level and inflow. A change amount calculation means that calculates the amount of change, etc. that indicates the change trend of water level and inflow amount based on the amount of water, and a target discharge amount correction value calculation unit that calculates the target discharge amount correction value by performing fuzzy inference on the change amount, etc. and a target discharge amount correction means for correcting the target discharge amount based on the target discharge amount correction value; a gate opening calculation section that calculates the gate opening according to the corrected target discharge amount; and a gate opening according to the gate opening. 1. A constant water level control device, comprising: an opening/closing control unit that opens and closes the water level of a dam, weir, etc. to maintain a constant water level, and performs fuzzy control of the water level.