JPH0757942B2 - Water level control device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water level constant control device for maintaining a constant water level of a dam, a weir, etc., and particularly to improvement of means for correcting a target discharge amount.

[Prior Art] Conventionally, there is known a water level constant control device for maintaining a constant water level of a dam, a weir, and the like. This device is a device that calculates a target discharge amount according to the current water level and the like and controls the water level by opening and closing a gate.

Further, as a method of calculating the target discharge amount, a water level deviation method and an inflow 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 discharge is executed.

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

[Problems to be Solved by the Invention] However, conventionally, there have been the following problems in the calculation of the target discharge amount.

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

In addition, in the inflow control method, a delay time occurs in the inflow calculation, and this also causes the delay control.

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

In order to avoid such delay control and eliminate inaccuracies in the inflow amount calculation and the like, an appropriate correction may be added to the target discharge amount calculated by the inflow amount control method. Conventionally, a device that tried such a correction was also known, but since this device can only execute a correction calculation method set in advance by a program, the amount of inflow to a dam, a weir, etc., the current water level, etc. It is not possible to make flexible corrections according to real situations.

Thus, in the past, it was difficult to keep the water level accurately and constant.

The present invention has been made to solve such a problem, and makes it possible to perform more accurate water level control by faithfully reflecting the experience of a skilled person in the target discharge correction value. An object is to provide a constant water level control device.

[Means for Solving the Problems] In order to achieve such an object, the present invention provides various quantity calculation units for calculating the current inflow amount of dams, weirs, etc., and an amount of water to be discharged based on the inflow amount. A target discharge calculation means for calculating a certain target discharge, a change quantity calculation means for calculating a change quantity indicating a change trend of the water level and the inflow quantity based on the water level and the inflow quantity, and performing fuzzy inference on the change quantity, etc. A target discharge correction value calculation unit for calculating a target discharge correction value by
Target discharge amount correction means for correcting the target discharge amount based on the target discharge amount correction value, a gate opening amount calculation unit for calculating the gate opening amount according to the corrected target discharge amount, and opening / closing of the gate according to the gate opening amount. In addition, an opening / closing control unit for controlling the water level of the dam, the weir, etc. at a constant level is provided, and the water level is fuzzy controlled.

[Operation] In the constant water level control device of the present invention, first, the current inflow amount into the dam weir or the like is calculated by the various amount calculation unit, and the target discharge amount is calculated based on the calculated inflow amount. Further, the amount of change and the like are calculated based on the inflow amount and the water level. The amount of change, etc. is an amount indicating the change trend of the water level and the inflow amount, and corresponds to, for example, the water level deviation, the water level deviation increasing speed, the inflow increasing speed, the inflow increasing acceleration, or the like.

On the other hand, the target discharge correction value calculation unit performs fuzzy inference on the amount of change and the like to calculate the target discharge correction value. This target discharge amount correction value is used for correction of the target discharge amount in the target discharge amount correcting means.

The target discharge flow rate thus corrected is used for calculating the gate opening. That is, the gate opening is calculated according to the corrected target discharge amount, and the opening / closing of the gate is controlled according to the gate opening.

As a result, the water level of dams, weirs, etc. will be kept constant. At this time, the experience of the expert can be reflected in the membership functions and rules of fuzzy reasoning, and flexible water level control according to the situation can be performed.

[Embodiment] A preferred embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a constant water level control device according to an embodiment of the present invention.
Ten configurations are shown.

The constant water level control device 10 shown in this figure includes various amount calculation units 12
A target discharge calculation unit 14, a target discharge correction value calculation unit 18 including a fuzzy inference unit 16, a set water level unit 20, a target opening calculation unit 22, and an opening / closing control unit 24. There is.

Next, the operation of this embodiment will be described.

The various quantity calculation unit 12 inputs the water level H from the water level gauge, the opening degree P from the opening degree meter, and the monitoring information SV from the machine side panel, calculates the discharge amount Q _0, and calculates the water level H and the calculated value. The inflow amount Q _i is calculated based on the discharge amount Q ₀ . Alternatively, the degree of opening P is changed to the discharge amount Q ₀ , and the same calculation is performed.

The target discharge amount calculation unit 14 sets the inflow amount Q _i calculated by the amount calculation unit 12 as the target discharge amount before correction, and further sets the water level H and the inflow amount Q _i supplied from the amount calculation unit 12. The amount of change or the like is calculated based on the set water level H _s supplied from the water level unit 20.

In this embodiment, the amounts adopted as the amount of change are the water level deviation DH, the water level deviation increasing speed DDH, and the inflow quantity increasing speed DQ _i.
And the inflow increase acceleration DDQ _i . These amounts are calculated based on the following formula.

_{DH = H-H s DDH =} ΔH / ΔT DQ i = ΔQ i / ΔT DDQ i = Δ 2 Q i / ΔT 2 where, [Delta] T is a gate, is an operation time interval for opening and closing the valves.

The amount of change obtained in this way is supplied to the target discharge correction value calculating unit 18. In the target discharge correction value calculation unit 18, the fuzzy inference unit 16 executes fuzzy inference about the predicted amount.

In this fuzzy reasoning, membership functions and rules that reflect the experience of experts are used. As a result of this inference, the target discharge correction value DQ ₀ is calculated.

The target discharge flow rate correction value DQ ₀ is supplied to the target discharge flow rate calculation unit 14. The target discharge flow rate calculation unit 14 calculates the target discharge flow rate Q _0b based on the equation of Q _0b = Q _i DQ ₀ .

That is, conventionally, the inflow amount Q is set as the target discharge amount.
_{Although i} was set, in this embodiment, the target discharge correction value
The target discharge amount is corrected by DQ ₀ , and the corrected target discharge amount Q _0b is calculated.

The target discharge calculation unit 14 supplies the water level H and the corrected target discharge Q _0b to the target opening calculation unit 22. Target opening calculator
22 calculates the target opening P _0b based on these information,
It is supplied to the opening / closing control unit 24. The target opening degree P _0b is a value indicating the target opening degree of the dam, the gate, the valve, and the like that discharges water from the dam, the weir, or the like that is the target of water level control.

The opening / closing control unit 24 takes in the current opening P and the monitoring information SV, and generates a gate valve opening / closing command signal based on the target opening P _0b . This signal is output to the machine side panel (not shown), and the gate, valve, etc. are set to the target opening P _0b .

Thus, in this embodiment, the fuzzy inference unit is
Based on the result of fuzzy reasoning in 16, the target opening P _0b
Is calculated and the discharge from the dam, weir, etc. is controlled. As a result, the water levels of dams, weirs, etc. will be controlled more accurately than before, that is, appropriately controlled according to the situation, by utilizing the experience of skilled persons.

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

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a water level constant control device according to an embodiment of the present invention. 10 …… Constant water level control device 12 …… Various volume calculation unit 14 …… Target discharge calculation unit 16 …… Fuzzy inference unit 18 …… Target discharge correction value calculation unit 20 …… Set water level unit 22 …… Target opening Calculation unit 24 …… Opening / closing control unit Q ₀ …… Discharge rate Q _0b …… Target discharge rate Q _i …… Inflow rate DH …… Water level deviation DDH …… Water level deviation increase rate DQ _i …… Inflow rate increase rate DDQ _i … … Inflow increase acceleration DQ ₀ …… Target discharge flow correction value P _0b …… Target opening

Claims (1)

[Claims] 1. A quantity calculation unit for calculating a current inflow amount of a dam, a weir, etc., a target discharge amount calculation means for calculating a target discharge amount which is a water amount to be discharged based on the inflow amount, and a water level and an inflow amount. A change amount calculation means for calculating a change amount indicating the change trend of the water level and the inflow amount, and a target discharge correction value calculation part for calculating a target discharge correction value by performing fuzzy inference on the change amount , A target discharge amount correction means for correcting the target discharge amount by the target discharge amount correction value, a gate opening degree calculation unit for calculating the gate opening amount according to the corrected target discharge amount, and a gate according to the gate opening amount. A constant water level control device, comprising: an opening / closing control unit that opens and closes to control the water level of a dam, a weir, etc. constantly, and performs fuzzy control of the water level.