JPS598020A - Gate controlling system - Google Patents

Abstract

PURPOSE:To avoid an error discharge and to improve both safety and reliability for automatic control of a gate, by checking previously whether the volume and level of reservoir water are in a range of allowable variation at a target opening amount. CONSTITUTION:A target opening amount TP is obtained by carrying out a process PAB with an opening amount A and a water level B. Then the level TH and volume TV of the reservoir water obtained with the amount TP are obtained from a process PTH or PTV. A gate is controlled with the amout TP only when both TH and TV are within a prescribed range epsilon.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention C relates to a gate control method, in particular, the water level,
The present invention relates to a gate control method suitable for calculating and controlling a target opening degree of a gate from an inflow amount.

Conventional gate control methods measure the gate opening and water level, calculate the final target opening from the deviation from the reference water level and the inflow, and set a timer (gate operating speed) that limits the amount of gate operation per time. When 2 seconds/Crn, one operation t′f
If t: 30 cm, set a 60 second timer and keep it within the set value of the gate overoperation prevention timer (a timer whose purpose is to prevent the control device from outputting gate opening/closing commands for more than 60 seconds in a row). The gate control was once completely stopped, and the gate control sequence was stopped completely at the final target opening, but even if there was an error in the process of calculating the target opening, the overoperation timer limit would still be applied. There was a drawback that the control was performed until the final target opening degree was controlled while calling.

In particular, for estuary weirs where the discharge amount is calculated from the downstream water level, upstream water level, and opening degree, even if the target discharge amount during control is small (the difference in water level between upstream and downstream is small), the target opening degree of the gate is large. Since the valve opening changed greatly from the current opening, it was not possible to determine whether the calculated target opening was an incorrect value or the correct value, causing operator anxiety.

An object of the present invention is to calculate f in a gate control method.
C. It is an object of the present invention to provide a gate control method that evaluates the validity of the final target opening degree and provides complete safety.

The present invention predicts how the water level and amount of water will change when the gate control is performed using the final target opening sound calculated by the gate control device, and the changed values are reflected over a predetermined period of time. , check the daily water level, water storage amount change, and whether it is within the allowable range. If it is outside the range, the gate control that is currently being executed will not be performed according to the calculated final target opening degree. This is a control system whose characteristic is to completely stop the control.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

Conventionally, in order to improve the reliability and safety of a control device, as shown in Fig. 1(a), the same human power A and Bk were used to perform exactly the same processing PAR on different devices P1 and Pwa. In the case of controlling only when the result Pl is obtained, and in the case of controlling only when the result Pl is obtained, and
) As shown in FIG.
However, in the present invention, as shown in Figure 2, processing PhBk is performed using inputs A and B, and the processing result TPkf is Then, another process PTH or PT v k is performed, and the processing result T H or I″iTV is within the range (ε
), control is performed using the initial processing result TPi as the target value TP for control. Note that the process PAN and the process Pr++ or Pry are processes performed by the same processing device P1.

FIG. 3 shows a general system configuration for gate control.

Processing equipment via protection device (2) and process input/output device (1)! (f+) is the gate opening degree (A), water level (
The opening/closing signal (PON) that controls up to the target opening degree CPI calculated based on Bl is output as the gate motor on/off signal (GONI) to the gate drive device (3), and the continuous time of the output signal is determined by the protection device (2). ) controls the gate (8) while monitoring it with an over-operation timer.

The present invention resides in a method for evaluating the validity of the target opening degree (Pl) determined by the processing device (Pl).

As shown in FIG.
Based on B), determine the processing (PAn)L and target opening degree (TP). The water level (TH) and water storage amount (TV) at the target opening (TP) are determined by processing (Pro, Ptv), and only when the values are within a predetermined range (g) can the target opening (TP) be reached. ) to control the gate.

FIG. 4 shows a specific example of a time chart of the present invention.

The control time (ΔT) to reach the target opening (TP) calculated from the current water level (NH) and the current opening (NP) is the gate operating time (1) and the gate resting time (1).
). Now, the inflow amount (Q,) is set to the target opening (TP).
) until the time (ΔT) to reach the current flow rate (NQ+
), TV-f (Qt Qo)dt+
NVT (a) TH=F(TV) TV: Water storage amount at target opening (TP) TH: Water storage level at target opening (TP) or TV': First gate operation (NT+ΔT estimated from after NT+tl) Later water storage amount TH': The water storage level after NT+ΔT estimated from the first gate operation (NT+tj), and the water storage amount at the target opening (TP) (TV, TV'
) and the water storage level (TH, TH' l) can be calculated.

←) formula calculates the storage volume (TVI) and water storage level (
The target opening degree (T
P) The first operation in the process of operating the gate up to (
Inflow amount (Ql) and discharge amount (Q, ) after Nl'-1-1)
The water storage amount (V') and water storage level (H') are calculated from the water storage amount (V') and water storage level (H'), and the water storage amount (TV') and water storage level (THM) at the target opening degree (TP) are calculated.Either is possible with the present invention. However, equation (b) shows that even if the time ΔT does not pass, the target opening degree (TP
) can be evaluated.

The amount of water stored after NT + ΔT time (TV) determined in this way.

TV') and the water storage level (TH, TH') are within the predetermined ranges of the upper limit (UV) and lower limit (LV+) of the water storage level, and the upper limit (UH) and lower limit (LH) of the water storage level; If it is within the range, it is assumed that the target opening (TP) is valid and the gate control is performed until the target opening (TP) is reached, and if it is outside the range like water storage 1 (TV'), the gate control is stopped. In addition, the amount of water stored (TV, TV')
and water storage level (TH.

If any one of the THMs is out of range, gate control will be stopped.

FIG. 5 shows the upper limit (UV, UH) and lower limit (LV) of water storage 1 (V), water storage level (■ ()) in hourly or -day units.

An example of an allowable width schedule table that predetermines LH) is shown below. This schedule, the target opening (TP), the water storage amount (TV, TV') obtained from 1, and the water storage level (TH).

By comparing and evaluating the target opening (TP)
The validity of this will be determined.

FIG. 6 shows a flowchart of the processing method (PAB), CPTH, PTV) of the present invention in the processing device (Pl) of FIG. 3. The solid line part and the broken line part of the process (Pr+v, Prv) correspond to the above-mentioned equations (a) and (b).

According to the embodiments of the present invention, there is an effect of improving the safety and reliability of automatic gate control.

According to the present invention, even if an incorrect opening occurs in calculating the target opening H1'' of the gate, the present invention can prevent erroneous control in advance.

The present invention makes it possible to determine in advance whether or not the amount of water stored and the water level at the target opening determined in the automatic control of the gate are within a predetermined allowable range of change. Abnormal discharge (erroneous discharge) even when temperatures occur
It is possible to prevent this and improve the safety and reliability of gate control.

[Brief explanation of drawings]

FIG. 1 shows a conventional method for improving the safety and reliability of a control device. FIG. 2 shows the method adopted in the present invention to improve the safety and reliability of gate control. FIG. 3 shows the gate control system configuration. FIG. 4 is a time chart showing the amount of water stored and changes in the water level when the gate is controlled to the target opening, assuming that the inflow is constant. FIG. 5 shows a schedule of permissible changes in water storage amount and water level on an hourly and daily basis. FIG. 6 illustrates the invention in a flow chart. A, A', B, B'...input data, Pt
, P2...Processing device, PAN, PA'l'...Processing, P, P'...Output data, ε...Tolerance width, TP
...Output data of one processing unit, PTll.

Claims (1)

[Claims] 1. In a method of controlling the gate by calculating the target value of the gate opening based on the water level and inflow value, when the gate is controlled to the target opening value before operating to the calculated target opening value. The water storage level and water storage amountKaneko side calculates the deviation of the predicted value from the water storage level or water storage amount value determined from the preset water storage level or water storage amount pattern, and calculates the deviation value from the preset water storage level or water storage amount pattern. A gate control method characterized in that the gate is controlled to the calculated target opening degree when the opening degree is within a set range.