SU1298303A1 - System for regulating flows in portions of canal with head pumping station - Google Patents

Description

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The invention relates to agriculture and can be used to automate water distribution in open canals.

The purpose of the invention is to increase the reliability of the system by increasing the speed of working out changes in consumer costs by changing the pumping station cost.

Fig, 1 shows the functional

The diagram of the system in FIG. 2 is a diagram of a head pumping station with a control unit; FIG. 3 is a diagram of the controller j in FIG. 4, a diagram of a pulse-width modulator; Fig. 5 is a diagram of signals at the output of a pulse width modulator (PWM) installed in the controller block.

The system comprises a head pump station 1, a partition 2, a control unit 3, a flow meter 4, a first level 5 sensor, a consumer flow sensor 6, a second level sensor 7 J gate 8, a regulator 9, a reference element 10, an adder 11, a threshold block 12 , comparison unit 13, matching unit 14, threshold element 15,

The control unit 3 is connected to the input of the pumping station 1, the output of which is connected to the input of the flow meter 4, the output of the latter is connected to the first input of the comparison unit 13, the second input of which is connected to the output of the adder 11 of the first channel section. The output of the comparison unit I3 is connected to the first input of the control unit 3 via the threshold element 15. The second input of the control unit 3 is connected to the output of the second level sensor 7 of the first channel section through the threshold unit 12. The first input of the regulator 9 is connected to the output of the first level sensor 5 through the element 10, the second input of which is connected via an adder 11 to an output of a consumer consumption sensor 6, the second input of an adder 11 being connected to the output of an adder 11 of a subsequent channel section. The second input of the regulator, 9 is connected to the output of the second sensor 7 of the level of the subsequent channel section. The third input of the regulator 9 is connected to the output of the adder 11 of the subsequent section of the channel through the matching unit 14, the output of the regulator 9 is connected to the gate 8,

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Pump station 1 consists of units 16 (FIG. 2), Control unit 3 consists of normally-open keys 17, normally-closed keys 18, delay elements 19 and logic circuits And 20,

The regulator 9 contains an adder 21, a pulse-width modulator 22, an executive unit 23 (FIG. 3), a Pulse-width modulator consists of a module allocation module 24, a sawtooth generator 25, a comparator 26, a relay element 27 and shaper 28 control pulses (figure 4),

The system works as follows

In the initial state, the flow rate supplied to the channel and disassembled by consumers is balanced and the system is operating stably. At the same time, the water levels in the channel sections are kept constant. When the consumption of the plot consumers changes, for example, an increase in the consumption of consumers before the second and third partitioning structures 2, the signals of the respective sensors 6 and 7 appear, which leads to the operation of the regulators 9 and the change in the flow to the channel sections. The inputs of the regulator 9. The second partitioning structure 2 signals from the output of the sensor 7 level of the third partitioning structure 2 and from the output of the sensor 6 flow of the consumer of the third partition structure 2 through a series-connected adder 11 and matching unit 14, In addition, to the third input of the specified control the torus receives a signal from the output of the element 10 comparing the second partitioning structure 2, the Controller 9 of the second partitioning structure 5 and 2 produces a gate control signal 8 corresponding to construction applications of the partition 2, the shutter opening 8 of the partition size estate 2 depends on the costs and water levels in the second and third sections.

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The algorithm by which the -controller 9 generates the control signal can 55 be represented as follows:

, /

H, cajU c

 +

S,; yn

Ki + 1

Where

c.i

yi

q; 9Ci

JO

ynk ,,.

and .. is the control signal of the controller, i-ro of the channel section;

the proportionality coefficients of the i-ro channel; the output signal of the corresponding matching unit 14 i-ro channel section; - the signal from the output of the element 10 of the comparison of the i-ro section of the channel;

the signal from the output of the sensor 7 level at the end of the (i + l) -ro portion of the channel;

2.5

;.,. п; п - total number of channel sections.

The coefficients C,, C, are determined by the characteristics of the channel section, for example, depth, length, width, etc.

The control signal arrives simultaneously at the input of the module 24 of the module’s lane and at the input of the relay element 27 (Fig. 4). The signal from the generator 25 of the sawtooth voltage is fed to the second input of com-25 parator 26. The first input of the control pulse generator 28 receives a signal from the output of the comparator 26, and the second input to the DOR is the output signal e of the relay element 27,

At the output of the driver 28, control pulses are obtained from the post-reflecting structure 2, which depends not only on the water levels and flow rates of the respective sections, but also on the total consumption of consumers of all the lower sections.

If the difference between the total consumption of consumers and the flow rate supplied by the pump station 1 does not exceed the threshold value K of the threshold block 15 by the value, a signal appears at the output of the threshold block 15 that turns on the normally open switch 17 of the control block 3, JP as a result The next additional unit 16 of the pumping station 1 is turned on. In this case, the flow rate supplied to the channel changes in steps to the value of the unit flow 16. If the signal from the output of the comparison element 13 exceeds the threshold value K by the value of 2 9, then the signal from the output of the threshold unit 15 includes two normally-open keys of the control unit 3, As a result, two successive units of the pumping station 1 are activated. In this case, the flow rate changes units flow rate supplied to the channel. Similarly, if the input signal of the comparison element 13 exceeds the threshold value K by the value of T, then the output signal of the porotry is constant, the duration and sign of each of them depends on the module and the sign of the signals.

of the bobbin block 15 includes the normally open keys of the block 3, the control of the pulses, the amplitude of which is 35

alternate C units of the pumping station 1. In this case, stepwise change on the value of the unit consumption. As the water level changes the flow rate to the canal, In addition, in the canal sections, directly draining units of the pumping station hang from the consumption expenses, they do not work until the comparison element 10 is filled with the signals from the output of the level 5 sensor and the signals from the output of the adder 11 are compared taking into account the coefficient of correspondence between the consumption of the consumers and the water levels.

Similarly, the regulator 9 of the first blocking structure 2

the reserve volumes of all the below blocking structures 2, Since the reserve volume is significant, the number of operations of additional units of the pumping station 1 decreases sharply, which increases the reliability of the pumping station 1. I

The control signals for the shutter 8 of the corresponding partitioning structure 2, the magnitude of the opening of the shutter B of said barrier structure 2 depends on the total consumption of the second and third sections and on the water levels at the end of the second and the beginning of the first sections. Thus, the magnitude of the opening of the shutter 8 of each re

The building 2 depends not only on the water levels and expenditures of the respective sections, but also on the total expenses of the consumers of all the lower sections.

If the difference between the total consumer flow and the flow rate supplied by the pump station 1 does not exceed the threshold value K of the threshold block 15 by the value, the output of the threshold block 15 is a signal that turns on the normally open switch 17 of the control block 3, JP results in the next auxiliary unit 16 of the pumping station 1. In this case, the flow rate supplied to the channel changes in steps to the flow rate of the unit 16. If the signal from the output of the comparison element 13 exceeds the threshold value K by the value of 2 9, then the signal from the output of the threshold unit 15 includes two normally-open keys of the control unit 3, As a result, two successive units of the pumping station 1 are activated. In this case, the flow rate changes units flow rate supplied to the channel. Similarly, if the input signal of the comparison element 13 exceeds the threshold value K by the value of Г, then the output signal of the threshold unit 15 includes the normally open keys of the control unit 3 and, as a result,

successive C of pumping station units 1. In this case, the flow rate supplied to the channel changes in steps to the amount of consumption of the units. The additional units of the pump station work until the pump

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The reserve volumes of all the below blocking structures 2, Since the reserve volume is significant, the number of operations is additional From the units of the pumping station 1. In this case, the flow rate to the channel changes in steps to the value of the units, the additional units of the pumping station are working until fill in re-

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pumping station 1 units are dramatically reduced, which increases the reliability of the pump station 1. I

If, as a result of switching on the additional units 16, the water level at the end of the first section of the channel reaches the maximum permissible level, then a signal appears from the output of the threshold element 12 that turns off the normally-closed key 18 of the control unit 3, as a result of which the next additional unit 16 turns off pumping station 1. If through

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the time r at the output of the threshold element 12 there is still a signal, then another normal-closed switch 8 of the control unit 3 is turned off. The next additional unit 16 of the pump station is turned off. Similarly, if, after time dr, the signal at the output of the threshold element 12 still exists The normally closed d-1 switch 18 of the control unit 3 is turned off. As a result, the d-1 unit 16 of the pumping station 1 is turned off to prevent the channel dams from overflowing.

Thus, in the system, the number of connected pumping units depends on the total costs of all sections of the channel. In addition, the size of the shutter 8 of each partition 2 depends not only on the levels and flow rates of the corresponding section, but also on the total consumption of all consumers.

downstream areas, which allows to increase the speed of controlling the flow and level of water in the canal.

Simplification of the system is achieved by the fact that it does not use lines of communication connecting the outlines of block 13 comparison with regulators 9, and logical elements AND, Since the irrigation main channel has a large length and many sections, the absence of the specified communication line and logical elements and provides additional cost savings.

Thus, the proposed system allows to increase the speed of controlling the flow rates and water levels in the canal and increase the reliability of the pump station by reducing the number of responses of pump units by maximizing the use of reserve volumes in the canal.

Tb

Editor N. Bobkova

Compiled by G.Paraev Tehred N.Glushchenko

Order 867/29 Circulation 607. Subscription VNIIPI USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushsk nab ,, d.4 / 5

Production and printing company, Uzhgorod, Projecto st., 4

Korrektor.I.Muska

Claims (1)

COST CONTROL SYSTEM AT CHANNEL SITES WITH HEAD PUMPING STATION, containing a control unit connected to the input of the pumping station, at the output of which there is a flow meter, a first level sensor, a consumer flow sensor, a second level sensor, and a blocking structure with a gate connected to the output of the controller, the first input of which is connected through the element of comparison * * to the first level sensor, and the second input of the comparison element is connected via the sum OR with a consumer flow sensor, the second input of the adder is connected to the output of the adder of the subsequent channel section, and the second input of the controller is connected to the output of the second level sensor of the next channel section, as well as a comparison unit installed on the first channel section, the first input of which is connected to the output of the flow meter installed at the pumping station, and the second input with the adder output, and a threshold unit connected between the second level sensor and the control unit, distinguishing me in that, in order to increase the reliability of the systems s by increasing the speed of processing changes in consumer costs by changing the flow rate of the pumping station, the system is equipped with matching units in the channel sections included between the outputs of the adders of the subsequent channel sections and the third controller input in this channel section, and a threshold element installed in the first channel section connected between the block output comparison and the second input of the control unit. N0 ς © 00 00 oo 1 1298303