SU1518448A1 - System controlling water supply in canal with damming structures and head pumping stations - Google Patents

Abstract

The invention relates to agriculture and can be used to automate water distribution in irrigation canals. The purpose of the invention is to increase the operational reliability and efficiency of the system. The water supply control system in the channel includes on each section of the channel blocks 8–10 of setting the settings, respectively, of the normal, maximum and minimum levels, the corresponding units 5–7 of the corresponding blocks, block 11 of logic connected to the keys 14 and 15 of the maximum and minimum levels with zero the organs 12 and 13, and a control unit 16 for controlling the actuator 17 of the shutter 18 at the beginning of the section. The system also contains lines of communication from the transmitting units 22, 23 at the end of the channel, which through the groups of closing and opening contacts of the keys 14 and 15 at each site and the receiver 21 of the signals at the beginning of the channel, are connected to the unit control unit 20 by a pump of the station to which block 19 for measuring the speed of the level deviation in the first section. The monitoring of water levels in the plots is carried out by sensors of 4 levels. The operation of the system is that a disturbance that occurs in an arbitrary section of the channel in the form of a change in the water level in it, as a result of a change in the consumption of its consumers, is transmitted towards the terminal 3 section of the channel, and then sequentially, using the reserve volumes of each channel section, from the terminal plot to the head. In this case, a stepwise change in the flow rate in the head section of the channel is performed with a force according to the rate of change of the water level in the head section of the channel, and the force is removed after a predetermined level in the channel is established. 1 il.

Description

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controlling the actuator 17 of the gate 18 at the beginning of the section, the System also contains lines of communication from the transmitting units 22 and 23 at the end of the channel, which through the groups of closing and opening contacts of the keys 14 and 15 at each section and the receiver 21-signals at the beginning of the channel connected to the unit 20 control unit of the pumping station, to which the block 19 measuring the speed of the level deviation in the first section is connected. Monitoring the water levels in the sections is carried out by sensors of 4 levels. The operation of the system is that The perturbation in the form of a change in the water level in it as a result of a change in the flow rate of its consumers is transmitted towards the end section 3 of the channel, and then successively, using the reserve volumes of each channel section, from the end section to the head section. the channel section is made with a forcing according to the rate of change of the water level in the head section of the channel, and the force forcing is performed after the preset level in the channel is 1 and

The invention relates to agriculture and can be used in the automation of technological processes in hydromeliorative systems for water distribution in irrigation canals.

The aim of the invention is to increase the operational reliability and efficiency of the system.

The drawing shows a block diagram of a water supply control system in a channel with blocking structures and a head pumping station.

The control system includes control at the head 1, intermediate 2 and end 3 sections of the canal. The head section of the irrigation canal is bounded from above by the head pump station, and from the bottom by the blocking structure. The intermediate section 2 of the channel is bounded above and below by the blocking structures. water levels, which are connected to the first inputs of elements 5,6 and 7 comparing normal, maximum and minimum levels, the second inputs of which are connected to the corresponding blocks 8, 9 and 10 of the settings for the regulation of the normal, maximum and minimum levels. The outputs of the comparison elements 5 are connected to the inputs of the logic blocks 11, and the outputs of the comparison elements 6 and 7 to the zero-organs 12 and 13 of the maximum and minimum levels O Through the breaking contacts 14, and 15 keys 14 and 15 maximum and minimum levels

or the corresponding closing contact 14 "i or 15ii of the key 14 or 15 output element 5.6 or 7 of the comparison is connected to the input of the regulating unit 16, which second acts on the actuator 17 of the shutter 18 of the partition structure. The first inputs of the keys 14 and 15 are connected to the outputs of the zero-bodies 12 and 13, and the second inputs - with the output of the logic block 11

The water level sensor 4 of the head section 1 of the channel is connected via the unit 19 for measuring the speed of the water level deviation to the first input of the unit 20 control unit of the pumping station. The second input of the control unit 20 is connected to the output of the receiver 21 of the control object state signals from the transmitting unit 22 or 23 via contacts 14j, 15 or 14 / (, keys 14 and 15

A characteristic feature of irrigation canals with machine water intake as control objects is the presence of disturbed water movement in them due to the mismatch between the staged water supply and discrete-continuous water consumption. As a rule, the iCyMMapHoro water consumption in the head pump station usually changes a constant movement of water levels in one direction is observed. The maximum effect when controlling a canal with a machine intake is achieved by maximizing the use of reserve tanks of all

exact and final sections of the channel and maintaining the optimum pressure of the pumping units. This allows minimizing the number of switching units of the pumping units, ensuring their maximum. KPD and energy savings in water supply. In this case, it is expedient to apply a constant (hard) water distribution control algorithm, which is implemented using simple and reliable means of automatic control and regulation of water levels. The simplicity and reliability of such control is achieved by the fact that it clearly defines the order of transmission of disturbances and the use of reserves of the sections of the channel.

In fact, the transmission of disturbances from top to bottom is justified in the described system by the fact that the channel sections have the properties of integrators, and therefore, during the transmission of disturbances, their algebraic summation occurs, the Tooo disturbances of the same sign are added, and different signs are subtracted.

Flow forcing is mainly used as a control for returning the control object to its original state after maximizing the use of reserve channel capacities, such as forcing the flow is a necessary operation for implementing water distribution on machine-controlled water channels.

Thus, in general, the operation of the water supply control system in the canal with the blocking structures and the main pumping station can be represented as follows. By means of the pumping station, water is supplied to the head section of the channel, and to the underlying water it flows by gravity by means of regulating shutters of the blocking structures, B In case of equality of costs (supplied by the head pumping station and drained from the canal by water bearers), a steady state of motion is observed in the canal, characterized by stability water levels in all its gauges. At the same time, the water level in the canape should provide the required outflow costs and optimal operating conditions for pumping stations or pumping stations to

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water channel sections of the channel.

When the consumption of water consumers changes, the water levels in the canal change. Stabilize the water levels in the canal sections with the help of regulating gates of partitioning structures located in their

lower boundaries, the water supply control system transmits disturbing influences (disbalance costs) down to the end of the channel. Broadcast

A disturbance to the end portion of the channel leads to a change in the water levels in the yen in the direction determined by the disturbance sign. After increasing or decreasing the level of water in the end

The canal section to a predetermined maximum or minimum value, after maximizing the accumulation or activating its reserve capacity, the automation units of the end section stabilize the specified limiting water level in the end section of the channel by moving the barrier of the overlapping structure at the upper boundary of the coyc section of the channel. Behind

the expense of this comes through. transmission of disturbance in the opposite direction, causing a change in the water level in the above-located part of the channel, and, therefore, accumulation or operation of its reserve volume. After increasing or decreasing the water level in the intermediate section of the channel to a predetermined limit value, indicating the maximum use of the reserve capacity of this channel section, the system switches the automation units to stabilize the maximum maximum or minimum water level in it by means of the alternating crossing.

So, successively accumulating or triggering reserve capacities of all subsequent intermediate sections of the channel, a disturbing effect is transmitted to the head section of the channel, where the water level changes with a speed proportional to the unbalance flow rate. After determining the travel speed of the water levels and using the reserve tank in the head section, the next pump unit is turned off or on. The magnitude of the change in the pumping mill supply is chosen 1.2-1.5 times greater than the calculated one in order to compensate for the preceding disturbing effect and change the course of the water levels back to a predetermined zone. Initially, the water levels in the head section of the channel change in the direction of optimal value. After reaching a predetermined level of water in the head section, the hydro-automatic valve is switched to its stabilization by means of a control gate of the partitioning structure. Due to this, the flow rate in the downstream section of the channel and the return of the levels in it towards the specified normal value occur. When the channel reaches a predetermined level in the intermediate section of the channel, it is stabilized using a control gate of the lower part of its structure, and consequently, the transfer of additional flow to the lower section of the channel.

Similarly, the return of water levels to the optimum value is also carried out in other lower parts of the canal.

The moment of removal of the flow rate forming unit by the pump station is determined taking into account the inertia value and the transport lag of the control object, so that after removing the boost, the water level in the end section of the channel is as close as possible to the normal (average) value

The system works as follows.

In the stabilization mode, the levels of the upper loops of the blocking structures, i.e., the transmission of disturbances from top to bottom, contacts 14 and 15.J, the keys of 14 maximum and 15 minimum levels are closed. In this case, the control unit 16 perceives the error signal from the element 5 of the comparison. When the balance of water supply and water consumption in sections 1 and 2 of the channel, the signals coming from the sensors 4 water levels are balanced by the signals of the settings block 8 and the outputs elements 5 comparison mismatch signals are missing,

The occurrence of a disturbing effect on the section 1 of the channel leads

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to a deviation of the water level, a change in the signal at the output of the sensor 4 and the occurrence of the error signal at the output of the element 5 comparing the normal level. The control unit 16 by means of the actuator 17 and the shutter 18 of the barrier structure produces a stabilizing effect on the object (section 1 of the channel). As a result, the water level in the upstream of the blocking structure is stabilized, and the disturbing effect that caused the deviation of the water levels in section 1 of the channel is transmitted to the intermediate section 2 of the channel.

After the transport lag time of the flow to the end of the channel section, the water level deviates from the sensor 4 level of section 2 from the value given by block 8. At the output of the normal level comparison element 5, the error signal arrives at the input of the regulating unit 16 at the lower boundary of the section 2 channels. The regulating unit 16 forms a control action stabilizing the water level in the upper pool of the blocking structure, and transmits the compensation effect to the end section 3 canals la, in which, depending on the sign of the disturbance, an increase or decrease in the water level occurs. When the water level in the end section 3 of the channel changes to the maximum setpoint specified by block 9 or the minimum setpoint O setpoint, a zero error signal appears at the output of the maximum comparison element 6 or at the output of minimum level comparison element 7, which leads to a zero-body response maximum I2 or minimum 13 level and a key 14 or 15 o Contact 14 (or 15/1) of key 14 (or 15) opens, and contact 14 ij (or 15 (j) closes) The device switches from the stabilization mode of a given level The upper reach for adjusting the specified maximum (or minimum) water level in the end section 3 of the channel. This returns the signal back to the intermediate section 2 of the channel, where the water level changes towards the maximum or minimum value.

When the water level at the end of section 2 of the channel reaches one of the maximum and 10 minimum limits set by blocks 9, the zero signal appears at the output from element 6 (or 7) comparing the maximum (or minimum) level, leading to the zero-organ 12 (or 13) and key 14 (or 15) Contact 14i 10 (or 15) disconnects the input of the regulating unit 16 from the element. 5 is a comparison, and pin 14rj or 15 5 connects the input of the regulating unit 16 to the output

neither from the output of the comparison element 5 is fed to the input of the logic block 11. The latter analyzes the incoming error signal and, in the case of decreasing its magnitude (at the time of the appearance of the zero signal at the output of the comparison element 5), generates a signal that arrives at the second inputs of the keys 14 of the maximum and 15 levels and sets them to their initial state. state 14., 5, lAj, 5c, keys 14 and 15 are closed, and contacts

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element 6 or 7 comparison. This ensures that the 15 15, 143, 153 are open. Thus, the regulation of a given limit level is made at the end of the section. channel and transfer of disturbance to the head section of channel 1

The disturbance transmitted to the head section 1 of the channel leads to a change in the level of water in it with a speed determined by the value of the disturbance and in a direction depending on its sign: kao. The signal proportional to the rate of change of water level in the head section 1 of the channel water using the unit 19 measuring the speed of the level deviation arrives at the first input of the pump control unit 20, the second input of which with the help of the transmitting unit 22, the closed contacts 14, or 15 and the signal receiver 21 receives a signal Due to the maximum accumulation or operation of the reserve tanks of the intermediate 2 and end 3 sections of the channel. According to the signal of the unit 19 for measuring the rate of change of water level in the head section 1 of the channel and with maximum use of the reserve tanks of the entire channel, the unit 20 controlling the pumping units performs selection and deactivation (switching on ) of the next pump unit with given force.

The forced change in the pumping station supply compensates for the previous disturbance and the appearance of a new disturbance of the return sign. As a result, the direction of change in the water level in the channel 1 section changes and approaches them to the specified normal value. At this, the error signal at the output of the element 5 comparing the normal level decreases, approaching zero. Disagree signal35

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Thus, the device at the lower boundary of the section 1 of the channel switches to the regulation of the water level in the upstream of the blocking structure, t, it returns to the initial state.

A further deviation of the water level in the channel section 1 results in the occurrence of a mismatch signal at the output of the comparison element 5, the response of the regulating unit 16 and the transmission of the disturbance to the channel section 2. This leads to the return of water levels in section 2 of the channel to a normal value and a decrease in the error signal at the output of the comparison element 5 at the lower boundary of the channel section. When a zero signal appears at the input of the comparison element 5, logic block 11 causes the reset signal to be reset. keys 14 and 15, wherein the contacts 141, 15i, 14, 5 of the keys are closed, and the contacts 145, З, 14о ,, 15з are opened. The device switches to upstream level control by blocking its structure. and transmits the disturbance to the end section 3 of the channel.

Since the contacts 14 and 154 of the keys 14 and 15 on all the blocking structures are closed, the receiver 21 receives a signal from the block 23, indicating that the water levels in the head and intermediate sections of the channel have returned to the initial state and the forced feed of the pump station the flow rate can be removed. In this case, the pump control unit 20 generates a signal for the removal of the flow rate forcing,

After the force is removed due to the inertia and transport delay of the control object, the water level in the section 3 of the canape from the output of the comparison element 5 is fed to the input of the logic unit 11. The latter analyzes the incoming error signal and, in the case of decreasing its magnitude (at the time of the appearance of the zero signal at the output of the comparison element 5), generates a signal arriving at the second inputs of the keys 14 of the maximum and 15 minimum levels and setting them to their initial state. state 14., 5, lAj, 5c, keys 14 and 15 are closed, and contacts

1 15e, 14h, 15h open, So

Thus, the device at the lower boundary of the section 1 of the channel switches to the regulation of the water level in the upstream of the blocking structure, t, it returns to the initial state.

A further deviation of the water level in the channel section 1 results in the occurrence of a mismatch signal at the output of the comparison element 5, the response of the regulating unit 16 and the transmission of the disturbance to the channel section 2. This leads to the return of water levels in section 2 of the channel to a normal value and a decrease in the error signal at the output of the comparison element 5 at the lower boundary of the channel section. When a zero signal appears at the input of the comparison element 5, logic block 11 causes the reset signal to be reset. keys 14 and 15, wherein the contacts 141, 15i, 14, 5 of the keys are closed, and the contacts 145, З, 14о ,, 15з are opened. The device switches to upstream level control by blocking its structure. and transmits the disturbance to the end section 3 of the channel.

Since the contacts 14 and 154 of the keys 14 and 15 on all the blocking structures are closed, the receiver 21 receives a signal from the block 23, indicating that the water levels in the head and intermediate sections of the channel have returned to the initial state and the forced feed of the pump station The flow rate can be removed. In this case, the control unit 20 on the pine-tree aggregates generates a signal to remove the flow rate forcing,

After removing the force due to the presence of inertia and transport delay of the control object, the water level in section 3 of the canapes is 5, 5

should be close to normal

At this, the operation cycle of the device is terminated. When a new disturbing effect occurs, its operation is repeated.

Due to the maximum use of reserve capacities of the irrigation canal, the number of actuations of pumping units decreases, their service life increases, the standby capacity of the head canal decreases, which results in a significant reduction in the cost of its construction, saving energy, reducing the cost of water supply.

Claims (1)

Claim 20 - The water supply control system in the channel with the blocking structures and the head pumping station, including the units of the normal, maximum and minimum levels installed on all parts of the channel except the first, setting the normal, maximum and minimum levels, respectively, of the first, which are connected to the level sensor at the end of the previous section, and the other two to the level sensor at the end of this channel section, the regulating unit with an actuator connected to it m drive septum constructions in the beginning portion, the input of which through the break contacts of keys of the maximum and minimum levels, coupled with the output element Editor and Rybchenko Compiled by G.Parayev Tehred L. Serdyukova Order 6574/34 Circulation 589 VNISh of the State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab, d. 4/5 ten 15 20 844812 the normal level, and through the closing contacts of the keys of the maximum and minimum levels - with the outputs of the comparison elements of the maximum and minimum levels, and the unit control unit of the pumping station installed in the first section, the first communication line with sequentially installed pairs of closing contacts of the keys of the maximum and minimum levels about the fact that, in order to increase operational reliability and cost-effectiveness, the system is equipped on each section of the channel, except the first, to two zero l-bodies of maximum and minimum levels at the ends of sections, the inputs of which are connected to the outputs of the respective comparison elements by the second line of communication with the series-connected disconnecting contacts of the keys of the maximum and minimum levels, the receiver of signals, the logic block, whose input is connected to the output of the comparison element of the normal level, and the output is to the inputs of the keys of the maximum and minimum levels set in the first section by the unit for measuring the speed of deviation of the water level of this section, the entrance cat cerned is connected to a water level sensor at the end of the first portion, and an output - to aggregates pump station control unit, and the two transmission units, installed at the end of the channel, through which telecommunication lines and signal receiver are connected to the input of the control unit aggregates pumping station 25 thirty 35 40 Proofreader L, Beek id Subscription