SU1363148A1 - System for regulating water distribution in canal with partition structures - Google Patents

Abstract

This invention relates to a technique for automating water distribution in irrigation. The purpose of the invention is to increase the reliability and stability of the system and reduce its cost. For this, the water distribution control system on the channel with the blocking structures contains the gates 1 of the blocking structures, the drives 2 gates, the regulators 3, the sensors of the water level 4 of the upper reaches, the gauges 5, the comparison units 6, the setting devices 7 forced flow, the formers 8, 13 dead zones, keys 9, 10, elements NOT 11, amplifiers 12 and level adjusters 14. The proposed system improves the stability of the water level control by introducing additional feedback with a significant change in the water level, which also reduces the switching frequency of the gate drive and thereby increases reliability. 1 il.

Description

This invention relates to the automation of water distribution in irrigation.

The invention is to increase the reliability and stability of the system and reduce its cost.

The drawing shows a block diagram of the control system using the example of Two channels.

The control system contains gates 1 of the blocking structures, drives 2 gates 1, controllers 3, sensors 4 levels of the upper 5: phases, sensors 5 of the position of the gates 1, blocks 6 of comparison, setting unit 7 of forced flow, the first shaper 8 of the non-effective zone , keys 9 and 10, elements NOT 11, amplifiers 12, second shaper 13 zones of incomplete twitness and setting devices I 4 levels. . „

. The system works as follows. . .

 When a disturbing action appears in the discharge channel (for example, a change in the consumption of a consumer), the water level starts to change, which causes a signal from the upstream water level sensor 4. This leads to the appearance of a mismatch signal from the output of the comparator unit 6, as a result of which the control signals 3 generate control signals that change the opening magnitude of the devices 1 in the direction of compensation of the disturbance.

Consider the operation of the system for the case of inclusion of the consumer. Enable consumer q. for example, a pumping pumping station, causes a change in water reserves in the area and, consequently, a decrease in the level of sensor 4, and the occurrence of an error signal 0 at the output of block 65. In accordance with the signal at the input, the regulator Cr is generated. control pulse is greater

and through the actuator 2 it increases the opening of the shutter 1 by the value of 4a, corresponding to: 1/1 change in the consumption of the consumer dq, t, e. the water flow through the gate increases by the required amount 4Q, equal to d ,. If the change in the consumption of the consumer is small, then after the transfer time along the length of the section, the required flow will restore the water level in the sensor 4 to a predetermined level and the system will return to the established mode with a new balance of expenses. If the disturbance is significant, then the signal about the change in the water level in the sensor 4, reaches the lower limit of the dead zone set in the driver 8, and a control signal is fed to the input of the keys 9 and lOj allowing the signal from the controller 7 to pass 3 and the signal from the sensor 5 of the shutter position to the element NOT 11, -. A negative signal generated by the output of this element 2 at the output 2 of this element causes the operation of the regulator 3, which closes the setting knob 1, by the value K-A a corresponding to the change in flow. -. The coefficient of compliance with open gate values, depending only on 6t design parameters.

0 drives and gates (lifting speed, span sizes, etc.) is set in amplifier 12. At the same time, a signal is sent to the j controller 3: from the setpoint switch 7. AT

25, this factor is used to calculate the forcing factor K depending on the magnitude of the change in the monitored level (sensor 4) and the technological capabilities of the site (VIII of the unbroken dams, permissible filling depths, etc.). The magnitude of the force is formed in the form of an additional magnitude mismatch applied to the controller 32 s.

35 by the same sign, and that. As a result, there is an increase in the flow rate at the beginning of the section by the forcing value Kf, and the flow K begins to flow through the connection. Closing

40 of gate 1, at this time, causes an increase in the water level in the sensor 4, since the lag time is short here. After that, the system comes to the first steady state.

45 After the travel time of the additional flow, which is significantly less than the travel time of the required flow due to the use of force, the water level in the sensor 4,

gg begins to rise, and the sign of E is reversed, which results in covering the gate 1 ". Since the flow rate is greater than the required one, the signal value from the sensor

55 exceeds the upper limit of the first dead zone, and at the output of the imaging unit 8, a signal appears again permitting the passage of the signal from sensor 5 to regulator 3, and

signal from the setpoint 7 to the controller 3j. Since the rate of change of water level from the flow rate at the beginning of the section after reaching additional volumes of water to the sensor 4, becomes almost equal to the rate of change of water level, the regulators 3 and 3, by controlling the corresponding gates, maintain the level at the end of the section within the allowable range control as force flow is received. After the balance of costs comes into alignment with sensor 4 (taking into account the switched on consumer), the shutter 1 returns to its initial state, and at the shutter jj the required opening value is set. This completes the system overhaul. 20

In order to protect the overheads of the structures from overflowing (emptying), shapers 13 and 132 are introduced into the system, representing the formulas of the image. eteny

The water distribution control system on the channel with the blocking structures, containing at each section of the channel a headwater level sensor, a forced flow setting unit and a series level setting unit, a comparison unit, a regulator, and a gate drive.

The deadbands associated with the position sensor are similar to those of the driver 8, but with a greater range of the zone itself. The formers 13 give a signal to the blocks 14 of the task if the water levels are upper

a thief, characterized in that, in order to increase the reliability and stability of the system and reduce its susceptibility, to a system for each

The construction pools bypassed into the pre-accident of the Canal section of the canal two two zones were introduced ..

In case of disconnection of consumers. Or if it is necessary to change the setpoint of the task unit P, the system works in the same way.

The control system in the adjacent portion of the channel operates interconnectedly and similarly with. first. Change the shutter open l. leads to a change in the level of water in the sensor 4 and further to the formation of a control signal dp of the superposition of the shutter.

40

deadlocker, two keys, a HE element and an amplifier, the upstream level sensor being connected by an output to the inputs of two dead zone drivers, the second input of the comparator unit and the forced flow setting unit input connected to the information input of the first key, the output of which is connected with the second input of the controller, and the control input - with the first output of the first shaper of the deadband, connected by the second output to the control input of the second key, information input cat This is connected to the output of the gate position sensor, and the output through the element is NOT connected to the input of the amplifier connected to the third input of the next section regulator, the output of the second dead zone generator is connected to the second level setting input of the subsequent section.

Thus, the supply of forced costs to the beginning of the sections and, consequently, reduction of the transport delay time, and hence the adjustment cycle, can be called for by forming deadband units that ensure the time of introduction and removal of the force depending on the allowable adjustment range. control of the order of 6361/37 Circulation 863 Subscription Proizv.-poly. pr-tie, Uzhgorod, st. Project, 4

. g y 3148

water level. The absence of consumer flow sensors in the system simplifies the structure-regulation and reduces the required number of information communication channels along the channel, and turning on the second control by discretely changing the signal from the gate position sensor at the beginning of the section reduces the frequency of the gate at the end of the section, reduces overshoot and increases system stability

Formula .izob. eteny

The water distribution control system on the channel with the blocking structures, containing at each section of the channel a headwater level sensor, a forced flow setting unit and a series level setting unit, a comparison unit, a regulator, and a gate drive.

thief, characterized in that, in order to increase the reliability and stability of the system and reduce its susceptibility, the system for each

There are two forms for the channel section of the channel.

deadlocker, two keys, a HE element and an amplifier, the upstream level sensor being connected by an output to the inputs of two dead zone drivers, the second input of the comparator unit and the forced flow setting unit input connected to the information input of the first key, the output of which is connected with the second input of the controller, and the control input - with the first output of the first shaper of the deadband, connected by the second output to the control input of the second key, information input cat This is connected to the output of the gate position sensor, and the output through the element is NOT connected to the input of the amplifier connected to the third input of the next section regulator, the output of the second dead zone generator is connected to the second level setting input of the next section.

Claims (1)

Claim A water distribution control system on a channel with partitioning structures, comprising at each section of the channel an upstream water level sensor, a forced flow rate adjuster and serially connected level adjuster, a comparison unit, a regulator, a shutter drive associated with a shutter position sensor, characterized in that, for the purpose of to increase the reliability and stability of the system and reduce its cost, two deadband drivers, two keys, a NOT element and an amplifier are introduced into the system for each channel section an alternator, and the upstream level sensor is connected by an output to the inputs of two formers of the dead zone, the second input of the comparison unit and the input of the forced flow master connected to the information input of the first key, the output of which is connected to the second input of the regulator, and the control input is connected to the first output the first deadband driver connected by the second output to the control input: a second key, the information input of which is connected to the output of the shutter position sensor, and the output through lement is coupled to the amplifier input connected to the output of the third subsequent input controller portion, an output of second deadband generator coupled to a second input of the setpoint level subsequent portion. WEIIIPI Order 6361/37 Circulation 863 Subscription Production — Polygr. ave, city of Uzhhorod, st. Project, 4