SU551617A1 - Water level regulation system in the irrigation canal - Google Patents

Description

one

The invention relates to the automation of water distribution in hydraulic structures and can be used, for example, in water level control systems, mainly irrigation canals.

Known level control systems in cascade mode are known, containing channel sections bounded by blocking devices with gates with actuators and autoregulators connected to communication channels with water level sensors installed at the beginning and end of each adjustable channel section; n with shutters.

The disadvantages of this system are maintaining water levels at constant levels in the pools of the blocking structures, regardless of the flow rates in the canal, as well as the relatively low stability of automatic regulation. This regime of water level in the canal requires, firstly, increased costs for the construction of the canal, secondly, it increases the silting up and overgrowing of the channel, and also increases the seepage losses from the canal.

Another well-known system of circuits is .. the level level contains a valve position sensor, an auto-regulator whose input is connected to a level sensor, and the output is connected to a gate actuator to which the maximum and minimum level sensors are connected.,. . . .

However, this system has a lack of full reliability due to the same speed of opening and closing of the control valves and maintaining constant water levels, regardless of the flow rate of the iiii channel. The aim of the invention is to increase the reliability of the system.

This is achieved by the fact that the system additionally introduces blocks for the formation of a gate movement signal and, subsequently, jointly connected comparison blocks, amplifications to the setpoint of the reference, connected to the autoregulator, the output of which is connected via the riej MuiiiL-iifl signal block to the gate drive, and input c. Connected to the sensor. tuli. Hyen. i-rinrjiin.

Ia Chorgtszho slyma-igku depicts the extension of the system.

(kstsg.ch | -oguliropE31 NYa Blyukeet a se umpSgs ;; 1 kaipla, a gate 2 with a drive 3, the joint venture;: - ;; ;;; opt: ; Hii is the signal of movement of the shutter 4 from the j-biXo.aoM of the auto-regulator 5 of the signal. At UBID6, piacTKe 1. Author's inputs are with sensor 7 and, the controller is with the setting unit Zggp. 3, the accelerated unit 9 and the cpQBfJOiiHH lOj input block of the comparison unit 10 nofl1 are to the sensor polo sensor (-; gate 11). Before gate 2, sensors are installed, (max. 12 and mini; ay 13 of the upper level of the upper tail, connected e with a 3-stroke drive 2. The drawing also shows the outlet 14, the sharpened coop TKeHHe with shutter 15, the possible positions of water levels 16, 6 and 17 in the level gauge 7, the position of the water level 18 before shutter 15, and also adjacent to the regulated section 1 sections 19 and 20 of the channel, equipped, for example, similarly to section 1.

The level control system works as follows.

The shutter 4 signal formation blocks are adjusted with different gain factors of 1 depending on the sign of the shutter 2 movement. For example, the shutter 2 is closed to increase, in order to prevent the channel 1 from overfilling, and to open the closed one to ensure stability and high precision in steady state. Block 8 is configured to automatically change the setpoint of the task depending on changes in water flow and the position of the shutter 2. Block 9 generates statism in the system with the system providing enhanced stability of the system with the calculated control accuracy and is configured with the ability to change the coefficient of statism Comparison unit 10 is configured to ensure automatic converting the value of the actual value of the water flow through the shutter 2 and the magnitude of its opening into the appropriate setting 6 water levels in the function of the necessary interdependence between the opening of the shutter 2, the flow of water through the shutter 2 and the setpoint of setting the appropriate water level 6, subject to the simultaneous implementation of the law of operational changes in the level of 18.

gate 15, depending on the flow through gate 2. Sensor 7 is installed as close as possible to gate 2 in the cross section to which the water backwater from downstream gate 15 spreads. In the established average mode, the water inflow to section 1 through gate 2 is equal to the outflow of water through iodine outlet 14 and shutter 15, and the water level 18 is at a mark desired by the operating conditions, depending on the amount of water flow through the canal, for example, at a mark close to the normal propped level (NPC), thereby introducing a discharge 14 is stable Flow rate.

With an estimated increase in the water flow to the outlet 14 or through the shutter 15, the water level 6 begins to decrease, then according to a signal from the sensor 7, the autoregulator 5 through. One of the blocks of the shutter travel signal generator 4 opens the shutter by a certain amount. This in turn will cause a flow change signal to be sent through the gate 2 by the sensor 11 to the comparison unit 1O, which according to the relationship between the flow rate, the opening of the gate 2 and the water level setpoint 6, signals a corresponding change in the level setting of 6 ps, therefore, through the gain unit 9, block 8 of the task setting. Block 8 changes the value of the setpoint of level 6, which sends a signal to autoregulator 5, which additionally opens the shutter 2 by a certain amount of acceleration, thereby the transient regulation process. This system operation continues until the water level 18 before the downstream gate comes to its original, and the water level 6 to the new position, corresponding to the increased flow rate value in the outlet 14 through the gate 2.

A change in the position of the shutter 2 and an increase in the flow rate through it cause transients similar to section 1 in all the juxtaposed sections 19 of the channel up to the head structure, thereby automatically increasing the required water flow through the system. When the calculated reduction of water consumption in the outlet 14 or through the shutter 15, the elements of the system work similarly, but in the opposite direction. Moreover, as water consumption in water intakes and along the canal as a whole decreases, water level 6 tends to drop to level 16 at zero flow. As a result, due to a decrease in the living cross section of the flow, a filtering surface is reduced at a considerable part of the channel channel, and the speed of the water flow, although it decreases with decreasing flow rates,