SU1016425A1 - Method of controlling water feed at a canal section - Google Patents

Abstract

METHOD OF WATER SUPPLY MANAGEMENT IN THE CHANNEL PLOT, which includes level measurement by means of sensors at controlled points of the site, correction of the position of the inlet regulator according to the results of a comparison of sensor readings, in order to improve the accuracy of maintaining a given level in an arbitrary stabilization correction the position of the regulator is carried out according to the indications of the sensors on the supply section and in the stabilization section, and the correction is carried out after expiration of the travel time from the regulator torus to the stabilization target.

Description

lu.lg

(Ll

O) 4 U

sl / 77. The invention relates to agriculture, in particular, the automation of water distribution in irrigation, for example, in water level stabilization systems at a site:. channel irrigation system. There is a known method for stabilizing a water supply unit UJ4H at a site of the irrigation system, including measuring the water level at the stabilization stage, comparing the set and changing levels; At the stabilization stage, adjusting the level at which the water flow at the site is changed to maintain a constant level (flow rate) stabilization. This method is implemented as an automatic water flow regulator 1. A disadvantage of the method is the low accuracy of maintaining the water level at the stabilization point when the water level changes in other gauges in which the level measurement can be monitored. There is also known a method of water supply at the canal site, which includes measuring levels by means of sensors at controlled points of the site and correcting the position of the regulator of the supply section by comparing the readings of sensors 2. The disadvantage of this method is the low accuracy of maintaining a constant preset level or flow of water in the stabilization point. with an arbitrary choice of the stabilization site due to the impossibility of using the existing number of measurements on the site. When assigning a stabilization level at the end of the section and changing the level or flow of water at the beginning of the section, the change will reach the end of the section and only then will it be eliminated, which makes it impossible to maintain a constant predetermined flow rate at the end of the section, compared to the possibility of eliminating the change in time. by measurement at the beginning of the plot. The aim of the invention is to improve the accuracy of maintaining a given level in an arbitrary stabilization tool. This goal is achieved by the fact that, according to the method, the adjustment of the position of the regulator is carried out according to the readings of the sensors in the supply section and in the stabilization point, and the correction is carried out according to the flight time from the regulator to the stabilization alignment. FIG. Figure 1 shows a diagram of a method for adjusting levels by means of a regulator on a downstream downstream area; in fig. 2 is a schematic of a method for level control by means of a regulator on a side feed section; in fig. 3 is a memory device for implementing the method. The method is as follows. In the initial steady state mode, simultaneous level (flow) measurements are made by the sensors of the beginning 1 and end 2 of the channel section 3. Then the signal of the sensor 2 is compared with the signal of a given level at the stabilization bar in the reference element 4, after which the comparison signal is recorded (remembered ) at the output of the device 5 memory. Then the values of the signal of the sensor 1 and the comparison signal from the output of the device 5 of the memory are summed at the output of the adder 6, the values of which are compared with the value of the signal of a given initial level of N o. In the sensor 1, from the output of the comparison element 7, the signal of the last comparison is formed, according to which the flow rate changes to the beginning of the channel 3 section from the output of the regulator 8 by changing the position of the shutter 9. At the same time, the initial steady state is characterized by the equality of the signals from the sensor 2 and Diff. signals of sensor 1 and Nos., so the signal from the output of comparing element 7 is zero. When the water flow in the water outlet 10B at the beginning of the section changes, the signal of the sensor 1 will change, which in turn will cause the comparison signal to appear from the output of the comparison element 7, other than zero, which changes the flow rate at the beginning of the section using the output of the regulator 8 by changing the position of the shutter 9. At the time of moving the changing flow rate from the shutter 9 to the sensor 1, a process pause is formed by the controller 8, and after the pause, the process at the channel section 3 is re-established. Figure 11 at the end of the section changes the signal of the sensor 2, which leads to the appearance of the comparison signal from the output of the comparison element 4, other than zero, and then through the memory device 5, the output of which is remembered, the adder 6 will receive a similar signal at the output of the element 7, in which the flow rate changes in the beginning of the section as described, and through the technological pause time, the changed signal in the sensor assembly 1 is compensated for by a change in the signal in the sensor sensor 2, so that the comparison signal from the output of the comparison element 7 becomes m zero. Moreover, the comparison signal from the output of the comparison element 4 is disconnected from the process of changing the flow rate of water in the area for the time of the flow of the changed water flow from the sensor 1 to the sensor 2, then the comparison signal from the output of the comparison element 4 will again be equal to zero, and there will be a new steady-state process in the section of channel 3. The comparison signal from the output of the comparison element 7 is zero, since the change in the signal from sensor 1 is compensated by the signal from memory device 5. With a further change of the comparison signal from the output of the comparison element 4, the corrected value of the comparison signal is recorded at the output of the memory device 5. Besides. The corrected value of the comparison signal can also be fixed during the run-up of the changed flow from the gauge 1 to gauge 2 when the comparison signals are exceeded at the output of the comparison element 4 by the memory device 5. In the scheme (Fig. 2) of the implementation of the method of controlling the water supply in the section of the open channel with the feed path, it is assumed for simplicity that the running times of water flow from the sensor track 1 to the sensor track 2 are equal. Penetration of water regulation processes according to this scheme is similar to that described, except that it is rational to have a measurement in the feed path when using measurements in a feedback circuit, and with a possible change in the flow rate (level) in the measurement area, from a change in the flow rate in the upstream water source, for a quick elimination of disturbances arising in order to increase the accuracy of maintaining a given level at the stabilization point (sensor line 2). The memory device (Fig. 3) contains compensation blocks 12-15, pause block 16, comparison elements 17-19, adder 20, one-shot 21 and 22, threshold element 23, keys 24-27, match elements 28 and 29, inverter 30 The memory device operates as follows. In the initial state, the keys 24 and 26 are opened from the first output of block 16, the keys 25 and 27 are closed, and from the second output there is an enabling signal at the first input of the coincidence element 29, at the second input of which there is a inhibitory signal from the output of the threshold element 23. the output of the one-shot 21 has a inhibitory signal at the first input of the matching element 28, the second input of which also has a inhibitory signal from the output of the one-vibration 22. The output signals of the compensation blocks 13-15 are zero, assuming that the output signal of the element 4 is compared with neither is zero. in the case of a signal different from zero from the output of the comparison element 4, this signal passes to the first inputs of the comparison element 19 and the adder 20. From the output of the comparison element 19 through the public key 26, the difference signal is fed to the input of the compensation unit 15, the last change is the calculation of its output signal before the compensation at the second input of the signal comparison element 19 at its first input. After that, the output signal of the comparison element 19 becomes equal to zero, and the compensation unit 15 ceases to change its output signal. Blocks 13 and 14 compensation work similarly. The signal at the first input of the adder 20, added to the output signal of the compensation unit 14 at the second input, from the output of the adder arrives at the first input of the comparison element 17; from the output of which the differential signal through the key 24 is fed to the input of the one-shot 21 and the input of the block 13 compensation. After the block 13 compensates for the signal at the first input of the comparison element 17, the output signal of the latter becomes equal to zero. The output signal of the compensation unit 13 is fed through the inverter 30 to the output of the memory device. If this signal exceeds the dead zone of the regulator 8, the latter generates a control signal, at the end of which the enabling signal appears through the one-shot 22 at the second input of the coincidence element 28. The first input also contains an enable signal from the output of the one-shot 21. A crack signal appears at the time of the end of the compensation signal of the sensor 2 at the first input of the adder 20. The duration of the release signal from the output of the one-shot 21 is selected based on the need to match the end of the control signal of the regulator 8 from the output of the one-shot 22. By coincidence of the signals at the inputs of the coincidence element 28, its output signal appears, which is fed to the first input of the pause unit 16. In this case, the pause unit forms a pause necessary to achieve the flow of water from the entrance target to the stabilization station for which the keys 24 and 26 are closed, and the keys 25 and 27 are opened. During the opening time of the key 25, the compensation unit 14 compensates the output signal of the unit 15 at the first input element 18 comparison. The output signal of the comparison element 19 through the key 27 is fed to the input of the threshold element 23. If the output signal of the comparison element 19 exceeds the insensitivity threshold of the threshold element 23, then from the output of the last trace, the enabling signal at the second input of the matching element 29, the output signal of which input unit 16 pause, set it to its original state. In the initial state, the pause unit 16 is also set at the end of the pause generation. In addition, note that when the pause time is approaching its final value, a prohibiting signal appears at the first input of the reference element 29 from the second output of the pause block. This is necessary so that there is no incorrect collection of a pause from the output of the threshold element 23 with, for example, an earlier flow of water to the stabilization range. Now, after installation of the pause unit 16 to the initial state of the system operation, it occurs in a similar way as described. If the signal from the output of element 4 of the comparison is zero, then the output signal of block 13

the compensation does not change, since it, arriving at the second input of the comparison element 17, is equal to the output signal of the compensation block 14, coming through the adder 20 to the first input of the comparison element 17.

F1 / G.2

The use of the proposed method allows to increase the accuracy of maintaining a constant predetermined level or flow rate of water at the stabilization point (arbitrary) of the measuring points.

Claims (1)

METHOD OF WATER SUPPLY MANAGEMENT AT THE CHANNEL PLOT, including measuring the levels by means of sensors at the controlled points of the site, correcting the position of the regulator of the supplying site by comparing the readings of the sensors, characterized in that, in order to increase the accuracy of maintaining a given level in an arbitrary stabilization target, the position of the controller is adjusted by the readings of the sensors in the inlet section and in the stabilization range, and the correction is carried out after the running time from the controller to stabilization solution. FIG. /