JP2019140954A - Water supply control system - Google Patents

Abstract

To manage water supply properly by considering a situation of whole water utilization strain, from a pump station to a paddy field.SOLUTION: A water supply control system is configured so that, based on pump characteristic information indicating correlation between a pump flow rate and a pump pressure according to a pump rotation number in a water feeding pump 11 installed on a pump station 100, loss characteristic information indicating correlation between a pump flow rate and a pump pressure for applying a necessary lowest water head to a maximum loss valve in opening, when a water feeding valve 21 installed on each paddy field of a farm field 200 and a water distribution valve 31 installed on a pipe line 300 are opened or closed in an optional combination, and use state information of the valve flow rate and the valve pressure, a pump rotation number of the water feeding pump 11 is determined, according to the pump characteristic of the water feeding pump 11 and use states of respective valves 21, 31, the pump rotation number for allowing the water feeding pump 11 to distribute water without shortage and excess can be determined.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a water distribution control system, and in particular, has a water source pump station on the supply side, each paddy field in the irrigation area on the demand side, and a pipeline connecting the pump station and each rice field. It is suitable for use in a water distribution control system that controls water distribution in a water system.

  Conventionally, in paddy field areas where water supply pipelines and irrigation channels have been established, in order to carry out favorable water level management according to the growth and weather of rice, the target water level of the paddy field is set appropriately, and a water supply valve installed for each paddy field A system in which the water level measurement value is within a predetermined allowable range of the target water level by automatically controlling is used.

  For example, Patent Document 1 discloses a system that supplies irrigation water to a fixed water level with respect to a plurality of cultivation areas in which paddy fields are divided by a simple shore provided between a pair of opposing farm roads. In the water management system described in Patent Document 1, a water supply pipe is embedded in one farm road, and a drain pipe is embedded in the other farm road. Water is forcibly supplied to the water supply pipe by a water supply pump installed in the water collecting trough, and the water is supplied to each cultivated area through each water supply valve. The irrigation water in each cultivated area is brought to a constant water level by a water level adjuster, and surplus water is returned to the water collecting basin by a drain pipe.

  Patent Document 2 discloses that in a paddy field composed of a plurality of paddy fields, a water supply valve for each paddy field and a pumping pump at the water source can be remotely and automatically operated in order to increase the efficiency and cost of irrigation. It is disclosed. The water management system described in Patent Document 2 is able to provide water supply fairly and sufficiently to each paddy field even if the daily irrigation water supply is limited to the paddy field area composed of a plurality of sections. Even so, water supply can be performed so as to avoid cold water temperature problems.

  Specifically, for a paddy field area consisting of multiple sections, the water temperature of the paddy field and the water temperature of the water supply pipeline are compared, and if the difference is less than the predetermined value, the pump is operated to supply water to the water supply pipeline. I do. Further, the necessity of water supply is determined by comparing the target water level of the paddy field with the current paddy field water level, and water is supplied to the paddy field according to the water supply sequence. At this time, the water supply timing is set so that the number of paddy fields simultaneously supplied with water does not exceed a predetermined number, and the water supply amount or the water supply pressure does not fall below a predetermined value.

  In addition, although it does not adjust the water level of a paddy field, in patent document 3, the water for pumping purified water from the distribution pipe network of the waterworks arranged via the pipeline from the distribution reservoir to the end user is pumped. A water distribution system is disclosed. In the water distribution system described in Patent Document 3, a pressure gauge and a flow meter are installed at the inlet of the distribution pipeline network, and a pressure gauge is installed at the end of the distribution pipeline network, and discharge is performed based on the end pressure setting value. The pressure target value is calculated, and the number of pumps operated and the number of pump revolutions are controlled based on the discharge pressure target value. Moreover, based on the demand forecast value for one day in the time series predicted based on the past flow actual value accumulated in the monitoring DB and the weather information such as weather / temperature that is input from the operator, The discharge pressure required to make the terminal pressure constant is calculated from the pump QH curve and the pipe resistance curve, and a feedforward signal for terminal pressure control is calculated.

Japanese Patent Laid-Open No. 9-14280 JP 2001-161192 A JP 2009-209523 A

  According to the system described in Patent Document 1, it is possible to keep the water to be supplied to a plurality of paddy fields at a constant water level. However, in the system described in Patent Document 1, only a mechanism for performing water management of the paddy field on the demand side is provided, and the mechanism of water management in consideration of the situation of the pump station and pipeline on the supply side is not provided. Not provided.

  Therefore, even if the system described in Patent Document 1 is used, it is possible to prevent problems such as ineffective discharge from the pumping station and abnormal pressure in facilities such as pipelines and terminal water supply pipes. Can not. That is, there is a possibility that problems such as excessive use of water, and conversely, water is not supplied when necessary. Excessive water use not only increases the electricity cost of the pump, but also causes accidents such as equipment damage due to excessive pressure generation.

  Further, in the system described in Patent Document 2, the water supply valve of the paddy field is remotely and automatically operated so that the number of paddy fields that are simultaneously supplied with water does not exceed a predetermined number, or the water pump at the water source is remotely and automatically operated. By performing the operation, it is possible to prevent the water supply amount or the water supply pressure from falling below a predetermined value. However, in this system, the water management in the paddy field on the demand side and the water management of the pumping pump on the supply side are performed separately, so optimal water distribution management from the pump station to the paddy field is performed. I can't. Therefore, even if the system described in Patent Document 2 is used, problems such as excessive discharge or insufficient discharge to paddy fields or abnormal pressure in facilities are prevented as in the system of Patent Document 1. Can not.

  Further, in the system described in Patent Document 3, it is possible to perform water distribution management considering both the inlet and the end of the water distribution pipe network. However, the system described in Patent Document 3 does not perform water distribution management for paddy fields in an irrigation area, and cannot perform optimal water distribution management according to demand in individual paddy fields. Therefore, even if the system described in Patent Document 3 is used, problems such as excessive discharge or insufficient discharge to paddy fields or abnormal pressure in facilities occur as in the systems of Patent Document 1 and Patent Document 2. Can not prevent.

  The present invention has been made to solve such problems, and considering the overall situation of each paddy field in pumping stations, pipelines, and irrigation areas, the present invention does not have an excessive discharge or insufficient discharge. It aims to be able to manage the proper water distribution.

  In order to solve the above-described problems, in the water distribution control system of the present invention, the pump station in the water source area on the supply side, each paddy field in the irrigation area on the demand side, and the pipe connecting the pump station and each paddy field Water distribution is controlled in a water supply system comprising a line. Specifically, regarding the feed water pump installed at the pump station, pump characteristic information showing the correlation between the pump flow rate and the pump pressure according to the pump rotation speed, and the feed valve and pipe installed for each paddy field When the diversion valve installed on the line is opened / closed in any combination, the minimum required for the water supply valve at the position with the greatest loss from the pumping station among the open water supply valves Based on loss characteristic information that shows the correlation between pump flow rate and pump pressure when giving water head, and information that shows the usage status of water supply valves installed in each paddy field and water diversion valves installed in pipelines The pump rotation speed of the water supply pump is determined.

  According to the present invention configured as described above, based on the characteristics of the pump flow rate and the pump pressure of the feed water pump in the pump station, and the usage status information of the water supply valve in each paddy field and the water diversion valve in the pipeline, each actual According to the use situation of the valve, it is possible to determine the number of rotations of the pump for distributing the water supply pump without excess or deficiency. Thereby, in consideration of the overall situation of the pump station, the pipeline, and each paddy field, it is possible to perform appropriate water distribution management without excessive discharge or insufficient discharge to the paddy field. As a result, it is possible to prevent problems such as excessive supply of water to the paddy field and water not being supplied when necessary, and significant energy saving and water saving can be achieved through appropriate water distribution management. It is also possible to prevent equipment damage due to excessive pressure.

It is a figure which shows the example of whole structure of the water distribution control system by this embodiment. It is a block diagram which shows the function structural example with which the server of this embodiment is provided. It is the figure which showed the pump characteristic information typically. It is the figure which showed loss characteristic information typically. It is a figure for demonstrating the 1st method of calculating R curve. It is a figure for demonstrating the 2nd method of calculating R curve. It is a figure for demonstrating operation | movement of a pump rotation speed determination part. It is a block diagram which shows the function structural example of the server which concerns on a modification. It is a figure for demonstrating the method of correct | amending R curve.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Drawing 1 is a figure showing the example of whole composition of the water distribution control system by this embodiment. As shown in FIG. 1, the water distribution control system of the present embodiment includes a pump station 100 in a water source area on the supply side, a farm field 200 having a plurality of paddy fields in an irrigation area on the demand side, a pump station 100, and a farm field 200. It is a system which controls the water distribution in the water supply system which has the pipeline 300 which connects between each of these paddy fields.

  The pump station 100 includes a water supply pump (pumping pump) 11 for supplying water from a water source (not shown) to the pipeline 300, a flow meter 12 for measuring the pump flow rate of the water supply pump 11, and a water supply pump 11. A pressure gauge 13 for measuring the pump pressure, and a flow meter 12 and a PLC (Programmable Logic Controller) 14 connected to the pressure gauge 13 are provided. The PLC 14 can be connected to the server 400 via a communication network 700 such as the Internet, and transmits the pump flow rate and the pump pressure measured by the flow meter 12 and the pressure gauge 13 to the server 400 according to a predetermined sequence.

  The field 200 in the irrigation area is divided into three field blocks BL1, BL2, and BL3 in the example of FIG. The water diversion valves 31 are respectively installed. Further, a flow meter 32 for measuring the valve flow rate of the water diversion valve 31 and a pressure gauge 33 for measuring the valve pressure of the diversion valve 31 are installed corresponding to each water diversion valve 31.

  A wireless communication device 34 is connected to each flow meter 32 and pressure gauge 33. The wireless communication device 34 transmits the valve flow rate and valve pressure of the water diversion valve 31 measured by the flow meter 32 and the pressure gauge 33 to the PLC 25. At the time of this transmission, the wireless communication device 34 uses a unique valve ID assigned to the water diversion valve 31 in order to be able to identify which diversion valve 31 is the measured valve flow rate and valve pressure. Send.

  In addition, although the example which divides the irrigation area of the agricultural field 200 into three agricultural field blocks BL1, BL2, BL3 was shown here, the number of blocks is not limited to this. Moreover, depending on the scale of the agricultural field 200, it may not be divided into a plurality of agricultural field blocks (corresponding to a single agricultural field block). In this case, it is not necessary to provide the water diversion valve 31 at the entrance of the field block, and it is not necessary to install the flow meter 32, the pressure gauge 33, and the wireless communication device 34 corresponding to the diversion valve 31.

  One field block is divided into a plurality of paddy fields (cultivation zones) by farm roads, simple shores, and the like. A water supply valve 21, a flow meter 22 for measuring the valve flow rate of the water supply valve 21, a pressure gauge 23 for measuring the valve pressure of the water supply valve 21, and a wireless communication device 24 are installed in each partitioned rice field. ing. The wireless communication device 24 transmits the valve flow rate and the valve pressure of the water supply valve 21 measured by the flow meter 22 and the pressure gauge 23 to the PLC 25. At the time of transmission, the wireless communication device 24 transmits a unique valve ID assigned to the water supply valve 21 in order to be able to identify which water supply valve 21 is the measured valve flow rate and valve pressure. .

  In FIG. 1, only the water supply valve 21, the flow meter 22, the pressure gauge 23, and the wireless communication device 24 provided in one paddy field are denoted by reference numerals, but the other paddy fields have the same configuration. (In order to make the drawing easy to see, the reference numerals are omitted).

  The PLC 25 can be connected to the server 400 via a communication network 700 such as the Internet, and the valve flow rate of the water supply valve 21 measured by the flow meter 22 and the pressure gauge 23 installed corresponding to the water supply valve 21 of each paddy field. The valve flow rate and the valve pressure of the diversion valve 31 measured by the flow meter 32 and the pressure gauge 33 installed corresponding to the diversion valve 31 are transmitted to the server 400 according to a predetermined sequence.

  The water supply valve 21 may be an automatic water tap that automatically controls the opening and closing so as to keep the water supplied to the paddy field at a certain level, or the farmer manually opens and closes the water. It may be a manual faucet to perform. When the water supply valve 21 is an automatic water tap, a water level meter is further installed in the paddy field. The water supply valve 21 which is an automatic water tap monitors the water level measured by a water level gauge, and opens the valve when detecting that the water level has dropped by a predetermined amount from a preset water level, for example. Then, when it is detected that the preset water level has been reached, the valve is closed.

  Each of the paddy fields in the field 200 is not necessarily cultivated simultaneously in all of these fields. That is, depending on weather conditions, farmer's farming plan, and various other reasons, paddy fields that are cultivated in a certain period and paddy fields that are not cultivated may be mixed. In a paddy field that has been cultivated for a certain period, the water supply valve 21 operates (opens and closes) periodically or irregularly. In a paddy field that has not been cultivated for a certain period, the water supply valve 21 does not operate (open / close) during that period.

  The server 400 includes a pump flow rate and a pump pressure sent from the PLC 14 of the pump station 100, and a valve flow rate and a valve pressure sent from the farm field 200 and the PLC 25 of the pipeline 300 (the valve flow rate and the valve pressure of the water supply valve 21, Based on the flow rate and valve pressure of the diversion valve 31, water distribution control is performed from the pump station 100 to each paddy field in the farm field 200 via the pipeline 300. Details of this will be described later.

  The server 400 is configured to be connected to a manager terminal 500 used by a facility manager of the pumping station 100 and a farmer terminal 600 used by a farmer in the farm 200 via the communication network 700. By accessing the server 400, the manager terminal 500 and the farmer terminal 600, in addition to the operation status of the water supply pump 11, the water diversion valve 31, and the water supply valve 21, the rotation speed of the water supply pump 11 determined as described later. For example, information obtained as a result of processing by the server 400 can be browsed. Further, the administrator terminal 500 and the farmer terminal 600 can input information related to water distribution control by accessing the server 400.

  FIG. 2 is a block diagram illustrating a functional configuration example provided in the server 400. As shown in FIG. 2, the server 400 includes a pump characteristic information acquisition unit 41, a loss characteristic information acquisition unit 42, a usage status information acquisition unit 43, and a pump rotation speed determination unit 44 as its functional configuration. Each of these functional blocks 41 to 44 can be configured by any of hardware, DSP (Digital Signal Processor), and software. For example, when configured by software, each of the functional blocks 41 to 44 actually includes a CPU, RAM, ROM, etc. of a computer, and is stored in a recording medium such as RAM, ROM, hard disk, or semiconductor memory. Is realized by operating.

The pump characteristic information acquisition unit 41 acquires the pump characteristic information indicating the correlation between the pump flow rate and the pump pressure according to the pump rotation speed for the feed water pump 11 installed in the pump station 100. FIG. 3 is a diagram schematically showing the pump characteristic information. FIG. 3 shows a QH curve in which the horizontal axis represents the pump flow rate Q [m ² / s] and the vertical axis represents the pump pressure H [m: water column meter]. N _{0 to} N ₃ indicate the rotational speed of the feed water pump 11, and the magnitude relationship is N ₀ > N ₁ > N ₂ > N ₃ . These QH curves corresponding to the number of rotations of the pump are determined from design values (specifications) of the feed water pump 11 to be used.

  For example, the pump characteristic information acquisition unit 41 inputs the specification information published by the manufacturer of the feed water pump 11, and as the pump characteristic information indicating the correlation between the pump flow rate and the pump pressure according to the pump rotation speed, The QH curve of the feed water pump 11 is acquired. In addition, when the specification information to input is the QH curve itself, the input QH curve may be acquired as it is as pump characteristic information. On the other hand, when the input specification information is a combination value of discrete pump flow rate and pump pressure, an approximate curve is calculated from these discrete values, and a QH curve composed of the approximate curve is expressed as a pump characteristic. What is necessary is just to acquire as information. The specification information is input from the administrator terminal 500 by the facility manager of the pumping station 100, for example.

  When the loss characteristic information acquisition unit 42 opens and closes the water supply valve 21 installed for each paddy field of the farm field 200 and the water diversion valve 31 installed as necessary for the pipeline 300 in any combination, When the required minimum head is given to the water supply valve 21 (hereinafter referred to as the maximum loss valve during opening) in the position where the loss from the pumping station 100 is the largest and the water is difficult to get out of the water supply valve 21 being opened. The loss characteristic information indicating the correlation between the pump flow rate and the pump pressure is acquired. Here, the case where the water diversion valve 31 is installed as necessary for the pipeline 300 is a case where the agricultural field 200 is divided into a plurality of agricultural field blocks.

  The necessary minimum water head is a pressure necessary for the necessary water to flow from the water supply valve 21. For example, a steady pipe using a known nodal head method in which the amount of water supplied from the water supply valve 21 to the paddy field is set in advance and the shape loss such as friction loss from the pump to the pipe of the water supply valve 21 and bending of the pipe is considered. The required minimum water head can be calculated by line analysis. In this case, the position where the loss from the pumping station 100 is the largest and the water is hard to come out means the position where the water is hard to come out including the loss due to both the friction loss and the shape loss. A loss characteristic is a characteristic which shows the pressure loss which arises when water flows in the pipe of the water supply valve 21 or the water diversion valve 31.

FIG. 4 is a diagram schematically showing this loss characteristic information. FIG. 4 shows an R curve with the horizontal axis representing the pump flow rate Q [m ² / s] and the vertical axis representing the pump pressure H [m]. The point O at the right end of the R curve has the greatest loss from the pumping station 100 when all the water supply valves 21 of all the paddy fields are opened (this is referred to as the maximum flow rate or all the valves are opened). The pump flow rate and pump pressure of the feed water pump 11 required to give the required minimum head to the feed water valve 21 at the position are shown. In addition, the S point at the left end of the R curve is the water supply when only the water supply valve 21 of the paddy field at the position where the loss is greatest from the pump station 100 is opened (this is called the maximum loss valve open). The pump flow rate and pump pressure of the feed water pump 11 required to give the minimum required water head to the valve 21 are shown.

  Each point on the curve between point O and point S opens one or more of the plurality of water supply valves 21 and the plurality of water diversion valves 31 on the entire water system in any combination. When plugged, the water supply necessary to give the minimum required head to the water supply valve 21 (maximum loss valve during opening) of the water supply valve 21 that is open and at the position where the loss is greatest from the pumping station 100 The pump flow rate and pump pressure of the pump 11 are shown.

  The loss characteristic information acquisition unit 42 calculates and acquires an R curve as shown in FIG. 4 as loss characteristic information. Various methods can be applied to the calculation of the R curve. In the following, two calculation methods will be exemplified.

  FIG. 5 is a diagram for explaining the first method. In the case of using the first method, the loss characteristic information acquisition unit 42 first finds the water supply valve 21 that has the largest loss when the valve is opened alone by steady pipeline analysis. Next, when the water supply valve 21 and the water diversion valve 31 are opened and closed in an arbitrary combination, the combination of the pump flow rate and the pump pressure required to give the minimum water head required for the maximum loss valve during opening is a steady pipeline. Calculated by analysis. In FIG. 5, each plotted point indicated by a circle indicates the respective calculation result. Next, the loss characteristic information acquisition unit 42 calculates one approximate curve from these plot points, and sets the approximate curve as an R curve.

  FIG. 6 is a diagram for explaining the second method. In the case of using the second method, the loss characteristic information acquisition unit 42 firstly has the pump flow rate and the pump pressure at the point S at which the maximum loss occurs when the maximum loss valve is opened, and the point O at which the maximum loss occurs when all the valves are opened. Only pump flow and pump pressure are calculated. The calculation method here may be either the above-described pipeline analysis or a method for obtaining the maximum loss when the water supply valve 21 is sequentially opened in the field. In the latter case, when the water supply valve 21 is opened alone, the maximum loss point can be automatically found by obtaining the information of the flow meter 22 and the pressure gauge 23, so that the S point can be obtained without performing pipeline analysis. Can be obtained.

  Next, the loss characteristic information acquisition unit 42 obtains a polynomial connecting the S point and the O point, and thereby sets the curve represented by the polynomial as the R curve. The polynomial mode (shape mode) is set in advance. According to the second method, it is possible to estimate the R curve without calculating the valve flow rate and the valve pressure when the water supply valve 21 and the water diversion valve 31 are opened and closed in many combinations. . In addition, by grasping the opening / closing information of which water supply valve 21 is opened / closed, the S point can be automatically detected even when the position of the maximum loss valve changes, and the R curve is redrawn accordingly. This makes it possible to distribute water more appropriately. In addition, as described later, the opening / closing information of the water supply valve 21 is used status information (valve ID) sent from the flow meter 22 and the pressure gauge 23 of each paddy field to the server 400 via the wireless communication device 24 and the PLC 25. It is possible to grasp based on.

  The usage status information acquisition unit 43 acquires information indicating the usage status of the water supply valve 21 installed in each paddy field of the farm field 200 and the water diversion valve 31 installed in the pipeline 300 via the communication network. That is, the usage status information acquisition unit 43 includes a flow meter 22 and a pressure gauge 23 installed corresponding to the water supply valve 21 of each paddy field, and a flow meter 32 installed corresponding to the water diversion valve 31 of the pipeline 300. And measurement information on at least one of the valve flow rate and the valve pressure measured by the pressure gauge 33 is acquired as usage status information from the PLC 25 via the communication network 700 together with the valve ID of each valve.

  In the following description, as an example, the usage status information acquisition unit 43 acquires the measurement information of the valve flow rate. In this case, when the valve flow rate acquired by the usage status information acquisition unit 43 indicates a value other than “0”, it can be said that the valve corresponding to the measured value is in use (in operation). On the other hand, when the valve flow rate shows a value of “0”, it can be said that the valve corresponding to the measured value is not in use (stopped).

  As described above, each of the paddy fields in the agricultural field 200 is not necessarily cultivated at the same time, and there is a water supply valve 21 that is operating and a water supply valve 21 that is not operating. In the usage status information acquisition unit 43, the valve flow rate measured by the flow meter 22 when the water supply valve 21 installed in the paddy field corresponding to the cultivation period is opened and the water diversion valve 31 are opened. Sometimes the valve flow rate measured by the flow meter 32 is obtained.

  The pump rotational speed determination unit 44 includes pump characteristic information (QH curve) acquired by the pump characteristic information acquisition unit 41, loss characteristic information (R curve) acquired by the loss characteristic information acquisition unit 42, and usage status Based on the usage status information acquired by the information acquisition unit 43, the pump rotation speed of the feed water pump 11 is determined.

  Specifically, the pump rotation speed determination unit 44 is based on the loss characteristic information (R curve) acquired by the loss characteristic information acquisition unit 42 and the usage status information acquired by the usage status information acquisition unit 43. The minimum required head is given to the water supply valve (maximum loss valve during opening) from the pumping station 100 among the water supply valves 21 indicated to be opened by the use status information. The pump flow rate and the pump pressure required for this are obtained as demand information. And the pump rotation speed determination part 44 determines the pump rotation speed of the feed water pump 11 based on the calculated | required demand information and the pump characteristic information (QH curve) acquired by the pump characteristic information acquisition part 41. To do.

  Below, the processing content of this pump rotation speed determination part 44 is demonstrated in detail. First, the pump rotation speed determination unit 44 specifies which water supply valve 21 and the water diversion valve 31 are operating during the same period based on the valve ID acquired together with the measurement information by the use state information acquisition unit 43. . In addition, even if it is the some water supply valve 21 installed in the some rice field during a cultivation period, it is not necessarily open at the same time. Therefore, the pump rotation speed determination unit 44 does not specify that the valves 21 and 31 from which the measurement information has been acquired at the same time are operating at the moment, but each valve from which the measurement information has been acquired within a predetermined period. 21 and 31 are identified as operating during the same period.

  When the operating valves 21 and 31 (valves opened within a predetermined period) can be identified based on the usage status information (valve ID) acquired by the usage status information acquisition unit 43, the pump rotation speed Based on the loss characteristic information (R curve) acquired by the loss characteristic information acquisition unit 43, the determination unit 44 is the maximum loss during plug opening at the position where the loss is greatest from the pumping station 100 among the water supply valves 21 in operation. It is possible to specify the pump flow rate and pump pressure required to provide the minimum required head for the valve.

  That is, the pump rotation speed determination unit 44 opens the valves 21 and 31 that are actually in operation, and gives the necessary minimum head to the maximum loss valve during opening when other valves that are not in operation are closed. The combination of the pump flow rate and the pump pressure required for the calculation is calculated by steady pipeline analysis in the same manner as the calculation of each plot point described with reference to FIG. The value calculated in this way does not necessarily exist on the R curve. This is because the R curve itself is an approximate curve. Therefore, the pump rotation speed determination unit 44 obtains a value on the R curve that is closest to the calculated value, and this value of the R curve is necessary to give the necessary minimum water head to the maximum loss valve during opening. Identified as pump flow and pump pressure. The pump rotation speed determination unit 44 obtains the pump flow rate and the pump pressure on the R curve thus specified as demand information in each paddy field of the field 200.

  Next, the pump rotation speed determination unit 44 is indicated by the demand information obtained as described above among the pump characteristic information (QH curve) corresponding to the pump rotation speed acquired by the pump characteristic information acquisition unit 41. A QH curve having the pump flow rate and pump pressure on the R curve as values on the curve is identified. And the pump rotation speed of the said specific QH curve is determined as a pump rotation speed of the feed water pump 11 according to demand information.

  Here, the pump flow rate and the pump pressure on the R curve are obtained as demand information in each paddy field of the field 200. However, at least one of the pump flow rate and the pump pressure calculated from the measurement information is obtained from the field 200. You may make it obtain | require as demand information in each paddy field. In this case, the pump rotation speed determination unit 44 firstly selects the water supply valve 21 that is shown to be opened by the usage status information based on the usage status information acquired by the usage status information acquisition unit 43. Of these, at least one of the pump flow rate and the pump pressure required to give the minimum required head to the maximum loss valve during opening is determined by steady pipeline analysis, and this is used as demand information. For example, the pump flow rate is obtained as demand information.

  Next, the pump rotation speed determination unit 44 acquires the pump flow rate obtained as the demand information, the pump characteristic information (QH curve) acquired by the pump characteristic information acquisition unit 41, and the loss characteristic information acquisition unit 42. Based on the loss characteristic information (R curve), the pump rotation speed of the feed water pump 11 is determined. That is, after obtaining the point on the R curve that is the pump flow rate obtained as demand information as described above, the point on the R curve obtained as described above among the QH curves corresponding to the pump rotation speed QH curve passing through is specified. And the pump rotation speed of the said specific QH curve is determined as a pump rotation speed of the feed water pump 11 according to demand information.

FIG. 7 is a diagram for explaining the operation of the pump rotation speed determination unit 44. In FIG. 7, the QH curve of the pump rotation speed N ₀ shows the pump flow rate Q _A of the feed water pump 11 and the pump pressure required to give the necessary minimum head to the maximum loss valve during opening when all valves are opened. a Q-H curve passing through the point O shows the bets, the pump speed shows a case should be a maximum of N _0.

On the other hand, when the demand information calculated by the pump rotation speed determination unit 44 is, for example, the value of the _SB point on the R curve specified by the pump flow rate Q _B , the pump rotation speed determination unit 44 identify the Q-H curve passing through S _B point, the pump speed N ₁ of the specified Q-H curve is determined as a pump speed of the water supply pump 11 in accordance with the demand information.

Similarly, when the demand information calculated by the pump speed determining unit 44 is, for example, the value of the _SC point on the R curve specified by the pump flow rate Q _C , the pump speed determining unit 44 _A QH curve passing through the point _C is specified, and the pump rotation speed N ₂ of the specified QH curve is determined as the pump rotation speed of the feed water pump 11 according to the demand information. Further, when the demand information calculated by the pump rotation speed determination unit 44 is, for example, the value of the S _D point on the R curve specified by the pump flow rate Q _D , the pump rotation speed determination unit 44 sets the S _D A QH curve passing through the point is specified, and the pump rotation speed N ₃ of the specified QH curve is determined as the pump rotation speed of the feed water pump 11 according to the demand information.

Conventionally, since water distribution management considering actual usage of the water supply valve 21 and the water diversion valve 31 has not been performed, the pump rotation speed of the water supply pump 11 is set to a high value (for example, in order to prevent shortage of discharge). , N ₀ ). On the other hand, in this embodiment, the pump rotation speed of the water supply pump 11 is obtained in consideration of the actual use situation of the water supply valve 21 and the water diversion valve 31.

In this way, the water supply valve 21 and the water diversion valve are compared to the case where the water supply pump 11 is always operated at the maximum pump rotational speed N ₀ regardless of the usage state of the water supply valve 21 and the water diversion valve 31. Appropriately determine the pump speed (for example, N ₁ , N ₂ , N ₃ ) for the water supply pump 11 to distribute water without excess or deficiency in accordance with the actual usage status of the valve 31 (which is in operation). can do.

For example, when the pump flow rate as the demand information is S _B , the pump pressure can be reduced by H _B shown in FIG. 7 as compared with the case where the feed water pump 11 is operated at the maximum pump speed N ₀ . Similarly, the pump flow rate of the demand information can reduce the pump pressure in the case of S _C only H _C, pump flow rate of the demand information in the case of S _D can be reduced pumping pressure by H _D . Here, S _B > S _C > S _D , H _B <H _C <H _D , and the lower the pump flow rate on demand, the higher the pump pressure reduction effect of the feed water pump 11.

  The pump rotation speed of the feed water pump 11 determined as described above is provided as information that can be browsed by accessing the server 400 from the administrator terminal 500 or the farmer terminal 600. The facility manager of the pump station 100 accesses the server 400 from the manager terminal 500, confirms the pump rotation speed of the feed water pump 11 determined as described above, and actually follows the pump rotation speed of the feed water pump 11 accordingly. To control.

  Thereby, in consideration of the entire situation of the pump station 100, the farm field 200, and the pipeline 300, it is possible to perform appropriate water distribution management without excessive discharge or insufficient discharge to each paddy field. As a result, it is possible to prevent problems such as excessive supply of water to the paddy field and water not being supplied when necessary, and significant energy saving and water saving can be achieved through appropriate water distribution management. It is also possible to prevent equipment damage due to excessive pressure.

  Note that a control device (including an inverter or the like) that can communicate with the server 400 is provided in the pump station 100 and the determination is made by notifying the control device of the pump rotation speed determined by the pump rotation speed determination unit 44 of the server 400. The pump rotational speed of the feed water pump 11 may be automatically controlled by the control device so that the pump rotational speed is set. Moreover, you may make it the control apparatus of the pump station 100 provide the function of the pump characteristic information acquisition part 41 with which the server 400 is provided, the loss characteristic information acquisition part 42, the use condition information acquisition part 43, and the pump rotation speed determination part 44. . In addition, this control apparatus is corresponded to the control part of a claim.

  In the above embodiment, based on the usage status information in the flow meter 22 and pressure gauge 23 installed corresponding to the water supply valve 21 and the flow meter 32 and pressure gauge 33 installed corresponding to the water diversion valve 31. Although the example which determines the pump rotation speed of the feed water pump 11 was demonstrated, it is made to determine the pump rotation speed of the feed water pump 11 based on the schedule information input previously regarding the use schedule of the feed water pump 11 and the feed water valve 21. Is also possible.

  FIG. 8 is a block diagram illustrating a functional configuration example of the server 400 according to a modification example in which the pump rotation speed is determined based on the schedule information. In FIG. 8, the same reference numerals as those shown in FIG. 2 have the same functions, and therefore redundant description is omitted here. As illustrated in FIG. 8, the server 400 according to the modification further includes a schedule creation unit 45 as its functional configuration. Further, a pump rotation number determination unit 44 ′ is provided instead of the pump rotation number determination unit 44.

  The schedule creation unit 45 includes a schedule for a predetermined period related to the operation of the water supply pump 11 installed in the pumping station 100 (hereinafter referred to as a pump schedule), and a portion installed in the water supply valve 21 and the pipeline 300 installed in each paddy field. A schedule (hereinafter referred to as a valve schedule) for a predetermined period related to opening / closing of at least one of the water valves 31 is created. As a specific functional configuration for that purpose, the schedule creation unit 45 includes a schedule input unit 45A and a schedule adjustment unit 45B.

  The schedule input unit 45A inputs a pump schedule for a predetermined period (for example, for one month or several months) from the administrator terminal 500, and inputs a valve schedule for the same predetermined period from the farmer terminal 600. The pump schedule is set by the facility manager of the pump station 100 in consideration of the water storage status of the water source, weather forecast information for a predetermined period, operation status including maintenance of the facility of the pump station 100, and the like. This is information indicating at what timing and at what flow rate the pump 11 is operated.

  The valve schedule is set by a farmer in the field 200 in consideration of water use demand based on the cultivation operation status of paddy fields and the growth status of rice. Specifically, the valve schedule is determined based on which paddy field water supply valve 21 of each paddy field in the field 200 is to be opened and which of the water diversion valves 31 installed in the pipeline 300. This is information indicating at what timing the water valve 31 is opened. With this valve schedule, it is specified at what timing and how much water is required for the field 200 as a whole.

  If there is a difference between the pump flow rate specified by the pump schedule input by the schedule input unit 45A and the valve flow rate specified by the valve schedule input by the schedule input unit 45A, the schedule adjustment unit 45B Adjust the pump schedule or valve schedule so that there is no difference. The valve flow rate specified in the valve schedule is simultaneously opened as a whole of the field 200 (it is not meant to be simultaneous in a strict sense, but is opened at some timing within a predetermined unit period). This is the total flow rate of water flowing through the scheduled water supply valve 21.

  Specifically, the schedule adjustment unit 45B adjusts the valve schedule so as to reduce the valve flow rate so that the difference is eliminated when the pump flow rate specified by the pump schedule is less than the valve flow rate specified by the valve schedule. To do. On the other hand, when the pump flow rate specified by the pump schedule is larger than the valve flow rate specified by the valve schedule, the pump schedule is adjusted so as to reduce the pump flow rate so that the difference is eliminated.

  The case where the pump flow rate specified by the pump schedule is smaller than the valve flow rate specified by the valve schedule is when the amount of water stored in the water source is insufficient for the water demand of the farmer. In this case, water cannot be supplied according to the valve schedule input according to the water demand of the farmer. Therefore, in this case, the valve schedule is adjusted so as to reduce the valve flow rate in the entire field 200. For example, the schedule adjustment unit 45B determines how much the flow rate of the water supply valve 21 is reduced or how much the flow rate of the diversion valve 31 is reduced based on a preset water management rule. To decide.

  The water management rule is a rule in which water distribution priority is set for each field block. For example, the rule of preferentially supplying water to the upstream paddy field is an example. In addition, when there are three field blocks BL1, BL2, BL3 on the downstream side of the water diversion valve 31 as shown in FIG. 1, when water in the water source is insufficient, BL1, BL2, It is good also as a rule which supplies water in order of BL3. At this time, when water is supplied to the farm block BL1, the water diversion valves 31 of the other farm blocks BL2 and BL3 are closed. Similarly, when water is supplied to the field blocks BL2 and BL3, the water diversion valve 31 of the field block that does not supply water is closed. By carrying out like this, there exists an effect which prevents surplus water being distributed to the water supply valve 21 which is not used. Such water management rules generally indicate priorities determined by practices for each region. Therefore, this rule can be set in advance with arbitrary contents. In addition, it is good also as a structure which adjusts so that it may become a valve schedule which satisfy | fills a pump schedule by, for example, reducing the valve flow rate of the some water supply valve 21 equally, without setting a water management rule.

  Although the example in which the schedule adjustment unit 45B automatically adjusts the valve schedule has been described here, the present invention is not limited to this. For example, information indicating how much the pump flow rate specified by the pump schedule is smaller than the valve flow rate specified by the valve schedule is presented as information that can be viewed from the farmer terminal 600 by accessing the server 400. Then, the farmer who has confirmed this information may adjust the valve schedule by re-inputting the valve schedule from the farmer terminal 600.

  On the contrary, the case where the pump flow rate specified by the pump schedule is larger than the valve flow rate specified by the valve schedule is a case where the water supply amount from the water source is surplus with respect to the water demand amount of the farmer. In this case, the amount of water supplied from the water source may be reduced to the extent that the farmer's water demand is satisfied. Therefore, in this case, the pump schedule is adjusted so as to reduce the surplus water supply amount.

  The pump rotation speed determination unit 44 ′ includes the pump flow rate specified by the pump schedule adjusted by the schedule adjustment unit 45B, the pump characteristic information (QH curve) acquired by the pump characteristic information acquisition unit 41, and the loss characteristic. Based on the loss characteristic information (R curve) acquired by the information acquisition unit 42, the pump rotation speed of the feed water pump 11 is determined. The operation of the pump rotational speed determination unit 44 'is other than using the pump flow rate specified based on the pump schedule as the demand information instead of using the pump flow rate specified based on the usage status information as the demand information. Is the same as in the above-described embodiment.

  In the above embodiment, the O point indicating the pump flow rate and the pump pressure required to give the minimum required head to the maximum loss valve during opening when all valves are opened, and when the maximum loss valve is opened. Although an example has been described in which an R curve that connects between the S point indicating the pump flow rate and the pump pressure required to give the minimum required head to the maximum loss valve during opening is described, the present invention is not limited to this.

  The R curve obtained in the above embodiment is the water supply valve 21 having the largest loss from the pump station 100 as the terminal flow rate, but only the water supply valve 21 having the smallest loss at the position closest to the pump station 100 is opened. When plugging and supplying water, a pump pressure smaller than the S point may be used. Therefore, as shown in FIG. 9, the pump pressure at the point S may be corrected so as to be corrected downward, and an R curve connecting the corrected point S ′ and point O may be obtained. That is, it becomes possible to perform the optimum pump operation according to the demand by grasping the opening position of the water supply valve 21 in real time. By doing in this way, further water saving and power saving become possible.

When the water supply valve 21 is an automatic water tap, information indicating the opening / closing state of the water supply valve 21 and the water level of the paddy field measured by the water level gauge may be transmitted from the PLC 41 to the server 400 via the communication network 700. Good. In this case, since the water supply amount by the water supply valve 21 can be estimated based on the rising speed of the water level of each paddy field, the R curve can be corrected to a state closer to the actual situation. That is, since the position of use of the water supply valve 21 is known, when only the water supply valve 21 close to the pumping station 100 is opened, the pump rotation speed is set to N according to the estimated water supply amount of the water supply valve 21. It becomes possible to drop to a value smaller than ₃ .

  For example, after calculating the R curve connecting the S point and the O point by the second method as shown in FIG. 6, the R curve is corrected as shown in FIG. Pipeline analysis for calculating plot points is unnecessary, and an R curve that is more realistic can be obtained to determine the pump speed of the feed water pump 11.

  It is not necessary for all of the water supply valves 21 to be automatic hydrants, and the pipeline is based on the open / close status sent from the partially installed automatic hydrant and the measurement information of the valve flow rate and valve pressure. It is possible to create an R curve by estimating the overall use situation from the positional relationship from 300 upstream to downstream. For example, based on the measurement information of the water supply valve 21 at a certain position, it can be estimated that the water supply valve 21 downstream is not in use.

  Moreover, in the said embodiment, the valve | bulb which transmits the measurement information of the flowmeters 12 and 22 and the pressure gauges 13 and 23 installed corresponding to each valve | bulb 21 and 31 in operation to the server 400, and transmits with the said measurement information Although the example which specifies the valve | bulb in operation (valve opened within the predetermined period) by ID was demonstrated, this invention is not limited to this. For example, the opening / closing information of the valves 21 and 31 may be transmitted to the server 400 together with the valve ID. Or you may make it transmit only valve ID of each valve | bulb 21 and 31 in operation. The measurement information may be used only as information that can be browsed by accessing the server 400 from the administrator terminal 500 or the farmer terminal 600.

  Moreover, in the said embodiment, the usage condition information of the water supply valve 21 in each paddy field of the agricultural field 200 and the water diversion valve 31 of the pipeline 300 is transmitted to the server 400, and the pump rotation speed of the water supply pump 11 in the pump station 100 is transmitted in the server 400. An example of determining the above has been described. Moreover, it mentioned that automatically controlling the pump rotation speed of the feed water pump 11 based on the determined pump rotation speed. On the other hand, based on the adjustment result of the schedule, the control signal is transmitted from the server 400 via the PLC 25 and the wireless communication device 34 to automatically control the opening / closing of the water diversion valve 31 constituted by the automatic water faucet. You may do it. For example, in the case where water in the water source is insufficient, when the water supply restriction is performed for each of the field blocks BL1, BL2, and BL3 after the schedule adjustment according to the above-described water management rule, the water diversion valve 31 corresponding to the field block that does not perform water supply. It is possible to automatically perform control such as closing or adjusting the flow rate by limiting the opening degree.

  Similarly, based on the adjustment result of the schedule, the control signal is transmitted from the server 400 via the PLC 25 and the wireless communication device 24 to automatically control the opening / closing of the water supply valve 21 constituted by the automatic water tap. May be. For example, according to the water management rule described above, it is possible to automatically perform control such as closing the water supply valve 21 corresponding to a paddy field where water is not supplied or adjusting the flow rate by limiting the opening degree.

  As described above, when the server 400 automatically controls the opening and closing of the water supply valve 21 and the water diversion valve 31 according to the adjusted valve schedule, the server 400 stores information on water management rules in advance.

  Note that the above-described automatic control of the water supply valve 21 and the water diversion valve 31 may be performed based on control from a control device provided in the pumping station 100 instead of control from the server 400. For example, the control device of the pumping station 100 has the functional configuration shown in FIG. 8, and it is possible to remotely and automatically control the opening and closing of the water supply valve 21 and the water diversion valve 31 according to the valve schedule adjusted by the control device. .

  In addition, each of the above-described embodiments is merely an example of implementation in carrying out the present invention, and the technical scope of the present invention should not be construed in a limited manner. That is, the present invention can be implemented in various forms without departing from the gist or the main features thereof.

DESCRIPTION OF SYMBOLS 11 Water supply pump 21 Water supply valve 22, 32 Flow meter 23, 33 Pressure gauge 24, 34 Wireless communication apparatus 41 Pump characteristic information acquisition part 42 Loss characteristic information acquisition part 43 Usage condition information acquisition part 44, 44 'Pump rotation speed determination part 45 Schedule creation unit 45A Schedule input unit 45B Schedule adjustment unit 100 Pump station 200 Farm field 300 Pipeline 400 Server

Claims (7)

Water supply system comprising a water source pump station on the supply side, a field having a plurality of paddy fields in the irrigation area on the demand side, and a pipeline connecting the pump station and each paddy field in the field A water distribution control system for controlling water distribution in
Regarding the feed water pump installed in the pump station, a pump characteristic information acquisition unit that acquires pump characteristic information indicating a correlation between the pump flow rate and the pump pressure according to the pump rotation speed;
The pump among the water supply valves that are opened when the water supply valve installed for each paddy field and the water diversion valve installed for the pipeline as needed are opened and closed in any combination A loss characteristic information acquisition unit for acquiring loss characteristic information indicating a correlation between a pump flow rate and a pump pressure when a required minimum head is given to a water supply valve at a position where the loss is greatest from the field;
A usage status information acquisition unit for acquiring information indicating the usage status of the water supply valve installed in each paddy field and the water diversion valve installed in the pipeline, via a communication network;
Based on the pump characteristic information acquired by the pump characteristic information acquisition unit, the loss characteristic information acquired by the loss characteristic information acquisition unit, and the usage status information acquired by the usage status information acquisition unit, A water distribution control system comprising: a pump rotation speed determination unit that determines a pump rotation speed of the water supply pump.   The pump rotation speed determination unit is opened based on the usage status information based on the loss characteristic information acquired by the loss characteristic information acquisition unit and the usage status information acquired by the usage status information acquisition unit. The pump flow rate and the pump pressure required to give the minimum required head to the feed water valve at the position where the loss is greatest from the pump station among the feed water valves shown to be 2. The water distribution control according to claim 1, wherein the pump rotation speed of the feed water pump is determined based on the obtained demand information and the pump characteristic information acquired by the pump characteristic information acquisition unit. system.   The pump rotation speed determination unit is based on the usage status information acquired by the usage status information acquisition unit, the pump station of the water supply valve that is shown to be opened by the usage status information To obtain at least one of a pump flow rate and a pump pressure required to give the above-mentioned minimum water head to the water supply valve at the position where the loss is greatest, as demand information, and the obtained demand information and the pump characteristic information acquisition unit The pump rotation speed of the feed water pump is determined based on the pump characteristic information acquired by the above and the loss characteristic information acquired by the loss characteristic information acquisition unit. Water distribution control system. A pump schedule that is a schedule of a predetermined period related to the operation of the water supply pump installed in the pump station, and the water supply valve installed in each paddy field and the water diversion valve installed in the pipeline as necessary. A schedule creation unit for creating a valve schedule that is a schedule for the predetermined period related to at least one of opening and closing;
The schedule creation part
A schedule input unit for inputting the pump schedule and the valve schedule;
If there is a difference between the pump flow rate specified by the pump schedule input by the schedule input unit and the valve flow rate specified by the valve schedule input by the schedule input unit, the difference is eliminated. The water distribution control system according to any one of claims 1 to 3, further comprising a schedule adjustment unit that adjusts the pump schedule or the valve schedule. When the pump flow rate specified by the pump schedule input by the schedule input unit is less than the valve flow rate specified by the valve schedule input by the schedule input unit, the difference is lost. As described above, the valve schedule is adjusted to reduce the valve flow rate, while the pump flow rate specified by the pump schedule input by the schedule input unit is specified by the valve schedule input by the schedule input unit. Adjust the pump schedule to reduce the pump flow so that the difference is eliminated
The pump rotation speed determination unit is configured to receive the pump flow rate specified by the pump schedule adjusted by the schedule adjustment unit, the pump characteristic information acquired by the pump characteristic information acquisition unit, and the loss characteristic information acquisition unit. The water distribution control system according to claim 4, wherein the pump rotation speed of the water supply pump is determined based on the acquired loss characteristic information.   The control part which automatically controls the pump speed of the said feed water pump so that it may become the pump speed determined by the said pump speed determination part, It further provided with the any one of Claims 1-5 characterized by the above-mentioned. The water distribution control system according to Item 1.   Control that automatically controls opening and closing of at least one of the water supply valve and the water diversion valve according to the adjusted valve schedule and a predetermined water management rule when the schedule adjustment unit adjusts the valve schedule The water distribution control system according to claim 4 or 5, further comprising a section.