JP2018200584A - Water supply system and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water supply system and a water supply method capable of reducing electric power. SOLUTION: A plurality of pumps for sending water in a water absorption tank to a water discharge tank, a water absorption tank water level gauge for measuring the water level of the water absorption tank, a water discharge tank water level gauge for measuring the water level of the water discharge tank, and the plurality of pumps. The control unit includes a control unit that controls the operation and stop of each of the pumps, and the control unit calculates the total amount of water to be sent at predetermined time intervals based on the water level of the water absorption tank and the water level of the water discharge tank. Then, based on the calculated total amount of water to be sent at the predetermined time interval, the time for the pump to be the final unit to operate at the predetermined time interval is calculated, and the pump to be the final unit can be operated. A water supply system is provided that starts the operation of the final pump and then stops one pump when the time for the final pump to operate has elapsed. [Selection diagram] Fig. 1

Description

  The present invention relates to a water supply system and a water supply method for supplying water from a water absorption tank to a water discharge tank.

  In a pumping pump station, water is pumped from a water tank to a water discharge tank using a plurality of pumps, and in a drain pump station, water is drained from a water tank to a water tank using a plurality of drain pumps. In these pump stations, when the water level and flow rate increase, the number of pumps to be operated is generally increased, and the pump is continuously operated until the water level and flow rate reach target values.

JP 2014-178816 A

When the pump is operated as described above, the operation time of the pump becomes longer than necessary and the power consumption increases. If it does so, it will lead to the increase in an electricity bill, when determining the maximum demand power based on the electric power at the peak time.
This invention is made | formed in view of such a problem, and the subject of this invention is providing the water supply system and water supply method which can reduce electric power.

  According to one aspect of the present invention, a plurality of pumps for feeding water in a water absorption tank to a water discharge tank, a water tank water level meter for measuring the water level of the water absorption tank, and a water discharge tank water level for measuring the water level of the water discharge tank. And a controller that controls the operation / stop of each of the plurality of pumps, and the controller should feed water at predetermined time intervals based on the water level of the water absorption tank and the water level of the water discharge tank. The total amount of water is calculated, and based on the calculated total amount of water to be sent at the predetermined time interval, the time at which the pump serving as the final unit should operate at the predetermined time interval is calculated, and the pump serving as the final unit A water supply system is provided that starts operation of the pump serving as the last unit when the pump becomes operable, and then stops one pump when a time for operation of the pump serving as the last unit elapses.

  It is desirable that the one pump is different from the pump that is the final machine started by the control unit.

  The said control part may judge that the pump used as the last machine is operable, when the actual head based on the water level of the said water absorption tank and the water level of the said water discharging tank is not an area | region where cavitation generate | occur | produces.

  The control unit may stop the one pump by adjusting the opening of the discharge valve, the rotation speed of the impeller, and / or the angle of the pump blade in the one pump.

  The plurality of pumps include pumps having different capacities, and the control unit calculates, for each pump capacity, a time for the pump to be the final unit when the pump having a certain capability is the final unit, Based on the calculated time at which the pump as the last unit should be operated, the average power of the plurality of pumps at the predetermined time interval is calculated for each capacity of the pump, and the pump as the last unit can be operated. Then, the operation of the pump serving as the last unit may be started, and thereafter, the pump having the capability of minimizing the average power may be stopped as the one pump.

  The water supply system is provided in a pumping pump station, the pump is a pumping pump, and the control unit is configured to perform the operation at a time interval preceding the predetermined time interval based on a water level of the water absorption tank and a water level of the water discharge tank. The total amount of water that has flowed out of the water discharge tank and the total amount of water that has been stored in the water discharge tank are calculated, and the total amount of water that has flowed out of the water discharge tank is calculated, and the water that has been stored in the water discharge tank Based on the total amount, the total amount of water to be sent in the predetermined time interval may be calculated.

  The water supply system is provided in a drainage pump station, the pump is a drainage pump, and the control unit is configured to perform the control in the time interval preceding the predetermined time interval based on the water level of the water absorption tank and the water level of the water discharge tank. The total amount of water drained by a plurality of pumps and the total amount of water stored in the water absorption tank are calculated, the total amount of water that has flowed out of the water discharge tank, and the water stored in the water discharge tank Based on the total amount of water, the total amount of water to be sent in the predetermined time interval may be calculated.

  According to another aspect of the present invention, there is provided a water supply method for supplying water in a water absorption tank to a water discharge tank using a plurality of pumps, based on the water level of the water absorption tank and the water level of the water discharge tank, at predetermined time intervals. A total amount of water to be sent is calculated, and based on the calculated total amount of water to be sent at the predetermined time interval, a time at which the pump serving as the final unit should be operated at the predetermined time interval is calculated. There is provided a water supply method in which when the pump to be operated becomes operational, the pump to be the final unit starts to operate, and then one pump is stopped when time for the pump to become the final unit has elapsed.

  The last unit is operated for a time to be operated by the last unit at a predetermined time interval, and then one pump is stopped. Therefore, the power consumption of a plurality of pumps can be reduced, and the electricity cost can be reduced.

The schematic block diagram of the water supply system 100 which concerns on 1st Embodiment. The flowchart which shows an example of the processing operation of the water supply system 100 in 1st Embodiment. The figure which shows a QH characteristic typically. The flowchart which shows an example of the processing operation of the water supply system 100 following FIG. The figure which shows typically the time change of ON / OFF in the three pumps 1 of a pump. The figure which shows typically the time change of ON / OFF in the three pumps 1 of a pump. The flowchart which shows an example of the processing operation of the water supply system 100 in 2nd Embodiment. The figure which shows the relationship between discharge amount (horizontal axis), shaft power P, and the total head H. FIG. The figure which shows the relationship between discharge amount (horizontal axis), shaft power P, and the total head H. FIG. The figure which shows the relationship between discharge amount (horizontal axis), shaft power P, and the total head H. FIG. The schematic block diagram of the water supply system 101 which concerns on 3rd Embodiment. The flowchart which shows an example of the processing operation of the water supply system 101 in 3rd Embodiment.

  Embodiments according to the present invention will be specifically described below with reference to the drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of a water supply system 100 according to the first embodiment. This water supply system 100 is provided in a pumping pump station. The water supply system 100 includes a plurality of (three in this embodiment) pumps 1, a water tank water level meter 2, a water discharge tank water level meter 3, a flow meter 4, and a control unit 5.

  Each of the plurality of pumps 1 pumps (feeds) water in the water absorption tank 11 to the water discharge tank 12. The pump 1 may be capable of adjusting the opening of a discharge valve (not shown), and the amount of pumping increases as the opening increases. Moreover, the pump 1 may be able to adjust the rotation speed of an impeller (not shown), and the pumping volume increases as the rotation speed increases. Further, the pump 1 may be capable of adjusting the angle of pump blades (not shown), and the larger the angle, the larger the pumped amount.

  In the first embodiment, it is assumed that the capacities of all the pumps 1 are equal. As a matter of course, the power consumption increases as the number of pumps 1 to be operated increases, and the power consumption becomes maximum when all the pumps 1 are operated.

The water tank water level meter 2 is provided in the water tank 11 and measures the water level of the water tank 11. The measurement result is notified to the control unit 5.
The water discharge tank water level meter 3 is provided in the water discharge tank 12 and measures the water level of the water discharge tank 12. The measurement result is notified to the control unit 5.
The flow meter 4 is provided on the drain side of the water discharge tank 12 and measures the flow rate of water discharged from the water discharge tank 12. The measurement result is notified to the control unit 5.

  The control unit 5 performs calculations necessary for controlling the pump 1 based on the water level of the water absorption tank 11, the water level of the water discharge tank 12, and the flow rate of water discharged from the water discharge tank 12. And the control part 5 switches each driving | operation / stop of the pump 1 at an appropriate timing based on the result of the calculation. Note that at least a part of the operation of the control unit 5 may be performed by a processor executing a predetermined program.

Specifically, the control unit 5 sets the total amount A [m ³ ] of water pumped up by the three pumps 1 in the same 30 minutes every predetermined time interval (hereinafter referred to as 30 minutes), the water discharge tank The total amount B [m ³ ] of the water flowing out from 12 and the total amount C [m ³ ] of the water stored in the water discharge tank 12 are calculated, and based on these, the total amount D [m ³ ] of water to be pumped in the subsequent 30 minutes ] Is calculated. And when the pumping pump 1 which becomes the last unit (the third unit in the present embodiment) becomes operable in the subsequent 30 minutes, the last unit is operated only for a necessary time, and then the intermittent operation is stopped. I do. This will be described in detail below.

  FIG. 2 is a flowchart illustrating an example of the processing operation of the water supply system 100 according to the first embodiment. The processing in FIG. 2 is performed when a predetermined 30 minutes have elapsed.

Based on the measured water level (water tank water level) by the water tank water level meter 2 and the measured water level (water tank water level) by the water tank water level meter 3, the control unit 5 is the water pumped by the three pumps 1 in 30 minutes. The total amount A [m ³ ] is calculated (step S1). Specifically:

First, the control unit 5 calculates the actual head from the difference between the external water level based on the water discharge tank water level and the internal water level based on the water absorption tank water level. Subsequently, the control unit 5 calculates a resistance characteristic considering the pipe loss resistance, and calculates a pumping flow rate Q0 [m ³ / s] per unit of the pumping pump 1 from a previously stored QH characteristic. To do. The QH characteristic of the pump 1 also depends on the opening of the discharge valve, the rotational speed of the impeller, the angle of the pump blade, and the like. When these can be adjusted, the control part 5 has memorize | stored the QH characteristic beforehand for every opening degree etc. of a discharge valve.

FIG. 3 is a diagram schematically illustrating the QH characteristic. The vertical axis represents the total head H [m], and the horizontal axis Q [m ³ / s] represents the flow rate. The curve shape of the resistance characteristic is determined by the pipe loss resistance, and the intercept of the vertical axis corresponds to the calculated actual head. The intersection of the curve indicating the resistance characteristic and the curve indicating the QH characteristic becomes an operating point, and the water supply flow rate Q0 [m ³ / s] per unit of the pump 1 is determined. Then, the total amount A [m ³ ] of water pumped by the pump 1 is obtained by applying the following formula.
A [m ³ ] = ΣQ0 [m ³ / s] × ti [s]
Note that ti (i = 1 to 3 in the present embodiment) is the operation time of the i-th pump 1.

Returning to FIG. 2, the control unit 5 calculates the total amount C of water stored in the water discharge tank 12 in 30 minutes based on the measurement result of the water discharge tank water level meter 3 (step S <b> 2). Specifically, the following formula is applied from the water tank level h0 [m] 30 minutes before, the current water level h1 of the water tank, and the area S [m ² ] of the water tank 12, and the control unit 5 discharges the water tank in 30 minutes. The total amount C of water stored in 12 is calculated.
C [m ³ ] = (h0 [m] −h1 [m]) × S [m ² ]

Next, the control unit 5 calculates the total amount B of water that has flowed out of the water discharge tank 12 (step S3). As an example, the control unit 5 can calculate the total amount B [m ³ ] of water flowing out of the water discharge tank 12 in 30 minutes using the measurement result of the flow meter 4. Specifically, assuming that the measurement value of the flow meter 4 at a certain time t is F (t) [m ³ / s], the total amount B of water flowing out of the water discharge tank 12 is calculated by applying the following equation.

As another example, the shape of the water discharge tank 12 (specifically, the area S [m ² ] of the water discharge tank 12), the water level change L [m] of the water discharge tank 12 over 30 minutes, the pump 1 calculated in step S1 From the total amount A [m ³ ] of the pumped water, the control unit 5 may calculate the total amount B of the water flowing out of the water discharge tank 12 by applying the following equation.
B [m ³ ] = A [m ³ ] −C [m ³ ]

And the control part 5 makes the total amount B of the water which flowed out from the water discharging tank 12 the total amount D [m < ³ >] of the water which should be pumped in the next 30 minutes.

  FIG. 4 is a flowchart showing an example of the processing operation of the water supply system 100 following FIG. The process of FIG. 4 is performed for the subsequent 30 minutes after the process of FIG. 2 is completed for the preceding 30 minutes.

  When the two pumps 1 are operating (YES in step S11), the control unit 5 calculates the actual head (step S12). Subsequently, the control unit 5 determines that the third pumping pump 1 can be operated if the calculated actual head is not an area where cavitation occurs (YES in step S13). When the third pump 1 is operable and the flow rate of the pump 1 can be adjusted by adjusting the discharge valve opening, the rotation speed, and / or the pump blade angle, the control unit 5 controls the flow rate of the pump 1. An adjustment amount is calculated (step S14).

Further, the control unit 5 calculates a time (operation time) T in which the third pump should be operated (step S15). Specifically, the total amount D [m ³ ] of water to be pumped in 30 minutes, the pumping amount E [m ³ ] in 30 minutes by the other two pumps 1 and the instantaneous amount of the third pump 1 Using the flow rate f [m ³ / s], the control unit 5 calculates the operation time T by applying the following equation.
T [s] = (D [m ³ ] −E [m ³ ]) / f [s]

Here, the total amount D [m ³ ] of water to be pumped in 30 minutes is calculated in step S4 of FIG. The pumping amount E [m ³ ] in 30 minutes by the other two pumps 1 is obtained from the instantaneous flow rate of each pump 1. The instantaneous flow rate of each pump 1 is determined from the resistance characteristics and QH characteristics of the pump 1 as described with reference to FIG.

  Then, the control part 5 starts the driving | operation of the 3rd pumping pump 1 (step S16). When the operation time T of the third pump elapses from the start of operation, the control unit 5 stops the third pump 1 (step S17) and does not perform pumping by the third pump. The pumping pump 1 may be stopped by adjusting the opening of the discharge valve, the rotational speed of the impeller, and / or the pump blade angle. In this way, the third pumping pump 1 is operated for a required time in a predetermined 30 minutes. Therefore, power consumption can be minimized.

  Note that the pump 1 (starting at step S16 “3rd unit”) that started operation at step S16 may coincide with the pumping pump 1 that stops at step S17 (“third unit” at step S17). It is desirable that (FIG. 5A) does not match (FIG. 5B).

  5A and 5B schematically show ON / OFF time changes in the three pumps 1. Three pumps 1 are expressed as pumps 1A to 1C.

  In FIG. 5A, the operation of the pump 1C is started as the third unit (final unit) at time t1, and after the operation time T has elapsed, the pump 1C is also stopped at time t2. Thereafter, at the time t3, the operation of the pump 1C is started as the third unit (final unit), and the pump 1C is also stopped at the time t4. If the operation / stop of only one pump 1C is frequently switched in this way, only the pump 1C may increase the load and deteriorate.

  On the other hand, in FIG. 5B, operation of the pump 1C is started as the third unit (final unit) at time t1, and after the operation time T has elapsed, another pump 1A is stopped as the third unit at time t2. To do. Thereafter, at the time t3, the operation of the pump 1A is started as the third unit, and the different pump 1B is stopped at the time t4. By performing such rotation, all the pumps 1 can be operated in a balanced manner.

Thus, in the first embodiment, based on the total amount B [m ³ ] of water that has flowed out of the water discharge tank 12 and the total amount C [m ³ ] of water stored in the water discharge tank 12 in the preceding specific time interval. Thus, the control unit 5 calculates the total amount D [m ³ ] of water to be pumped in the subsequent specific time interval. And the time which the pumping pump 1 used as the last unit should operate in the following specific time interval is calculated, and the control unit 5 operates the pumping pump 1 used as the final unit for the operating time, and then one pump Stop 1 Thus, by calculating the required operating time for each time interval and operating the pump that is the final unit for the required operating time, power can be suppressed.

(Second Embodiment)
In 1st Embodiment mentioned above, it assumed that the capability of all the pumps 1 was equal. On the other hand, 2nd Embodiment demonstrated below shall include the pumping pump 1 from which capability differs. Hereinafter, in order to simplify the description, it is assumed that the three pumps 1 include a large pump having a large capacity (instantaneous flow rate) and a small pump having a small instantaneous flow rate, and is different from the first embodiment. The explanation will focus on the points.

  FIG. 6 is a flowchart showing an example of the processing operation of the water supply system 100 in the second embodiment, and corresponds to FIG. 4 in the first embodiment. Steps S21 to S23 in FIG. 6 are the same as steps S11 to S13 in FIG.

  When the third pump 1 can be operated and the flow rate of the pump 1 can be adjusted by adjusting the opening of the discharge valve, the rotation speed, and / or the pump blade angle, the control unit 5 controls the pump 5 in the pump 1. The flow rate adjustment amount of the pump and the small pump is calculated (step S24). Further, the control unit 5 calculates the shaft power of the large pump and the small pump based on the previously stored QH-shaft power characteristics (step S25). Since the shaft power of the pump has different characteristics depending on the pump type and specific speed, the control unit 5 stores the pump-specific characteristics.

  For example, in the case of a centrifugal pump, the relationship between the discharge amount (horizontal axis), the shaft power P, and the total head H is as shown in FIG. 6A. In the case of the axial flow pump, the relationship between the discharge amount (horizontal axis), the shaft power P, and the total head H is as shown in FIG. 6B. In the case of a mixed flow pump, the relationship between the discharge amount (horizontal axis), the shaft power P, and the total head H is as shown in FIG. 6A.

  Subsequently, the control unit 5 calculates a time Tl for operating the final unit when the large pump is the final unit, and a time Ts for operating the final unit when the small pump is the final unit. (Step S26).

  Further, the control unit 5 calculates the average power Pl when the large pump is the final unit based on the time Tl, and calculates the average power Ps when the small pump is the final unit based on the time Ts ( Step S27). The average power Pl is the average power for 30 minutes when the two pumps 1 are operated for 30 minutes and the large pump as the final unit is operated for the operation time Tl. The power consumption by the final machine can be obtained by dividing the product of the shaft power calculated in step S25 and the operation time Tl by 30 minutes. The average power Ps is the average power for 30 minutes when the two pumps 1 are operated for 30 minutes and the small pump as the final unit is operated for the operation time Ts. The power consumption by the final machine can be obtained by dividing the product of the shaft power calculated in step S25 and the operation time Ts by 30 minutes.

  Then, the control part 5 starts the driving | operation of the 3rd pumping pump 1 (step S29). When Pl <Ps (YES in step S29), when the operation time Tl has elapsed from the start of operation of the third unit, the control unit 5 stops one large pump (step S30a) and further increases the relevant large value. Do not pump water. On the other hand, when Pl ≧ Ps (NO in step S29), when the operation time Ts has elapsed from the start of operation of the third unit, the control unit 5 stops one small pump (step S30b), and more small pumps concerned. No pumping by.

  As described above, in the second embodiment, the average power when the large pump is the final unit and the average power when the small pump is the final unit are calculated. Unit can be selected.

  In addition, the capability of each of the some pumping pump 1 may mutually differ. Even in that case, the operation time and the average power when the pumped pump 1 having the capacities of steps S26 and S27 in FIG. What is necessary is just to select as a number machine and to stop by step S30a, S30b.

(Third embodiment)
The first and second embodiments described above have the water supply system 100 provided in the pumping pump station in mind. A water supply system 101 to be described next is provided in a drainage pump station. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 7 is a schematic configuration diagram of a water supply system 101 according to the third embodiment. This water supply system 101 is provided in a drainage pump station. The water supply system 101 includes a plurality (three in this embodiment) of drainage pumps 1 ′, a water tank water level meter 2, a water discharge tank water level meter 3, and a control unit 5. Compared with FIG. 1, a difference is that a drainage pump 1 ′ is used instead of the pumping pump 1, and that the flow meter 4 of FIG. 1 is not necessary.

The water supply system 101 according to the present embodiment includes a total amount L [m ³ ] of water drained by the three drain pumps 1 ′ and a water absorption tank at a preset time interval (hereinafter, 30 minutes) during the same 30 minutes. 11 calculates the total amount M [m ³ ] of water stored, and based on these, calculates the total amount N [m ³ ] of water to be drained in the subsequent 30 minutes. Then, when the last unit (the third drainage pump 1 ′ in the present embodiment) that consumes the maximum power in the subsequent 30 minutes becomes operable, the last unit is operated for a necessary time, and thereafter Performs intermittent operation to stop. This will be described in detail below.

  FIG. 8 is a flowchart illustrating an example of a processing operation of the water supply system 101 according to the third embodiment. The process of FIG. 8 is performed when a predetermined 30 minutes have elapsed.

Based on the measured water level (water tank water level) by the water tank water level meter 2 and the measured water level (water tank water level) by the water tank water level meter 3, the controller 5 drains water discharged by the three drain pumps 1 ′ in 30 minutes. The total amount L [m ³ ] is calculated (step S31). Specifically:

First, the control unit 5 calculates the actual head from the difference between the external water level based on the water discharge tank water level and the internal water level based on the water absorption tank water level. Subsequently, the control unit 5 calculates a resistance characteristic in consideration of the pipe loss resistance, and calculates a drainage flow rate Q1 [m ³ / s] per unit of the drainage pump 1 ′ from a previously stored QH characteristic. Calculate (see FIG. 3). Then, the total amount L [m ³ ] of water drained by the drain pump 1 ′ is obtained by applying the following formula.
L [m ³ ] = ΣQ1 [m ³ / s] × ti [s]
Note that ti (i = 1 to 3 in the present embodiment) is the operation time of the i-th drain pump 1 ′.

Moreover, the control part 5 calculates the total amount M of the water stored in the water absorption tank 11 in 30 minutes based on the measurement result of the water absorption tank water level meter 2 (step S32). Specifically, the following equation is applied from the water tank water level h3 [m] 30 minutes ago, the current water tank water level h4 and the area S1 [m ² ] of the water tank 11, and the control unit 5 performs the water tank in 30 minutes. The total amount C of the water stored in 11 is calculated.
M [m ³ ] = (h3 [m] −h4 [m]) × S1 [m ² ]

And the control part 5 calculates the total amount N [m < ³ >] of the water which should be drained in the next 30 minutes, applying the following Formula (step S33).
N [m ³ ] = L [m ³ ] + C [m ³ ]

  Thereafter, the operation and stop of the final machine are controlled in the same manner as in FIG. 4 in the first embodiment.

  Thus, in 3rd Embodiment, electric power can be suppressed also in a drainage pump station. In addition, when the thing in which the capability of several drainage pumps 1 'is different is included, it should just be carried out similarly to 2nd Embodiment.

  The embodiment described above is described for the purpose of enabling the person having ordinary knowledge in the technical field to which the present invention belongs to implement the present invention. Various modifications of the above embodiment can be naturally made by those skilled in the art, and the technical idea of the present invention can be applied to other embodiments. Therefore, the present invention should not be limited to the described embodiments, but should be the widest scope according to the technical idea defined by the claims.

DESCRIPTION OF SYMBOLS 1 Water pump 1 'Drain pump 2 Water tank water level meter 3 Water tank water level meter 4 Flow meter 5 Control part 11 Water tank 12 Water tank 100,101 Water supply system

Claims (8)

A plurality of pumps for feeding water in the water absorption tank to the water discharge tank;
A water tank water level meter for measuring the water level of the water tank;
A water tank water level meter for measuring the water level of the water tank;
A control unit that controls operation / stop of each of the plurality of pumps,
The controller is
Based on the water level of the water absorption tank and the water level of the water discharge tank, the total amount of water to be sent in a predetermined time interval is calculated,
Based on the calculated total amount of water to be sent in the predetermined time interval, the time that the pump as the final unit should be operated in the predetermined time interval is calculated,
When the pump that will be the final machine becomes operational, the pump that will be the final machine starts operation,
Thereafter, when a time for operating the pump as the last unit has elapsed, one water supply system is stopped.   2. The water supply system according to claim 1, wherein the one pump is different from a pump serving as the last unit started by the control unit.   The said control part judges that the pump used as the last machine can be operated when the actual head based on the water level of the said water absorption tank and the water level of the said water discharging tank is not an area | region where cavitation generate | occur | produces. The water supply system described.   4. The control unit according to claim 1, wherein the control unit stops the one pump by adjusting an opening of a discharge valve, an impeller rotational speed, and / or a pump blade angle in the one pump. 5. The water supply system described in. The plurality of pumps include pumps having different capacities,
The controller is
When the pump of a certain capacity is the last unit, the time that the pump as the last unit should be operated is calculated for each capacity of the pump,
Based on the calculated time for the pump to be the last unit to be operated, the average power of the plurality of pumps in the predetermined time interval is calculated for each capacity of the pump,
When the pump that will be the final machine becomes operational, the pump that will be the final machine starts operation,
Thereafter, the water supply system according to any one of claims 1 to 4, wherein the pump having the capability of minimizing the average power is stopped as the one pump. The water supply system is installed at the pumping pump station.
The pump is a pump;
The controller is
Based on the water level of the water absorption tank and the water level of the water discharge tank, the total amount of water that has flowed out of the water discharge tank in the time interval preceding the predetermined time interval and the total amount of water stored in the water discharge tank are calculated. And
The total amount of water to be sent in the predetermined time interval is calculated based on the calculated total amount of water flowing out of the water discharge tank and the total amount of water stored in the water discharge tank. A water supply system according to any one of the above. The water supply system is installed at the drainage pump station,
The pump is a drainage pump;
The controller is
Based on the water level of the water absorption tank and the water level of the water discharge tank, the total amount of water drained by the plurality of pumps in the time interval preceding the predetermined time interval, and the total amount of water stored in the water absorption tank, Calculate
The total amount of water to be sent in the predetermined time interval is calculated based on the calculated total amount of water flowing out of the water discharge tank and the total amount of water stored in the water discharge tank. A water supply system according to any one of the above. A water supply method for supplying water in a water absorption tank to a water discharge tank using a plurality of pumps,
Based on the water level in the water absorption tank and the water level in the water discharge tank, calculate the total amount of water to be sent in a predetermined time interval,
Based on the calculated total amount of water to be sent in the predetermined time interval, the time that the pump as the final unit should be operated in the predetermined time interval is calculated,
When the pump that will be the final machine becomes operational, the pump that will be the final machine starts operation,
Then, the water supply method of stopping one pump when the time which the pump used as the said last unit should operate is passed.

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