JP2023080883A - Rainwater drain pump control device, rainwater drain system, rainwater drain method, and program - Google Patents

Abstract

To efficiently perform activation and deactivation of a drain pump.SOLUTION: A rainwater drain pump control device of the present embodiment comprises a variable-speed pump dynamic control unit which varies a first activation water level indicating a water level at which a variable-speed drain pump installed in a pump well in rainwater drain equipment is activated and a first stop water level indicating a water level at which the drain pump is deactivated according to a predicted value of flow-in quantity of rainwater that flows into the pump well, and performs control to determine an actual flow rate of the variable-speed drain pump in accordance with the first activation water level and the first stop water level.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to a rainwater drainage pump control device, a rainwater drainage system, a rainwater drainage method, and a program.

In order to avoid flood damage caused by torrential rains and localized heavy rains (so-called guerrilla rains), which have been increasing in recent years, measures against rainwater are required. In response to this situation, the Ministry of Land, Infrastructure, Transport and Tourism has implemented inundation countermeasure projects through soft countermeasures (software countermeasures) such as utilization of observation data such as rainfall information, in addition to hard countermeasures such as the development of inundation countermeasure facilities such as rainwater trunk lines. are promoting Against this background, as soft measures, drainage pump dynamic control technology based on prediction of the amount of rainwater flowing into the pump wells that store rainwater in the pump station, which is a rainwater drainage facility (rainwater pump dynamic (also called control technology) has been developed.

Drainage pump dynamic control technology predicts the amount of rainwater that flows into pump wells within a pumping station, and according to the estimated rainwater inflow amount, makes the drainage pump start and stop water levels variable. This technology efficiently starts and stops the drainage pump according to the starting water level and the stopping water level. This technology is expected to reduce the risk of flooding and reduce the number of times pumps start and stop.

On the other hand, some local governments have adopted water level setting control, which is conventional drainage pump control, in which each drainage pump is started and stopped according to the preset water level while looking at the water level of the pump well. , chattering of the pump (unnecessary start/stop of the pump) occurs, and the number of start/stop times of the pump increases. In contrast, by applying the above-mentioned drainage pump dynamic control technology, it is possible to reduce the number of times the pump starts and stops while suppressing the risk of flooding. Limited to facilities.

Japanese Patent No. 6261960

In recent years, in addition to rainwater drainage facilities that employ fixed-speed pumps, rainwater drainage facilities that employ variable-speed pumps are increasing. For this reason, even in rainwater drainage facilities that employ variable speed pumps, it is desirable to be able to efficiently start and stop the drainage pumps, to reduce the risk of flooding and reduce the number of times the pumps start and stop.

The problem to be solved by the invention is to provide a rainwater drainage pump control device, a rainwater drainage system, a rainwater drainage method, and a program that enable efficient starting and stopping of the drainage pump.

The rainwater drainage pump control device of the embodiment sets a first activation water level indicating a water level at which a variable speed drainage pump installed in a pump well in a rainwater drainage facility is activated, and a first stop water level indicating a water level at which the variable speed drainage pump is stopped, A variable speed pump that is varied according to an inflow amount prediction value of rainwater flowing into the pump well, and is controlled to determine an actual flow rate of the variable speed drainage pump according to the first start water level and the first stop water level. Equipped with a dynamic control unit.

The figure which shows an example of a structure of the rainwater drainage system which concerns on embodiment. FIG. 4 is a diagram showing an example of the configuration of a pump actual flow control unit 5; FIG. 4 is a diagram showing an example of a configuration in which some functions of a variable speed pump dynamic control section 21A and a fixed speed pump dynamic control section 21B are shared; 4 is a flowchart showing an example of the operation of the rainwater drainage pump control device 10; 5 is a flowchart showing an example of a processing procedure in which the operation shown in FIG. 4 is made more detailed;

Embodiments will be described below with reference to the drawings.

(System configuration)
FIG. 1 shows an example of the configuration of a rainwater drainage system according to an embodiment.

A pump well 100 for storing rainwater is provided in a rainwater drainage facility (inside a pumping station) to which the rainwater drainage system of the embodiment is applied. The pump well 100 is equipped with a variable speed drainage pump 101 (hereinafter referred to as "variable speed pump 101") and a fixed speed drainage pump 102 (hereinafter referred to as "fixed speed pump 102"). In addition, the pump well 100 is provided with a rainwater inflow part 103 into which rainwater flows, and a water level gauge 104 for measuring the current water level of the pump well 100 . The measured current water level data is sent to a rainwater drainage pump control device 10 (hereinafter sometimes abbreviated as "pump control device 10"), which will be described later.

The rainwater drainage system of the embodiment includes a rainwater drainage pump control device 10, a variable speed pump 101, a fixed speed pump 102, a water level gauge 104, and the like.

(Configuration of rainwater drainage pump control device 10)
The rainwater drainage pump control device 10 is configured as, for example, a computer. Various functions provided in the rainwater drainage pump control device 10 are constructed as a program to be realized by a computer.

(Function for controlling operation of variable speed pump 101)
The rainwater drainage pump control device 10 has, as functions for controlling the operation of the variable speed pump 101, a calculation unit 1, a pump flow rate calculation unit 2, and a variable speed pump dynamic control unit 21A. Note that the calculation unit 1 and the pump flow rate calculation unit 2 may be configured to be included in the variable speed pump dynamic control unit 21A.

The variable speed pump dynamic control section 21A is a function constructed using a drainage pump dynamic control technology (rainwater pump dynamic control technology). The variable-speed pump dynamic control unit 21A sets a first start-up water level indicating a water level at which the variable-speed pump 101 is started and a first stop water level indicating a water level at which the variable-speed pump 101 is stopped as predicted inflow amount of rainwater flowing into the pump well 100. , and control is performed to determine the actual flow rate of the variable speed pump 101 according to the first starting water level and the first stopping water level. The actual flow rate here refers to the flow rate actually applied to the control of the variable speed pump 101, and is distinguished from the pump flow rate (described later) used in the process of determining the flow rate. Specific control by the variable speed pump dynamic control section 21A may be realized using the method described in Japanese Patent No. 6261960, for example.

The calculation unit 1 outputs the deviation between the target water level of the pump well 100 and the current water level. The pump flow rate calculation unit 2 calculates a pump flow rate corresponding to a flow rate command value for the variable speed pump 101 according to the deviation between the water level target value of the pump well 100 and the current water level.

Specifically, the pump flow rate calculation unit 2 calculates PI The control calculates the flow rate of the variable speed pump 101 (pump flow rate).

MV= _Kp (e+1/T _I ∫edt) Equation (1)
Here, each parameter in Equation (1) is defined as follows.

e: deviation (in this example, water level target value - current water level)
MV: operation signal (pump flow rate in this example)
K _p : proportional gain T _I : integration time In calculating the deviation e in equation (1), the target water level of the pump well 100 may be determined using the predicted inflow amount. For example, when the predicted inflow is large, the target water level of the pump well 100 is set low in the deviation e of the formula (1), and when the predicted inflow is small, the deviation e in the formula (1) sets the pump well Increase the water level target value of 100. The determination of the water level target value of the pump well 100 is not limited to this example, and may be determined using another method.

The variable speed pump dynamic control unit 21A determines the actual flow rate of the variable speed pump 101 according to the pump flow rate, and discharges the rainwater in the pump well 100 at the determined actual flow rate (or stops the discharge). 2) controls the variable speed pump 101;

The variable speed pump dynamic control unit 21A includes a pump start/stop water level setting unit (first pump start/stop water level setting unit) 3A, a pump start/stop command determination unit (first pump start/stop command determination unit) 4A, and a pump An actual flow controller (first pump actual flow controller) 5 is included. FIG. 2 shows an example of the configuration of the actual pump flow rate control section 5. As shown in FIG. The actual pump flow rate control section 5 includes an actual pump flow rate determining section 11 and a pump operating section 12 .

The pump start/stop water level setting unit 3A sets the first start water level and the first stop water level using the predicted inflow amount.

The pump start/stop command determination unit 4A compares each of the first start water level and the first stop water level with the current water level, and determines whether to start or stop the variable speed pump 101 according to the comparison result. , to output a pump start/stop command indicating start or stop. For example, if the current water level is equal to or higher than the first starting water level, it is decided to start the variable speed pump 101, and if the current water level is equal to or lower than the first stop water level, it is decided to stop the variable speed pump 101.

The pump actual flow rate control unit 5 operates the variable speed pump 101 so that the rainwater in the pump well 100 is discharged (or the discharge is stopped) at the actual flow rate corresponding to the pump flow rate according to the pump start/stop command. Control. That is, when the variable speed pump 101 is started according to the pump start/stop command determined by the pump start/stop command determination unit 4A, the actual pump flow rate control unit 5 changes the pump flow rate calculated by the pump flow rate calculation unit 2 to When stopping the variable speed pump 101, the flow rate of 0 m ³ /s is determined as the actual pump flow rate. This determination is made by the actual pump flow rate determination unit 11 shown in FIG. As a result, the variable speed pump 101 is operated at the pump actual flow rate determined by the pump actual flow rate control unit 5, the rainwater flows into the pump well 100 from the rainwater inflow unit 103, and the rainwater stored in the pump well 100 is discharged to the river. be. The above operation is performed by the pump operation section 12 shown in FIG.

(Function to control operation of fixed speed pump 102)
The rain water drainage pump control device 10 also has a fixed speed pump dynamic control section 21B as a function of controlling the operation of the fixed speed pump 102 .

The fixed-speed pump dynamic control section 21B is a function built using a drainage pump dynamic control technology (rainwater pump dynamic control technology). The fixed-speed pump dynamic control unit 21B sets a second start-up water level indicating a water level at which the fixed-speed pump 102 is started and a second stop water level indicating a water level at which the fixed-speed pump 102 is stopped as predicted inflow amount of rainwater flowing into the pump well 100. , and control is performed to determine the actual flow rate of the fixed-speed pump 102 according to the second starting water level and the second stopping water level. The actual flow rate here refers to the flow rate actually applied to the control of the fixed speed pump 102, and is distinguished from the pump rated flow rate (described later) used in the process of determining the flow rate. Specific control in the fixed-speed pump dynamic control section 21B may be realized using the method described in Japanese Patent No. 6261960, for example.

The fixed-speed pump dynamic control unit 21B includes a pump start/stop water level setting unit (second pump start/stop water level setting unit) 3B, a pump start/stop command determination unit (second pump start/stop command determination unit) 4B, and a pump An actual flow controller (second pump actual flow controller) 6 is included. FIG. 2 shows an example of the configuration of the actual pump flow rate control section 6. As shown in FIG. The actual pump flow rate control section 6 includes an actual pump flow rate determining section 11 and a pump operating section 12 .

The pump start/stop water level setting unit 3B sets the second start water level and the second stop water level using the predicted inflow amount.

The pump start/stop command determination unit 4B compares each of the second start water level and the second stop water level with the current water level, and determines whether to start or stop the fixed speed pump 102 according to the comparison result. , to output a pump start/stop command indicating start or stop. For example, if the current water level is equal to or higher than the second start water level, it is determined to start the fixed speed pump 102, while if the current water level is equal to or lower than the second stop water level, it is decided to stop the fixed speed pump 102.

The pump actual flow rate control unit 6 controls the fixed speed pump 102 in accordance with the pump start/stop command so that rainwater in the pump well 100 is discharged (or the discharge is stopped) with the pump rated flow rate as the actual flow rate. do. That is, when starting the fixed speed pump 102 in response to the pump start/stop command from the pump start/stop command determination unit 4B, the pump actual flow control unit 6 sets the rated flow rate of the fixed speed pump 102 to the fixed speed pump 102 is to be stopped, the flow rate of 0 m ³ /s is determined as the actual pump flow rate. This determination is made by the actual pump flow rate determination unit 11 shown in FIG. As a result, the fixed-speed pump 102 is operated at the pump actual flow rate determined by the pump actual flow control section 6, and the rainwater flows into the pump well 100 from the rainwater inflow section 103, and the rainwater stored in the pump well 100 is discharged to the river. be. The above operation is performed by the pump operation section 12 shown in FIG.

In this embodiment, the configuration is exemplified for a rainwater drainage facility in which both the variable speed pump 101 and the fixed speed pump 102 are installed. The invention may be implemented for storm water drainage facilities where fixed speed pumps 102 are not installed. In that case, in FIG. 1, the fixed speed pump 102 and the fixed speed pump dynamic control unit 21B (including the pump start/stop water level setting unit 3B, the pump start/stop command determination unit 4B, and the pump actual flow rate control unit 6) Treat it as if it doesn't exist.

Further, in the configuration shown in FIG. 1, some functions of the variable speed pump dynamic control section 21A and the fixed speed pump dynamic control section 21B may be shared.

FIG. 3 shows an example of a configuration in which some functions of the variable speed pump dynamic control section 21A and the fixed speed pump dynamic control section 21B are shared.

The pump activation/termination water level setting units 3A and 3B shown in FIG. 1 differ in setting targets, but have commonalities in processing. can. Similarly, the pump start/stop command determining units 4A and 4B shown in FIG. 1 also have common processing, so they can be configured as one pump start/stop command determining unit 4 as shown in FIG. By configuring as shown in FIG. 3, efficiency of processing can be improved.

Next, an example of the operation of the rainwater drainage pump control device 10 will be described with reference to the flowcharts of FIGS. 4 and 5. FIG.

As shown in FIG. 4, in the rainwater drainage pump control device 10, the pump actual flow rate is determined for each of the variable speed pump 101 and the fixed speed pump 102 (step S1), and the determined pump actual flow rate is are used to operate the corresponding pump (step S2).
be.

FIG. 5 shows an example of a processing procedure in which the operation shown in FIG. 4 is made more detailed.

As in the case of FIG. 4, a series of processes shown below are performed for each of the variable speed pump 101 and the fixed speed pump 102 .

First, a process of setting the starting water level and the stopping water level using the inflow predicted value is performed for each pump (step S11).

Next, for each pump, the starting water level and the stopping water level are compared with the current water level, and depending on the result of the comparison, it is determined whether to start or stop the pump, and a pump start/stop command indicating starting or stopping is performed (step S12).

If the object to be controlled is the fixed speed pump 102 (YES in step S13), the pump rated flow rate is set to the actual flow rate (step S21), and if the pump start/stop command indicates start (YES in step S22), the pump rated flow rate , a process for activating the fixed-speed pump 102 is performed (step S23). On the other hand, when the pump start/stop command indicates stop (NO in step S22), processing is performed to stop the fixed speed pump 102 at a flow rate of 0 m ³ /s (step S24).

On the other hand, in step S13, if the control target is the variable speed pump 101 (NO in step S13), the water level target value of the pump well 100 and the pump well 100 measured by the water level gauge 104 installed in the pump well 100 Based on the current water level of the variable speed pump 101, processing for calculating the flow rate (pump flow rate) of the variable speed pump 101 is performed by PI control (step S31). Then, when the pump flow rate is set to the actual flow rate (step S32) and the pump start/stop command indicates start (YES in step S33), the variable speed pump 101 is started with the calculated pump flow rate (step S34). . On the other hand, when the pump start/stop command indicates to stop (NO in step S33), processing is performed to stop the variable speed pump 101 at a flow rate of 0 m ³ /s (step S35).

According to the embodiment, even in a pump station that employs variable speed pumps, it is possible to reduce the risk of flooding and reduce the number of times the pump is started and stopped compared to conventional drainage pump control.

For example, after setting the starting water level and stopping water level of the variable speed pump 101 and the fixed speed pump 102 by the pump starting/stopping water level setting unit 3A and the pump starting/stopping water level setting unit 3B, the flow rate of the fixed speed pump 102 is determined. In addition, by performing PI control based on the target water level of the pump well 100 and the current water level of the pump well 100 measured by the water level gauge 104 installed in the pump well 100, the pump flow rate of the variable speed pump 101 can be adjusted. can decide. By controlling the actual flow rate of the variable speed pump 101 using the determined pump flow rate, the necessary minimum pumps are started and stopped at appropriate timing, and the variable speed pump 101 and fixed speed pump 102 are operated at appropriate flow rates. In a pump station that employs the variable speed pump 101 and the fixed speed pump 102, it is possible to suppress the risk of flooding and reduce the number of times the pump is started and stopped compared to conventional drainage pump control.

As detailed above, according to the embodiment, the drainage pump can be efficiently started and stopped.

While several embodiments of the invention have been described, these embodiments have been presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and equivalents thereof.

DESCRIPTION OF SYMBOLS 1... Calculation part 2... Pump flow rate calculation part 3, 3A, 3B... Pump start/stop water level setting part 4, 4A, 4A... Pump start/stop command determination part 5, 6... Pump actual flow rate control part 11... Pump actual flow rate determination unit 12 Pump operation unit 21A Variable speed pump dynamic control unit 21B Fixed speed pump dynamic control unit 100 Pump well 101 Variable speed pump 102 Fixed speed pump 103 ... rainwater inflow part, 104 ... water level gauge.

Claims (7)

A first starting water level indicating a water level for starting a variable speed drainage pump installed in a pump well in a rainwater drainage facility and a first stopping water level indicating a water level for stopping the variable speed drainage pump are set to the inflow amount of rainwater flowing into the pump well. Rain water drainage, comprising a variable speed pump dynamic control unit that performs control to vary according to a predicted value and determine the actual flow rate of the variable speed drainage pump according to the first start water level and the first stop water level. pump controller. further comprising a pump flow rate calculation unit that calculates a pump flow rate corresponding to a flow rate command value for the variable speed drainage pump according to the deviation between the target water level value and the current water level of the pump well;
The variable speed pump dynamic control unit determines the actual flow rate of the variable speed drainage pump according to the pump flow rate.
The rain water drainage pump control device according to claim 1. A second starting water level indicating a water level at which a fixed speed drainage pump installed in the pump well is started and a second stop water level indicating a water level at which the fixed speed drainage pump is stopped are used as the predicted inflow amount of rainwater flowing into the pump well. a fixed-speed pump dynamic control unit that performs control to determine the actual flow rate of the fixed-speed drainage pump according to the second start water level and the second stop water level,
The rainwater drainage pump control device according to claim 1 or 2. The variable speed pump dynamic control unit and the fixed speed pump dynamic control unit share some functions,
The rainwater drainage pump control device according to claim 3. a variable speed sump pump and a fixed speed sump pump installed at a pump well in a stormwater drainage system;
A first starting water level indicating a water level at which the variable speed drainage pump is started and a first stopping water level indicating a water level at which the variable speed drainage pump is stopped are varied according to a predicted value of an inflow amount of rainwater flowing into the pump well; a variable speed pump dynamic control unit that performs control to determine the actual flow rate of the variable speed drainage pump according to the first starting water level and the first stopping water level;
A second starting water level indicating a water level at which the fixed-speed drainage pump is started and a second stopping water level indicating a water level at which the fixed-speed drainage pump is stopped are varied according to the predicted inflow amount of rainwater flowing into the pump well, A storm water drainage system, comprising: a fixed speed pump dynamic control unit for controlling to determine an actual flow rate of said fixed speed drainage pump according to a second starting water level and said second stopping water level. The variable-speed pump dynamic control unit controls the starting water level indicating the water level at which the variable-speed drainage pump installed in the pump well in the rainwater drainage facility is started and the stop water level indicating the water level at which the variable-speed drainage pump is stopped, according to the rainwater flowing into the pump well. and performing control to determine the actual flow rate of the variable speed drainage pump according to the start water level and the stop water level. to the computer,
A starting water level indicating a water level for starting a variable speed drainage pump installed in a pump well in a rainwater drainage facility and a stopping water level indicating a water level for stopping the variable speed drainage pump are varied according to the predicted value of the inflow amount of rainwater flowing into the pump well. A program for realizing a control function for determining the actual flow rate of the variable-speed drainage pump according to the starting water level and the stopping water level.

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