KR102261684B1 - System and method for controlling deep lift pump and aquifer test method using the same - Google Patents

Abstract

The present invention provides a system and a method for controlling a deep lift pump using a PID controller and an aquifer test method using the same. The system for controlling a deep lift pump comprises: an inverter for controlling an operating frequency of the deep lift pump inserted into a groundwater well; a groundwater level measuring sensor for measuring the level of groundwater in the groundwater well; a digital flow meter for measuring a decrease in a discharge amount due to a drop in the groundwater level; and the PID controller which calculates the frequency of the inverter based on reduction data output from the digital flow meter, and reflects the calculated frequency to the inverter to control the constant pumping of groundwater with a target discharge amount specified by the user. The flow meter reads the decrease in the discharge amount due to the drop in the groundwater level, the PID controller calculates the frequency of the inverter which drives the deep lift pump, and the calculated value is reflected in the inverter to uniformly discharge the groundwater to the target discharge amount specified by the user. Therefore, the user does not need to continuously operate a valve, and the groundwater is constantly discharged, thereby increasing the reliability and accuracy in an aquifer test.

Description

Shenyang pump control system and method, and aquatic test method using the same {SYSTEM AND METHOD FOR CONTROLLING DEEP LIFT PUMP AND AQUIFER TEST METHOD USING THE SAME}

The present invention relates to a deep lift pump control system and method and a logarithmic test method using the same, and more particularly, to a deep lift pump using a proportional-integral-differential controller (hereinafter, PID controller). It relates to a control system and method and a logarithmic test method using the same.

In general, when pumping water from a groundwater well, a drop of the groundwater level (groundwater level) occurs, and at the same time, a change in the water head increases the value of the total head, and the discharge amount, which is inversely proportional to the total head, decreases. Since groundwater is not pumped uniformly, general users cannot accurately determine the amount of groundwater pumped, but also cannot pump the amount of groundwater desired by the user. Usually, a valve is installed in the pumping pipe and the discharge amount is controlled by opening and closing, but this is one of the main factors that cause the pump to fail.

Korea Patent No. 10-1372859 (registration on February 28, 2014) (Scheduled discharge amount control system for pumping water test) Korea Patent Registration No. 10-1242719 (Registered on Mar. 06, 2013) (Underground water deep well aquifer irradiator and investigation method using the same) Korea Patent No. 10-1205445 (Registered on Nov. 21, 2012) (Apparatus and method for groundwater pumping test) Korea Patent No. 10-0300305 (registered on Jun. 15, 2001) (Pressure water pump device and its control system and control method)

Accordingly, the technical problem of the present invention is based on this point, and the object of the present invention is to apply a PID controller and control the frequency of the inverter (the number of rotations of the pump) through the flow rate read from the digital flow meter to control the discharge amount set by the user It is to provide a Shen lift pump control system that can keep it constant.

Another object of the present invention is to provide a method for controlling the pump of the pump using the pump control system described above.

Another object of the present invention is to provide an aquiferity test method for providing important information crucial for accurate hydraulic constant calculation and securing groundwater resources through an actual aquiferous test using the above-described Shenyang pump control system.

In order to achieve the above object of the present invention, a system for controlling a shen lift pump according to an embodiment includes an inverter for adjusting the operating frequency of the shen lift pump inserted into a groundwater well; a groundwater level measuring sensor for measuring the groundwater level in the groundwater well; a digital flow meter that measures a decrease in the discharge amount due to a drop in the groundwater level; and a proportional-integral-differential controller that calculates the frequency of the inverter based on the reduced data output from the digital flow meter, and reflects the calculated frequency to the inverter to control the constant pumping of groundwater with a target discharge amount specified by the user ( Proportional-Integral-Differential controller) (hereinafter referred to as PID controller).

In an embodiment, the Shenyang pump control system may further include a screen unit for displaying a groundwater level change and a current discharge amount so that it can be checked in real time.

In one embodiment, the pump control system for the shen lift may further include a storage unit for storing the extracted groundwater level and the extracted discharge amount.

In one embodiment, the PID controller may include: a pump rotation speed calculator configured to calculate the pump rotation speed of the Shen lift pump through a PID operation based on a real-time measured discharge amount and a target discharge amount; a frequency converter for converting the pump rotation speed into a frequency and providing it to an inverter connected to the Shenyang pump; and a pump driving control unit that starts the operation of the inverter to drive the deep lift pump and provides the target discharge amount to the pump rotation speed calculator.

In one embodiment, the pump driving control unit receives the measured discharge amount from the digital flow meter and operates the deep lift pump based on the pump rotation speed calculated by the pump rotation speed calculation unit through comparison with the target discharge amount. The operation of the pump rotation speed calculator and the frequency converter may be controlled by determining whether to drive or to update the pump rotation speed through the pump rotation speed calculator.

(여기서, Ns은 비속도, Q는 토출량(m²/min), H는 전양정(m))에 의해 산출될 수 있다. In one embodiment, the pump rotation speed (N) is,

(here, Ns is specific velocity, Q is discharge amount (m ² /min), H is total lift (m)).

In order to realize another object of the present invention, a method for controlling a pump of a Shen lift pump according to an embodiment includes (i) a Proportional-Integral-Differential (PID) operation based on a real-time measured discharge amount and a target discharge amount input by a user. Calculating the pump rotation speed of the Shen lift pump; (ii) converting the pump rotation speed into a frequency; (iii) inputting the frequency to an inverter that adjusts the operating frequency of the pump; (iv) checking whether the current discharge amount and the target discharge amount are the same; (v) when it is checked that the current discharge amount and the target discharge amount are different from the step (v), feeding back to the calculating step (i) of the pump rotation speed; (vi) checking whether a pump operation end request is made when the current flow rate is checked to be the same as the target discharge amount in step (v); and (vii) terminating the pump driving when the pump driving end request is checked in step (vi), and feeding back to the step of displaying the current flow rate when the pump driving terminating request is unchecked.

In an embodiment, the method for controlling the deep lift pump may further include, subsequent to step (iii), displaying a current discharge amount pumped according to the driving of the deep lift pump.

(여기서, Ns은 비속도, Q는 토출량(m²/min), H는 전양정(m))에 의해 산출될 수 있다. In one embodiment, the pump rotation speed (N) is,

(here, Ns is specific velocity, Q is discharge amount (m ² /min), H is total lift (m)).

In order to realize another object of the present invention, the logarithmic test method according to an embodiment includes the steps of: (a) maintaining the deep lift pump in a stopped state, and receiving a target discharge amount by a user in advance; (b) receiving the current discharge amount measured in real time from the digital flow meter; (c) calculating a pump rotation speed of the Shen-lift pump by performing a PID operation based on the current discharge amount and the target discharge amount; (d) converting the pump rotation speed into a frequency unit; (e) controlling the driving of the deep lift pump by inputting the converted frequency to an inverter; (f) the groundwater is pumped according to the driving of the Shenyang pump, and displaying the current discharge amount of the pumped groundwater through the screen unit; (g) feeding back to step (c) if the displayed current discharge amount is different from the target discharge amount, and checking whether the groundwater level and discharge amount are measured if the current discharge amount is the same as the target discharge amount; and (h) ending when it is checked that the groundwater level and the discharge amount are not measured, and when it is checked that the groundwater level and the discharge amount are measured, extracting and recording the groundwater level value and the discharge amount.

In one embodiment, the step (b) may include: (b-1) calculating the pump rotation speed of the Shen lift pump through a PID operation based on the current discharge amount and the target discharge amount; (b-2) converting the pump rotation speed into a frequency; (b-3) inputting the converted frequency to an inverter to drive the deep lift pump; and (b-4) after driving the deep lift pump, comparing the current discharge amount with the target discharge amount, and if it is checked that the current discharge amount is different from the target discharge amount, it is fed back to the step (b-1) of calculating the pump rotation speed may include the step of

According to this Shen lift pump control system and method and the logarithmic test method using the same, the flow meter reads the decrease in the discharge amount due to the drop in the groundwater level, the PID controller calculates the frequency of the inverter that drives the Shen lift pump, and the calculated The value is reflected in the inverter, and it is constantly discharged at the target discharge amount specified by the user. Therefore, the user does not need to continuously operate the valve, and the groundwater is constantly discharged, thereby improving reliability and accuracy in the logarithmic test. In addition, as the groundwater level sensor is connected, it is possible to check the groundwater level change and the current discharge amount in real time through the screen and save it as a document.

1 is a configuration diagram for explaining a deep lift pump control system according to an embodiment of the present invention.
FIG. 2 is a block diagram schematically illustrating the PID controller system shown in FIG. 1 .
3A is a graph showing an example of a response curve that changes with respect to a variable of a proportional term, FIG. 3B is a graph showing an example of a response curve that changes with a variable of a proportional term and an integral term, and FIG. 3C is a graph showing an example of a proportional, integral, and differential term These are graphs showing an example of a response curve that changes with a variable.
4 is a plan view for explaining an example of the screen unit of the pump control system according to an embodiment of the present invention.
5 is a flowchart for explaining a method for controlling a deep lift pump according to an embodiment of the present invention.
6 is a graph showing an example of a relationship graph between the discharge amount and the total head of a typical deep lift pump provided by a pump manufacturer.
7 is a flowchart for explaining a logarithmic test method using a deep lift pump control system according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, the present invention will be described in more detail. Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In describing each figure, like reference numerals have been used for like elements. In the accompanying drawings, the dimensions of the structures are enlarged than the actual size for clarity of the present invention.

Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprise" or "have" are intended to designate that a feature, number, step, operation, component, part, or a combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof.

In addition, unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted in an ideal or excessively formal meaning unless explicitly defined in the present application. does not

1 is a configuration diagram for explaining a deep lift pump control system according to an embodiment of the present invention. FIG. 2 is a block diagram schematically illustrating the PID controller system shown in FIG. 1 .

1 and 2 , the Shen lift pump control system according to an embodiment of the present invention includes a Shen lift pump 110 , a groundwater level sensor 120 , a digital flow meter 130 , and a proportional-integral-differential controller ( and a Proportional-Integral-Differential controller (hereinafter referred to as a PID controller) 140 .

The Shenyang well pump 110 is disposed below the groundwater well. An inverter 112 for adjusting the operating frequency of the shen lift pump 110 is connected to the shen lift pump 110 . Accordingly, the shear pump 110 pumps different amounts of groundwater in response to the operating frequency supplied from the inverter 112 .

The groundwater level sensor 120 is disposed near the Shenyang pump 110 , measures the groundwater level and provides the measured water level data to the PID controller 140 . The groundwater level may be measured based on the pressure of the groundwater.

The digital flow meter 130 is disposed in the discharge pipe to measure the flow rate of groundwater discharged through the discharge pipe, and provides the measured flow data (ie, the measured discharge amount) to the PID controller 140 .

The PID controller 140 includes a pump rotation speed calculation unit 142 , a frequency conversion unit 144 , and a pump drive control unit 146 , and based on the reduced data output from the digital flow meter 130 , the inverter 112 . The frequency is calculated, and the calculated frequency is reflected in the inverter 112 to control the constant pumping of groundwater with a target discharge amount specified by the user.

The pump rotation speed calculator 142 calculates the pump rotation speed of the Shen lift pump 110 through PID calculation based on the real-time measured discharge amount and the target discharge amount.

As shown in Equation 1 below, the control value (MV) by the PID operation is a proportional term that controls in proportion to the magnitude of the error value between the real-time measured discharge amount and the target discharge amount in the current state, and the action of eliminating the steady-state error It is defined as the sum of the integral term that performs , and the differential term that reduces overshoot and improves stability by braking the sudden change in output value. In this embodiment, the error value in the current state is the difference between the target discharge amount and the current discharge amount.

[Formula 1]

Here, Kp, Ki and Kd are gain values or gains.

The proportional term reduces the control amount by the error value. That is, the larger the error, the greater the control amount, and the smaller the error, the smaller the control amount. The proportional control value is a parameter that determines the degree to which the real-time measured discharge amount reaches the target discharge amount. If the value is too low, the time to reach the target value becomes slow. values occur in a wide range.

3A is a graph showing an example of a response curve that changes with respect to a variable of a proportional term. Referring to FIG. 3A , if it is assumed that the target set value (=target discharge amount) is 1, when the variable Kp value of the proportional term is 2, the target discharge amount is reached with a small vibration waveform, but the time to reach the target discharge amount is slow, whereas the Kp value When this value is 5, the vibration is greater than when the Kp value is low, but the target discharge amount is reached faster.

On the other hand, the integral term uses the proportional value of the error and the accumulated value of the error as a control amount to lower the error, which is a problem of proportional control. When the integral control value is small, reaching the target discharge amount is slow, but tends to stabilize quickly with little vibration. When the integral control value is large, reaching the target discharge amount is fast but shows a large vibration control amount.

3B is a graph showing an example of a response curve that changes with respect to variables of a proportional term and an integral term. Referring to FIG. 3B , assuming that the target set value (=target discharge amount) is 1, the proportional term variable Kp value is 5 and the integral term variable Ki value is 1.1 and 3, respectively. When this value is small, the waveform of the vibration is small, but the time to reach the target discharge amount is long. On the other hand, when the Ki value is 3, the vibration is large but the target discharge amount is reached quickly.

On the other hand, the differential term is controlled by predicting a future value by calculating the error change rate and adding the result to the output. When all of the proportional term, the integral term, and the derivative term are used, the reaction rate is very fast.

3C is a graph showing an example of a response curve that changes with respect to variables of a proportional term, an integral term, and a differential term. Referring to FIG. 3C , when it is assumed that the target set value (= target discharge amount) is 1, when the variable Kp value of the proportional term is 5 and the variable Ki value of the integral term is 3, the comparison according to the difference in the Kd value of the variable Kd of the derivative term As shown in the figure, when the Kd value is small, the vibration waveform is large and the time to reach the target discharge amount is long, whereas when the Kd value is 3, the vibration is small, but the target discharge amount is reached quickly.

The relationship between total lift, discharge amount, and pump rotation speed can be solved by the specific speed formula. Specific speed (Ns) is a value calculated by the numerical value at the highest efficiency point of a certain pump and is defined by Equation 2 below.

[Formula 2]

(여기서, N은 펌프 회전수(RPM), Q는 토출량(m²/min), H는 전양정(m))

(Where N is the pump rotation speed (RPM), Q is the discharge amount (m ² /min), H is the total lift (m))

Assuming that Ns is 1 in Equation 2 above, the discharge amount (Q) requested by the user becomes a fixed value, and when the total lift value increases due to the drop of the groundwater level (or the groundwater level) by positive water, the pump rotation speed As the value increases, the specific speed must be maintained. At this time, the device according to the present invention controls the pump rotation speed to continuously control the pump rotation speed so that the pump can be pumped according to the discharge amount Q required by the user, even if the total lift value H is changed.

The pump rotation speed (N) according to the present invention can be calculated by Equation 3 below.

[Equation 3]

(여기서, Ns은 비속도, Q는 토출량(m²/min), H는 전양정(m))

(Where Ns is specific velocity, Q is discharge amount (m ² /min), H is total head (m))

The frequency converter 144 converts the pump rotation speed into a frequency and provides it to the inverter 112 connected to the shen lift pump 110 .

The pump driving control unit 146 starts the operation of the inverter 112 to drive the deep lift pump, and provides the target discharge amount to the pump rotation speed calculation unit 142 . In addition, the pump driving control unit 146 receives the measured discharge amount from the digital flow meter 130 and compares it with the target discharge amount, based on the pump rotation speed calculated in advance by the pump rotation speed calculation unit 142 , the pump 110 . ) or whether to update the pump rotation speed through the pump rotation speed calculation unit 142 to control the operation of the pump rotation speed calculation unit 142 and the frequency converter 144.

Shenyang pump control system according to an embodiment of the present invention is a screen unit 200 for displaying the groundwater level change and the current discharge amount so that it can be checked in real time, and a storage unit 300 for storing the extracted groundwater level and the extracted discharge amount ) may be further included.

4 is a plan view for explaining an example of the screen unit of the pump control system according to an embodiment of the present invention.

Referring to FIG. 4 , on the screen unit 300 , a Shen lift pump control start/end button 210 , a target flow rate input window 220 , and a discharge flow rate display window displaying the current flow rate value (l/min) being discharged (230), a water level display window 240 for displaying the groundwater level (m) of the current well, a mode selection window 250 for selecting a linear mode or a step mode, a step positive water setting window 260, the groundwater level compared to the current flow rate A graph display window 270 for displaying a linear graph is displayed.

The values read from the groundwater level measurement sensor and the digital flow meter are continuously displayed on the discharge flow rate display window 230 and the water level display window 240 , and the user inputs the desired amount of pumped water through the target flow rate value input window 220 .

The pump can be driven/stopped by the Start/Stop button of the Shimyangjeong pump control start/stop button 210, and the values of the discharge flow rate display window 230 and the water level display window 240 in the graph display window 270 are displayed in a time series graph. is displayed

The linear mode selected through the mode selection window 250 is a basic operation mode, and the step mode may determine the amount of pumped water and the operation time required for each section.

The step pumping water setting window 260 is activated when the step mode is selected in the mode selection window 250, and is an area for inputting the required amount of pumping water and operating time according to the section in a table form.

5 is a flowchart for explaining a method for controlling a deep lift pump according to an embodiment of the present invention.

1 to 5 , the PID controller 140 receives the measured discharge amount measured in real time from the digital flow meter 130 (step S100).

6 is a graph showing an example of a relationship graph between the discharge amount and the total head of a typical deep lift pump provided by a pump manufacturer. As shown in Figure 6, in the case of pump 4G, the discharge amount (Q) is maintained at 80 [l/min] until the total lift (H) is 80 meters, and the total lift (H) gradually decreases from 80 meters, and the total lift (H) has a characteristic of rapidly decreasing from 270 meters.

In the case of pump 4H, the discharge amount (Q) maintains 120 [l/min] until the total lift (H) is 100 meters, then the total lift (H) decreases gradually from 100 meters, and the total lift decreases rapidly from 300 meters. have.

In the case of pump 4M, the discharge amount (Q) is maintained at 200 [l/min] until the total lift (H) is 50 meters, then the total lift (H) decreases gradually from 100 meters and the total lift decreases rapidly from 150 meters. have.

In this way, in the case of pump 6M, the discharge amount (Q) is maintained at approximately 500 [l/min] until the total lift (H) is 100 meters, then the total lift (H) decreases gradually from 100 meters, and at 430 meters, 80 [ l/min].

As such, the formula described in Equation 1 is referred to as a graph of the inverse relationship between the discharge amount (Q) and the total lift (H) of the pump pump provided by the pump manufacturer. Taking the area corresponding to 4H as an example, when the total lift (H) of the y-axis is 50 m, the discharge amount (Q) of the x-axis can be positive at 100 L/min or more, but when the total lift (H) exceeds 200 m, approximately It is pumped with a discharge amount (Q) of 80 L/min or less. And when the total lift (H) is 300m or more, the discharge amount (Q) value is rapidly reduced, and the discharge amount (Q) is pumped in the range of 0 to 60L/min.

1 to 5 again, the PID controller 140 receives the target discharge amount information input by the user (step S110). In this embodiment, the target discharge amount information is received by the user after receiving the real-time measured discharge amount information, but after receiving the target discharge amount information by the user, the real-time measured discharge amount information may be received, You can also receive them at the same time.

The PID controller 140 calculates the pump rotation speed of the Shen lift pump by performing a PID operation based on the real-time measured discharge amount information and the target discharge amount information input by the user (step S120 ).

The PID controller 140 converts the pump rotation speed into a frequency unit (step S130).

The PID controller 140 inputs the converted frequency to the inverter 112 to control the driving of the shear pump 110 (step S140).

Groundwater is pumped according to the operation of the Shenyang pump 110 , and the PID controller 140 displays the current discharge amount of the pumped groundwater through the screen unit 200 (step S150 ).

The PID controller 140 checks whether the current discharge amount displayed in step S150 is the same as the target discharge amount input by the user in step S110 (step S160).

If it is determined in step S160 that the current discharge amount is not the same as the target discharge amount, the PID controller 140 performs a PID operation based on the real-time measured discharge amount information and the target discharge amount information input by the user, 110) feeds back to step S120 of calculating the pump rotation speed.

When it is checked that the current discharge amount is equal to the target discharge amount in step S160, the PID controller 140 checks whether the driving end of the shen lift pump 110 is requested (step S170). The end of the driving of the deep lift pump 110 may be requested by the user or may be requested when a certain condition, for example, a pumping time has elapsed or a target total discharge amount is satisfied, etc. .

If it is checked in step S170 that the drive end of the shen lift pump is requested, the PID controller 140 ends the drive of the shen lift pump. If not checked, the PID controller 140 checks whether the current discharge amount and the target discharge amount are the same. Step S160 feedback with

7 is a flowchart for explaining a logarithmic test method using a deep lift pump control system according to an embodiment of the present invention.

1, 2 and 7 , the deep lift pump maintains a stopped state, and the discharge amount is input by the user in advance (step S200).

The discharge amount information measured in real time is received from the digital flow meter 130 (step S202).

The pump rotation speed calculation unit 142 of the PID controller 140 calculates the pump rotation speed of the Shenyang pump by performing a PID operation based on the real-time measured discharge amount information and the target discharge amount information input by the user (step S202).

The frequency converter 144 of the PID controller 140 converts the pump rotation speed into a frequency unit (step S206).

The pump driving control unit 146 of the PID controller 140 inputs the converted frequency to the inverter to control the driving of the shen lift pump (step S208).

Groundwater is pumped according to the operation of the Shenyang pump, and the pump driving control unit 146 of the PID controller 140 displays the current discharge amount of the pumped groundwater through the screen unit 200 (step S210).

The pump driving control unit 146 of the PID controller 140 checks whether the current discharge amount displayed in step S210 is the same as the target discharge amount input by the user in step S200 (step S212).

If it is checked in step S212 that the current discharge amount is not the same as the target discharge amount, a PID operation is performed based on the real-time measured discharge amount information and the target discharge amount information input by the user to calculate the pump rotation speed of the Shen lift pump It feeds back to step S204.

If it is checked in step S212 that the current discharge amount is equal to the target discharge amount, the pump driving control unit 146 of the PID controller 140 checks whether the groundwater level and the discharge amount are measured (step S214).

If it is checked that the groundwater level and the discharge amount are not measured in step S214, it ends, and when it is checked that the groundwater level and the discharge amount are measured, the pump driving control unit 146 of the PID controller 140 extracts the groundwater level value and the discharge amount (step S214) S216).

Next, the pump driving control unit 146 of the PID controller 140 records the measured values, that is, the groundwater level value and the discharge amount in the storage unit 300 (step S218).

Normally, when pumping water from a groundwater well, a drop in the groundwater level (groundwater level) occurs, and at the same time, a phenomenon in which the discharge amount is reduced due to a change in the total head due to a change in the water head occurs. Therefore, although the currently generally conducted logarithmic test is performed by installing a valve and opening and closing a valve without any alternative, it is difficult to maintain a constant discharge amount. However, according to the present invention, the PID controller calculates the frequency of the inverter that drives the Shen lift pump, and the calculated value is reflected in the inverter and discharged to the target discharge amount specified by the user, so the user can continuously operate the valve. There is no need, and groundwater is constantly discharged, which improves reliability and accuracy in logarithmic tests.

As described above, according to the present invention, the PID controller calculates the frequency of the inverter based on the reduction data of the discharge amount output from the digital flow meter, and the calculated value is reflected in the inverter to uniformly discharge the target discharge amount specified by the user. control to be Accordingly, the user does not need to continuously and frequently operate the valve for pumping groundwater, and the groundwater is constantly discharged, thereby improving the reliability and accuracy of the logarithmic test. In addition, it is possible to check the groundwater level change and the current discharge amount in real time through the screen, and to save it as a document.

Although the above has been described with reference to the embodiments, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below You will understand.

110: shenyang pump 112: inverter
120: groundwater level sensor 130: digital flow meter
140: PID controller 142: pump rotation speed calculator
144: frequency conversion unit 146: pump drive control unit

Claims (11)

Inverter for controlling the operating frequency of the pump inserted into the groundwater wells;
a groundwater level measuring sensor for measuring the groundwater level in the groundwater well;
a digital flow meter that measures a decrease in the discharge amount due to a drop in the groundwater level; and
A proportional-integral-differential controller ( Proportional-Integral-Differential controller) (hereinafter referred to as PID controller), wherein the PID controller comprises:
a pump rotation speed calculator for calculating the pump rotation speed (N) of the Shen lift pump through PID calculation based on the real-time measured discharge amount and the target discharge amount;
a frequency converter for converting the pump rotation speed (N) into a frequency and providing it to the inverter connected to the shen lift pump; and
and a pump driving control unit that starts the operation of the inverter to drive the deep lift pump, and provides the target discharge amount to the pump rotation speed calculation unit,
The pump rotation speed (N) is,

(where Ns is specific speed, Q is discharge amount (m ² /min), H is total lift (m)). According to claim 1, Shenyang pump control system, characterized in that it further comprises a screen for displaying the groundwater level change and the current discharge amount so that it can be checked in real time. The system according to claim 1, further comprising a storage unit for storing the extracted groundwater level and the extracted discharge amount. delete The deep lift pump of claim 1, wherein the pump driving control unit receives the measured discharge amount from the digital flow meter and compares it with the target discharge amount based on the pump rotation speed calculated in advance by the pump rotation speed calculator. Shen lift pump control system, characterized in that to control the operation of the pump rotation speed calculation unit and the frequency converter by determining whether to drive or to update the pump rotation speed through the pump rotation speed calculator. delete (i) calculating the pump rotation speed (N) of the Shen lift pump through a Proportional-Integral-Differential (PID) operation based on the real-time measured discharge amount and the target discharge amount input by the user;
(ii) converting the pump rotation speed (N) into a frequency;
(iii) inputting the frequency to an inverter that adjusts the operating frequency of the pump;
(iv) checking whether the current discharge amount and the target discharge amount are the same;
(v) when it is checked that the current discharge amount and the target discharge amount are different from the step (iv), feeding back to the calculating step (i) of the pump rotation speed (N);
(vi) when it is checked that the current flow rate is equal to the target discharge amount in step (iv), checking whether a pump driving end request is made; and
(vii) terminating the pump driving when it is checked as a pump driving end request in step (vi), and feeding back to step (iv) when unchecked as a pump driving terminating request,
The pump rotation speed (N) is,

(Where Ns is specific speed, Q is discharge amount (m ² /min), H is total lift (m)). The method of claim 7 , further comprising, following step (iii), displaying a current discharge amount pumped according to the driving of the deep lift pump. delete (a) maintaining the Shen lift pump in a stopped state, and receiving a target discharge amount by a user in advance;
(b) receiving the current discharge amount measured in real time from the digital flow meter;
(c) calculating the pump rotation speed (N) of the Shen lift pump by performing a PID operation based on the current discharge amount and the target discharge amount;
(d) converting the pump rotation speed (N) into a frequency unit;
(e) controlling the driving of the deep lift pump by inputting the converted frequency to an inverter;
(f) the groundwater is pumped according to the driving of the Shenyang pump, and displaying the current discharge amount of the pumped groundwater through the screen unit;
(g) feeding back to step (c) if the displayed current discharge amount is different from the target discharge amount, and checking whether the groundwater level and the discharge amount are measured if the current discharge amount is the same as the target discharge amount; and
(h) ending when it is checked that the groundwater level and the discharge amount are not measured, and when it is checked that the groundwater level and the discharge amount are measured, extracting and recording the groundwater level value and the discharge amount,
The pump rotation speed (N) is,

(Where Ns is specific velocity, Q is discharge amount (m ² /min), H is total lift (m)).
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