KR101907427B1 - Field multiplexing system of small pump station - Google Patents

Abstract

By changing the communication between the central control room and the small pneumatic system to Ethernet based communication and implementing data backup using the memory module, it is possible to prevent loss of field data even in case of communication error, The present invention relates to a small-scale pneumatic field multiplexing system capable of continuous operation without water supply, and includes a small pneumatic hydraulic pump connected to a central control room for controlling the entire water supply pipe network to transmit and receive data, The small-scale pumping station is connected to the central control room through Ethernet communication to perform data communication, backs up and stores the data collected in the field, and controls the pump in a multiplexing manner by linking automatic control and manual control, To keep the pressure constant And a controller.

Description

Field compacting system of small pump station

Field of the Invention The present invention relates to a small-scale pneumatic field multiplexing system, and more particularly, to an Ethernet-based communication between a central control room and a small pneumatic pneumatic cylinder, and realizes data backup using a memory module, And to a small-scale pneumatic field multiplexing system capable of continuous operation without stopping the motor even in manual operation and automatic operation switching.

Generally, in the highlands and hilly areas where the altitude difference from the flat area is severe, it is impossible to supply water by the water pressure supplied from the water purification plant, and there are many pumping stations for water supply by pressurization.

FIG. 1 is a diagram of a general water supply system. Referring to the system in which constants are transferred from the water intake station 2 to the water reception station 7, the water intake station 2, the water purification station 3, the pumping station 4, A constant is supplied to the customer (7) through a process such as a small scale pumping station (6) -> a customer (7). In this case, the area other than the highland or hilly area does not pass through the small-scale pneumatic field 6, and the custodian 7 is directly connected to the reservoir 5.

Here, the water intake station 2, the water purification plant 3, the pressurization station 4, the reservoir 5, and the small scale pumping station 6 except for the cafeteria 7 are communicatively connected to the central control room 1, Transmits the site data to the central control room (1), and performs a constant processing operation in accordance with the pipe network control of the central control room (1).

The central control room 1 stores data transmitted from each of the water supply facilities, analyzes the status of the water supply facilities, and remotely controls the water supply facilities through communication.

Here, the small-scale pumping station 6 serves to keep the pressure of the constant supplied to the customer 7 constant, and may also be referred to as a line pumping station.

2 is a control construction diagram for controlling the water pipe network between the central control room 1 and the small scale pneumatic field 6. The central control room 1 and the small scale pneumatic field 6 are connected by a wired communication line 8.

The small scale pneumatic field 6 communicates data with the central control room 1 using a modem in a serial communication manner.

The small scale pneumatic field 6 includes an automatic control panel 11 composed of a PLC and a PID controller 12 for controlling the pressure of the constant supplied to the customer 7 to be constant, A manual operation panel 12 for controlling the pressure of the constant, a first and second motors 15 and 16 for driving the pump in accordance with the control of the automatic control panel 11 and the manual control panel 12, And first and second inverters 13 and 14 for adjusting the pressure of the supplied constant.

Here, the first and second motors 15 and 16 and the first and second inverters 13 and 14 are implemented as redundant systems for system stabilization.

The general small scale pneumatic field 6 constructed in this way collects the field data and transmits it to the central control room 1 via the modem. In addition, when the manual operation and the automatic operation are switched, the small scale pressure field 6 stops the motors 15 and 16 temporarily, and controls the motor in such a manner that the motor is restarted once the transfer is completed.

If the PLC is upgraded or replaced with another product due to a fault in the PLC, an upgrade or program installation is performed by connecting the PLC and the PC and downloading the program to the PLC.

On the other hand, a conventional constant control system for waterworks pipe network control is disclosed in Patent Documents 1 to 4 below.

In the prior art disclosed in Patent Document 1, in order to efficiently connect and utilize condition monitoring data of a pressurized water supply facility which can be confirmed only in the field, a pressurized water supply station is provided with a hydraulic information transmission control unit, In order to store, manage, and analyze data, a portable personal information communication terminal (PDA) is provided in order to monitor a water supply operation management server and a pressurized water supply facility remotely in real time.

With this configuration, the operation status of the pressurized water supply facility, which can be confirmed only within the pumping area, can be grasped and checked at the remote sites other than the pressurized water supply site by using the PDA. Thus, based on the water supply operation analysis algorithm, Control and pressure control.

The conventional art disclosed in Patent Document 2 stores the set pressure, the upper limit pressure, the lower limit pressure, and the pressure conversion constant of the water pipe for supplying water, and when the pressure sensor connected to the water pipe does not operate normally, Measuring the current, the voltage and the power, and calculating the current pressure of the water pipe using either the current, the voltage or the power of the measured pump and the pressure conversion constant. And performs PID (Proportional Integral Differential) control for comparing the current pressure and the stored set pressure. When the current pressure is equal to or greater than the stored set pressure, the driving of the pump is stopped, When the stored set pressure is smaller than the stored set pressure, the PID control and the inverter control are performed so that the present pressure becomes equal to the stored set pressure, thereby controlling the pressurized water supply.

In the prior art disclosed in Patent Document 3, a hydraulic analysis and an optimization integrated simulation are performed based on the demand data produced using the hydraulic analysis data, the optimization setting parameter, and the history data for the optimization calculation, And derive the schedule and hydraulic analysis results.

In addition, the prior art disclosed in Patent Document 4 predicts the supply and demand information of the outflow amount of the waterworks workplace relatively accurately, calculates the operation management schedule for the 24-hour optimum operation, and controls the waterworks business site in real time Water supply and minimum energy costs.

Korean Registered Patent No. 10-0663718 (Registered on December 26, 2006) (Pressurized Water Supply Operating System) Korean Registered Patent No. 10-1314833 (Registered on Mar. 31, 2013) (Pressurized water supply control method, control device and control system thereof) Korean Patent Laid-Open Publication No. 10-2016-0043845 (Published Feb. 26, 2016) (Operation System and Operation Method of Water Supply Network) Korean Patent Laid-Open No. 10-2016-0080101 (Published Jul. 2016) (Waterworks Operation and Management Control System and Control Method Thereof)

However, since the general small-sized pneumatic pressures and the conventional techniques as described above can not collect on-site data when a communication error occurs between the central control room and the small pneumatic control station, the continuous operation can not be implemented because the motor is temporarily stopped when the manual operation and automatic operation are switched. .

In addition, a general small-sized pneumatic pressure and conventional technology have a disadvantage in that data loss or irregularity of the control-side power supply is cut off or the pressure field system is stopped, and when the PLC or PID module trouble occurs, the motor is stopped, There is a drawback that can not be.

In addition, when a product is replaced due to a PLC malfunction, it is inconvenient to download the program by connecting the PC to the PLC, and it is difficult to store the essential data for control (for example, PID data) have.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a data communication system and a data communication method, And to provide a small-scale pneumatic field multiplexing system capable of preventing loss of field data even when an abnormality occurs and allowing continuous operation without stopping the motor even in manual operation and automatic operation switching.

It is another object of the present invention to provide a small-scale pneumatic field multiplexing system capable of stabilizing the power input to the controller and multiplexing the pump control so that continuous operation can be achieved without stopping the motor even when a problem occurs in one controller .

It is another object of the present invention to provide a small-scale pneumatic field multiplexing system capable of downloading a program without a PC connection even when a PLC is replaced and allowing important data to be backed up in a PLC.

In order to achieve the above object, the small-scale pneumatic field multiplexing system according to the present invention includes a small-sized pneumatic pressur- ing unit connected to a central control room for controlling the whole water distribution network and transmitting and receiving data, Including,

The small-scale pumping station is connected to the central control room through Ethernet communication to perform data communication, backs up and stores the data collected in the field, and controls the pump in a multiplexing manner by linking automatic control and manual control, To maintain a constant pressure of the fluid.

Wherein the multiple controller comprises: an Ethernet communication module for interfacing data to the central control room through Ethernet communication; a PLC for backing up data collected on site through a memory module; A manual operation panel for generating a pump control signal according to manual operation of a user; And a PID controller for controlling the pump in cooperation with the PLC and the manual operation panel.

In the above, the PLC generates pump control data based on the PID control, and outputs the generated pump control data to the inverter to control the constant pressure.

The PLC is characterized in that a control program is downloaded through the memory module after part replacement or program upgrade.

After performing the PID control, the PLC derives the optimal value for the constant pressure control based on the discharge pressure, PID value, target value, control amount, operation time, pump state, and pump operation information of the constant supplied to the customer .

In the above, the PLC compares the target value and the control amount, extracts a deviation for each point, and calculates an optimal value by calculating a period in which the sum of the squares of the predetermined time intervals is minimum.

The PLC analyzes the trend of the target value and the control amount, compares the trend analysis result with the previously derived pattern, determines that the surrounding environment has changed if a difference of more than the set reference value occurs, And generates an alarm for the first time.

The multiple controller is characterized in that the PLC, the PID controller, and the manual control panel interlock with each other to continuously control the operation without stopping the motor in the automatic operation and the manual operation.

An uninterruptible power supply (UPS) that supplies driving power by receiving three-phase AC power (R, S, T) and maintains power supply for a certain period of time with a power charged in the internal battery during a power failure; And a power supply unit (SMPS) for converting power supplied from the uninterruptible power supply unit into a predetermined DC voltage and supplying the DC voltage.

Further, the small-scale hydraulic pressure plant according to the present invention may further include first and first inverters for driving the motor for operating the pump using any one of the pump control signals output from the PLC, the PID controller, and the manual operation panel .

According to the present invention, it is possible to secure stable communication between the central control room and the small-sized pneumatic control station by changing the central control room and the small-sized pneumatic control station to Ethernet-based communication and implementing data backup using the memory module. It has the advantage of collecting data.

Also, according to the present invention, there is an advantage that continuous operation can be performed without interrupting the motor through interlocking between the PLC, the PID controller, and the manual operation panel even in the manual operation and the automatic operation switching.

Further, according to the present invention, it is possible to stabilize the power input to the controller (multiple controller) by using the uninterruptible power supply, and by multiplexing the controller through the interlocking of the PLC, the PID controller, Even if a problem occurs in the controller, there is an advantage that the continuous operation is performed without stopping the motor.

In addition, according to the present invention, it is possible to download a program using a memory module without connecting a PC even when a PLC is replaced, and important data can be backed up in a PLC.

1 is a diagram of a general water supply system,
FIG. 2 is a block diagram of a conventional small-
FIG. 3 is a block diagram of a small scale pneumatic field multiplexing system according to the present invention,
Fig. 4 is a configuration diagram of a power source device provided in the small-scale pneumatic field of Fig. 3,
FIG. 5 is a conceptual diagram showing a configuration between the PLC of FIG. 3 and an apparatus associated therewith,
FIG. 6 is an exemplary view of the PID controller and its peripheral device of FIG. 3,
Figs. 7 and 8 are a circuit diagram of the first and second inverters of Fig. 3 and their peripheral circuits,
Fig. 9 is a diagram showing an example of trend analysis of a target value and a control amount in the present invention; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a small scale pneumatic field multiplexing system according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

3 is a schematic block diagram of a small scale pneumatic field multiplexing system according to a preferred embodiment of the present invention.

The small scale pneumatic field multiplexing system according to the present invention includes a central control room (1) and a small scale pneumatic field (100).

The central control room 1 serves to control the entire water supply network. The central control room 1 is connected to the small pumping station 100 through Ethernet communication to collect the site data. Based on the collected site data, And transmits a control command to the small scale pneumatic field 100 according to the recognition of the condition of the field facility.

The small scale pneumatic field 100 communicates with the central control room 1 to transmit and receive data and maintain constant pressure of the constant pressure supplied to the customer.

The small scale pneumatic field 100 is connected to the central control room 1 through Ethernet communication to perform data communication, backs up the data collected on the site and stores the data, and controls the pump in a multiplexing manner by linking automatic control and manual control And a multi-controller (110) that keeps constant the pressure of the constant supplied to the customer.

The multiple controller 110 includes an Ethernet communication module for interfacing data with the central control room 1 via Ethernet communication, a PLC 111 for backing up data collected on site through a memory module 114, And a PID controller 112 for controlling the pump in cooperation with the PLC 111 and the manual operation panel 113. The PID controller 112 controls the pump 111 and the PID controller 112. [

The PLC 111 preferably receives the control program through the memory module 114 upon replacement of a component or a program upgrade. The PID controller 111 performs a PID control and then outputs a constant discharge pressure, a PID value, , Constant pressure is controlled by deriving the optimum value for constant pressure control based on the control amount, the operation time, the pump state, and the pump operation information.

Preferably, the PLC 111 compares the target value with the control amount, extracts a deviation for each point, and calculates an optimal value by calculating an interval in which a sum of squares of the deviation of a certain time period is minimum. In addition, the trend of the target value and the control amount is analyzed, the trend analysis result is compared with the previously derived pattern, and when the difference exceeds the set reference value, it is determined that the surrounding environment has changed, .

The small scale pneumatic power source 100 supplies the driving power by receiving three-phase AC power (R, S, T) and supplies power to the uninterruptible power supply (UPS) And a power supply unit (SMPS) 142 for converting the power supplied from the uninterruptible power supply unit 141 into a predetermined DC voltage and supplying the DC voltage. By using the uninterruptible power supply unit 141, it is possible to secure the stability of the power source even when the control-side power source is cut off or irregular.

The small scale pneumatic field 100 may include first and second motors for operating the pump using any one of the pump control signals output from the PLC 111, the PID controller 112 and the manual operation unit 113, And first and second inverters 121 and 122 for driving the first and second inverters 131 and 132, respectively. The first inverter 121 operates the first motor 131 and the second inverter 122 operates the second motor 132.

The operation of the small-scale pneumatic field multiplexing system according to the present invention constructed as above will be described in detail with reference to FIGS. 1 to 9. FIG.

First, the small scale pneumatic field 100 and the central control room 1 are connected by Ethernet communication, and the field data collected by the small scale pneumatic field 100 is transmitted to the central control room 1, Generates control commands for controlling the small scale pneumatic field (100) based on the site data, and transmits the control commands to the small scale pneumatic field (100).

By connecting the small pneumatic pressure chamber 100 and the central control room 1 via Ethernet communication, it is possible to secure stable communication compared to the serial communication using the existing modem.

The small scale pneumatic field 100 interlocks the PLC 111 of the multiple controller 110 with the PID controller 112 and the manual operation panel 113 to maintain the constant pressure of the water supplied to the customer, And supplies the constant to the customer while keeping the pressure of the constant supplied to the customer constant.

5, the PLC 111 includes an input port 111a for connecting a memory module 114 in which a control program and an upgrade program are stored, and a memory module (not shown) via the input port 111a 114), and downloads the control program. If a component is replaced due to a fault in the actual PLC 111, the control program is downloaded after connecting the personal computer (PC) with the PLC 111. In this case, the personal computer is moved to the position of the PLC 111 Or the PLC 111 must be moved to a place where the personal computer is located. In contrast, the present invention uses the memory module 114 so that the control program can be conveniently downloaded to the PLC 111 even when the parts of the PLC 111 (particularly CPU replacement) are replaced.

In addition, by mounting the memory module 114 on the PLC 111 as described above, the PLC 111 backs up the field data collected in the field (in particular, PID data as essential data) to the memory module 114, There is an advantage that data loss can be prevented even when field data can not be transmitted to the central control room 1 due to communication with the central control room 1.

Since the small scale pressure field 100 plays a very important role in maintaining a constant water pressure, it is very important to secure the stability of the input power source.

To this end, as shown in FIG. 4, the present invention always supplies power to the multiple controller 110 stably using an uninterruptible power supply (UPS) 141. When the uninterruptible power supply 141 is used, it is possible to stably supply the power required for driving the system even when the power of the control side is shut off or irregular.

The power supply 142 supplies the power supplied from the uninterruptible power supply unit 141 to a predetermined DC power (+24 V).

4, reference numeral 143 denotes a fan, and reference numeral 144 denotes a door sensor.

The PLC 111 derives a control optimal value for maintaining a constant pressure constant based on various data collected in the course of controlling the constant pressure of the customer, and controls the pump based on the optimum control value.

Here, the PID control value is used for deriving the optimum value.

PID control is basically a form of feedback controller. It compares the output value of a target to be controlled with a reference value or a setpoint to be obtained and calculates deviation And calculates the control value necessary for the control by using this deviation.

It is important to maintain constant water pressure in the water supply network. In order to maintain water pressure, PID control is used for pump control.

PID control considers the control response speed in PI control. It is possible to match the target value with the PI control, but it takes a certain time, and the PID control is added with the differential control to adjust the time to reach the target value. The time for reaching the target value can be shortened by operating the control amount instantaneously, thereby causing an interval in which the operation amount increases sharply.

Accordingly, the present invention derives an optimal value for pump control using data obtained through the PID control.

For example, the PLC 111 performs PID control and then communicates with the field data collecting device in communication. The PLC 111 calculates the discharge pressure, the PID value, the target value, the control amount, the operation time, the pump state, . The acquired data is used as basic data for deriving the optimum value and is used for each operation.

Next, the target value and the control amount data are compared. When the data of the control amount PV is compared with the target value SV as a reference, a section where the sum of the squares of the deviations (E) with respect to the predetermined time is minimum is calculated, The optimal value is derived using Equation (1).

That is, the PID value and the target value in the section where the sum of the squared deviations are minimum are derived.

(AO01-, AO01 +, AO02-, AO02 +) based on the optimum values thus derived, and transmits the pump control signals AO01-, AO02-, and AO02 + to the first and second inverters 121 and 122.

On the other hand, the PLC 111 analyzes the target value and the control amount Trand.

When analyzing the trend of the target value and control amount, if a proper PID value is set, it appears in a certain pattern. When the difference is large compared with the derived values, an alarm is generated.

This can be seen as a change in the surrounding environment (pump failure, leakage, increased water usage, etc.) or as a reason for changing the target value, and an alarm is issued to allow the user to quickly check the status.

It is determined that an abnormality has occurred in the case where the control amount and the target value are similar to each other and an end portion is splashed as shown by an arrow in Fig. Numerically, if the value of [Sigma] E increases in the above section, it is recognized as a change in the surrounding environment and an alarm is generated.

6, the PID controller 112 also generates pump control signals PID-, PID +, PID2-, and PID2 + for maintaining the water pressure constant through feedback control and transmits them to the distributor 153 . Here, the calculation of the pump control value to control the pressure of the constant supplied to the customer from the PID controller 112 is the same as the method of calculating the pump control value by the existing PID controller, so a detailed description thereof will be omitted .

The distributor 153 separates the pump control signal for the first inverter 121 and the second inverter 122, and delivers the pump control signal to each inverter.

In FIG. 6, reference numeral 151 denotes a flow meter for measuring a constant pressure supplied to a customer and transmitting the measured pressure to the PID controller 112 and the PLC 111. Reference numeral 152 denotes a pressure sensor for measuring the pressure of a constant water supplied from a reservoir To the PLC (111).

On the other hand, in the field, the user can operate the manual operation panel 113 to manually control the pump. When the variable volume is adjusted to adjust the constant pressure, the manual operation panel 113 is changed to a pump control signal corresponding to the variable volume, and is output to the first and second inverters 121 and 122.

Herein, as a feature of the present invention, the controllers are multiplexed by interlocking with each other at the time of manual operation (manual operation panel) and automatic operation (PLC, PID controller) so that even if a problem occurs in any one of the controllers, ) 132 without stopping it. In FIG. 3, the first and second inverters 132 and 122 and the first and second motors 131 and 132 are implemented as redundant systems for stabilization of the system. And maintains the standby state.

7 and 8, the signals output from the PLC 111, the PID controller 112 and the manual control panel 113 of the multiple controller 110 for multiplexing the controllers are input to the first and second inverters 110, (121) and (122), respectively.

Since the configurations and operations of the first and second inverters are the same, only the first inverter 121 will be described below.

7, the first inverter 121 receives pump control signals PID- and PID2 output from the PID controller 112 for remote control (REM) and pump control signals PID- and PID2 output from the PLC 111 AO01-, and AO01 +) and the pump control signal VR output from the manual operation panel 113 are input. Here, the principle of pump control is remote control, and manual is used for control only when switching to manual operation.

The three control signals are switched by a switch so that only one of the pump control signals is transmitted to the first inverter 121. Basically, the control of the PLC 111 is first, then the control of the PID controller, and the manual control is the last rank. A pump control signal output from the PLC 111 is basically transmitted to the first inverter 121. When a failure occurs in the PLC 111, a pump control signal of the PID controller 112 is supplied to the first inverter 121 And is transmitted to the first inverter 121. In addition, when the operation is switched from automatic operation to manual operation, the pump control signal output from the manual operation panel 113 is transmitted to the first inverter 121.

The present invention has a merit that the pump control signal is constantly transmitted to the first inverter 121 even when the automatic operation is switched to the manual operation, so that even when the operation is switched, the operation can be continuously maintained without stopping the motor.

Since the present invention uses all of the signals output from the PLC 111, the PID controller 112, and the manual operation panel 113 as described above and selects the signals using the switches, multiplexing by three controllers . ≪ / RTI > The implementation of such multiplexing allows for more stability in pump control.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It is obvious to those who have.

The present invention is applied to a technique for controlling a constant pressure in a small pumping station that maintains a constant water pressure in a water distribution network.

1: central control room
100: Small pneumatic pressure
101: Ethernet Network
110: multiple controller
111: PLC
112: PID controller
113: Manual panel
114: memory module
121, 122: first and second inverters
131, 132: first and second motors

Claims (10)

And a small pumping station connected to a central control room for controlling the entire water supply network to transmit and receive data and to maintain constant pressure of the water supplied to the customer,
The small-scale pumping station is connected to the central control room through Ethernet communication to perform data communication, backs up and stores the data collected in the field, and controls the pump in a multiplexing manner by linking automatic control and manual control, To maintain a constant pressure of the fluid,
Wherein the multiple controller comprises: an Ethernet communication module for interfacing data to the central control room through Ethernet communication; a PLC for backing up data collected on site through a memory module; A manual operation panel for generating a pump control signal according to manual operation of a user; And a PID controller for controlling the pump in cooperation with the PLC and the manual operation panel,
Wherein the PLC has an input port for connecting a memory module storing a control program and an upgrade program, mounting the memory module through the input port, downloading a control program,
Based on the PID value obtained through PID control, the discharge pressure of the constant supplied to the customer through the PID control, the target value, the control amount, the operation time, the pump state, and the pump operation information, Lt; RTI ID = 0.0 >
The PLC analyzes the trend of the target value and the control amount, compares the trend analysis result with the previously derived pattern, determines that the surrounding environment has changed if a difference of more than the set reference value occurs, And generates an alarm.
delete The system of claim 1, wherein the PLC generates pump control data based on PID control and outputs the generated pump control data to the inverter to control the constant pressure.
The small-scale pneumatic field multiplexing system according to claim 1 or claim 3, wherein the PLC is downloaded through the memory module after the component replacement or program upgrade.
delete The PLC calculates the optimum value for the pump control by calculating the interval in which the sum of the squared deviations of a certain time period is calculated by comparing the target value and the control amount to extract the deviation for each point, Small-scale pneumatic field multiplexing system.
delete The small-scale pneumatic field multiplexing system according to claim 1, wherein the PLC is interlocked with the PLC, the PID controller, and the manual operation panel, and continuously controls operation without stopping the motor during automatic operation and manual operation.
The small-scale pneumatic power source according to claim 1, wherein the small-sized pneumatic power source supplies power to the three-phase AC power source (R, S, T) and supplies power to the uninterruptible power supply (UPS) ; Further comprising a power supply unit (SMPS) for converting power supplied from the uninterruptible power supply unit into a predetermined DC voltage and supplying the DC voltage.
The small scale pumping station may further include first and second inverters for driving a motor for operating the pump by using any one of a pump, a PID controller, and a pump control signal output from a manual operation panel. Small - scale pneumatic field multiplexing system.

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