KR20090060600A - Method for controlling valve of water reservoir - Google Patents

Abstract

A method for controlling an inlet valve of a water reservoir is provided to control the inlet valve in stages so as to prevent the sudden operation of the inlet valve, and to prevent the mechanical damage of the inlet valve by setting the target water level, flow rate and valve opening degree. A method for controlling an inlet valve of a water reservoir comprises a step of measuring the water level or flow rate of the water reservoir in real time to obtain an instantaneous change value of water level or flow rate, a step of determining deviation of driving range that the instantaneous change value of the water reservoir exceeds the maximum operating signal standard value(C-1) of the inlet valve set to the driving range or falls below the minimum operating signal standard value(C-2), and a step of lowering the opening degree of the inlet valve above the minimum valve opening degree(C-5) in case of excess of the maximum operating signal standard value and increasing the opening degree of the inlet valve under the maximum valve opening degree(C-4) in case of falling below the minimum operating signal standard value.

Description

{Method for controlling valve of water reservoir}

The present invention relates to a method for controlling an inlet valve of a unit business reservoir, and more particularly, an inlet valve for controlling the amount of water flowing into a unit business reservoir such as a water tap, an absorption well, a control basin, and a drainage basin. The present invention relates to a control method of an inlet valve of a unit business storage station to control the water level in the storage unit by controlling the unit level according to the water level or the flow rate.

Each unit of a water facility stores the water supplied from the outside in the reservoir and then flows out.

Figure 1 shows a flow chart of the flow of water supply.

In general, a water supply facility for supplying water to a consumer includes a water intake (1) for collecting raw water, a water purification plant (2) for producing tap water through water treatment, a pressurized pumping station (3) for supplying water to a highland, and water for a consumer. It consists of a drainage basin 4 etc. to supply.

In the water purification plant (2), the impingement well, the pressure pump station (3) serves to temporarily store the water in the absorption well and the control pond, the inlet valve (7) is installed in each unit of the water facility.

The inflow valve 7 of the drainage basin 4 determines the inflow flow rate in consideration of the drainage amount of the drainage basin 4, and the absorption well and the control basin inflow valve 7 of the pressurization pumping station 3 are pressurized pumping station 3. The inflow flow rate is determined and operated in consideration of the supply amount, and the inlet / outflow valve 7 of the water purification plant 2 operates by determining the inflow flow rate in consideration of the water level and the water supply amount.

Inlet valves (7) of such landing wells, absorption wells, control basins and reservoirs (hereinafter collectively referred to as reservoirs) are SCADA (Supervisory Control And Data Acquisiton) (6), PLC (Programmable Logic Controller), Telemeter and Telecontrol (TM). The control panel is equipped with an inlet valve control system such as an MMI (Man Machine Interface) program for controlling the storage inlet valve 7.

The inflow valve 7 is opened and closed by an electric actuator capable of digital control and analog control. The electric actuator is operated by a mode selected by the field control panel.

The inflow valve (7) is operated when the automatic operation conditions are set so that the water level of the reservoir, such as the landing well, the absorption well, the control basin and the drainage reservoir closes to the upper limit and opens when the lower limit is reached, the operation of the inlet valve, the outflow of the reservoir Flow rate feedback control is made to determine the inflow flow rate relative to the flow rate.

However, such a conventional inflow valve control method has a problem in that an overload occurs in a valve electric actuator due to a pressure increase in the pipeline at an opening below an arbitrary limit due to the mechanical characteristics of the inflow valve, thereby causing a torque alarm. there was.

In addition, when the inflow flow rate determining factor set value for securing the storage volume is set based on the outflow flow rate, the flow rate of the reservoir is increased due to the difference between the inflow volume and the outflow volume over time. There have been cases of descent, disrupting operations.

In addition, in case of automatic control of feedback inflow flow rate based on the outflow flow rate, in order to cope with minute outflow flow fluctuations, mechanical damage to the valve electric actuator occurs due to the continuous operation of the inflow valve within a small range of 2-3%. This occurred to shorten the life of the valve.

On the other hand, the automatic control method of the conventional inlet valve using the water level instantaneous value of the reservoir as an automatic control condition and completely opening the inlet valve at the low water level, and closing the inlet valve completely at the water level upper limit, the machine according to the rapid fluctuation of the inflow volume There was a problem of damage and water shock on the pipeline, and it was not possible to set the inflow volume at any time using the current value of the flow rate or the instantaneous value of the inflow valve automatic operation of the reservoir.

The present invention has been proposed in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to control the storage inlet valve by a step unit to prevent a sudden valve operation of the inlet valve, the target flow rate or the target water level And it is to provide a method for controlling the inlet valve of the unit business reservoir to be able to set the valve operation opening to prevent mechanical damage of the inlet valve.

Another object of the present invention is to apply the look-up table method that can be used to set the inflow flow rate target for each hour 24 hours to automatically select the inflow flow for each period to control the inlet valve, according to the characteristics of the reservoir The present invention provides a method of controlling an inlet valve in a unit business reservoir to set an inlet valve operating standard.

Inlet valve control method of the unit business reservoir according to the present invention for achieving the above object is to control the inlet valve for controlling the amount of water flowing into the unit facility reservoir, such as water taps, absorption wells, control ponds and drainage A method for determining the instantaneous change of the water level or flow rate by measuring the water level or flow rate of the unit storage; Checking whether the instantaneous change value of the unit facility reservoir exceeds the inflow valve upper limit operation signal reference value preset to the operation range or falls below the lower limit operation signal reference value to identify an operation range deviation; When the instantaneous change value exceeds the inlet valve upper limit operation signal reference value, the opening degree of the inlet valve is reduced above the lower limit value of the valve opening degree set as the operation range, and when the inflow valve lower than the inlet valve lower limit operation signal reference value falls below the inlet valve limit value. It comprises a; inlet valve adjusting step of increasing the degree of opening.

When the instantaneous change value exceeds the inflow valve upper limit operation signal reference value or falls below the lower limit operation signal reference value and falls out of the operating range, the departure duration time is measured and the departure duration time exceeds the preset departure duration reference time. The opening degree of is controlled.

The inflow valve opening is increased or decreased at a preset one-time valve opening step interval. When the opening degree of the inflow valve is increased or decreased once, the valve is continuously operated after maintaining a standby state for a predetermined valve continuous operation prevention time. When the prevention time elapses, it operates repeatedly checking whether the instantaneous change value is out of the operation range.

In addition, when the alarm occurs when the instantaneous change value exceeds the preset upper limit alarm reference value or falls below the lower limit alarm reference value after moving out of the operating range, the alarm duration is measured to determine the alarm duration reference time. If exceeded, the inlet valve is opened by the set maximum opening value or closed by the set minimum opening value.

On the other hand, the inflow valve upper limit operation signal reference value and the lower limit operation signal reference value set as the operation range may be selected and set by the time inflow flow rate according to the look-up table for setting the inflow flow rate target amount for 24 hours.

Inlet valve control method of the unit business reservoir according to the present invention is to control the inlet valve of the water purification plant to prevent the sudden valve operation of the inlet valve, and after the inlet valve is controlled by one step, wait for the valve continuous operation prevention time again By controlling it, there is an effect of preventing breakage of the inlet valve.

In addition, the inflow valve control method of the unit business reservoir according to the present invention enables to automatically select the inflow flow for each period, and by setting the target flow rate or target water level and the valve operation degree of the reservoir directly. According to the characteristics, there is an effect to optimize the operation of the inlet valve.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is an overall control flow diagram of the inlet valve control system according to an embodiment of the present invention.

As shown in Figure 2, the water purification plant (2), pressurized pump station (3), installed in the drainage basin (4) to temporarily store water, water wells and control basin, to adjust the amount of water flowing into the drainage basin An electric inflow valve 7, a flowmeter 8 for measuring the amount of water flowing in, and a water gauge 9 for measuring the water level are provided.

The inflow valve 7, the flow meter 8, and the water level meter 9 are controlled by an on-site control panel 100 for measuring control equipment, and the inlet valve 7, the flow meter 8, and the water level meter 9 are provided on the field control panel 100. It is equipped with an inlet valve control system that includes a control program such as MMI that monitors and controls).

3 is a block diagram of an inlet valve control system mounted on a field control panel according to an exemplary embodiment of the present invention.

As shown in FIG. 3, the inflow valve control system 100 includes a setting display unit 120 for setting and displaying an operating environment of the inflow valve 7, and a flow rate for receiving and monitoring flow rate data from the flowmeter 8 in real time. The monitoring unit 140, the water level monitoring unit 150 for receiving and monitoring the water level data in real time from the water level meter 9, the setting environment of the setting display unit 120 and the flow rate monitoring unit 140 and the water level monitoring unit 150 Inflow valve opening / closing determination unit 160 for determining whether the inflow valve 7 is opened or closed by analyzing the flow rate data and the water level data of the inlet valve 7 and the inlet valve 7 under the control of the inlet valve opening / closing determination unit 160. An inlet valve opening degree control unit 170 for controlling the opening degree, a timer 180 for measuring time, a memory 190 for storing setting data and operation data, and a central control unit 110 for controlling each component are provided. It is.

Figure 4 shows a block diagram of each setting module provided in the setting display unit of the inlet valve control system according to an embodiment of the present invention.

As shown in FIG. 4, the setting display unit 120 includes an operation mode selection module 121, an inflow valve control method selection module 122, an operation center reference value setting module 123, and an upper / lower limit operation signal reference value setting module. (124), the valve opening degree upper and lower limit value setting module 125, the upper and lower limit alarm reference value setting module 126, the escape duration reference time setting module 127, the valve opening degree step interval setting module 128, the valve continuous operation prevention The time setting module 129 and the alarm duration reference time setting module 130 are provided.

The operation mode selection module 121 is a function for selecting an automatic operation mode or a manual operation mode of the inflow valve 7, the automatic operation mode is a mode in which the inlet valve is automatically operated by an automatic control program, the manual operation Means a mode in which the driver operates the inlet valve (7) by direct contact control or opening control.

The inflow valve control method selection module 122 is a function for selecting an inflow valve operation method by contact control or opening control, and the contact control transmits an open / close digital contact signal to the inflow valve actuator to provide an inflow valve (7). The opening degree control is a method of controlling the inlet valve 7 by transmitting an opening degree setting value as an analog signal to the inlet valve actuator.

The operation center reference value setting module 123 is a function of setting a target reference value for automatically operating the water level or the flow rate of the storage, and the upper and lower limit operation signal reference value setting module 124 operates the storage level or the flow rate. It is a function to set the upper limit and lower limit reference values set for the operation within the range. The driver sets the operation center reference value and the upper and lower limit operation signal reference values according to the operating range of the flow rate or the water level in the reservoir, and accordingly the automatic control of the inflow valve 7 so that the flow rate and the water level can be maintained within the set range. Is done. In the method of setting the driving center reference value and the upper / lower limit operation signal reference value through the driving center reference value setting module 123 and the upper / lower limit operation signal reference value setting module 124, the driver directly inputs and sets the reference value and time. There is a method of setting by using the table of target flow rate or water level, and a method of setting the inflow flow target value in proportion to the outflow.

The valve opening degree upper and lower limit value setting module 125 is a function of setting the upper and lower limit set value of the valve opening degree during the automatic operation of the inlet valve (7), the driver is mechanical damage of the inlet valve (7) for each water facility In order to prevent the valve opening, the upper and lower limit values are set so that the operation of the inflow valve 7 is performed within the upper and lower limit set values.

The upper and lower limit alarm reference value setting module 126 is a function of setting a reference value causing trouble in operation because the level or flow rate exceeds the operating range, and the inflow valve (7) when the level or flow rate is out of the upper and lower limit alarm reference values. ) Is controlled to be closed by the set minimum opening value or open by the set maximum opening value.

The release duration reference time setting module 127 is a function for setting a reference time to wait until the inlet valve 7 is operated after the water quantity or the water level is out of the upper and lower limit operation signal reference values. When the inlet valve 7 is out of the lower limit operation signal reference value, the inlet valve 7 waits for the above set departure duration reference time, and if the quantity or level does not return to the upper and lower limit operation signal reference value range within the departure duration reference time, the operation of the inlet valve 7 is performed. This is done.

The valve opening step interval setting module 128 is a function of setting the opening degree which is increased or decreased during one operation of the inlet valve 7, and the inlet valve 7 is increased or decreased by the opening degree set based on the current valve opening. Will decrease.

The valve continuous operation prevention time setting module 129 maintains the current state after one operation of the inlet valve (7) to set the time to wait until the flow of water and the treatment process on the facility and pipeline find a stable state to be.

The alarm duration reference time setting module 130 is a function of setting a reference time to wait until the inlet valve 7 is operated after the water level or the quantity is out of the upper and lower limit alarm reference value. When the inlet valve 7 is out of the lower limit alarm reference value, the inlet valve 7 waits for the set alarm duration reference time, and if the quantity or level does not return within the upper and lower limit alarm reference values within the alarm duration reference time, the inflow valve 7 is operated. .

5 is a control logic conceptual diagram illustrating a process of controlling an inlet valve according to an inlet valve control system according to an exemplary embodiment of the present invention.

As shown in FIG. 5, first, the operation center reference value C-3, the upper limit operation signal reference value C-1, the lower limit operation signal reference value C-2, and the valve opening degree upper limit value C through the setting display unit 120. -4) and valve opening lower limit value (C-5), upper limit alarm reference value (C-18) and lower limit alarm reference value (C-19), release duration reference time (C-13) and alarm duration reference time, valve opening step The interval C-14 (C-16) and the valve continuous operation prevention time (C-17) are set.

After the reference values are set, the water level or flow rate of the reservoir is received in real time from the water level meter 9 and the flow meter 8, and the instantaneous level change line C-15 is a water level meter 9 or a flow meter 8. The instantaneous state change value of the water level or the flow rate of the storage reservoir grasped through the above, and the valve opening degree instantaneous change line (C-6) represents the instantaneous state change value of the controlled inlet valve.

When the level or flow rate instantaneous change line (C-15) is out of the upper limit operation signal reference value (C-1) or the lower limit operation signal reference value (C-2), a deviation signal is generated (C-7) (C-10) (C -12), the exit signal generated when the return to the operating range is released (C-8). That is, when the water level or the flow rate instantaneous change line C-15 is out of the upper limit operation signal reference value C-1, a departure signal is generated (C-7), and the departure sustained out of the upper limit operation signal reference value C-1. If the time is less than the departure duration reference time, the inlet valve is not operated and the current state is maintained and the release signal is terminated (C-9). When the departure signal is released, the departure duration is reset and remeasured at the next departure signal. Even when the water level or the flow rate instantaneous change line C-15 deviates from the lower limit operation signal reference value C-2, the departure signal generation and release are equally applied.

If the upper limit operation signal reference value deviation duration time of the water level or flow rate instantaneous change line (C-15) is greater than the departure duration reference time, the inflow valve is operated (C-10). The preset valve opening in the current inlet valve opening is also reduced by the step interval (C-14).

In addition, when the lower limit operation signal reference value deviation duration time of the water level or flow rate instantaneous change line (C-15) is greater than the departure duration reference time, the inlet valve is increased by a step (C-16). .

On the other hand, if the inflow valve operation is executed once, the preset valve continuous operation prevention time is applied (C-17), and during the valve continuous operation prevention time, the departure duration time is reset and waited and the inflow valve 7 is opened in the current state. Will be maintained. In general, the water flowing into the reservoir is transported using a natural flow or a pressurized pump at a long distance through a water supply pipe, so that a certain time passes after the inlet valve is operated to maintain a stable state. Prevention time is applied.

After the inflow valve is operated once and the valve continuous operation prevention time has elapsed, if the water level or flow rate instantaneous change line (C-15) does not return above the lower limit operation signal reference value (C-2), a new release signal is generated. If the departure duration is measured, and if it does not return normally within the departure duration, the secondary operation is performed in which the inlet valve is increased by the step interval from the current inlet valve opening degree. Even after the secondary operation of the inflow valve, the subsequent process of applying the valve continuous operation prevention time (C-17) is repeated. The opening degree of the inlet valve repeatedly operated at step intervals in the above process is made within the preset upper limit value (C-4) and lower limit value (C-5) of the valve opening to adjust the valve opening degree according to the facility characteristics and pipeline characteristics of the reservoir. Operation to prevent mechanical damage to the inlet valve.

There are two types of inlet valve control methods: contact control and opening control. In the case of double-opening control, the valve repeatedly opens and closes near the target point to find the opening position. In this case, mechanical damage may occur in the case of an inlet valve of a high pressure water reservoir. In order to prevent this, the opening control method can be basically selected as the inflow valve control method.However, if the current opening state instantaneous value of the inflow valve can be known, it can be used as the opening control method as the contact control and to find the opening position in the valve itself. Since it is not necessary to repeat Open and Close near the target point, mechanical damage can be prevented. To this end, in the embodiment of the present invention, after the departure signal is generated, the departure duration time is advanced by the departure duration reference time, and when the valve operation is performed, the open or close operation signal is maintained in the inlet valve as a serial signal for maintaining contact. When the current opening degree instantaneous value of the valve reaches the target value, the operating signal serial signal is released.

On the other hand, when the water level or the flow rate instantaneous change line C-15 is out of the upper and lower limit operation signal reference values C-1 and C-2, and reaches the upper and lower limit alarm reference values C-18 and C-19. After measuring the alarm duration and comparing it with the preset alarm duration reference time, if the alarm status duration is greater than the alarm duration reference time, the valve opening is not applied to the step interval set by the step setting module 128. The opening is opened by the set maximum opening value or closed by the set minimum opening value. This is to remove unnecessary time such as stepwise operation and continuous operation prevention time of the valve in case of an alarm so that the inlet valve can be quickly controlled to return to an appropriate flow rate or level. The maximum opening and closing openings of the inlet valve may be preset by the driver.

Figure 6 shows a control flowchart of the inlet valve according to an embodiment of the present invention.

Step S110: When the system is turned on, the driver first sets the operation mode, the inlet valve control method, and various reference values through the setting display unit 120.

Steps S120 and S200: If the operation mode is the manual mode instead of the automatic mode after checking the operation mode, the driver manually controls the inflow valve 7.

Step S130: When the operation mode is automatic, the water level or quantity is received in real time from the water level meter 9 or the flow meter 8 to measure the amount of change to grasp the water level or flow rate instantaneous change line C-15.

Step S140: When the water level or flow rate instantaneous change line C-15 deviates from the upper limit operation signal reference value or the lower limit operation signal reference value, a departure signal is generated.

Step S150: When the departure signal is generated, the departure duration time is measured and compared with the departure duration reference time.

Step S160: When the departure duration time reaches the departure duration reference time, it is determined whether the valve continuous operation prevention is applied.

Steps S170 and S180: If the valve continuous operation prevention is not applied, the departure duration time is reset (S170), and the opening degree of the inlet valve is operated once at a predetermined valve opening step (S180). If the water level or flow rate instantaneous change line (C-15) exceeds the upper limit operation signal reference value, the inlet valve opening decreases once at the valve step step interval, and the water level or flow rate instantaneous change line (C-15) operates the lower limit. When it falls below the signal reference value, the inlet valve opening is increased once by the valve step.

Step S190: After the inflow valve opening degree is operated once, the valve continuous operation prevention is applied so that the operation of the inlet valve 7 is not performed during the valve continuous operation prevention time.

Step S200: If the system is not terminated, the process returns to step S130 to measure the amount of change in the water level or the flow rate and repeats the subsequent process.

7 is an example of a setting screen of the inlet valve control system applied to the landing well according to an embodiment of the present invention.

As shown in FIG. 7, the driver can set the operation of the inlet valve or check the set environment by selecting each setting item of the setting screen or inputting a setting value.

Operation mode setting (ⓐ), inlet valve control method setting (ⓑ) through the setting screen, the present value of the inlet flow inlet flow rate (ⓒ), the inlet well inlet flow rate (operation center reference value) setting (ⓓ), the inlet well inlet flow rate deadband (Upper / lower limit operation signal reference value) set (ⓔ), set up the inflow flow rate set value (up and down limit value (minimum volume and maximum volume)) set (ⓕ, ⓖ), set operation wait signal (departure duration reference time) when the inflow flow rate ()), Inlet valve inlet valve continuous prevention timer (valve continuous operation prevention time) setting (ⓘ), Inlet valve inlet valve opening change interval (valve opening step interval) setting (ⓙ), Inlet valve inlet valve operation prohibition upper / lower limit value (valve opening upper / lower limit value) ) Setting (ⓚ, ⓛ), Inlet valve opening valve tolerance setting (ⓜ), Initiating well level High alarm set value (upper limit alarm reference value) Setting (ⓝ), Infinity well level Low alarm setpoint (Low limit alarm reference value) can be set (ⓟ), low water level is set when the alarm is set for 30 seconds, the valve opening level (밸브), the low water level indicator (ⓡ), and the inflow control common setting (19) can be set. The inflow control common setting (ⓢ) means setting by inputting the water level target water level and inflow flow rate setpoint for each hour in the lookup table.

FIG. 8 is an example of a screen for inputting a 24-hour purified water target level and an inflow flow rate setting value for each time slot through a common setting according to an embodiment of the present invention.

As shown in Figure 8, this inflow control common to the water level reference water level item (① to adjust the inflow flow rate through the opening and closing of the inlet valve inlet valve to set the water level for each time zone to obtain the target level for each time zone of the purified water) ), And the inflow flow rate table item (②) to input and set the inlet flow rate setpoint for each time slot to allow the inflow valve to be opened and closed according to the set flow rate value, and to calculate the inflow flow rate according to the water level reference level. Flow rate set value calculation formula calculation cycle item (③) and the like.

9 is an example of the monitoring control setting screen using the inlet valve step control based on the absorption constant flow rate or the water level target value according to an embodiment of the present invention.

As shown in Figure 9, the setting screen of the inlet valve control system applied to the absorption well is displayed Remote or Local control selection (ⓐ) of the inlet valve, the control mode selection (ⓢ) is displayed. This control mode selection (ⓢ) includes a flow automatic operation mode for driving the inlet valve opening at the target flow rate setting value, a water level automatic operation mode for operating the inlet valve opening at the target absorption constant level setting value, and an inlet valve with an analog output signal. It is composed of manual opening mode of operation by setting the opening degree of and manual contact mode of operation of opening and closing the inlet valve by digital contact signal.

In addition, it is possible to set the Man method in which the driver directly inputs the set value of the absorption well flow rate, and the Auto method which automatically operates in conjunction with the flow rate of the pressurized pump flow rate (ⓒ). Absorbent well target level setting value (ⓔ) for operating with. In addition, since the setting display contents of FIG. 9 are the same as or similar to those of FIG. 7, descriptions of the respective codes will be omitted.

10 is an example of a screen in which the inlet valve opening degree is controlled in step units according to an embodiment of the present invention, the screen is a step opening diagram so that the inlet valve operation can be excluded mechanical damage by Full Open and Full Close The hysteresis trend (①) is also displayed.

11 is an example of a screen showing that the instantaneous change value of the reservoir level, such as a water tap, an absorption well, a control basin, and a basin, is located within an operating range as a result of the inflow valve control according to an embodiment of the present invention. It can be seen that the reservoir level (①) operates between the upper and lower limits as the operating range target level by the valve opening control.

Thus, through the inlet valve control method of the unit business reservoir according to the present invention can be stably operated between the upper limit and the lower limit of the water level is set.

1 is a flow chart of a conventional water supply system

2 is an overall control flowchart of the inlet valve control system according to the present invention;

3 is a block diagram of an inlet valve control system mounted on a field control panel according to the present invention;

4 is a block diagram of each setting module provided in the setting display unit of the inlet valve control system according to the present invention;

5 is a control logic conceptual diagram illustrating a process of controlling an inlet valve according to an inlet valve control system according to the present invention;

6 is a control flowchart of the inlet valve according to the present invention;

Figure 7 is an example of a setting screen of the inlet valve control system applied to the landing vessel according to an embodiment of the present invention,

8 is an example of a screen for inputting a 24-hour water purifier target water level and an inflow flow rate setting value for each time zone through a common setting according to an embodiment of the present invention.

9 is an example of the monitoring control setting screen using the inlet valve step control based on the absorption constant flow rate or the water level target value according to an embodiment of the present invention;

10 is an example of a screen in which the inlet valve opening degree is controlled in units of steps according to an embodiment of the present invention;

11 is an example of a screen showing that the instantaneous change value of the water reservoir storage level is located within the operating range as a result of the inflow valve control according to an embodiment of the present invention.

Claims (6)

In the method for controlling the inlet valve for regulating the amount of water flowing into the unit storage reservoir, such as water inlet, absorption well, control basin and drainage, Determining an instantaneous change value of the water level or the flow rate by measuring the water level or the flow rate of the unit storage tank in real time; Checking whether the instantaneous change value of the unit facility reservoir exceeds the inflow valve upper limit operation signal reference value preset to the operation range or falls below the lower limit operation signal reference value to determine an operation range deviation; When the instantaneous change value exceeds the inlet valve upper limit operation signal reference value, the opening degree of the inlet valve is reduced above the lower limit value of the valve opening degree set as the operation range, and when the inflow valve lower than the inlet valve lower limit operation signal reference value falls below the inlet valve limit value. Inlet valve control step of increasing the degree of opening; The method of claim 1, When the instantaneous change value exceeds the inflow valve upper limit operation signal reference value or falls below the lower limit operation signal reference value and falls out of the operating range, the departure duration time is measured and the departure duration time exceeds the preset departure duration reference time. Inlet valve control method of the unit business reservoir, characterized in that the opening degree is adjusted. The method of claim 1, The inflow valve opening degree is the inlet valve control method of the unit business reservoir, characterized in that the increase or decrease at a predetermined valve opening step step interval. The method of claim 3, wherein When the opening degree of the inlet valve is increased or decreased once, after maintaining the standby state for the preset valve continuous operation preventing time, it is determined whether the instantaneous change value is out of the operating range when the valve continuous operation preventing time elapses. Inlet valve control method of a unit business reservoir. The method of claim 1, If the alarm occurs when the instantaneous change value exceeds the preset upper limit alarm reference value or falls below the lower limit alarm reference value after the deviation of the operation range, the alarm duration is measured and the alarm duration exceeds the preset alarm duration reference time. In case of inlet valve control method of the unit business reservoir, characterized in that for opening or closing the inlet valve by the set maximum opening value. The method of claim 1, The inflow valve upper limit operation signal reference value and the lower limit operation signal reference value set as the operation range are selected and set according to the time table according to the look-up table for setting the inflow flow rate target for each 24-hour time zone. Valve control method.

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