KR20100023984A - Inverter booster pump system and method for controlling thereof - Google Patents

Abstract

PURPOSE: An inverter booster pump system and a control method thereof are provided to improve the operation efficiency of a pump by selecting and operating the pumps according to use flow rate. CONSTITUTION: An inverter booster pump system comprises a third large-capacity pump(13), a fourth large-capacity pump(14), a first small-capacity pump(11), and a second small-capacity pump(12). The first small-capacity pump and the second small-capacity pump have the capacity corresponding to 1/2 of the large-capacity pump capacity. The second large-capacity pump, the fourth large-capacity pump, the first small-capacity pump, and the second small-capacity pump are installed between an intake pipe(21) and a water supply pipe(25) in parallel.

Description

Inverter booster pump system and its control method {INVERTER BOOSTER PUMP SYSTEM AND METHOD FOR CONTROLLING THEREOF}

The present invention provides an inverter booster pump system in which two large capacity pumps and two small capacity pumps having a capacity of 1/2 of the large capacity pumps are installed in parallel between the suction pipe and the water supply pipe, and both the large capacity pump and the small capacity pump are inverter driven. The present invention relates to a control method of an inverter booster pump system capable of automatically determining a stop ratio by introducing an auto tuning concept.

Republic of Korea Patent No. 10-0300305 (registered June 15, 2001) relates to a "pressurized water supply pump device and its control system and control method".

The pressurized water supply pump device includes a control system including at least one small pump connected in parallel with a plurality of standard pumps, and sensing the discharge pressure of the pump and automatically controlling the rotation speed of the pump by an inverter according to the detection signal. The control system and method are controlled to maintain the water supply pressure at all times by adjusting the rotational speed of the motor in the pump by the inverter control according to the discharge water supply amount, and the small pump is operated during the predetermined low flow rate time period. By reducing power consumption, a plurality of standard pumps except small pumps alternately operate in a circulating operation method according to the water supply to extend the life of each pump, and control the operation state and operation method according to the user's setting. Using the telecommunications network, change the setpoint in the control system and And to control the driving situation.

However, since the pressurized water pump and its control system and control method are equipped with the pressurized water pump in the place of use, the user sets the set pressure, does not consider the characteristics of the installed pump, and theoretically determines the stopping ratio. There is a risk of starting and stopping the pump continuously due to the difference between the theoretical stop ratio obtained by the theory and the actual stop ratio by the characteristics of the installed pump. Since it operates only during the time zone, the overall efficiency of the pressurized water pumping device is not greatly increased.

Korean Patent No. 10-0311391 (registered on September 25, 2001) introduces a method of controlling the disconnection operation of an inverter booster pump system.

The segment operation control method of the inverter booster pump system includes a first step of determining an inverter driving lower limit frequency by a relationship between a starting pressure and a lower limit frequency, and a final step of determining a final starting pressure by a relationship between a starting pressure of the first step. Step 2, a third step of comparing the present pressure with the input starting pressure; and a fourth step of maximally increasing the operating frequency of the inverter driving pump if the present pressure is less than the starting pressure; and in the fourth step In the fifth step of increasing the maximum frequency and operating at the maximum flow rate, if the flow rate is higher than the maximum speed, the fifth step of additionally turning on and driving the oldest one of the step driving pumps, and if the current pressure is greater than the starting pressure in the third step, drives the inverter. A sixth step of reducing the operating frequency of the pump to the lower limit frequency determined in the first step; and a lower limit frequency in the sixth step If it is reduced to less than or equal to the seventh step of stopping the oldest one of the step-drive pump one by one, and in the third step, if the current pressure and the starting pressure is the same and this state continues for a certain time, the current frequency and the first An eighth step of comparing the lower limit frequency determined in the step; and a ninth step of compensating the deviation by reducing an arbitrary frequency value from the present frequency when the present frequency is greater than the lower limit frequency and less than the lower limit frequency + f1 Hz in the eighth step. And a tenth step of compensating for the deviation of the current frequency when the current frequency is lower than the lower limit frequency and higher than the lower limit frequency-f2 Hz by an arbitrary frequency value, and in the eighth step, the current frequency is the lower limit frequency. If it is smaller than -f2 Hz for a predetermined time, it is determined as the final disconnection operation state and the eleventh step of stopping the inverter driving pump is performed.

However, the segment operation control method of the inverter booster pump system also does not consider the characteristics of the installed pump, and since the stop ratio is determined by the theoretical formula, the difference between the theoretical stop ratio obtained by the theory and the actual stop ratio by the characteristics of the installed pump. There is a danger that the starting and stopping of the pump may be repeated continuously.

Accordingly, an object of the present invention is that two large capacity pumps and two small capacity pumps having a capacity of 1/2 of the large capacity pump are installed in parallel between the suction pipe and the water supply pipe, and both the large capacity pump and the small capacity pump are driven by the inverter. By selecting and driving the pump for each flow rate in the control panel, an inverter booster pump system capable of improving the operating efficiency of the pump is provided.

Another object of the present invention after the pump is installed, the frequency is sequentially increased to the highest Hz at the node, and stores the HQ curve change characteristic data of each of the installed pumps, when the required set pressure for the application is entered, automatically The present invention relates to a control method of an inverter booster pump system that introduces an auto-tuning concept for setting a stop ratio (lower limit frequency) and stops a pump when a flow rate change of a water supply pipe is 0m ³ / min.

Inverter booster pump system for achieving the above object is the third large capacity pump and the fourth large capacity pump and the first small capacity pump and the second small capacity pump having a half capacity of the large capacity pump and the suction pipe connected to the reservoir and It is installed in parallel between the water supply pipes for supplying water to the place of use, the inverters are respectively installed in the small capacity pump and the large capacity pump, the operation of the inverter is controlled by the control panel, the pressure tank is installed in the water supply pipe, the pressure tank It is characterized in that the sudden change in the water pressure of the water supply pipe is prevented.

In the inverter booster pump system according to the present invention configured as described above, when the discharge flow rate when one large-capacity pump is driven at the maximum horsepower (60 Hz) to 100%, the small capacity pump is 50%, the maximum discharge flow rate,

When the use flow rate is 50% or less, the first small capacity pump is driven,

If the use flow rate exceeds 50% and less than 100%, the operation of the first small capacity pump is stopped, the third large capacity pump is driven,

If the used flow rate exceeds 100% and less than 150%, the first small capacity pump and the large capacity pump are driven simultaneously.

If the use flow rate exceeds 150% and less than 200%, the first small capacity pump being operated is stopped, the third and fourth large capacity pumps are driven,

If the flow rate exceeds 200% and less than 250%, the third and fourth large capacity pumps and the first small capacity pump are driven.

When the use flow rate exceeds 250%, both the third and fourth large capacity pumps and the first and second small capacity pumps are driven.

In addition, the inverter booster pump system according to the present invention, after installing a large capacity pump and a small capacity pump, the frequency in order to sequentially change the highest frequency (60Hz) at the break point of the flow rate of the water supply pipe 0 m ³ / min for each installed pump Auto tuning is performed to obtain the actual HQ performance curve data, and the test data obtained by auto tuning is stored in the control panel. Lower limit frequency) is automatically set.

The control method of the inverter booster pump system according to the present invention

For each of the installed pumps, the frequency is gradually increased to the highest frequency (60Hz) at the node where the flow rate of the water supply pipe is 0 m ³ / min. Wow,

Measuring the current pressure of the water supply pipe, starting the first small capacity pump,

Increasing the drive frequency of the first small capacity pump;

Comparing the driving frequency and the maximum frequency (60 Hz) of the first small capacity pump;

If the driving frequency of the first small capacity pump is equal to or greater than the maximum frequency, driving the third large capacity pump and stopping the first small capacity pump;

Comparing the driving frequency and the maximum frequency of the third large capacity pump;

Starting the first small capacity pump if the driving frequency of the third large capacity pump is greater than or equal to the maximum frequency;

Increasing the drive frequency of the first small capacity pump;

Comparing the driving frequency and the maximum frequency of the first small capacity pump;

If the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, driving the fourth large capacity pump in a state where the third large capacity pump is operated and stopping the first small capacity pump;

Comparing the driving frequency and the maximum frequency of the fourth large capacity pump;

If the driving frequency of the fourth large capacity pump is equal to or greater than the maximum frequency, starting the first small capacity pump in a state where the third and fourth large capacity pumps are driven;

Increasing the drive frequency of the first small capacity pump;

Comparing the driving frequency and the maximum frequency of the first small capacity pump;

Starting the second small capacity pump in a state where the third and fourth large capacity pumps and the first small capacity pump are driven when the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency;

Increasing the frequency of the second small capacity pump;

Comparing the measured pressure and the set pressure of the water supply pipe,

If the measured pressure is less than or equal to the set pressure, returning to increasing the frequency of the second small capacity pump; if the measured pressure is greater than or equal to the set pressure, decreasing the frequency;

Comparing the driving frequency and the lower limit frequency of the second small capacity pump;

If the driving frequency of the second small capacity pump is greater than or equal to the lower limit frequency, the step returns to comparing the measured pressure and the set pressure of the water supply pipe. If the driving frequency of the second small capacity pump is less than or equal to the lower limit frequency, the second small capacity after the set delay time Stopping the pump.

In the control method of the inverter booster pump system according to the present invention, in the step of comparing the driving frequency and the maximum frequency (60 Hz) of the first small capacity pump, if the driving frequency of the first small capacity pump is not greater than the maximum frequency, the measured pressure of the water supply pipe Comparing the set pressure with the

If the measured pressure of the first small capacity pump is not greater than the set pressure, the process returns to increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the drive frequency of the first small capacity pump is Reducing the

Comparing the driving frequency and the lower limit frequency of the first small capacity pump;

If the driving frequency is not greater than the lower limit frequency, the step returns to comparing the driving frequency and the maximum frequency (60 Hz) of the first small capacity pump, and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, 1 characterized in that it further comprises the step of stopping the small capacity pump.

In the control method of the inverter booster pump system according to the present invention, in the step of comparing the driving frequency and the maximum frequency of the large-capacity pump, if the driving frequency of the large-capacity pump is not greater than the maximum frequency, comparing the measured pressure and the set pressure of the water supply pipe Wow,

If the measured pressure of the large-capacity pump is not greater than the set pressure, returning to the step of driving the large-capacity pump; if the measured pressure of the large-capacity pump is greater than the set pressure, reducing the driving frequency of the large-capacity pump;

Comparing the driving frequency and the lower limit frequency of the large capacity pump,

If the driving frequency is not greater than the lower limit frequency, the step returns to comparing the driving frequency of the large capacity pump with the maximum frequency (60 Hz). If the driving frequency of the large capacity pump is smaller than the lower limit frequency, stopping the large capacity pump after the set delay time. It characterized in that it further comprises.

As a result, the inverter booster pump system and its control method according to the present invention can improve the operating efficiency of the pump by selecting and driving the pump according to the flow rate, and after introducing the auto tuning concept to install the pump at the place of use. Even if the set pressure is changed, the stop ratio (lower limit frequency) is automatically calculated.

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

Referring to FIG. 1, the inverter booster pump system according to the present invention includes a third small capacity pump 13 and a fourth large capacity pump 14, a first small capacity pump 11 having a capacity of 1/2 of the large capacity pump, and The second small capacity pump 12 is installed in parallel between the suction pipe 21 connected to the reservoir 22 and the water supply pipe 25 for supplying water to the use place 26, and the small capacity pumps 11 and 12 and the large capacity Inverters 15, 16, 17, and 18 are mounted to the pumps 13 and 14, respectively, and operation of the inverters 15, 16, 17, and 18 is controlled by the control panel 30, and the water supply pipe 25 A pressure tank 35 is installed in the pressure tank 35 to prevent a sudden change in water pressure of the water supply pipe 25 by the pressure tank 35.

The inverter booster pump system according to the present invention configured as described above operates as follows.

For example, when the discharge flow rate when one large-capacity pump 13 or 14 is driven at the maximum horsepower (60 Hz) is 100%, the small displacement pumps 11 and 12 have a maximum discharge flow rate of 50%. The total discharge flow rate is 300%. Therefore, the present invention is based on the flow rate of 300%, the small capacity pump digests the amount by 50% and the large capacity pump digests the flow rate by 100%. (In the present invention, the total discharge flow rate is 300% For example, although described, the total discharge flow rate may be changed when the number of pumps is changed.)

That is, when the use flow rate is 50% or less, the first small capacity pump 11 is driven.

When the use flow rate exceeds 50% and 100% or less, the operation of the first small capacity pump 11 is stopped, and the third large capacity pump 13 is driven.

When the use flow rate exceeds 100% and is 150% or less, the first small capacity pump 11 and the large capacity pump 13 are driven simultaneously.

When the use flow rate exceeds 150% and is 200% or less, the first small capacity pump 11 being operated is stopped, and the third and fourth large capacity pumps 13 and 14 are driven.

When the use flow rate exceeds 200% and is 250% or less, the third and fourth large capacity pumps 13 and 14 and the first small capacity pump 11 are driven.

When the use flow rate exceeds 250%, both the third and fourth large capacity pumps 13 and 14 and the first and second small capacity pumps 11 and 12 are driven to maintain the set pressure.

 Then, when the use flow rate is reduced and the measured pressure of the water supply pipe 25 exceeds the set pressure, the pumps are stopped in the reverse order of the operation described above, and finally, the first small capacity pump 11 is the inverter 15 By operating for 3 seconds according to the stop ratio (lower limit frequency), it automatically stops without changing the frequency.

2, the inverter booster pump system according to the present invention operated as described above, for example, when the third and fourth large capacity pumps 13 and 14 are 15HP, the first and second small capacity pumps ( 11 and 12) show that when the set pressure is 6.5 bar at 7.5HP, driving the small capacity pump is more efficient and reduces the power consumption than driving it by decreasing the Hz to the set pressure frequency of the large capacity pump. Have

That is, when the use flow rate is 50% or less, when the use flow rate exceeds 100% and 150% or less, and when the use flow rate exceeds 200% and 250% or less, driving a small capacity pump is more than driving a large capacity pump. High efficiency and low power consumption.

Inverter booster pump system according to the present invention configured and operated as described above, after installing the large-capacity pump (13, 14) and the small-capacity pump (11, 12), the flow rate change of the water supply pipe 21 for each pump installed Is gradually increased to the highest frequency (60Hz) at the joint point of 0 m ³ / min, the actual HQ performance curve data is obtained, and the obtained test data is stored in the control panel 30, so When this input was made, the concept of autotuning for automatically obtaining and setting the stop ratio (lower limit frequency) from the stored test data was introduced.

In general, each pump manufacturing characteristic has a difference between the HQ performance curve data obtained by the actual test installed in the place of use and the theoretical HQ performance curve data calculated by the formula, and the stop according to the HQ performance curve data obtained through the test. The ratio (lower limit frequency) and the stop ratio (lower limit frequency) according to the theoretical HQ performance curve data are also different, which may cause the pump to malfunction or stop and continue to repeat the operation near the point of failure. If you change the value, you need to enter the stop ratio (lower limit frequency).

However, the present invention can obtain the actual HQ performance curve data of the first small capacity pump through autotuning (see FIG. 3), thereby preventing the pump from malfunctioning and error, as well as preventing operation errors. Even when the pressure is changed, the stop ratio (lower limit frequency) can be calculated and set automatically.

3 is only an example of autotuning one small capacity pump, and the H-Q performance curve data has different data values according to the characteristics of the pump.

4 to 11, the control method of the inverter booster pump system according to the present invention is ready to operate by autotuning each installed pump (S101). At this time, the control panel can obtain the H-Q curve change data for each pump installed by the auto tuning, it is possible to calculate the stop ratio (lower limit frequency) according to the test data obtained and the set pressure input by the user.

Thereafter, the current pressure of the water supply pipe is measured, and the first small capacity pump is started (S102). Here, the measured pressure cannot be higher than the set pressure, but in case of emergency, the measured pressure and the set pressure can be compared before starting the first small capacity pump.

Thereafter, the driving frequency of the first small capacity pump is increased (S103), and the driving frequency and the maximum frequency (60 Hz) of the first small capacity pump are compared (S104).

If the driving frequency of the first small capacity pump is equal to or greater than the maximum frequency, the third large capacity pump is driven to stop the first small capacity pump (S105). At this time, the frequency of the third large capacity pump is sequentially increased by its inverter, and the frequency of the first small capacity pump is sequentially decreased while the frequency of the third large capacity pump is increased, so that the frequency of the third large capacity pump is set to use. When the pressure is reached, the first small capacity pump is stopped.

Thereafter, the driving frequency and the maximum frequency of the third large capacity pump are compared (S106).

If the driving frequency of the third large capacity pump is equal to or greater than the maximum frequency, the first small capacity pump is started (S107).

Thereafter, the driving frequency of the first small capacity pump is increased (S108), and the driving frequency and the maximum frequency of the first small capacity pump are compared (S109).

If the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, the fourth large capacity pump is driven while the third large capacity pump is operated, and the first small capacity pump is stopped (S110). At this time, the fourth large capacity pump is sequentially increased in frequency by its inverter, while the frequency of the first small capacity pump is sequentially decreased while the frequency of the fourth large capacity pump is increased, the frequency of the fourth large capacity pump is set to use. When the pressure is reached, the first small capacity pump is stopped.

Thereafter, the driving frequency and the maximum frequency of the fourth large capacity pump are compared (S111).

If the driving frequency of the fourth large capacity pump is greater than or equal to the maximum frequency, the first small capacity pump is started in a state where the third and fourth large capacity pumps are driven (S112).

Thereafter, the driving frequency of the first small capacity pump is increased (S113), and the driving frequency and the maximum frequency of the first small capacity pump are compared (S114).

If the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, the second small capacity pump is started in a state in which the third and fourth large capacity pumps and the first small capacity pump are driven (S115).

Then, increase the frequency of the second small capacity pump (S116), and compares the measured pressure and the set pressure of the water supply pipe (S117).

When the measured pressure is less than or equal to the set pressure, the flow returns to the step of increasing the frequency of the second small capacity pump. When the measured pressure is greater than or equal to the set pressure, the frequency is reduced (S118), and the driving frequency and the lower limit frequency of the second small capacity pump are increased. Compare (S119).

If the driving frequency of the second small capacity pump is greater than or equal to the lower limit frequency, the process returns to step S117 of comparing the measured pressure and the set pressure of the water supply pipe, and if the driving frequency of the second small capacity pump is less than or equal to the lower limit frequency, after the set delay time The second small capacity pump is stopped (S120).

Referring to FIG. 7, in the step S104 of comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), if the driving frequency of the first small capacity pump is not greater than the maximum frequency, the measured pressure and the set pressure of the water supply pipe Is compared (S201).

If the measured pressure of the first small capacity pump is not greater than the set pressure, the flow returns to step S103 of increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the first small capacity pump Reduce the driving frequency of (S202).

Thereafter, the driving frequency and the lower limit frequency of the first small capacity pump are compared (S203).

If the driving frequency is not greater than the lower limit frequency, the process returns to step S104 of comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, a setting delay After the time, the first small capacity pump is stopped (S204).

Referring to FIG. 8, in the step S106 of comparing the driving frequency and the maximum frequency of the third large capacity pump, if the driving frequency of the third large capacity pump is not greater than the maximum frequency, the measured pressure and the set pressure of the water supply pipe are compared. (S301).

If the measured pressure of the third large capacity pump is not greater than the set pressure, the flow returns to step S105 of driving the third large capacity pump, and if the measured pressure of the third large capacity pump is greater than the set pressure, driving of the third large capacity pump Reduce the frequency (S302).

Thereafter, the driving frequency and the lower limit frequency of the third large capacity pump are compared (S303).

If the driving frequency is not greater than the lower limit frequency, the process returns to step S106 of comparing the driving frequency of the third large capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the third large capacity pump is smaller than the lower limit frequency, a setting delay After the time stops the third large capacity pump (S304).

9, in the step S109 of comparing the driving frequency and the maximum frequency of the first small capacity pump, if the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, the measured pressure and the set pressure of the water supply pipe are compared ( S401).

If the measured pressure of the first small capacity pump is not greater than the set pressure, the flow returns to step S108 of increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the first small capacity pump Reduce the driving frequency (S402).

Thereafter, the driving frequency and the lower limit frequency of the first small capacity pump are compared (S403).

If the driving frequency is not greater than the lower limit frequency, the process returns to step S109 comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, a setting delay After the time, the first small capacity pump is stopped (S404).

Referring to FIG. 10, in the step S111 of comparing the driving frequency and the maximum frequency of the fourth large capacity pump, if the driving frequency of the fourth large capacity pump is not greater than the maximum frequency, the measured pressure and the set pressure of the water supply pipe are compared. (S501).

If the measured pressure of the fourth large-capacity pump is not greater than the set pressure, the operation returns to step S110 of driving the fourth large-capacity pump, and if the measured pressure of the fourth large-capacity pump is greater than the set pressure, driving of the fourth large-capacity pump The frequency is reduced (S502).

Thereafter, the driving frequency and the lower limit frequency of the fourth large capacity pump are compared (S503).

If the driving frequency is not greater than the lower limit frequency, the process returns to step S111 of comparing the driving frequency of the fourth large capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the fourth large capacity pump is smaller than the lower limit frequency, the setting delay After 4 hours, the fourth large capacity pump is stopped (S504).

Referring to FIG. 11, in the step S114 of comparing the driving frequency and the maximum frequency of the first small capacity pump, if the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, the measured pressure and the set pressure of the water supply pipe are compared ( S601).

If the measured pressure of the first small capacity pump is not greater than the set pressure, the flow returns to step S113 of increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the first small capacity pump Reduce the driving frequency (S602).

Thereafter, the driving frequency and the lower limit frequency of the first small capacity pump are compared (S603).

If the driving frequency is not greater than the lower limit frequency, the process returns to step S114 comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, a setting delay After the time the first small capacity pump is stopped (S604).

1 is a block diagram showing an inverter booster pump system according to the present invention.

FIG. 2 is a graph of the head (H) -flow (Q) curve for small and large capacity pumps (where the efficiency and power consumption of the pumps were compared).

3 is a graph of a head (H) -flow rate (Q) curve obtained by autotuning of any one small capacity pump.

4 to 11 is a flow chart illustrating a control method of the inverter booster pump system according to the present invention.

Claims (9)

A suction in which a third large capacity pump 13 and a fourth large capacity pump 14 and a first small capacity pump 11 and a second small capacity pump 12 having a half capacity of the large capacity pump are connected to the reservoir 22. It is installed in parallel between the water supply pipe 25 which supplies water to the pipe 21 and the use place 26, and the inverter 15, 16, 17, in the small capacity pumps 11 and 12 and the large capacity pumps 13 and 14; 18 are respectively mounted, the operation of the inverters 15, 16, 17, 18 is controlled by the control panel 30, the pressure tank 35 is installed in the water supply pipe 25, the pressure tank 35 Inverter booster pump system, characterized in that the sudden change in the water pressure of the water supply pipe (25) is prevented. The method of claim 1, When the discharge flow rate when one large-capacity pump 13 or 14 is driven at the maximum horsepower (60 Hz) is 100%, the small displacement pumps 11 and 12 have a maximum discharge flow rate of 50%, When the use flow rate is 50% or less, the first small capacity pump 11 is driven, When the use flow rate exceeds 50% and 100% or less, the operation of the first small capacity pump 11 is stopped, the third large capacity pump 13 is driven, When the use flow rate exceeds 100% and is 150% or less, the first small capacity pump 11 and the large capacity pump 13 are driven simultaneously, When the use flow rate exceeds 150% and is 200% or less, the first small capacity pump 11 being operated is stopped, and the third and fourth large capacity pumps 13 and 14 are driven. When the use flow rate exceeds 200% and is 250% or less, the third and fourth large capacity pumps 13 and 14 and the first small capacity pump 11 are driven. Inverter booster pump system, characterized in that when the flow rate exceeds 250%, both the third and fourth large capacity pumps (13, 14) and the first and second small capacity pumps (11, 12) are driven. The method of claim 1, After the large-capacity pumps 13 and 14 and the small-capacity pumps 11 and 12 are installed, the frequency is sequentially highest at the node where the flow rate change of the water supply pipe 21 is 0 m ³ / min for each of the installed pumps. By increasing to (60Hz), performing auto tuning to obtain the actual HQ performance curve data, and the test data obtained by auto tuning is stored in the control panel 30, and when the required set pressure required for the use is input, the stored test data Inverter booster pump system, characterized in that the stop ratio (lower limit frequency) is set automatically. For each of the installed pumps, the frequency is gradually increased to the highest frequency (60Hz) at the node where the flow rate of the water supply pipe is 0 m ³ / min, and the auto tuning is performed to obtain the actual HQ performance curve data. (S101), Measuring the current pressure of the water supply pipe and starting the first small capacity pump (S102); Increasing the driving frequency of the first small capacity pump (S103); Comparing the driving frequency and the maximum frequency (60 Hz) of the first small capacity pump (S104), If the driving frequency of the first small capacity pump is equal to or greater than the maximum frequency, driving the third large capacity pump and stopping the first small capacity pump (S105); Comparing the driving frequency and the maximum frequency of the third large capacity pump (S106), If the driving frequency of the third large capacity pump is equal to or greater than the maximum frequency, starting the first small capacity pump (S107); Increasing the driving frequency of the first small capacity pump (S108); Comparing the driving frequency and the maximum frequency of the first small capacity pump (S109), If the driving frequency of the first small capacity pump is equal to or greater than the maximum frequency, driving the fourth large capacity pump in a state in which the third large capacity pump is operated and stopping the first small capacity pump (S110); Comparing the driving frequency and the maximum frequency of the fourth large capacity pump (S111), If the driving frequency of the fourth large capacity pump is equal to or greater than the maximum frequency, starting the first small capacity pump in a state in which the third and fourth large capacity pumps are driven (S112); Increasing the driving frequency of the first small capacity pump (S113); Comparing the driving frequency and the maximum frequency of the first small capacity pump (S114), If the driving frequency of the first small capacity pump is equal to or greater than the maximum frequency, starting the second small capacity pump while the third and fourth large capacity pumps and the first small capacity pump are driven (S115); Increasing the frequency of the second small capacity pump (S116); Comparing the measured pressure and the set pressure of the water supply pipe (S117), If the measured pressure is less than the set pressure, return to the step of increasing the frequency of the second small capacity pump, if the measured pressure is more than the set pressure to reduce the frequency (S118), Comparing the driving frequency and the lower limit frequency of the second small capacity pump (S119), If the driving frequency of the second small capacity pump is greater than or equal to the lower limit frequency, the process returns to step S117 of comparing the measured pressure and the set pressure of the water supply pipe, and if the driving frequency of the second small capacity pump is less than or equal to the lower limit frequency, after the set delay time The control method of the inverter booster pump system comprising the step (S120) of stopping the second small capacity pump. The method of claim 4, wherein In the step S104 of comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), if the driving frequency of the first small capacity pump is not greater than the maximum frequency, comparing the measured pressure and the set pressure of the water supply pipe (S201). )Wow, If the measured pressure of the first small capacity pump is not greater than the set pressure, the flow returns to step S103 of increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the first small capacity pump Reducing the driving frequency of (S202), Comparing the driving frequency and the lower limit frequency of the first small capacity pump (S203), If the driving frequency is not greater than the lower limit frequency, the process returns to step S104 of comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, a setting delay The control method of the inverter booster pump system further comprises the step (S204) of stopping the first small capacity pump after time. The method of claim 4, wherein In step S106 of comparing the driving frequency and the maximum frequency of the third large capacity pump, if the driving frequency of the third large capacity pump is not greater than the maximum frequency, comparing the measured pressure and the set pressure of the water supply pipe (S301), If the measured pressure of the third large capacity pump is not greater than the set pressure, the flow returns to step S105 of driving the third large capacity pump, and if the measured pressure of the third large capacity pump is greater than the set pressure, Reducing the driving frequency (S302), Comparing the driving frequency and the lower limit frequency of the third large capacity pump (S303), If the driving frequency is not greater than the lower limit frequency, the process returns to step S106 of comparing the driving frequency of the third large capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the third large capacity pump is smaller than the lower limit frequency, a setting delay Inverter booster pump system further comprises the step (S304) of stopping the third large capacity pump after time. The method of claim 4, wherein Comparing the driving frequency and the maximum frequency of the first small capacity pump (S109), if the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, comparing the measured pressure and the set pressure of the water supply pipe (S401), If the measured pressure of the first small capacity pump is not greater than the set pressure, the flow returns to step S108 of increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the first small capacity pump Reducing the driving frequency of (S402), Comparing the driving frequency and the lower limit frequency of the first small capacity pump (S403), If the driving frequency is not greater than the lower limit frequency, the process returns to step S109 comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, a setting delay Inverter booster pump system, characterized in that it further comprises the step (S404) of stopping the first small capacity pump after time. The method of claim 4, wherein Comparing the driving frequency and the maximum frequency of the fourth large-capacity pump (S111), if the driving frequency of the fourth large-capacity pump is not greater than the maximum frequency, comparing the measured pressure and the set pressure of the water supply pipe (S501), If the measured pressure of the fourth large-capacity pump is not greater than the set pressure, the operation returns to step S110 of driving the fourth large-capacity pump, and if the measured pressure of the fourth large-capacity pump is greater than the set pressure, driving of the fourth large-capacity pump Reducing the frequency (S502), Comparing the driving frequency and the lower limit frequency of the fourth large capacity pump (S503), If the driving frequency is not greater than the lower limit frequency, the process returns to step S111 of comparing the driving frequency of the fourth large capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the fourth large capacity pump is smaller than the lower limit frequency, the setting delay And stopping the fourth large capacity pump after time (S504). The method of claim 4, wherein In the step S114 of comparing the driving frequency and the maximum frequency of the first small capacity pump, if the driving frequency of the first small capacity pump is greater than or equal to the maximum frequency, comparing the measured pressure and the set pressure of the water supply pipe (S601), If the measured pressure of the first small capacity pump is not greater than the set pressure, the flow returns to step S113 of increasing the frequency of the first small capacity pump, and if the measured pressure of the first small capacity pump is greater than the set pressure, the first small capacity pump Reducing the driving frequency of (S602), Comparing the driving frequency and the lower limit frequency of the first small capacity pump (S603), If the driving frequency is not greater than the lower limit frequency, the process returns to step S114 comparing the driving frequency of the first small capacity pump with the maximum frequency (60 Hz), and if the driving frequency of the first small capacity pump is smaller than the lower limit frequency, a setting delay The control method of the inverter booster pump system further comprises the step (S604) of stopping the first small capacity pump after time.

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