KR20170073061A

KR20170073061A - Method for active controling voltage-frequency pattern of inverter based pump performance data base

Info

Publication number: KR20170073061A
Application number: KR1020150181477A
Authority: KR
Inventors: 지창환; 김대희; 전인; 김종헌; 송경희
Original assignee: 주식회사 대영파워펌프; (주) 인정테크
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2017-06-28
Also published as: KR101772976B1

Abstract

The present invention is characterized in that a water supply amount is measured in real time in an inverter booster pump system and a pump is operated by lowering the voltage so as to maintain a head in a usage period (time) based on a database of a water usage pattern, The present invention relates to a method of controlling an inverter voltage-frequency pattern by a pump performance data base, which can reduce the amount of power used, In an inverter booster pump system in which a plurality of pumps 30 are arranged in parallel and an inverter 40 is mounted to each pump 30 and the operation of the inverter 40 is controlled by the control unit 50, , A database for the water use pattern for 24 hours a day is stored in the control unit 50, and a database for the water use pattern (A, b), the used flow rate is calculated from the HQ pump performance curve data obtained by auto-tuning based on frequency-specific flow rate data, and when the frequency corresponding to the used flow rate is the low flow rate setting frequency Nb ), The voltage is lowered to such a degree that the head can be maintained at the set frequency Nb based on the voltage-frequency graph pattern.

Description

TECHNICAL FIELD [0001] The present invention relates to an inverter voltage-frequency pattern active control method using a pump performance database,

The present invention is characterized in that a water supply amount is measured in real time in an inverter booster pump system and a pump is operated by lowering the voltage so as to maintain a head in a usage period (time) based on a database of a water usage pattern, The present invention relates to a method of controlling an inverter voltage-frequency pattern using a pump performance database capable of reducing the amount of power used and thus reducing the amount of power used.

Korean Patent Application No. 10-2003-0011024 (published on Feb. 6, 2003) discloses a " constant pressure variable inverter control booster pump system ".

Wherein the constant pressure variable inverter control booster pump system comprises a control unit, an inverter controlled by the control unit to change the output frequency according to the pressure of the water supply pipe, a motor controlled to drive the pump by the inverter, And a pump controlled to pump water through the water supply pipe by the motor, wherein the control unit detects a pressure change in the water supply pipe and detects an analog A signal DC of 0 V to 10 V is supplied to the inverter to cause the inverter to change the output frequency for the motor so as to control the speed of the motor under a certain range.

However, the constant pressure variable inverter control booster pump system occupies a large portion of the supply time period in which the water consumption is very small in an apartment, a building or the like 24 hours a day, but there is no attempt to save energy in the supply time period.

Korean Patent No. 10-0895392 (registered on Apr. 21, 2009), "Booster Pump Ownership Determination Control Applied with Inverter" is introduced.

The Booster Pump Ownership Determination Control to which the inverter is applied returns to the start if the inverter does not have a single Pump controlled by the Oil Sense Control but has previously performed the Ownership Discrimination Control Changing the set pressure back to the start and returning to the start;

Initializing a timer count for entering the first stage and returning to the start if there is only one pump controlled by the inverter, not the second stage of the ownership discrimination control, the second stage of the ownership amount discrimination control, and neither the discharge pressure nor the set pressure;

If the discharge pressure and the set pressure are equal, a count is executed for detection. If the detection time count is less than the detection time, the process returns to the beginning. If the count is longer than the detection time, Returning; In case of only one pump controlled by the inverter, it is not the second stage of the ownership discrimination control, and if it is the first stage of the ownership discrimination control, the rotation speed of the pump is decreased by changing the set pressure to the set pressure- Set pressure deviation detection value ", the step of removing the first step flag, initializing the discrimination time count, changing the set pressure to the original value, and returning to the start;

If the discharge pressure is within the set pressure detection deviation, the discrimination time count is executed. If the count does not exceed the discrimination time, the flow returns to the start. If the discharge pressure is equal to or longer than the discrimination time, Returning to the start;

If only one pump is controlled by the inverter, the set pressure is changed to the final stop pressure to increase the number of rotations of the pump. If the discharge pressure is less than the final stop pressure, And if it is equal to or higher than the stop pressure, initializing the second stage flag and stopping the pump is applied.

However, the booster pump possessing discrimination control to which the inverter is applied does not describe a method of lowering the used electric power by lowering the voltage when the booster pump is driven in a usage period in which the booster pump is driven.

Accordingly, an object of the present invention is to measure the water supply amount in real time and to operate the pump in such a manner that the voltage is lowered to such an extent that the head can be maintained in the usage period (time) And to provide an active control method of an inverter voltage-frequency pattern by a pump performance database that can reduce current and thus reduce power consumption.

According to another aspect of the present invention, there is provided a method for controlling an inverter voltage-frequency pattern by a pump performance database, comprising the steps of: arranging a plurality of booster pumps in parallel between a suction pipe and a water supply pipe; And the operation of the inverter is controlled by the control unit, wherein the water supply amount is measured in real time, the database for the water use pattern for 24 hours a day is stored in the control unit, If the frequency corresponding to the used flow rate corresponds to the low flow rate setting frequency, the HQ pump performance curve data obtained by the auto tuning calculates the used flow rate on the basis of the frequency- Based on the voltage-frequency graph pattern, keep the head at the set frequency And the voltage is reduced to such an extent that the voltage is reduced.

The water usage pattern data is obtained by database processing the data acquired in one month, and the data base is constructed by statistically processing the 24 hours by the hour to know the use amount usage period based on the water usage pattern data for each month .

The method of controlling the inverter voltage-frequency pattern by the pump performance database according to the present invention

Determining whether the period of use of the product is within a period of 24 hours a day,

Determining whether the pump being driven is a single pump,

If the number of driven pumps is one, receiving the inverter frequency of the drive pump and judging whether the input frequency is larger than the set frequency,

Sequentially lowering the voltage in a predetermined unit if the input frequency is not greater than the set frequency,

Checking whether there is a current rebound;

And increasing the voltage to the previous step and checking the frequency change if there is a current rebound.

Accordingly, the inverter voltage-frequency pattern active control method using the pump performance data base according to the present invention operates the pump by lowering the voltage to such an extent that it can maintain the head during the use period (time) of use, So that it is possible to reduce the amount of power used.

1 is a schematic view showing an inverter booster pump system according to the present invention;
2 is a graph showing a water usage pattern of an apartment where the inverter booster pump system according to the present invention is installed;
3 is a graph showing the HQ performance curve of the inverter booster pump system according to the present invention
FIG. 4 is a graph showing a voltage-frequency graph corresponding to FIG. 3
FIG. 5 is a flowchart showing a method of active control of an inverter voltage-frequency pattern by a pump performance database according to the present invention.

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

1, an inverter booster pump system generally includes a plurality of booster pumps 30 arranged in parallel between a suction pipe 10 and a water supply pipe 20, and each pump 30 is connected to an inverter 40 And the operation of the inverter 40 is controlled by the control unit 50. [

2 to 4, in the inverter booster pump system according to the present invention, the inverter voltage-frequency pattern active control method using the pump performance data base according to the present invention measures the water supply amount in real time, (A and b) (see FIG. 2) based on the database of the water usage pattern, the HQ pump performance curve obtained through the auto tuning Frequency flow pattern (refer to FIG. 3), and if the frequency corresponding to the flow rate used corresponds to the low flow rate setting frequency Nb, it is determined based on the voltage-frequency graph pattern (see FIG. 4) And the voltage is reduced to such a degree that the head can be maintained at the set frequency Nb. As a result, the use current corresponding to the voltage can be reduced, and consequently, the amount of power used can be reduced.

For example, FIG. 2 is a database obtained by performing an operation after an inverter booster pump system is installed in an apartment. That is, after installing an inverter booster pump system in one apartment, the operation can be performed to obtain water usage pattern data of the apartment for 24 hours. At this time, the water use pattern data is obtained by database processing the data acquired for one month, constructing a database by statistically processing the 24 hours by time, and by using the water usage pattern data for each month, (a, b).

In the graph of FIG. 2, the section between 10 o'clock and 18 o'clock and between 1 o'clock and 5 o'clock is the proprietary usage section, the graph line is the measured flow rate measured, and the (b) (A) and (b) based on the graph line (b). As shown in the graph of FIG. 2, the proprietary usage periods a and b occupy half of the 24 hours, and problems occur even when the voltage is lowered until the current rebound occurs in the proprietary usage periods a and b , The power saving can be expected in the use period (a, b).

3 shows the HQ pump performance curve data actually obtained through the auto-tuning after the inverter booster pump system is installed, and the frequency is converted into the set pressure H ₀ according to the increase or decrease of the flow rate. That is, when the used flow rate changes from Q _A ? Q _B ? 0, the frequency of the inverter is changed from Na to Nb to Nc. At this time, only one pump is driven in the usage period (a, b), and when the commercial frequency of the inverter is decreased at Na and reaches the set frequency Nb corresponding to the control of the ownership, (Nb). &Lt; / RTI >

As shown in Fig. 4, the voltage V and the frequency f are in direct proportion, and the voltage V is also increased or decreased in direct proportion to the increase or decrease in the frequency f. At this time, as shown in FIG. 4, the voltage is lowered until the change of the head is maintained while the proprietary set frequency Nb is maintained as it is. That is, for example, by lowering the voltage to a volt in a state where the voltage of b volts corresponds to the frequency Nb, the current can be lowered corresponding to the a volt voltage, .

The method of controlling the inverter voltage-frequency pattern by the pump performance database according to the present invention will now be described with reference to FIG.

(A, b) during a 24-hour day (S101). Here, if it is not the proprietary usage period (a, b), the program ends.

If it is the propane consumption period (a, b), it is determined whether the driven pump is one (S102). Here, if there are two or more pumps being driven, the process returns to step S101.

If the number of driven pumps is one, the inverter frequency of the drive pump is input, and it is determined whether the input frequency is larger than the set frequency Nb (S103). If the input frequency is larger than the set frequency Nb, the process returns to step S102.

If the input frequency is not greater than the set frequency Nb, the voltage is sequentially lowered in a predetermined unit (S104).

At this time, although the current is proportionally lowered according to the voltage drop, since the head must be kept constant at all times, if the instantaneous current rises in the process of lowering the voltage, the controller 50 checks whether there is a current rebound (S105). If there is no current rebound, feedback is made to S104.

If there is a current rebound, the voltage is increased to the previous step and a frequency change is checked (S106).

10: Suction piping 20: Water supply piping
30: Booster pump 40: Inverter
50:

Claims

A plurality of booster pumps 30 are arranged in parallel between the suction pipe 10 and the water supply pipe 20 and an inverter 40 is mounted to each pump 30. The control unit 50 controls the inverter 40) is controlled, comprising:
The water supply amount is measured in real time, and the database for the water use pattern for 24 hours a day is stored in the control unit 50. If the water usage pattern is a usage amount usage period (a, b) based on the database for the water usage pattern, , And if the frequency corresponding to the flow rate used corresponds to the low flow rate setting frequency (Nb), the flow rate is calculated based on the voltage-frequency graph pattern. And the voltage is lowered to such a degree that the head can be maintained at the set frequency (Nb), thereby operating the inverter voltage-frequency pattern active control method using the pump performance database.

The method according to claim 1,
The water use pattern data is obtained by processing the data acquired during one month into a database and by constructing a database by statistically processing the water for 24 hours by time, , b) of the pump voltage database are known.

A step (S101) of judging whether or not the usage amount is a usage period (a, b) of 24 hours a day,
A step (S102) of judging whether the pump being driven is a single pump if it is the propulsion oil usage section (a, b)
(S103) of receiving the inverter frequency of the drive pump and determining whether the input frequency is greater than the set frequency (Nb) if one pump is being driven;
If the input frequency is not greater than the set frequency Nb, step S104 of sequentially lowering the voltage by a predetermined unit,
Step S105 of checking whether there is a current rebound,
And a step (S106) of increasing a voltage to a previous step and checking a frequency change if there is a current rebound.