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Overload automatic protection control method for water pump frequency converter

A technology of automatic protection and control method, applied in pump control, machine/engine, pump, etc., can solve problems such as pump damage, and achieve the effect of ensuring safe and efficient operation

Active Publication Date: 2019-10-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problem that the water pump system under constant pressure control may encounter damage to the pump due to overload in the above situation, the present invention proposes an overload automatic protection control method for the water pump frequency converter to protect the safe operation of the pump

Method used

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  • Overload automatic protection control method for water pump frequency converter
  • Overload automatic protection control method for water pump frequency converter
  • Overload automatic protection control method for water pump frequency converter

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Embodiment Construction

[0032] In order to better state the present invention, the water pressure regulation of a certain residential building is taken as an example to introduce:

[0033] After the water pump is started, the control unit detects that the water pressure at the pump outlet is 500Mpa, which is less than the set value of water pressure 1000Mpa, and the control unit operates the constant pressure control module. The initial condition is that the water pump outlet pressure is 1000Mpa, through the formula and K p1 ,K i1 ,K d1 The preset value calculates the required power as 100Hz, where L F The amplitude of the pump is 31.6; the frequency parameter 100Hz is transmitted to the pump, and the pump increases the speed, thereby increasing the output pressure of the pump. At the same time, the control unit monitors in real time whether the operating power of the pump exceeds the rated power of the pump 1000kw.

[0034] After the pump is adjusted by the control unit, the output water pressur...

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Abstract

The invention discloses an overload automatic protection control method of a water pump frequency converter, and belongs to the technical field of water pump control. The water pump system comprises an alternating current power supply, a pressure sensor, a pump and a special frequency converter. The special frequency converter comprises an alternating current frequency conversion circuit and a control unit. The control unit comprises a power calculation module, a signal acquisition module, a constant pressure control module and a constant power control module and is responsible for setting a frequency set value f of output current. The overload protection control method of the invention is mainly applied to a control module of a special frequency converter control unit. The constant pressure control module in the control module is responsible for power judgment and constant pressure frequency modulation; and the constant power control module is responsible for pressure judgment and constant power frequency modulation. The overload protection control method of the invention ensures the constant pressure control in a rated power range and realizes the constant power control in an overload state by timely switching the constant pressure and the constant power frequency modulation, thereby finishing the effective protection of the pump.

Description

technical field [0001] The invention belongs to the technical field of water pump control, and in particular relates to an overload automatic protection control method for a water pump frequency converter. Background technique [0002] The current water supply system usually adopts constant pressure water supply to ensure sufficient water pressure on each floor. The constant pressure control method realized by adjusting the frequency through frequency conversion technology is the mainstream trend in the urban water supply system. The so-called constant pressure control refers to the constant pressure adjustment of the water outlet pressure of the water pump. According to the pressure signal collected at the water outlet, the output frequency of the frequency converter is adjusted, and then the pump speed is controlled. Equipment that realizes constant pressure water supply through frequency conversion technology will set a water outlet pressure value to ensure constant pres...

Claims

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Application Information

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IPC IPC(8): F04D13/06F04D15/00
CPCF04D13/06F04D15/00F04D15/0066
Inventor 边春元刘昊侗杜远鹏满永奎宋敬元
Owner NORTHEASTERN UNIV
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