Constant pressure water supply control method and system

Abstract

The embodiment of the invention provides a constant pressure water supply control method and system. The constant pressure water supply control method is applied to a frequency converter to control amain pump motor and N auxiliary pump motors, and comprises the steps: parameters are initialized; if it is judged that a water supply demand value is increased, the working frequency of the main pumpmotor and the N auxiliary pump motors are adjusted according to a first preset adjustment mode, so that a pipe network pressure value reaches a target pressure value; and if the water supply demand value is decreased, the working frequency of the main pump motor and the N auxiliary pump motors are adjusted according to a second preset adjustment mode, so that the pipe network pressure value reaches the target pressure value. By adopting the constant pressure water supply control method, the pipe network pressure value can be maintained at a constant value under different water supply demands by automatically adjusting the operating frequency of the main pump motor and controlling the auxiliary pump motors.

Description

technical field [0001] The invention belongs to the technical field of frequency converters, and in particular relates to a constant pressure water supply control method and system. Background technique [0002] In order to save energy, in water pump water supply applications, frequency converters are generally used to drive the water pumps for constant pressure water supply. When the pipe network pressure is not enough, it is necessary to drive the auxiliary water pump motor to assist the main pump motor to adjust the constant pressure water supply. In the existing technology, when the power frequency auxiliary pump motor is switched on and off and the pipe network pressure is zero, there is a working condition of system air leakage, and the frequency conversion main pump motor cannot accurately and automatically adjust the frequency, and the purpose of constant pressure water supply cannot be achieved. Contents of the invention [0003] In view of this, the present inve...

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Problems solved by technology

In the existing technology, when the power frequency auxiliary pump motor is switched on and off and the pipe network pressure is zero, there is a working condition of system air leakage, and the frequency conversion main pump motor cannot accurately and automatically adjust the frequency, and the purpose of constant pressure water supply cannot be achieved.

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