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Motor frequency conversion frequency tracking and switching method

A technology of frequency tracking and frequency, applied in motor control, AC motor control, electrical components, etc., can solve problems such as phase difference, potential safety hazards, limitation of real-time switching and motor power section, etc., to achieve fast switching and safe switching Effect

Active Publication Date: 2015-04-08
上海海泰克系统工程有限公司
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Problems solved by technology

However, due to the phase difference problem of frequency conversion and power frequency switching, the real-time performance of the switching and the power range of the motor are limited.
Therefore, in practical applications, due to the phase difference between the frequency conversion output of the pump set and the power frequency of the city network, the motor cannot be quickly switched between the frequency conversion and power frequency, and there are safety hazards when switching

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Embodiment Construction

[0026] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.

[0027] Based on the phase randomness of the frequency signal output by the frequency conversion, even the same frequency will have an impact on the power grid when switching. This solution adjusts the frequency of the variable frequency output by tracking the zero phase of the power frequency voltage waveform, so that the waveform of the power frequency voltage is completely synchronized with the waveform of the variable frequency voltage (that is, the same frequency), and the power supply is switching at this time.

[0028] Specifically, since the two output frequencies and phases of the power frequency voltage and the variable frequency voltage are completely different, there will be two zero-phase intersection moments of the least common multi...

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Abstract

The invention discloses a motor frequency conversion frequency tracking and switching method. Through tracking zero phases of power frequency voltage waveforms, the method adjusts the output frequency of variable frequency, so that two voltage waveforms completely synchronize. The method can effectively solve a problem of phase difference between pumping set frequency conversion output and city network power frequency, realizing real-time, rapid, and safe switching of power frequency of motor frequency conversion.

Description

technical field [0001] The invention relates to a motor frequency conversion technology, in particular to the motor frequency conversion frequency tracking and switching technology. Background technique [0002] The control of water pumps and pumps is widely used in all walks of life, especially in construction, industry, municipal, irrigation and other fields. Taking the typical constant pressure water supply as an example, there are many control modes, among which the scheme of single frequency conversion and multiple power frequency is the most economical. However, due to the phase difference problem in frequency conversion and power frequency switching, the real-time performance and motor power range of the switching are limited. Therefore, in practical applications, due to the phase difference between the frequency conversion output of the pump set and the power frequency of the city network, the motor cannot be quickly switched between the frequency conversion and pow...

Claims

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Application Information

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IPC IPC(8): H02P27/00
CPCH02P27/00H02P2209/00
Inventor 苏寿喜
Owner 上海海泰克系统工程有限公司
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