Method for detecting default phase of frequency converter

A detection method and frequency converter technology, which can be applied in the direction of asymmetric measurement of polyphase networks, motor generator testing, etc., and can solve problems such as misjudgment prone to occur.

Inactive Publication Date: 2012-11-28
CHINA XD ELECTRIC CO LTD
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Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a detection method for the lack of phase of the frequency converter, to solve the problem that the above-mentioned judgment of the lack of phase is prone to misjudgment

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  • Method for detecting default phase of frequency converter
  • Method for detecting default phase of frequency converter
  • Method for detecting default phase of frequency converter

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Embodiment Construction

[0032] In order to clearly illustrate the solutions in the present invention, preferred embodiments are given below and detailed descriptions are given in conjunction with the accompanying drawings.

[0033] see figure 2 As shown in the flow chart, a detection method for a frequency converter phase loss of the present invention includes the following steps:

[0034] S11: Sampling the current signal of one phase in the three-phase power of the frequency converter;

[0035] S12: According to the sampling sequence, divide the collected sampling values ​​into three groups; wherein, each group includes at least 3 sampling values;

[0036] For example: set the number of sampling points according to the sampling frequency and waveform period; after setting, there are 100 sampling points in one waveform period, if each group includes 3 sampling values ​​in sequence, 33 groups can be obtained; if each group Including 4 sample values ​​for sequential sampling, 25 groups can be obtain...

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Abstract

The invention discloses a method for detecting a default phase of a frequency converter. The method comprises the steps of: sampling an electric signal of one of the three phases of the frequency converter; dividing multiple acquired sampling values into three groups according to the sampling sequence, wherein each group at least comprises three sampling values; operating an absolute value of the mean value of the sampling values in each group; and if the absolute value of the second group is judged to be greater than or less than the absolute values of the other two groups and less than a threshold, determining that the phase is a default phase. By obtaining the absolute values of the mean values of the sampling values sampled for three times, the method for detecting the default phase of the frequency converter, disclosed by the invention, has the advantages of well suppressing the conditions of big actual waveform harmonics and a plenty of burrs, improving accuracy of default phase judgment and being good in practical applicability.

Description

technical field [0001] The invention relates to the field of motor fault detection, in particular to a detection method for inverter phase loss. Background technique [0002] In the field of motor control, frequency converters are usually used to control the rotational performance of the motor. No matter when the motor is starting or running, the output phase loss of the inverter will cause the motor to fail to rotate, or the power performance will decrease, and more seriously, it will cause a short circuit of the motor, and the motor will be burned due to excessive current and excessive heat generation. Therefore, when the motor is started and running, it is necessary to detect whether the output power of the frequency converter is out of phase, so as to take corresponding motor protection measures. [0003] At present, whether there is a phase loss is judged through the output side of the inverter, mainly to judge whether the collected current signal is in a regular fluct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/16G01R31/34
Inventor 张少伟黄小光苏位峰卫三民苟锐锋李侠
Owner CHINA XD ELECTRIC CO LTD
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