Method for detecting input outage of frequency converter

A detection method and frequency converter technology, which is applied in the direction of instruments, measuring electronics, measuring devices, etc., can solve the problems of slow bus voltage, inability to quickly detect frequency converters, discounts, etc.

Active Publication Date: 2014-09-03
SHANGHAI STEP ELECTRIC +1
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Problems solved by technology

Although this method can judge correctly in most cases, it cannot quickly detect whether the input of the inverter is powered off, especially to realize the power-off endurance function (the power-off endurance function refers to the power failure during the operation of the inverter. , when the input power failure occurs, take certain measures to make the bus voltage drop more slowly, so that the inverter can maintain the power state for a longer time), if the input power failure cannot be detected in time, this function will be greatly reduced

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  • Method for detecting input outage of frequency converter

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Embodiment Construction

[0018] In order to make the object, technical solution and advantages of the present invention clearer, various embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that, in each implementation manner of the present invention, many technical details are provided for readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solution claimed in each claim of the present application can be realized.

[0019] The first embodiment of the present invention relates to a detection method for inverter input power failure, the specific process is as follows figure 1 shown, including the following steps:

[0020] Step 101, in each preset period (T), monitor the output current and the bus voltage of the frequency converter in rea...

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Abstract

The invention relates to the control technology of electric motors and discloses a method for detecting an input outage of a frequency converter. The method for detecting the input outage of the frequency converter comprises the steps that the input current of the frequency converter is monitored in real time in each preset period T, and the output current and the busbar voltage of the frequency converter are monitored in real time; output energy Wout is calculated according to the output current; the energy storage change delta Wc of a busbar capacitor is calculated according to the busbar voltage; the frequency of breakdowns of the frequency converter is recorded according to the energy storage change delta Wc and the output energy Wout; it is judged that the input outage of the frequency converter occurs if it is detected that the frequency of the breakdowns of the frequency converter is larger than a preset frequency. Compared with the prior art, the method for detecting the input outage of the frequency converter has the advantages that the input outage of the frequency converter can be detected rapidly and timely, and hardware cost is reduced.

Description

technical field [0001] The invention relates to motor control technology, in particular to a detection method for frequency converter input power failure. Background technique [0002] At present, under normal circumstances, the method used to judge whether the input of the inverter is powered off is that if the bus voltage drops to a certain level (such as lower than 1 / 4 of the rated voltage), the input of the inverter is considered to be powered off. Although this method can judge correctly in most cases, it cannot quickly detect whether the input of the inverter is powered off, especially to realize the power-off endurance function (the power-off endurance function refers to the power failure during the operation of the inverter. , when the input power failure occurs, take certain measures to make the bus voltage drop more slowly, so that the inverter can maintain the power state for a longer time), if the input power failure cannot be detected in time, this function will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
Inventor 李兴鹤金辛海宋吉波柳竹青
Owner SHANGHAI STEP ELECTRIC
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