An Adaptive Control Method of Inverter Undervoltage Protection Value

An adaptive control and undervoltage protection technology, applied in the field of control, can solve problems such as the inability to effectively improve the voltage sag tolerance of the inverter, and achieve the effect of reducing the undervoltage protection setting value and improving the voltage sag tolerance

Active Publication Date: 2022-04-26
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an adaptive control method for the undervoltage protection value of the frequency converter, so as to alleviate the problem in the prior art that the voltage sag tolerance of the frequency converter cannot be effectively improved without changing the hardware structure of the frequency converter technical issues

Method used

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  • An Adaptive Control Method of Inverter Undervoltage Protection Value
  • An Adaptive Control Method of Inverter Undervoltage Protection Value
  • An Adaptive Control Method of Inverter Undervoltage Protection Value

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Embodiment 1

[0039] According to an embodiment of the present invention, an embodiment of an adaptive control method for inverter undervoltage protection value is provided. It should be noted that the steps shown in the flow chart of the accompanying drawings can be implemented in a set of computer-executable instructions such as computer system, and although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

[0040] image 3 A flow chart of an adaptive control method for an inverter undervoltage protection value provided by an embodiment of the present invention, as shown in image 3 As shown, the method includes the following steps S101 to S103, wherein:

[0041] Step S101, setting an initial undervoltage protection setting value for the frequency converter. Wherein, the initial electromagnetic torque corresponding to the initial undervoltage protection setting value is grea...

Embodiment 2

[0102]The embodiment of the present invention provides an adaptive control device for the undervoltage protection value of the frequency converter. The adaptive control device for the undervoltage protection value of the frequency converter is mainly used to implement the undervoltage protection value of the frequency converter provided by the above content in Embodiment 1 The adaptive control method for the inverter undervoltage protection value provided by the embodiment of the present invention will be specifically introduced below.

[0103] Figure 7 It is a schematic structural diagram of an adaptive control device for an inverter undervoltage protection value provided by an embodiment of the present invention. like Figure 7 As shown, the adaptive control device for the undervoltage protection value of the frequency converter mainly includes: a setting unit 11, a reducing unit 12 and an increasing unit 13, wherein:

[0104] The setting unit 11 is used to set an initial...

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Abstract

The invention provides an adaptive control method for the undervoltage protection value of a frequency converter, which relates to the technical field of control, including: first setting an initial undervoltage protection setting value for the frequency converter; and then reducing the initial undervoltage protection setting value The target intermediate value is obtained by the method; finally, the final undervoltage protection setting value is obtained by increasing the target intermediate value according to the preset step size; where, the final undervoltage protection setting value corresponds to the final electromagnetic torque greater than or equal to the motor load torque. In the present invention, by reducing the initial undervoltage protection setting value to obtain the target intermediate value, and increasing the target intermediate value once to obtain the final undervoltage protection setting value, self-adaptive regulation can be realized, and in the case of ensuring the normal operation of the motor The setting value of undervoltage protection can be reduced to the maximum extent, and then the voltage sag tolerance of the inverter can be effectively improved without changing the hardware structure of the inverter.

Description

technical field [0001] The invention relates to the technical field of control, in particular to an adaptive control method for an undervoltage protection value of a frequency converter. Background technique [0002] Variable-frequency Drive (VFD) is one of the devices that are very sensitive to voltage sags. In the process of industrial production, because it is easily affected by voltage sag, it often leads to unqualified product quality or interruption of the production process. In severe cases, it will also damage the production equipment and cause serious losses to industrial production. Therefore, it is of great significance to study the method of improving the voltage sag tolerance of the frequency converter to reduce the tripping event of the frequency converter under the condition of voltage sag and prevent the loss of production equipment. [0003] In order to avoid the failure of the frequency converter caused by voltage sag, most of the methods currently used to...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H02M1/32H02P27/08
CPCH02M1/32H02P27/08
Inventor莫文雄王勇栾乐许中彭和平朱璐王海靖范伟男刘俊翔肖天为罗思敏徐硕
OwnerGUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD