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A method and device for resisting bus voltage fluctuation

A bus voltage and reference voltage technology, which is applied in the control of electromechanical transmission devices, electromechanical brakes, generators, etc., can solve the problems of increased shutdown rate, easy shutdown faults, large bus voltage fluctuations, etc., to improve stability and efficiency, eliminating instability, and reducing the number of occurrences

Active Publication Date: 2018-06-26
SHENZHEN ZHENBANG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a method for resisting bus voltage fluctuations, which aims to solve the problem that the bus voltage fluctuations in existing motors are large, and the frequency converter cannot resist bus voltage fluctuations during deep modulation and cannot output to the motor coil terminals The standard sine wave voltage affects the smoothness and efficiency of the motor operation, and it is prone to shutdown failures, which increase the shutdown rate.

Method used

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  • A method and device for resisting bus voltage fluctuation
  • A method and device for resisting bus voltage fluctuation
  • A method and device for resisting bus voltage fluctuation

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Embodiment 1

[0025] figure 1 It is an implementation flowchart of a method for resisting bus voltage fluctuations provided by an embodiment of the present invention, and is described in detail as follows:

[0026] In step S101, obtain the rectified bus voltage output by the AC mains;

[0027] In step S102, a pre-configured transfer function is used to quickly transmit the valley of the bus voltage and slowly transmit the peak of the bus voltage to generate a virtual bus voltage;

[0028] Wherein, the transfer function includes a crest transfer function and a trough transfer function.

[0029] Wherein, a preconfigured trough transfer function is used to quickly transfer the trough of the bus voltage, and a preconfigured peak transfer function is used to slowly transfer the peak of the bus voltage to generate a virtual bus voltage.

[0030] In step S103, the output range of the reference voltage is limited according to the virtual bus voltage.

[0031] A vector control algorithm is adopte...

Embodiment 2

[0037] The embodiment of the present invention describes the implementation process of configuring the transfer function, which is described in detail as follows:

[0038] Configure the transfer function with a preconfigured first-order low-pass filter.

[0039] refer to image 3 , image 3 is a functional block diagram of the configuration transfer function provided by the embodiment of the present invention.

[0040] Among them, in image 3 Among them, the bus voltage VDC is periodically collected, and a voltage error amount ERROR is generated by subtracting VDC_FLT from VDC, and the error amount is multiplied by a coefficient K1 or K2, and then accumulated to generate a new output VDC_FLT,

[0041] refer to Figure 4 , Figure 4 is the first transmission block diagram provided by the embodiment of the present invention.

[0042] When VDC is greater than or equal to VDC_FLT, S1 is closed and S2 is separated, and the formed transfer function is:

[0043]

[0044] A ...

Embodiment 3

[0052] Image 6 It is the implementation flowchart of step S102 of the method for resisting bus voltage fluctuations provided by the embodiment of the present invention, and is described in detail as follows:

[0053]In step S601, a pre-configured transfer function is used to quickly transfer the valley of the bus voltage and slowly transfer the peak of the bus voltage to generate a virtual bus voltage to be transferred;

[0054] In step S602, a preconfigured virtual bus voltage generation model is used to generate a virtual bus voltage according to a preconfigured transfer function, the bus voltage, and the transferred virtual bus voltage, and the virtual bus voltage generation model includes peak transfer model and the trough transfer model.

[0055] In the embodiment of the present invention, the wave peak transfer model and the wave trough transfer model can well resist bus voltage fluctuations and eliminate instability caused by bus voltage fluctuations.

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Abstract

The invention is applicable to the field of motors, and provides a method and an apparatus for resisting busbar voltage fluctuation. The method for resisting the busbar voltage fluctuation comprises the steps of obtaining a busbar voltage output by an alternating current mains supply after being rectified; rapidly transferring the wave trough of the busbar voltage by adopting a pre-configured transfer function, slowly transferring the wave crest of the busbar voltage to generate a virtual busbar voltage; and limiting the output range of reference voltage according to the virtual busbar voltage. The method and apparatus enable the frequency converter in the motor to resist the busbar voltage fluctuation, and the standard sine-wave voltage still can be output under the busbar voltage fluctuation and a large modulation depth, so that the unstable phenomenon caused by the busbar voltage fluctuation is eliminated completely; and therefore, the stability and the efficiency of the motor can be improved, the times of the machine halt faults are greatly reduced as well, and the outage factor is reduced.

Description

technical field [0001] The invention belongs to the field of motors, in particular to a method and device for resisting bus voltage fluctuations. Background technique [0002] The motor is referred to as a motor, or a generator. The control of the motor (PMSM) adopts the classical vector control algorithm, and one of the important steps is the space vector modulation. If VDC is used to represent the DC bus voltage, then in the linear region, the maximum output of the space vector modulator can only reach 0.866*VDC, that is When the frequency converter is deeply modulated, it outputs a sine wave voltage to the motor coil terminal according to the bus voltage. [0003] However, the bus voltage fluctuations in existing motors are large, and the frequency converter cannot resist the bus voltage fluctuations during deep modulation, and cannot output standard sine wave voltage to the motor coil terminals, which affects the smoothness and efficiency of the motor operation, and i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P27/04
CPCY02P80/10
Inventor 邓伟陈志杰
Owner SHENZHEN ZHENBANG TECH