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Method and device for frequency converter to eliminate harmonics

A technology for eliminating harmonics and frequency converters, applied in output power conversion devices, electrical components, etc., can solve the problems of high cost, complex structure, complex technology, etc., and achieve the effect of obvious effect, low cost and simplified structure.

Inactive Publication Date: 2017-03-22
碳捕集(北京)科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of harmonic control is technically complicated. Usually, a harmonic source for offsetting harmonics must be specially set up, and a special analysis system must be set up to analyze various parameters of harmonics in order to manufacture harmonics that can be offset.
Due to the complex technology, complex structure and high cost, it is difficult to be widely accepted.

Method used

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  • Method and device for frequency converter to eliminate harmonics
  • Method and device for frequency converter to eliminate harmonics
  • Method and device for frequency converter to eliminate harmonics

Examples

Experimental program
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Effect test

Embodiment 1

[0021] This embodiment is a method for frequency converter to eliminate harmonics. For the process, see figure 1 shown.

[0022] This embodiment adopts a unique technology on the harmonic control of the output motor current of the frequency converter. By sampling the three-phase current of the motor in real time, and performing Fourier analysis on the sampled current, decomposing it into the fundamental wave and each harmonic, and compensating the positive and negative sequence harmonics from the output waveform of the frequency converter respectively, thus To achieve the purpose of weakening the harmonic effect and reducing the energy consumption of the motor. Normally, the frequency converter will send out a fitting sine wave to drive the motor to rotate. In the case of using the power frequency 50Hz as the positive reference, the 5th harmonic (3n-1) is defined as the negative sequence harmonic, that is, its The rotation direction of the magnetic field generated in the mot...

Embodiment 2

[0031] This embodiment is an improvement of the first embodiment, and it is a refinement of the first embodiment about "analysis steps". The "step of analysis" described in this embodiment also includes: storing the analysis result and using it in the "step of formulating a harmonic elimination scheme".

[0032] The purpose of this embodiment is to establish a database storing a large amount of data, and analyze these data at a higher level, such as the harmonic law of each frequency converter, various causes of occurrence, and characteristics of occurrence, etc. Utilize these data, can control the harmonic produced by the frequency converter more effectively. A small storage device can be set in each frequency converter, and its data can be downloaded regularly and stored in a large database for backup.

Embodiment 3

[0034] This embodiment is a device for eliminating harmonics of a frequency converter using the method described in the above embodiments, the structure is as follows figure 1 shown. This embodiment includes: connecting a reactor to the input end or output end of the frequency converter, the output end of the frequency converter is connected to a sampling unit, the sampling unit is connected to an analysis unit, and the analysis unit is connected to a dynamic control unit , the dynamic control unit is connected with the delay output unit and the inverter unit of the frequency converter, the inverter unit of the frequency converter is connected with the delay output unit, and the delay output unit is connected with the frequency converter output connection.

[0035]This embodiment is divided into two parts, one is a passive harmonic elimination part, and the other is an active harmonic elimination part. The passive part is the reactor. The active part is a digital processing...

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Abstract

The invention relates to a frequency converter harmonic wave elimination method and a frequency converter harmonic wave elimination device. The frequency converter harmonic wave elimination device is characterized in that a reactor is connected to the input end or the output end of a frequency converter, the output end of the frequency converter is connected with a sampling unit, the analysis unit is connected with the sampling unit and a dynamic control unit, the dynamic control unit is connected with a delay output unit and an inverter unit of the frequency converter, and the delay output unit is connected with the inverter unit of the frequency converter and the output end of the frequency converter. The frequency converter harmonic wave elimination method and the frequency converter harmonic wave elimination device have the advantages that harmonic waves generated inside the frequency converter are detected in real time and output effect delay is controlled dynamically after part of harmonic waves are generated while the reactor is added in the frequency converter; as the device is different from an existing active filter, the intrinsic inverter unit of the frequency converter is used for generating the harmonic waves for counteracting harmful harmonic waves according to the method, so that the active filter is simplified structurally greatly; total elimination quantity of the harmonic waves is above 70%, and the device is much lower in cost than the existing active filter and is remarkable in harmful harmonic wave elimination effect.

Description

technical field [0001] The invention relates to a method and a device for eliminating harmonics of a frequency converter, and is a method for controlling harmonics generated by a frequency converter and a device designed according to the method. Background technique [0002] The frequency converter of the motor will generate a large number of harmonics during the working process. These harmonics will reduce the working efficiency of the frequency converter, and at the same time interfere with the surrounding electronic equipment, making it unable to work normally. For example, in the process of adjusting the frequency converter, various electronic instruments need to be used, but the harmonic interference generated by the frequency converter, without any protection, often makes it difficult for these electronic devices to work normally, which in turn makes the adjustment of the frequency converter difficult. It also becomes difficult. However, some harmonics with large ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/12H02M1/126
Inventor 毛文剑
Owner 碳捕集(北京)科技股份有限公司
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