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Active power filtering system based on seven-level converter and compensation method thereof

A technology of power filtering and compensation method, which is applied in active power filtering, AC network to reduce harmonics/ripples, AC power input conversion to DC power output, etc., and can solve the problem of bulky filter devices and level expansion capabilities Limited, high harmonic content, etc., to achieve the effect of small voltage stress, small switching loss, and large system capacity

Inactive Publication Date: 2019-10-18
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, the existing multi-level active power filter has a complex structure and a large number of switching tubes, which makes the filter device bulky, with limited level expansion capability and high harmonic content.

Method used

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  • Active power filtering system based on seven-level converter and compensation method thereof
  • Active power filtering system based on seven-level converter and compensation method thereof
  • Active power filtering system based on seven-level converter and compensation method thereof

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Embodiment Construction

[0056] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0057] It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number, shape and number of componen...

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Abstract

The invention discloses an active power filtering system based on a seven-level converter and a compensation method thereof, belongs to the field of power quality control, and solves the problems thatin the prior art, the filter structure is huge and the harmonic content is high because a multi-level active power filtering system uses too many switching tubes. The seven-level current converter comprises an A-phase current converter, a B-phase current converter and a C-phase current converter which have the same structure, wherein the A-phase current converter comprises three direct-current capacitors, a first bridge arm formed by four power switch tubes and a second bridge arm formed by the other four power switch tubes. The system has the advantages of small switching loss, small voltagestress, low electromagnetic interference, large system capacity and the like, and outputs multi-level voltage waveform with small harmonic content, thereby reducing the volume of the filter device.

Description

technical field [0001] The invention relates to the field of power quality control, in particular to an active power filter system based on a seven-level converter and a compensation method thereof. Background technique [0002] With the rapid improvement of our country's science and technology level, there are harmonic loads everywhere in our daily life. The harmonics in the power grid are all generated by nonlinear devices (diodes, power switch tubes, transformers) inside the power electronic equipment. The existence of harmonics will increase the additional loss of electrical equipment. The wave current will produce sharp noise, and it will also cause the silicon steel sheet or ferrite of the reactor to saturate in advance and cause severe heating; the transmission line contains a large number of harmonic currents, which will reduce the transmission efficiency of the power system and cause the line to overheat (seriously may cause the line to catch fire), which accelerat...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02M7/483
CPCH02J3/01H02M7/483H02M7/4835Y02E40/20
Inventor 高晗璎张鹏飞
Owner HARBIN UNIV OF SCI & TECH
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