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Harmonic current compensation device for rectifier

A harmonic current and compensation device technology, applied in the field of harmonic current compensation, can solve problems such as high cost and increased production cost

Active Publication Date: 2020-03-03
GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the current harmonic content generated by the three-phase full-bridge rectification is low, the effect achieved is better, but the cost is high, and an additional control drive circuit needs to be added, which greatly increases the production cost

Method used

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  • Harmonic current compensation device for rectifier
  • Harmonic current compensation device for rectifier
  • Harmonic current compensation device for rectifier

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Embodiment Construction

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0023] A harmonic current compensation device for a rectifier according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0024] figure 1 It is a schematic block diagram of a harmonic current compensation device for a rectifier according to an embodiment of the present invention.

[0025] like figure 1 As shown, the harmonic current compensation device for a rectifier according to the embodiment of the present invention includes a harmonic injection circuit 10 , a f...

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Abstract

The present invention discloses a harmonic current compensation device used for a rectifier. The harmonic current compensation device comprises a harmonic injection circuit, and the harmonic injectioncircuit comprises a first filtering capacitor, a second filtering capacitor, a third filtering capacitor, a compensation filtering inductor, a first switching tube and a second switching tube. A first current detection module is used to detect a current flowing through the compensation filtering inductor, a second current detection module is used to detect a load current of the rectifier, a voltage detection module is used to detect the voltage of a three-phase power grid, and a control module is connected with the current detection modules, the voltage detection module, the control end of the first switching tube and the control end of the second switching tube separately and is used to generate a switch control signal according to the voltage of the three-phase power grid, the load current and the current flowing through the compensation filtering inductor and control the first and second switching tubes according to the switch control signal, thereby distributing a harmonic compensation current generated by the harmonic injection circuit to the three-phase power grid.

Description

technical field [0001] The invention relates to the technical field of harmonic current compensation, in particular to a harmonic current compensation device for a rectifier. Background technique [0002] Usually, the front stage of a three-phase AC power supply system in which the load is a motor uses a diode rectifier, and the latter stage uses a three-phase full-bridge inverter. The rectifier can rectify the three-phase alternating current to direct current, and filter it by the alternating current inductor and the direct current capacitor. However, the topological structure of the above-mentioned three-phase AC power supply system can provide a stable DC power for the load when the DC capacitance is large, but it will generate relatively large harmonic currents on the AC side. At present, the standards applicable to the harmonic current of the three-phase rectifier include: EN61000-3-2 (current less than 16A), IEEE519, etc. These standards have made specific provisions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 曹亮
Owner GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENT CO LTD
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