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
CN107834827BActive Publication Date: 2020-03-03GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENT CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG MIDEA WHITE HOME APPLIANCE TECH INNOVATION CENT CO LTD
Publication Date
2020-03-03

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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.
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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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