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Method and device for reducing harmonic distortion rate of output current and grid-connected converter

A technology of harmonic distortion rate and output current, applied in the field of grid-connected switches, can solve the problems of high output current distortion rate and reducing output current harmonic distortion rate, etc.

Pending Publication Date: 2021-03-19
GREE ELECTRIC APPLIANCES INC
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  • Application Information

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Problems solved by technology

[0003] Embodiments of the present invention provide a method, device, and grid-connected converter for reducing the harmonic distortion rate of the output current, so as to solve the problem of high output current distortion rate of the grid-connected converter in the prior art

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  • Method and device for reducing harmonic distortion rate of output current and grid-connected converter

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Embodiment Construction

[0032] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0033] Terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates otherwise, "multiple" Generally contain at least two.

[0034] It sho...

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Abstract

The invention discloses a method and device for reducing the harmonic distortion rate of output current and a grid-connected converter, the direct current side of the grid-connected converter comprises a voltage outer loop and a current inner loop, and the method comprises the following steps: obtaining an output signal of a PI controller arranged on the voltage outer loop; filtering a harmonic component in an output signal of the PI controller to obtain a reference signal of the current inner loop; and inputting the reference signal of the current inner loop into the current inner loop to obtain an output current. The output current harmonic distortion rate of the grid-connected converter can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of grid-connected converters, in particular to a method and device for reducing the harmonic distortion rate of output current and a grid-connected converter. Background technique [0002] The grid-connected converter is an important part of the distributed energy system and an important interface between the grid and photovoltaic and energy storage equipment. When the grid-connected converter works normally, there are mainly two working modes, which are off-grid and grid-connected modes. In off-grid mode, the grid neither generates nor absorbs energy and the converter is disconnected. In the grid-connected mode, the photovoltaic energy storage system can be divided into two situations: electricity consumption and grid feeding. In the grid-feeding condition, photovoltaic devices or energy storage devices feed back energy to the grid through converters. In the state of power consumption, the grid supplies ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/38H02J3/28H02M7/66
CPCH02J3/01H02J3/28H02J3/381H02M7/66H02J2300/20H02J2300/24Y02E10/56Y02E40/40
Inventor 陈慢林姜颖异黄猛黄颂儒郭泳颖党培育
Owner GREE ELECTRIC APPLIANCES INC
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