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A method for suppressing neutral current of a three-phase four-wire grid-connected inverter

A three-phase four-wire system and current suppression technology, which is applied to AC network circuits, AC power input conversion to DC power output, electrical components, etc., can solve noise interference, large high-order harmonic components, and affect the normal use of equipment, etc. problem, to achieve the effect of suppressing the neutral current

Active Publication Date: 2021-02-05
TIANJIN UNIV
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  • Application Information

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Problems solved by technology

However, when the split capacitor is used as the fourth bridge arm, the neutral line current is large, which will reduce the service life of the DC side capacitor, and the high-order harmonic component in the neutral line current is large, causing noise interference, which affects the normal use of the equipment

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  • A method for suppressing neutral current of a three-phase four-wire grid-connected inverter
  • A method for suppressing neutral current of a three-phase four-wire grid-connected inverter
  • A method for suppressing neutral current of a three-phase four-wire grid-connected inverter

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Embodiment Construction

[0029] The specific implementation of the three-phase four-wire interphase carrier phase shifting of the present invention will be described below with reference to the accompanying drawings, so that those skilled in the art can better understand the present invention.

[0030] figure 1 It is a circuit diagram of a specific embodiment of the present invention. Such as figure 1 As shown, the three-phase four-wire grid-connected inverter adopts the three-phase full-bridge topology as the inverter circuit, and each full-bridge consists of six power switch tubes, which are IGBTs (Insulated Gate Switches) with reverse diodes in this embodiment. Bipolar Transistor, insulated gate bipolar transistor), the AC output filter circuit adopts LLCCL filter circuit structure, and then the filter is connected to the grid, and the neutral inductance on the grid side represents the leakage inductance of the transformer.

[0031] The present invention is a method for suppressing neutral line c...

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Abstract

The invention discloses a neutral line current suppression method of a three-phase four-wire grid-connected inverter. The circuit includes an inverter unit and an AC output filter circuit connected to the AC side of the inverter unit. The AC output filter circuit adopts a filter circuit structure of LLCCL . Two large capacitors are connected in series and parallel on the side of the DC bus, and the middle point is used as the N line. The control method is as follows: directly control the output current of the inverter, and take the A-phase carrier as a reference, and sequentially shift the phases of the B and C-phase carriers by 2π / 3, 4π / 3, which can effectively suppress the high-frequency component of the neutral current, and the power grid The current can reach the grid-connected standard. The control method is simple and has high practical value.

Description

technical field [0001] The invention relates to the field of three-phase four-wire grid-connected inverters, in particular to a method for suppressing neutral line current of a three-phase four-wire inverter based on interphase carrier phase shift. Background technique [0002] At present, the new energy grid-connected technology has been widely used, and the three-phase four-wire grid-connected inverter, as a key part of the grid-connected power generation system, has also been greatly developed. However, when the split capacitor is used as the fourth bridge arm, the neutral line current is large, which will reduce the service life of the DC side capacitor, and the high-order harmonic component in the neutral line current is large, causing noise interference, which affects the normal use of the equipment. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for suppressing the neutral...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02M1/12H02J3/38
CPCH02J3/382H02M1/12H02M7/5387
Inventor 何晋伟刘宇
Owner TIANJIN UNIV
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