Three-phase grid-connected inverter system based on double resonant filter

A three-phase inverter and dual-resonance technology, which is applied in the direction of output power conversion devices and electrical components, can solve the problems of insignificant improvement of high-frequency harmonic filtering effect and large active power loss, and achieve enhanced high-frequency switching filtering Effect, reduce active power loss, reduce the effect of harmonic pollution

Active Publication Date: 2018-08-28
CEEC SHANXI ELECTRIC POWER EXPLORATION & DESIGN INST
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Problems solved by technology

[0003] The invention provides a three-phase grid-connected inverter system based on a double-resonant filter, which solves the technical problems of large active power loss and insignificant improvement of high-frequency harmonic filtering effect in the existing grid-connected inverter filter system

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  • Three-phase grid-connected inverter system based on double resonant filter
  • Three-phase grid-connected inverter system based on double resonant filter

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Embodiment Construction

[0017] The present invention is described in detail below in conjunction with accompanying drawing:

[0018] A three-phase grid-connected inverter system based on a double-resonant filter, including a DC power supply 1, a three-phase inverter 2, a three-phase double-resonant filter 4 and a three-phase AC grid 3, on the output of the DC power supply 1 There is a voltage stabilizing capacitor in parallel C dc , the output end of the DC power supply 1 is connected to the input end of the three-phase inverter 2, and the output end of the three-phase inverter 2 is connected to the three-phase AC power grid 3 through the three-phase double-resonant filter 4, and the three-phase Inverter side A-phase inductor of double resonant filter 4 L ia Connect with the A-phase output terminal of the three-phase inverter 2, and the A-phase grid-side inductor of the three-phase double-resonant filter 4 L ga Connect with the A-phase bus bar of the three-phase AC grid 3, and the B-phase induct...

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Abstract

The invention discloses a dual-resonance-filter based three-phase grid-connected inverter system, and solves the problems of high power consumption and unobvious filtering effect on high-frequency harmonics existing in the current grid-connected inversion filtering system. According to the dual-resonance-filter based three-phase grid-connected inverter system, the output end of a direct current power supply (1) is connected with the input end of a three-phase inverter (2); the output end of the three-phase inverter (2) is connected with a three-phase alternating current power grid (3) through the dual-resonance filter (4); the inverter side inductor of the three-phase dual-resonance filter (4) is connected with the output end of the single-phase inverter (2); the grid-side inductor of the three-phase dual-resonance filter (4) is connected with a single-phase alternating current power grid (3); and two groups of three-phase resonant branches which are connected in a start connection method are arranged on the connecting points of the inverter side inductor and the grid-side inductor of the three-phase dual-resonance filter (4). Harmonic pollution to the power grid when the distributed power supply is connected to the power grid is effectively reduced.

Description

technical field [0001] The invention relates to a grid-connected inverter system used when solar power generation is connected to the existing AC power grid, in particular to a grid-connected inverter system that can effectively filter out high-frequency switching harmonics generated by a three-phase grid-connected inverter Grid-connected inverter system. Background technique [0002] When the distributed DC power supply is connected to the existing three-phase grid, the three-phase grid-connected inverter is the main interface for connecting the distributed power supply to the grid and is an indispensable component. The three-phase grid-connected inverter converts direct current into three-phase alternating current through pulse width modulation. When the three-phase grid-connected inverter completes the pulse width modulation process, it will inevitably generate high-frequency switching harmonics of different frequencies. Severe high frequency harmonic pollution. High-f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/12
CPCH02M1/12
Inventor 王黎绚刘海龙高昂杨建勇申红强马国梁邹文斌
Owner CEEC SHANXI ELECTRIC POWER EXPLORATION & DESIGN INST
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