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Single-phase grid-connected inverter system based on double harmonic filter

A technology of inverter system and single-phase inverter, which is applied in the direction of harmonic reduction device, single-network parallel feeding arrangement, AC network to reduce harmonic/ripple, etc., can solve the problem of improving the effect of high-frequency harmonic filtering Obvious, large active power loss and other problems, to achieve the effect of strengthening the high-frequency switching filter effect, reducing active power loss, and reducing harmonic pollution

Active Publication Date: 2016-09-07
CEEC SHANXI ELECTRIC POWER EXPLORATION & DESIGN INST
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Problems solved by technology

[0003] The invention provides a single-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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Embodiment Construction

[0011] The present invention is described in detail below in conjunction with accompanying drawing:

[0012] A single-phase grid-connected inverter system based on a double-resonant filter, including a DC power supply 1, a single-phase inverter 2, a single-phase double-resonant filter 4 and an AC power grid 3, and the output terminal of the DC power supply 1 is connected in parallel with Stabilizer capacitor C dc , the output end of the DC power supply 1 is connected to the input end of the single-phase inverter 2, and the output end of the single-phase inverter 2 is connected to the single-phase AC power grid 3 through the single-phase double-resonant filter 4, and the single-phase Inverter side inductor for double resonant filter 4 L i Connected with the output terminal of the single-phase inverter 2, the grid-side inductor of the single-phase double-resonant filter 4 L g connected together with the AC grid 3, the inductor on the inverter side of the single-phase double...

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Abstract

The invention discloses a single-phase grid-connected inverter system based on a double harmonic filter. The single-phase grid-connected inverter system solves the problems that the active loss is great and the promotion of high-frequency harmonic filter effect is not obvious existing in an existing grid-connected inverter filter system. The single-phase grid-connected inverter system comprises a direct-current power supply (1), a single-phase inverter (2), a double harmonic filter (4) and a single-phase alternating-current power grid (3), wherein the output end of the direct-current power supply (1) is connected with the input end of the single-phase inverter (2); the output end of the single-phase inverter (2) is connected with the single-phase alternating-current power grid (3) through the double harmonic filter (4); an inverter side inductor (Li) of the single-phase double harmonic filter (4) is connected with the output end of the single-phase inverter (2); a grid side inductor (Lg) of the single-phase double harmonic filter (4) is connected with the single-phase alternating-current power grid (3); and a first resonance circuit and a second resonance circuit are connected between the connection point of the inverter side inductor (Li) of the single-phase double harmonic filter (4) and the grid side inductor (Lg) of the single-phase double harmonic filter (4) and the ground in parallel. The harmonic pollution to the power grid when a distributed power supply is connected into 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 single-phase grid-connected inverters Grid-connected inverter system. Background technique [0002] When the distributed DC power supply is connected to the existing power grid, the single-phase grid-connected inverter is an indispensable component as the main interface for connecting the distributed power supply to the grid. The single-phase grid-connected inverter converts direct current into single-phase alternating current through pulse width modulation. When the single-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-frequen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/38
CPCH02J3/01H02J3/381Y02E40/40
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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