Photovoltaic grid-connected inverter with active power decoupling function

A power decoupling and inverter technology, which is applied in the output power conversion device, the conversion of DC power input to DC power output, photovoltaic power generation, etc., can solve the problem of electrolytic capacitors being the bottleneck of the service life of the whole machine, and reduce the efficiency. loss, achieve electrical isolation, reduce the effect of output current harmonics

Active Publication Date: 2014-08-13
TBEA XIAN ELECTRIC TECH +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, a commonly used power decoupling method is to connect a large electrolytic capacitor in parallel on the DC input side o

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  • Photovoltaic grid-connected inverter with active power decoupling function
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  • Photovoltaic grid-connected inverter with active power decoupling function

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[0027] In order to enable those skilled in the art to better understand the technical solution of the present invention, the photovoltaic grid-connected inverter with active power decoupling function of the present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0028] The topological structure of the photovoltaic grid-connected inverter with active power decoupling function described in the present invention is as follows figure 1 As shown, it includes the main flyback converter 20, the power decoupling converter 10, the first stage filter capacitor C o , an inverter circuit 30 and an output filter circuit 40. The output voltage of the photovoltaic module passes through a DC side input capacitor C connected in parallel with the output terminal of the photovoltaic module in After that, they are respectively connected to the input end of the main flyback converter 20 and the input end of the power decoupling conv...

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Abstract

The invention discloses a photovoltaic grid-connected inverter with the active power decoupling function. The photovoltaic grid-connected inverter comprises a main flyback converter, a power decoupling converter, an inverter circuit and an output filter circuit. Decoupling between the output power of the photovoltaic grid-connected inverter and the output power of a photovoltaic module is achieved, the direct current voltage stabilization function of output of the photovoltaic module can be achieved by applying a non-electrolytic capacitor with small capacity to the direct current input side of the photovoltaic grid-connected inverter, and MPPT efficiency of the photovoltaic module is improved. An electrolytic capacitor is replaced by the non-electrolytic capacitor with high reliability, so that the problem that the overall service life of the photovoltaic grid-connected inverter is short due to use of the electrolytic capacitor is solved. Meanwhile, leakage inductance energy of a transformer can be absorbed and fed back, soft switching of a high-frequency operating switching tube of the main flyback converter is achieved, and conversion efficiency of the inverter is improved.

Description

technical field [0001] The invention relates to a photovoltaic grid-connected inverter, in particular to a photovoltaic grid-connected inverter with an active power decoupling function. Background technique [0002] Solar energy is inexhaustible and inexhaustible. In the 21st century when there is an urgent need for green energy, solar photovoltaic power generation will develop more rapidly. With the rapid development of distributed photovoltaic grid-connected applications and smart grids, the home roof and commercial roof markets are growing rapidly. In small and medium-sized photovoltaic grid-connected systems, the low-power photovoltaic grid-connected inverter that directly inverts the DC power output by a single photovoltaic module into AC power and injects it into the grid is called a photovoltaic grid-connected micro-inverter. Photovoltaic grid-connected micro-inverters are especially suitable for low-power applications. Micro-inverters can realize component-level mon...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M3/338
CPCY02E10/563Y02E10/56
Inventor 周洪伟张磊刘永奎
Owner TBEA XIAN ELECTRIC TECH
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