Photovoltaic grid-connected inverter for active energy decoupling

A technology of energy decoupling and inverter, applied in photovoltaic power generation, output power conversion device, AC power input conversion to DC power output, etc., can solve the problem of shortening the service life of solar photovoltaic grid-connected power generation systems, increasing solar photovoltaic and The size of the grid power generation system, reducing the reliability of the solar photovoltaic grid-connected power generation system, etc., to achieve the effect of improving the life and reliability of the system, reducing the volume, and reducing the peak power

Inactive Publication Date: 2010-09-22
盈威力新能源科技(上海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the solar photovoltaic grid-connected power generation system, the output power of the solar photovoltaic array (PV) is smooth DC, while the output power of the grid-connected inverter presents periodic pulsation characteristics, so a parallel connection is required on the DC input side of the grid-connected inverter. Large electrolytic capacitors are used to decouple the output power of the solar photovolt

Method used

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  • Photovoltaic grid-connected inverter for active energy decoupling
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Examples

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Embodiment 1

[0037] like figure 1 As shown, the active energy decoupling photovoltaic grid-connected inverter of the present invention includes a first flyback converter 10, a second flyback converter 20, a voltage regulation converter 30, an output filter circuit 40 and an inverter circuit 50; output voltage u of solar photovoltaic array PV PV Through a parallel connection in the solar photovoltaic array PV output voltage u PV on the input filter capacitor C in Connect with the input end of the first flyback converter 10 and the input end of the second flyback converter 20 respectively, the output end of the second flyback converter 20 is connected in parallel on the output end of the second flyback converter 20 through a The decoupling capacitor C D Connected to the input end of the voltage regulating converter 30, the output end of the first flyback converter 10 is connected to the output end of the voltage regulating converter 30 and connected to the input end of the output filter c...

Embodiment 2

[0056] like Image 6 As shown, the same as Embodiment 1, the active energy decoupling photovoltaic grid-connected inverter of the present invention includes a first flyback converter 10, a second flyback converter 20, a voltage regulating converter 30, an output filter Circuit 40 and inverter circuit 50; the output voltage u of solar photovoltaic array PV PV Through a parallel connection in the solar photovoltaic array PV output voltage u PV on the input filter capacitor C in Connect with the input end of the first flyback converter 10 and the input end of the second flyback converter 20 respectively, the output end of the second flyback converter 20 is connected in parallel on the output end of the second flyback converter 20 through a The decoupling capacitor C D Connected to the input end of the voltage regulating converter 30, the output end of the first flyback converter 10 is connected to the output end of the voltage regulating converter 30 and connected to the input...

Embodiment 3

[0061] like Figure 7 As shown, the same as Embodiment 1, the active energy decoupling photovoltaic grid-connected inverter of the present invention includes a first flyback converter 10, a second flyback converter 20, a voltage regulating converter 30, an output filter Circuit 40 and inverter circuit 50; the output voltage u of solar photovoltaic array PV PV Through a parallel connection in the solar photovoltaic array PV output voltage u PV on the input filter capacitor C in Connect with the input end of the first flyback converter 10 and the input end of the second flyback converter 20 respectively, the output end of the second flyback converter 20 is connected in parallel on the output end of the second flyback converter 20 through a The decoupling capacitor C D Connected to the input end of the voltage regulating converter 30, the output end of the first flyback converter 10 is connected to the output end of the voltage regulating converter 30 and connected to the inpu...

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Abstract

The invention aims to disclose a photovoltaic grid-connected inverter for active energy decoupling, which comprises a first flyback converter, a second flyback converter, a voltage regulating converter, an output filter circuit and an inverter circuit. The decoupling of the output power of the photovoltaic grid-connected inverter and the output power of a solar photovoltaic array is realized, pulsation of the output power of the solar photovoltaic array is greatly reduced, the fluctuation loss caused by maximum power point tracking (MPPT) is reduced, and the conversion efficiency of the photovoltaic array is improved; only a non-electrolyte capacitor with small capacity and high reliability is adopted, the defects that the service life of the photovoltaic grid-connected inverter is shortened and the reliability is reduced caused by adopting an electrolytic capacitor are overcome, the service life and the reliability of the photovoltaic grid-connected inverter are improved; and the peak power of a transformer in the flyback converter is reduced, the volume of the transformer is reduced, the loss is effectively reduced, and the conversion efficiency is improved, so that the aim of the invention is realized.

Description

technical field [0001] The present invention relates to a solar photovoltaic grid-connected inverter, in particular to the technical field of solar photovoltaic grid-connected power generation, which only needs to use small-capacity non-electrolytic capacitors to realize power decoupling and active energy decoupling photovoltaic grid-connected inverters device. Background technique [0002] As a non-polluting, renewable new energy source, solar energy has very broad application and development prospects. With the development of society and economy, using solar energy to generate electricity has become a reliable way to solve the problems of production and living energy and improve environmental pollution. It can achieve huge Economic and social benefits, solar energy has become the most important renewable energy after water power and wind power in our country. [0003] Photovoltaic grid-connected inverter is the bridge connecting the solar photovoltaic array and the grid, ...

Claims

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Application Information

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IPC IPC(8): H02M7/501
CPCY02E10/56
Inventor 古俊银吴红飞
Owner 盈威力新能源科技(上海)有限公司
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