Photovoltaic grid-connected inverter for active energy decoupling

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, ...

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 photovoltaic array (PV) from the output power of the grid-connected inverter, but the introduction of electrolytic capacitors not only increases the volume of the entire solar photovoltaic grid-connected power generation system, but also greatly shortens the The service life of the solar photovoltaic grid-connected power generation system reduces the reliability of the solar photovoltaic grid-connected power generation system

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