Integrated magnetics based interleaved flyback micropower grid-connected inverter

Abstract

The invention relates to an integrated magnetics based interleaved flyback micropower grid-connected inverter in a two-stage structure. The front stage is an interleaved flyback transform circuit adopting integrated magnetics, wherein interleaved flyback discrete transformers are integrated on one magnetic chip by means of magnetic integration technique. The rear stage is a low-frequency full-bridge inverter circuit, grid-connected current is controlled at the front stage, and power frequency inversion and grid connection are realized by the rear-stage circuit. The integrated magnetics based interleaved flyback micropower grid-connected inverter has the advantages of high power density, high efficiency, low grid-connected current distortion rate, easiness in development, low cost and the like, and is especially suitable for micropower grid-connected inverters.

Description

technical field [0001] The invention relates to an interleaved flyback micro-power grid-connected inverter based on integrated magnetic parts, which is especially suitable for use as an inverter in a micro-power photovoltaic grid-connected power generation system. Background technique [0002] Due to the characteristics of sustainable utilization and low environmental pollution, renewable energy has become an important part of my country's basic national policy of energy conservation and emission reduction. Among many renewable energy sources, solar energy is regarded as one of the ideal future alternative energy sources for mankind due to its advantages such as unlimited reserves, universality of existence, and cleanness of development and utilization. At present, the photovoltaic power generation system architecture mainly includes centralized (Centralized), string (String, including multi-string and single string), and AC module (AC Module). Among them, the centralized t...

AI Technical Summary

Problems solved by technology

Although soft switching technology can effectively reduce switching losses, it does not help reduce magnetic losses

and figure 1 In the circuit topology, the two transformers are independent, which not only has a larger volume, but also has a relatively large loss

In addition, because it is integrated with the solar panel and exposed to the sun, not only the working environment temperature is high, the temperature changes rapidly, but also the humidity is high, and it is sealed and packaged, so it is difficult to adopt air cooling, which brings great challenges to the thermal design of the inverter. , especially for the thermal design of magnetic parts with relatively large thermal resistance

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