Single-stage photovoltaic grid-connected inverter based on power decoupling

Abstract

The invention discloses a single-stage photovoltaic grid-connected inverter based on power decoupling. The single-stage photovoltaic grid-connected inverter comprises a booster circuit, an auxiliary circuit, a flyback inverter, a filter circuit and a power grid module. Compared with a traditional photovoltaic grid-connected inverter, the topological structure of the single-stage photovoltaic grid-connected inverter based on power decoupling carries out power decoupling by adding the auxiliary circuit, so that the difference between instantaneous alternating current output power and direct current input power can be balanced, current ripples at the input end of the inverter can be effectively inhibited, the conversion efficiency of the photovoltaic grid-connected inverter can be improved; a center tap isolation transformer is adopted, so that the single-stage photovoltaic grid-connected inverter based on power decoupling has high voltage gain and voltage regulation rate, is small in size, ensures reliability and economical efficiency, and has a wide application range.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to a single-stage photovoltaic grid-connected inverter based on power decoupling. Background technique [0002] With the increasing depletion of traditional fossil energy, a series of problems such as global warming and environmental pollution have followed. Energy issues have become a severe challenge to the development of countries all over the world. Therefore, people continue to explore and research new energy sources, such as photovoltaic power generation, wind power generation and tidal power generation. The "14th Five-Year Plan" pointed out that my country will promote the energy revolution, adhere to the simultaneous development of centralized and distributed, vigorously increase the scale of wind power and photovoltaic power generation, and build a number of multi-energy complementary clean energy bases. Among them, photovoltaic power generation is th...

AI Technical Summary

Problems solved by technology

However, for distributed single-stage photovoltaic grid-connected inverters, there are often a large number of power fluctuations at twice the grid frequency on the output side, resulting in ripple components at the output of photovoltaic modules and reducing the average power generation of photovoltaic modules. Therefore, we Need to improve the efficiency of photovoltaic grid-connected inverters, and ensure small size, reliability and economy

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