Single-phase three-level micro photovoltaic inverter and open-loop control method and system thereof

Abstract

The invention discloses a single-phase three-level micro photovoltaic inverter and an open-loop control method and system thereof, and the inverter consists of a filtering and follow current inductor,a capacitor, a plurality of clamping diodes and a switching device, can enable the DC voltage of a DC side photovoltaic panel to be well inverted into an AC voltage meeting the grid-connected demands, and achieves the grid-connected control of electric energy. Furthermore, the open-loop control method simply and effectively enables the inverter to realize inversion control of the direct current of the photovoltaic panel and output sine alternating current capable of meeting the grid-connected requirement, and the method is simple in step, easy to realize and suitable for large-scale popularization and application.

Description

technical field [0001] The invention relates to the field of drive and control of power electronic inverters, in particular to a single-phase three-level micro-photovoltaic inverter and its open-loop control method and system. Background technique [0002] With the rapid development of economic level and industrial technology all over the world, the demand for energy is also increasing. And with the development of science and technology, as well as the non-renewability of traditional energy and the irreversible damage to the environment caused by unrestricted exploitation of traditional energy, people are increasingly inclined to use a clean and renewable new energy to replace traditional energy. There are many types of renewable energy, including wind energy, water energy, geothermal energy, solar energy, etc. Among them, solar energy is the most easily discovered and utilized renewable energy. In recent years, since people pay more and more attention to the use of solar e...

AI Technical Summary

Problems solved by technology

The traditional photovoltaic inverter system uses multiple photovoltaic panels in series to share an inverter. Therefore, the volume and power of the inverter are large, and it is accompanied by a large power loss and serious heating.

In addition, due to the series connection of multiple photovoltaic panels, when one of the photovoltaic panels fails or is blocked by shadows and cannot work normally, the series of photovoltaic panels will not work normally, reducing the efficiency of photovoltaic power generation.

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